The（） is fitted in pair one is the main valve, the other the auxiliary or standby.<br>A:main stem stop valve<br>B:auxiliary steam stop valve<br>C:feed check or control valve<br>D:blow down valve

The（） is fitted in pair one is the main valve, the other the auxiliary or standby.
A:main stem stop valve
B:auxiliary steam stop valve
C:feed check or control valve
D:blow down valve

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