Guide e tutorial

Short answer: NPT, BSPT and BSPP share nominal sizes but do not seal against each other. NPT (ASME B1.20.1) is a 60° taper thread. BSPT (R and Rc in ISO 7-1 and JIS B 0203; PT in Taiwan and Japan) is a 55° taper thread. BSPP (G; PF in JIS) is a 55° parallel thread

Short answer: Specify a one-piece or a seal-welded two-piece body, which has no body joint open to atmosphere, and have the supplier confirm that construction for every size on the order. Then write the three leak paths every ball valve keeps on the request for quotation (RFQ): stem seal material and peak temperature, with a

On most compressed air lines, a brass ball valve and a stainless steel ball valve will both hold the pressure. The choice comes down to what else travels through the pipe. On dry, clean, treated air, a brass compressed air ball valve is the lower-cost choice. Where condensate collects, compressor oil carries over, or the

Yes, you can use a ball valve for steam, as long as the valve carries a steam rating that covers your line. That rating depends on three things: the seat material, the stem packing, and the pressure and temperature the manufacturer allows together. A WOG rating does not answer the question. It is a cold

CF8M material is the ASTM casting grade for 316-type stainless steel: 18 to 21 percent chromium, 9 to 12 percent nickel, 2 to 3 percent molybdenum, with carbon held to 0.08 percent. To specify a CF8M ball valve, write that casting grade against the cast parts, then add the five things the grade does not

A valve actuator manufacturer builds the actuator that drives a valve. When the same company also casts the ball valve, the interface between them, the ISO 5211 mounting pad, the stem coupling, the wiring or the air fitting, is matched before either part leaves the building, rather than reconciled afterward by whoever receives two separate

Ball valve manufacturing comes down to four things a buyer can actually check: what the body is cast from, how it is machined, how the body joint is made, and whether every finished valve is tested before it ships. This article walks through each of them at YZNG TRONG, a stainless steel ball valve manufacturer

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

A gear operator turns a ball valve with muscle, through a worm gear and a handwheel. An electric actuator turns it with a motor. Fit a gear operator on large valves that rarely move. Fit an electric actuator when the valve cycles often, sits somewhere awkward, or must close itself when the power fails. What

Quando si automatizza una valvola, la prima vera decisione da prendere non riguarda la marca dell’attuatore, bensì la scelta tra il modello a ritorno a molla e quello a doppio effetto. Entrambi aprono e chiudono una valvola a sfera a un quarto di giro tramite aria compressa, ma si comportano in modo completamente diverso nel momento che conta di più: quando l’alimentazione dell’aria o