Chiller Expansion Valve 

What is an Expansion Valve and What Does It Do?

The expansion valve is the control point between the high-pressure liquid line and the low-pressure evaporator. It drops the refrigerant pressure and injects the right amount into the evaporator according to the cooling load, while maintaining the correct superheat. Proper regulation delivers peak cooling efficiency and prevents liquid returning to the compressor, one of the most damaging faults. A healthy valve is therefore essential to chiller efficiency and stable operation.

Types of Expansion Valves

• Thermostatic (TXV / TEV): uses a sensing bulb and mechanical spring to set flow by superheat; reliable and widely used.
• Electronic (EEV): controls flow with higher precision and faster response via a stepper motor and electronic controller (such as Danfoss EKE), suits a wider range of refrigerants and capacities, and allows remote monitoring, the modern trend in chillers.
• By orifice: fixed-orifice valves, and exchangeable-orifice valves for capacity adjustment.

Browse Expansion valve By Brand & Series

We supply genuine Danfoss valves in the series dedicated to chillers, alongside Sporlan:

• Danfoss TGE: hermetic TXV for all standard refrigerants (R22, R134a, R404A, R407C, R410A, R32), rated 3.5 to 52 TR, the best fit for commercial chillers.
• Danfoss TR6: hermetic design for chillers and rooftop units, for R22 and R410A.
• Danfoss TE 5–55: exchangeable-orifice valve for larger capacities.
• Danfoss ETS (electronic): ETS 5M / 8M / Colibri series for precise injection, with EKE controllers.
• York: Genuine replacement parts compatible with York screw and centrifugal chillers. 

Specs to Check Before Buying

• Refrigerant type (R22 / R134a / R404A / R407C / R410A / R32) determines the valve charge.
• Cooling capacity (TR) matched to the system to avoid an over- or under-sized valve.
• Valve type (thermostatic TXV or electronic EEV) and controller compatibility.
• Orifice (fixed or exchangeable) and size.
• Max operating pressure (MOP), connection type (solder/flare), and size.
• External equalizer connection where required on externally-equalized valves.

How to Choose the Right Expansion Valve ?

Before ordering, prepare: the refrigerant type, the cooling capacity in tons; the valve type (thermostatic or electronic), the connection size and type; the MOP value if applicable, and the old valve's model number (e.g. Danfoss TGE/TR6 series). The wrong capacity or refrigerant causes weak cooling or a frozen evaporator. When unsure, request a quote and our technical team will confirm the match before you buy.

Thermostatic (TXV) vs Electronic (EEV)

Signs of a Failing Expansion Valve

The following signs usually indicate a valve fault:

• Weak cooling despite a healthy refrigerant charge.
• A frozen evaporator or suction line.
• Superheat too high or too low.
• Erratic refrigerant flow or a hunting/fluttering sound.
• Repeated chiller trips or poor performance under high load.

Have superheat and pressure measured by a qualified refrigeration technician before replacement, to confirm the fault is in the valve and not the charge or filter drier.

Why a Genuine Chiller Expansion Valve Matters ?

The expansion valve directly controls cooling efficiency and compressor protection, and a counterfeit or mismatched valve (wrong refrigerant or capacity) can cause freezing or liquid return that damages the compressor. We supply genuine Danfoss and Sporlan valves via authorized suppliers, many with manufacturer or supplier warranty, plus technical support to select the right series and capacity.

For Contractors & Maintenance Projects

We supply expansion valves at project and bulk pricing for contractors, with fast delivery across the Kingdom, and the option to pair the order with our chiller maintenance and repair services. Contact our sales team for contractor pricing.

When replacing a chiller expansion valve, selecting the correct refrigerant, capacity, and valve type is just as important as choosing a genuine product. At Cool.sa, we help contractors, facility managers, and HVAC maintenance companies source the right valve for every application.

• Genuine Danfoss and compatible replacement expansion valves from trusted manufacturers.
• Thermostatic (TXV/TEV) and electronic (EEV) valves for commercial and industrial chillers.
• Technical support to match the correct valve by refrigerant, cooling capacity (TR), and model number.
• Fast delivery across Saudi Arabia.
• Bulk pricing for contractors, maintenance companies, and large projects.
• Assistance identifying replacement valves for Trane, York, Carrier, Bitzer, Hanbell, and other chiller brands.
• Reliable after-sales support and quotation assistance for hard-to-find models.

Frequently Asked Questions

Q1. What's the difference between a thermostatic (TXV) and electronic (EEV) expansion valve?

A TXV uses a sensing bulb and mechanical spring to regulate refrigerant flow, while an EEV controls flow with higher precision and faster response through an electronic controller. Electronic valves support a wider range of refrigerants and capacities and typically provide better energy efficiency.

Q2. How do I know if the expansion valve is faulty?

Common signs include weak cooling, a frozen evaporator, abnormal superheat, erratic refrigerant flow, or repeated chiller trips. A qualified refrigeration technician should confirm the fault by checking system pressures and superheat before replacement.

Q3. How do I choose the valve that matches my system?

Specify the refrigerant type, cooling capacity (TR), valve type (TXV or EEV), connection type and size, and the model number of the existing valve. If you're unsure, request a quote and our technical team will confirm the correct match.

Q4. Which Danfoss series suits a chiller?

The Danfoss TGE thermostatic series covers most refrigerants and capacities up to 52 TR. TR6 valves are designed for rooftop and chiller applications, while ETS is the electronic expansion valve series for precise refrigerant control. We can help you select the right series for your system.

Q5. Are the valves available for different refrigerants?

Yes. Expansion valves are available for refrigerants including R22, R134a, R404A, R407C, R410A, and R32. Be sure to specify your system's refrigerant when ordering to ensure compatibility.