The solenoid coil is typically larger in a direct acting valve, compared to a pilot operated valve.

In an energized normally closed valve, the inlet pressure is released when the solenoid coil retracts, thereby allowing the fluid to pass through the outlet. Whether that position is normally open or normally closed depends on the application. Direct-acting valves need full power to operate the valve. When there’s no electrical current, the spring coil returns to the default position.

The coil pushes and pulls a shaft and causes the seat of the valve to shift. Solenoids in direct-acting valves open the valve magnetically through direct action, hence the name. Types of solenoid valves Direct-acting valves When selecting a solenoid valve, it is important answer questions about the application and ensure that you are choosing a suitable valve. There are many different types of solenoid valves available, though direct-acting and pilot-operated valves are the two main categories. When activated, solenoids in hydraulic valves and pneumatic valves control the flow of fluid when a fluid power system is in motion. The solenoid activates when an electrical current comes through the wire coil. Solenoid valves convert electrical energy to mechanical energy, which causes a magnetic response.

Electric solenoid valve hydraulic