Rotary valve with bypass

Claim 1

IN A POWER STEERING GEAR, A HOUSING HAVING A CYLINDRICAL PORTION, A PISTON RECIPROCABLE IN SAID CYLINDRICAL PORTION, A ROTATABLE TUBULAR DRIVEN SHAFT EXTENDING COAXIALLY THROUGH SAID PISTON, MEANS FOR INTERCONNECTING SAID PISTON AND ONE END OF SAID DRIVEN SHAFT TO ROTATE THE LATTER UPON RECIPROCATION OF SAID PISTON, VALVE MEANS CARRIED BY SAID SHAFT TO ROTATE THEREWITH, A CYLINDRICAL INNER VALVE MEMBER ROTATABLE COAXIALLY WITHIN THE BORE OF SAID SHAFT, SAID VALVE MEMBER HAVING A CHAMBER THEREIN IN COMMUNICATION WITH A SOURCE OF PRESSURIZED FLUID, ROTATABLE DRIVING MEANS EXTENDING AXIALLY INTO THE OTHER END OF SAID TUBULAR SHAFT AND COUPLED WITH SAID INNER VALVE MEMBER TO ROTATE THE SAME RELATIVE TO SAID SHAFT, A LOST MOTION CONNECTION BETWEEN SAID DRIVING MEANS AND SHAFT FOR ROTATING THE LATTER AFTER PREDETERMINED ROTATION OF SAID DRIVING MEANS, WORK CONDUIT MEANS IN COMMUNICATION WITH OPPOSITE SIDES OF SAID PISTON, DRAIN CONDUIT MEANS, SAID WORK AND DRAIN CONDUIT MEANS BEING COOPERABLE WITH SAID VALVE MEANS AND VALVE MEMBER FOR SELECTIVELY INTERCONNECTING SAID CYLINDRICAL PORTION OF SAID HOUSING AT ONE SIDE OR THE OPPOSITE OF SAID PISTON WITH SAID CHAMBER AND FOR SIMULTANEOUSLY INTERCONNECTING SAID CYLINDRICAL PORTION AT SAID OPPOSITE OR ONE SIDE OF SAID PISTON WITH SAID DRAIN CONDUIT, MEANS SAID DRIVING MEANS INCLUDING A TUBE COAXIAL WITH SAID TUBULAR DRIVEN SHAFT, MEANS WITHIN SAID OTHER END OF SAID TUBULAR DRIVEN SHAFT CONNECTING SAID VALVE MEMBER WITH AN INNER END OF SAID TUBE FOR ROTATION TOGETHER AS A UNIT, A TORSION ROD EXTENDING COAXIALLY WITHIN SAID TUBE AND HAVING AN INNER END SECURED TO SAID INNER END OF SAID TUBE FOR ROTATION AS A UNIT THEREWITH, AND MEANS INTEGRALLY CONNECTING THE OUTER END OF SAID TORSION ROD WITH SAID DRIVEN SHAFT FOR ROTATION AS A UNIT THEREWITH.