Types of HVAC Expansion Valves and When to Use Them

Expansion valves are a crucial component of any HVAC system, controlling the flow of refrigerant into the evaporator coil and helping regulate system efficiency. But not all HVAC expansion valves are the same – and choosing the right one for the job depends on the system type, application, and performance goals. At SquarePeg, we carry a range of high-quality expansion valves to suit your next installation or repair.

Here’s a quick guide to the types of expansion valves we offer and when to use them.

STANDARD THERMOSTATIC EXPANSION VALVE (TXV)

A standard TXV uses a thermal bulb to sense the temperature of refrigerant leaving the evaporator and adjusts flow accordingly. It’s a time-tested option for maintaining consistent superheat and protecting the compressor.

When to use it: Ideal for most residential and light commercial systems, a standard TXV improves efficiency and offers better load adaptability compared to fixed orifice systems. It’s great for systems where refrigerant control and energy savings matter.

Featured product: Rheem Thermostatic Expansion Valve.

Find out more in this blog: Understanding Expansion Valves in HVAC Systems.

NON-BLEED TXV KITS

Non-bleed TXV kits completely shut off refrigerant flow when the system cycles off, offering tight refrigerant control. These kits often include everything needed for a clean, accurate installation.

When to use it: Choose a non-bleed TXV in systems where efficiency and temperature control are a priority. This type of expansion valve is commonly used in newer systems and retrofit applications where compressor flooding needs to be avoided.

Featured product: Goodman Amana R-410A Non Bleed Thermal Expansion Valve Kit.

Check out this video for more info: Expansion devices | HVAC,

BLEED PORT TXV

Bleed-port TXVs allow a small amount of refrigerant to bypass the valve even when closed. This helps equalize pressure across the valve during off cycles, making restarts easier on older or single-speed compressors.

When to use it: These valves are best for systems that don’t use a hard-start kit or have older compressor designs. Use them when you want to maintain pressure balance and reduce startup strain.

Featured product: Rheem Bi-Metal Thermal Expansion Valve with Bleed Port.

We recommend this blog for further reading: What Are the Different Types of Expansion Valves.

HEAT-PUMP TXV

Specifically designed for heat pumps, these HVAC expansion valves handle the refrigerant flow reversal that occurs between heating and cooling modes. They’re engineered for stable operation across both functions.

When to use it: Use a heat-pump TXV in systems where performance needs to remain steady year-round, no matter the season. They’re essential for heat pumps that need precise control during mode shifts.

Featured product: Advanced Distributor Products Thermal Expansion Valve For Heat Pump.

Need help choosing the right HVAC expansion valve? The SquarePeg team is here to help you find the best expansion valves for your project – and we carry the trusted brands professionals rely on every day.