Definition and Application
A pneumatic stainless - steel ball valve is a type of valve where the main body is constructed from stainless - steel material and is actuated by a pneumatic device. Its primary function is to either cut off or establish the connection of fluid media within pipelines. The core opening and closing element is a stainless - steel ball. By rotating this ball 90 degrees, rapid switching and control of the fluid can be accomplished. Given the excellent corrosion - resistance and high - temperature - resistance properties of stainless steel, this valve finds extensive applications in industries with stringent requirements for hygiene and corrosion - resistance, such as the food, pharmaceutical, chemical, and water treatment industries.
Structural Components
Body and Ball: The body and ball are made through casting or forging processes using stainless - steel grades like 304 and 316. These materials offer high corrosion - resistance, making the valve suitable for use in harsh environments involving acids, alkalis, and salt spray.
Sealing Material: For the valve seat, common sealing materials include PTFE (Polytetrafluoroethylene), PPL (Reinforced Polypropylene), or metal hard seals. These materials are selected to meet the demands of different temperatures, ranging from - 50°C to 250°C, and various media.
Valve Stem: The valve stem is crafted from stainless - steel, which provides rust - resistance and wear - resistance. It is designed with an anti - blowout structure when connecting to the actuator, ensuring operational safety.
Pneumatic Actuator: The pneumatic actuator is available in two types: single - acting (spring - return) and double - acting (two - way air - control). Additionally, it can be equipped with solenoid valves and positioners to enable automatic control.
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