Patent ID: 8141579
Filing Date: 2012-03-27
Classification: F16K,G05D,Y10T

Abstract:
1. A valve having damped opening, said valve comprising a valve body having an inlet port and an outlet port, a valve stem suitable for moving between a closed position in which said stem co-operates with a valve seat so as to isolate the inlet port and the outlet port from each other, and an open position in which the stem is spaced apart from the seat so as to put the inlet and the outlet ports into communication with each other, the valve further comprising an opening control chamber for the valve stem, which chamber is suitable for being fed with fluid so as to urge the valve stem to move towards its open position, a return spring for urging the valve stem to move towards its closed position, a piston suitable for sliding in the body in a closure movement for urging contact to be established between the valve stem and the seat, the valve seat being formed on the piston and said piston being provided with a bore in which the valve stem is slidably disposed; the valve comprising, for causing the piston to move, a flow-rate limiter device for deferring the closure movement of the piston relative to the movement of the valve stem towards the open position thereof, and a damping chamber disposed in a manner such that fluid must flow out of said damping chamber in order to enable the piston to move in the closure movement thereof, the fluid flowing out via the flow-rate limiter device that is disposed between the damping chamber and the outlet port.