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A relief valve solenoid is an electromagnetic actuator used to remotely or automatically open and close relief valves. It consists of a wirewound coil and a ferrous metal plunger. When activated, the magnetic field attracts the plunger, opening the valve. Solenoids are used in applications where the valve is far away, hazardous, or inaccessible. They are simple, effective, and reliable. When the pressure in the system drops, the valve spring returns the plunger and valve mechanism to the closed position.
A relief valve solenoid is an electromagnetic actuator used to remotely or automatically open and close relief valves used as pressure relief devices. Solenoid is a widely used type of actuator consisting of a wirewound coil and a ferrous metal plunger. When the solenoid is activated, an appropriately rated electric current is passed through the coil creating a strong magnetic field around it. This field attracts the metal plunger making it move rapidly towards the coil, the movement is used to open the valve. When the current is interrupted, the valve spring closes the valve mechanism and returns the plunger to its neutral position.
Relief valves are often included in piping systems and pressure vessels as a means of relieving internal pressure in the system. When the system is subjected to operating pressure, the valve remains closed, opening only when the tank or piping system requires venting to relieve pressure. Many vent valves are operated manually via a cam lever or screw mechanism. In applications where the valve is located far away from operator stations or where the environment around the valve or the contents of the system are hazardous, a remote solution such as a vent valve solenoid is for obvious reasons. The same is true for unmanned applications or valves located in small enclosed spaces where the valve is inaccessible and must open and close automatically.
One of the most viable methods of achieving this remote actuation is the air valve solenoid. Simple, effective and reliable, solenoids are the obvious choice for a wide variety of similar applications. Consisting of little more than a coil of wire and a ferrous metal plunger, the solenoid is simplicity itself while producing a surprisingly powerful and reliable actuating motion.
In the case of a typical blow off valve solenoid, the plunger will connect to the spring loaded valve stem via a series of connections. When an operator or automated system sends an electric current to the solenoid coil, a powerful magnetic field is produced around it which pulls the metal plunger. This causes the plunger to move rapidly towards the spool, the motion being transferred via the linkage to the valve stem, opening it in the process. When the pressure in the system has dropped to the required level, the coil current is cut off, allowing the valve spring to return the plunger and valve mechanism to the closed position. This resets the relief valve solenoid in preparation for the next pressure cycle.
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