High pressure valve maintenance manufacturers talk about the definition, use and material selection of high pressure valves
Classification:
Release Time：2022-11-30
1. high pressure valve repair manufacturers share the definition of high pressure valve (1) the absolute pressure is lower than 1 atmospheric pressure valve called vacuum valve. (2) pressure 1.6MPa is called low pressure valve. (3) Pressure 2.5~6.4 MPA is called medium pressure valve. (4) pressure 10.0~80.0 MPA called high pressure valve. (5) pressure 100.0MPa is called ultra-high pressure valve.
1.high pressure valveMaintenance manufacturers share the definition of high pressure valve
(1) A valve with a pressure lower than 1 atmosphere is called a vacuum valve.
(2) pressure 1.6MPa is called low pressure valve.
(3) Pressure 2.5~6.4 MPA is called medium pressure valve.
(4) pressure 10.0~80.0 MPA called high pressure valve.
(5) pressure 100.0MPa is called ultra-high pressure valve.
High pressure valves have two operating conditions. One is that the medium is at room temperature, but the pressure is very high (such as valves for oil extraction and water injection in oil fields). The other is that the medium is at high temperature, and the pressure of the main steam system valves used in thermal power plants is also very high. Both of these are "high-pressure valves", but high-pressure valve repair manufacturers believe that the design criteria and material selection only need to consider the strength and stiffness, the latter also consider the strength and creep of the material at high temperatures.
2. high-pressure valve repair manufacturers share the selection of high-pressure valve materials.
1. Pressure parts and control pressure parts.
According to the role of the valve components in the entire valve, the distinction between "pressure components" and "control pressure components" is described in the API 6D "pipeline valve" standard as follows.
Pressure parts refer to parts designed to withstand pipeline media (pressure), such as valves, valves, packing caps, valves, gaskets, bolts, etc.
Control pressure (pressure control components) are components used to cut off or allow the flow of media, such as closures, valves, etc.
2. Shell material.
The shell includes valves, valves and other components, which directly bear the pressure of the medium. As the pressure part of the valve, its material must be able to obtain appropriate mechanical properties and chemical composition under the specified medium, temperature and pressure, and have good cold and hot processing technology.
3. Stem material.
Valve during the opening and closing of the valve under tension, pressure, shear, torsion force, direct contact with the medium, and the relative friction motion of the filler, so the valve material must be specified in the medium, temperature, pressure to ensure sufficient strength and impact toughness, with meet the requirements of corrosion resistance and scratch resistance, and a good process.
4. Sealing surface material
The sealing surface is the key part of the valve, the sealing surface material must have anti-corrosion, anti-erosion, scratch resistance, sufficient extrusion strength (non-pressure), high temperature enough oxidation resistance and heat fatigue resistance, and gas material The linear expansion coefficient is similar, and the processing and welding process is good. For the sealing surface of high-pressure valves, cemented carbide is usually used.
5. Material of pressure fastener
Pressure fasteners mainly refer to the intermediate flange connecting bolts and nuts, which directly bear the pressure of the medium in the valve and play an important role in preventing the leakage of the medium. Therefore, the selected material must ensure sufficient strength and impact toughness under the use pressure and temperature.
3. high-pressure valve maintenance manufacturers talk about packing and gasket materials
Fillers and gaskets for valves are used to prevent media leakage. The filler is used to fill the space between the charging chamber and the valve to prevent the medium from leaking through the valve and the charging chamber space. The gasket is used to fill all the concave and convex parts between the two joint surfaces (such as the valve and the sealing surface between the valve) to prevent the leakage of the medium between the joint surfaces. Therefore, the requirements for the filler material are corrosion, sealing, and low friction coefficient. The requirements for gasket materials are corrosion resistant, and have certain elasticity, plasticity and sufficient strength at operating temperature.
Related News
2026/02/28
Contact Information
+86 27-8970 8339
Address: No.5, Zhengjie, Shuangliu Street, Xinzhou District, Wuhan City, Hubei Province