UP STREAM SEALINGTWO-WAY VALVE

CVI trunnion mounted ball valve has two seats
on both side. Each seat has springs loaded and make seat insert contact the ball surface for sealing. So the valve is bi-directional sealing, and no limitation for installation.

FIRE-SAFE DESIGN API607/API6FA

When the seat inserts are softened and burnt in case of the fire or unusual temperature increase, the seat retainer, under the duty of the spring, will touch with the ball and form a metal-to-metal contact, which can prevent internal leak. Meanwhile, the middle flange and the upper part and lower part of the stem will form a metal-to-metal contact which can prevent external leak and conform to API6FA or API607.

VALVE CAVITY PRESSUREAUTOMATIC RELIEF

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

STEM AND SEAT EMERGENCY SEALANT INJECTION

The seat ring and the valve stem have a
special grease injection valve. In case of
the leakage, the grease will be injected to
the valve ball surface and to the stem room,
creates a temporary sealing.

DOUBLE BLOCK AND BLEED DBB

The trapped cavity pressure can bleed out by vent
fitting or drain plug when the valve is in fully open
or fully closed position. The fluid is intercepted by
seats of up stream and down stream side. So, the
stem packing or O-ring may be replaced under
working pressure. Each seat works independently
assuring tight seal against ball on both upstream
and downstream side.

 

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