Steady voltage pilot operated compound relief valve

The utility model discloses a steady voltage pilot operated compound relief valve, including the pipeline, pipeline intercommunication control valve, the switch of booster compressor is controlled tothe control valve, the utility model discloses when hydraulic pressure in the pipeline was too high, first piston drove the conductor block rebound, and first piston is the shutoff connecting hole nolonger, and hydraulic oil gets into second activity intracavity, because the hydrocushion of lower extreme on this moment second piston, consequently, the downstream of second spring oppression secondpiston, spout hole intercommunication overflow mouth, the unnecessary highly pressurised liquid in the pipeline overflows, reduces the manifold pressure. In the time of the hypotony, first piston moves down under the effect of first spring, and conductor block puts through a binding post, and the power is supplied power to the booster compressor, increases the manifold pressure, plays steady pressure's effect. When the man