Pressure control mechanism

Claim 1

APPARATUS FOR CONTROLLING PRESSURE, COMPRISING A HOUSING HAVING A PASSAGE THERETHROUGH, OPENING FULLY AT ONE END OF THE HOUSING AND CONSTRICTIVELY AT THE OTHER END THEREOF, SAID PASSAGE HAVING MEANS ADJACENT SAID FULL OPENING FOR RECEIVING AND MAINTAINING IN DISPLACEMENT ENGAGEMENT THEREWITH A PISTON MEANS, A FIRST CONDUIT PASSAGE IN SAID HOUSING COMMUNICATING THE SAID PASSAGE AT A POINT BETWEEN SAID OPENINGS THEREIN, WITH MEANS OUTSIDE SAID HOUSING, A SECOND CONDUIT PASSAGE IN SAID HOUSING COMMUNICATING THE SAID CONSTRUCTIVE OPENING IN THE PASSAGE WITH FURTHER MEANS OUTSIDE THE HOUSING, A PISTON MEANS FOR ENGAGEMENT IN THE SAID FULL OPENING COMPRISING A PLUNGER ELEMENT MADE OPERABLE WHEN DISPLACED ALONG SAID PASSAGE BETWEEN POINTS ADJACENT THE SAID FIRST CONDUIT PASSAGE AND SAID CONSTRICTIVE OPENING, BEARING MEANS FIXEDLY SECURED WITHIN SAID PISTON MEANS AND PASSING THROUGH SAID PLUNGER ELEMENT WHEREBY THE LATTER IS FREE TO BE DISPLACED RELATIVE TO SAID BEARING MEANS, AND A DEFORMABLE MEANS SUPPORTED AT ONE END OF SAID PLUNGER ELEMENT AND DISPLACEABLE THEREON RELATIVE TO SAID PISTON MEANS, FOR SEALING OFF ANY COMMUNICATION BETWEEN THE SAID MEANS AND FURTHER MEANS OUTSIDE SAID HOUSING THROUGH THE SAID FIRST AND SECOND CONDUIT PASSAGE BY WAY OF SAID PASSAGE.