AirTech VCX 60 - Page 12

Problem
Probable Cause
Remedy
Insufficient Capacity (cont’d)
Improperly operating relief valve
Check the adjustment of the relief
valve. Under normal conditions, the
VCX should not have air flowing into
the relief valve if operating in the
standard range of pressures. If air is
detected entering the relief valve
(place a cardboard scrap near the
suction of the relief valve and see if
vacuum is detected – if the scrap is
held to the relief valve by the
vacuum, then the relief valve is
active). If the relief valve is active,
adjust it so that no flow is detected
at
the operating pressure, which must
be in the range of operation shown
on the data sheet.
Insufficient Vacuum
Blocked inlet mesh
(See blocked inlet mesh above)
Improperly operating relief valve
See Improperly operating relief
valve, above.
Bad gauge
Replace the gauge with a good
quality vacuum or pressure gauge.
Leaks in the system piping.
See Leaks in the vacuum piping for
VCX operation or leaks in the air
piping for PCX operation above.
Improperly sized piping.
Check the pressure at the pump
and
at the process with the same gauge.
If the pressure drop exceeds the
design value (rule of thumb is 10
percent of the operating pressure,
maximum) then the piping is too
small. Change the piping between
the pump and the process to a
larger
size.
Pump does not achieve ultimate
vacuum
Leak on the suction side
Check the piping for leaks as noted
above.
Relief valve set incorrectly.
Reset the relief valve as necessary.
Bad gauge
Replace the gauge with a better
quality vacuum gauge.