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In a submerged pump system for pumping liquid from a well or vessel the vertical pipe through which the liquid is pumped by a submerged impeller pump is typically fitted at its upper end with an air valve. The air valve vents air from the pipe to atmosphere upon pump start up, then closes so that on

In a submerged pump system for pumping liquid from a well or vessel the vertical pipe through which the liquid is pumped by a submerged impeller pump is typically fitted at its upper end with an air valve. The air valve vents air from the pipe to atmosphere upon pump start up, then closes so that only water passes through a check valve to a pipe system and subsequently allows air to re-enter the pipe when the pump stops. A special throttling valve associated with the air valve restricts the outward rate of flow of air to atmosphere to thereby reduce the rate of the rising liquid and thus the shock of this liquid on the air valve and on the check valve but allows essentially unrestricted re-entry of atmospheric air to thereby allow the vertical pipe to fill with air rapidly. One form of throttling valve includes a valve plug mounted for axial movement into and out of a vent opening and spring-biased into the opening. The plug is a loose fit within the opening, so that during venting the air passes through the restricted space between the plug and the wall of the opening. Upon re-entry of air the force of the entering air moves the valve plug against the spring bias and out of the opening in the direction of air flow whereby the opening is no longer restricted by the plug.

대표청구항 ▼

In a pump system for pumping liquid from a body of liquid upwardly through a pipe having a lower end in communication with the discharge of a submerged pump: an air and vacuum valve connected to said pipe on the discharge side of said pump, said valve having an outlet for venting pressurized air fro

In a pump system for pumping liquid from a body of liquid upwardly through a pipe having a lower end in communication with the discharge of a submerged pump: an air and vacuum valve connected to said pipe on the discharge side of said pump, said valve having an outlet for venting pressurized air from said pipe during pump start-up, valve means for preventing flow of pumped liquid through said outlet and for allowing re-entry of atmospheric air in response to a reduced air pressure in said pipe which results when the pump stops operating; and an air throttling valve having a housing, the housing having an inlet in flow communication with said outlet of said air and vacuum valve and an exhaust opening in flow communication with the atmosphere; and means mounted within said housing for restricting the flow of air to a first flowthrough passage through said housing to atmosphere, said means being responsive to the occurrence of a reduced air pressure in said housing to remove said flow restriction thereby allowing atmospheric air to pass through a second, larger flowthrough passage from said exhaust opening of said housing to said air and vacuum valve, whereby air is allowed to flow through said valve means and said air throttle valve during pump start-up.