HYDRAULIC HYBRID ACCUMULATOR SHUT-OFF VALVE

摘要

A hydraulic accumulator (14) is equipped with a novel shut-off valve. The sh ut off-valve includes a valve body (21) having a cylindrical hollow with a valv e seat (37) surrounding one end. The main piston (24) including a piston head has a central opening (30) and is slidably mounted within the cylindrical hollow of the valve body. A poppet valve (22) has a valve head which mates with the valve seat and a valve stem which extends through the central openi ng of the piston to guide axial movement of the poppet valve relative to the piston. A spring (23) is mounted between the valve head and the main piston head for urging the valve head away from the piston head. A control valve (2 7) moves the piston relative to the valve body between open and closed position s responsive to signals from a computer (72) which signals valve closing upon determination that flow rate through the valve exceeds a maximum period. The spring between the poppet valve head and the piston head exerts a force approximately equal to that of a pressure drop across the poppet valve at a predetermined maximum flow rate.