Sensus 121 Series, Installation And Maintenance Instructions Manual

Page: 17 / 24

17
Installation and Maintenance
Model 121 Regulators
Condensed Parts List 3" and 4"
Illustration Description Part
Number Number
3" and 4" Model 121
1
Seal Cap for 121-16 138-02-005-01
Seal Cap for 121-12 143-16-005-00
2 Seal Cap Gasket for 121-16 120-08-066-00
Tetraseal for 121-12, 2-1/4" x 2-3/8" 905241
3
Adjustment Spring Button for
143-16-009-00
for 121-12
8 Thrust Washer 141-10-160-01
9 Spring see table “Spring Ranges”
121-16 Diaphragm Assembly
121-62-550-50
11a Elastic Stop Nut 52-NTE-066 903955
11b Bottom Spring Button 121-62-022-50
11
11c Diaphragm Pan 121-62-017-50
11d Diaphragm, Buna-N 121-62-150-50
11d Diaphragm, Viton 121-62-150-52
11f Seal Washer 121-10-178-50
11h Diaphragm Stud, stainless steel 121-16-058-52
121-12 Diaphragm Assembly
(3-1/2" w.c. to 2 psi outlet pressure) 121-16-550-51
11a Elastic Stop nut 29-NE-066
903955
11b Bottom Spring Button 121-10-022-50
11 11c Diaphragm Pan 121-16-017-50
11d Molded Diaphragm, Buna-N 121-16-150-53
11d Diaphragm, Viton 121-16-150-55
11f Seal Washer 121-10 178-50
11h Diaphragm Stud, stainless steel 121-16-058-52
13
O-Ring, Buna-N, 3/8" x 1/2" 934007
O-Ring, Viton, 3/8" x 1/2" 902418
14 Wave Washer 905481
16a Retaining Ring 904448
16b
Valve Holder, split (pair required),
121-22-130-51
stainless steel
17
O-Ring, Buna-N, 5/8" x 3/4" 902922
O-Ring, Viton, 5/8" x 3/4" 902698
26 Tetraseal (or O-Ring) 4-3/8" x 4-5/8" 904085
28 Tetraseal (or O-Ring) 2-3/4" x 3" 904079
Repair Kits, consisting of Buna-N
Main and Seal Diaphragm, Buna-N
Molded Valve plus Wave Washer
and Retaining Ring, Buna-N
46 O-Rings, Tetraseals and Gaskets
3" 121-16
121-60-598-50
3" 121-12 121-20-598-50
4" 121-16 121-62-598-50
4" 121-12 121-22-598-50
For Back Pressure Models
Item 14 above,
14
Wave Washer – substitute
Poly-U Disk
121-22-102-52
Retainer 121-22-103-50
17
Condensed Parts List 3" and 4"
Illustration Description Part
Number Number
3" Model 121 only
12a Piston 121-20-053-50
12b Seal Diaphragm, Buna-N 121-20-364-50
12 12b Seal Diaphragm, Viton 121-20-364-51
12c Plate 121-20-010-50
12d Stem, stainless steel 121-20-016-51
15
Molded Valve, Buna-N (45-50 Duro) 121-20-311-50
Molded Valve, Viton-A (65-75 Duro) 121-20-311-51
15a
Valve Wing 121-20-018-50
Valve Wing, stainless steel 121-20-018-51
18 Tetraseal (or O-Ring) 3-3/4" x 4" 904200
19
Orifice, 3-1/4" dia., steel 121-20-023-50
Orifice, 3-1/4" dia., stainless steel 121-20-023-51
19a Retaining Ring, stainless 904660
32 Tetraseal (or O-Ring) 5" x 5-1/4" 934328
33 Seal Diaphragm Ring 121-20-008-50
34 Gasket 121-20-104-50
45
Travel Indicator
091-00-365-00
(specify scale 091-00-008-02)
For Back Pressure Models
12 Item 12d above, Stem - substitute
Stem, Back Pressure
121-20-016-53
47
Add item 47
Valve, Seal Diaphragm and
121-20-511-50
Stem Assembly
4" Model 121 only
12a Piston 121-22-053-50
12b Seal Diaphragm, Buna-N 121-22-264-50
12
12b Seal Diaphragm, Viton 121-22-364-51
12c Plate 121-22-010-50
12d Stem, steel 121-22-016-53
12d Stem, stainless steel 121-22-016-51
15 Molded Valve, Buna-N (45-50 Duro) 121-22-311-50
Molded Valve, Viton-A (65-75 Duro) 121-22-311-51
15a Valve Spacer 121-22-038-50
18 Tetraseal (or O-Ring) 4-3/4" x 5" 950625
19 Orifice, 4-7/32" dia., steel 121-22-023-50
19a Retaining Ring 904229
20 Orifice, 4-7/32" dia., Stainless steel 121-22-023-52
Retaining Ring, stainless 121-22-130-52
20a Pliers for Retaining Ring 19a
OB5
Truarc 0600
32 O-Ring 6-1/4" x 6-1/2" 934337
33 Seal Diaphragm Ring 121-22-008-50
34 Gasket 121-22-104-50
45
Travel indicator
091-00-365-00
(specify scale 091-00-008-002)
For Back Pressure Models
12
Item 12d above, Stem - substitute
121-20-016-53
Stem, Back Pressure
Add item 47
47 Valve, Seal Diaphragm and Stem 121-20-511-50
Assembly