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For larger flow rates, a semi-direct or indirect operated valve is recommended. This principle is often used for small valves and is suitable for small flow rates. If the solenoid (electromagnet) is electrically energized, the plunger is lifted by the electromagnetic force and the valve opens. In the valve there is a small orifice which is sealed off by a plunger with a polymer gasket. Direct operated valves operate from 0 bar. It is important to choose the right operation principle. Indirect operated (pressure differential required, normally at least 0.5 bar).Semi-direct operated (operating from 0 bar).There are different types of solenoid valves, each with different principles of operation: Medium (defines the choice of valve materials).This is a list of some key parameters that you should take into account when selecting a valve: Improper use can cause pressure transients in the system (water hammer). Solenoid valves open and close fast (between around ms).Make sure that the used medium and temperature are compatible with the materials of the valve, such as body and the seal materials.Direct and semi-direct operated valves operate with a pressure differential from 0 bar. Therefore, you can not use indirect operated valves in a closed circuit or systems with a low inlet pressure.

Note that indirectly controlled solenoid valves require a permanent pressure differential of around 0.5 bar to function properly.Solenoid valves are very sensitive to dirt and only work with clean liquids or air.Keep these guidelines in mind before choosing a valve. These are the most important guidelines when selecting a solenoid valve. Alternatively, you can use the automatic valve selection wizard to quickly find the right valve for your application. Determine which are relevant to your application, and use the filter in the webshop to find the valves that match your requirements. This guide describes the key parameters for solenoid valves. Before choosing a type of solenoid valve, sufficient information about the application must be gathered.