7
Condensed Parts List
All Models
Illustration Part
Number Description Number
28 Seal Cap Gasket 091-16-066-00
Valve Stem Guide, stainless,
30
11/16” single seat assembly 091-16-012-52
Valve Stem Guide, stainless,
1” single seat assembly 091-16-012-53
32
Tetraseal (or O-Ring),
904086
1-1/2” x 1-3/4”
33
Ductile Iron Inspection Plate,Side 091-16-072-04
Steel Inspection Plate, Side 091-16-072-01
45 Travel Indicator Assembly 091-00-365-61
Model 461-12S
All Models
Illustration Part
Number Description Number
Diaphragm Assembly,
11 3-1/2” w.c. to 2 psi 121-16-550-51
outlet pressure complete
11a Elastic Stop Nut 29-NE-066 903955
11b Bottom Spring Button 121-10-022-53
11c Diaphragm Pan 121-16-017-50
11d*
Molded Diaphragm,
121-16-150-53-001
Buna-N
11f Emery Cloth Washer 121-10-178-50
11h
Diaphragm Stud,
121-16-058-52
stainless steel
*Minimum Recommended Spare Parts
Model 461-8S
All Models
Illustration Part
Number Description Number
11
Diaphragm assembly, 2 psi to
121-10-550-55
10 psi outlet pressure complete
11a Elastic Stop Nut 29-NE-066 903955
11b Bottom Spring Button 121-10-022-50
11c Diaphragm Pan 121-10-017-50
11d* Diaphragm, Buna-N 121-10-150-50
11e Upper Plate 121-10-022-52
11f Emery Cloth Washer 121-10-178-50
11g Lower Plate 121-10-079-52
11h Diaphragm Stud, stainless steel 091-16-058-02
Model 461-S
All Models
Illustration Part
Number Description Number
11
Diaphragm Assembly, 12” 091-16-550-01
Diaphragm Assembly, 8-1/2” 091-86-550-02
11a Hex Flexloc Nut 3/8” – 16” 900123
11b Bottom Spring Button 091-16-009-50
11c
Upper Diaphragm Plate, 12” 091-16-060-00
Upper Diaphragm Plate, 8-1/2” 091-86-010-00
11d*
Diaphragm,12” 091-16-150-00
Diaphragm, 8-1/2” 091-86-150-00
11e
Lower Diaphragm Plate, 12” 091-16-060-01
Lower Diaphragm Plate, 8-1/2” 091-86-010-00
11f Seal Washer 014-76-179-03
11g Stat-O-Seal, 3/8” 904985
11h Diaphragm Stud, stainless steel 091-16-058-02
*Minimum Recommended Spare Parts
Maximum Emergency Pressures
For complete Maximum Emergency Pressure information for
Model 461 Regulators, refer to bulletin RDS-1498, Regulator
Pressure Ratings. If the maximum outlet pressure is exceeded,
the regulator must be removed from service and carefully
inspected. Damaged or otherwise unsatisfactory parts must be
replaced before returning the regulator to service.
Monitoring
The 461-S, 461-8S, or 461-12S make an excellent monitor;
a standby regulator installed in series which assumes control if
a failure in the operating regulator permits the outlet pressure to
exceed the set-point.
The fast rate of response enables it to take over quickly where
necessary, and its outstanding performance means that it will
provide excellent standby regulation.
It can be located in either the upstream or the downstream
position.
When a 461 is used to monitor a regulator with an identical inner
valve (another 461, a Model 1100 etc.) the total maximum
capacity through both can be figured at 70% of the capacity
of one of them alone. This applies with the monitor located
either upstream or downstream.
Other Gases
The regulator models 461-S, 461-12S, and 461-8S are mainly used
on natural gas services; however, these regulators will
perform equally well on other gases. When using the regulators
on other gases, the regulator capacities must be adjusted using
the following correction factors.
Type of Gas Correction Factor
Air (specific gravity 1.0) 0.77
Propane (specific gravity 1.53) 0.63
1350 BTU Propane-Air mixture
0.71
(specific gravity 1.20)
Nitrogen (specific gravity 0.97) 0.79
Dry CO
2
(specific gravity 1.52) 0.63
Correction Factor =
For use with gases not listed above, please contact your
Sensus representative or Sensus Distributor for
recommendations.
0.60
Specific gravity of the gas
Installation and Maintenance Instructions
Model 461-S, 461-8S, and 461-12S Regulator
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