Servosteering pressure control device

A servosteering control valve (1) comprising a housing (5) and valve piston (6) therein;

• flow control means (21, 22, 23, 24) coacting between said valve piston and said housing and upon being relatively shifted effects steering pressure flow from a servopump (3) and return flow to a tank (4), for a steering servomotor (2);
• said valve piston including opposed reaction chambers (16, 17) connected to be pressurized with respective servomotor pressure chambers responsive to respective steering directions;
• restrictor orifices (19, 20,;
• 45, 46) communicating with respective reaction chambers;
• inlet flow control means (31, 32) (39, 40) (42, 43) for pressurizing respective reaction chambers responsive to shifting of said valve piston by manual effort in steering a vehicle, wherein a steering mechanism is mechanically coupled to said valve piston and said servomotor;
• the improvement comprising storage means (18, 50) for receiving pressure agent from either reaction chamber and being interconnected therebetween through said restrictor orifices;
• outlet flow control means (35, 36) for respective reaction chambers connecting between said storage means and respective reaction chambers;
• wherein shifting of said valve piston in a direction opposite to a direction being steered responsive to pressure in a pressurized reaction chamber actuates the respective outlet flow control means permitting flow from a pressurized reaction chamber to said storage means thereby bypassing the respective restrictor orifice and effecting rapid response of said valve piston toward neutral position.