Hydraulic components hydraulic pressure relief valve is a hydraulic pressure control valve in the hydraulic equipment in the main role of the overflow from the constant pressure regulator, unloading systems and safety protection.
main effect
The main requirements for hydraulic components hydraulic relief valve: pressure range of large and small control deviation, a pressure runout small, sensitive, large overload capacity, low noise.
Constant pressure overflow effect: the quantitative pump throttle system, the quantitative pump to provide a constant flow. When the system pressure increases, the traffic demand will decrease. At this point relief valve open, so that excess flow back to tank overflow, inlet pressure relief valve to ensure that the pump outlet pressure constant (often with the pressure fluctuations valve port open).
The role of regulator: the way back to the oil spill in series, back pressure relief, increased steadily moving parts.
Unloading systems: remote port relief valve in series with the solenoid valve spill small flow when the solenoid is energized, the relief valve remote control port to tank, then pump unloading. In this case as unloading relief valve.
A security role: when the system is working properly, the valve closes. Only the load exceeds a predetermined limit overflow opening (system pressure exceeds the set pressure), the overload protection, the system pressure does not increase (usually makes the set pressure relief valve system maximum operating pressure higher than 10% to 20% ).
Usually there are practical applications: for unloading valve, pressure regulator for the remote, for high and low pressure multi-stage control valve for sequence valve, used to generate back pressure (string in the oil return path).
Hydraulic pressure relief valve hydraulic components generally have two structures: a direct acting type relief valve. 2, pilot relief valve.
The main requirement for relief valve: regulating range, small deviations regulator, pressure runout small, sensitive, large overload capacity, low noise.
Precautions
Noise and vibration
Hydraulics elements prone to noise is generally considered pumps and valves, relief valves and solenoid valve again based. Produce a lot of noise factors. Noise relief valve has a flow rate of two kinds of sound and mechanical sound. The flow rate of oil is mainly composed of sound vibrations, a hole, and hydraulic shock causes noise. Mechanical sound is mainly composed of valve parts and other impact and friction causes noise.
