Final answer:
On a TXV, the evaporator pressure exerts a Closing influence on the valve.
Step-by-step explanation:
The correct answer is a. Closing.
On a TXV (Thermostatic Expansion Valve), the evaporator pressure exerts a closing influence on the valve. The TXV is a device used in refrigeration and air conditioning systems to regulate the flow of refrigerant into the evaporator coil. As the evaporator pressure increases, it causes the TXV to close, reducing the flow of refrigerant into the evaporator coil.
For example, when the temperature in the evaporator decreases and the pressure of the refrigerant increases, the TXV will close to control the flow rate of the refrigerant into the evaporator coil, ensuring proper cooling of the system.