Single-controlled solenoid valve
That is, there is only one electromagnetic coil, which is generally used in 2-position 3-way solenoid valves. The coil voltage level usually adopts DC24V, AC220V, etc. Two-position three-way solenoid valves are divided into two types: normally closed type and normally open type. The normally closed type means that the air path is disconnected when the coil is not energized, while the normally open type means that the air path is open when the coil is not energized. The operating principle of the normally closed two-position three-way solenoid valve: When the coil is energized, the air path is connected. Once the coil is de-energized, the air path will be disconnected, which is equivalent to "intermittent operation". The operating principle of the normally open two-position three-way single electrically controlled solenoid valve: When the coil is energized, the air path is disconnected. Once the coil is de-energized, the air path will be connected. This is also known as "intermittent operation".
Double-control solenoid valve
There are two electromagnetic coils, which are generally used in two-position five-way solenoid valves. The operating principle of two-position five-way double-control solenoid valves: When the positive action coil is energized, the positive action air path is connected (there is air at the positive action air outlet). Even if the positive action coil is de-energized, the positive action air path remains connected and will remain so until the reverse action coil is energized. When the reverse action coil is energized, the reverse action airway is connected (there is air in the reverse action air hole). Even after the reverse action coil is de-energized, the reverse action airway remains connected and will remain so until the forward action coil is energized. This is equivalent to "self-locking". Based on this characteristic of the two-position five-way double-controlled solenoid valve, when designing the electromechanical control circuit or programming the PLC, the solenoid valve coil can be made to act for 1 to 2 seconds, which can protect the solenoid valve coil from being easily damaged.
Above is the difference between double-control solenoid valves and single-control solenoid valves. To learn more related information, visit https://www.joosungauto.com/.
