{"id":3849,"date":"2025-10-17T09:21:39","date_gmt":"2025-10-17T01:21:39","guid":{"rendered":"https:\/\/ballvalves.tw\/?post_type=product&p=3849"},"modified":"2026-09-12T01:46:27","modified_gmt":"2026-09-11T17:46:27","slug":"%e6%89%8b%e5%8b%95%e7%9c%9f%e7%a9%ba%e9%96%a5","status":"publish","type":"product","link":"https:\/\/ballvalves.tw\/zh\/product\/manual-vacuum-valve\/","title":{"rendered":"Manual Vacuum Valve \u2013 3-Piece Vacuum Isolation Ball Valve, KF NW16\u2013NW50 & ISO-K ISO80, 316, Lever or ISO 5211 Pad (V-3A \/ V-3AM)"},"content":{"rendered":"
PDF<\/span>V-3A \u771f\u7a7a<\/span>\u4f7f\u7528\u624b\u518a \u00b7 KF \/ ISO-K \u00b7 \u5c3a\u5bf8\u8868<\/span>\u4e0b\u8f09 \u2193<\/span><\/a>
\nPDF<\/span>V-3AM NW<\/span>ISO 5211 \u5b89\u88dd\u5ea7 \u00b7 NW\/KF \u00b7 \u5c3a\u5bf8\u8868<\/span>\u4e0b\u8f09 \u2193<\/span><\/a><\/div>\n

Manual Vacuum Valve or Direct-Mount? Two Builds, One Body (V-3A \/ V-3AM)<\/h2>\n

This manual vacuum valve is a three-piece 316 stainless ball valve with KF (NW16\u2013NW50) or ISO-K (ISO80) clamp flanges, built to isolate a section of vacuum line by hand. The same body comes in two builds: the V-3A with a stainless lever, and the V-3AM with an ISO 5211 mounting pad so a pneumatic or electric actuator can be bolted on later without a bracket. Pick by how the line will be operated \u2014 now and after the next upgrade.<\/p>\n\n\n\n\n\n\n\n
<\/th>\nV-3A\uff08\u624b\u52d5\uff09<\/th>\nV-3AM\uff08\u76f4\u63a5\u5b89\u88dd\u5f0f\uff09<\/th>\n<\/tr>\n<\/thead>\n
\u904b\u4f5c<\/b><\/td>\n\u5e36\u9396\u5b9a\u677f\u7684\u56db\u5206\u4e4b\u4e00\u8f49\u4e0d\u93fd\u92fc\u628a\u624b<\/td>\n\u9069\u7528\u65bc\u6c23\u52d5\u6216\u96fb\u52d5\u57f7\u884c\u5668\u7684 ISO 5211 \u588a\u7247 \u2014 \u9644\u6709\u4f9b\u624b\u52d5\u64cd\u4f5c\u7528\u7684\u64cd\u4f5c\u687f<\/td>\n<\/tr>\n
\u8ef8\u5c01<\/b><\/td>\nPTFE \u586b\u6599<\/td>\nViton O\u578b\u74b0\u642d\u914dPTFE\u586b\u6599<\/td>\n<\/tr>\n
\u6700\u9069\u5408<\/b><\/td>\nHand-operated isolation points on pump lines and manifolds<\/td>\n\u76ee\u524d\u5df2\u5be6\u73fe\u81ea\u52d5\u5316\u2014\u2014\u6216\u65e5\u5f8c\u53ef\u80fd\u5be6\u73fe\u81ea\u52d5\u5316\u2014\u2014\u7684\u751f\u7522\u7dda<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4e3b\u8981\u6280\u8853\u898f\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u985e\u578b<\/b><\/td>\nManual vacuum valve \u2014 three-piece vacuum isolation ball valve, full port<\/td>\n<\/tr>\n
\u6a21\u578b<\/b><\/td>\nV-3A (manual lever) \/ V-3AM (ISO 5211 direct-mount pad, lever included)<\/td>\n<\/tr>\n
\u5c3a\u5bf8\u7bc4\u570d<\/b><\/td>\n1\/2 \u82f1\u540b \u2013 2-1\/2 \u82f1\u540b<\/td>\n<\/tr>\n
\u7aef\u90e8\u9023\u63a5<\/b><\/td>\nKF clamp flange: NW16 (KF16) at 1\/2\u2033, NW25 (KF25) at 1\u2033, NW40 (KF40) at 1-1\/4\u2033, NW50 (KF50) at 1-1\/2\u2033 and 2\u2033. ISO-K flange: ISO80 at 2-1\/2\u2033.<\/td>\n<\/tr>\n
\u69cd\u8eab\u3001\u69cd\u5e3d\u8207\u5b50\u5f48<\/b><\/td>\nASTM A351 CF8M (cast 316 stainless steel) as standard; CF8 (cast 304) made to order<\/td>\n<\/tr>\n
\u5ea7\u5708\u8207\u588a\u7247<\/b><\/td>\nPTFE<\/td>\n<\/tr>\n
\u8396<\/b><\/td>\nASTM A276 SS316; V-3AM adds a Viton O-ring for a reinforced stem seal<\/td>\n<\/tr>\n
\u6e2f\u53e3<\/b><\/td>\nFull port \u2014 unrestricted bore through the valve<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6eab\u5ea6<\/b><\/td>\n\u221220 \u00b0C to +180 \u00b0C (valve body, set by the PTFE seats)<\/td>\n<\/tr>\n
\u670d\u52d9<\/b><\/td>\nVacuum and negative-pressure isolation \u2014 on\/off duty, not for throttling<\/td>\n<\/tr>\n
\u81f4\u52d5\u5668\u5b89\u88dd<\/b><\/td>\nV-3AM: ISO 5211 pad, direct mount, no bracket<\/td>\n<\/tr>\n
Dimension sheets<\/b><\/td>\nSee the PDF downloads above (V-3A KF \/ ISO-K, V-3AM NW)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Isolation Valve Design: Why a Three-Piece Ball Valve<\/h2>\n

A ball valve is the plain answer for an isolation point on a fore-line, roughing line or manifold: a quarter turn opens or closes it, and in the open position the full-port bore leaves nothing in the gas path, so the valve does not choke the pumping speed of the line it sits in. That is the job this valve is built for \u2014 shutting a section in or out \u2014 not regulating flow.<\/p>\n

The three-piece body is the service advantage. The two end caps stay clamped in the line while the centre section unbolts, so seats and ball can be inspected, cleaned or replaced without cutting the valve out or disturbing the flanges on either side. On a KF or ISO-K line that is an afternoon job with hand tools, not a rebuild.<\/p>\n

Seats and gaskets are PTFE, the stem is SS316, and the V-3AM adds a Viton O-ring on the stem for a reinforced seal where an actuator will be cycling it. The body, cap and ball are cast 316 (CF8M) as standard, with 304 (CF8) available to order.<\/p>\n

KF NW16\u2013NW50 or ISO-K ISO80 Ends<\/h2>\n

KF (also written NW, QF or ISO-KF) is the small quick-clamp vacuum flange: a centering ring with an O-ring sits between two flanges and a clamp closed by hand holds them together, no bolts and no tools. This valve covers KF16, KF25, KF40 and KF50 \u2014 the sizes vacuum lines are built from \u2014 at 1\/2\u2033 to 2\u2033.<\/p>\n

ISO-K is the larger clamp-flange standard that takes over where KF ends. The 2-1\/2\u2033 size here uses ISO80, held with clamps and a centering ring. Match the valve to the flange already on your line; the same three-piece body and the same lever or ISO 5211 pad sit behind either end.<\/p>\n

\u61c9\u7528<\/h2>\n

Where a manual vacuum valve of this type is actually used, and why a ball valve is the right tool there:<\/p>\n