(under the class definition) Apparatus in which the pump fluid is liquid, the pump including port or valve other than the ports or valves necessary to the normal operation of pump, said port or valve being positioned in the pump chamber or pump fluid conduit to permit the escape of gases from the pump or conduit or to permit the filling of the pump or conduit with liquid for priming purposes.
(1) Note. When the venting or filling means comprises a valve, the valve may not be of the type which cyclically controls the supply or discharge of pump fluid as a consequence of operation of the pump.
SEE OR SEARCH THIS CLASS, SUBCLASS:
199.1+, for diverse pumps one of which may be a priming pump for another.
425, for plural pumping members one of which is power driven and one manually operated.
434, for a separate port or noncyclic valve for draining a pump chamber or conduit. 440+, for a separate selectively controlled noncyclic valve for a purpose other than venting or filling a pump portion.
443+, for a pressure responsive distributor opened in response to pumping member position.
446, for means for selectively holding a pressure responsive distributor open.
447, for a pressure responsive distributor which is continuously biased open.
493+, for a pumping member controlled inlet or outlet port including plural cyclically controlled inlet or outlet flow paths.
