HYDRAULISCHES PILOTVENTIL.

摘要

A hydraulic pilot valve designed so as to control the discharge rate of a pilot pressure oil at a constant level accurately in accordance with the stroke of an operating lever irrespective of the operating speed of the operating lever, and used to supply a pilot pressure oil by a pilot-operated change-over valve adapted to be switched by a pilot pressure oil. This hydraulic pilot valve has a valve spool (23) which can be slidingly moved between a first position, in which a pilot pressure oil from a pilot pressure oil supply pump (27 is discharged to an outlet port (26) formed in a valve body (1), and a second position, in which the outlet port communicates with a drainage tank port (30), and the operating power of an operating lever (38) for slidingly moving this valve spool (23) is transmitted to the valve spool (23) by utilizing the damping effect.