Patent ID: 7204271
Filing Date: 2007-04-17
Classification: F16K,Y10T

Abstract:
1. An electric switching valve comprising, a valve chamber having a plurality of valve ports opened on a flat bottom wall thereof, a valve body disposed rotatably in the valve chamber, slidably contacting the bottom wall of the valve chamber at an end wall thereof, and switching connections between the valve ports corresponding to a rotational position thereof, and an electric actuator for rotating the valve body, wherein the bottom wall of the valve chamber includes a laminated structure having a bottom cover to which pipe fittings are connected, a valve seat on which the valve ports are opened and to which the valve body slidably contacts at an end wall thereof, an intermediate plate having communication openings, for connecting the pipe fittings to the valve ports, interposed between the bottom cover and the valve seat, wherein at least one of the valve ports is biased in a radial direction of the rotating valve body against the center of the corresponding pipe fitting, wherein a stepping motor works as the electric actuator, of which rotor is engaged with the valve body for conveying torque, wherein a tapered center hole drilled on the valve body works as a rotation center with which a center shaft is rotatably engaged, wherein the tapered center hole allows the valve body to oscillate about the center shaft, wherein the valve body is pressed by a spring against an opening wall of the valve port.