Ultra-low Temperature Flat Gate Valve

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1. It has the advantages of simple and compact structure, reasonable design, reliable sealing, light and flexible operation, small size, smooth channel, low resistance, easy installation and easy disassembly.

2. When the valve is fully opened, the flow resistance coefficient is very small, and the valve will eliminate the function of the valve disc and the dirt on the sealing surface every time the valve is opened and closed.

3. The packing is made of flexible graphite ring and graphite packing, reliable sealing, light and flexible operation.

4. It is widely used in oil and water steam pipelines such as petrochemical industry and thermal power plants to connect or cut off the intermediate quality of pipelines. The sealing surface of the opening and closing device has compact structure and reasonable design.

• 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 Ultra-low temperature flat gate valve meet your needs and do better.
• Check raw materials before production at Ultra-low temperature flat gate valve.
• Spot checks are carried out during the processing of Ultra-low temperature flat gate valve.
• 100% inspection of Ultra-low temperature flat gate valve before shipment.
• Provide a one-year service for the products provided by Ultra-low temperature flat 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 an ultra-low temperature valve?

A: Valves for medium temperatures below -150 ° C are called ultra-low temperature valves.

Q: Where are the conventional ultra-low temperature valve materials used?

A: Mainly used for 300,000 tons of ethylene, liquefied natural gas and other chemical plants. The output liquid low-temperature media such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum products, etc., are not only flammable and explosive, but also gasification when heating up, and the volume expands hundreds of times when gasification.

Q: What is the focus of ultra-low temperature valve selection and processing?

A: The main material of the ultra-low temperature valve (-254 (liquid hydrogen) ~ -101 ℃ (ethylene)) must be face-centered cubic lattice austenitic stainless steel, copper alloy or aluminum alloy, and its low temperature mechanical properties after heat treatment, especially low temperature impact toughness must meet the requirements of the standard. The following austenitic stainless steels can be used to manufacture ultra-low temperature valves. ASTM A351 CF8M, CF3M, CF8 and CF3, ASTM A182F316, F316L, F304 and F304L, ASTM A433 316, 316L, 304, 304L and CF8D. The valve body, valve cover, gate or valve disc of ultra-low temperature valves must be cryogenic in liquid nitrogen (-196 ° C) before finishing.

Q: Why do cryogenic valves require long neck valve covers?

A:

① The long-neck valve cover has the function of protecting the stuffing box, because the sealing of the stuffing box is one of the keys of the low-temperature valve. If there is leakage, it will reduce the cooling effect and lead to the gasification of liquefied gas. At low temperature, with the decrease of temperature, the elasticity of the packing gradually disappears, and the leakproof performance decreases. Due to the leakage of the medium, the packing and the valve stem are frozen, which affects the normal operation of the valve stem. At the same time, the valve stem moves up and down and scratches the packing, causing serious leakage. Therefore, it is necessary to ensure that the temperature of the stuffing box is above 8℃.

② The long neck structure is easy to wrap cold retaining materials to prevent cold energy loss.

③ The long neck structure facilitates the valve main parts to be quickly replaced by removing the valve cover. Because process pipes and valves in the cold section of the equipment are often installed in the "cold box", the long-necked valve cover can protrude through the "cold box" wall. When replacing the main part of the valve, only the valve cover is removed without removing the valve body. The valve body is welded into a whole with the pipe, which reduces the leakage of the cold box as much as possible and ensures the tightness of the valve.

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