Patent ID: 7267136
Filing Date: 2007-09-11
Classification: E03B,F16K,Y10T

Abstract:
1. A fluid flow prevention apparatus for a wet barrel fire hydrant, the hydrant being in communication with a pipe having a periphery defining a flow passageway therethrough, said fluid flow prevention apparatus comprising: a non-hinged valve member for closing the flow passageway of the pipe, said valve member aligned axially with the flow passageway of the pipe and operably movable from an open to closed position upon damage to the hydrant; and an adjustable damping member for controlling the rate of closing of said valve member, said adjustable damping member in communication with said valve member, wherein sudden closure of said valve member is prevented to reduce the effects of water hammer within the pipe; wherein said adjustable damping member comprises an adjustable tubular body filled with viscous fluid; wherein said valve member is a pressure sensitive cut off valve that is operably closed by water pressure; and wherein said adjustable damping member is connected to said valve member by a tube member.