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US 2004/0069352 A1Published application
Check valve
OwnerThomas Wieland, Ulrich Muellerinventors
Life of this patent
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Abstract
In the check valve according to the invention, a narrowing of the inner chamber encompassing the closing body results in the fact that the closing body already reaches—and is damped in—its end position at a comparatively low delivery quantity, which significantly reduces vibrations and thus the generation of noise. The cross section of the inner chamber narrows, for example monotonically, in the opening direction of the closing body.
Claims11
In a check valve comprising of a housing having an inlet opening, an outlet opening, and an inner chamber that has a valve seat at its inlet end,
- a movable closing body contained in the inner chamber,
- a stop limiting the movement of the closing body, and
- a valve spring that acts on the closing body in the closing direction of the check valve, the improvement wherein the cross section of the inner chamber (4) encompassing the closing body (7, 17) narrows in the opening direction (15) of the check valve.
Dependencies are inferred from the claim text.