Way and Position in solenoid valve

- Jun 26, 2019-

1. The concept of "way" and "position"


"Way" and "position" are important concepts of the solenoid valve. Different "way" and "position" constitute different types of pneumatic reversing solenoid valves.


“Position” refers to the number of positions of the spool of the reversing valve, which means that the valve has several working states. For example, a two-position valve or a three-position valve means that there are two or three different working positions.


"Way" refers to the number of interfaces on the body of the reversing valve that are different and connected to different tubing in the system. Different oil passages can only be communicated through the switch of the valve port when the spool is displaced. For example, a three-way valve or a four-way valve means that the valve body has three or four ports when the reversing valve is operated, that is, the valve is a three-way valve or a four-way valve.



2. Representation of "way" and "position"


"Several ways" means that the reversing valve has several working states. It can usually be represented by the number of squares representing the valve body. For example, a two-position valve or a three-position valve will have two or three squares on the map.


The "several positions" can be determined by the number of points on the square in the normal position of the reversing valve and the total number of intersecting arrow lines and T lines.


3. Graphic symbol meaning

1. Use the box to indicate the working position of the reversing valve. There are several boxes indicating that there are several positions.

2. The arrow inside the box indicates that the oil path is on, but the direction of the arrow does not necessarily indicate the actual direction of oil flow.

3. Use "T" to indicate that the oil circuit is unreachable.

4. There are several points outside the box to indicate a few passes.

5. The reversing valve inlet is usually indicated by P, the return port is indicated by T, and the unloading port is indicated by L.

6. When drawing the reversing valve system diagram, the oil circuit is usually drawn in the normal position box.

7. When the reversing valve has two or more positions, there must be a normal position, that is, the position when the spool is not subjected to the operating force. The normal position of the two-position valve is the box near the spring, and the normal position of the three-position valve is the middle block.



4. Directional valve naming example

Two-position two-way valve


                                   2位2通

Three-position two-way valve


                                   2位3通

Three-position two-way valve

 

                                     3位5通

Five-position two-way valve


                                      3位5通