A hydraulic double magnet valve (20) has a rod which when moved in one direction and rotated, a sleeve and the rod form a press seat with rotation between the sleeve and a projection on a linkage. This causes the lever to exert force on a pin/dowel of one of the magnets, and so operates the valve in one direction. If the rod is moved in the opposite direction and rotated, then the sleeve is removed from the opening of that linkage and forms a press seat with the other side of the linkage, to operate the lever at the other end of the valve. Force is thereby exerted on the other pin and holds it in position after the valve slide has moved in the opposite direction.
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