Patent ID: 7316384
Filing Date: 2008-01-08
Classification: F16K,F25B,Y02B

Abstract:
1. An electric control valve, comprising: a valve chamber having a flat valve seat surface, on which a groove is formed, for setting a throttled flow rate variably; and a valve body, an end surface of which opposes to the valve seat surface, being arranged rotatably in the valve chamber; an electric actuator, wherein the valve body is rotated by the electric actuator to a predetermined position, said position determining the throttled flow rate quantitatively by the groove, characterized in that, the valve seat surface is provided with said groove, a band-shaped border band being provided around the groove and drawing an outline of the groove and a depression arranged around the border band, said border band projecting from the groove and the depression, and the end surface of the valve body contacts slidingly on a top surface of the border band, the groove extends in a circular arc shape in a rotating direction of the valve body and is a groove having a bottom, which groove has a uniform depth and a width that changes gradually in an extending direction, the groove communicates at a side of maximum dimension of the width to a full-open port formed on the valve seat surface, and the depth of the groove is equal to that of the depression arranged around the border band.