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Hydraulic Valve Flow Control
Sep 26, 2017

Hydraulic valve is a kind of operation automation components with pressure oil, it is with pressure oil pressure valve control, usually with electromagnetic valve combination, can be used for remote control of hydropower station, oil, gas, water piping system on and off. Often used for clamping, controlling, lubrication, etc. There are direct action and leading, multi-purpose lead.

It is used to reduce and stabilize the oil pressure of a certain branch in the system, often used in clamping, controlling, lubrication and so on. There are straight, leading and superposition.

Direction control: it is divided into one-way valve and reversing valve. One-way valve: only allow the fluid to be connected one way in the pipe, and the reverse is cut off. Reversing valve: changing the relationship between different pipelines. According to the valve core work in the valve body count two, three, etc. According to the number of channels controlled by two, three, four, five, etc. Split moving, maneuvering, electric, liquid and so on according to the valve core drive mode. Figure 2 is the working principle of three four-way directional valve. P is for oil supply, O for oil return, and A and B are outlet for the actuator. When the valve core is in the middle position, the entire oil outlet is cut off and the actuator is not moving; When the valve core is moved to the right, P and A, B and O; When the valve core moves to the left, P and B, A and O. In this way, the execution element can be positive and backward.

In the late 1960s, the hydraulic proportional control valve was developed on the basis of several hydraulic control valves. Its output (pressure, flow) can change continuously with the input signal. The electro-hydraulic proportional control valve is divided into two types: electro-hydraulic proportional pressure control valve, liquid proportional flow control valve and electro-hydraulic proportional direction control valve.

Pressure control

It is divided into overflow valve, reducing valve and sequence valve. Overflow valve: can control the hydraulic system to maintain a constant state when the pressure is reached. The overflow valve for overload protection is referred to as the relief valve. When the system fails and the pressure is raised to the limit of potential damage, the valve port will open and overflow to ensure the safety of the system. Pressure reducing valve: can control the branch circuit to get the stability pressure lower than the main circuit. Pressure reducing valve according to its control function is different, can divide again setting pressure reducing valve (output pressure constant value), or worse, pressure reducing valve (input and output pressure constant value) and constant ratio pressure reducing valve (keep certain proportion between input and output pressure). The order valve: can make an actuator (such as a hydraulic cylinder, hydraulic motor, etc.) to move the action of other actuators in order. Pump pressure to drive the hydraulic cylinder 1 movement, at the same time, through the role of the inlet opening sequence valve on the area of A, when the hydraulic cylinder motion completely into 1, pressure, role in the area of A upward thrust is greater than the spring after the setting of the valve core is rising oil outlet and inlet are interlinked, make the hydraulic cylinder motion.

Flow control

The flow rate is adjusted by using the throttle area between the valve core and valve body and the local resistance generated by it, thereby controlling the movement speed of the actuator. Flow control valves are divided into five types. The throttle valve: after adjusting the area of the throttle, the motion speed of the actuator which can make the load pressure change less and the motion uniformity is not high is basically stable. Speed regulating valve: the pressure difference of the throttle valve can be maintained when the load pressure changes. In this way, after adjusting the area of the throttle, no matter how the load pressure changes, the speed regulating valve can keep the flow constant through the throttle valve, thus making the moving speed of the actuator stable. The same type of flow valve can be obtained from two actuator components of the same oil source, regardless of the size of the load. The proportional flow rate of the proportional distribution valve. In contrast to the diverter valve, the flow of flow to the collector valve is allocated proportionally. Integrated flow valve: both a diversion valve and a collector valve.

Ask for

1) flexible action, reliable action, small impact and vibration at work, small noise, long service life.

2) when the fluid flows through the hydraulic valve, the pressure loss is small; When the valve port is closed, the sealing property is good, the inside leakage is small, no leakage.

3) the amount of control (pressure or flow) is stable, and the change in the external disturbance is small.

4) compact structure, easy to install, debug, use, maintain convenient and universal

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