Two-stage pressure relief valve

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

E - Fixed Constructions

21

B

255/73

E21B 10/22 (2006.01) E21B 10/24 (2006.01)

Patent

CA 1175039

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

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