Cryogenic Slab Gate Valve

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Technical Specification
Product name	Cryogenic slab gate valve
Design reference	API	ASME
Design standard	API 6D	ASME B16.34
Structural length	API 6D	ASME B16.10
Flanged ends	ASME B16.5、ASME B16.47	ASME B16.5、ASME B16.47
Butt-welding ends	ASME B 16.25	ASME B 16.25
Test & inspection	API 6D、API 607	API598、API 607
Packing:	To be packed in suitable wooden cases as per client's option or customized
Shipping & Delivery:	20-25 days lead time; deliver by ship from Ningbo port or Shanghai port
Notes: Serial valve connecting flange and butt-welding terminal size can be designed at customers'request. The material of the main parts and sealing surface of the valve can be designed and selected according to the actual working conditions or the special requirements of users.

 

 

1. Simple structure: The structure of the gate valve is relatively simple, composed of fewer parts, easy to manufacture and maintenance.

2. Good sealing performance: metal-to-metal sealing is formed between the gate valve disc and the seat, and the sealing performance is good, which can effectively prevent the leakage of the medium.

3. Small flow resistance: the flow diameter of the gate valve is basically the same as the diameter of the pipeline, the flow resistance is small, and the flow capacity is strong.

4. Flexible switch: The switch operation of the gate valve is simple, only need to rotate the valve stem to realize the lift of the gate plate, and the switch is flexible.

5. Wide range of application: gate valve is suitable for a variety of media, including liquid, gas and corrosive media.

 

 

• Our service tenet is customer first, service first. We will provide more accurate and efficient manufacturing and service according to customer requirements.
• We have a professional QC team to ensure that the products in Cryogenic slab gate valve meet your needs and do better.
• Check raw materials before production at Cryogenic slab gate valve.
• Spot checks are carried out during the processing of Cryogenic slab gate valve.
• 100% inspection of Cryogenic slab gate valve before shipment.
• Provide a one-year service for the products provided by Cryogenic slab gate valve to create value for customers.

 

 

• We have complete production technology and management.
• As a manufacturer our price is also good.

 

 

To be packed in suitable wooden cases as per client's

 

 

Q: What is a cryogenic valve?

A: Low temperature valve refers to the medium temperature of -40℃~-196℃ valve, common low temperature valves are divided into low temperature butterfly valve, low temperature gate valve, low temperature ball valve, low temperature globe valve, low temperature check valve, low temperature throttle valve and so on.

 

Q: What is the conventional low-temperature valve material choice?

A: 1. The valve body and valve cover are: LCB(-46℃), LC3(-101℃), CF8 (304) (-196℃).

2. Gate: stainless steel surfacing welding cobalt-based carbide.

3. Valve seat: stainless steel surfacing cobalt - based carbide.

4. Valve stem: 0Cr18Ni9.

 

Q: What are the test and inspection requirements for low temperature valves?

A: Perform the following tests on each valve:

1. Strength test of shell at normal temperature;

2. Normal temperature low pressure upper sealing test;

3. Low pressure seal test at normal temperature;

4. Low temperature upper seal airtightness test (with upper seal);

5. Low temperature gas seal test, etc., to ensure that the whole low temperature valve meets the requirements of the standard;

6. The main components are treated at low temperature and each batch is sampled for low temperature impact test to ensure that the valve is not brittle at low temperature conditions and can withstand the impact of low temperature media;

7. Low temperature (cryogenic) valves are treated at low temperature and impact test according to the corresponding material specifications;

8. The electrostatic function is more powerful, and the on-resistance between the valve body and the stem or the internals and the valve body is less than 1 ohms.

 

Q: What are the requirements for cryogenic valve design?

A: Various valves with a medium temperature of 40 ° C to -100 ° C are called low-temperature valves. Since the low-temperature valve has an extremely low operating temperature, in the design of this type of valve, in addition to following the design principles of general valves, there are some special requirements.

(1) According to the use situation, the design of low temperature valve has the following requirements:

① The valve should have the ability to work for a long time under low temperature media and ambient temperature, and the general service life is 10 years or 3000~5000 cycles.

② The valve should not become a significant heat source of the low-temperature system, because the heat inflow in addition to reducing the thermal efficiency, such as excessive inflow, will also make the internal fluid rapid evaporation, abnormal pressure, causing danger.

③ Low temperature media should not have harmful effects on hand wheel operation and packing sealing performance.

④ Valve assemblies directly in contact with low-temperature media should have explosion-proof and fireproof structures.

⑤ Valve assemblies working at low temperatures cannot be lubricated, so structural measures need to be taken to prevent chafing of friction parts.

 

(2) The factors that should be considered in the selection of the main material of the low-temperature valve have the following requirements:

① The minimum operating temperature of the valve.

② Mechanical properties required for metal materials to maintain working conditions at low temperatures, especially impact toughness, relative elongation and organizational stability.

③ The material has sufficient low temperature impact strength.

④ Materials have different cold shrinkage properties.

⑤ In the case of low temperature and oil-free lubrication, it has good wear resistance.

⑥ Has good corrosion resistance.

⑦ The welding performance of the material should also be considered when using welding.

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