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US 4,353,385 AGranted
Diaphragm pressure regulator
AssigneeRobert Bosch GmbH
InventorsWolfgang Maisch, Klaus-Jurgen Peters, Michael Wissmann, Karl Gmelin
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AssigneeRobert Bosch GmbH
InventorsWolfgang Maisch, Klaus-Jurgen Peters, Michael Wissmann, Karl Gmelin
Estimating the term…
A diaphragm pressure regulator is proposed which serves to regulate a fluid pressure in a system having fluid flowing through it, and in particular to relate the fuel pressure in a fuel injection system. The diaphragm pressure regulator includes a valve diaphragm, which cooperates with a valve seat. The valve diaphragm separates a spring chamber having a system pressure spring from a system pressure chamber, into which the valve seat, which is axially displaceable and is supported in an axial bearing point, protrudes and which communicates with the fluid to be regulated. The end of the valve seat remote from the valve diaphragm is embodied as a valve plate and protrudes into a collection chamber, in which it opens a sealing seat toward a return flow line to a greater or lesser extent. A closing pressure spring engages the valve plate and urges the valve seat in the direction of the valve diaphragm. When the valve diaphragm is lifted up from the valve seat, fluid flows via a conduit in the valve seat into the collection chamber. A throttle gap is provided between the system pressure chamber and the collection chamber, by way of which throttle gap fluid can flow out to the collection chamber, when the fluid system is shut off, until such time as the valve plate is pressed in a sealing fashion against the sealing seat and blocks the return flow line, which takes place below a predetermined fluid pressure.
A diaphragm pressure regulator for regulating the fuel pressure in a fuel injection system, having a movable valve element embodied as a valve diaphragm and a valve seat arranged to cooperate with said valve diaphragm, characterized in that said valve diaphragm separates a spring chamber from a system pressure chamber, said system pressure chamber arranged to communicate with the fluid to be regulated, and said valve diaphragm further arranged to be urged by a system pressure spring disposed in said spring chamber in the direction of said valve seat which protrudes axially and displaceably into said system pressure chamber, said valve seat being supported in an axial bearing point, said valve seat further having an end remote from said valve diaphragm which comprises a valve plate which protrudes into a collection chamber and arranged to open a sealing seat to a greater or lesser extent toward a return flow line, a closing pressure spring positioned beneath said valve plate to urge said valve seat in the direction of said valve diaphragm and against a stop remote from said sealing seat, so that when said valve diaphragm is lifted up from said valve seat fluid can flow out via a conduit into said collection chamber and further wherein a throttle gap is provided between said system pressure chamber and said collection chamber.
Dependencies are inferred from the claim text.