Patent ID: 7438088

Claim:
An electromagnetic pilot type directional control valve, comprising: a main valve section having a housing of a rectangular shape in cross-section, the housing being provided with a supply port, an output port, and a discharge port for main fluid, a spool configured to switch a flow channel among these ports, and a piston and a pilot pressure chamber configured to drive the spool; a valve adapter mounted on a top surface of the housing; a pilot operating unit installed on the top surface of the housing via the valve adapter and configured to supply pilot fluid to the pilot pressure chamber by a pilot valve to drive the spool, wherein the pilot operating unit comprises: the electromagnetic operated pilot valve mounted on the valve adapter, a printed circuit board arranged above the pilot valve and electrically connected to the pilot valve, and a protective cover mounted airtightly to the top surface of the housing and configured to cover the valve adapter, the pilot valve, and the printed circuit board entirely, wherein the valve adapter is in a plate shape elongated in a direction of an axis of the housing, and the valve adapter includes two valve mounting sections that are configured to mount the pilot valve on the top surface thereof at relative positions, and the valve adapter includes a relay hole that is configured to bring the pilot valve into communication with respective pilot flow channel ports opening on the top surface of the housing, and the top surface of the housing is formed with a recess having substantially the same shape as the valve adapter and a cover mounting surface around the recess, so that the valve adapter is fit within the recess with a first gasket mounted therebetween, a pilot supply flow channel that is led up to the supply port in cooperation with the top surface of the housing is defined, and the protective cover is mounted to the cover mounting surface via a second gasket.