초록 ▼

A backwater escape valve comprises a threaded shank received in the threaded opening of a clean out. A pivotally mounted valve body provides a frustoconical valve element and is biased by a spring or by gravity into a closed position against a mirror image frustoconical valve seat. Means are provide

A backwater escape valve comprises a threaded shank received in the threaded opening of a clean out. A pivotally mounted valve body provides a frustoconical valve element and is biased by a spring or by gravity into a closed position against a mirror image frustoconical valve seat. Means are provided to limit opening movement of the valve body in a range of 20°-60°away from the valve seat. The valve seat member is configured to be fully opening and of maximum internal diameter.

대표청구항 ▼

A backwater escape valve comprising a body member having a threaded shank of the same pitch and diameter as external threads of a clean out plug and providing an internal passage of predetermined size and shape having a longitudinal axis; a valve seat member integral with the threaded shank providin

A backwater escape valve comprising a body member having a threaded shank of the same pitch and diameter as external threads of a clean out plug and providing an internal passage of predetermined size and shape having a longitudinal axis; a valve seat member integral with the threaded shank providing a central passage symmetrical about the longitudinal axis and being the same size and shape as the shank internal passage, a valve seat being a frustoconical surface inclined to the longitudinal axis at an angle between 30°-60°having a small end adjacent the threaded shank and a large end, the small end merging with the central passage, an unthreaded exterior at least as large as the threaded shank having an axial extent sufficient to receive a mechanical force applier, a first annular lip perpendicular to the longitudinal axis merging, at an inner diameter thereof, with the large end of the valve seat and, at an outer diameter thereof, with the exterior of the body member, first pivotal mounting means extending from the exterior; and a valve member comprising a plate like body having an external side and an internal side, the internal side providing a second annular lip comprising a mirror image of the first annular lip for abutting the first lip in a closed position of the valve member, a frustoconical valve element comprising a mirror image of the frustoconical valve seat surface having means for sealing against the frustoconical valve seat surface, and second pivotal mounting means extending from the plate like body and means interconnecting the first and second pivotal mounting means for enabling movement of the valve member from a first closed position where the first and second lips abut and the frustoconical valve element sealing means abuts the frustoconical valve seat surface and a second open position; and means cooperating between the body member and the valve member for limiting movement of the valve member away from the body member in a range of 20°-60°.