DQ41F low temperature ball valve,low temperature ball valve,temperature ball valve, ball valve

【 Product Features 】

1, the material of the pressure part can withstand the expansion and contraction caused by the change of the temperature of the medium, and the structure of the sealing part will not produce perfect deformation when the temperature changes. For conditions below -100 ° C, the valve parts should be cryogenic treatment before finishing, that is, the parts are placed in the liquid nitrogen tank for cooling, and when the temperature of the parts reaches -196 ° C, the insulation starts for l-2h. Then take out of the box and natural treatment to room temperature, repeat the cycle 2 times.

2, the valve cover adopts a long neck structure, its purpose is to protect the function of the stuffing box, so that the stuffing box is far away from the low temperature position, to ensure the sealing effect of the stuffing. At the same time, it can also wrap the cold retaining material to prevent the loss of cold energy. The length of the neck of the long neck (H. see below) can be selected according to the temperature of use and the thickness of the cooling material. When the sealing effect of the packing is reduced, grease can be added from the middle of the packing box (see combined packing structure) to form an oil seal layer, reduce the pressure difference of the packing box and improve the sealing performance.

3, when the use temperature is lower than -100℃, the valve stem material is chrome plated or nitriding treatment to improve the surface hardness of the valve stem and improve the reliability of the packing seal.

4, the low-temperature ball valve has a structure to prevent abnormal pressure increase, due to the low-temperature valve medium gasification, its volume expansion, the pressure will be abnormally increased, when the pressure in the valve cavity rises, the valve cavity and the inlet side of the connection, or the valve inlet is placed in the pressure relief valve, to ensure the safe use of the valve.

5, low temperature ball valve gasket has at room temperature, low temperature state and temperature changes can reliably seal and restore

【 Product use 】

Low temperature ball valve series is mainly suitable for ethylene, liquefied natural gas and other chemical equipment, the output of liquid low temperature media such as ethylene, liquid oxygen, liquid hydrogen and so on. This kind of medium is not only flammable and explosive, but also gasification when heating up, and when gasification, the volume expands hundreds of times. Moreover, these media have strong permeability, are easy to leak, and are difficult to process and manufacture.

Packing of Standard Packing: 

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 470 gallon liquid totes Special package is available on request. E FORUs’  is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition