An Air Solenoid Valve Selection Guide

Air Solenoid Valve Selection Guide

Before you choose an air solenoid valve, you need to have enough knowledge about the application. In this article, we have described the critical points for solenoid valves. Here we will determine the ones that are relevant to your application, and use the filter in the web shop to find the pipes that will match your requirements. Moreover, you can use the automatic valve assortment wizard to find the right valve for your application efficiently.

Important Information:

Listed below are the essential guidelines you need to keep in mind before choosing a valve:

A solenoid is extremely sensitive to dirt and only work when it is involved with clean liquids or air

Indirectly controlled valves need a permanent pressure differential; of 0.5 bar to function. Hence, you can’t use indirect operated valves within a closed circuit or systems that have a low inlet pressure. The reason you must use direct and semi direct operated valves is that they have a pressure differential from 0 bar.

Ensure that the medium and temperature go well with the materials of the valve; like the body and seal materials.

Solenoid valves open and close quickly any improper use can cause pressure transients within the systems.

Circuit function

Important Parameters to Know:

Listed below are some of the main settings that you must take into account before selecting the valve:

  • Principle of operation
  • Circuit function
  • Pipe diameter and thread type
  • Orifice, KV-value
  • Flow rate
  • The Medium defines the choice of the valve materials
  • Pressure
  • Temperature
  • Response time
  • Voltage
  • IP-rating

The principle of operation:

There are various types of air solenoid valves, and each comes with different laws of activity:

  • Direct operated
  • Semi-direct operated
  • Indirect operated

It is essential that you be aware of the right operation principle, direct operated valves operate from the 0 bar. Within the valve, there is a small orifice that is sealed off by a plunger with a polymer gasket. If the electromagnet is electrically energized, then the plunger is lifted by force, and the valve will open up. This principle is mostly used for small valves and is suitable for low flow rates. If you want to go for more substantial flow rates, a semi-direct or indirect operated valve will be an appropriate choice.  Either way, both function with the use of medium pressure to open and shut the valve.

The benefit of indirectly operated valves is that they usually control large flows with a small coil and have reduced energy conversion.