VORSTEUERVENTIL.

摘要

An object of the present invention is to provide a pilot valve at low costs, which does not require excessive electrical wiring and pressure oil piping and has improved reliability. In the said pilot valve, a valve body (1) is provided with a change-over spool (27) movably disposed between a first position where a pair of outlet ports forwardly communicate with a pair of main outlet ports and a second position where the former reversely communicate with the latter, and this change-over spool (27) is made movable by pressure oil of another pair of outlet ports between the first and the second positions, so that a rocking direction of a lever and an outlet direction of the oil pressure can be reversed without using a switch, wiring and piping.