Patent ID: 8281810

Claim:
A dry valve for a sprinkler system, comprising: a housing having an inlet end and an outlet end and a passage therebetween; a prime chamber housing disposed within said housing and defining a prime chamber in communication with a prime chamber inlet and fluidly isolated from said passage, said prime chamber housing including a generally flat planar first valve seat on a downstream face of said prime chamber housing; a prime piston disposed within said prime chamber, said prime piston being movable between a closed position seated against a second valve seat in response to a supply of fluid to said prime chamber inlet and an open position received within said prime chamber in response to an interruption in said supply of fluid to said prime chamber inlet; a check valve assembly disposed within said passage in said housing and movable between a closed position and an open position, said check valve assembly being disposed against said generally flat planar first valve seat of said prime chamber housing in said closed position, wherein said inlet end of said housing and said prime chamber inlet are supplied with water at a common pressure and said outlet end and check valve assembly are supplied with air at a predetermined pressure.