Importance

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Abstract

A thermostatic expansion valve and a refrigerating system comprising the thermostatic expansion valve. The thermostatic expansion valve comprises a valve body arranged with an air box on the top, and the inner chamber of the air box is divided into an upper chamber and a lower chamber by a diaphragm. Within the inner chamber of the valve body there are provided a valve plug component and a valve port matched with the valve plug component. The inner chamber of the valve body is divided into a first interface chamber and a second interface chamber by a sealing line or sealing face between the valve port and the valve plug component. At the lower end part of the valve body there is provided a balance chamber to balance the valve plug component. The upper end part of the valve plug component is arranged within the lower chamber and the lower end part thereof is arranged within the balance chamber (14) of the valve body. The balance chamber is in communication with the lower chamber, and the balance chamber is in sealed isolation from both the first interface chamber and the second interface chamber. The structure of the thermostatic expansion valve is capable of reducing the systematic pressure difference to which the valve plug component is subjected, such that the regulating precision of the valve plug component is improved.

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First Claim