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Refrigeration System
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Expansion Valve
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| 1. |
Construction
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The temperature sensing part of the expansion valve is attached to the outside of the outlet of the evaporator. At the top of the diaphragm that leads to the heat sensing tube, refrigerant gas is contained and the pressure of the gas changes depending on the temperature at the outlet of the evaporator.
The refrigerant pressure at the outlet of the evaporator is applied at the bottom of the diaphragm.
The balance between the force to press the diaphragm up (refrigerant pressure at the outlet of the evaporator + spring force) and the refrigerant pressure of the heat sensing tube moves the needle valve to adjust the refrigerant flow. |
| 2. |
Function, Operation
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| The function and operation of this type are same as that of the box type. |
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(30)
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