Multi-input control mechanism for hydraulic servo valve

Claim 1

A HYDRAULIC SERVO VALVE COMPRISING: A BODY DEFINING A CYLINDER, A PAIR OF NOZZLES, AND PASSAGEWAYS COMMUNICATING WITH SAID CYLINDER AND NOZZLES; A POWER CONTROL VALVE MOVABLE WITHIN SAID CYLINDER AND RECEIVED THEREBY FOR APPLYING POWER THROUGH SAID PASSAGEWAYS TO A LOAD; A FLAPPER ASSEMBLY HAVING A PIVOT POINT AND BEING DISPOSED PARTIALLY WITHIN SAID BODY BETWEEN SAID NOZZLES; AND TWO TWISTED BOURDON TUBES EACH OF SAID TUBES HAVING RIGIDLY AFFIXED AT ONE END THEREOF TO SAID BODY AND HAVING THE OTHER END THEREOF CONNECTED TO THE PIVOT POINT OF SAID FLAPPER ASSEMBLY THEREBY TO SUSPEND SAID FLAPPER ASSEMBLY, MEANS FOR APPLYING FLUID UNDER PRESURE THROUGH SAID BODY TO AT LEAST ONE OF SAID BOURDON TUBES, SAID FLAPPER ASSEMBLY BEING MOVABLE ABOUT ITS PIVOT POINT IN RESPONSE TO VARIATIONS OF PRESSURE APPLIED TO SAID AT LEAST ONE OF SAID BOURDON TUBES THEREBY TO VARY THE POSITION THEREOF WITH RESPECT TO SAID NOZZLES TO INITIATE MOVEMENT OF SAID POWER CONTROL VALVE, SAID BOURDON TUBES BEING THE ONLY MEANS OF SUSPENSION FOR SAID FLAPPER ASSEMBLY.