Backflow-preventer
First Claim
1. A backflow-preventer for sanitary devices, especially for sanitary fittings, which comprises:
- a housing having a conduit, the housing including an outer sleeve, formed of an elastomeric material, which is disposed in the conduit and is fastened in a sealtight manner to the housing part and which includes a free-ending sleeve section, facing an outlet end of the conduit, wherein the sleeve section, upon water flowing through the outer sleeve from an inlet end of the conduit to the outlet end thereof, is elastically expandable,an inner sleeve which engages the outer sleeve and is fixed to the housing, the inner sleeve including a supporting section which is fold-resistant to water pressure, anda sealing lip section which adjoins said supporting section in the direction of the outlet end, the sleeve section of the outer sleeve engaging, under pretensioning, the supporting section and sealing lip section, of the inner sleeve, forming a sealing lip interacting with the sealing lip section and ending at least substantially in proximity with a free end of the inner sleeve, anda bearing element on which the inner sleeve is disposed and a plurality of ribs protruding from the housing, downstream from the outer sleeve, wherein the ribs project into the conduit and support said bearing element.
1 Assignment
0 Petitions
Accused Products
Abstract
To the housing part of a backflow-preventer for a sanitary device there is fastened an outer sleeve, made from elastomeric material, exhibiting a sleeve section which is distanced from the housing part. The outer sleeve embraces an inner sleeve which is fixedly supported to the housing and includes a supporting section, which is dimensioned such that the inner sleeve, when acted on by water flowing in the direction of flow, cannot fold inward. The sleeve section bears, under pretensioning, against the supporting section and is expanded by the pressure of the water so as to clear an opening between the sleeve section and the inner sleeve. If the water current is interrupted, the outer sleeve immediately bears again against the inner sleeve. The end sections of the inner and outer sleeves are configured like a sealing lip. The backflow-preventer prevents water from flowing back, even under the least underpressure on the feed side. Moreover, it is not sensitive to foreign bodies.
31 Citations
7 Claims
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1. A backflow-preventer for sanitary devices, especially for sanitary fittings, which comprises:
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a housing having a conduit, the housing including an outer sleeve, formed of an elastomeric material, which is disposed in the conduit and is fastened in a sealtight manner to the housing part and which includes a free-ending sleeve section, facing an outlet end of the conduit, wherein the sleeve section, upon water flowing through the outer sleeve from an inlet end of the conduit to the outlet end thereof, is elastically expandable, an inner sleeve which engages the outer sleeve and is fixed to the housing, the inner sleeve including a supporting section which is fold-resistant to water pressure, and a sealing lip section which adjoins said supporting section in the direction of the outlet end, the sleeve section of the outer sleeve engaging, under pretensioning, the supporting section and sealing lip section, of the inner sleeve, forming a sealing lip interacting with the sealing lip section and ending at least substantially in proximity with a free end of the inner sleeve, and a bearing element on which the inner sleeve is disposed and a plurality of ribs protruding from the housing, downstream from the outer sleeve, wherein the ribs project into the conduit and support said bearing element. - View Dependent Claims (2, 3, 4, 6, 7)
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5. A backflow-preventer for sanitary devices, especially for sanitary fittings, which comprises:
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a housing having a conduit, the housing including an outer sleeve, formed of an elastomeric material, which is disposed in the conduit and is fastened in a sealtight manner to the housing part and which includes a free-ending sleeve section, facing an outlet end of the conduit, wherein the sleeve section, upon water flowing through the outer sleeve from an inlet end of the conduit to the outlet end thereof, is elastically expandable, an inner sleeve which engages the outer sleeve and is fixed to the housing, the inner sleeve including a supporting section which is fold-resistant to water pressure, and a sealing lip section which adjoins said supporting section in the direction of the outlet end, the sleeve section of the outer sleeve engaging, under pretensioning, the supporting section and sealing lip section of the inner sleeve, forming a sealing lip interacting with the sealing lid section and ending at least substantially in proximity with a free end of the inner sleeve wherein the outer sleeve is shaped, in an end region on an inlet side, like a rim flange and covers a near-sided end of the housing and wherein a circumferential bead is formed on the rim flange of the outer sleeve, on the outer side of the housing.
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Specification