Hydraulic valve control device

摘要

A motor-operable fluid valve for a pump includes a valve body defining an open central portion, at least one high pressure inlet port in fluid communication with the open central portion, a plurality of lower pressure inlet and/or outlet ports in fluid communication with the open central portion via an array of flow passages, and a valve rotor having a plurality of openings and movably disposed within the open central portion between the line of flow from the high pressure to the lower pressure ports. The valve rotor further includes a centrally mounted shaft operable to selectively connect inlet and outlet ports; said valve further comprising a rotational means on the shaft of the valve rotor and a drive gear cooperative with the rotational means and comprising a top face and a bottom face, the top face being sloped so as to form a cam such that when the drive gear is rotated the rotational means may be raised and lowered by the camming action.