m
CORPORATION
MUNCIE, INDIANA, USA
INDUSTRIAL COMBUSTION EQUIPMENT AND VALVES
Maxon practices a policy of continuous product improvement. It reserves the right to alter specifications without prior notice.
Hot
Shut-off
Valve #1
Neutral
Shut-off
Valve #2
LS-SV
From Flame
Safeguard
Momentary Leak
Test Push Button
Page 6100-S-12 Electro-Mechanical Valves
Maintenance Instructions
Example of a gas piping diagram for leak test
CAUTION: Valve leak testing should be under-
taken only by trained and experienced personnel.
Instructions provided by the company and/or
individuals responsible for the manufacture and/or
overall installation of complete system incorporat-
ing Maxon valves take precedence over these
provided by Maxon. If Maxon instructions conflict
with any codes or regulations, contact Maxon
Corporation before attempting this procedure.
Valve leak test should be performed on a
quarterly basis to assure continued safe and
reliable operation. Each valve should be checked
with available line pressure. Absolute zero leakage
may not be obtained in the field. Any valve that
exceeds the allowable leakage, as set forth by your
local codes or insurance requirements (15 bubbles
per minute), should be removed from service and
your Maxon representative should be contacted.
Every Maxon valve is operationally tested and
meets the requirements of ANSI B16.104 Class
VI seat leakage when it leaves our plant.
Suggested leak test procedure for
double-blocking shut-off valves (without
vent line)
(a) Shut down combustion system per manufacturer’s
recommended procedure.
(b) Close manual valves A and B.
(c) Visually inspect to verify that shut-off valves #1
and #2 are closed.
(d) Remove the 1/4” pipe plug from downstream side
of shut-off valve #1. Install leak test apparatus.
Safely vent any trapped gas pressure.
(e) Open manual shut-off valve A, then close leak
test apparatus. Insert tube into a container of
water just below the surface.
(f) Open test apparatus and test valve for leakage.
As a guideline, valve should be tested for 2
minutes per inch of pipe diameter. Large diameter
pipes or long piping runs between shut-off valves
may need additional testing time.
(g) If valve testing indicates leakage exceeding 15
bubbles per minute, perform pre-operational
exercising as outlined on Page 6100-S-2 and
retest the valve. If valve continues to exceed
allowable leakage limit, remove from service and
contact Maxon.
Example of a wiring diagram for leak test
NOTES:
Push button must be tamper resistant.
LS-SV – Closes when Shut-off Valve #1
is fully open.
The “From Flame Safeguard” line is
energized only when all conditions for
safe operation have been satisfied.
Manual
Valve
A
Manual
Valve
B
Shut-off
Valve
#1
Shut-off
Valve
#2
Gas Pressure
Regulator
To Combustion
System
LGP
Switch
HGP
Switch
Strainer
Drip
Leg
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