Valve device for a hydraulic motor adapted to drive a high inertia mass

A valve device for at least one hydraulic motor adapted to drive a high inertia load, the motor having two main ducts, respectively for supply and exhaust of fluid, said ducts being configured and adapted to be obturated for stopping the motor, the valve device further comprising two main conduits, for connection to each of said two main ducts;

• the valve device further comprising valving means and control means configured and adapted to control said valving means whereby said main conduits are placed into a communication mode, in which said main conduits communicate through said valving means when fluid pressures in said main conduits are substantially equal, and whereby said main conduits are placed into an isolation mode, in which said main conduits are isolated from one another by said valving means when the fluid pressures in said main conduits are different, and
• the valve device further comprising delaying means, configured and adapted to limit the speed of passage of fluid between said communication mode and said isolation mode.