Products Description
Cryogenic gate valve is an opening and closing device used for fully opening and fully closing.
The opening and closing part of the low-temperature gate valve is the gate plate. The movement direction of the gate plate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used model gate valve form a wedge shape. The wedge angle varies with the valve parameters, usually 50°, and 2°52° when the medium temperature is not high. The gate plate of the wedge gate valve can be made into a whole, called a rigid gate; it can also be made into a gate that can produce slight deformation to improve its craftsmanship and compensate for the deviation of the sealing surface angle during the processing. This kind of gate The plate is called an elastic gate.
|
Sizes Ranges |
1/2" - 30" |
|
Pressure Ratings |
Class 150 to Class 2500 PN16 to PN420 |
|
Ends Connections |
Flanged, Threaded, Welded Ends and Grooved |
|
Body Materials |
Cast or Forged Low Carbon Steel, Stainless Steel, Duplex & Super Duplex Steel, Special Materials upon request |
|
Trim Materials |
13%Cr, LF2, SS304, SS304L, SS316, SS316L and other specials |
Comparison of technical advantages
| Features | Cryogenic Gate Valve | Cryogenic ball valve | Cryogenic Butterfly Valve |
|---|---|---|---|
| Fluid resistance | Very small (flow channel is straight and unobstructed) | Medium (the ball partially blocks the flow path) | Larger (disc completely blocks flow path) |
| Sealing form | Line contact seal (strong wear resistance) | Surface contact seal (reliant on elastic material) | Surface contact seal (additional preload required) |
| Applicable pressure | High voltage (PN10~PN100/Class 600) | Medium and low voltage (PN16~PN40) | Low voltage (PN10~PN25) |
Sealing performance
Sealing structure design
Self-sealing mechanism: When closed, the medium pressure presses the gate sealing surface to the valve seat, forming a self-sealing effect (such as DZ41W type low-temperature gate valve), which can achieve sealing without relying on external forced pressure, and the leakage level can reach ANSI V level or higher.
Wedge-shaped sealing surface: The two sealing surfaces form a 50° wedge angle, which reduces friction and wear through line contact and enhances the contact strength of the sealing surface.
Material and process
Carbide seal: The valve seat and the gate sealing surface are welded with cobalt-based carbide (such as Stellite 6), which has small deformation and strong wear resistance at low temperatures, and can maintain sealing performance for a long time.
Cryogenic treatment process: The valve body is made of low-temperature steel such as LCB, LC3 or CF8 stainless steel, and has undergone -196℃ cryogenic impact test to avoid material brittle cracking and sealing failure.
Auxiliary sealing measures
Flexible packing seal: The stem packing adopts a combination structure of flexible graphite or polytetrafluoroethylene (PTFE), which can still maintain elasticity at low temperatures to prevent the medium from leaking along the stem.
Safety design
Anti-leakage and explosion-proof structure
Long-neck bonnet design: Extend the bonnet neck (such as DZ11H type) to ensure that the temperature of the stuffing box is higher than 0℃ to prevent the sealing material from freezing and failing due to low temperature.
Pressure relief hole configuration: A pressure relief hole is set on the inlet side of the gate. When the valve cavity is abnormally pressurized due to gasification of the medium, the pressure is automatically released to avoid valve burst.
Ability to resist extreme working conditions
Low temperature resistance: Supports working conditions of -196℃ (liquid nitrogen temperature) and below. The valve body is made of forged steel (such as ASTM A350 LF2), with excellent mechanical strength and impact resistance.
Anti-static design: Some models are equipped with static electricity export devices to prevent flammable media such as liquefied natural gas (LNG) from causing combustion and explosion due to friction static electricity.
Operational safety redundancy
Two-way sealing support: The medium can flow from any direction on both sides of the gate valve and achieve sealing, avoiding leakage due to wrong installation direction.
Failure safety mode: Equipped with an emergency shut-off device, it automatically closes when the system pressure is abnormal or the power is off to prevent uncontrolled leakage of the medium.
GNEE Cryogenic Valve Team Show
GNEE Cryogenic Valve Customer
Hot Tags: cryogenic gate valve, China cryogenic gate valve manufacturers, suppliers, factory, Quiet Check Valves, Swing Valve, ss non return valve, Cast Globe Valve, api 600 gate valve standard, trunnion supported ball valve