Apr 11, 2011
Relief valve causes of common failures
Relief valve in use, a common fault with noise, vibration, and pressure regulator valve radial clamping failure and so on.
Hydraulics components in the noise-prone and generally considered to be the pump valve, relief valve and electromagnetic valve turned around so the main valve. A lot of noise factors. Relief ball valve with flow noise and mechanical sound of two kinds of sound. Mainly by the oil flow rate of sound vibration, cavitation and hydraulic impact of noise generated by other reasons. Mechanical sound from the valve in the main part of the impact and noise generated by friction and other factors.
Pilot-type relief valve pilot valve part is a vibration prone position shown in Figure 3. In case of overflow when the high-pressure, pilot valve axial opening is very small, only 0.003 ~ 0.006 cm. Flow area is small, the wheel loader rate is high, up to 200 m / s, can lead to uneven pressure distribution, the poppet valve radial force imbalance vibration. Another cone and cone seat valve produced by processing ellipticity, dirt port pilot valve and regulator spring deformation, stick, cone valve can also cause vibration. Therefore, the pilot valve is generally believed that noise vibration source location fastener.
Because elastic element (spring) and the moving mass (cone valve) the existence, constituting a condition of oscillation, while the pilot valve chamber was underway before the role of a resonant cavity, so the cone valve can lead to the occurrence of vibration of the valve after resonance and noises, occurred more commonly associated with noise, there is intense pressure to ramtron fram.
