Solenoid Valve Tutorial

For those who aren’t too familiar with solenoid valves and their function, let’s start with the basics.  A solenoid valve is an electro-mechanical device that when energized or de-energized either opens or closes a valve orifice.  It is designed to control the flow of air, water, oil, gas or steam.  Here’s some handy terminology that is helpful in understanding solenoid valves:

De-energized: Electrical current is not applied to the solenoid valve.

Energized: Electrical current is applied to the solenoid valve.

Normally Closed: Valve is in the closed position when de-energized.

Normally Open: Valve is in the open position when de-energized.

Pressure (psi): Force exerted by an object over a specific area.

Flow: Continuous movement of a media in a specific direction.

Maximum Operating Pressure Differential (M.O.P.D.): The difference in pressure between the inlet and the outlet sides of the valve, against which the valve can safely operate. If the valve outlet pressure is unknown, be conservative and regard the supply pressure as the M.O.P.D.

Minimum Operating Pressure Differential: The pressure required to open a valve and keep it open.

If you need to order a solenoid valve and don’t have an existing part number, there are a few things you need to know to make sure you get the right one for your application:

Type of media:  air, water, steam, gas, or oil

Valve body: bronze or stainless steel

Voltage:  A/C or D/C voltage requirement

Electrical operation: normally open or normally closed

Valve size: pipe size or flow requirements

Valve line pressures:  inlet and outlet pressures

Operating temperatures: maximum operating temp

Valve type: 2 way, 3 way, or 4 way

Check back soon to get some solenoid valve troubleshooting tips.


One Response

  1. i like to know function of solenoid valve via drawing and practical action with slow motion

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