Since the pneumatic 3-way ball valve usually uses rubber, nylon, and PTFE as the seat seal ring material, its service temperature is limited by the seat seal ring material. The shut-off effect of the ball valve is accomplished by the metal ball pressing against each other between the plastic valve seats under the action of the medium (float valve). Under the action of appropriate contact pressure, the seat seal ring is elastoplastic deformed in local areas. This deformation compensates for the manufacturing accuracy and surface roughness of the ball to maintain the sealing performance of the ball valve.

And because the seat seal ring of the pneumatic three-way ball valve is usually made of plastic, the fire resistance and fire resistance of the ball valve should be considered in the selection of the structure and performance of the ball valve, such as in the petroleum, chemical, metallurgical and other departments, the use of ball valves in the equipment and pipeline system of flammable and explosive media, and more attention should be paid to fire resistance and fire prevention.

In general, it is recommended to use ball valves in pipeline systems with two-position adjustment, strict sealing performance, mud, wear, necking channel, fast opening and closing action (1/4 turn opening and closing), high pressure cut-off (large pressure difference), low noise, cavitation and gasification, a small amount of leakage to the atmosphere, small operating torque and low fluid resistance.

Features:

(1) The fluid resistance is small, and its resistance coefficient is equal to that of the pipe section of the same length.

(2) Simple structure, small size and light weight.

(3) Good sealing, at present, most of the sealing surface materials of ball valves are made of plastic, which has good sealing, and has been commonly used in vacuum systems.

(4) Easy to operate, fast opening and closing, only 90° rotation from full open to full closed, convenient for long-distance control.

(5) It is easy to maintain, the structure of the ball valve is simple, the sealing ring is generally movable, and it is more convenient to disassemble and replace.

(6) When fully open or fully closed, the sealing surface of the ball and the valve seat is isolated from the medium, and when the medium passes, it will not cause the erosion of the sealing surface of the pneumatic three-way ball valve

(7) The scope of application is wide, the diameter is from a few millimeters to several meters, and it can be applied from high vacuum to high pressure.

Pneumatic three-way ball valve is suitable for:

Pneumatic three-way ball valves are also suitable for pipeline systems with light structure, low pressure shut-off (small differential pressure), and corrosive media. Ball valves are also available in cryogenic (cryogenic) installations and piping systems. In oxygen piping systems in the metallurgical industry, ball valves that have undergone a rigorous degreasing treatment are used. When the main lines in oil pipelines and gas pipelines need to be buried underground, full-bore welded ball valves are used. When regulating performance is required, a ball valve with a V-shaped opening structure is required. In petroleum, petrochemical, chemical, electric power, urban construction, the working temperature of more than 200 degrees of the pipeline system can choose metal-to-metal sealed ball valves, pneumatic three-way ball valves are mainly used in chemical, petroleum, textile, electric power, food, refrigeration, aviation, aerospace, papermaking and other industrial fields.