Mowing machine hydraulic drive control valve - has passage in rotary piston throttling one outlet to increase pressure to other

摘要

The control valve with rotary piston is particularly for the hydraulic drive to a mower, having a fluid inlet and two or more cutlets connected to the drive units concerned. The piston (12) incorporates a passage (13) of cross-section and position such that, in one angular position of the piston it reduces the cross-section of one of the cutlets (15), thus generating in the valve a rise in pressure for the other cutlet (16). This enables power units needing supply at different pressures to be fed simultaneously.