Solenoid valve is an industrial equipment controlled by electromagnetism. It is an automatic basic component used to control fluid. It belongs to actuator, not limited to hydraulic and pneumatic. It is used to adjust the direction, flow, speed and other parameters of the medium in the industrial control system. The solenoid valve can cooperate with different circuits to achieve the desired control, and the control accuracy and flexibility can be guaranteed. There are many kinds of solenoid valves, different solenoid valves play a role in different positions of the control system, the most commonly used one-way valve, safety valve, direction control valve, speed control valve, etc.
What is the “position” and “on” of the solenoid valve?
“Several positions” refers to several working states of the valve, which can be said to be several positions. If there are symbols of pneumatic components, several of the squares (with arrows or T lines inside) representing the valve body on the drawing symbols are several positions
“Several connections” means that there are several points (points intersecting arrow line and t line) on one of the squares
Several way: if the valve is classified according to the number of switching ports (including input port, output port and exhaust port), there are two-way valve, three-way valve, four-way valve, five-way valve, etc
Several positions: the working position of the valve core is abbreviated as “position”. The valve with three working positions of the valve core becomes a three position valve. When the valve core is in the middle position, each port is in the closed state, which is called the middle closed type. When all the output ports are connected with the exhaust ports, it is called the middle relief type. If all the output ports are connected with the input ports, it is called the middle pressurization type
“On” and “position”, “on” and “position” of solenoid valve are important concepts of pneumatic reversing solenoid valve. Different “on” and “position” constitute different types of pneumatic reversing solenoid valve. Generally speaking, “two position valve” and “three position valve” refer to that the valve core of reversing valve has two or three different working positions
The so-called “two-way valve”, “three-way valve” and “four-way valve” refer to two, three, four different interfaces on the valve body of the reversing valve which can be connected with different oil pipes or gas stations in the system. Different oil / gas channels can only be channeled through the valve port switch when the valve core is displaced
The meaning of graphic symbols is generally as follows:
(1) A box is used to indicate the working position of the valve, and a few boxes indicate several “positions”;
(2) The arrow in the box indicates that the gas path is in the on state, but the arrow direction does not necessarily indicate the actual direction of gas flow;
(3) The symbol “┻” or “┳” in the box indicates that the access road is blocked;
(4) If there are several interfaces connected outside the box, it means several “connections”
The selection of solenoid valve should first follow the four principles of safety, reliability, applicability and economy, and then it should be selected according to six aspects of site conditions (i.e. pipeline parameters, fluid parameters, pressure parameters, electrical parameters, operation mode and special requirements).