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1. 发明授权

US5228470A Self draining hose connection dual check valve back flow preventer 失效
标题翻译：自排水软管连接双止回阀回流防止器
公开(公告)号：US5228470A
公开(公告)日：1993-07-20
申请号：US823875
申请日：1992-01-22
申请人： John E. Lair , James F. Delahunty , Lawrence F. Luckenbill , Richard J. Holliday
发明人： John E. Lair , James F. Delahunty , Lawrence F. Luckenbill , Richard J. Holliday
IPC分类号： E03C1/10
CPC分类号： E03C1/106 , E03C1/108 , Y10T137/3331 , Y10T137/9029
摘要： In order to prevent contamination of a fluid source and to ensure drainage of a sill cock or the like, a detachable check valve back flow preventer for installation between a fluid inlet line and a fluid outlet line is provided. A housing with means for fastening the device to a fluid inlet line at one end of the housing and for connecting a fluid outlet line at the other end of the housing is provided. The housing has a central cavity within the housing. An inlet line drain valve is located within the housing between the central cavity and the fluid inlet line to provide for the drainage of fluid from the fluid inlet line to the fluid outlet line end of the housing when the fluid outlet line is not connected to the back flow preventer. A second valve is located within the housing between the central cavity and the fluid inlet line to control flow of fluids between the fluid inlet line and the central cavity. A third valve is located within the housing between the central cavity and the fluid outlet line to control flow between the central cavity and the fluid outlet line. In a second aspect of this invention a fourth valve is located within the housing between the central cavity and the drainage flow path to control flow between the central cavity and the venting means. This second aspect can be utilized in conjunction with the above three valves or in combination with only the second and the third valve.
摘要翻译：为了防止流体源的污染并且确保门槛阀等的排放，提供了用于安装在流体入口管线和流体出口管线之间的可拆卸止回阀回流防止器。一种壳体，其具有用于将所述装置紧固到所述壳体的一端处的流体入口管线并且用于连接所述壳体的另一端处的流体出口管线的装置。壳体在壳体内具有中心空腔。入口管排放阀位于壳体内部的中心腔和流体入口管之间，以便当流体出口管线未连接到流体出口管线时将流体从流体入口管路排出到流体出口管路端部回流防止器。第二阀位于壳体内的中心腔和流体入口管线之间，以控制流体在流体入口管线和中心空腔之间的流动。第三阀位于壳体内的中心腔和流体出口管之间，以控制中心腔和流体出口管之间的流动。在本发明的第二方面，第四阀位于壳体内的中心腔和排水流动路径之间，以控制中心腔和通气装置之间的流动。该第二方面可以与上述三个阀结合使用，也可以仅与第二阀和第三阀结合使用。

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