Air flow control for pressure feed containers

Claim 1

A CONTAINER ASSEMBLY FOR SUPPLYING MATERIAL UNDER AIR PRESSURE TO A SPRAY DEVICE, OF THE TYPE HAVING A CONTAINER, A HEAD MEMBER TO WHICH THE CONAINER IS DETACHABLY CONNECTED, AN OUTLET THROUGH THE HEAD MEMBER FOR THE DELIVERY TO A SPARY DEVICE OF MATERIAL FROM THE CONTAINER, AND AIR PASSAGE MEANS THROUGH THE HEAD MEMBER TERMINATING IMMEDIATELY ABOVE THE CONTAINER FOR THE ENTRY AND VENTING OF AIR TO AND FROM THE TOP PORTION OF THE CONTAINER ABOVE THE LEVEL OF THE MATERIAL; SAID CONTAINER ASSEMBLY BEING CHARACTERIZED BY THE COMBINATION WITH SAID AIR PASSAGE MEANS OF A SELF-ACTING INLET VALVE OPENING UNDER THE PRESSURE OF AIR TO ADMIT AIR TO THE CONTAINER A MANUALLY OPERATED RELIEF VALVE COMMUNICATING WITH THE AIR PASSAGE MEANS AND WHEN IN OPEN POSITION VENTING THE AIR PASSAGE MEANS TO THE ATMOSPHERE, AND A SUPPLEMENTAL SELF-ACTING RELIEF VALVE IN THE AIR PASSAGE MEANS BETWEEN THE MANUALLY OPERATED RELIEF VALVE AND THE CONTAINER AND OF A COMPOSITION AND STRUCTURE PROVIDING A DEGREE OF RESISTANCE TO OPENING, WHEN THE MANUALLY OPERATED RELIEF VALVE IS IN OPEN POSITION, WHICH PERMITS OPENING OF THE SUPPLEMENTAL RELIEF VALVE BY AIR UNDER PRESSURE WITHIN THE CONTAINER FOR VENTING SUBSTANTIALLY ALL OF SUCH AIR THEREFROM BUT WHICH RESISTS OPENING OF SAID SUPPLEMENTAL RELIEF VALVE BY THE MOMENTUM OF MATERIAL SPLASHING THEREAGAINST OR BY HEAD PRESSURE ARISING FROM JARRING OR TILTING OF THE CONTAINER ASSEMBLY, SAID SELF ACTING RELIEF VALVE AND SELF-ACTING INLET VALVE BEING LOCATED AT THE END OF THE AIR PASSAGE TERMINATING IMMEDIATELY ABOVE THE CONTAINER AND WHEN IN CLOSED POSITION SEALING THE AIR PASSAGE MEANS FROM THE CONTAINER.