| 摘要 |
An expansion valve is disclosed herein and includes a valve body having a chamber; a valve seat and a valve core are 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 a size of a flow channel between the first opening and the second opening, wherein the valve core includes a valve core head portion facing the valve seat, the valve head portion is provided with an axial through hole, a piston is provided in the axial through hole, the piston is connected with the valve body. The piston which is connected with the valve body is provided in the axial through hole of the valve core head portion of the expansion valve. Therefore, fluid pressure may be transmitted to the valve body by the piston, so as to reduce the forces applied on the valve core, and balance the influence of differential pressure between high pressure and low pressure on the valve core more steadily, which in turn can reflect the change in the superheat degree at the outlet of the evaporator truly.
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