Safety flow valve

Claim 1

IN A VALVE STRUCTURE COMPRISING, IN COMBINATION: A GENERALLY TUBULAR VALVE BODY HAVING MEANS AT ONE END THEREOF FOR SECURING SAID BODY TO A CONTAINER; A FIRST CHAMBER FORMED IN SAID BODY ADJACENT SAID ONE END; A SECOND CHAMBER FORMED WITHIN SAID BODY ADJACENT SAID FIRST CHAMBER AND HAVING AN OPENING IN THE WALL THEREOF; A VALVE SEAT INTERMEDIATE SAID FIRST AND SECOND CHAMBER; A VALVE HEAD DISPOSED IN SAID SECOND CHAMBER AND ADAPTED TO ENGAGE SAID VALVE SEAT; A HOLLOW VALVE STEM SLIDABLY MOUNTED IN SAID SECOND CHAMBER AND ATTACED TO SAID VALVE HEAD; A FIRST SPRING MOUNTED AROUND SAID STEM AND ACTING BETWEEN SAID TEM AND SAID VALVE BODY TO NORMALLY BIAS SAID VALVE HEAD OUT OF ENGAGEMENT WITH SAID VALVE SEAT; A VALVE SHAFT EXTENDING FROM WITHIN SAID FIRST CHAMBER TO WITHIN SAID SECOND CHAMBER, SAID SHAFT EXTENDING SLIDABLY THROUGH SAID VALVE HEAD AND SAID VALVE STEM WITH A CLEARANCE PROVIDING A BLEED PASSAGE CONNECTING SAID FIRST AND SECOND CHAMBERS; A LOST MOTION CONNECTION BETWEEN SAID VALVE STEM AND SAID VALVE SHAFT; MEANS CONNECTED TO SAID VALVE SHAFT FOR CLOSING SAID BLEED PASSAGE WHEN SAID SHAFT IS IN VALVE CLOSING POSITION; A SECOND SPRING MOUNTED AROUND SAID SHAFT AND ACTING BETWEEN SAID SHAFT AND SAID VALVE BODY TO NORMALLY BIAS SAID VALVE HEAD INTO ENGAGEMENT WITH SAID VALVE SEAT; VALVE OPERATING MEANS EXTENDING INTO SAID FIRST CHAMBER AND INTO ENGAGEMENT WITH SAID SHAFT FOR MOVING SAID SHAFT IN A DIRECTION AGAINST THE TENSION OF SAID SECOND SPRING TO A VALVE OPENING POSITION; THE IMPROVEMENT COMPRISING: HOLDING MEANS EXTENDING INTO SAID FIRST CHAMBER ADJACENT SAID VALVE OPEATING MEANS AND OPERABLE TO ENGAGE SAID VALVE OPERATING MEANS SO AS TO HOLD SAME IN ENGAGEMENT WITH SAID SHAFT.