The principle and function of pneumatic valve solenoid valve
Pneumatic valve is a common fluid control equipment in industrial pipelines. It is mainly composed of pneumatic actuators and valves. The valve is driven by compressed clean air to control the flow and shut-off of pipeline media. The execution speed is very fast. For quick cut-off applications. Pneumatic valves are generally equipped with various accessories, such as solenoid valves, air source treatment triples, limit switches, positioners, control boxes, etc., to complete local control and remote centralized control. For a two-position valve that only requires opening and closing effects, the solenoid valve is a necessary equipment. The solenoid valve is excited/demagnetized to control the opening/closing of the pneumatic valve.
In the gas circuit (or liquid circuit), the two-position three-way solenoid valve has 1 air inlet (connected to the air source), 1 air outlet (provided to the air source of the target equipment), and 1 exhaust hole ( Generally equipped with a muffler, if you are not afraid of noise, you can not install it. The two-position five-way solenoid valve has 1 air inlet (connected to the air source), 1 positive action air outlet and 1 reverse action air outlet (provided separately for One positive and one negative air source of the target equipment), one positive action exhaust hole and one reverse action exhaust hole (installation muffler). For small automatic control equipment, the air pipe is generally 8~12mm industrial rubber pipe.
Electrically speaking, the two-position three-way solenoid valve is generally single-controlled (ie, single coil), and the two-position five-way solenoid valve is generally double-controlled (ie, double coil). The coil voltage level generally adopts DC24V, AC220V, etc. The two-position three-way solenoid valve is divided into two types: normally closed and normally open. The normally closed type means that the air circuit is broken when the coil is not energized, and the normally open type means that the air circuit is open when the coil is not energized.
(1) Principle of operation of normally closed two-position three-way solenoid valve: When the coil is energized, the gas circuit is connected. Once the coil is de-energized, the gas circuit will be disconnected, which is equivalent to "jogging".
(2) Principle of action of normally open two-position three-way single electronically controlled solenoid valve: when the coil is energized, the gas circuit is disconnected. Once the coil is de-energized, the gas circuit will be connected, which is also "jogging".
Operation principle of two-position five-way dual electronically controlled solenoid valve: when the positive-acting coil is energized, the positive-acting gas circuit is connected (the positive-acting vent has gas), even if the positive-acting coil is powered off, the positive-acting gas circuit is still connected Yes, it will always remain until the reaction coil is energized.
