An integrated capacity control valve for a variable capacity refrigerant
compressor includes an integral pressure sensor that is continuously
coupled to a discharge port of the valve for measuring the refrigerant
discharge pressure. A plunger of the control valve is disposed within a
passage coupling the compressor crankcase to the discharge port, and is
positioned by pneumatic and electric control elements to regulate the
refrigerant suction pressure. The plunger has intersecting axial and
lateral bores that define a continuous passage between the discharge port
and a cavity in which the pressure sensor is retained so that the sensor
is continuously exposed to the discharge pressure regardless of the
plunger position, and refrigerant discharge pressure in the lateral bore
produces a bias force on the plunger that compensates the pneumatic
suction pressure setpoint for a pressure drop between the evaporator and
the suction port of the valve.