When selecting a solenoid valve, the primary concern is to determine whether the pressure of the fluid matches the valve operating pressure.
Differential pressure is usually required to operate a diaphragm solenoid valve. For this reason, if you put a solenoid valve under a tank filled with water flowing from 1 mm (= 0,1 bar), there will be no pressure difference of 0,5 bar. The pressure to be generated is 0.1 bar and less than 0.5 bar. Pilot controlled solenoid valve is not recommended in this case. If this water tank is installed at 5 mm height, the inlet pressure of the valve is 0.5 bar. If the outlet side of the valve is open to the atmosphere or if the outlet side in the pipe is not pressurized, then a differential pressure of 0,5 bar is formed. Pilot operated solenoid valve will work here. If a differential pressure of 0,5 bar is not formed, a different solution is needed. In this case, a direct acting solenoid valve may be recommended. If the direct acting solenoid valve lead does not suffice, try to produce a solution with the difference pressureless S1020 Series developed in the pilot operated solenoid valves in low-fluid processes of 0.5 cups.
What should be considered when choosing a solenoid valve?
The temperature of the fluid passing through the vane is important because if the temperature or the kind of fluid is not suitable for the sealing element (NBR, FKM, EPDM, PTFE, etc.)
- Body material of the valve
- Orifice diameter on the body
- Operating voltage of the coil
The coil voltage on the valve is also very important. Applying an electric voltage different from the coil voltage negatively affects valve operation.
- Connection dimension of the solenoid valve;
When selecting the right valve, you should also look at the valve size. Pilot controlled solenoid valves are usually manufactured in 3/8 “, 1/2”, 3/4 “, 1”, 11/4 “, 11/2”, 2 “, 3” sizes. Direct draw solenoid valves are usually 1/8 “and 1/4” in size. However, 3/8 “or 1/2” can also be made if needed.
- Type of fluid, and the position of the solenoid valve;
Clean fluid should be used in solenoid valves. Particulate fluid is not used. The particles adhere to the sealing element and disrupt the operation of the valve, causing the valve fluid to escape. A weld in the pipe may come in and prevent the sealing element on the core that closes the solenoid valve orifice from functioning. For such dirty fluid processes, it is recommended to clean the filter or fluid for the active carbon. Another problem is that the fluid is calcified. If the fluid is a calcined fluid, the lime particles that fill up between the shell and the nucleus over time can block the shell and its work. For this reason, it is very important whether the solenoid valve is liquid-lime or not for life.
Solenoid valves are long-life valves. But in the first selection process conditions and the solenoid valve’s tag values and technical specifications must match.