| 摘要 |
A pressure relief valve for cryogenic service includes: a fluid inlet and a fluid outlet; a nozzle (300) disposed within the fluid inlet, said nozzle having a nozzle groove (310) radially formed on an exterior cylindrical surface of the nozzle and an outwardly disposed ledge (305) having a lower ledge surface comprising a portion of an exterior surface of the nozzle groove and an upper ledge surface comprising a seat (119); a substantially cylindrical closure disc (200) with a lower portion including a groove (220) formed on an exterior radial surface of the cylindrical body, an outwardly disposed lip (215) having an upper surface comprising a portion of an interior surface of the groove, said lip of the closure disc having a lower closure surface. The lip of the closure disc being adapted to deflect downward and inward in response to a cryogenic thermal gradient applied across the lip. |
