Measures to reduce or eliminate noise and vibration of pilot operated relief valves

Usually, vibration damping components are added to the pilot valve section.

The vibration damping sleeve is generally fixed in the front chamber of the pilot valve, which is the resonance chamber, and cannot move freely.

There are various damping holes on the vibration damping sleeve to increase damping and eliminate vibration. In addition, due to the addition of components in the resonance chamber, the volume of the resonance chamber decreases, and the stiffness of the oil increases under negative pressure. Based on the principle that components with high stiffness are less likely to resonate, the possibility of resonance can be reduced.

The vibration damping pad is generally coordinated with the resonant cavity and can move freely. There is a throttling groove on both sides of the vibration damping pad, which can produce damping effect when the oil flows to change the original flow situation. Due to the addition of vibration damping pads, a vibration element was added, which disrupted the original resonance frequency. The resonant cavity has added vibration damping pads, which also reduce the volume and increase the stiffness of the oil under pressure to reduce the possibility of resonance.

There are gas storage small holes and throttling edges on the vibration damping screw plug. Due to the presence of air in the gas storage small holes, the air is compressed under pressure, and the compressed air has a vibration absorbing effect, equivalent to a miniature vibration absorber. When the air is compressed in the small hole, the oil is filled in, and when it expands, the oil is squeezed out, which adds an additional flow to change the original flow situation. Therefore, it can also reduce or eliminate noise and vibration.

In addition, improper assembly or use of the overflow valve itself can also cause vibration and noise. Such as a three section concentric relief valve, improper fitting of the three sections during assembly, excessive or insufficient flow during use, abnormal wear of the cone valve, etc. In this case, careful inspection and adjustment, or replacement of parts, should be carried out.