Patent ID: 7357373

Claim:
A pilot-type two-port valve comprising: a valve part having a valve seat formed in a liquid flow path for connecting a first port and a second port and a valve member for opening and closing the valve seat; and a valve driving mechanism for driving the valve member by pilot fluid pressure, the valve driving mechanism having a rod which passes through an insertion hole of a plate facing on the liquid flow path in a sealed state and having a tip end protruding in the fluid path, and a tip end of the rod being connected to the valve member; wherein to the part protruding in the liquid flow path, a cap is provided which abuts against the periphery of the insertion hole of the plate when the valve member opens the valve seat and prevents intrusion of foreign material in the liquid into the insertion hole wherein said cap includes a flange abutting against the periphery of the insertion hole for preventing intrusion of foreign material into the seal part of the insertion hole, and wherein a fine path is provided on the flange interposed between the flange and the plate and communicates with the inside and outside of the cap when the flange abuts against the periphery of the insertion hole in the plate, the cap is fitted within the valve member, and wherein the valve member is attached to the tip end of the rod through the cap.