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Everything You Need to Know About Thermostatic Expansion Valve

 thermostatic expansion valve

Everything You Need to Know About Thermostatic Expansion Valve

thermostatic expansion valve is a measuring device that controls the amount of refrigerant that enters an air conditioner evaporator, i.e., it turns from a liquid to a gas. It allows for more coherent heat transfer by regulating the refrigerant flow.

It is designed to improve the air conditioner’s efficiency. It also helps keep your air conditioning system from breaking down.

The controlled release verifies that all the refrigerant has been turned to vapor when it leaves the evaporator and enters the compressor.

However, it can cause damage to your unit when the liquid refrigerant is allowed to enter the compressor.

Here, in this blog, we discuss everything you need to know about the thermostatic expansion valve.

Common glitches of a malfunctioning thermostatic expansion valve~


 thermostatic expansion valve


The most common glitch of a malfunctioning thermostatic expansion valve is dirt or water making its way into the system and causing the valve to either get stuck open or closed.

When it gets stuck open, the evaporator is immersed with refrigerant, but when it gets stuck closed, not sufficient refrigerant makes it into the evaporator.

These both result in the same thing; the system will not be able to produce an adequate amount of cooled air, and warm air will be coming through the vents.

Signs of a malfunctioning thermostatic expansion Valve~

1. Warm air from vents

2. Frost on the vents

3. Air conditioner compressor always on

4. Inconsistent airflow

5. Air conditioner system failure

Working on the thermostatic expansion valve~


 thermostatic expansion valve


The functional working of this is to hold a constant evaporator superheat. When set and operating correctly, It will keep the evaporator active throughout its entire length.

Springs, bellows, and pushrods control the conventional thermostatic expansion valve. The spring force is a closing force on the thermostatic expansion valve.

The evaporator pressure, which acts under the thermostatic element’s part, is also a closing force.

Finally, an opening force is the remote bulb force, which works on top of the thermostatic element’s role.

There is a liquid pressure from the fluid line, which acts on the face of the needle valve and has a tendency to open the valve.

However, this force is canceled out when using a balanced port thermostatic expansion valve.

Together, these forces sustain a constant evaporator superheat in a refrigeration system.

There are no electronic devices associated with a conventional thermostatic expansion valve.

Wrap Up

It is essential to hire a thermostatic expansion valve technician who knows what they’re doing and can diagnose issues properly.

An expert knows what signs to look for and ensures a proper diagnosis.

We have the Institute of Inspection Cleaning and Restoration Certificate that makes us the most reliable technicians that offer the finest air duct cleaning services.

Contact Air Super clean for everything you need to know about the thermostatic expansion.

We have a highly skilled and experienced team that guarantees you the most technically gifted and professional services.

For more details, you can call us any time!



Post Tags : HVAC system