Solenoid valves are increasingly used in daily work. If we were asked to determine the number of ports on a solenoid valve simply by its appearance, most people probably wouldn't be able to tell. Below, we'll share a method to correctly identify the number of ports and positions of a solenoid valve. The method is as follows:
The meaning of position and port number of a common solenoid valve:
The "on" and "off" positions of a solenoid valve are important concepts in pneumatic directional solenoid valves. "On" and "off" constitute different types of pneumatic directional solenoid valves. The commonly used terms "two-position valve" and "three-position valve" refer to valve spools having two or three different operating positions.
Working principle of three-position five-way electromagnetic commutation:
As the name suggests, a three-position five-way valve has three working positions and five ports. The three-position five-way electric touch valve is a center-venting type; "p" indicates a medium-pressure type; the center-sealing type designation is omitted. Explosion-proof solenoid valve is indicated after the order number. "EX".
The terms "two-way valve," "three-way valve," and "four-way valve" refer to directional control valves with two, three, and four ports on their bodies that connect to different oil or air lines in the system. These different oil/air lines can only communicate by interrogating the shift time port's switch. To see if this adjustment has a working status, you can say "position." If there are pneumatic component symbols, for better understanding, the square representing the valve body in the diagram (with arrows or T-lines) indicates the number of ports. "Number of ports" indicates the number of points on the square (the points where the arrows and T-lines intersect).
The valve core of a solenoid valve has three positions. A three-position solenoid valve has two coils, which we'll call coil A and coil B for now. When AB is not energized, the core is in one position, and the valve core moves to the second position. When energized, the valve core reaches the third position. So there are a total of three positions. Please note that there are three types of three-position five-way solenoid valves, referring to the different states of the valve core when AB is not energized: center-closed, center-open, and center-closed. In practice, the closed three-position five-way valve is used.
(1) In the diagram of a solenoid valve, the working position of the valve is represented by a box, and the number of boxes represents the "position";
(2) The arrows in the boxes in the solenoid valve diagram indicate that the oil circuit is connected, but the direction of the arrows does not necessarily indicate the actual direction of fluid flow;
(3) The symbol "up" or "-" in the solenoid valve diagram box indicates that the passage is blocked;
(4) How many interfaces are connected to the outside of the frame in the solenoid valve diagram, and how many "through" connections are represented?
(5) In solenoid valve diagrams, the oil inlet/air inlet connecting the valve to the system's oil or gas supply circuit is generally represented by the letter 'p'; the oil return/air return port connecting the valve to the system's oil/air return circuit is represented by '+' (sometimes 'o'); and the oil/air ports used to connect the valve and actuators are 'ab', etc. Sometimes, '1' is used in the graphic symbol to represent an oil leak port;
(6) A directional valve has two or more operating positions, one of which is the normal position, i.e., the position when the return core is not subjected to operating force. The middle position in the graphic symbol is the normal position of the three-position valve. For a two-position valve with spring return, the normal position is the state of the passage near the spring frame. When drawing a system diagram, the oil/air circuit should generally be connected to the normal position of the directional valve.
Each product category has different product types, and these different product types make products more competitive. Solenoid valves play an increasingly important role in many fields, but facing increasing market pressure, these products require more attention and focus.
