Patent ID: 8770547

Claim:
A fluid control valve comprising: a resin valve body formed with a first passage and a second passage that are communicated with each other through a valve chamber; a resin valve upper part connected to an upper surface of the valve body; and a resin diaphragm valve element held between the valve body and the valve upper part, wherein the valve body is internally formed with a valve hole located in a bottom of the valve chamber and in which the first passage opens, the valve body has a valve seat around the valve hole, with which the resin diaphragm valve element comes into or out of contact, the first passage includes (1) a port communication passage of a cylindrical shape having one end communicating with a port provided in the valve body and (2) a valve-hole communication passage of a cylindrical shape having one end communicating with the valve hole, the port communication passage and the valve-hole communication passage being communicated with each other at a predetermined angle, a connecting part between the port communication passage and the valve-hole communication passage is internally formed with a curved surface having a tapered shape, and the second communication passage is in uneven parallel to the port communication passage and has one end in communication with a second port and an other end opening in a side wall of the valve chamber.