The cylinder has been selected. How to choose solenoid valve?

Standard usage in automation industry, taking SMC as an example:

Single acting cylinder, select two-position three-way solenoid valve. Double-acting cylinder, generally choose two-position five-way valve. Double-acting cylinder, special purpose:

Three-position five-way intermediate drain valve, the intermediate cylinder can be pulled at will, which is convenient for debugging; Three-position five-way medium pressure valve, with air pressure on both sides of the middle piston, can realize multi-position stop of the cylinder; Three-position five-way intermediate sealing valve with fully enclosed intermediate valve body is used for vertical cylinder, and the cylinder will not fall off immediately when power is cut off and gas is cut off.

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.

Pilot solenoid valve

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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