Combined air muffler and metering valve with replaceable cartridge

Claim 1

AN AIR MUFFLER CONSTRUCTION COMPRISING: (A) A THREADED NIPPLE ADAPTED TO BE CONNECTED TO A VALVE OUTLET INCLUDING A BODY HAVING A CENTRAL PASSAGE, (B) A THREADED PORTION ON THE BODY OF SAID NIPPLE, (C) A CYLINDRIAL SHELL HAVING AN INTERIOR THREADED PORTION AT ONE OPEN END THEREOF TO COOPERATE WITH SAID THREADED PORTION ON THE BODY OF SAID NIPPLE TO JOIN THE NIPPLE AND THE SHELL TOGETHER, (D) AN AIR RESTRICTING CARTRIDGE CONFINED WITHIN SAID SHELL BETWEEN ONE END THEREOF AND SAID BODY PORTION OF SAID NIPPLE HAVING ITS OUTER SURFACE LYING AGAINS THE INNER SURFACE OF THE SHELL, (E) RESTRICTED AIR PASSAGES FORMED IN SAID SHELL OVERLYING SPACED PORTIONS OF THE OUTER SURFASCE OF SAID CARTRIDGE, THE OTHER END OF SAID SHELL OPPOSITE THE OPEN END HAVING A THREADED RECESS CONCENTRIC WITH SAID SHELL, (F) A TUBE EXTENDING AXIALLY INTO SAID SHELL FROM SAID CENTRAL PASSAGE, AND (G) A SCREW IN SAID THREADED RECESS HAVING ONE END ADJACENT ONE END OF SAID TUBE EXTENDING FROM THE CENTRAL PASSAGE OF SAID NIPPLE, SAID SCREW BEING ADJUSTABLE TO PERMIT PREDETERMINED RESTRICTION OF SAID PASSAGE.