What do you mean, how many air valves are connected? How many air valves are connected together?

"On" and "On" of hydraulic valve are important concepts of pneumatic reversing solenoid valve. Different "on" and "on" constitute different types of pneumatic reversing solenoid valves.

The so-called "two-position valve" and "three-position valve" usually mean that the spool of the reversing valve has two or three different working positions.

"Two-way valve", "three-way valve" and "four-way valve" mean that there are two, three and four ports on the valve body of the reversing valve that are not connected with different oil pipes or gas pipes in the system, and the front "several" can only communicate between different oil circuits/gas paths through the switch of the valve port when the valve core shifts. It can be said that the valve has several working states, which would be better understood if there were symbols of pneumatic components. The following "several links" means that there are several points (points intersecting the arrow line and the T line) on one of the squares, which are several links. The meanings of graphic symbols are usually as follows:

(1) The working position of the valve is represented by a box, and several boxes represent several "positions";

(2) The arrow in the box indicates that the oil circuit is in a connected state, but the direction of the arrow does not necessarily indicate the actual direction of liquid flow;

(3) The symbol "┻" or "┳" in the box indicates that the passage is impassable;

(4) If there are several interface connections outside the box, it means several "connections";

(5) Generally, the oil inlet/air inlet of the valve connected with the system oil supply circuit or gas is represented by the letter P; The oil return/air return port connected between the valve and the oil return/air circuit of the system is denoted by T (sometimes denoted by O); The oil port/gas port where the valve is connected to the actuator is indicated by A, B, etc. Sometimes l is used to represent the oil spill on the graphic symbol;

(6) The reversing valve has two or more working positions, one of which is the normal position, that is, the position when the valve core is out of control. The middle position in the graphic symbol is the normal position of the three-position valve. The two-position valve with spring return takes the channel state in the box close to the spring as the normal position. When drawing the system diagram, the oil/gas path should generally be connected to the normal position of the reversing valve.