Eight Ways to Improve the Life of Regulating Valve
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Release Time：2018-04-18
1, large opening work to extend the life of the method.
Let the control valve start as far as possible on the maximum opening, such as 90%. In this way, cavitation, erosion and other damage occurs on the spool head. With the destruction of the valve core, the flow rate increases, and the corresponding valve is closed a little more, so that the continuous destruction, gradually closed, so that the entire valve core is fully utilized until the root of the valve core and the sealing surface are destroyed and cannot be used. At the same time, the large opening working throttle gap is large, and the erosion is weakened, which is better than the beginning of the valve to work in the middle opening and small opening to improve the service life.1～5times more.
2. DecreaseSIncrease the working opening to improve the life method.
Reducing S, that is, increasing the loss of the system in addition to the control valve, so that the pressure drop on the valve is reduced. In order to ensure the flow through the control valve, the opening of the control valve is inevitably increased. At the same time, the pressure drop on the valve is reduced, so that cavitation and erosion are also weakened.
3, narrow the caliber to increase the working opening to improve the life method.
Increase the working opening by reducing the diameter of the valve. The specific methods are: ① Change a valve with a smaller diameter, suchDN32ReplaceDN25② The valve body shall not be changed, and the valve core valve seat with small valve seat diameter shall be replaced.
4, transfer damage location to improve life method.
Transfer the damaged place to the secondary position to protect the sealing surface and throttle surface of the valve seat
5, growth throttle channel to improve life method.
The simplest way to increase the throttle channel is to thicken the valve seat to increase the valve seat hole and form a longer throttle channel. On the one hand, it can delay the sudden expansion after the flow closure type throttling, and transfer the damage position to keep it away from the sealing surface; on the other hand, it increases the throttling resistance, reduces the degree of pressure recovery, and weakens the cavitation. Some of the valve seat hole is designed to step, wave type, is to increase the resistance, weaken the cavitation. This method is often used in the introduction of high-pressure valves in the device and when the old valves are improved, and it is also very effective.
6, change the flow to improve the life method.
The flow-open type flows in the open direction, and cavitation and erosion mainly act on the sealing surface, causing the root of the valve core and the sealing surface of the valve core valve seat to be quickly damaged; the flow-closed type flows in the closed direction, cavitation and erosion act after throttling, below the sealing surface of the valve seat, protecting the sealing surface and the root of the valve core, and prolonging the service life. When the problem of extending the life of the valve is more prominent, the life can be extended by changing the flow direction by 1 ~2Times.
7, switch to special materials to improve life method
In order to resist cavitation (damage shapes such as honeycomb dots) and erosion (streamlined small grooves), special materials that are resistant to cavitation and erosion can be used to make throttling parts. This particular material has 6YC-1,A4Steel, Stele, hard alloy, etc. For corrosion resistance, materials that are more resistant to corrosion and have certain mechanical and physical properties can be used instead.
8, change the valve structure to improve life method.
To change the valve structure or choose a longer life of the valve approach to achieve the purpose of improving life, such as the selection of multi-stage valves, anti-cavitation valves, corrosion-resistant valves.
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