Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1998-05-13
2000-03-14
Hepperle, Stephen M.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
417159, 417188, 417189, 417191, F16K 1122
Patent
active
060358815
ABSTRACT:
A checkvalve (1) is provided with an inlet which can be connected to an operating system requiring a negative pressure, e.g. to a braking force amplifier (17), an outlet (3) which can be connected to a negative-pressure system producing a negative pressure, a main air channel (4) connecting the inlet and the outlet in a fluid manner and enabling an air flow in the direction of the outlet, a first checkvalve (9) installed in the main air channel (4), a single outside-air channel (5) which branches off downstream of the first checkvalve (9) and lets out into the atmosphere and a cross-sectional narrowing (7) in the manner of a venturi pipe (6), a venturi channel (8) connecting the cross-sectional narrowing (7) upstream of the first checkvalve (9) to the main air channel (4) and a second valve (10) located between the inlet (2) and the cross-sectional narrowing (7) in the main air channel (4) or in the venturi channel (8). A shut-off valve is located before or after the cross-sectional narrowing (7) in the outside-air channel (5) and is actuated as a function of the system pressure (p.sub.S) prevailing in the operating system in such a manner that the connection to the atmosphere is established when a predetermined target pressure (p.sub.Soll) is exceeded and is interrupted when the pressure drops below this pressure.
REFERENCES:
patent: 1180017 (1916-04-01), Davenport
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patent: 3042077 (1962-07-01), Waddington et al.
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patent: 4211200 (1980-07-01), Rocchio et al.
patent: 4913192 (1990-04-01), Vavra
patent: 5108266 (1992-04-01), Hewitt
patent: 5188141 (1993-02-01), Cook et al.
patent: 5291916 (1994-03-01), Kloosterman et al.
Buratowski Thaddaus
Emmerich Ulf
Hepperle Stephen M.
Walter Alfmeier AG Prazisions-Baugruppenelemente
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