Back pressure regulating valve and an electric type of a scroll compressor with the same

A valve of an electric scroll compressor for regulating a back pressure, comprising:

• a valve housing including a first housing, a second housing and a communicating passage for connecting the first housing to the second housing;
• and
• a piston including a first piston located within the first housing, a second piston located within the second housing and a connecting rod for connecting the first piston to the second piston,
• wherein the piston is configured to move up and down within the first and the second housing,
• wherein the cross sectional size of the second housing is bigger than that of the first housing, and
• wherein a first housing upper cylinder is connected to a discharging chamber, a first housing lower cylinder is connected to a back pressure chamber, a first back pressure chamber communicating passage is formed at a side of the first housing for the first housing upper cylinder to communicate with a back pressure chamber when the piston reaches at a bottom dead center, a second upper cylinder is connected to a suction chamber and a second lower cylinder is connected to the back pressure chamber, and a first suction chamber communicating passage is formed at a side of the second housing for the second housing lower cylinder to communicate with the suction chamber when the piston reaches at a top dead center.