Vacuum regulating valve

Claim 1

A REGULATING VALVE FOR DELIVERING A DESIRED MAXIMUM LEVEL OF VACUUM WHEN SUPPLIED A PULSATING VACUUM OF CORRESPONDINGLY VARYING FREQUENCY AND MEANS PRESSURE LEVEL, SAID VALVE COMPRISING A VACUUM CHAMBER HAVING A SUPPLY PORT, A DELIVERY PORT AND AN ATMOSPHERIC PORT OPENING TO ATMOSPHERE, A VALVE SEAT SURROUNDING SAID ATMOSPHERIC PORT, A VALVE CLOSURE MOUNTED ON A DIAPHRAGM FOR OSCILLATORY MOVEMENT OF VARYING AMPLITUDE AND FREQUENCY TOWARD AND AWAY FROM SAID VALVE SEAT FOR THROTTLING AIR FLOW THROUGH SAID ATMOSPHERIC PORT, PNEUMATIC SPRING MEANS HAVING READY RESPONSE TO THE MEANS PRESSURE LEVEL IN SAID VACUUM CHAMBER FOR TENDING TO DRAW SAID DIAPHRAGM AND SAID VALVE CLOSURE AWAY FROM SAID VALVE SEAT IN ACCORDANCE WITH THE MEAN PRESSURE DIFFERENTIAL ACROSS SAID ATMOSPHERIC PORT AND HAVING LIMITED RESPONSE TO TRANSIENT PULSATION IN THE PRESSURE LEVEL IN SAID VACUUM CHAMBER AND MECHANICAL SPRING MEANS TENDING TO URGE SAID VALVE CLOSURE TOWARD SAID VALVE SEAT WITH A SUBSTANTIALLY CONSTANT AND PREDETERMINED FORCE WHEREBY GREATER OR LESSER AMOUNTS OF AIR AT ATMOSPHERIC PRESSURE ARE ADMITTED TO SAID VACUUM CHAMBER AS THE MEAN OF THE PULSATING VACUUM LEVEL IN SAID CHAMBER DEPARTS MORE OR LESS FROM AND ABOVE THE DESIRED LEVEL.