Carbon Steel Trunnion Ball Valve

Carbon steel trunnion ball valve is an industrial valve that uses a carbon steel valve body (such as WCB material) and integrates a trunnion-fixed ball structure. It can accurately cut off the fluid by rotating the ball 90°. It is designed for high-pressure and harsh working conditions.

Structural features
The core structural design of the carbon steel trunnion ball valve enhances stability and sealing:

Trunion support system: The ball is fixed in the valve body through the upper and lower trunnions (rigid support shaft). The ball has no displacement under high pressure to avoid misalignment and wear of the sealing surface; the valve stem has an anti-flying structure to prevent the component from spraying out when overpressure occurs.

Bidirectional sealing valve seat: Spring preloaded valve seat (PTFE soft seal or Stellite alloy hard seal), which automatically compensates for wear after being pressurized to achieve bidirectional zero leakage under Class 600 working conditions.

Full bore/reduced bore flow channel: Full bore (100% pipeline flow) or reduced bore flow channel (reducing valve volume and cost) can be selected according to the working conditions.
Carbon steel valve body reinforcement: ASTM A216 Gr.WCB cast valve body, surface hardening treatment, pressure resistance up to 32MPa (Class 2500), applicable temperature -29℃～425℃.

Pressure rating: Class 150 to Class 2500 (corresponding to PN16 to PN420);
Diameter range: DN15 to DN1200 (1/2" to 48");
Temperature limit: Standard carbon steel (WCB): -29℃ to 425℃; Low temperature extended type (LCB): -46℃ to 345℃;
Connection method: Flange (ASME B16.5), welding end (ASME B16.25) or threaded connection.

 

Carbon Steel Trunnion Ball Valve

 

 Advantages ‌
‌High-pressure stability‌: The trunnion support offsets the fluid thrust, and the seal life of Class 600 working conditions is increased by 50%; ‌

Economical and durable‌: The cost of carbon steel valve body is 30% lower than that of stainless steel, it is resistant to particle erosion and has a long maintenance cycle; ‌

Safety redundancy‌: Triple safety design of fire prevention, anti-static and anti-valve stem blowout; ‌

Strong adaptability‌: Compatible with manual/pneumatic/electric actuators and supports automatic control.

 Applications ‌
Oil and gas‌: High-pressure oil pipeline shut-off valve (Class 600+), sour natural gas wellhead control; ‌

Energy and power‌: Power station boiler steam pipeline (≤425℃), cooling water system; ‌

Chemical smelting‌: Corrosive medium (acid, alkali) transportation, high-temperature molten salt pipeline; ‌

Industrial system‌: Compressed air trunk line, metallurgical cooling water, water treatment dosing pipeline.

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