Side Inspection Plate
39
38
26
27
29
26
27
28
25
24
23
22a
22
20
19
17
16
45
13
12
11
10
32
33
34
35
1
1a
4
6
5
7
8
14
42
41
36a
40a
40
36
60
40
36
34
35
37a
37
a
b
c
d
e
a
b
d
c
g
h
50
See General
Note 6, p.3
5
To Assemble 441-57S
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
or
40a
.
4
.
Install diaphragm assembly and case per steps 5 through 7
under “To Service Diaphragm”.
5
.
Replace bottom plate
33
. Match bottom end of
50h
into
31
and/or
32
, then rotate bottom plate either way to
the first matching bolt hole position.
6
.
Inset the spring. Be sure it nests correctly onto part
19
and travel indicator bracket
45k
is in place. Also, make
a visual inspection of diaphragm
20
before inserting the
spring to be sure the roll-out is uniform and in place
(use a flashlight if necessary).
7
.
Insert top spring button
12
. Be sure it is nested correctly
on the spring. Also, make sure that ball
13
is in place.
8
.
Install housing cover
5
. Be sure the lower end of adjusting
screw
10
fits into 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 failure of the regulator to lock-up. The allowable over
pressurization is the lowest of the maximum pressures permitted
by federal codes, state codes, Sensus 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 441-57S Regulator can be used for
flowing temperatures from -20°F to 150°F.
Buried Service
The 441-57S Regulators ARE NOT recommended
for buried service.
Model 441-57S
General Assembly 2" and 3" Models
Installation and Maintenance Instructions
Model 441-57S Regulator
