The opening and closing components of liquefied gas shut-off valves, liquefied petroleum gas shut-off valves, liquefied gas flange shut-off valves, carbon steel liquefied gas shut-off valves, cast steel liquefied gas shut-off valves, and stainless steel liquefied gas shut-off valves are plug shaped valve discs, with a sealing surface that is flat or conical. The valve disc moves linearly along the centerline of the fluid. The movement form of the valve stem includes a lifting rod type (the valve stem is lifted and lowered without the handwheel lifting), as well as a lifting rotating rod type (the handwheel rotates and lifts together with the valve stem, and the nut is set on the valve body). The bellows globe valve is only suitable for fully open and fully closed, and is not allowed to be adjusted or throttled. Liquefied gas globe valves belong to forced sealing valves, so when the valve is closed, pressure must be applied to the valve disc to force the sealing surface not to leak. When the medium enters valve six from below the valve disc, the resistance that the operating force needs to overcome is the frictional force between the valve stem and the packing, as well as the thrust generated by the pressure of the medium. The force required to close the valve is greater than the force required to open it, so the diameter of the valve stem should be larger, otherwise the valve stem will bend due to failure.
| Valve stem |
Forged steel, carbon steel |
| Work Temperature |
80ºC |
| Pressure Range |
PN1.0-4.0Mpa |
| Applicable media |
Liquefied gas, natural gas |
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