VALVE CAVITY PRESSURE
AUTOMATIC 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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