Cryogenic disconnecting valve is used for low-temperature or ultra-low-temperature medium transportation pipeline indispensable low-temperature valve spare parts. Its function is to connect or cut off the pipeline medium. Simple structure, easy to manufacture and maintain; valve opening and closing, the valve stem along the axis of linear movement, sealing surface almost no friction between each other. And the opening and closing stroke is short, can meet the surrounding ambient temperature in -29 ℃ ~ -196 ℃ under the long-term working capacity.

The product has the following main structural features: 1. Valve flap in the full range of its stroke guided to meet the different installation directions (tilt installation or horizontal installation) under the valve sealing. 2.

2. valve cover according to the shell (qiao four sound) brand “low temperature medium under the valve specification requirements,” the extended and welded spacer / drip plate to meet the different low-temperature conditions to always ensure that the packing is in the temperature above zero, to ensure that the valve stem in the packing at the movement of the damage.

3. The small diameter space between the valve stem and the extended bonnet reduces the loss of heat transfer.

4. The upper seal is placed on the top of the extended bonnet to ensure that the upper sealing surface will not be damaged under low temperature condition. At the same time, the stem guiding sleeve is set at the bottom of the extended bonnet to make the stem move up and down smoothly.

5. The surfaces of the valve stem are hardened, and the roughness of the contact surface with the packing Ru value is less than 0.4μm.

6. For low temperature valves under -100℃, austenitic stainless steel is used. Valve body, valve cover, valve flap, valve seat, valve stem and other parts in the finishing process before the deep cold treatment of not less than 2 times.

7. Valve flap, valve seat sealing surface surfacing carbide, surfacing layer thickness is greater than 1.6 millimeters after processing. Use temperature is lower than -100 ℃ when the surfacing are deep-cooled after treatment.

Performance parameters:

Nominal diameter: DN15~DN600/NPS1/2~NPS24

Nominal pressure: PN16~PN100/Class150~Class600

Valve body material: carbon steel / 3.5% nickel steel / alloy steel / austenitic stainless steel

Temperature: -29℃~-196

Suitable medium: LNG, liquid nitrogen, liquid oxygen, liquid ammonia, etc.

Operation mode: manual, gear, pneumatic, electric

Design and manufacture: GB/T12235 GB/T 24925 API 623 ASME B16.34 MESC SPE77/200

Flange Size：JB/T 79/ GB／T 9113/HG／T 20592/ASME B16.5

Structure length：GB/T 12221/ASME B16.10

Inspection and test：GB/T 26480/API 598/ GB／T 24925/BS6364