Products Details

Cryogenic Gate Valve (Cryogenic Gate Valve) is a special valve for low temperature media, widely used in power, petroleum refining, petrochemical, offshore oil, urban chemical and other fields, suitable for liquid nitrogen, liquid hydrogen, liquid oxygen and other media transmission and control.

Product type and description
Product type: Switch type (ON/OFF)
Product Description: Low temperature gate valve
Model: Z40H, Zp43/44/48H(F)- Low temperature gate valve
Specification parameter
Nominal diameter: NPS 2 "~ 48" (DN50 ~ DN1200)
Operating temperature: -196℃ ~ 300℃ (the service temperature range of different materials may be different)
Nominal pressure: CLASS 150 ~ 2500 (PN20 ~ PN420)
Materials: The main materials include A351 CF8, CF8M, CF3, CF3M; A352 LCB, LCC, etc
Design and manufacturing standards
Design standards: API 600, API 6D, ASME B16.34, GB/T 12234, GB/T 12224, BS 6364
Structure length: ASME B16.10, GB/T 12221
Connecting end: ASME B16.5, ASME B16.47, ASME B16.25, GB/T 9113, GB/T 12224
Test standards: API 598, ISO 5208, GB/T 26480, GB/T 13927, BS 6364
Mode of operation
Operation mode: non-lifting hand wheel, helical gear, motor drive unit, pneumatic drive unit
Application field
Low temperature gate valve is mainly used in power industry, petroleum refining, petrochemical engineering, offshore oil, urban chemical construction and other fields.

Other characteristics
The sealing surface of the seat and valve disc is surfacing with hard alloy to improve corrosion resistance and extend the service life of the valve.
The main components are treated at low temperature when the temperature is ≤-101℃ to prevent valve deformation at ultra-low temperature.
SS+ graphite or metal seal or pressure self-seal between body and bonnet ensures reliable sealing.
The valve stem structure is a rising rod structure, so that the valve switch position is clear.
The valve stem thread is not in contact with the medium to reduce the corrosion of the medium to the thread.
Small switching torque, reliable sealing.
Gate valve has wedge-shaped elastic, self-sealing parallel double plate and stretching parallel double plate structure, and has good sealing performance.
Small flow resistance, large flow, good flow characteristics.
For small wedge elastic gate valves, interchangeable with process tools.
Through the improvement of structural design and the selection of reasonable packing structure and qualified packing suppliers, the valve can meet the ISO 15848 FE Class A sealing test requirements.
Working principle of low temperature valve
Leakage of low-temperature media is not only dangerous, but also costly, because the conversion of gas into low-temperature media itself requires costs. The various components of the valve will contract and expand at different rates depending on the material composition or the time of exposure to low temperature media. Since the increase in ambient heat is a constant challenge when dealing with low-temperature media, the insulation of valves and pipes is mandatory. Gas treatment involves dealing with the physical properties of gases such as liquefied natural gas, nitrogen, oxygen, argon, and helium. These liquids are unstable at atmospheric pressure and can, if allowed, violently and instantaneously transform into a gaseous state.

Low temperature gate valve detailed structure
Bolted bonnet: Extended stem, threaded or welded seat ring
Full diameter: OS&Y, rising stem, flexible wedge, pressure relief hole on seat, stainless steel trim
Material standard: ASTM A352 LCB, LC1, LC2, LC3, LC4, A351 CF8, A351 CF8M
Standard compliance:
Design and Manufacture: API 600, API 6D, BS1414
Face to face (end-to-end) : ANSI B16.10, API 6D
Flange connection: 2 to 24 inches to ANSI B16.5
Welded end: ANSI B16.25
Test and check: API 598, API 6D