Shoulong Valve
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Trunnion-mounted ball absorbs axial loads under high pressure, reducing torque and ensuring long-term sealing stability.
Spring-loaded seats maintain reliable sealing during low-pressure start-up and pressure fluctuations.
Single or double piston effect seat designs available to meet different pressure relief and safety requirements.
Double Block and Bleed configuration enables cavity pressure relief and sealing integrity verification.
Designed to maintain sealing performance during fire exposure for emergency isolation in hydrocarbon service.
Seat and stem sealant injection available upon request for temporary sealing under abnormal conditions.
Trunnion-mounted ball valves have the ball mechanically anchored by trunnion supports at the top and bottom, which absorbs pipeline pressure loads. This design significantly reduces operating torque under high pressure and extends seat life.
SPE (Single Piston Effect) seats allow pressure relief from the cavity, while DPE (Double Piston Effect) seats provide bi-directional sealing integrity. The choice depends on specific safety and pressure relief requirements.
DBB allows both upstream and downstream seats to seal independently. The bleed port between them enables operators to vent or monitor body cavity pressure to verify sealing integrity.
Fire-safe valves are designed and tested according to international standards such as API 607, API 6FA, and BS 6755 Part 2, ensuring reliable emergency isolation during fires.
It is used when a seat or stem seal is damaged under abnormal conditions (contamination or extreme temp), providing a temporary seal until permanent repairs are made.
Yes, with spring-energized seat sealing, these valves maintain consistent sealing force by compensating for material contraction at extreme temperatures.
