Engine : Expired / Refrigeration AC - 124/252
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| Refrigeration system isolation valves are specially designed with a back-seat, as well as a front-seat. For what purpose are these valves designed in this way? |
| A) permit repacking the valve stem under pressure without shutting down |
| B) allow for operation as a suction or discharge valve |
| C) allow for operation as a liquid or vapor valve |
| D) allow for removal and replacement of the valve without shutting down |
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