Solenoid Valve, Liquid Line Solenoid & Defrost Solenoid Valve Selection

Solenoid Valve, Liquid Line Solenoid & Defrost Solenoid Valve Selection

Solenoid valve is an on-off control component; cuts off or opens refrigerant flow according to electric signal from controller. Liquid line solenoid valve: before expansion valve; closes automatically when thermostat reaches set temperature, stops liquid supply. Without liquid solenoid valve, refrigerant will continue migrating to evaporator during compressor off period, causing flood-back at next startup. Hot gas defrost solenoid valve: controls high pressure hot gas entering air cooler coil for defrost cycle. Solenoid coil has different voltage options: 24VAC, 220VAC, 380VAC, must match local export power standard. Xiteliduo rack system uses pilot operated solenoid valve for large flow, direct acting type for small capacity circuit. Direct acting: small flow, low pressure difference; pilot operated: big flow, suitable for large refrigeration circuit. Solenoid valve must be installed with flow arrow direction; debris stuck on valve seat causes internal leakage. Valve seat leakage symptom: compressor still pumps down slowly after shutdown, continuous frost on valve outlet side. Refrigeration maintenance & repair judge solenoid leakage when cooling keeps running after room temperature reaches target.

FAQ

1. What is the function of liquid line solenoid valve? Cut liquid supply when thermostat satisfies set temperature.
2. What risk without liquid solenoid valve? Refrigerant migration and liquid flood-back on startup.
3. What solenoid controls hot gas defrost? Defrost hot gas solenoid valve.
4. What is the difference between direct acting and pilot solenoid? Direct acting for small flow; pilot operated for large flow.
5. What is the common fault of solenoid valve? Foreign matter stuck on seat causing internal leakage.
6. What symptom of solenoid seat leakage? Outlet side keeps frosting after closing signal.
7. What voltage options for export solenoid coil? 24VAC, 220VAC, 380VAC.
8. Does solenoid valve need to follow flow arrow? Yes.