Complete the following questions and click on the orange button on the bottom of the page to directly view valves that match your requirements.
What type of liquid or gas? Please select the best matching answer:
For use with seawater a valve with a stainless steel or plastic housing is recommended. Common brass is not suitable. Seawater is a chloride solution, and this removes the zinc from the brass (dezincification). Over time the brass turns green and becomes brittle.
Suitable seal materials include NBR, EPDM, FKM and PTFE.
Note that solenoid valves are suitable for clean liquids only. If necessary, install a filter on the inlet side of the valve.
For clean water up to 80°C a valve can be chosen with a brass or plastic housing.
Suitable seal materials are NBR, FKM and EPDM. EPDM is the most sustainable choice.
For hot water and steam, a valve housing of brass, or possibly stainless steel, is recommended.
For the seals can be chosen from EPDM and PTFE. Other materials such as NBR or FKM are not suitable.
Pay attention to the maximum allowed temperature of the medium. Most of the solenoid valves are specified with a maximum permitted temperature of 130°C.
Solenoid valves cannot be used in combination with fluids or gases that are contaminated with sand, rust or other particles. These particles can clog the moving parts of the valve or block the little canals in the valve, causing the solenoid valve to stop functioning. In some cases, this can be solved with a filter on the inlet side of the solenoid valve.
Electrical ball valves are less sensitive to dirt than solenoid valves and therefore preferred for slightly contaminated fluids. Particles of sand or other particles can increase wear and reduce the lifespan. Therefore, it is also advisable to install a filter.
Compressed air often contains oil. As a result, EPDM is unsuitable as membrane. Suitable seal materials are FKM, NBR or PTFE.
Diesel and hydraulic oil are non-corrossive by nature. The valve housing can be brass, stainless steel or nylon.
Both FKM and NBR are suitable seal materials. FKM is the most sustainable option.
For use with gasoline, the valve body can be brass, stainless steel or nylon.
The best choice for the seals is FKM. NBR is moderately suitable for gasoline, EPDM is unsuitable.
Voor C02 (carbon dioxide) in liquid or gas state, a valve housing from brass or stainless steel is possible. Nylon is not suitable for liquid CO2.
Choose a seal of FKM, EPDM, NBR or PTFE. PTFE is the best material. Check if the temperature of the carbon dioxide doesn't exceed the valve specifications. In case of a large pressure drop, it is recommended to design the system in such a way that the pressure drop takes place at sufficient distance from the valve. This will prevent very low temperatures in the valve.
Choose a valve housing of stainless steel, brass or nylon. Note that brass and nylon are less suitable in combination with certain detergents. Therefore, select a stainless steel valve or make sure that the valve materials are compatible with the chemical composition of the detergent.
Choose a seal made of EPDM or PTFE. NBR or FKM are not suitable in most cases.
Choose a seal from EPDM or FKM. NBR is not suitable. Pay attention to the maximum allowed temperature of the medium; at temperatures above 80° it is recommended to choose EPDM instead of FKM. FKM reacts with hot water.
Check if the used medium and temperature are compatible with the materials of the valve (housing, seals). You can use the chemical resistance chart.
How many ports does the valve have?
Is the valve Normally Closed (opens with voltage on), or Normally Open (closes with voltage on)?
For the vast majority of the applications normally closed valves are used. Normally Closed means that the valve is closed when de-energized, and opens when the valve is electrically energized. Normally Open works the opposite way; the valve is open in de-energized state, and closes when the valve is electrically energized.
What is the function?
Choose the right function with help of the diagrams. The flow directions between ports 1, 2 and 3 of the valve are indicated with arrows. The left square is the de-energized state, and the right square is the electrically energized state. Note that this choice is required for solenoid valves. Electrical ball valves can be set up to function with each of the four diagrams.
What is the differential pressure over the valve? Choose the situation that best matches the application:
Indirect operated solenoid valves need a pressure differential of at least 0.5 bar. (Semi-)Direct operated solenoid valves operate from 0 bar. In case of Situation A, both indirect and (semi-)direct valves can be used. Indirect operated valves can usually control a larger flow rate than direct operated valves with a similar electrical power. The reason is that the medium pressure is used to operate the valve. Electrical ball valves are also possible in Situation A.
Indirect operated solenoid valves need a pressure differential of at least 0.5 bar. (Semi-)Direct operated solenoid valves operate from 0 bar. For Situation B, indirect operated solenoid valves are not possible. Only direct and semi-direct operated solenoid valves or electrical ball valves are possible.
Indirect operated solenoid valves need a pressure differential of at least 0.5 bar. (Semi-)Direct operated solenoid valves operate from 0 bar. In Situation C, the pressure is usually too low to reach a 0.5 bar pressure differential. Therefore, only direct and semi-direct operated solenoid valves and electrical ball valves are possible.
What is the maximum pressure? Choose the lowest possible value.
Most valves have ports with female thread. What size do you need?
The majority of the valves feature female pipe thread (British Standard Pipe Parallel). The size is indicated in inches. Please note that this doesn't refer to the pipe diameter. With the right fitting, the most pipe types can directly be connected.
How fast is the valve required to change state?
Solenoid valves have a response time that varies from 10 milliseconds for small direct operated valves, to several hundreds of milliseconds for larger indirect operated valves. Electrical ball valves open and close in several seconds. They are not suitable for situations where a fast response time is required.
Solenoid valves have response times varying from 0.01s up to 1.5 seconds. Electrical ball valves open and close slower in several seconds. For some situations this can be an advantage, for example to prevent water hammer.
Solenoid valves have a response time that varies from 10 milliseconds for small direct operated valves, to several hundreds of milliseconds for larger indirect operated valves. Electrical ball valves open and close in several seconds.
What voltage is the power supply?
Choose the correct voltage. The most valves are available with different coils for AC and DC.