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The Thermostatic Expansion Valve (TXV): Not Your Average Valve

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As a result of more stringent energy efficiency regulations in recent years, thermostatic expansion valve (TXV) has become increasingly popular. Today, an indoor TXV is included with most gas furnaces and air conditioning systems on the market -- although it should be noted that these do typically have to be installed separately. If you have a system that did not come with a TXV, it is also possible to buy one separately and install it yourself. For other HVAC components, like air handlers, you may be asked to choose whether or not you want to add a TXV to your order.

In order to decide whether a TXV makes sense for your system, it is important to know how they work. Read on for a basic overview of how a TXV functions in an HVAC system.

What A TXV Does (and Does Not) Do

The TXV makes it possible to precisely regulate the rate at which the liquid refrigerant is transferred into the evaporator in an HVAC system. By making it possible to control the flow of the refrigerant, a TXV offers two major benefits:

  • Improving the efficiency of the system
  • Preventing “floodback” -- that is, keeping excess liquid refrigerant from flowing back into the compressor after it has entered the evaporator

There are a lot of misconceptions about what a TXV can do, so it is important for buyers to understand the limitations of this valve from the outset. The TXV only regulates the flow of the liquid refrigerant between the compressor and the evaporator. It does not have the capacity to control air temperature, humidity, suction pressure, or head pressure.

The TXV works to regulate the flow of the liquid refrigerant by reacting to changes in two variables: the pressure in the evaporator, and the temperature of the refrigerant when it is being transferred out of the evaporator. The design of the mechanical design of the TXV makes it possible for the liquid refrigerant flow to be optimized based on the temperature and pressure conditions at any given moment.

Weighing the Decision to Add a TXV

Like so many features that boost the efficiency of an HVAC system, the TXV comes with an upfront cost. At the same time, a higher efficiency heating or cooling system will ultimately lower your energy bills and eventually pay itself off. And of course, it’s also better for the environment. You may also get a discount if you are adding a TXV to an order, rather than buying it on its own. You should keep these considerations in mind when deciding whether or not it makes sense to add a TXV to a new order or purchase one for an existing system.
You can buy a standalone TXV from National Air Warehouse, or you can get a system where a TXV may be included. Contact us today to find out more about how our products can help meet your heating and cooling needs!

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