What is the pressure valve? What does it work? What characteristics? Why the short life of high pressure valve? However, Jingyi valve tells us: high pressure valve is pointed to the workers said the pressure of PN for 10 ~ 80Mpa valve, is the control of fluid delivery system components, with the deadline, regulation, diversion, to prevent reflux, regulation, diversion or overflow relief functions, shorten its life mainly in the following three aspects.
First reflected in the erosion, the throttle opening, high-speed flow of medium, with a strong momentum, it can quickly will spool, out of the seat surface streamline body, this is the so-called erosion. Especially in the small opening, the throttle gap is small, maximum throttle speed, erosion has reached the maximum value, the huge scour will adjust the service life of the valve are dropped, this is why the pressure valve to avoid the work of a small opening reason.
The second is the cavitation, high-speed flow of medium in the throttle, the speed can be increased dramatically, according to the principle of conservation of energy, pressure will drop sharply, when the pressure is lower than the saturation vapor pressure (Pv), the liquid will split the gas, the formation of gas-liquid two phase flow, this is the so-called flash; when the medium flows through the throttle mouth, throttle velocity decreased gradually, the pressure begins to restore stage by stage, when the pressure to a larger than the saturation vapor pressure, the bubble burst back into the liquid, the burst pressure, strong shock wave, so that the role of valve core, valve seat surface material impact into a honeycomb of holes, and cause vibration and noise, this is called cavitation. Cause flash pressure conditions are: △ P = FL (P1 - PV), where FL is the pressure recovery coefficient, P1 for the valve before the pressure, Pv and temperature of saturated vapor pressure of population.
The last is the relationship between primary and secondary cavitation and erosion, the small opening in the work, the erosion is the principal contradiction; a large opening in the work, cavitation is the main contradiction. So, when the user is used to avoid the work of a small opening; high-pressure valve manufacturer must have a good anti-cavitation measures, otherwise, regulating valve quickly cause cavitation damage.
The article explains:
1, this is the network editor reproduced or the release, the release of the article aims to convey more information to visitors.
2, involves the content of the works, copyright and other issues, please contact with the network in 30 days, we will make the appropriate treatment for the first time! The relevant copyright matters please contact: 13515194999
3, this article please indicate are from: Jiangyin OuLeiShi valve valve repair factory www.olschina.com
4 other links:
Valve repair valve repair valve repair equipment valve grinding machine import valve repair valve repair valve repair
|
