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US 2009/0020724 A1Published application
Combined check and control valve
AssigneePierburg GmbH
InventorHolger PAFFRATH
Life of this patent
Estimating the term…
Abstract
To overcome problems concerning the sticking of the check plate in a combined check and control valve, a stop is provided on the valve rod or a guide element in the vicinity of the valve rod, whose distance to the limiting element is smaller than the maximum stroke and larger than the nominal stroke of the limiting element. Thus, it is achieved that the check plate is released from the valve seat by means of the stop, when the valve rod is displaced to the maximum.
Claims13
A combined check and control valve, comprising:
- a housing having an inlet and an outlet;
- one or more passages arranged between the inlet and the outlet, each passage being surrounded by a respective first valve seat;
- a check plate operable to close each passage;
- at least one spring element operable to bias the check plate against the one or more valve seats;
- an actuator;
- a limiting element which is at least indirectly fixedly secured to a valve rod operable by the actuator;
- wherein the valve rod is at least indirectly connected with a stop situated at a constant distance from the limiting element;
- wherein the limiting element supports the spring element, thereby allowing the spring element to bias the check plate;
- and
- wherein the stop is positioned on the valve rod such that the stop presses against the check plate when the limiting element is opened beyond a nominal stroke.
7 more elements
Dependencies are inferred from the claim text.