Automatic well head flow control

Claim 1

A FLOW CONTROL DEVICE FOR USE WITH A FLUCTUATING PRESSURE SOURCE OF FLUID COMPRISING, A BODY HAVING AN INLET PASSAGE CONNECTED TO SAID SOURCE AND AN OUTLET PASSAGE HAVING AN INNER SEATING END, A CHOKE ELEMENT POSITIONED IN THE BODY FOR MOVEMENT INTO AND OUT OF ENGAGEMENT WITH SAID INNER SEATING END OF THE OUTLET PASSAGE FOR REGULATING FLUID FLOW FROM THE INLET PASSAGE THROUGH SAID OUTLET PASSAGE, PRESSURE RESPONSIVE MEANS ACTUATABLE FOR MOVEMENT OF SAID CHOKE ELEMENT, ADJUSTABLE VALVE MEANS ESTABLISHING RESTRICTED FLUID COMMUNICATION BETWEEN THE INLET PASSAGE AND THE PRESSURE RESPONSIVE MEANS FOR ACTUATION THEREOF IN DELAYED RESPONSE TO DEVELOPMENT OF A PRESSURE CONDITION IN SAID SOURCE, AND PRESSURE SIGNAL DELAY MEANS RESPONSIVE TO POSITIONING OF THE CHOKE ELEMENT FOR FURTHER DELAYING MOVEMENT OF THE CHOKE ELEMENT ONLY IN RESPONSE TO AN INCREASE IN PRESSURE OF SAID SOURCE WHEN THE CHOKE ELEMENT IS OUT OF ENGAGEMENT WITH THE INNER SEATING END OF THE OUTLET PASSAGE, WHEREBY THE FLOW OF FLUID FROM THE SOURCE IS VARIED TO STABILIZE THE PRESSURE CONDITION THEREOF, SAID PRESSURE SIGNAL DELAY MEANS COMPRISING A YOKE MEMBER INTERCONNECTING SAID CHOKE ELEMENT WITH THE PRESSURE RESPONSIVE MEANS, A CONNECTING PASSAGE FORMED IN THE BODY ESTABLISHING FLUID COMMUNICATION BETWEEN THE INLET PASSAGE AND THE ADJUSTABLE VALVE MEANS, SAID YOKE MEMBER MOVING INTO SAID CONNECTING PASSAGE TO REDUCE THE FLOW AREA THEREOF WHEN THE CHOKE ELEMENT IS OUT OF ENGAGEMENT WITH THE INNER SEATING END OF THE OUTLET PASSAGE.