Engine : Expired / Refrigeration AC - 542/252
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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 should replace the gasket each time the valve position is changed |
| B) you should never loosen or tighten the packing gland |
| C) you must first remove the stem seal cap |
| D) you should turn valves slowly to avoid thermal stresses due to low temperatures |
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