Working principle and application of dj661f-40p low temperature emergency shut-off valve:

The low temperature pneumatic shut-off valve is made of austenitic stainless and acid resistant steel. The surface of the valve rod is plated with hard chromium (plating thickness 0.04-0.06mm), or nitrided and nickel phosphorus plated to improve the surface hardness. In order to prevent the nut from seizing with the bolt, the nut is generally made of Mo steel or Ni steel, and the thread surface is coated with molybdenum disulfide.

Dj661f-40p low temperature emergency shut-off valve is mainly used in gas liquefaction equipment and air separation equipment; Natural gas liquefaction, storage and transportation equipment; Low temperature storage tanks and tank cars for liquid oxygen, nitrogen, argon, hydrogen and carbon dioxide; Pressure swing adsorption oxygen and nitrogen production equipment. It is widely used in energy, petrochemical, metallurgy, railway and other industries. Applicable temperature: -196 ℃ - +80 ℃

Structural features of dj661f-40p low temperature emergency shut-off valve:

1. Low temperature valve gasket adopts stainless steel wallet PTFE or flexible graphite spiral wound gasket structure;

2. When the low-temperature valve is closed, a pressure relief structure is set on the high-pressure side of the ram or valve body to prevent abnormal gasification and pressure rise of the low-temperature medium in the valve chamber due to temperature rise;

3. The sealing surface of low-temperature valve is overlaid with cobalt based cemented carbide, which has small deformation and wear resistance at low temperature, and can maintain good sealing performance.

4. The bonnet of the low-temperature valve is designed as a long neck structure, which can isolate the influence of low-temperature medium on the packing and make the valve open and close flexibly;

5. The packing adopts flexible graphite or polytetrafluoroethylene combined structure, and the low-temperature valve has good low-temperature resistance;