The compressor head, internal and/or external discriminator, and manifold
design in general utilize ball valves on the suction and discharge of a
cylinder head in the recovery of refrigerant liquid and/or vapor. The
device facilitates the flashing of liquid refrigerant pumped to the
compressor which, in turn, assists to cool the compressor head. The
flashing of liquid refrigerant to vapor also deters liquid transfer into
the compressor enhancing performance thereof. The vapor passages within
the discriminator, cylinder head and/or manifold are sized for receipt of
spring actuated ball's to open and/or close the vapor passages during
suction and/or discharge of refrigerant vapor or liquid by the
compressor.