Patent ID: 9599248
Date: 2017-03-21
CPC Classifications: F15B,F16K,Y10T

Claim:
1. A mechanism for implementing a delay in a directional control valve in the movement of a valve spool within a valve body from a first position of the spool to a second position of the spool through a third position of the spool, where the third position of the spool is located between the first and second positions, where: the valve spool transits between the first and third positions and between the second and third positions at a first velocity; the mechanism is located within the spool; the mechanism is a fluid damping mechanism; the mechanism comprises a piston assembly, which remains fixed relative to a valve body, such that the valve spool moves over the piston assembly as it moves within the valve body; the spool contains a bore through the length of the spool; and the spool bore contains at least one region in which the bore has a smaller diameter relative to the remainder of the bore.