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Which is not a pressure or force acting on a TXV diaphragm?
A. Head pressure
B. Evaporator pressure
C. Spring pressure
D. Bulb pressure
The type of pressure or force that does not act on a TXV diaphragm.
Answer to Problem 1RQ
The type of pressure or force that does not act on a TXV diaphragm is Head Pressure.
Explanation of Solution
TXV is a thermostatic expansion valve. It is a component which is used in a refrigeration and air conditioning cycle. It is used for the expansion of refrigerant from the condenser pressure to the evaporator pressure. It controls the amount of refrigerant that which has to be fed from condenser to evaporator. Thermal sensors are installed in this type of expansion device, which maintains a constant superheat in the evaporator.
TXV expansion valve consists of a valve body, a diaphragm, spring, needle and seat, and different types of sensors. The diaphragm which is used in this expansion valve measures the evaporator pressure. The seat in the valve body of a TXV valve is stationary. The needle has an ability to move in the diaphragm. The pressure caused by the bulb acts on the diaphragm and from the other side, its pressure is applied by the evaporator and the spring. The diaphragm moves up and down due to these pressures applied by the different components of TXV. These pressure forces regulate the valve needle at a regular time to open and close.
Therefore, Evaporator pressure, Bulb pressure, and Spring pressure are the active forces which work to move the needle in a TXV diaphragm.
Conclusion:
The pressure or force that does not act on a TXV diaphragm is Head Pressure.
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Chapter 24 Solutions
Refrigeration and Air Conditioning Technology - Package
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