2
Installation and Maintenance Instructions
Model 441-S Regulator
Maximum
Working
Maximum
Regulator
441 Body
Pressure
Inlet
Body Type
Materials
of Body
Pressure
Cast Iron
Screwed End
(ASTM A126-71
250 psi
(2" Pipe Size Only)
Class B)
Cast Iron
Flanged
(ASTM A126-71
175 psi
ANSI 125 FF
Class B)
100 psi
Ductile Iron
Flanged
(ASTM A395-71
575 psi
ANSI 250 RF
gr 60-40-18)
Cast Steel
Flanged
(ASTM A126-70a
720 psi
ANSI 300 RF
gr WCB)
Installation and Start-Up
1
Thoroughly purge inlet piping to remove dirt and debris which
could damage the regulator or impair its operation. If this
cannot be done, a filter or strainer should be installed ahead
of the regulator.
Make certain that regulator is free of any dirt or foreign matter
that might have collected.
2
Place regulator in the line with high pressure connected to the
inlet side (be sure that shipping screens or covers, if used,
are removed from the inlet and outlet).
Tighten bolts on flanges evenly.
Where required, the regulator may be inverted.
CAUTION
It is the user's responsibility to assure that all regulator vents
and/or vent lines exhaust to a non-hazardous location away from
ANY POTENTIAL sources of ignition. Where vent lines are used,
it is the user's responsibility to assure that each regulator is
individually vented and that common vent lines ARE NOT used.
3
From the 1/2" union
60
extend pipe or tubing to the control
connection into the outlet piping. This control piping should
not be less than 1/2" in size and should be adequately
protected against breakage (regulators go wide open if the
control line is broken).
The regulator will work to deliver the pressure, for which it is
adjusted, at that point in the outlet piping where the control
connection is located.
In general, the control connection should be at least 8 pipe
diameters from the regulator and should be in as straight a
run of pipe as possible.
The control connection should be clean and smooth,
free of rough edges, welding “icicles”. etc.
4
Where outlet piping increases in size near the regulator,
it is generally preferable to locate the control connection in
the larger size.
The 1/2" union
60
contains a small orifice, approximately
1/16" diameter. This orifice should not be removed. Also,
make certain this orifice is open and free of foreign material.
Check all connections for leaks.
CAUTION
Turn gas on very slowly. If an outlet stop valve is used,
it should be opened first. Do not overload the diaphragm with a
sudden surge of inlet pressure. Monitor the outlet pressure
during start-up to prevent an outlet pressure overload
.
5
Put the regulator into operation as follows: (refer to page 8)
a.
Slowly open the downstream control line valve (A).
b.
Slowly open the downstream block valve (B).
c.
Very slowly open the upstream block valve (C).
d.
Set the adjusting screw
10
for the required outlet pressure.
Turn it clockwise to increase the pressure counterclockwise
to decrease it. Only make this adjustment when gas
is actually flowing through the regulator.
e.
After adjustment is complete, the locknut
11
should be
tightened firmly and the seal cap
1
replaced.
6
To shut down, carefully close valves
C
,
B
, and
A
in that order.
CAUTION
The diaphragm case vent must be positioned to protect against
flooding, drain water, ice formation, traffic, tampering, etc. The
vent must be protected against nest building animals, bees,
insects, etc. to prevent vent blockage and minimize the chances
for foreign material from collecting in the vent side of the
regulator diaphragm.
7
The vent connection is an escape path for flammable gas
and it must be located and/or piped so that potential
discharge occurs in a safe area away from buildings,
open flames, collection areas, arcing devices, etc.
Regulators that are installed indoors or in a non-vented
area must be vented to the outside. Simply run vent piping
from the regulator vent connection to a non-hazardous
location on the outside away from ANY POTENTIAL sources
of ignition. The vent piping must be connection size
or larger and piped to a safe area. The vent discharge
must be protected against the potentials outlined
in instructions #2 and #10.
8
For outdoor installations, it is recommended that the
regulator be installed so that the regulator vent faces
downward to avoid the potential for water or other foreign
matter entering the regulator and interfering with the
proper operation of the regulator.
Maximum Inlet Pressures
