What does the equalizer line do on a Txv?
Just so, why is the Equalising line in the thermostatic expansion valve?
The effects of severe pressure drop can be offset by using an externally equalised thermostatic expansion valve. The external equalisation line reads the lower pressure at the evaporator outlet (3.9bar and 0°C saturation temperature) and transfers this to the underside of the diaphragm.
Similarly, how does a Txv work? The Thermal Expansion Valve (TXV) is installed to control the flow of refrigerant into the evaporator in response to the cooling load. TXV's measure the superheat at the outlet and react to this by increasing or decreasing the amount of refrigerant flowing into the evaporator to try and maintain a constant superheat.
Subsequently, one may also ask, what is an external equalizer Txv?
An internally equalized TXV uses evaporator inlet pressure to create the 'closing' force on the valve. An externally equalized valve uses the evaporator outlet pressure, thereby compensating for any pressure drop through the evaporator. Capping the equalizer line will prevent the valve from operating properly.
How do you know if your expansion valve is bad?
Symptoms of a Bad or Failing Expansion Valve (Orifice Tube)
- AC system performing worse than usual and blowing warm air. One of the first symptoms of a problem with the AC expansion valve or orifice tube is an underperforming AC system.
- Frost on AC evaporator or coming from the vents.
- AC compressor constantly running.