Natural Gas Pipeline 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.

5. Suitable for natural gas, petroleum, chemical, gas pipelines and other transmission lines, vent systems and steam storage devices, used as opening and closing equipment. Long haul pipeline for natural gas extraction and purification.

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• Check raw materials before production at Natural gas pipeline flat gate valve.
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To be packed in suitable wooden cases as per client's

Q: Selection of natural gas valve materials?

Answer: According to the pressure of the gas pipeline network, the selection of the appropriate valve shell material should not only meet the safe operation of the pipeline network, but also reduce costs, and pay attention to the following points when selecting:

1) Desulfurized natural gas still contains a small amount of hydrogen sulfide, which is a toxic and highly corrosive gas, it reacts with iron to produce iron sulfide, flake off, corrosion of mechanical equipment, the pipeline valve material selection to choose corrosion resistant to sulfur.

2) For the urban medium and low pressure gas transmission network with P≤0.2MPa, it is recommended to choose gray cast iron valves. Although gray cast iron has low strength and plasticity (flake graphite cuts the matrix, easy to cause stress concentration), brittleness, but because of its good corrosion resistance and low price, it is widely welcomed. Therefore, from the point of view of cost, gray cast iron valves are used in construction.

3) For 0.2MPa< When P≤0.8MPa, it is recommended to use ball ground cast iron or cast steel valves, and ball ground cast iron valves are preferred. Because in terms of mechanical properties, the two are comparable, but the corrosion resistance of cast iron and casting process are better than cast steel, and the price is only 70% of the cast steel valve, it is worth noting that if the choice of cast iron, it is necessary to strengthen the quality of the cast iron material to be monitored.

4) For P> At 0.8MPa, cast steel valve is recommended.

Q: What are explosion-proof O-rings?

A: The explosion-proof O-ring is a specially designed O-ring seal whose main feature is the ability to maintain its shape and performance under extreme pressure and prevent leakage. This characteristic makes the explosion-proof O-ring widely used in a variety of occasions that need to prevent explosion or fire, such as petrochemical, mining, shipbuilding and other industries.

Q: How does ASME B16.34-2020 define standard pressure levels and special pressure levels?

A: All valves that meet the requirements of ASME B16.34-2020, except for the requirements of special pressure class valves and limited pressure class valves, are classified as standard pressure class valves.

Valves that meet all standard pressure levels and pass the inspection required by the special pressure level for threaded and welded ends may be designated as special pressure level valves.

Q: What are the requirements for valve materials? What materials are commonly used to make bodies, caps and RAMS?

A: The safety and reliability of the valve is closely related to the material selected, the valve body, valve cover and gate (disc) is one of the main parts of the valve, directly under the pressure of the medium, the material used must have the mechanical properties and good cold and hot processing properties under the specified medium temperature and pressure.

Valves operating in corrosive media, the material should be resistant to corrosion; For valves working under high temperature and high pressure, the material should have high thermal strength, high toughness and low tempering brittleness; The valve in the coal gasification and synthetic ammonia plant and the valve in the ethylene plant should have excellent low temperature impact toughness, especially the valve with low temperature and certain pressure, and also have a certain ability to resist fracture and crack growth.

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