HYDRAULICALLY SWITCHABLE DIRECTIONAL CONTROL VALVE

The distribution valve 10 comprises a valve piston 12, coupled with this a means of sealing 15; 18 and a control piston 13, where the return port R can be closed off from the control piston 13, and where, after opening of the means of sealing 15; 18 the fluid connection can be made from the high pressure port P to the load port A. With control pressure present the control piston 13 can be displaced from its initial position, via an intermediate position, into an end position, where as a function of the position the fluid connection between the load port A and the return port R can be unrestricted or closed off. The valve piston 12 comprises, displaced towards the end face 26 from a first radial aperture 29 , a second radial aperture 28; the first radial aperture 29 can be closed by the control piston 13 when the latter arrives at an intermediate position. Between the valve piston 12 and its guide a restricting section can be formed.