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An automatic shut-off valve for installation on a swimming pool or spa main drain. The automatic shut-off valve has a ball and ball spring between a diaphragm and a housing. The diaphragm is made of resilient material. Downward force on the diaphragm urges the ball into sealable engagement with a va

An automatic shut-off valve for installation on a swimming pool or spa main drain. The automatic shut-off valve has a ball and ball spring between a diaphragm and a housing. The diaphragm is made of resilient material. Downward force on the diaphragm urges the ball into sealable engagement with a valve seat in the housing. During operation, a swimmer covers sufficient diaphragm base apertures so that the diaphragm center is moved downwards as urged by the main drain suction, towards a swimming pool or spa main drain over which the automatic shut-off valve is mounted. The downward motion of the diaphragm urges the ball into sealable engagement with a valve seat in the housing, where it is securely held by the main drain suction. In this fashion, the ball is entrapped instead of the swimmer, thus avoiding possible disembowelment and/or drowning on the part of the swimmer. Back-up shut-off function is provided by a cap spring-loaded into a closed position whence it migrates should the ball become dislodged. An alternate embodiment automatic shut-off valve is disclosed wherein an integral are diaphragm and base replaces the diaphragm/diaphragm base combination of the preferred embodiment.

대표청구항 ▼

1. An automatic shut-off valve comprising a ball and a ball spring disposed between a diaphragm and a housing, said diaphragm being made of resilient material, a diaphragm base attached to said diaphragm around an outer edge of said diaphragm, said diaphragm base comprising a plurality of diaphragm

1. An automatic shut-off valve comprising a ball and a ball spring disposed between a diaphragm and a housing, said diaphragm being made of resilient material, a diaphragm base attached to said diaphragm around an outer edge of said diaphragm, said diaphragm base comprising a plurality of diaphragm base apertures, said diaphragm base being attached to said housing, said housing comprising a housing ball chamber communicating with a housing spring chamber through a valve seat, said ball being sized to sealably seat in said valve seat when said automatic shut-off valve is in a closed position, said ball being disposed substantially within said ball chamber, said ball spring being disposed substantially within said spring chamber, said ball spring urging said ball out of contact with said valve seat, said housing further comprising at least one housing spring chamber aperture through which said spring chamber communicates with an exterior of said housing spring chamber.