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Automatic Control Valve
Operation & Maintenance Manual
Model C501/CA501 Surge Arrestor Valve
The Model 501 Surge Arrestor Valve controls over pressure and under pressure conditions. The pilot operated
control valve opens quickly to dissipate high surge pressure that exceeds a predetermined relief pressure setting
that can occur during pump start. The control valve also opens quickly for low surge pressure conditions that
can occur during normal pump shut down, electric power failure, and pump failure. The control valve will
continue to remain open following low surge pressure conditions to dissipate return pressure surges. The
control valve will close smoothly at an adjustable speed once system pressure has recovered within the normal
operating pressure zone above the low surge pilot setting or below the high surge pressure pilot setting.
Part List
1. Shut-Off Valve (3)
2. Strainer
3. Orifice
4. Pilot Valve (Over Pressure)
5. Pilot Valve (Under Pressure)
6. Air/Vacuum Valve
7. Accumulator
8. Needle Valve or Flow Control
9. Testcock
SHIPMENT:
When shipped, controls are usually mounted
on the main valve. If control subassemblies
are shipped separately, all connections are
tagged to insure correct assembly.
INSTALLATION:
1. Model C501 is installed on a "Tee" from
the main line into atmosphere (waste).
2. Flush the pipeline before inserting the
valve.
3. Install the valve with the "arrow" on body
pointing in the direction of flow (waste).
4. Attach subassemblies to main valve if
necessary.
5. Allow enough clearance above valve for
removal of piston assembly.
STARTUP AND ADJUSTMENT:
1. Install pressure gauge to observe inlet pressure.
2. Model C501 requires manual closure to bring the valve on-line. Open Shut-Off Valve (1A) and close
Shut-Off Valve (1B). Re-open Shut-Off Valve (1B) after surge arrestor valve closes following step 4
or 5 to put the valve into automatic operation.
WARNING: Shut-Off Valve (1B) on downstream side must always be open for normal operation;
otherwise, main valve will not
3. Slowly open main line inlet side shut-off valve about 1/8 open and observe pressure gauge.
15 Pruyn's Island Drive
Glens Falls, New York 12801
Phone: (800) 833-2040
function.
WWW.FLOMATIC.COM
High Quality Valves Built to Last...
MANUAL: C501 REV: 4