CBV Trunnion Mounted Ball Valve

Design Features

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Fire-Safe Design API607/API6FA

When the seat inserts are softened and burned in case of the fire or unusual increase in temperature, the seat retainer, under the pressure of the spring, will touch the ball and form a metal-to-metal seal, which will prevent internal leakage. Meanwhile, the middle flange and the upper part and lower part of the stem will form a metal to metal contact which will prevent external leakage and conform to API 6FA or API 607.

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Valve Cavity Pressure Automatic Relief

When the body cavity pressure exceeds the seat springs pressure by thermal expansion of the fluid trapped in valve cavity, automatic pressure relief will occur, relieving the body cavity pressure past the downstream seat. When equilibrium is reached, the seat ring will move back to contact the ball surface as a “Piston Effect”.

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Stem and Seat Emergency Sealant Injection

The seat rings and the valve stem have special grease injection valves. In case there is leakage, grease can be injected to the ball surface and to the stem-packing gland, creating a seal.