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A variable capacity compressor, designated the TRV, was developed by applying an intermediate stage bypassing method to the already proven SCROLL compressor. The purposes were: 1. to attain better temperature control 2. to reduce the horsepower requirement and to eliminate the torque surge 3. to accomplish continuous capacity control in a wide operating range 4. to maintain an excellent cool down with a very limited chance of cycling for the minimum displacement of 25%, and 5. to utilize the SCROLL machine concept for low noise and smooth operation. Experimental data of the compressor and A/C system simulation results were discussed to show that all the expected features were realized.