![]() This way, a relatively small solenoid can be used to switch the valve.Mono-stable valves are built with one coil, bi-stable valves with two coils. The compressed air in this cylinder pushes against the piston and actuates the solenoid to switch the valve. The pilot valve delivers compressed air to a small air cylinder inside the valve. This pilot valve is a small direct operated 3/2-way valve. In order to do this an additional pilot valve is used. ![]() In case of indirect operation, the spool is not directly actuated by the solenoid.The valve uses the system pressure to move the spool. Mono-stable valves return to their default position, which is accomplished by spring force. The valve closes or opens by moving the spool or poppet. With direct operated valves, the spool or poppet is moved directly by the actuator. The valve’s main parts are the following: housing, seals, poppet (or spool) and an actuator The sealing mechanism of the valves can be a poppet or a spool. Designģ/2-way valves are available in several designs. With indirect operation, the valve uses the inlet pressure to help switching the valve state. Symbols of 3/2-way pneumatic solenoid valvesģ/2-way valves can be actuated by different means such as:įurthermore, the valves can be direct operated or indirect operated.
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