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