Jordan Valve Mark 6127 Series Pressure Reducing Valves - Manual (Page 4)

C. MAIN VALVE OPEN AND CLOSES, BUT
DOES NOT CONTROL DOWNSTREAM
PRESSURE:
1. If pressure remains too high despite adjustment
of the pressure-reducing pilot, refer to
MAIN VALVE FAILS TO CLOSE, above.
2. If pressure remains too low despite adjustment
of the pressure-reducing pilot, refer to MAIN
VALVE FAILS TO OPEN, above.
3. If pressure oscillates, you may likely be in a
period of very low demand. Frequently this
problem will disappear as demand increases.
In the meantime, further closing of the flow
control valve may help damp out the oscillations.
In an extreme case, try adjusting the
pressure slightly higher.
D. MAIN VALVE OPENS AND CLOSES BUT
DOES NOT SUSTAIN UPSTREAM PRESSURE.
1. Pressure-sustaining pilot adjusted too far coun-
terclockwise. See Adjustment instructions.
2. Stem of pressure-sustaining pilot binding or
seat deteriorated. Disassemble pilot and deter-
mine cause.
Jordan Valve, a division of Richards Industries
3170 Wasson Road • Cincinnati, OH 45209
513.533.5600 • 800.543.7311 • 513.871.0105 (f)
[email protected] • www.jordanvalve.com
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