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he High-Performance Fixed Ball Valve (professionally designated as a Trunnion Mounted Ball Valve) is a premier heavy-duty isolation component engineered to deliver positive, bubble-tight shutoff in high-pressure, large-diameter pipeline networks. Unlike floating designs where the ball is supported solely by the elastomer seats, the ball core in a trunnion-mounted configuration is mechanically anchored and pivoting on a fixed upper stem and a heavy-duty lower trunnion bearing plate. This robust structural alignment ensures that the immense fluid thrust generated under high differential pressures is completely absorbed by the valve body bearings rather than the sealing elements. The trunnion mounted ball valve is designed for reliable on/off control in high-pressure and high-temperature applications. Constructed from carbon steel (WCB) or stainless steel, it features a robust trunnion design that ensures excellent stability and sealing performance under severe service conditions. Available in sizes from DN50 to DN1200 and pressure ratings up to PN40 (Class 150), this valve complies with GB/T 12237 and is suitable for water, steam, oil, gas, and other media at temperatures ranging from -29°C to 425°C. Ideal for power plants, petrochemical, and industrial pipeline systems. Manufactured and fully tested under strict adherence to GB/T 12237, API 6D, and ASME B16.34 standards, this trunnion-mounted valve series covers a broad size spectrum from DN50 up to DN1200. It incorporates sophisticated safety designs as standard configurations, including an anti-blowout stem assembly, integrated automatic cavity pressure relief, double block and bleed (DBB) multi-isolation capacity, and a certified fire-safe secondary metal sealing lip that maintains containment in emergency fire events. Rated for working temperatures spanning from -29°C up to 425°C, this series is the industry benchmark for high-velocity industrial networks. | |||||||||
SDF
Ultra-Low Operating Torque: The fixed trunnion bearing assembly absorbs line fluid thrust, preventing the ball from compressing excessively against the downstream seats, ensuring smooth, low-torque actuation under high pressures.
Spring-Loaded Dynamic Sealing: Features floating resilient or metal seats energized by pre-loaded springs, ensuring a dependable bubble-tight seal (Rate A per EN 12266-1) even under ultra-low differential line pressures.
Double Block and Bleed (DBB) Functionality: Both upstream and downstream seats seal the ball independently. This allows the centralized body cavity to be safely drained or vented via a bleed plug while the valve is in the fully open or fully closed position.
Automatic Cavity Pressure Self-Relief: If liquid medium trapped inside the central body cavity undergoes thermal expansion and over-pressurizes, the spring-loaded seats automatically back off slightly, venting the excess pressure safely back into the pipeline.
Firesafe & Anti-Static Safety Systems: Metallic grounding springs discharge electrostatic build-up caused by fluid friction, while secondary metal-to-metal backseats seal fluid if primary soft inserts are compromised by external fire.
This large-scale trunnion ball valve series is explicitly designed for main pipeline grids, long-distance transmission loops, and high-flow processing infrastructures handling clean or mild abrasive water, oils, and gases.
Primary Applications Include:
Oil & Gas Transmission Lines: High-volume crude oil pipelines, natural gas trunk distribution networks, and regional compressor station headers.
Petrochemical Refineries & Tank Farms: Tank storage isolation manifolds, high-flow product transfer lines, and refinery processing loops.
Power Plant Utilities: Circulating cooling water systems, heavy water supply manifolds, and low-pressure auxiliary steam networks.
Water Distribution Networks: Municipal water supply headers, high-pressure industrial pumping stations, and large-scale wastewater networks.
Parameter Item | Standard Specifications / Values |
|---|---|
Design & Manufacturing Standard | GB/T 12237 / API 6D / ASME B16.34 |
Pressure-Temperature Rating | GB/T 12224 / ASME B16.34 |
Face-to-Face Dimensions | GB/T 12221 / API 6D / ASME B16.10 |
Flange End Connections | GB/T 9113 / HG/T 20592 / ASME B16.5 / ASME B16.47 |
Inspection & Fire Testing | GB/T 13927 / API 6D / API 598 / API 607 / ISO 10497 |
Nominal Size Range Scope | DN50 to DN1200 (NPS 2" to NPS 48") |
Nominal Pressure ratings | PN10, PN16, PN25, PN40 / ASME Class 150, Class 300 |
Body Shell Material Options | ASTM A216 WCB (Carbon Steel), ASTM A351 CF8/CF8M (Stainless Steel) |
Ball Core Hardening Options | SS304/SS316 + ENP (Electroless Nickel Plating), Chrome Plating |
Seat Sealing Polymers | PTFE, R-PTFE, Nylon, Devlon, PEEK / Metal-to-Metal Hard-faced |
Actuator Mount Pattern | ISO 5211 Standard Top Flange Pad |
Available Operator Assemblies | Heavy Bevel Gearbox , Pneumatic, Electric |
Trunnion vs. Floating Selection Bounds: For sizes up to DN150 working at low pressures, floating ball valves are economical. However, for large bore pipelines from DN200 up to DN1200 or higher pressure drops, always select this Trunnion Mounted Configuration to protect seats from cold flow and to keep actuation torque manageable.
Seat Sealing Insert Selection: For standard hydrocarbons and clean water services below 120°C, specify PTFE or R-PTFE inserts. For high-pressure gases or high-temperature lines exceeding 150°C (up to 200°C), select Nylon, Devlon, or PEEK inserts to prevent premature compression deformation. If handling particulate slurries up to 425°C, specify hard-faced metal-to-metal seating.
Actuation Matching & Gearboxes: When operating large-diameter valves (DN300 and above as shown in file image_a5a49b.png), always equip the valve with the illustrated high-ratio Enclosed Bevel Gearbox or an automatic electric/pneumatic drive to manage the large mass inertia of the ball assembly during execution.
Zero Throttling Maintenance Rule: Trunnion ball valves are strictly designed for complete fluid isolation (fully open or fully closed). Utilizing the valve for throttling or fluid regulation will wear down the floating seat rings asymmetrically, destroying the bi-directional sealing integrity and leading to permanent internal seat leakage.
1.When can I get a quotation?
We typically provide a quotation within 4 hours of receiving your inquiry. Urgent requests are given priority.
2.Do you support customized valves?
Yes. We support OEM and customized valves according to drawings, specifications, and special working conditions.
3.What is the production lead time?
Normally, production can be completed within 15 working days after order confirmation, depending on product type and quantity.
4.What standards do your valves comply with?
Our products comply with GB, ANSI, API, JIS, DIN, BS, and other international standards.
5.What pressure, size, and temperature ranges can you supply?
Pressure: Class 150-3500 Size: DN10-DN3000 Temperature: -196ºC to 610ºC
6.What certifications do you have?
We are certified with ISO 9001, CE, and provide third-party inspection and test reports upon request.
7.What delivery and payment terms do you offer?
Delivery terms: EXW, FOB, CFR, CIF
Payment terms: T/T (30% deposit + 70% balance), L/C, and other terms by agreement.
8.Do you provide technical support and spare parts?
Yes. We offer 24/7 technical support and supply spare and consumable parts for long-term service.
