Design Features:

• Urgent Grease Injection Device

According to customers requirement, the trunnion ball valve ca be provided with devices for urgent grease injection, which are on both the stem and seat for trunnion ball valves of DN>150mm(NPS6), and in the body cavity for the valve of DN<125mm. When the O ring of stem or the body seat ring is damaged due to accident, leakage between body and stem can be prevented by injecting the sealing grease through the device.

• Double Block & Bleed

In general, our trunnion ball valve features the front ball sealing design structure. Each seat of the ball valve can separately cut off the medium at both inlet and outlet of the valve to realize double-block functions. When the ball valve is closed, body cavity and two of the body ends can be blocked with each other even if both the inlet and outlet are under pressure, when the medium left in the body cavity might be bled through the relief valve.

• Fire-safe Design

In the event of fire, the non-metal parts such as seat sealing ring of PTFE, O ring for stem and sealing gasket for body and bonnet, might be damaged due to high temperature. Our special design of auxiliary metal to metal or the graphite seal is provided in the trunnion ball valve to effectively prevent both internal and external leakage of the valve. As required by customers, our fire safe design for the trunnion ball valve meets the requirement API 607, API 6Fa, BS6755.

• Self-relief Body Cavity

As the liquid medium left in the body cavity gasifies due to increased temperature, the pressure in the body cavity becomes abnormally higher, when the medium itself in the cavity would propel the seat and self-relieves the pressure o ensure the safety of valve.

• Bi-sealing Design - seat sealing in front of ball and behind ball

According some special working conditions and customers requirement,  we can provide trunnion ball valve with the Bi-sealing design structure, i.e. seat sealing in front of the ball and seat sealing behind the ball, so  the reliable sealing of the valve is ensured, the valve can work normally even if one of the effective sealing designs becomes lost due to abnormal condition. Regarding the seat in front of the ball, the piston effect formed by the area difference between D1 and D2, plus the pre-tightened force of a spring would cause the seat in front of the ball by the pressure difference of the medium before and after the valve to touch the ball closely to form the tightness, of which the sealing force will become bigger as the pressure difference gets higher.

• Blow-out Proof Stem
• Anti-static Device

Applicable Standards & Specifications:

• Design and Manufacture : API 6D, API 608, ASME B16.34, MS SP-72,      BS 5351, BS6364, ANSI／AWWA C507,  BFCI 70-2, ISO 5211
• Connection Ends : ASME B16.5, B 16.47, API 605, MSS SP-44,              ISO 7005-1, JIS B2238, BS 12627, ASME B16.25, ASME B16.11,            BS 12760
• Face to Face Dimension : ASME B16.10, ISO 5752, BS558, BS12982
• Inspection & Testing : API 6D, API 598, API 607/API 6FA, BS6755,        BS 12569, MSS SP-61
• Nominal Pressure Rating : Class 150 - 2500, JIS 10K - 20K, PN10 - 160
• Nominal Diameter or Bore : NPS 4 - 36, DN50 - 900
• Applicable Temperature: -196 °C to 540 °C
• Manual, Worm Gear, Pneumatic, or Electrical Operations