Patent ID: 6357467
Filing Date: 2002-03-19
Classification: A62C,F16K,Y10T

Abstract:
An automatic water supply shutoff valve for use in connection with fire protection water supply piping system, said automatic water supply shutoff valve comprising:a valve body defining a cavity in communication among a supply inlet for connection to a supply of water, a first, ancillary outlet for connection to ancillary supply piping, and a second, fire protection outlet for connection to fire protection piping; and a piston disposed within said cavity and defining a piston passageway, said piston being mounted for movement between a first position with said piston passageway connecting said supply inlet with said first, ancillary outlet, for flow of water therebetween, and a second position with said piston passageway connecting said supply inlet with said second, fire protection outlet, for flow of water therebetween, movement of said piston between said first position and said second position being responsive to biasing forces acting against said piston, said biasing forces comprising a first biasing force from said supply inlet acting over a first surface area of said piston, a second biasing force from said fire protection outlet acting over a second surface area of said piston, and a third biasing force acting against said piston, said first biasing force, urging said piston toward its second position, being opposed by a combination of said second biasing force and said third biasing force, together urging said piston toward its first position, said piston defining a piston inlet in communication between said supply inlet and said piston passageway and a plurality of radial piston outlets, in said first position, in communication between said piston passageway and said first, ancillary outlet and, in said second position, in communication between said piston passageway and said second, fire protection outlet.