Valve device for hydraulic system has casing containing stepped hydraulic piston

摘要

The valve device (5) has a casing (10) containing a stepped hydraulic piston (9), the larger endface (12) of which is subject to the pressure in the store (1), while the smaller one (13) is subject to the pressure of a storage container (3), bounding an annular cavity (26) which is subject to the pressure supplied by the pump.