Robust, Corrosion-resistant Valves With Easy Maintenance
3-piece trunnion ball valve ensures precise flow control and shut-off in high-pressure systems, offering corrosion resistance and easy maintenance.
Robust, Corrosion-resistant Valves With Easy Maintenance
3-piece trunnion ball valve ensures precise flow control and shut-off in high-pressure systems, offering corrosion resistance and easy maintenance.
3-Piece Trunnion Ball Valve is a high-performance flow control device designed for robust shut-off and regulation in high-pressure industrial piping systems. Compliant with standards like API 6D, ASME B16.34, and GB12237, these trunnion mounted ball valves are crafted from materials such as forged stainless steel (AISI 316/304), carbon steel (A105), or duplex stainless steel, offering exceptional corrosion resistant ball valve properties. Widely used in oil and gas pipelines, petrochemical plants, power generation, and chemical processing, they provide reliable pipeline flow control under pressures up to 2500 PSI and temperatures ranging from -29°C to 425°C, ensuring durability in demanding environments.
Manufactured through precision forging or casting, the 3-piece trunnion ball valve features a three-part body design with a central body and two end caps bolted together, allowing easy in-line maintenance without pipeline removal. Available in sizes from 2" to 48" (DN50 to DN1200), they support flanged (RF, RTJ), butt-welded, or threaded connections, with full or reduced port options. The trunnion-mounted ball, supported by fixed shafts, reduces operating torque and enhances sealing under high-pressure conditions, making it ideal for high-pressure ball valve applications. PTFE or metal seats, combined with double block and bleed (DBB) functionality, ensure leak-free performance, while surface treatments like electroless nickel plating or passivation enhance corrosion resistance for harsh media like seawater or acids.
3-Piece Trunnion Ball Valves undergo rigorous testing, including hydrostatic, leakage, radiographic, and ultrasonic inspections, to comply with API 598, API 6D, and GB/T13927 standards. With a minimum tensile strength of 515 MPa and yield strength of 205 MPa for AISI 316, these valves ensure structural integrity in high-pressure systems. The DBB feature allows isolation and pressure relief, enhancing safety in critical applications like oil and gas pipelines. Fire-safe designs meet API 607 standards, and anti-static devices with blowout-proof stems ensure operational reliability. These valves support manual, pneumatic, or electric actuation for versatile control, with low torque requirements facilitating smooth operation.
Compared to floating ball valves, the 3-piece trunnion ball valve offers superior stability and sealing for large-diameter and high-pressure systems, making it a preferred choice for demanding applications. Certified by API 6D for pipeline safety and NACE MR0175 for sour gas environments, these valves are versatile for industries requiring robust performance. Their modular design allows for easy replacement of seats and seals, extending service life. Specialized versions, such as cryogenic trunnion valves for LNG at -196°C or metal-seated options for abrasive slurries, cater to niche applications, ensuring compatibility with complex piping systems.
Addressing challenges like pipeline corrosion, leaks, and high-pressure demands, 3-Piece Trunnion Ball Valves deliver reliable, efficient solutions for industrial piping systems. Their corrosion-resistant materials, easy maintenance, and advanced sealing make them a preferred choice for engineers seeking durable industrial ball valves. Backed by Sunny Steel’s white-glove service, these valves ensure exceptional performance, safety, and longevity in oil and gas, petrochemical, and power generation applications.
Sample specifications for reference. Designed for high-pressure, reliable operation with forged construction.
| Organization | Standard | Description |
|---|---|---|
| ANSI | American National Standards Institute | General industrial standards |
| API | American Petroleum Institute | Standards for oil and gas industry |
| ASME | American Society of Mechanical Engineers | Boiler and pressure vessel codes |
| BS | British Standards | UK national standards |
| GB, JB, HG | China Valve Standards | Chinese national and industry standards |
We offer valves in a wide range of materials to meet diverse industry requirements. Additional grades are available upon request.
| Material | Main Properties | Typical Applications |
|---|---|---|
| Carbon Steel | High strength, cost-effective | General industrial, water, oil & gas |
| Stainless Steel | Excellent corrosion resistance | Chemical, food, pharmaceutical |
| Alloy Steel | High temperature & pressure resistance | Power plants, refineries |
| Duplex Steel | High strength, seawater resistance | Marine, offshore, oil & gas |
| Nickel Alloys | Extreme corrosion & heat resistance | Chemical, aerospace, marine |
| Cast Iron | Low cost, limited strength | Low pressure water systems |
| Bronze & Brass | Seawater resistance | Marine, small valves |
Upstream, midstream, and downstream operations, including drilling, refining, and transportation.
Handling corrosive and hazardous chemicals in various chemical plants.
Steam, water, and fuel systems in thermal, nuclear, and hydroelectric plants.
Municipal water supply, wastewater treatment, and industrial water management.
Heating, ventilation, and air conditioning systems in commercial and industrial buildings.
Sterile and hygienic applications, precise flow control in sensitive industries.
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