초록 ▼

A safety valve for relieving excessive pressure in a fluid system including a valve body having a central chamber, a discharge flow nozzle connected into the chamber having a valve seat on the end of the flow nozzle in the chamber, a valve disc movably mounted in the chamber for movement between a c

A safety valve for relieving excessive pressure in a fluid system including a valve body having a central chamber, a discharge flow nozzle connected into the chamber having a valve seat on the end of the flow nozzle in the chamber, a valve disc movably mounted in the chamber for movement between a closed position on the nozzle seat and an open position spaced from the nozzle seat, a valve disc holder connected with the valve disc having a deflecting rim circumscribing the valve disc seat provided with an internal outwardly divergent annular deflecting surface, a blowdown ring mounted on the nozzle having an inner ring portion provided with an outer frustoconical deflecting surface substantially parallel with and spaced from the valve disc holder deflecting surface, the blowdown ring including an outer cylindrical rim provided with circumferentially spaced semi-elliptical discharge ports and an internal cylindrical surface substantially parallel with and spaced from the outer cylindrical surface of the valve disc holder, and a spring connected with the valve disc holder for biasing the valve disc holder and valve disc closed. The blowdown ring is adjustable for changing the blowdown of the valve. The configuration of the valve disc holder and the blowdown ring deflecting surfaces provides chatter free operation.

대표청구항 ▼

A safety valve to relieve fluid pressure in a pressure vessel when the pressure reaches a predetermined maximum value, including: a flow fitting defining a discharge nozzle for connection into a pressure vessel including a valve seat around a discharge flow passage through the nozzle: a valve disc h

A safety valve to relieve fluid pressure in a pressure vessel when the pressure reaches a predetermined maximum value, including: a flow fitting defining a discharge nozzle for connection into a pressure vessel including a valve seat around a discharge flow passage through the nozzle: a valve disc having a valve seat thereon movable between a first closed position of engagement with the nozzle valve seat and a second open position spaced from the nozzle valve seat; an annular disc holder mounted around and supporting the valve disc for movement between the first and second positions, including a circumferential defecting rim spaced radially outward from the valve disc seat and extending endwardly beyond the valve disc seat, the outer face of said deflecting rim being a cylindrical surface and the inner face of said deflecting rim is a tapered surface sloping outwardly from the valve seat of the valve disc; and an adjustable blowdown ring on the discharge nozzle including an annular inner nose portion around the nozzle seat projecting into and spaced inwardly from the disc holder rim at the first closed and bleed positions of the valve disc and a concentric annular outer rim spaced from the inner nose portion and the disc holder deflecting rim defining an annular flow passage between the blowdown ring and the deflecting rim in the closed and bleed positions of the disc holder and disc, the outer face of inner nose portion of the blowdown ring being tapered away from the discharge nozzle seat toward the inner face of the outer rim of the blowdown ring, the disc holder deflecting rim having an annular conical inner surface sloping outwardly toward the discharge nozzle, the blowdown ring having an annular tapered outer surface sloping outwardly away from the valve disc substantially parallel with the sloping inner surface of the deflecting rim of the disc holder, the concentric outer rim of the blowdown ring having a plurality of circumferentially spaced semi-elliptical discharge ports.