Patent ID: 9109822
Filing Date: 2015-08-18
Classification: F16K,F25B

Abstract:
1. An expansion valve, comprising: a valve body having a chamber; a valve seat and a valve core provided in the chamber; a first opening and a second opening in communication with the chamber, wherein the valve core moves relative to the valve seat to control size of a flow channel between the first opening and the second opening, wherein the valve core comprises a valve core head portion facing the valve seat, the valve core head portion comprises a valve core surface for cooperating with the valve seat to open or close a valve port of the valve seat, an axial through hole is provided in the valve core head portion, a smallest cross-section area of the axial through hole is more than 0.6 times and less than 1 times of a largest flow area at a valve port of the valve seat, and a piston is provided in the axial through hole, and is connected with the valve body.