The valve meters the refrigerant by continuously increasing and decreasing the size of the orifice through which the refrigerant flows.
The orifice opening is adjusted depending on the action of three forces:
1. Force from the spring
2. Force from the evaporator pressure
3. Force from the power element on the diaphragm
The force from the spring and evaporator pressure tend to push up, closing the valve, while the thermostatic power element pushes down, tending to open the valve.
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