Fill and relief valve arrangement

Claim 1

A fill and relief valve arrangement for the introduction of fluid into and the selective venting of fluid from a variable fluid chamber, comprising; a body disposed at one end of the variable volume fluid chamber and having an open-ended bore formed therein with one end of the bore opening into the fluid chamber, a valve seat formed at said one end of the bore, and a vent port communicating the bore with the atmosphere, said bore including a smooth bore portion at the other end thereof and a threaded portion intermediate the ends; and a fill valve having a fluid flow path extending axially therethrough, an externally threaded portion screw threaded into the threaded portion of the bore, a flared end portion partially disposed within the fluid chamber in sealing engagement with the valve seat isolating the fluid chamber from the vent port, a stem protruding through the fluid bore portion, and a check valve disposed in the fluid flow path for permitting one-way communication therethrough for directing pressurized fluid to the fluid chamber when the flared end portion is in sealing engagement with the valve seat, said fill valve being rotatable to move the flared end portion inwardly into the fluid chamber away from said valve seat for venting the fluid chamber to the atmosphere.