.~.~ Crankcase forms stage or interstage flow path
DEFINITION
Classification: 417/255
(under subclass 254) Apparatus in which the successive reciprocating pumping members are driven by a rotary shaft having crank means or the like thereon connected to the pumping members, a housing (i.e., crankcase) in which the shaft operates and (1) the housing together with a pumping member constituting one of the pumping units or (2) at least a portion of the fluid acted upon by a prior stage passing into the housing before being acted upon by a subsequent stage.
