Characteristics and application fields of Plug Valve

The working principle of Plug Valve is basically the same as that of ordinary Universal Valve. It is a bellows added between the valve seat and the valve body. It is used as an overpressure protection device on equipment or pipelines with unstable back pressure or toxic and corrosive media. The bellows can eliminate the influence of back pressure fluctuations on the performance of the Universal Valve, protect the spring and other internal parts from corrosion by the medium, and effectively prevent the leakage of the medium.

1. The valve seat and valve body are detachable, which is convenient and economical to maintain.

2. The umbrella-shaped recoil disc can effectively increase the lift, and the valve disc can be opened quickly under a small pressure to discharge the medium, thereby achieving the purpose of protecting the equipment.

3. The adjustment ring can adjust the satisfactory opening and closing pressure difference.

4. Reasonable selection of materials for the recoil disc and guide sleeve, Valve Stem and adjustment screw, and appropriate selection of clearances are made to ensure flexible movement of the valve disc.

5. The sealing surfaces of the valve disc and valve seat are welded with hard alloy, and the surface is finely ground to ensure high sealing and service life.

6. The bellows in the Plug Valve can eliminate the impact of back pressure fluctuations on valve performance, and can also protect springs and other internal parts from corrosion by the medium.

7. The selection and processing of springs and bellows are particular and strictly tested and inspected.

The Plug Valve is suitable for equipment and pipelines with air, steam, petroleum gas and other media with an operating temperature of ≤300℃ as an overpressure protection device. When the pressure in the equipment and pipeline exceeds the allowable value, the valve automatically opens and then discharges in full; when the pressure drops to the specified value, the valve automatically closes to ensure the safe operation of the equipment. It is widely used in industries such as electricity, metallurgy, petroleum, and chemical industry, but the Plug Valve is not suitable for use on reciprocating compressors, because the pressure fluctuation of the process fluid before and after the compressor is too large, and the bellows are sensitive to such fatigue stress, so the service life of the Universal Valve will be greatly reduced.