The（） is a smaller valve fitted in the auxiliary steam supply line, and is usually of the non-return type.<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 a smaller valve fitted in the auxiliary steam supply line, and is usually of the non-return type.
A:main stem stop valve
B:auxiliary steam stop valve
C:feed check or control valve
D:blow down valve

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