2
T
he Model 441-57S Regulator is an excellent general purpose gas pressure regulator for larger loads.
Use it for natural gas, air, dry CO
2
, propane, butane, and other gases.
Regulator
Maximum
Body Type
Body Materials
Inlet Pressure
2" Screwed
Cast Iron
250 psi
Flanged ANSI 125
Cast Iron
175 psi*
Flanged ANSI 250
Ductile Iron
575 psi*
Flanged ANSI 300
Cast Steel
720 psi *
Flanged ANSI 600
Cast Steel
1000 psi*
*Carefully note the following exceptions to the above, based on valve size:
Maximum Inlet Pressures
Maximum
Body Size
Valve
Inlet Pressure
6"
4-1/4"
150 psi
6"
3" reduced
300 psi
4"
3"
6"
2-1/8" reduced
4"
2-1/8" reduced
500 psi
3"
2-1/8"
Valve material selection is limited by inlet pressure and differential.
Valve
Maximum
Maximum
Material
Inlet Pressure
Pressure Differential
Buna-N
575 psi
250 psi
Poly-U Red
720 psi
400 psi
Poly-U Tan
1200 psi
600 psi
Installation and Start-Up
1.
Thoroughly purge inlet piping to remove dirt and debris
that could damage the regulator or impair its operation.
If this cannot be done, a filter or strainer should be installed
ahead of the regulator (see Catalog RDS 1498, Regulator
Pressure Ratings). Make certain that inside of regulator and
piping are free of dirt, foreign matter, and other debris.
2
.
Install the regulator. Make certain flow through the regulator
is in the correct direction. High pressure connects to
the inlet side. Be sure that shipping screens or covers,
if used, are removed.
On flanges, tighten bolts evenly. On screwed connections,
apply pipe dope to male threads only.
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.
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 outlet of the vent piping must allow for the free and
unobstructed passage of air and gas and must be protected
against the potentials listed in the instructions.
4.
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 proper
operation of the regulator.
5.
Install the control line. Run it from the Union shown at
60
on the regulator to the control connection in the outlet piping.
The control line should be no less than 1/2” in size. It should
be sturdy with adequate protection against breakage
(regulators go wide open if the control line is broken). Pitch it
to drain away from the regulator, free of moisture pockets.
The regulator will work to deliver the pressure (for which it
is adjusted) at that point in the piping where the control
connection is located.
In general, the control connection should be at least eight
pipe diameters downstream from the regulator and should
be in as straight a run of pipe as possible where turbulence
is at a minimum. Keep clear of elbows, valves, and other
causes of excessive turbulence.
The control connection should be clean and smooth inside
the pipe to minimize turbulence. It should be free of rough
edges, welding “icicles”, etc. It should be located on the top
or side of the pipe, not on the bottom. Where outlet piping
increases in size near the regulator, it is generally preferable
to locate the connection to the larger size piping.
The Union
60
contains a small orifice (approximately
1/16” diameter). This orifice should not be removed.
Also, make certain it is open and free of foreign material.
6
Check all connections for leaks.
Installation and Maintenance Instructions
Model 441-57S Regulator
