4)caused by a rotating disc.
If al! the previously mentioned checks prove satisfactory then
the meter must be removed from the fine and dismantled and
inspected as detailed in maintenance sections.
Possible causes of imperfect operation ore:
I) A fractured disc or balls allowing the passing of
unmetered fluid.
2) Resistance to motion of the disc due to:
- Particles of foreign matter embedded in the working
surfaces of the meter.
- A "gummed up" meter due to ineffective
temperature control or settling out during
"shut'off". - A distorted disc due to operation at
temperatures in excess of the maximum
permitted.
- Worn barrier or roller allowing the disc to
"
cock
"
during operation are not in the right position. -
Bent disc pegs due to excessive pressure drop
across the meter
Pag.10
