18061659285
1500LB Top Entry WCB Trunnion-Mounted Ball Valve - China Suppliers and Factory for High-Pressure Pipeline Solutions
Key Features
Robust Trunnion Support Design
Trunnion-mounted ball absorbs axial loads under high pressure, reducing torque and ensuring long-term sealing stability.
Spring-Energized Seat Sealing
Spring-loaded seats maintain reliable sealing during low-pressure start-up and pressure fluctuations.
SPE / DPE Seat Options Available
Single or double piston effect seat designs available to meet different pressure relief and safety requirements.
Integrated DBB with Bleed Port
Double Block and Bleed configuration enables cavity pressure relief and sealing integrity verification.
Fire-Safe Construction for Hydrocarbon Service
Designed to maintain sealing performance during fire exposure for emergency isolation.
Optional Emergency Sealant Injection
Seat and stem sealant injection available upon request for temporary sealing under abnormal conditions.
Frequently Asked Questions
-
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, extends seat life, and provides more stable, long-term sealing performance compared to floating ball valves.
-
SPE (Single Piston Effect) seats seal from one direction and allow pressure relief from the cavity in case of over-pressurization. DPE (Double Piston Effect) seats seal from both directions, preventing cavity pressure relief, which is suitable for applications requiring bi-directional sealing integrity. The appropriate configuration depends on the specific pressure relief and safety requirements of the application.
-
The Double Block and Bleed (DBB) function allows both upstream and downstream seats to independently seal against pressure while the valve is closed. The bleed port between the two seats enables operators to vent or monitor the body cavity pressure, verifying sealing integrity or relieving trapped pressure. This is critical for maintenance safety and isolation applications.
-
Fire-safe trunnion ball valves are typically designed and tested in accordance with international standards such as API 607, API 6FA, and BS 6755 Part 2. These standards define requirements for maintaining sealing performance under fire exposure conditions, ensuring the valve can provide reliable emergency isolation during hydrocarbon fires.
-
Emergency sealant injection is typically used when a seat or stem seal has been damaged or degraded under abnormal operating conditions, such as extreme temperature, contamination, or mechanical damage. The injectable sealant provides a temporary seal to restore valve integrity and prevent leakage until a permanent repair or replacement can be performed.
-
Yes, trunnion ball valves with spring-energized seat sealing are well-suited for both cryogenic and high-temperature applications. The spring-loaded seat design compensates for material contraction or expansion at extreme temperatures, maintaining consistent sealing force. Material selection for the ball, seats, seals, and body must be specified according to the operating temperature range of the application.