.~ Having means for holding pressure responsive distributor open
DEFINITION
Classification: 417/446
(under subclass 437) Apparatus in which the means for controlling pump fluid to or from the pump chamber includes valve means of the type which normally opens or closes responsive to a pressure differential between the pump chamber and an inlet or discharge conduit for cyclically controlling pump fluid for the pumping operation and includes means for moving and holding said valve in open position irrespective of said pressure differential.
SEE OR SEARCH THIS CLASS, SUBCLASS:
297+, for an expansible chamber pump having a cyclically operated valve in which the operation of said valve is modified responsive to a pump condition.
443+, for a pressure responsive distributor which is moved to open position responsive to pumping member position.
SEE OR SEARCH CLASS
137, Fluid Handling, 522+, for a direct response line condition responsive valve having external means for biasing valve open.
