MULTI-MEDIA SAFETY RELIEF VALVE

摘要

An excess pressure safety relief valve includes a valve disc (30) movably mounted for movement between a closed and an open position, a valve disc holder (31) connected with the valve disc (30) having a deflecting rim (30B) circumscribing the valve disc providing with an internal outwardly divergent annular deflecting surface, a blowdown ring (21c) mounted on the nozzle (14) having an inner ring portion (21B) provided with an outer frustoconical deflecting surface (21D) substantially parallel with and spaced from the valve disc holder deflecting surface (31B). The blowdown ring includes an outer cylindrical rim (21A) provided with circumferentially spaced semi-elliptical discharge ports (21E) and an internal cylindrical surface (21F) substantially parallel with and spaced from the outer cylindrical surface (31C) of the valve disc holder (31), and a spring (44) connected with the valve disc holder (31A) for biasing the valve closed. The blowdown ring is adjustable for changing the blowdown of the valve.