Cryogenic gate valve
The gate valve is a commonly used shut-off valve, which is mainly used to connect or cut off the medium in the pipeline, and is not suitable for regulating the flow of the medium. The gate valve is suitable for a wide range of pressure, temperature and diameter, especially for medium and large diameter pipelines.
The main advantages of gate valve:
(1) The fluid resistance is small. The medium channel inside the gate body of the gate valve is straight through, and the medium does not change its flow direction when it flows through the gate valve, so the flow resistance is small.
(2) It is more labor-saving to open and close. When opening and closing, the movement direction of the gate is perpendicular to the flow direction of the medium. Compared with the globe valve, the opening and closing of the gate valve is more labor-saving.
(3) The flow direction of the medium is generally not restricted. The medium can flow in any direction from both sides of the gate valve, and can be connected or cut off. Easy to install, suitable for pipelines where the flow direction of the medium may change.
Main parts material and performance specification
| Main parts | valve body valve cover | carbon steel | chrome-nickel-titanium stainless steel | Chromium Nickel Molybdenum Titanium Stainless Steel | carbon stainless steel | Chrome molybdenum alloy steel | Cryogenic carbon steel | ||
| gate valve seat | Carbon steel surfacing carbide or stainless steel | chrome-nickel-titanium stainless steel surfacing hard alloy | Chromium Nickel Molybdenum Titanium Stainless Steel surfacing hard alloy | carbon stainless steel | Chrome molybdenum alloy steel surfacing hard alloy | Stainless steel surfacing hard alloy | |||
| valve stem | Chrome Stainless Steel | chrome-nickel-titanium stainless steel | chrome-nickel-titanium stainless steel | carbon stainless steel | Chrome molybdenum alloy steel | Stainless steel | |||
| packing | Graphite asbestos packing | Dip Poly tetrafluoroethylene asbestos packing | Flexible graphite asbestos packing | Dip Poly tetrafluoroethylene asbestos packing | |||||
| Gasket | Asbestos Gasket | Stainless steel with tetrafluoroethylene spiral wound gasket | Flexible graphite + stainless steel | polytetrafluoroethylene | |||||
| Stem Nut | High-nickel ductile iron/ZguAL10Fe3 | ||||||||
| Main parameters | Applicable media | water, steam, oil | Nitric acid type | Acetic acid type | Urea, methyl-ammonium liquid, etc. | Water, Steam, Petroleum, and Petroleum Products | Ammonia gas, liquid ammonia | ||
| Applicable temperature ℃ | ≤425 | ≤200 | ≤200 | ≤200 | ≤550 | -45～150 | |||
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