Patent ID: 7537194
Filing Date: 2009-05-26
Classification: F16K

Abstract:
1. A flow control valve for controlling a flow rate, comprising: a valve body made of resin including: a valve element movable into contact with and away from the valve seat; a valve chamber formed around the valve seat; a second passage communicating with the valve chamber; and a flow adjustment rod for adjusting a flow rate of a fluid allowed to flow in the valve chamber, wherein the flow adjustment rod is adjustable in position to change an opening degree of the valve element relative to the valve seat for adjusting the flow rate which is determined by a distance between an edge of the valve port and a needle of the valve element, the flow control valve further comprises an annular recess formed in an inner periphery of the valve seat formed surrounding the valve port and configured to prevent radial deformation of the valve port when the valve element is moved into contact with the valve seat, the annular recess being configured to have a first surface parallel to a center line of the valve port and a second surface perpendicular to the center line of the valve port, and the valve seat is formed with an outer peripheral surface tapered at an angle larger than an inner peripheral surface.