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US 5,090,393 AGranted
Pressure regulating valve for installation in a vent duct of an internal combustion engine
AssigneeFilterwerk Mann & Hummel GmbH
InventorHans-Werner Holch
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AssigneeFilterwerk Mann & Hummel GmbH
InventorHans-Werner Holch
Estimating the term…
A pressure regulating valve, especially for regulating the vacuum in the crankcase of an internal combustion engine, which includes a pan-shaped housing having a bottom part, a housing cover, and a diaphragm 14 arranged between the housing and housing cover. A hollow cylindrical part 26 is arranged adjacent the diaphragm and encloses an intermediate valve member which is held in its rest position by a compression spring 24. The diaphragm is moved by a further compression spring 25 into an upper, rest position. If a vacuum in the intake manifold exceeds a certain limit value, the first valve opening between the valve seat 17 and the valve plate 18 closes against the force of the spring 24, so that blow-by gases aspirated from the crankcase are carried through the valve opening 20. If the intake manifold vacuum increases further, the diaphragm 14 moves toward the valve opening 20 and, at a maximum permissible vacuum, closes this valve opening as well. This two-stage valve is constructed in an especially compact and space-saving manner, and can be set to specific pressure limits by appropriately sizing the compression springs or the cross-sectional ratios of the valve parts.
A pressure regulating valve comprising a valve housing comprising a housing bottom and a housing cover, an inlet nipple leading into said housing bottom, an outlet nipple leading from said housing bottom having an inner end configured as a first valve seat disposed within said valve housing, a diaphragm for dividing the valve housing into a valve chamber and a vent chamber, said diaphragm including a diaphragm valve plate facing said first valve seat, a vent opening connecting said vent chamber to the ambient atmosphere, a first compression spring in said valve chamber for urging said diaphragm away from said first valve seat, and an intermediate valve member disposed between said diaphragm valve plate and said first valve seat such that said intermediate valve member can move axially relative to said first valve seat and said diaphragm can move axially relative to said intermediate valve member, said intermediate valve member comprising a second valve plate facing and cooperating with said first valve seat to form a primary valve and a second valve seat facing said diaphragm and cooperating with said diaphragm valve plate to form a secondary valve.
Dependencies are inferred from the claim text.