Pumps – Expansible chamber type – Plural pumping members in single pump chamber
Patent
1975-02-12
1976-04-06
Freeh, William L.
Pumps
Expansible chamber type
Plural pumping members in single pump chamber
1231875R, 417479, F04B 1900, F02H 116
Patent
active
039485897
ABSTRACT:
The primer valve disclosed herein includes a housing having an inlet communicating with a fuel source, an outlet communicating with an engine intake manifold, and a flow passageway extending therethrough from the inlet to the outlet. A port surrounded by a valve seat separates the flow passageway into upstream and downstream portions. Flow of the fuel through the flow passageway is controlled by a diaphragm which is movable relative to the valve seat between port opening and port closing positions and is urged toward the port closing position by a spring. Fuel pressure in the upstream portion of the flow passageway acts on the port closing side of the diaphragm and forces the diaphragm toward the port opening position to permit the fuel to be admitted into the engine intake manifold. As a vacuum condition develops in the intake manifold after the engine is started, and consequently in the port, the spring urges the diaphragm to the port closing position to thereby shut off the flow of the fuel to the engine. A pumping means, preferably integral with the housing, is provided for selectively pressurizing the fuel to the level required to force the diaphragm to the port opening position.
REFERENCES:
patent: 862867 (1907-08-01), Eggleston
patent: 2092685 (1937-09-01), Viel
patent: 2707921 (1955-05-01), Jorgensen
patent: 3048157 (1962-08-01), Gregory et al.
patent: 3145659 (1964-08-01), Sevendsen
patent: 3250224 (1966-05-01), Phillips et al.
patent: 3275305 (1966-09-01), Nutten
patent: 3451383 (1969-06-01), Nelson
patent: 3530842 (1970-09-01), Von Brimer
Freeh William L.
LaPointe G. P.
Outboard Marine Corporation
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