Cryogenic Gate Valve
Description of Cryogenic Gate Valve:
The main material of ZECO cryogenic gate valve is selected. Considering from the metallographic aspect, in addition to austenitic steel, copper and aluminum with face centered cubic lattice, general steel will appear low temperature brittleness at low temperature, thus reducing the strength and service life of the valve. When the temperature is higher than -100℃, choose ferritic steel; when the temperature is lower than -100℃, choose austenitic steel; low pressure and small diameter valves can choose copper and aluminum and other materials.Stem and fastener is selected, when the temperature is higher than -100℃, stem and bolt materials adopt Ni, Cr-Mo alloy steel, through appropriate heat treatment, to improve tensile strength and prevent thread bite.Austenitic stainless steel is used when the temperature is higher than -100℃.Low hardness of 18-8 acid resistant steel will cause mutual abrasion between stem and packing, causing leakage of packing.Therefore, the stem surface must be hard chrome plated (thickness 0.04-0.06mm), or nitride and nickel-phosphorous plated to improve surface hardness.In order to prevent nuts and bolts from biting to death, the nuts are generally made of Mo steel or Ni steel and coated with molybdenum disulfide on the surface of the threads.
Features of Cryogenic Gate Valve:
- cryogenic ball valve suppliers,the product of ZECO cryogenic gate valve uses flexible wedge or open wedge. These structures maintain a reliable seal regardless of temperature;
Material of Cryogenic Gate Valve:
|
No |
Part |
Material |
|
1 |
Body |
ASTM A350 LF3 |
|
2 |
Seat Ring |
ASTM A276 410 + STL |
|
3 |
Wedge |
ASTM A350 LF3 + STL |
|
4 |
Stem |
ASTM A182 F6 |
|
5 |
Bonnet Gasket |
Graphite + SS316 |
|
6 |
Bonnet Bolt |
ASTM A193 B16 |
|
7 |
Bonnet Nut |
ASTM A194 4 |
|
8 |
Bonnet |
ASTM A350 LF3 |
|
9 |
Backseat |
ASTM A182 410 |
|
10 |
Stem Packing |
Reinforced Graphite |
|
11 |
Handwheel |
KTH330-08 |
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