Cross line relief mechanism for reversible hydraulic motor

Claim 1

IN A HYDRAULIC CONTROL INSTRUMENTALITY OF THE TYPE COMPRISING A BODY HAVING A PAIR OF LINE PASSAGES EACH CONNECTABLE WITH ONE SIDE OF A REVERSIBLE HYDRAULIC MOTOR, CROSS LINE RELIEF MEANS FOR TRANSFERRING HYDRAULIC PRESSURE FLUID FROM EITHER LINE PASSAGE IN WHICH AN ABNORMALLY HIGH PRESSURE DEVELOPS TO THE OTHER LINE PASSAGE, COMPRISING: (A) A TRANSFER PASSAGE IN THE BODY TO COMMUNICATE THE LINE PASSAGES WITH ONE ANOTHER AND CONNECTING ONLY THEREWITH; (B) ANNULAR VALVE SEATS IN THE TRANSFER PASSAGE, ONE FOR EACH LINE PASSAGE, SPACED FROM ONE ANOTHER ALONG THE LENGTH OF THE TRANSFER PASSAGE AND EACH DEFINING A CONNECTING PASSAGE THROUGH WHICH ITS LINE PASSAGE IS COMMUNICABLE WITH THE TRANSFER PASSAGE, SAID VALVE SEATS FACING IN THE DIRECTION THAT FLUID FLOWS THERETHROUGH FROM THE LINE PASSAGES TO THE TRANSFER PASSAGE; (C) AND A BI-DIRECTIONAL VALVE UNIT MOUNTED IN THE BODY AT A LOCATION OPPOSITE EACH VALVE SEAT, AND WHOLLY OUTSIDE ITS LINE PASSAGE, SAID VALVE UNITS COMPRISING (1) POPPET MEANS IN EACH VALVE UNIT PROJECTING FORWARDLY THEREFROM INTO THE TRANSFER PASSAGE TOWARD ITS VALVE SEAT FOR COOPERATION THEREWITH AND TO NORMALLY BLOCK FLUID FLOW THROUGH THE CONNECT-/ ING PASSAGE DEFINED THEREBY, (2) MEANS IN EACH VALVE UNIT RESPONSIVE TO PRESSURE OF FLUID AT AN ABNORMALLY HIGH VALUE IN ITS LINE PASSAGE FOR EFFECTING REARWARD ACTUATION OF ITS POPPET MEANS TO ESTABLISH RELIEF FLOW OF FLUID THROUGH ITS CONNECTING PASSAGE TO THE TRANSFER PASSAGE, (3) AND MEANS IN EACH VALVE UNIT RESPONSIVE SOLELY TO THE PRESSURE OF SUCH RELIEF FLUID IN THE TRANSFER PASSAGE FOR EFFECTING REARWARD ACTUATION OF ITS POPPET MEANS TO ENABLE SUCH RELIEF FLUID IN THE TRANSFER PASSAGE TO FLOW THROUGH ITS CONNECTING PASSAGE TO THE ASSOCIATED LINE PASSAGE.