Solenoid Valves

Solenoid VavleA pressure relief solenoid valve is an electromagnetically-operated device that regulates the flow of liquids or gases. Typically these are controlled automatically by a pressure switch. There are two main parts to a solenoid valve: a solenoid coil that convert electrical energy into mechanical energy to open or close the valve and a diaphragm to control flow through the valve. Some valves add a spring, which snaps the valve back into the open or closed position when the coils are off. Hydraulic valves will also use a plunger for flow control. A simpler solenoid ball valve is used in pneumatic systems. These use a rubber seal around the ball to ensure leak-proof operation.

Solenoid valves can be tested by cycling them on and off. If you do not hear an audible click, the valve may not be closing and opening properly. This means either the solenoid is faulty, or it isn’t receiving adequate power due to an electrical short. Most solenoid valves are built with a two-piece housing that can be unbolted for repair.

If the diaphragm becomes clogged, it can prevent the valve from fully opening or closing, allowing gas or fluids to leak through the valve. Most of the time this can be fixed by removing the valve and cleaning out any debris around the diaphragm and diaphragm seat. Hydraulic valve plungers may also need to be cleaned, but if they still leak, they may need to be replaced. Some plungers are kept in place by a small spring, which can be easy to lose during repairs.

Repairing the valve’s plunger or diaphragm treats the problem, but not the symptom: The system should be inspected to find out why debris reached the valve. Filters can be installed upstream of the valve, catching debris. These filters are much cheaper than replacement valves.

Solenoid Valves

A pressure relief solenoid valve is an electromagnetically-operated device that regulates the flow of liquids or gases. Typically these are controlled automatically by a pressure switch. There are two main parts to a solenoid valve: a solenoid coil that convert electrical energy into mechanical energy to open or close the valve and a diaphragm to control flow through the valve. Some valves add a spring, which snaps the valve back into the open or closed position when the coils are off. Hydraulic valves will also use a plunger for flow control. A simpler solenoid ball valve is used in pneumatic systems. These use a rubber seal around the ball to ensure leak-proof operation.

Solenoid valves can be tested by cycling them on and off. If you do not hear an audible click, the valve may not be closing and opening properly. This means either the solenoid is faulty, or it isn’t receiving adequate power due to an electrical short. Most solenoid valves are built with a two-piece housing that can be unbolted for repair.

If the diaphragm becomes clogged, it can prevent the valve from fully opening or closing, allowing gas or fluids to leak through the valve. Most of the time this can be fixed by removing the valve and cleaning out any debris around the diaphragm and diaphragm seat. Hydraulic valve plungers may also need to be cleaned, but if they still leak, they may need to be replaced. Some plungers are kept in place by a small spring, which can be easy to lose during repairs.

Repairing the valve’s plunger or diaphragm treats the problem, but not the symptom: The system should be inspected to find out why debris reached the valve. Filters can be installed upstream of the valve, catching debris. These filters are much cheaper than replacement valves.