Abstract: A pilot valve assembly comprised of a pilot valve proper employing a spool to be displaced in a valve casing to bring a hydraulic pressure port and an output port into and out of communication with each other, an operation means having an operating lever with a cam member attached thereto, a pivoting shaft erected on an end plate of the pilot valve proper and connected with the manual operating lever through a universal joint, and a boot of a resilient material hermetically connected between the operation means and the end plate in such a way as to completely enshroud said universal joint, cam member and pusher, the end plate being detachably fixed to the mount member, and the boot having one end thereof connected to the operation means and having the other end hermetically gripped between the end plate and the mount member.

Abstract: A pilot valve assembly comprised of a pilot valve proper employing a spool to be displaced in a valve casing to bring a hydraulic pressure port and an output port into and out of communication with each other, an operation means having an operating lever with a cam member attached thereto, a pivoting shaft erected on an end plate of the pilot valve proper and connected with the manual operating lever through a universal joint, and a boot of a resilient material hermetically connected between the operation means and the end plate in such a way as to completely enshroud said universal joint, cam member and pusher, the end plate being detachably fixed to the mount member, and the boot having one end thereof connected to the operation means and having the other end hermetically gripped between the end plate and the mount member.