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RANGE / VALVES & CONTROLS
Valves & controls.
Expansion, solenoid, ball and check valves; pressure, temperature, digital and defrost controls; motor and oil protection; sensors and probes — the control-side parts that keep a system running correctly.
What we stock.
22 items in this line, confirmed on the call for stock and trade price.
Expansion valves
Thermostatic and electronic expansion valves. Capacity and connection on request.
Solenoid valves
Coil operated shut-off valves for liquid and suction lines.
Ball valves
Full port shut-off valves for service isolation.
Service valves
Rotalock and line service valves for compressors and receivers.
Check valves
Non-return valves for discharge and liquid lines.
Pressure regulating valves
Evaporator, crankcase and condenser pressure regulators.
Safety & relief valves
Pressure relief for vessels and high side protection.
Hot gas valves
Hot gas bypass and defrost service valves.
Oil control valves
Oil level regulators and oil line control valves.
Reversing valves
Four-way valves for heat pump duty.
Float valves
High and low side float valves for flooded systems.
Access / charging valves
Access fittings with cap and core for charging and testing.
Pressure controls
High and low pressure cut-outs, manual and auto reset.
Temperature controls
Thermostats for room, coil and product temperature.
Digital controllers
Programmable controllers for refrigeration and cold rooms.
Defrost controllers
Timers and controllers for defrost cycles.
Fan speed controllers
Condenser fan speed regulation for head pressure control.
Compressor controls
Sequencing, capacity and safety controls for compressors.
Oil protection controls
Oil pressure differential and oil failure protection.
Motor protection
Thermal and electronic motor protection modules.
Electrical controls
Contactors, relays, timers and panel control gear.
Sensors & probes
Temperature, humidity and pressure sensors, probes and transducers.
Valves and controls: finding the right part.
Do you stock thermostatic and electronic expansion valves?
Yes. Both thermostatic (TXV) and electronic (EEV) expansion valves are stocked. Tell us the refrigerant, the capacity and the connection size, and Refrigeration Centre will confirm a match.
Can you help identify the right control for an old system?
Yes. Describe the system or send a photo of the old part on WhatsApp, and Refrigeration Centre will match it.
What does a thermostatic expansion valve (TXV) do?
A TXV meters liquid refrigerant into the evaporator so that the gas leaving it keeps a set superheat. Its sensing bulb, clamped to the suction line, opens the valve as the suction gas warms under load and closes it as the gas cools, so the evaporator stays fully fed without liquid reaching the compressor. An electronic expansion valve (EEV) does the same job with a controller, a temperature sensor and a pressure transducer, and reacts faster over a wider range of loads.
How do I choose a replacement expansion valve?
Match five things: the refrigerant the valve is made for, its capacity, the connection type and size (flare or brazed), internal or external equalising, and the orifice size where the body takes interchangeable orifices. The markings on the old valve’s body and powerhead give most of this, so send a photo on WhatsApp and Refrigeration Centre will confirm a match from its thermostatic and electronic valves.
What does a solenoid valve do in a refrigeration system?
It is an electrically operated shut-off valve. In a pump-down circuit the liquid-line solenoid closes when the thermostat is satisfied, the compressor pumps the refrigerant into the condenser or receiver, and the low-pressure control then stops the compressor. When replacing one, match the coil voltage, the connection size and the flow direction marked on the body.
How do I choose a pressure control?
A high-pressure cut-out stops the compressor if the discharge pressure rises too far, for example when a condenser fan fails; a low-pressure control stops it on low suction pressure, from a loss of charge or at the end of a pump-down. Choose a control whose range suits the refrigerant, set it to the equipment maker’s figures, and check the connection and the contact rating. High-pressure safety cut-outs are often manual reset, so that a fault is investigated before the system restarts. Refrigeration Centre stocks high and low pressure cut-outs in manual and auto reset.
What does a reversing (four-way) valve do?
In a heat pump it switches the system between cooling and heating by redirecting the compressor’s discharge gas, so the indoor and outdoor coils swap roles. A small solenoid pilot shifts the valve. A replacement is brazed in, and the valve body must be kept cool while brazing — see protecting valves.
What is a condenser fan speed controller for?
It slows the condenser fan when the outdoor air is cool or the load is light, so the condensing (head) pressure stays high enough for the expansion valve to feed the evaporator properly. It is common on cold rooms and on systems that run all year.
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