The pneumatic thread ball valve, a valve featuring threaded connection, is actuated by a pneumatic mechanism. It is composed of several key components:
Valve Body: Typically crafted from cast steel, stainless steel, or brass, both ends of the valve body are outfitted with either internal or external threads, like NPT, BSPT, or G threads. These threads facilitate the connection with pipelines, ensuring a secure and leak - free fit.
Ball: Functioning as the crucial on - off element, the ball has a through - hole. A 90 - degree rotation enables it to switch between the open and closed states. To enhance its durability and service life, the surface of the ball can be hardened, thus improving its resistance to wear and tear.
Sealing Elements: In order to accommodate diverse media, including corrosive substances and those under high - temperature conditions, common sealing materials such as PTFE, PPL, or metal hard seals are employed. These seals play a vital role in preventing leakage and maintaining the integrity of the valve.
Valve Stem: Linked to the pneumatic actuator, the valve stem serves to transfer torque, which in turn drives the rotation of the ball. To ensure safe operation, it is designed with a blow - out proof feature, safeguarding against potential hazards.
Pneumatic Actuator: Predominantly constructed in a compact rack - and - pinion or scotch - yoke configuration, this actuator offers the flexibility of single - acting (spring - return) control, where a spring restores the valve to its original position when air pressure is removed, or double - acting control, which uses air pressure on both sides for operation.
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