API 6D Class 900 Trunnion Mounted Ball Valve (Forged A105N, SIL 2, PED)
Supreme Valves' API 6D Class 900 Trunnion Mounted Ball Valve is engineered for heavy-duty pipeline isolation and gas distribution networks. Cast or forged from premium ASTM A105N carbon steel with 13Cr trim, full-bore flow path, and robust soft-seated or metal-to-metal seating. Certified to SIL 2 safety levels, PED Module H compliant, and NACE MR0175 sour service standard.
Key Applications
Industrial Applications & Engineering Problem Solving
The Engineering Challenge
High-pressure oil and gas pipeline loops deal with explosive, highly volatile hydrocarbons under extreme mechanical stress. Standard floating ball valves become inoperable at high pressure due to massive operating torque. Sudden gas decompression (AED) can cause wetted O-rings to rupture, resulting in catastrophic gas leakage, pipeline failures, and severe safety hazards.
The Supreme Valves Engineering Solution
Supreme's API 6D Class 900 valve uses a trunnion-mounted configuration where the ball is anchored by bearings, reducing torque by up to 50% at high pressure. It is fitted with Viton AED (Anti-Explosive Decompression) O-rings that survive sudden pressure drops without blister damage. The forged ASTM A105N shell is SIL 2 rated for automated Emergency Shutdown Systems (ESD).
Operational Use Cases & Scenarios
Mainline Emergency Shutdown (ESD)
Operational Challenge: Providing rapid, high-integrity isolation of 150-bar natural gas pipelines in case of downstream pipeline damage.
Engineering Benefit: SIL 2 safety rating and pneumatic scotch yoke actuator ensure the valve closes in <1 second upon trip command.
High-Pressure LPG Manifold Isolation
Operational Challenge: Isolating highly volatile liquid petroleum gas (LPG) where bubble-tight shutoff is required at Class 900 pressure rating.
Engineering Benefit: Devlon/PEEK seats provide secondary metal-to-metal contact, ensuring complete isolation and fire safety.
Technical Specifications
Material of Construction (MOC)
Purchase Options
Features & Benefits
API 6D Certified
Manufactured exactly to API 6D specifications with full traceability and fire-safe testing per API 607.
SIL 2 Capable
Certified to Safety Integrity Level 2 (SIL 2) for automated emergency shutdown (ESD) networks.
NACE MR0175 Compliance
All wetted components conform to sour gas hardness limits to prevent sulfide stress cracking (SSC).
Anti-Explosive Decompression
Equipped with AED Viton O-rings to survive high-pressure gas decompression loops without seal failure.
Frequently Asked Questions
Q What is a Trunnion Mounted Ball Valve?
In trunnion valves, the ball is anchored at the top and bottom by bearings. The line pressure forces the upstream seat against the ball, rather than forcing the ball against the downstream seat as in floating valves, reducing operating torque at high pressures.
Q What does PED Module H represent?
The Pressure Equipment Directive (PED) Module H is a European certification indicating full quality assurance from design through to final inspection, allowing export into the EU.
Q Are these valves suitable for hydrogen or sour gas?
Yes, with NACE MR0175 compliance and AED seals, they are highly suited for sour hydrocarbons, natural gas, and low-concentration hydrogen loops.