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Pneumatic Solenoid Valve in Hydraulic System
Introduction to hydraulic system
The hydraulic system can be divided into power elements, actuators, control elements, auxiliary elements and working medium.
1. Power element transforms the mechanical energy into pressure energy of liquids. The commonly used power element is hydraulic pump.
2. Actuator transforms the pressure energy (pressure p, flow rate q) of liquids into mechanical energy (torque T, speed, or linear motion speed, output force F). Commonly used elements have hydraulic motor and hydraulic cylinder.
3. Control element is used to controls the pressure, flow rate and direction of the liquid, so as to control the output force, velocity and direction of the actuator, overload protection and program control. Commonly used element is hydraulic valve.
The solenoid valve is controlled by electromagnet, which is one kind of hydraulic valve, as a commonly used control component.
Introduction to solenoid valve
The solenoid valve symbols also have fixed symbols and names just like the schematic symbols. It only need to remember simple names and symbols.
There are two international common labeling methods for solenoid valve symbols, namely the digit labeling method and letter labeling method. Their relations are like this:
1 = P = air inlet
5 = R = air exhaust
3 = S = air exhaust
2 = a = working port 1 (air outlet)
4 = b = working port 2 (air outlet)
Position, is also known as working position. Square frame is used to show the working position of valves, and it also shows the working state of solenoid valves.
Way, meas number of interfaces externally connected to square frame. The number of interfaces refers to the number of ways.
Arrows in the box, indicates that the oil or gas lines are connected. However, the arrow direction does not necessarily indicate the actual direction of fluid flow or air flow.
The symbol ┻ or ┳ in the square frame means that the way is not connected.
Pneumatic solenoid valve in hydraulic system
This solenoid valve is a 3-position 4-way pneumatic solenoid valve. Three-position means the valve has three square frames, and arrows in each frame point differently, indicating that they are in different states when they are connected. The pneumatic solenoid valve has external interfaces P, T, A and B, also called four-way, which respectively represents the oil inlet, oil outlet, oil outlet A and oil outlet B. The four ways of pneumatic solenoid valve are fixed at each position. The electromagnet at end a and b provides power supply, and the spring is used for reset.
Generally, a solenoid valve has two or more working positions. One is the normal working position, namely the position of spool without an operation force. The middle position in the above symbol graphy is the normal position of the 3-way pneumatic solenoid valve, simply speaking, it' s also the initial position of valve when it' s not powered on or hasn' t started to operate. The normal position of a 2-position pneumatic solenoid valve with spring reset is the connection state in the frame near the spring. When drawing a system diagram, the oil/gas lines should generally be connected to the normal position of the pneumatic solenoid valve.
When the pneumatic solenoid valve works at the middle normal position, the oil inlet P is not connected, and no oil enters the valve. Oil port A and B are connected with the oil inlet T, the actuators connected with oil port A and B will be in a free state.
When the pneumatic solenoid valve works in the left working position, the oil inlet P connects with the oil outlet B of the actuator, oil enters into the valve and the oil volume in the chamber increases. Oil port A discharges oil to oil outlet T, the oil volume in chamber connected with oil port A decreases. The actuator moves toward the oil port A.
When the pneumatic solenoid valve works in the right working position, the oil inlet P connects with the oil inlet A of the actuator, oil enters into the valve and the oil volume in the chamber increases. Oil port B discharges oil to oil outlet T, the oil volume in chamber connected with oil port B decreases. The actuator moves toward the oil port B.
The hydraulic system can be divided into power elements, actuators, control elements, auxiliary elements and working medium.
1. Power element transforms the mechanical energy into pressure energy of liquids. The commonly used power element is hydraulic pump.
2. Actuator transforms the pressure energy (pressure p, flow rate q) of liquids into mechanical energy (torque T, speed, or linear motion speed, output force F). Commonly used elements have hydraulic motor and hydraulic cylinder.
3. Control element is used to controls the pressure, flow rate and direction of the liquid, so as to control the output force, velocity and direction of the actuator, overload protection and program control. Commonly used element is hydraulic valve.
The solenoid valve is controlled by electromagnet, which is one kind of hydraulic valve, as a commonly used control component.
Introduction to solenoid valve
The solenoid valve symbols also have fixed symbols and names just like the schematic symbols. It only need to remember simple names and symbols.
There are two international common labeling methods for solenoid valve symbols, namely the digit labeling method and letter labeling method. Their relations are like this:
1 = P = air inlet
5 = R = air exhaust
3 = S = air exhaust
2 = a = working port 1 (air outlet)
4 = b = working port 2 (air outlet)
Position, is also known as working position. Square frame is used to show the working position of valves, and it also shows the working state of solenoid valves.
Way, meas number of interfaces externally connected to square frame. The number of interfaces refers to the number of ways.
Arrows in the box, indicates that the oil or gas lines are connected. However, the arrow direction does not necessarily indicate the actual direction of fluid flow or air flow.
The symbol ┻ or ┳ in the square frame means that the way is not connected.
Pneumatic solenoid valve in hydraulic system
This solenoid valve is a 3-position 4-way pneumatic solenoid valve. Three-position means the valve has three square frames, and arrows in each frame point differently, indicating that they are in different states when they are connected. The pneumatic solenoid valve has external interfaces P, T, A and B, also called four-way, which respectively represents the oil inlet, oil outlet, oil outlet A and oil outlet B. The four ways of pneumatic solenoid valve are fixed at each position. The electromagnet at end a and b provides power supply, and the spring is used for reset.
Generally, a solenoid valve has two or more working positions. One is the normal working position, namely the position of spool without an operation force. The middle position in the above symbol graphy is the normal position of the 3-way pneumatic solenoid valve, simply speaking, it' s also the initial position of valve when it' s not powered on or hasn' t started to operate. The normal position of a 2-position pneumatic solenoid valve with spring reset is the connection state in the frame near the spring. When drawing a system diagram, the oil/gas lines should generally be connected to the normal position of the pneumatic solenoid valve.
When the pneumatic solenoid valve works at the middle normal position, the oil inlet P is not connected, and no oil enters the valve. Oil port A and B are connected with the oil inlet T, the actuators connected with oil port A and B will be in a free state.
When the pneumatic solenoid valve works in the left working position, the oil inlet P connects with the oil outlet B of the actuator, oil enters into the valve and the oil volume in the chamber increases. Oil port A discharges oil to oil outlet T, the oil volume in chamber connected with oil port A decreases. The actuator moves toward the oil port A.
When the pneumatic solenoid valve works in the right working position, the oil inlet P connects with the oil inlet A of the actuator, oil enters into the valve and the oil volume in the chamber increases. Oil port B discharges oil to oil outlet T, the oil volume in chamber connected with oil port B decreases. The actuator moves toward the oil port B.
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