The principle of controlling the up-and-down movement of the cylinder with solenoid valve was discovered.

This sawtooth symbol represents the symbol of manual control (with locking position).

The symbol of solenoid valve consists of box, arrow, "T" and characters.

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 path is connected, 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.

Extended data:

Principle: It is a combination of direct-acting and pilot-acting. When there is no pressure difference between the inlet and outlet, the electromagnetic force directly lifts the pilot small valve and the main valve closing piece in turn, and the valve opens.

When the inlet and outlet reach the starting pressure difference, the electromagnetic force guides the small valve, and the lower chamber pressure of the main valve increases and the upper chamber pressure decreases, so that the main valve is pushed upward by the pressure difference; When power is cut off, the pilot valve uses spring force or medium pressure to push the closing piece to move down and close the valve.

Features: It can operate under zero pressure difference, vacuum and high pressure, but it has high power and must be installed horizontally.

Principle: When the power is on, the electromagnetic force opens the pilot hole, and the pressure in the upper chamber drops rapidly, forming a pressure difference between the upper and lower parts around the closing part, and the fluid pressure pushes the closing part to move upward, thus opening the valve; When power is cut off, the pilot hole is closed under the action of spring force, the inlet pressure quickly forms a low-high pressure difference around the closing valve through the bypass hole, and the fluid pressure pushes the closing piece to move downwards to close the valve.

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