.~ Pump inlet or pump chamber vented to ambient (e.g., vacuum breaker)
DEFINITION
Classification: 417/306
(under subclass 279) Apparatus in which the flow control means controls a passage communicating with the atmosphere and the inlet of a pump or pumping chamber of a pump and is operative in response to a condition of such pump to admit atmospheric air to the pump inlet or pumping chamber to reduce or destroy the normal vacuum which exists in the inlet or in the pumping chamber during the intake stroke of the pump.
SEE OR SEARCH THIS CLASS, SUBCLASS:
307+, for a pressure responsive bypass or relief valve which permits the discharge of pumped fluid to the inlet of the pump or to ambient in response to a pressure rise in the pumping chamber.
