Big size globe valve
1, first of all, it is recommended to choose bellows seal stop valve, to avoid the impact of piston valve, packing valve friction resistance, switch more easily.
2. Spool valve seat must be made of materials with good erosion and wear resistance, such as stellite carbide;
3. Double disc structure is recommended to avoid excessive erosion due to small opening, which will affect service life and sealing effect.
4, high temperature, high pressure medium on the pipeline or device appropriate to choose the cut-off valve.Such as thermal power plants, nuclear power plants, petrochemical system of high - temperature, high - pressure pipeline.
5. The tube path where convection resistance is not strictly required.Where the pressure loss is not taken into account.
This kind of big size globe valve plunger valve belongs to the radial seal, which is realized by two sealing rings on the grinding cylinder plug.The two seals are separated by a bushing ring, and the ground load on the cover is applied by the body and the bonnet ground connection bolt to tighten the seals around the plunger to ensure seal.The material combination of the valve is carbon steel for the shell, Cr stainless steel for the plunger, and flexible graphite for the seal ring, which can be used in oil pipeline.Stainless steel for shell, stainless steel for plunger, ptfe for sealing ring, suitable for acid and alkali corrosive medium.