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Unlike direct acting solenoids, internally piloted valves work with system pressure to aid control, rather than against it. This is because flow can be limited, and they consume a large amount of electrical power. In a N/O valve, the opposite happens – the spring keeps the spool in the open position.ĭirect acting solenoid valves are of limited use and are only seen in about 10% of applications. When the solenoid is charged, the magnetic field causes the solenoid rod to lift, moving the spool and allowing air to pass through to the other side. With direct acting, N/C valves, the solenoid rod is attached to a spool and kept in place by spring. They do not require any line pressure to work, and can operate in vacuum conditions. In the case of direct acting solenoid valves, the force generated by the solenoid must be greater than the force exerted by the pressure of the air. Solenoid piloted valves can be further divided into internally or externally piloted valves, and are sometimes referred to as servo-assisted solenoid valves. What are the different types of solenoid valve?Īs we shall see, solenoid valves can be split into the following broad categories: direct acting or solenoid piloted.
#PNEUMATIC ELECTRIC SOLENOID VALVE INSTALL#
Solenoid valves eliminate the need for manual or pneumatic control of a pneumatic circuit and only require an electrical input (and air pressure for piloted valves) to operate, this makes them easy to program and install in a wide variety of applications.