failure of the regulator to lock-up. The allowable over
pressurization is the lowest of the maximum pressures permitted
by federal codes, state codes, Bulletin RDS-1498, or other
applicable standards. The method of providing over pressure
protection could be a relief valve, a monitor regulator, a shut off
device or any similar device.
Temperature Limits
The Model 441-S Regulator can be used for flowing temperatures
from -20°F to 150°F.
Buried Service
The Model 441-S Regulator is not recommended for buried service.
Condensed Parts List
For complete parts list and list prices please refer to RP 1350.
When ordering parts for a 441-S regulator, include pipe size,
model number, inner valve size, and serial number if possible.
Maximum Emergency Pressure
The maximum pressure the Model 441-S regulator inlet may be
subjected to under abnormal conditions without causing damage
to the regulator is 125 psi.
The Maximum pressure the regulator outlet may be subjected to
without causing damage to the internal part of the regulator is:
10" Diaphragm
set-point + 4 psi
12" Diaphragm
set-point + 3 psi
14" Diaphragm
set-point + 2 psi
16" Diaphragm
set-point + 1 psi
18" Diaphragm
set-point + 1 psi
20" Diaphragm
set-point + 1 psi
The set-point is defined as the outlet pressure a regulator is
adjusted to deliver.
If any of the above pressure limits are exceeded, the regulator
must be taken out of service and inspected. Damaged or
otherwise unsatisfactory parts must be repaired or replaced.
The maximum pressure that can be safely contained by the
diaphragm case is:
10" Diaphragm
15 psi
12" Diaphragm
10 psi
14" Diaphragm
10 psi
16" Diaphragm
5 psi
18" Diaphragm
5 psi
20" Diaphragm
5 psi
Safely contained means no leakage as well as no bursting. Before using
any of the above data, make sure this entire section is clearly understood.
Other Gases
The Model 441-S is mainly used on natural gas services; however,
this regulator will perform equally as well on other gases. When
using the Model 441-S Regulator on other gases, the regulator
capacities must be adjusted using the correction factors on page 5.
4
Installation and Maintenance Instructions
Model 441-S Regulator
To Change Spring
1
Remove seal cap
1
, back off adjusting screw
10
, remove
housing cover
5
, and remove spring
14
.
2
Insert the new spring. Be sure it nests correctly onto part
15
.
3
Complete as per steps 7, 8 and 9 under "To Assemble 441-S".
To Service Diaphragm
1
Remove seal cap
1
, back off adjusting screw
10
, remove
housing cover
5
, and remove spring
14
.
2
Remove bolts
42
and then carefully remove upper diaphragm
case
43
.
3
Turn diaphragm assembly counterclockwise until
24
unscrews
from
50e
or
50i
, then remove assembly and inspect
diaphragm.
4
If a new diaphragm
20
is required, remove nut
16
and
disassemble.
5
Reassemble diaphragm assembly (parts
16
,
17
,
18
,
19
,
20
,
21
,
22
,
23
,
24
).
6
Screw diaphragm assembly back into place (
24
screws into
50e
or
50i
until it bottoms) then
back off 1/2 to 1 full turn
this is important
.
7
Carefully reinstall upper diaphragm case
43
. Diaphragm must
not be pinched between upper and lower cases,
43
and
40
.
Tighten bolts
42
evenly.
8
Replace spring, etc., per steps 6 through 9 under
“To Assemble 441-S”.
To Assemble 441-S
1
Install orifice
28
through top opening.
2
Install valve assembly and orifice
29
per applicable steps 1
through 6 under “To Replace and Adjust Valves” (except that
50e
or
50i
does not yet screw into
24
).
3
Install centerpiece and lower diaphragm case,
36
and
40
.
4
Install diaphragm assembly and upper case
43
per steps
5 through 7 under “To Service Diaphragm”.
5
Replace bottom plate
33
. Match bottom end of
50h
into
31
and /or
32
, and then rotate bottom plate either way to first
matching bolt hole position.
6
Insert the spring. Be sure it nests correctly onto part
15
.
7
Insert top spring button
12
. Be sure it is nested correctly
on the spring.
8
Install housing cover
5
. Be sure ball
13
is in place and the
lower end of adjusting screw
10
goes in the hole in button
12
.
9
Set adjusting screw
10
for desired outlet pressure,
firmly tighten nut
11
and replace seal cap
1
.
Over Pressurization Protection
Protection must be provided for the downstream piping system
and the regulator's low pressure chambers to assure against the
potential over pressurization due to a regulator malfunction or a
