Drum Level Glass

I would blame the valves, not the drum level sight glass. Check the valve handle orientation to ensure they are mounted properly. The sight glass should only be a visual double check to ensure your sensor readings are accurate on the water / steam level in the drum.

Drew K

• Gravity
  
• Fail Safe

Should the packing be loose and thus let the handles "fall", the valve will always be open. Kind of silly since the steam/water will also be passing at that point (or shortly thereafter) but, the intent of the ancient boiler designers is clear.

I can't remember the exact reason but I do believe that it is some kind of standard.

Swimming Pool valves are exactly the same

Cheers

Joe