Patent ID: 9016303
Filing Date: 2015-04-28
Classification: B01D,F16K,Y10T

Abstract:
1. An automatic air evacuation apparatus attached to a swimming pool or spa filter having an interior comprising: a valve body having a cavity, a top end, and a bottom hole that is in communication with said interior of said swimming pool or spa filter; an internal assembly comprising a ball retainer attached to an upper ball shield; a lower ball that is within said ball retainer; an upper ball that is within said upper ball shield; a top cover attached to said top end of said valve body and having an exhaust hole; wherein said upper ball shield comprising an annular sidewall with a plurality of flaps protruding outwardly therefrom that align said internal assembly within said cavity such that said lower ball sits directly on top of said bottom hole; wherein said internal assembly sits within said cavity with said lower ball sitting on said bottom hole: whereby said lower ball is pushed upward by air flowing from said interior of said swimming pool or spa filter into said cavity through said bottom hole; whereby said upper ball is pushed upward by water flowing from said interior of said swimming pool or spa filter into said cavity through said bottom hole until said upper ball seals said exhaust hole; and whereby said water flowing from said cavity back into said swimming pool or spa filter forces said lower ball to seal said bottom hole and said upper ball to unseal said exhaust hole.