صمام بوابة التبريد العميق

Key considerations for selection:

1. Temperature range : confirm the lowest operating temperature (such as -196℃ liquid nitrogen);
2. Material : Stainless steel (such as 304/316L) or low-temperature alloy is recommended for the valve body;
3. Sealing structure : Adopt elastic sealing or bellows design to prevent low-temperature leakage;
4. Standard certification : Conforms to BS6364, API 6D and other Cryogenic Valve standards.

The core differences include:

• Material resistance to low temperatures : Ordinary valves are prone to brittle cracks at low temperatures, and low-temperature gate valves use special processing technology;
• Extended bonnet design : reduces external heat input and prevents packing from freezing;
• Sealing technology : Maintain elastic sealing even under low temperature conditions to avoid leakage risks.

خطوات التثبيت الرئيسية:

• Precooling treatment : Slowly cool down to avoid thermal stress on materials;
• Direction calibration : confirm that the medium flow direction is consistent with the valve marking;
• Bolt pre-tightening : tighten the flange bolts evenly to prevent leakage due to low temperature shrinkage;
• Leak test : Use a helium leak detector to perform ultra-low temperature leak test.

 Leakage may be caused by the following reasons:

• Sealing surface damage : Low-temperature medium crystallizes and wears the sealing surface, requiring grinding or replacement of the valve disc;
• Packing failure : Replace with graphite or PTFE packing specially made for low temperature;
• Loose bolts : Low temperature shrinkage causes the connection to become loose and requires regular retightening.

Recommended maintenance measures:

• Regular lubrication : Use special low-temperature grease (such as fluorine grease);
• Moisture-proof and rust-proof : drain the residual liquid in the valve when shutting down to avoid freezing and expansion;
• Periodic testing : Ultra-low temperature opening and closing and sealing tests are carried out once a year.

Common materials include:

• Stainless steel : 304/316L (applicable below -196℃);
• Low temperature steel : LF2, LCB (in accordance with ASTM A352 standard);
• Special alloys : Monel and Inconel are used for highly corrosive media.

Yes, but you need to choose a high-pressure design model (such as Class 600 or above) and ensure that:

• The valve body wall thickness is enhanced;
• Adopt metal hard seal or double seal structure;
• Certified by high pressure gas burst test (such as API 6D).