Hydraulic valve device is to open or close the hydraulic pressure regulating valve drive device, which consists of control, power and implementing agencies composed of three parts. The control part consists of pressure control valve, flow control valve, directional control valve and electrical control system. Power part of the motor or air motor, hydraulic pump, fuel tank and other components, is the electric or pneumatic motor rotation axis of the effective power into hydraulic transmission fluid pressure energy. There are two kinds of actuators for hydraulic valve device, one is hydraulic cylinder actuator, to achieve reciprocating linear motion, and the other is hydraulic motor actuator to achieve rotary motion. The advantages and disadvantages of hydraulic valve device are as follows:

(A) hydraulic valve device advantages

1) simple structure, compact, small size;

2) The transmission is stable and reliable;

3) can get a great output torque;

4) The output torque can be precisely adjusted by constant pressure relief valve, including the opening and closing torque adjustment, and even can be directly reflected by the hydraulic instrument;

5) speed adjustment convenience;

6) In the event of a sudden power failure, the accumulator may still be used to perform one or more power operations. This long-distance pipeline automatic emergency shut-off valve and wellhead discharge valve has a special significance.

(B) the shortcomings of hydraulic valve device

1) The oil temperature is greatly affected by the ambient temperature, the oil temperature changes cause the oil viscosity changes, affecting the operation;

2) piping trouble, easy to produce leakage;

3) Not suitable for the signal generated a variety of computing (such as signal amplification, memory, logic and other calculations) of the occasion.

Hydraulic valve device has its advantages and disadvantages, we use the process to know how to avoid weaknesses, give full play to its advantages, but also to avoid the disadvantages of loss.

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