Engine : Refrigeration AC - 687/610 |
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When opening or closing compressor service and line isolation valves on a typical refrigeration system that is fitted with packed valves, what must you do? |
A) you must first remove the stem seal cap |
B) you should replace the gasket each time the valve position is changed |
C) you should never loosen or tighten the packing gland |
D) you should turn valves slowly to avoid thermal stresses due to low temperatures |
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