Two-stage pressure relief valve

Details Two-stage pressure relief valve Two-stage pressure relief valve

1981-02-09

1983-06-21

Brown, David H.

Lubrication

Lubricators

Force feed

137540, 175228, 175371, 384 94, E21B 908, E16C 3374

Patent

active

043889840

ABSTRACT:
A two-stage vent cap type pressure relief valve for a rock bit is disclosed that relieves low pressure gases in a first stage and higher pressure gases in a second stage.

REFERENCES:
patent: 3721306 (1973-03-01), Sartor
patent: 3847234 (1974-11-01), Schumacher et al.
patent: 3854496 (1974-12-01), Broszeit
patent: 3866695 (1975-02-01), Jackson
patent: 4161223 (1979-07-01), Oelke
patent: 4248484 (1981-02-01), Newcomb

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