{"id":1191,"date":"2026-10-05T06:37:12","date_gmt":"2026-10-05T06:37:12","guid":{"rendered":"https:\/\/wdlvalve.com\/?p=1191"},"modified":"2026-10-12T02:07:21","modified_gmt":"2026-10-12T02:07:21","slug":"%d8%af%d9%84%d9%8a%d9%84-%d8%b5%d9%85%d8%a7%d9%85-%d8%a7%d9%84%d9%81%d8%b1%d8%a7%d8%b4%d8%a9-%d8%a7%d9%84%d8%b1%d9%82%d8%a7%d8%a6%d9%82%d9%8a-%d8%ab%d9%84%d8%a7%d8%ab%d9%8a-%d8%a7%d9%84%d8%a5%d8%b2","status":"publish","type":"post","link":"https:\/\/wdlvalve.com\/ar\/%d8%af%d9%84%d9%8a%d9%84-%d8%b5%d9%85%d8%a7%d9%85-%d8%a7%d9%84%d9%81%d8%b1%d8%a7%d8%b4%d8%a9-%d8%a7%d9%84%d8%b1%d9%82%d8%a7%d8%a6%d9%82%d9%8a-%d8%ab%d9%84%d8%a7%d8%ab%d9%8a-%d8%a7%d9%84%d8%a5%d8%b2\/","title":{"rendered":"\u0635\u0645\u0627\u0645 \u0641\u0631\u0627\u0634\u0629 \u0647\u0648\u0627\u0626\u064a \u0639\u0627\u0644\u064a \u0627\u0644\u0623\u062f\u0627\u0621 \u0628\u062b\u0644\u0627\u062b \u0625\u0632\u0627\u062d\u0627\u062a"},"content":{"rendered":"
\n
\n

A pneumatic high performance triple offset wafer butterfly valve<\/strong>
\ncombines non-rubbing triple-offset geometry, a multilayer metal sealing
\nsystem and pneumatic quarter-turn operation. It is designed for automated
\nshutoff in high-temperature, high-pressure and high-cycle industrial
\npipelines where conventional soft-seated butterfly valves may not be suitable.<\/p>\n


\n\"WDL
\n<\/a><\/p>\n<\/header>\n

\n

How Does a Triple Offset Butterfly Valve Work?<\/h2>\n

The first offset places the shaft behind the disc sealing plane. The
\nsecond moves the shaft away from the pipe centerline. The third introduces
\nan angled, cone-shaped sealing geometry. These three offsets allow the disc
\nand seat to separate quickly when the valve opens and make sealing contact
\nmainly near the final closing position.<\/p>\n

Because the sealing surfaces do not slide against each other through the
\nfull stroke, friction and wear are reduced. This makes the design suitable
\nfor frequent operation and demanding metal-seated service.<\/p>\n<\/section>\n

\n

Why Use Pneumatic Actuation?<\/h2>\n

A pneumatic actuator provides fast 90-degree operation and can be
\nintegrated into an automated process. Depending on the project, the
\npackage may include a solenoid valve, limit switch box, positioner and
\nair filter regulator. Double-acting and spring-return arrangements can
\nbe selected according to the required fail position.<\/p>\n

Final actuator sizing must consider valve torque, differential pressure,
\noperating frequency, air pressure, cycle time, installation position and
\nthe required safety factor. The actuator should not be selected from
\nnominal pipe size alone.<\/p>\n<\/section>\n

\n

WDL Valve Technical Range<\/h2>\n
\n\n\n\n\n\n\n\n\n\n
\u0646\u0648\u0639 \u0627\u0644\u0645\u0646\u062a\u062c<\/th>\nPneumatic high performance triple offset wafer butterfly valve<\/td>\n<\/tr>\n
\u0646\u0637\u0627\u0642 \u0627\u0644\u0645\u0642\u0627\u0633\u0627\u062a<\/th>\nDN50\u2013DN400 \/ NPS 2\u201316<\/td>\n<\/tr>\n
Flange Compatibility<\/th>\nHG 20592 PN10\u2013PN25, ASME B16.5 Class 150 and JIS 10K<\/td>\n<\/tr>\n
Face-to-Face Reference<\/th>\nGB\/T 12221 \u0648 API 609<\/td>\n<\/tr>\n
Sealing System<\/th>\nTriple-offset multilayer metal sealing system<\/td>\n<\/tr>\n
\u062a\u0631\u0643\u064a\u0628 \u0627\u0644\u0645\u0634\u063a\u0644<\/th>\nISO 5211<\/td>\n<\/tr>\n
Operation Options<\/th>\nPneumatic actuator; manual, worm gear and electric options available<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Dimensions, pressure ratings and torque figures are reference information.
\nThe final construction must follow the approved WDL Valve drawing and
\n\u0648\u0631\u0642\u0629 \u0628\u064a\u0627\u0646\u0627\u062a \u0627\u0644\u0645\u0634\u0631\u0648\u0639.<\/p>\n<\/section>\n

\n

Main Design Features<\/h2>\n