Description

Firesafe Design:

a) Internal leakage prevention

When seat insert, O-ring and spacer are damaged in a fire, the line pressure and the seat preloaded spring push the seat metal lip onto the ball surface to cut off the line fluid and prevent the internal leakage to reach the fire-safe purpose. Beside, the seat graphite packing can prevent fluid leakage between the valve body and the seat.

b) External leakage prevention

A combination of O-ring and graphite gasket on body & bonnet connection, body&gland connection, and stem&gland joint, can prevent the external leakage. When O-ring are damaged after a fire, body gasket, gland gasket, and stem packing, it is still on the performance of sealing and prevents external fluid leakage.

c) Blow-out Proof Stem:

The stem is designed with integral T-type shoulder to provide blow-out proof effectively. It is internally inserted as the backseat function to assure stem sealing safety at all pressures.

d ) Anti-Static Device:

The ball valve could be designed as static-protecting construction as required, namely, mouting conductive spring between the globe body and stem, or between the stem and body. There after the static engendered during opening the valve could be conducted to pipelines then through the pre-set static passage to clear static away. The design works to prevent igniting combustible medium by static fire-striking for the system safety.