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A.2.8 Suction Accumulator Oil-Bleed Valve To control the relative return of oil (and some associated refrigerant) the compressor, a valve controls the liquid line exiting the suction accumulator. By opening the valve the amount of liquid returning to the compressor is increased and the exit quality from the evaporator decreased. The valve used is a 316 stainless steel rising plug valve manufactured by Whitey, part number SS-5PDF8. The maximum working pressure for the valve is 6000 psi. A.2.9 Expansion Valve A manual expansion valve was used for all R744 systems. They are supplied by Hoke and are called Bar Stock Metering Valves, model number 2311F4B. They are supplied with a micrometer vernier handle and have a maximum operating pressure of 20.7 MPa. Figure A.10 The R744 suction accumulator. The black tube pointed at the bottom of the viewing area is actually a fiber optic light source used to improve viewability A.2.10 Charging Conditions The R744 system was charged with an amount of dry CO2 sufficient to keep a visible level of liquid refrigerant in the suction accumulator. The level would be allowed to fluctuate as testing condition changed, but refrigerant would be added if the accumulator chamber completely emptied and refrigerant would be removed if the refrigerant level rose above the level of the inlet pipe. 58PDF Image | Comparison of R744 and R410A
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