Valve and pressure indicator for pressurized containers

Claim 1

IN COMBINATION WITH A CONTAINER HAVING AN OUTLET COMMUNICATING WITH A NOZZLE FROM WHICH MATERIAL UNDER PRESSURE IN THE CONTAINER MAY BE EXPELLED, THE IMPROVEMENT COMPRISING A VALVE FOR CONTROLLING THE PASSAGE OF MATERIAL FROM THE OUTLET TO THE NOZZLE AND FOR INDICATING THE VALUE OF PRESSURE IN THE CONTAINER, COMPRISING MEANS FORMING A PASSAGEWAY BETWEEN THE OUTLET AND THE NOZZLE TO HAVE AN ELONGATE SEALING SURFACE AND AN OPEN END COMMUNICATING WITH THE OUTLET, A VALVE STEM MOUNTED FOR AXIAL MOVEMENT IN THE PASSAGEWAY AND HAVING A PORTION FORMED TO MATE WITH THE SEALING SURFACE TO FORM A SEAL, SPRING MEANS FOR URGING THE VALVE STEM TOWARD SAID OPEN END ONLY A DISTANCE THAT IS LESS THAN THE LENGTH OF THE ELONGATE SEALING SURFACE WHEREBY SAID SPRING MEANS CAN URGE THE VALVE STEM ONLY WHEN THERE IS ENGAGEMENT BETWEEN THE SEALING SURFACE AND THE MATING PORTION OF THE VALVE STEM, AND MEANS FOR OPERATING THE VALVE STEM TO MOVE IT OUT OF ENGAGEMENT WITH THE SEALING SURFACE TO AN OPEN, MATERIAL EXPELLING POSITION.