Hydraulic solenoid valve working principle

Hydraulic solenoid valve working principle

Hydraulic solenoid valve definition

Hydraulic solenoid valve is used to control the fluid a basic component of automation, belongs to the actuator.

Hydraulic solenoid valve is used to control the direction of hydraulic flow, and the mechanical devices in factories are generally controlled by hydraulic cylinders, so it will use hydraulic solenoid valve. So what is the working principle of hydraulic solenoid valve?

Hydraulic solenoid valve working principle

Hydraulic solenoid valve has a closed cavity, there are holes in different locations, each hole connected to different oil pipes, the middle of the cavity is the piston, the two sides are two electromagnets, which side of the magnet coil is energized valve body will be attracted to which side, by controlling the movement of the valve body to open or close the different drain holes, and the inlet hole is always open, the hydraulic oil will enter the different drain pipes, and then through the pressure of the oil to push the piston of the cylinder The piston drives the piston rod, and the piston rod drives the mechanical device, so that the mechanical movement is controlled by controlling the electric current of the solenoid.

The working principle of hydraulic solenoid valve diagram


(1) WE type solenoid valve Figure 1, Figure 2, Figure 3 and Figure 4 are the structure of the WE type solenoid valve with different diameters.

The basic working principle of the solenoid valve is the same. The solenoid controls the different positions of the slide valve spool to change the flow direction of the form fluid. When the solenoid is disconnected, the slide valve is held in the middle position or initial position by the spring (except for pulse type valves). The spool of the slide valve can be moved if the fault check button is pushed.

Figure 1 WE5 type solenoid operated reversing valve structure schematic

1 – valve body; 2 – solenoid (AC solenoid on the left, DC magnet on the right); 3 – slide valve; 4 – reset spring; 5 – push rod; 6 – fault check button; 7 – rubber protective cover


Figure 2 WE6 type solenoid reversing valve structure schematic

1 – Valve body; 2 – Solenoid; 3 – Slide valve; 4 – Reset spring; 5 – Push rod; 6 – Fault check button


Figure 3 4WE10E10/A type wet solenoid reversing valve structure schematic

1 – Valve body; 2 – Wet solenoid; 3 – Slide valve; 4 – Reset spring; 5 – Push rod; 6 – Fault check button


Figure 4 4WE10E10/L…type dry type AC solenoid reversing valve structure schematic

1-Valve body; 2-Dry solenoid; 3-Slide valve; 4-Reset spring; 5-Push rod; 6-Fault check button

Hydraulic solenoid valve model number meaning.

On the hydraulic solenoid valve model, different manufacturers of the model number arrangement is different, here YouQuen give an example of hydraulic solenoid valve model meaning, such as 34BYM-L20H-T, where 34 indicates a 3 position 4 way, B is AC type, Y is liquid, M is slide valve function, L indicates the form of threaded connection, 20 is the nominal diameter, H is the nominal pressure, H indicates high pressure 31.5MPA, T indicates the spring to medium size code. Want more specific model meaning, you can consult the relevant manufacturers.

Hydraulic solenoid valve features.

1. hydraulic solenoid valve external leakage plugging, internal leakage is easy to control, safe to use.

2.hydraulic solenoid valve system is simple, easy to maintain, low price.

3.hydraulic solenoid valve action fast, tiny power, light appearance.

Classification of hydraulic solenoid valve.

Hydraulic solenoid valve is a component used in hydraulic transmission to control the pressure, flow and direction of the liquid. In the hydraulic solenoid valve, the control of pressure is called pressure control valve, the control of flow is called flow control valve, while the control of the pass, break and flow direction is called the direction control valve.

Other classifications of control valves.

1.Directional control valves are divided into one-way valves and reversing valves according to their use.

(1) one-way valve: only allows the fluid in the pipeline one-way on, reverse that cut off.

(2) reversing valve: change the relationship between different pipelines, according to the spool in the body of the working position of the number of two, three, etc.; according to the number of channels controlled two-way, three-way, four-way, five-way, etc.; according to the spool drive manual, motorized, electric, hydraulic, etc.

2.Pressure control valves can be divided into relief valves, pressure reducing valves and sequence valves according to the use.

(1) relief valve: can control the hydraulic system to maintain a constant state when the regulated pressure is reached. Relief valve for overload protection is called a safety valve, when the system fails, the pressure rises to a limit that may cause damage, the valve port will open the relief to ensure system safety.

(2) Pressure reducing valve: It can control the branch circuit to get a stable pressure lower than the main circuit oil pressure. Pressure reducing valve can be divided into fixed-value pressure reducing valve, fixed-difference pressure reducing valve and fixed-ratio pressure reducing valve according to the different functions of the pressure it controls.

(3) Sequence valve: can make an actuator action, and then in order to make other actuators action.

3.Flow control valves are divided into five types according to their use.

Flow control valves are used to adjust the area of the throttle between the spool and the valve body and the local resistance it produces to regulate the flow, thereby controlling the speed of movement of the actuating element. 

(1) speed control valve: in the load pressure changes can maintain the throttle valve inlet and outlet pressure difference for a fixed value.

(2) diverter valve: regardless of the load size can make the same source of oil for the two actuators to get equal flow for the equivalent diverter valve or synchronous valve; and get proportional distribution of flow for the proportional diverter valve.

(3) shunt collector valve: both the function of shunt valve and collector valve.

(4) collector valve: it is to make the flow into the collector valve proportional distribution, the role of the opposite of the diverter valve.

(5) throttle valve: After adjusting the throttle area, the throttle valve can make the load pressure does not change and the speed of movement of the actuating element that does not require high uniformity of movement basically remains stable.


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