Ashcroft AVC-3000 Volume Controller User Manual
Ashcroft Measuring instruments
Installation and Operating
Instructions for Ashcroft
®
Pressure Volume
Controllers, Models
AVC-1000 and AVC-3000
INSTALLATION (see figure)
Step 1 –
Install a valve to the vent port on the
pressure balance valve assembly.
Step 2 –
Install a valve to the inlet port on the
pressure balance valve assembly.
Step 3 –
Install a tee fitting to the rear of the
AVC unit.
Step 4 –
Connect a pressure standard, for exam-
ple a dial gauge or digital indicator to
one side of the tee. To the other side
of the tee connect the device to be
calibrated or tested.
NOTE (Installation) –
All plumbing connections are made to
1
⁄
8
NPTF ports.
OPERATION
Step 1 –
Open the pressure balance valve.
Step 2 –
Open the vent valve.
Step 3 –
Turn the control knob to approximately
midrange. This will allow for increase
and decrease of system pressure.
Alternatively, the starting position of the
knob may be at the counterclockwise
or clockwise stop. This will allow for
maximum pressure increase (knob at
the counterclockwise stop) or maximum
pressure decrease (knob at clockwise
stop).
Step 4 –
Close the vent valve.
Step 5 –
Open the inlet valve to provide pressure
to approximately the desired pressure
level.
Step 6 –
When the appropriate pressure has
been achieved, close the inlet valve.
Step 7 –
Close pressure balance valve.
Step 8 –
Turn control knob clockwise to increase
system pressure or counterclockwise to
decrease system pressure.
NOTE (Operation) –
During operation the pressure balance
valve will automatically open if the pres-
sure across the piston exceeds safe
levels. This is factory set at a nominal
pressure differential of 150 psi.
DEVICE
UNDER
TEST
PRESSURE
MEASURING
DEVICE
AC
ATMOSPHERE
PRESSURE
SOURCE
REGULATOR
INLET VALVE OR
REGULATOR
VENT VALVE
CONTROL KNOB
PRESSURE
BALANCE
VALVE
© Ashcroft Inc., 250 East Main Street. Stratford, CT 06614, USA Tel: 203-378-8281, Fax: 203-385-0402 www.ashcroft.com,
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