JP2005055034A5 - - Google Patents

Claims (4)

After introducing a high-pressure refrigerant through a first flow path formed in the valve body, the refrigerant is expanded through an expansion valve small hole controlled to be opened and closed by an expansion valve body arranged in the valve body, and then the valve A first state led out through a second flow path formed in the main body, a high-pressure refrigerant introduced through the second flow path, and the refrigerant expanded through the expansion valve small hole, A reversible electric expansion valve capable of selectively taking a second state derived through a flow path, wherein the control of the refrigerant pressure for urging the expansion valve in the closing direction is performed by a pilot valve unit. An electrical expansion valve. 2. The electric expansion valve according to claim 1, wherein the pilot valve portion includes an electromagnetic portion that drives the pilot valve body . The valve body is provided with a first valve body and a third valve body that communicate with the first flow path, and a second valve body and a fourth valve body that communicate with the second flow path. And the second valve body communicates with a pilot valve chamber of the pilot valve portion, and the third valve body and the fourth valve body communicate with an upper valve chamber that applies a refrigerant pressure in a closing direction to the expansion valve body. 3. The electric expansion valve according to claim 1 , wherein the refrigerant in the pilot valve chamber is introduced into the upper valve chamber according to the opening degree of the pilot valve body of the pilot valve portion . The electric expansion valve according to claim 3, wherein the first valve body and the second valve body have the same configuration, and the third valve body and the fourth valve body have the same configuration .