Sensus 122 Series, Installation And Maintenance Instructions Manual

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GIM1329-070
GIM1329-065
8
Model 122 Regulators Installation and Maintenance Instructions
To Service Seal Diaphragm (12b)
1. Disassemble diaphragm assembly per section “To Service
Main Diaphragm ( 11d )”.
2. Remove bolts 25 and lower diaphragm case 24 .
3. Remove seal washer 12e , spacer 12a and gasket 26 , and
remove seal diaphragm 12b .
4.
During assembly use screwdriver in slot in top end of stem
12d
or
12t
while tightening nut
11a
. Diaphragms must not be
twisted or strained during regulator reassembly.
To Convert from Internal to External Control
1. Remove seal diaphragm 12b per section “To Service Seal
Diaphragm ( 12b )”.
On 1½" Model 122 remove bushing
41
(See Fig. 2) and 2" or
2½" Model 122 remove control tube
40
.
2. Reinstall seal diaphragm 12b and gasket 26 so they cover
and block hole for 40 and 41 , and reassemble. On Back
Pressure Regulators and Relief Valves, install washers 12c
and 12e , spacer 12a , seal diaphragm 12b and two 11f grip
washers in place of spacer 12s , and reassemble. Emery
surface of grip washers 11f must face against both sides of
seal diaphragm 12b . Seal diaphragm 12b and gasket 26 must
block the hold for 40 or 41 . However, 40 and 41 are not used
in the Back Pressure Regulators and Relief Valve.
3. Remove plug 24a and install external control line.
To Convert From External To Internal Control
1. Remove seal diaphragm 12b per section “To Service Seal
Diaphragm ( 12b ).”
2. 1½" Model 122 requires a new body with control tube 43
in place as shown in figure 2. Install bushing 41 and O-ring 42
(Figure 2). On 2" and 2½" Model 122 install control tube 40
and O-ring 42 . Control tube 40 must be centered and aligned
with slots faced downstream as shown.
1½", 2" and 2½" Model 122-12
GIM1329-065
(External Control)
BACk PRESSURE REGULATOR RELIEF VALVE
GIM1329-070
(Internal Control)
BACk PRESSURE REGULATOR RELIEF VALVE
3. Rotate seal diaphragm 12b and gasket 34 to match 40 or 41
and reassemble.
On Back Pressure regulators and Relief Valves, install spacer
12s in place of spacer 12a , washer 12c and seal diaphragm
12b , and reassemble. Gasket 26 must cover opening for 40
or
41
.
4. Install plug 24a .
Condensed Parts List 1½", 2", and 2½" Model 122
Note: For ILL. No's 1, 2, 3, 6, 11a, 11b, 12e, 13, 14a, 14b, 16a, 16b, 17a, 21a,
24a, 41 and 42. See Pages 6–7 CONDENSED PARTS LIST.
Illustration
Number Description
Part
Number
9 Spring, See Tables, Pages 3–4
11a Hex S. Nut 908158
11b Diaphragm Plate
121-10-022-50
11c Diaphragm Pan
121-16-017-50
11d Diaphragm, Buna-N
121-16-150-50
11f Grip Washer
121-10-178-50
12a Spacer
121-42-079-01
12b Seal Diaphragm, Buna-N
121-42-064-00
12c Clamp Washer
121-42-010-00
12d Stem, Std.
121-42-016-00
12d Stem, Stainless
121-42-016-02
12f Seal Washer
107-62-358-01
12e Seal Washer (Emery Cloth)
121-10-179-50
12s Spacer, Stainless
121-42-079-03
1
2
3
9
45
21
22
23
24
25
26
27
21a
11
f
b
a
c
d
12
f
e
b
a
c
t
11f
16a 13 15 14b 19 38 18 16b 19a 37
14a
32
1
2
3
9
45
21
22
23
24
25
12
e
f
s
t
16a 13 15 14b 19 38 18 16b 19b 37 32
11
f
b
a
c
d