Liquid flow regulating arrangements

Claim 1

IN AN HYDRAULIC SYSTEM INCLUDING A LIQUID TANK, MEANS SUPPLYING LIQUID INTO THE TANK, AND A DISCHARGE PIPE FOR LIQUID FROM THE TANK, A REGULATOR SYSTEM COMPRISING A PRESSURE-RESPONSIVE OBTURATOR MEANS VARIABLY POSITIONABLE IN RELATION TO THE DISCHARGE PIPE TO CONTROL THE RATE OF FLOW THEREFROM, AN AUXILIARY PRESSURE-FLUID CIRCUIT MEANS CONNECTED WITH THE OBTURATOR MEANS AND INCLUDING A VALVE OPERABLE TO MODIFY THE FLUID PRESSURE ACTING ON THE OBTURATOR MEANS TO VARY THE POSITION THEREOF IN RELATION TO SAID DISCHARGE PIPE, MEANS SENSING AN OPERATING PARAMETER OF SAID SYSTEM, A CONTROL CONNECTION FROM SAID SENSING MEANS TO SAID VALVE, A FOLLOW-UP CONNECTION FROM SAID OBTURATOR MEANS TO SAID VALVE TO REPOSITION THE VALUE ON VARIATION IN THE POSITION OF THE OBTURATOR MEANS, MEANS FOR DISABLING SAID CONTROL CONNECTION TO SUSPEND THE ACTION OF SAID OPERATING PARAMETER ON THE VALVE AND MAINTAIN THE OBTURATOR MEANS AT A PRESCRIBED SETTING RELATIVE TO SAID DISCHARGE PIPE, INCLUDING MEANS FOR PROGRESSIVELY RE-ESTABLISHING SAID CONTROL CONNECTION TO REINTRODUCE SAID CONTROLLING ACTION IN A GRADUAL MANNER, SAID DISABLING AND PROGRESSIVE RE-ESTABLISHING MEANS COMPRISING A CONTROL FLOAT MEMBER CONNECTED TO SAID VALVE SO AS TO TEND TO OPERATE SAID VALVE IN ONE DIRECTION UNDER THE FORCE OF GRAVITY, A CONTROL TANK CONTAINING SAID FLOAT MEMBER, MEANS FOR FILLING LIQUID INTO THE CONTROL TANK TO CANCEL THE GRAVITY OF THE FLOAT MEMBER AND OPERATE THE VALVE IN THE OPPOSITE DIRECTION, MEANS FOR GRADUALLY DRAINING THE LIQUID OUT OF THE CONTROL TANK TO RE-ESTABLISH THE NORMAL GRAVITY OF THE FLOAT MEMBER IN A PROGRESSIVE MANNER, AND SAID PRESSURE FLUID BEING A LIQUID AND CONSTITUTING THE LIQUID FILLED INTO THE CONTROL TANK.