What is a hydraulic power unit?

A driving device that uses hydraulic pressure to open and close or adjust valves. It consists of three parts: control, power and actuator.
Hydraulic device refers to a driving device that uses hydraulic pressure to open and close or adjust valves. It consists of three parts: control, power and actuator.
Chinese name: hydraulic device
Composition: pressure control valve, flow control valve
Advantages: simple structure, compact, small size
Disadvantages: troublesome piping, easy to leak
Hydraulic device is a driving device that uses hydraulic pressure to open and close or adjust valves. It consists of three parts: control, power and actuator. The control part consists of pressure control valve, flow control valve, direction control valve, etc. and electrical control system. The power part consists of electric motor or pneumatic motor, hydraulic pump, oil tank and other parts, which converts the effective power on the rotating shaft of electric or pneumatic motor into fluid pressure energy of hydraulic transmission. There are two types of actuators, one is a hydraulic cylinder actuator, which realizes reciprocating linear motion; the other is a hydraulic motor actuator, which realizes rotary motion. The advantages and disadvantages of hydraulic devices are as follows:
(I) Advantages of hydraulic valve devices
1. Simple, compact structure and small size;
2. Smooth and reliable transmission;
3. A large output torque can be obtained;
4. The output torque can be accurately adjusted through the constant pressure relief valve, including the adjustment of the opening and closing torque, and can even be directly reflected through the hydraulic instrument;
5. Convenient speed adjustment;
6. When the power is suddenly interrupted due to an accident, the accumulator can still be used for one or several power operations. This is of special significance for the automatic emergency shut-off valve and wellhead blowdown valve of long-distance pipelines.
(II) Disadvantages of hydraulic valve devices
1. The oil temperature is greatly affected by the ambient temperature. The change in oil temperature causes the viscosity of the oil to change, affecting the operation;
2. The piping is troublesome and prone to leakage;
3. It is not suitable for various operations on the signal (such as signal amplification, memory, logical judgment, etc.)