Sensus 441-57S - To Assemble 441-57 S; Over Pressurization Protection; Temperature Limits; Buried Service

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