What Is a Hydraulic Solenoid Valve?

Hydraulic solenoid valve is an automatic basic component used to control fluids and belongs to actuators; it is not limited to hydraulic and pneumatic. Solenoid valve is used to control the direction of hydraulic flow. The mechanical devices of the factory are generally controlled by hydraulic cylinders, so solenoid valves are used.

Hydraulic solenoid valve

Hydraulic solenoid valve is an automatic basic component used to control fluids and belongs to actuators; it is not limited to hydraulic and pneumatic. The solenoid valve is used to control the direction of hydraulic flow.

Hydraulic solenoid valve is an automatic basic component used to control fluids and belongs to actuators; it is not limited to hydraulic and pneumatic. The solenoid valve is used to control the direction of hydraulic flow.

(1) The external leakage is blocked, and the internal leakage is easy to control and safe to use.

(2) The system is simple, easy to maintain, and inexpensive.

(3) Fast action, small power and lightweight appearance.

Hydraulic solenoid valve refers to the components used in hydraulic transmission to control the pressure, flow and direction of liquid. Among them, the pressure control valve is called a pressure control valve, the flow control valve is called a flow control valve, and the on, off and flow directions are called directional control valves.

1. Pressure control valve is divided into relief valve, pressure reducing valve and sequence valve according to the purpose.

(1) Overflow valve: It can control the hydraulic system to maintain a constant state when it reaches the set pressure. The relief valve used for overload protection is called a safety valve. When the system fails and the pressure rises to the limit value that may cause damage, the valve port will open and overflow to ensure the safety of the system.

(2) Pressure reducing valve: It can control the branch circuit to obtain a stable pressure lower than the main circuit oil pressure. Pressure reducing valve can be divided into constant pressure reducing valve (output pressure is constant value), constant difference pressure reducing valve (input and output pressure difference is constant value) and constant ratio reducing valve according to the pressure function it controls. (Keep a certain ratio between input and output pressure).

(3) Sequence valve: After one actuator (such as hydraulic cylinder, hydraulic motor, etc.) can be activated, other actuators can be activated in sequence. The pressure generated by the oil pump first pushes the hydraulic cylinder 1 to move, and at the same time acts on the area A through the inlet of the sequence valve. When the hydraulic cylinder 1 is completely completed, the pressure increases, and the upward thrust acting on the area A is greater than the setting of the spring. After the value, the valve core rises to connect the oil inlet and the oil outlet, and the hydraulic cylinder 2 moves.

2. Flow control valve, which adjusts the flow by adjusting the area of the orifice between the valve core and the valve body and the local resistance generated by it, so as to control the movement speed of the actuator. The flow control valve is divided into 5 types according to the purpose.

(1) Throttle valve: After adjusting the area of the throttle orifice, the movement speed of the actuator which can make the load pressure change little and the movement uniformity requirement not high basically remains stable.

(2) Speed regulating valve: When the load pressure changes, the inlet and outlet pressure difference of the throttle valve can be maintained at a fixed value. In this way, after the area of the throttle opening is adjusted, the speed regulating valve can keep the flow rate through the throttle valve constant regardless of the change of the load pressure, thereby stabilizing the movement speed of the actuator.

(3) Diverter valve: Regardless of the size of the load, the same amount of flow or synchronous valve can be used to make two actuators of the same oil source get equal flow; the proportional flow divider is the one that gets proportional flow.

(4) Collector valve: The effect is opposite to that of the diverter valve, so that the flow into the collector valve is distributed in proportion.

(5) Diverting and collecting valve: It has both functions of diverting valve and collecting valve.

3. The directional control valve is divided into one-way valve and directional valve.

(1) Non-return valve: only allow fluid to be connected in the pipeline in one direction, and cut off in the reverse direction.

(2) Reversing valve: change the on-off relationship between different pipelines, according to the working position of the valve core in the valve body, divided into two, three, etc .; according to the number of controlled channels, divided into two, three, Four-way, five-way, etc .; manual, motorized, electric, hydraulic, etc. according to the valve core driving method.