{"id":5239,"date":"2026-09-07T10:53:28","date_gmt":"2026-09-07T02:53:28","guid":{"rendered":"https:\/\/ballvalves.tw\/?p=5239"},"modified":"2026-10-08T09:29:07","modified_gmt":"2026-10-08T01:29:07","slug":"swing-check-valve-vs-spring-check-valve","status":"publish","type":"post","link":"https:\/\/ballvalves.tw\/es\/swing-check-valve-vs-spring-check-valve\/","title":{"rendered":"Swing Check Valve vs Spring Check Valve: Flow, Orientation, Shutdown, Materials and Fit"},"content":{"rendered":"<p class=\"wp-block-paragraph\">A swing check valve is the better default for a horizontal line with steady flow and a tight pressure-drop budget. A spring check valve is the better default for a pump that stops often, for a vertical run and for a tight space, because its spring closes it before flow reverses. Which one fits your line comes down to five factors: flow range, orientation, shutdown, fluid and connections.<\/p>\n<p class=\"wp-block-paragraph\">Each factor below comes with the numbers behind it: why a half-open disc wears itself out, how much surge a slamming valve can create, how to turn a Cv value (a valve&#8217;s flow coefficient) into pressure drop, and why a PT thread (the taper thread common on Asian-made valves) and an NPT thread (the American one) of the same size should never be joined. We are YZNG TRONG, a stainless steel valve manufacturer in Taiwan that makes both types, so the later sections map each situation to a real model and list what to put in a request for quote (RFQ).<\/p>\n<p class=\"wp-block-paragraph\"><strong>Puntos clave<\/strong><\/p>\n<ul class=\"wp-block-list\">\n<li>A swing check valve has the lower pressure drop of the two once its disc is fully open, but it needs enough flow to get there. It works in horizontal lines or vertical lines with upward flow.<\/li>\n<li>A spring check valve closes quickly over a short stroke, which reduces slam when a pump stops. The price is extra pressure drop, because the spring sits in the flow.<\/li>\n<li>Every 1 psi lost across a valve is about 2.31 feet of head your pump has to make up.<\/li>\n<li>Stopping reverse flow suddenly in steel pipe creates a surge of roughly 60 psi for every 1 ft\/s of velocity stopped. Closing before reverse flow builds is the main advantage of a spring check valve.<\/li>\n<li>Match the spring material to the body material, and never join PT and NPT threads.<\/li>\n<\/ul>\n<h2 class=\"wp-block-heading\">Swing vs spring check valve at a glance<\/h2>\n<p class=\"wp-block-paragraph\">The two designs trade pressure drop against closing speed. A swing check valve gives the freer flow path, and a spring check valve gives the faster, more predictable closure. The table sets out how they differ on the points buyers compare most often.<\/p>\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<thead>\n<tr>\n<th>Factor<\/th>\n<th>Swing check valve<\/th>\n<th>Spring check valve<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>How it closes<\/td>\n<td>Gravity and reverse flow swing a hinged disc back onto the seat<\/td>\n<td>A spring pushes a piston, poppet or disc back onto the seat<\/td>\n<\/tr>\n<tr>\n<td>Pressure drop at full flow<\/td>\n<td>Low, because the disc swings clear of the bore<\/td>\n<td>Higher, because the spring and poppet stay in the flow path<\/td>\n<\/tr>\n<tr>\n<td>Flow needed to open fully<\/td>\n<td>Enough velocity to hold the disc against its stop<\/td>\n<td>Set by the spring; check the cracking pressure and full-open flow<\/td>\n<\/tr>\n<tr>\n<td>Closing when the pump stops<\/td>\n<td>Slower, because the disc travels a long arc<\/td>\n<td>Faster, because the stroke is short and the spring starts closing early<\/td>\n<\/tr>\n<tr>\n<td>Slam and noise risk<\/td>\n<td>Higher on lines that decelerate quickly<\/td>\n<td>Lower on the same lines<\/td>\n<\/tr>\n<tr>\n<td>Orientation<\/td>\n<td>Horizontal, or vertical with upward flow<\/td>\n<td>Horizontal or vertical; downward flow only if the model is rated for it<\/td>\n<\/tr>\n<tr>\n<td>Space<\/td>\n<td>Longer body with a cap or bonnet over the disc<\/td>\n<td>Short, compact inline body<\/td>\n<\/tr>\n<tr>\n<td>Debris<\/td>\n<td>Open bore, but debris can catch on the hinge<\/td>\n<td>Narrower passages; a strainer upstream helps<\/td>\n<\/tr>\n<tr>\n<td>Typical lines<\/td>\n<td>Steady-flow utility water, cooling water, horizontal discharge lines<\/td>\n<td>Pump discharge with frequent stops, booster sets, vertical risers, equipment skids<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h2 class=\"wp-block-heading\">What is the difference between a swing check valve and a spring check valve?<\/h2>\n<p class=\"wp-block-paragraph\">Both are check valves: automatic valves that let fluid pass in one direction and close when it tries to reverse. The difference is what closes them. A swing check valve relies on gravity and reverse flow to swing a hinged disc back onto its seat. A spring check valve uses a spring, so it starts closing as soon as forward flow weakens.<\/p>\n<h3 class=\"wp-block-heading\">How a swing check valve works<\/h3>\n<p class=\"wp-block-paragraph\">Inside a swing check valve, a disc hangs from a hinge pin near the top of the body. Forward flow pushes the disc up and out of the way until it rests against a stop, leaving an almost straight path through the valve. When flow slows, the disc starts to fall back. When flow reverses, the returning fluid pushes it the rest of the way onto the seat. No power or operator is involved. Because gravity does part of the closing work, the valve has to sit where gravity can pull the disc toward the seat. That is why orientation matters so much for this design.<\/p>\n<h3 class=\"wp-block-heading\">How a spring check valve works<\/h3>\n<p class=\"wp-block-paragraph\">A spring check valve, often sold as an inline check valve, silent check valve or non-slam check valve, holds a piston, poppet or disc against its seat with a spring. Forward flow has to build enough differential pressure to compress the spring before anything passes. That threshold is the cracking pressure. As flow falls away, the spring pushes the closing element back over a short distance, so the valve is usually shut by the time flow would have reversed.<\/p>\n<p class=\"wp-block-paragraph\">The names overlap across the industry. Some swing check valves add a spring or an outside lever and weight, and dual-plate wafer check valves also use springs. This guide compares an unassisted swing check valve with an inline spring check valve, the two designs most buyers mean when they ask which to choose.<\/p>\n<h3 class=\"wp-block-heading\">Five terms to define before you compare<\/h3>\n<ul class=\"wp-block-list\">\n<li><strong>Cracking pressure<\/strong> is the differential pressure at which a closed check valve first starts to pass flow.<\/li>\n<li><strong>Full-open flow<\/strong> is the flow, or velocity, needed to hold the disc fully open against its stop.<\/li>\n<li><strong>Ca\u00edda de presi\u00f3n<\/strong> is the pressure lost across the valve at a given flow.<\/li>\n<li><strong>Flow coefficient (Cv)<\/strong> is the flow of 60 \u00b0F water, in US gallons per minute, that passes through a valve with a pressure drop of 1 psi. A higher Cv means less resistance. The metric version, Kv, is the flow in cubic meters per hour at a 1 bar drop, and Kv is about 0.865 times Cv.<\/li>\n<li><strong>Check valve slam<\/strong> is the bang heard when a valve closes on reverse flow that is already moving and stops it suddenly.<\/li>\n<\/ul>\n<h2 class=\"wp-block-heading\">Factor 1: Flow range and pressure drop<\/h2>\n<p class=\"wp-block-paragraph\">Size a check valve to the flow it will actually carry, not to the pipe it connects to. A swing check valve passes flow with the least resistance once its disc is fully open, but it needs enough velocity to get there. A spring check valve costs more pressure drop at full flow, and in return its spring keeps the closing element stable and quick to respond.<\/p>\n<h3 class=\"wp-block-heading\">Why a half-open disc is a problem<\/h3>\n<p class=\"wp-block-paragraph\">Below its full-open velocity, a swing disc does not rest on its stop. It floats in the stream, pushed up by the flow and pulled down by gravity, and turbulence keeps shifting the balance between them. The disc rocks, taps the stop or the seat, and wears the hinge pin, the disc arm and the seat face. Noise comes first, then leakage, and in the worst case broken internals. The usual cause is a valve that is too large for the flow: picked one size up &#8220;for lower pressure drop&#8221;, or sized for a peak flow the line rarely sees. Variable-speed pumps and night-time demand make it more likely, because the line spends hours below its design flow.<\/p>\n<p class=\"wp-block-paragraph\">A spring check valve is less prone to this, because the spring presses the closing element toward the seat at every opening. It can still chatter when flow sits just above the cracking point. The fix is the same for both types: size the valve against the lowest flow your system really runs at as well as the highest, and put both figures in your inquiry.<\/p>\n<h3 class=\"wp-block-heading\">Cracking pressure versus the head you actually have<\/h3>\n<p class=\"wp-block-paragraph\">One psi equals about 2.31 feet (0.70 m) of water. A spring check valve that needs 1 psi to crack open therefore needs the equivalent of 2.3 feet of water pushing on it before any flow passes. On a pumped line that is negligible. On a gravity drain, a tank overflow, a low-head transfer line or a passive solar water loop that circulates by natural convection, it can be enough to stop flow altogether. A swing check valve usually opens with less differential pressure, which is one reason it remains common on low-head lines.<\/p>\n<p class=\"wp-block-paragraph\">Vertical downward flow raises a second question. In a down-flow line, gravity pulls the closing element away from the seat instead of toward it. The spring has to overcome the weight of the poppet or disc to close the valve at all. If the line must not drain when the pump is off, the cracking pressure also has to exceed the water column above the valve. That is why down-flow approval depends on the exact model and the spring fitted.<\/p>\n<h3 class=\"wp-block-heading\">Turning a Cv value into pressure drop<\/h3>\n<p class=\"wp-block-paragraph\">For water and other liquids, the standard Cv relation gives the pressure drop directly:<\/p>\n<p class=\"wp-block-paragraph\"><strong>Pressure drop (psi) = specific gravity \u00d7 (flow in US gpm \u00f7 Cv)\u00b2<\/strong><\/p>\n<p class=\"wp-block-paragraph\">Take a line carrying 30 US gpm of water (about 6.8 m\u00b3\/h) and two candidate valves with Cv values of 30 and 18. These are example values for the arithmetic, not data for any particular product. The first valve drops (30 \u00f7 30)\u00b2 = 1.0 psi. The second drops (30 \u00f7 18)\u00b2 = 2.8 psi. The difference, 1.8 psi, is about 4.1 feet of head that the pump has to supply for as long as it runs.<\/p>\n<p class=\"wp-block-paragraph\">Two cautions apply. A published Cv describes the valve fully open, and at partial opening a swing check valve behaves differently, so the figure no longer holds. A Cv figure also belongs to one size and, for a spring check valve, one spring. In metric units the same relation reads: pressure drop (bar) = specific gravity \u00d7 (flow in m\u00b3\/h \u00f7 Kv)\u00b2.<\/p>\n<h2 class=\"wp-block-heading\">Factor 2: Installation orientation<\/h2>\n<p class=\"wp-block-paragraph\">A swing check valve works in a horizontal line or a vertical line with upward flow, because gravity is part of its closing force. It does not work in a vertical line with downward flow. A spring check valve does not depend on gravity, so it suits vertical runs better, but every model has a permitted orientation set by its spring, and downward flow needs the most care.<\/p>\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<thead>\n<tr>\n<th>Orientation<\/th>\n<th>Swing check valve<\/th>\n<th>Spring check valve<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Horizontal line<\/td>\n<td>Yes, with the cap or bonnet facing up<\/td>\n<td>S\u00ed<\/td>\n<\/tr>\n<tr>\n<td>Vertical line, upward flow<\/td>\n<td>S\u00ed<\/td>\n<td>S\u00ed<\/td>\n<\/tr>\n<tr>\n<td>Vertical line, downward flow<\/td>\n<td>No: gravity holds the disc away from the seat<\/td>\n<td>Only if the model and spring are rated for it<\/td>\n<\/tr>\n<tr>\n<td>Inclined line<\/td>\n<td>Only within the angle the manufacturer allows<\/td>\n<td>Follow the model&#8217;s instructions<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<p class=\"wp-block-paragraph\">In every orientation, the arrow marked on the body has to point in the direction of flow. Our SC threaded swing check valve is specified for horizontal lines, most commonly with the cap facing up, or for vertical lines with upward flow. Our SC-1 spring check valve suits horizontal lines and vertical lines with upward flow; ask us before using it in downward flow.<\/p>\n<p class=\"wp-block-paragraph\">Position along the line matters as well. A check valve placed directly after a pump outlet, an elbow or a reducer sees uneven, swirling flow, and a swing disc in that flow is more likely to flutter. Leave a straight run of pipe between the disturbance and the valve, so the flow has settled by the time it reaches the disc.<\/p>\n<h2 class=\"wp-block-heading\">Factor 3: What happens when the pump stops<\/h2>\n<p class=\"wp-block-paragraph\">When a pump stops, the water in the discharge line slows down and then starts to run backward. A check valve that is still open at that moment is slammed shut by the reverse flow, and the sudden stop sends a pressure surge through the pipe. A spring check valve closes faster, because its stroke is short and the spring starts closing it before flow reverses.<\/p>\n<h3 class=\"wp-block-heading\">How big a slam surge can get<\/h3>\n<p class=\"wp-block-paragraph\">The size of the surge follows the Joukowsky equation: pressure rise equals fluid density times the pressure wave speed in the pipe times the change in velocity. <a href=\"https:\/\/web.eng.fiu.edu\/arleon\/courses\/Transient_flows\/Lectures\/Waterhammer.pdf\" target=\"_blank\" rel=\"noopener\">Florida International University&#8217;s course notes on water hammer<\/a> give the inputs for water: a density of 1,000 kg\/m\u00b3 and a bulk modulus of 2.1 \u00d7 10\u2079 N\/m\u00b2, which puts the wave speed near 1,450 m\/s in a perfectly rigid pipe. Real steel pipe stretches slightly and lowers that figure. Worked through, the result is a surge of roughly 60 psi (about 4 bar) for every 1 ft\/s (0.3 m\/s) of flow that is stopped instantly.<\/p>\n<p class=\"wp-block-paragraph\">The same rate shows why closing early matters. A valve that shuts when reverse flow has reached 0.2 ft\/s creates a spike of about 12 psi. A swing check valve that is still open when the water has reached 2 ft\/s backward can send a spike of around 120 psi above the pressure in the line at that instant. For the wider picture of causes and fixes, see our guide to <a href=\"https:\/\/ballvalves.tw\/es\/golpes-de-ariete-en-edificios-de-gran-altura\/\">golpes de ariete en edificios de gran altura<\/a>.<\/p>\n<h3 class=\"wp-block-heading\">What field measurements show<\/h3>\n<p class=\"wp-block-paragraph\">At the Tibidabo pumping station in Barcelona, engineers measured surge pressure on a 12-inch (300 mm) line after deliberate pump trips. In <a href=\"https:\/\/www.pumps.org\/2024\/12\/12\/field-evaluation-of-different-check-valve-designs-and-surge-pressure-measurement-in-a-municipal-water-pumping-station\/\" target=\"_blank\" rel=\"noopener\">the field study summarized by the Hydraulic Institute<\/a>, a nozzle check valve reduced the surge spike after valve slam by more than 80% compared with a conventional swing check valve. Most nozzle check valves are short-stroke designs that close with spring assistance, so they sit on the same side of this comparison as an inline spring check valve. One station is not every system, but the direction of the result matches the physics above.<\/p>\n<h3 class=\"wp-block-heading\">When a swing check valve is still the right call<\/h3>\n<p class=\"wp-block-paragraph\">Slam depends on how fast the water decelerates after the pump stops, and that depends on the system: pump inertia, the mass of water in the line, friction and the static head the pump works against. A large pump lifting water a short height into a tank often slows gently, and a swing check valve closes in time. Lines with high static head, small low-inertia pumps or several pumps sharing one header reverse fast, and those are the lines where a spring check valve earns its extra pressure drop. If an existing swing check valve bangs every time the pump stops, your line is in the second group.<\/p>\n<h3 class=\"wp-block-heading\">Where spring closure helps, and where you need more<\/h3>\n<p class=\"wp-block-paragraph\">A spring check valve targets one cause of water hammer: slam at the check valve after a pump stops. Surges from other sources, such as a fast-closing valve elsewhere in the line, trapped air or the water column separating at a high point, need their own measures, from slower valve operation to surge vessels. If you are replacing a check valve because of a bang, first confirm that the bang happens when the check valve closes.<\/p>\n<h2 class=\"wp-block-heading\">Factor 4: Fluid, temperature and materials, including the spring<\/h2>\n<p class=\"wp-block-paragraph\">Pick the body material for the fluid, then make sure the spring and internals match it. For stainless check valves the usual choice is CF8, the cast form of 304, for clean water and mild service, and CF8M, the cast form of 316, where chlorides are present. Temperature limits come from the softest part of the valve, and solids call for a strainer upstream.<\/p>\n<h3 class=\"wp-block-heading\">Choosing the body material<\/h3>\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<thead>\n<tr>\n<th>Material<\/th>\n<th>Typical fit<\/th>\n<th>What to check<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Bronze or brass<\/td>\n<td>Small plumbing and heating, ventilation and air-conditioning (HVAC) lines<\/td>\n<td>Dezincification resistance in aggressive water; local drinking-water rules<\/td>\n<\/tr>\n<tr>\n<td>PVC or CPVC<\/td>\n<td>Low-pressure corrosive water and chemical dosing at moderate temperature<\/td>\n<td>The pressure rating falls as temperature rises<\/td>\n<\/tr>\n<tr>\n<td>Cast or ductile iron<\/td>\n<td>Large waterworks and wastewater swing check valves, usually flanged<\/td>\n<td>Internal coating or lining; corrosion at the seat<\/td>\n<\/tr>\n<tr>\n<td>CF8 (cast 304 stainless)<\/td>\n<td>Clean water, air, oils and many mild chemicals<\/td>\n<td>Chloride content of the fluid<\/td>\n<\/tr>\n<tr>\n<td>CF8M (cast 316 stainless)<\/td>\n<td>Chloride-bearing water, coastal and marine service, many chemical lines<\/td>\n<td>Concentration and temperature of aggressive chemicals; warm or stagnant seawater<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<p class=\"wp-block-paragraph\">The step from CF8 to CF8M is driven by chlorides, not by &#8220;acid&#8221; in general. The molybdenum in CF8M improves resistance to chloride pitting, which is the failure that matters in seawater, brackish water and many process streams. Our <a href=\"https:\/\/ballvalves.tw\/es\/cf8m-material\/\">guide to CF8M material<\/a> covers the composition and equivalent grades in more detail.<\/p>\n<h3 class=\"wp-block-heading\">The spring is part of the material specification<\/h3>\n<p class=\"wp-block-paragraph\">The spring is the thinnest, most highly stressed part of a spring check valve, and it sits in the flow. If it corrodes or fatigues, it loses force, and the valve closes slowly or seals poorly long before the body shows any damage. A CF8M body with a 304 spring can leave the spring as the weak point in chloride service. Ask which spring grade is fitted, and match it to the body grade. Our SC-1 is built that way: a CF8 body with an SS304 spring is in stock, and a CF8M version with an SS316 spring is made to order.<\/p>\n<p class=\"wp-block-paragraph\">Spring force is a trade-off as well. A stronger spring closes faster and suits vertical down-flow, but it raises the cracking pressure and the pressure drop. A lighter spring opens more easily and costs less head, but closes more slowly. On a low-head line, a swing check valve or a light spring is the safer choice.<\/p>\n<h3 class=\"wp-block-heading\">Solids, fibers and viscous fluids<\/h3>\n<p class=\"wp-block-paragraph\">A swing check valve has an open bore, but rags, fibers and scale can still catch on the hinge or hold the disc off its seat. An inline spring check valve has narrower passages and is less tolerant of debris. In both cases a strainer protects the valve. On a pump, a common layout is a <a href=\"https:\/\/ballvalves.tw\/es\/producto\/filtro-tipo-y-800-wog\/\">stainless steel Y strainer<\/a> on the suction side and the check valve on the discharge side, and our <a href=\"https:\/\/ballvalves.tw\/es\/tabla-de-correspondencias-entre-el-tamano-de-malla-de-los-filtros-y-las-micras\/\">Y strainer mesh size to micron chart<\/a> helps you choose the screen. Viscous fluids need more force to open a check valve and slow its closing, so give the supplier the viscosity at operating temperature.<\/p>\n<h3 class=\"wp-block-heading\">Temperatura<\/h3>\n<p class=\"wp-block-paragraph\">A check valve&#8217;s temperature limit is set by its weakest component, which is usually the seat, the gasket or the spring rather than the cast body. Springs can relax at high temperature and lose closing force. For hot water, thermal oil or steam, state the operating and maximum temperature in your inquiry along with the fluid.<\/p>\n<h2 class=\"wp-block-heading\">Factor 5: Connections, space and maintenance<\/h2>\n<p class=\"wp-block-paragraph\">Match the end connection to the pipe exactly, down to the thread or flange standard. A 1-inch PT thread and a 1-inch NPT thread are different threads, and an ASME Class 150 flange (ASME: American Society of Mechanical Engineers) and a JIS 10K flange (JIS: Japanese Industrial Standards) are not interchangeable. In our range, threaded check valves cover 1\/2 to 3 inch and flanged swing check valves cover 2 to 4 inch.<\/p>\n<h3 class=\"wp-block-heading\">Threaded or flanged ends?<\/h3>\n<p class=\"wp-block-paragraph\">Threaded ends suit small lines, where the valve can be turned onto the pipe. Flanged ends suit larger lines and any valve you expect to take out for service, because it comes out by unbolting, without unscrewing or cutting the pipe.<\/p>\n<h3 class=\"wp-block-heading\">PT, NPT and PF threads are not interchangeable<\/h3>\n<p class=\"wp-block-paragraph\">Three thread families appear on threaded check valves. NPT is the American taper thread defined in <a href=\"https:\/\/www.asme.org\/codes-standards\/find-codes-standards\/b1201-pipe-threads-general-purpose-inch\" target=\"_blank\" rel=\"noopener\">ASME B1.20.1<\/a>. PT is the older JIS name (JIS B0203) for the 55-degree taper thread now marked R or Rc, covered internationally by <a href=\"https:\/\/www.iso.org\/standard\/20819.html\" target=\"_blank\" rel=\"noopener\">ISO 7-1<\/a> from the International Organization for Standardization (ISO) and often called BSPT, for British Standard Pipe Taper. PF is the older JIS name (JIS B0202) for the parallel thread now marked G, covered by <a href=\"https:\/\/www.iso.org\/standard\/33777.html\" target=\"_blank\" rel=\"noopener\">ISO 228-1<\/a> and often called BSPP, for British Standard Pipe Parallel; it seals on a gasket outside the threads rather than on the threads themselves.<\/p>\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<thead>\n<tr>\n<th>Hilo<\/th>\n<th>Est\u00e1ndar<\/th>\n<th>Thread angle<\/th>\n<th>Where it seals<\/th>\n<th>Threads per inch, 1\/2&#8243; and 3\/4&#8243;<\/th>\n<th>1&#8243; to 2&#8243;<\/th>\n<th>2-1\/2&#8243; and 3&#8243;<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>NPT<\/td>\n<td>ASME B1.20.1<\/td>\n<td>60\u00b0<\/td>\n<td>On the taper threads, with sealant<\/td>\n<td>14<\/td>\n<td>11.5<\/td>\n<td>8<\/td>\n<\/tr>\n<tr>\n<td>PT<\/td>\n<td>JIS B0203 \/ ISO 7-1<\/td>\n<td>55\u00b0<\/td>\n<td>On the taper threads, with sealant<\/td>\n<td>14<\/td>\n<td>11<\/td>\n<td>11<\/td>\n<\/tr>\n<tr>\n<td>PF<\/td>\n<td>JIS B0202 \/ ISO 228-1<\/td>\n<td>55\u00b0<\/td>\n<td>On a gasket or O-ring outside the threads<\/td>\n<td>14<\/td>\n<td>11<\/td>\n<td>11<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<p class=\"wp-block-paragraph\">The 1\/2 and 3\/4 inch sizes are the trap. NPT and PT both have 14 threads per inch there, so an NPT fitting will start into a PT valve and turn a few times before it binds. The thread angles still differ, the flanks never seat properly, and the joint can gall as it is tightened and leak under pressure. Our threaded check valves come with female PT threads from stock, with NPT or PF threads made to order, so state the thread standard on every RFQ. Our article on <a href=\"https:\/\/ballvalves.tw\/es\/conexiones-de-las-valvulas\/\">conexiones de las v\u00e1lvulas<\/a> compares threaded, socket weld and butt weld ends.<\/p>\n<h3 class=\"wp-block-heading\">Class 150 and JIS 10K flanges are not interchangeable<\/h3>\n<p class=\"wp-block-paragraph\">ASME Class 150 and JIS 10K are separate flange standards, and our own drawings show how far apart they sit. At 3 inch, the Class 150 flange has 4 bolt holes and the JIS 10K flange has 8. At 4 inch, the bolt circles are 190.5 mm and 175 mm. Neither pair lines up in the normal installed position. At 2 inch the bolt circles are 120.5 mm and 120 mm, with four 19 mm holes each, so bolts may pass, but the flange diameter and raised face still differ and neither standard covers the mixed joint. <a href=\"https:\/\/www.asme.org\/codes-standards\/find-codes-standards\/b16-5-pipe-flanges-flanged-fittings-nps-1-2-nps-24-metric-inch-standard\" target=\"_blank\" rel=\"noopener\">ASME B16.5<\/a> covers the American side, including pressure-temperature ratings, dimensions, bolting and gaskets. Our C-2F, C-3F and C-4F are made in both flange standards with the same face-to-face length, 203, 241 and 292 mm, so switching standards does not change the pipe layout. Order the standard your piping already uses.<\/p>\n<h3 class=\"wp-block-heading\">Space and access for maintenance<\/h3>\n<p class=\"wp-block-paragraph\">Measure the face-to-face length you have, then the room needed to get the valve out. A swing check valve is longer and needs clearance above the cap or bonnet, which is how its disc and hinge are reached. An inline spring check valve is short and fits tight spaces around pumps and manifolds. For threaded valves, check that the body can be turned on the thread during installation and removal without fouling nearby equipment. Ask how the internals are inspected and whether the valve has to come out of the line to do it.<\/p>\n<h2 class=\"wp-block-heading\">What does each type cost over its life?<\/h2>\n<p class=\"wp-block-paragraph\">Over the life of the valve, the costs that usually outweigh the purchase price are pump energy lost to pressure drop, damage from slam and the labor to replace a worn valve. On small lines, closing behavior usually outweighs pressure drop. On large, continuously running lines, pressure drop deserves a careful look.<\/p>\n<p class=\"wp-block-paragraph\">The energy cost of pressure drop is easy to estimate. Water horsepower equals flow in gpm times head in feet, divided by 3,960. In the Cv example above, the extra 4.1 feet at 30 gpm comes to about 0.03 hp delivered to the water, or roughly 0.05 hp of electrical input at an overall pump-and-motor efficiency of about 60%. Running around the clock, that is about 340 kWh a year, close to $50 at an example rate of $0.15 per kWh. On a 300 gpm line with the same 4.1-foot difference, it would be about ten times as much.<\/p>\n<p class=\"wp-block-paragraph\">Slam damage, such as worn pump parts, loosened pipe supports and leaking joints, is paid for after installation. That is why a spring check valve often wins on pump discharge lines even when it costs more to buy.<\/p>\n<p class=\"wp-block-paragraph\">We are not the cheapest source of check valves. What we offer is detailed inspection: every valve we make is leak tested before it leaves our factory in Taiwan, dimensions are checked, and a material test report is available on request.<\/p>\n<h2 class=\"wp-block-heading\">Standards you may see on a check valve data sheet<\/h2>\n<p class=\"wp-block-paragraph\">A standard on a data sheet tells you which rulebook a product was designed, dimensioned or tested to. The ones below come up most often when comparing check valves. A standard applies to a product only when that product&#8217;s documents name it, so if your project specification requires one, write it into the RFQ.<\/p>\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<thead>\n<tr>\n<th>Est\u00e1ndar<\/th>\n<th>What it covers<\/th>\n<th>When it matters<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>ASME B16.5<\/td>\n<td>Pipe flanges and flanged fittings, NPS (nominal pipe size) 1\/2 to 24: dimensions, pressure-temperature ratings, materials and bolting<\/td>\n<td>Flanged valves for American-spec piping<\/td>\n<\/tr>\n<tr>\n<td>JIS B2220<\/td>\n<td>Japanese steel pipe flanges, including the 10K rating<\/td>\n<td>Flanged valves for Asian-spec plants<\/td>\n<\/tr>\n<tr>\n<td>ASME B1.20.1<\/td>\n<td>NPT and related American pipe threads<\/td>\n<td>Threaded valves for US piping<\/td>\n<\/tr>\n<tr>\n<td>ISO 7-1 \/ JIS B0203<\/td>\n<td>Taper pipe threads that seal on the threads (PT)<\/td>\n<td>Threaded valves for Asian- and European-spec piping<\/td>\n<\/tr>\n<tr>\n<td>ISO 228-1 \/ JIS B0202<\/td>\n<td>Parallel pipe threads that seal on a gasket (PF)<\/td>\n<td>Threaded connections sealed with a gasket or O-ring<\/td>\n<\/tr>\n<tr>\n<td>API 594<\/td>\n<td>American Petroleum Institute (API) standard for check valves with flanged, lug, wafer and butt-welding ends, NPS 2 and larger<\/td>\n<td>Refinery and process plant specifications<\/td>\n<\/tr>\n<tr>\n<td>API 598<\/td>\n<td>Inspection and pressure testing of valves<\/td>\n<td>Projects that name a valve test standard<\/td>\n<\/tr>\n<tr>\n<td>ASTM A351<\/td>\n<td>ASTM International specification for castings for pressure-containing parts, including CF8 and CF8M<\/td>\n<td>Material certificates for cast stainless bodies<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h2 class=\"wp-block-heading\">Three common situations and the valve that fits<\/h2>\n<p class=\"wp-block-paragraph\">Steady horizontal flow points to a swing check valve. Frequent pump stops and cramped vertical risers point to a spring check valve. The three examples below show how the five factors lead there; treat them as patterns to compare against your own line.<\/p>\n<h3 class=\"wp-block-heading\">A horizontal cooling-water line with steady flow<\/h3>\n<p class=\"wp-block-paragraph\">A plant cooling-water branch runs at a near-constant flow, sits horizontal and has a pressure-drop budget. A swing check valve fits: low resistance, no spring to wear and enough steady flow to keep the disc fully open. Check that the flow reaches the valve&#8217;s full-open velocity. In threaded sizes up to 3 inch that points to a threaded swing check valve such as our SC. In 2 to 4 inch flanged piping it points to a flanged swing check valve such as the C-2F, C-3F or C-4F.<\/p>\n<h3 class=\"wp-block-heading\">A booster pump that starts and stops many times an hour<\/h3>\n<p class=\"wp-block-paragraph\">A small booster set in a building cycles on pressure demand, and residents hear a knock every time it stops. A spring check valve fits, because it closes before the water reverses. Check the cracking pressure against the head available at low demand, fit a strainer upstream if the water carries scale, and choose the spring grade together with the body. Our SC-1 covers 1\/2 to 2 inch threaded lines.<\/p>\n<h3 class=\"wp-block-heading\">A vertical riser inside a compact equipment skid<\/h3>\n<p class=\"wp-block-paragraph\">A pump on a skid discharges straight up into a vertical pipe, with little room for a long body. Both types can work in upward flow, but the space and the stop-start duty favor a short inline spring check valve. If the same skid has a section with downward flow, confirm that the specific model and spring are approved for it before ordering.<\/p>\n<h2 class=\"wp-block-heading\">Which YZNG TRONG check valve fits your line?<\/h2>\n<p class=\"wp-block-paragraph\">For low pressure drop on threaded lines up to 3 inch, choose the SC swing check valve. For frequent pump stops, vertical runs or tight spaces up to 2 inch, choose the SC-1 spring check valve. For 2 to 4 inch flanged lines, choose the C-2F, C-3F or C-4F. All three have cast stainless steel bodies; send the operating conditions with your RFQ so the offer matches your duty.<\/p>\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<thead>\n<tr>\n<th>Modelo<\/th>\n<th>Tipo<\/th>\n<th>Tallas<\/th>\n<th>Ends<\/th>\n<th>Material de la carrocer\u00eda<\/th>\n<th>Best fit<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>SC<\/td>\n<td>Threaded swing check valve<\/td>\n<td>1\/2&#8243; to 3&#8243;<\/td>\n<td>Female PT in stock; NPT and PF made to order<\/td>\n<td>CF8M in stock; CF8 made to order<\/td>\n<td>Horizontal or vertical up-flow lines where low pressure drop matters; rated 200 WOG (200 psi for water, oil and gas)<\/td>\n<\/tr>\n<tr>\n<td>SC-1<\/td>\n<td>One-piece inline spring (silent) check valve<\/td>\n<td>1\/2&#8243; to 2&#8243;<\/td>\n<td>Female PT in stock; NPT and PF made to order<\/td>\n<td>CF8 with SS304 spring in stock; CF8M with SS316 spring made to order<\/td>\n<td>Pump discharge with frequent stops, vertical runs, tight spaces<\/td>\n<\/tr>\n<tr>\n<td>C-2F, C-3F, C-4F<\/td>\n<td>Flanged swing check valve<\/td>\n<td>2&#8243;, 3&#8243;, 4&#8243;<\/td>\n<td>ASME B16.5 Class 150 or JIS B2220 10K<\/td>\n<td>CF8 with PTFE (fluoropolymer) gasket in stock; CF8M made to order<\/td>\n<td>Flanged pump discharge and cooling-water lines<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/ballvalves.tw\/wp-content\/uploads\/2026\/09\/check-valve-dimension-inspection-your-product-1024x683.webp\" alt=\"YZNG TRONG SC-1 spring check valve beside a digital caliper on an inspection workbench\" width=\"1024\" height=\"683\" \/><\/figure>\n<p class=\"wp-block-paragraph\">Regular items ship from stock and everything else is made to order. You can compare the full range on our <a href=\"https:\/\/ballvalves.tw\/es\/categoria-producto\/valvula-de-retencion\/\">v\u00e1lvulas de retenci\u00f3n de acero inoxidable<\/a> page, or go straight to the <a href=\"https:\/\/ballvalves.tw\/es\/producto\/valvula-de-retencion-roscada\/\">SC threaded swing check valve<\/a>, el <a href=\"https:\/\/ballvalves.tw\/es\/producto\/valvula-de-retencion-silenciosa\/\">SC-1 silent check valve<\/a> or the <a href=\"https:\/\/ballvalves.tw\/es\/producto\/valvula-de-retencion-con-bridas-304\/\">C-2F to C-4F flanged check valves<\/a>. If you are not sure what a WOG rating means, our <a href=\"https:\/\/ballvalves.tw\/es\/presion-nominal-wog\/\">Gu\u00eda de presiones nominales de WOG<\/a> explains it.<\/p>\n<h2 class=\"wp-block-heading\">Common mistakes when choosing a check valve<\/h2>\n<p class=\"wp-block-paragraph\">The six mistakes below are made while choosing or laying out the valve, and each one leads to noise, wear or leakage on either type of check valve. Each comes with its fix, so you can check your own line against the list.<\/p>\n<h3 class=\"wp-block-heading\">Sizing by pipe size alone<\/h3>\n<p class=\"wp-block-paragraph\">A 2-inch line does not automatically need a 2-inch check valve. If the flow is low for the size, a swing disc never opens fully and starts to flutter. Size to the flow range first, then check the connection. If you downsize, leave straight pipe after the reducer.<\/p>\n<h3 class=\"wp-block-heading\">Assuming a spring makes any orientation safe<\/h3>\n<p class=\"wp-block-paragraph\">A spring helps, but vertical down-flow still depends on the spring force and the weight of the closing element. Approval belongs to a specific model and spring.<\/p>\n<h3 class=\"wp-block-heading\">Joining PT and NPT threads<\/h3>\n<p class=\"wp-block-paragraph\">The two share 14 threads per inch at 1\/2 and 3\/4 inch, so they start together and then leak. Write the thread standard on the RFQ and again on the purchase order.<\/p>\n<h3 class=\"wp-block-heading\">Upgrading the body but not the spring<\/h3>\n<p class=\"wp-block-paragraph\">A CF8M body with a 304 spring in chloride service puts the weaker material in the most stressed part. Match the spring grade to the body grade.<\/p>\n<h3 class=\"wp-block-heading\">Placing the valve right after a pump or elbow<\/h3>\n<p class=\"wp-block-paragraph\">Turbulent flow makes a swing disc flutter and wears it early. Leave a straight run of pipe between the disturbance and the valve.<\/p>\n<h3 class=\"wp-block-heading\">Treating &#8220;silent&#8221; as a promise of no water hammer<\/h3>\n<p class=\"wp-block-paragraph\">A spring check valve reduces slam when a pump stops. It does not remove surges from other causes, so confirm what is actually making the noise before replacing a valve.<\/p>\n<h2 class=\"wp-block-heading\">What to include in a check valve RFQ<\/h2>\n<p class=\"wp-block-paragraph\">Send the duty, not just the size. A supplier can only check opening, pressure drop and closing behavior against conditions you state, and suppliers quoting the same list give you offers you can compare. Mark anything you do not know as unknown rather than guessing.<\/p>\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<thead>\n<tr>\n<th>Art\u00edculo<\/th>\n<th>Qu\u00e9 indicar<\/th>\n<th>Por qu\u00e9 es importante<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Fluid<\/td>\n<td>Name, concentration, solids or fibers<\/td>\n<td>Body, seat and spring materials; need for a strainer<\/td>\n<\/tr>\n<tr>\n<td>Temperatura<\/td>\n<td>Normal and maximum, plus cleaning or upset conditions<\/td>\n<td>Seat, gasket and spring limits<\/td>\n<\/tr>\n<tr>\n<td>Flujo<\/td>\n<td>Minimum, normal and maximum, with units<\/td>\n<td>Full-open check and pressure drop<\/td>\n<\/tr>\n<tr>\n<td>Presi\u00f3n<\/td>\n<td>Operating pressure and allowable pressure drop across the valve<\/td>\n<td>Rating and sizing<\/td>\n<\/tr>\n<tr>\n<td>Pump behavior<\/td>\n<td>How the pump stops, other pumps on the same header, any slam history<\/td>\n<td>Swing or spring choice<\/td>\n<\/tr>\n<tr>\n<td>Orientation<\/td>\n<td>Horizontal, vertical up-flow or vertical down-flow<\/td>\n<td>Permitted mounting<\/td>\n<\/tr>\n<tr>\n<td>Conexi\u00f3n<\/td>\n<td>Size and exact standard: PT, NPT, PF, Class 150 or JIS 10K<\/td>\n<td>Fit with your piping<\/td>\n<\/tr>\n<tr>\n<td>Space<\/td>\n<td>Available face-to-face length and access for removal<\/td>\n<td>Body style<\/td>\n<\/tr>\n<tr>\n<td>Documents<\/td>\n<td>Drawings, material test report and any project standards<\/td>\n<td>What ships with the valve<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h2 class=\"wp-block-heading\">Preguntas frecuentes<\/h2>\n<h3 class=\"wp-block-heading\">Is a spring check valve better than a swing check valve?<\/h3>\n<p class=\"wp-block-paragraph\">Neither type is better everywhere. A spring check valve is the stronger choice on pump discharge lines that stop often, on vertical runs and wherever slam or noise has been a problem, because its spring closes it before reverse flow builds. A swing check valve is the stronger choice on horizontal lines with steady flow where pressure drop matters, because its disc swings clear of the bore. Decide with five conditions: flow range, orientation, shutdown behavior, fluid and connections.<\/p>\n<h3 class=\"wp-block-heading\">Can a swing check valve be installed vertically?<\/h3>\n<p class=\"wp-block-paragraph\">Yes, in a vertical line with upward flow. Rising fluid holds the disc open, and when flow stops, gravity and reverse flow swing it back onto the seat. A swing check valve should not be installed in a vertical line with downward flow, because gravity would hold the disc away from the seat and the valve would not close on reverse flow. In a horizontal line, install it with the cap facing up, and always point the arrow on the body in the direction of flow.<\/p>\n<h3 class=\"wp-block-heading\">Does a spring check valve stop water hammer?<\/h3>\n<p class=\"wp-block-paragraph\">It reduces a common cause of water hammer at a pump. Check valve slam happens when reverse flow is already moving before the valve shuts, and a spring check valve starts closing as forward flow fades, so it stops far less reverse flow. In a field study on a 12-inch municipal pumping line in Barcelona, a nozzle check valve, typically a short-stroke spring-assisted design, cut the surge spike after valve slam by more than 80% compared with a swing check valve. Surges from other causes need their own solutions.<\/p>\n<h3 class=\"wp-block-heading\">Which has lower pressure drop, a swing or a spring check valve?<\/h3>\n<p class=\"wp-block-paragraph\">At full flow, a swing check valve usually has the lower pressure drop, because its disc swings clear of the bore while a spring check valve keeps its spring and poppet in the flow path. That advantage holds only when the swing disc is fully open; at low flow it may hang partly open and behave unpredictably. To compare two valves, use their published Cv values: divide your flow in US gpm by the Cv, square the result and multiply by the specific gravity to get the pressure drop in psi.<\/p>\n<h3 class=\"wp-block-heading\">Is a silent check valve the same as a spring check valve?<\/h3>\n<p class=\"wp-block-paragraph\">In most catalogs, yes. Silent check valve, spring check valve, inline check valve and non-slam check valve all describe a valve in which a spring pushes a piston, poppet or disc back to the seat before flow reverses, so it closes quietly. The names also overlap with other spring-assisted designs, such as dual-plate wafer check valves and spring-assisted swing check valves, so read the drawing rather than the name. Our SC-1 is a one-piece inline silent check valve with a stainless steel spring.<\/p>\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n<p class=\"wp-block-paragraph\">Choose a swing check valve for horizontal or upward lines with steady flow where pressure drop matters, and make sure the flow is high enough to hold the disc fully open. Choose a spring check valve for pump discharge lines that stop often, for vertical runs and for tight spaces, and choose its spring material to suit the fluid. Before you request quotes, write down the lowest and highest flow, the orientation at the valve and the exact thread or flange standard.<\/p>\n<p class=\"wp-block-paragraph\">If you are comparing our SC, SC-1 or C-2F to C-4F check valves, send the RFQ details above with your inquiry.<\/p>\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/ballvalves.tw\/es\/solicitar-presupuesto\/\">Solicita un presupuesto \u2014 te responderemos en un plazo de 24 horas \u2192<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>A swing check valve is the better default for a horizontal line with steady flow and a tight pressure-drop budget. A spring check valve is the better default for a pump that stops often, for a vertical run and for a tight space, because its spring closes it before flow reverses. Which one fits your [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":5240,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[48],"tags":[],"class_list":["post-5239","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-how-to-guides-tutorials"],"_links":{"self":[{"href":"https:\/\/ballvalves.tw\/es\/wp-json\/wp\/v2\/posts\/5239","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ballvalves.tw\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ballvalves.tw\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ballvalves.tw\/es\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/ballvalves.tw\/es\/wp-json\/wp\/v2\/comments?post=5239"}],"version-history":[{"count":4,"href":"https:\/\/ballvalves.tw\/es\/wp-json\/wp\/v2\/posts\/5239\/revisions"}],"predecessor-version":[{"id":5329,"href":"https:\/\/ballvalves.tw\/es\/wp-json\/wp\/v2\/posts\/5239\/revisions\/5329"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ballvalves.tw\/es\/wp-json\/wp\/v2\/media\/5240"}],"wp:attachment":[{"href":"https:\/\/ballvalves.tw\/es\/wp-json\/wp\/v2\/media?parent=5239"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ballvalves.tw\/es\/wp-json\/wp\/v2\/categories?post=5239"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ballvalves.tw\/es\/wp-json\/wp\/v2\/tags?post=5239"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}