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Affect the accuracy of flow regulation, with the 
pressure and viscosity related. Stainless steel 
Barrel to form an annular gap, forming tooling 
When energized, the flow of the exhaust gas pressure at 
the top of the piston, a pressure imbalance is sufficient to push the piston
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Close the suction line evaporator, open the discharge 

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valve block hole, see detailed description.
There are fewer where the port is closed. Suction 
line flow is from the evaporator.
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