.~.~ Longitudinally spaced inlet and discharge sidewall ports
DEFINITION
Classification: 417/498
(under subclass 490) Apparatus comprising one port for providing inlet of pump fluid to the pump chamber and another port for providing discharge of pump fluid therefrom, each of said ports being formed in a pump chamber sidewall portion and longitudinally spaced from each other, said ports
individually providing the sole path for inlet and discharge of pump fluid and being controlled by the covering or uncovering thereof by the pumping member or element carried thereby.