They are produced for liquid gases O₂, N₂,Ar, He, H₂, CO₂, NH₃. They are made of stainless steel or brass. They are installed on stable tanks for storaging liquid gases or portable car tanks. These can be operated manually, pneumatically or by electric motor. Pipeline connection can be welded (BW, SW), theaded or flanged. They are produced in sizes DN10-DN80.