.~.~ Having serial control of inlet or discharge flow path
DEFINITION
Classification: 417/496
(under subclass 490) Apparatus in which in addition to the control of pump fluid by a pumping member controlled port there is a separate means to control the pump fluid in either the inlet or outlet flow path for the pump; i.e., the pump fluid is serially controlled by both means either going to or coming from the pump chamber.
(1) Note. The separate means may be a second pumping member controlled port. The disclosed use of many of the devices in this subclass is that the pumping member closes and seals an inlet or discharge port when idle to prevent leakage.
