Patent ID: 6984113

Claim:
An oil pressure operated pump for marine steering gears comprising: a) a multiple piston oil pressure operated pump controlled by a steering wheel connected with a mobile shaft, the multiple piston oil pressure operated pump including a double acting oil pressure cylinder acting in response to movement of the mobile shaft for controlling a direction of an engine or rudder of a boat, b) a valve housing mounted under the multiple piston oil pressure operated pump, c) a bottom cover closing the valve housing from below, d) the valve housing and the cover each including: i) channels, ii) threaded holes for reciprocal fastening of the valve housing and cover together and for fastening of the valve housing to the multiple piston oil pressure operated pump by bolts, iii) non-threaded bores for oil pressure connections, iv) each of said cover and valve housing being obtained by one of: A) pressure die-casting in one of an aluminium alloy and zinc alloy, and B) pressure molding in a thermoplastic material, e) a valve set lodged in the valve housing for non-return and adjustment of oil flow, the valve set including: i) a generally parallelepiped shaped tubular shell fit in said valve housing and having: A) a generally square shape about a periphery thereof in traverse cross-section, B) a central tubular through-hole, and C) lathe-turned ducts, ii valves mounted in the tubular shell for controlling fluid flow to the double acting oil pressure cylinder and thereby movement of the shaft, in such a manner that the valve set with the valves assembled therewith can be inserted into and removed from the valve housing as a unitary element.