In its simplest form the pressure reducing valve is opened or closed by （） which is balanced by the downstream pressure acting on a diaphragm.<br>A:adjusting a nut<br>B:a pre-tensioned spring<br>C:any spring<br>D:upstream pressure

In its simplest form the pressure reducing valve is opened or closed by （） which is balanced by the downstream pressure acting on a diaphragm.
A:adjusting a nut
B:a pre-tensioned spring
C:any spring
D:upstream pressure

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