5
Installation and Maintenance Instructions
Model 461-57S Regulator
Maximum Emergency Pressures
The maximum pressure the regulator inlet may be subjected to under
normal conditions without causing damage to the regulator is:
Cast Iron Body, Screwed End
275 psi
Cast Iron, Flanged ANSI 125 lb
200 psi
Ductile Iron, Flanged ANSI 250 lb
630psi
Cast Steel, Flanged ANSI 300 lb
800 psi
Cast Steel, Flanged ANSI 600 lb
1100 psi
The maximum pressure the outlet may be subjected to without
causing damage to the internal parts of the regulator is:
All 461-57S
set-point + 25 psi
Set-point is defined as the outlet pressure a regulator is adjusted to
deliver. If any of the above pressure limits are exceeded, the regulator
must be taken out of service and inspected. Damaged or otherwise
unsatisfactory parts must be repaired or replaced. The maximum
pressure than can be safely contained by the diaphragm case is:
All 461-57S
175 psi
Safely contained means no leakage as well as no bursting.
Before using any of the above data, make sure this entire
section is clearly understood.
Other Gases
Model 461-57S Regulators are mainly used on natural gas. However,
they perform equally well on LP gas, nitrogen, dry CO
2
, air and others.
Other Gases
Correction Factor
Air (Specific Gravity 1.0)
0.77
Propane (Specific Gravity 1.53)
0.63
1350 BTU Propane-Air Mix (1.20)
0.71
Nitrogen (Specific Gravity 0.97)
0.79
Dry Carbon Dioxide (Specific Gravity 1.52)
0.63
For other noncorrosive gasses:
0.6
CORRECTION FACTOR=
Specific Gravity of the Gas
For use with gases not listed above, please contact your
Sensus representative or Industrial Distributor for recommendations.
Buried Service
The model 461-57S Regulator is
not
recommended for buried service.
Temperature Limits
The model 461-57S Regulator can be used for flowing temperatures
from -20°F to 150°F.
Overpressurization Protection
Protect the downstream piping system and the regulator's low
pressure chambers against overpressurization due to possible
regulator malfunction or failure to achieve complete lockup.
The allowable outlet pressure is the lowest of the maximum
pressures permitted by federal codes, state codes, Sensus Bulletin
RDS-1498, or other applicable standards. The method of
protection can be a relief valve, monitor regulator, shutoff device,
or similar mechanism.
Condensed Parts List
Illustration Part
Number
Description
Number
3
Hex Steel Nut 5/8"-11
921407
4
Tetraseal (or O-Ring) 1-3/4" x 2"
904092
7b
Thrust Bearing-Stainless ball
930510
3/8" Dia.
8
Anti-Friction Bushing Assy.
091-16-373-00
Spring – Yellow 3 to 6 psi
091-00-021-05
Spring – Gray 5 to 9 psi
091-00-021-04
Spring – Blue 7-1/2 to 15 psi
091-00-021-03
9
Spring – Red 12-1/2 to 30 psi
091-00-021-02
Spring – Brown 25 to 55 psi
091-00-021-01
Spring – Black 50 to 75 psi
091-00-021-00
Spring – Brown plus White
70 to 100 psi Brown outer spring
091-00-021-01
White inner spring
091-00-021-08
11a
Hex, Steel Nut 5/8" – 18
905993
11c
Diaphragm Plate – upper
091-00-010-00
11d
Diaphragm – 5" Roll-Out
091-00-350-00
11e
Diaphragm Plate – lower
091-00-022-00
11f
O-Ring, 5/8" x 3/4"
902922
11g
Split Lockwasher 5/8"
932531
11h
Diaphragm Stem
091-00-058-00
1" Double Seat Valve Assembly
091-16-515-01
brass trim, Buna-N
1" Double Seat Valve Assembly
091-16-515-03
stainless trim, Buna-N
1" Double Seat Valve Assembly
091-16-515-11
brass trim, Red Polyurethane
1" Double Seat Valve Assembly
091-16-515-13
stainless trim, Red Polyurethane
1" Double Seat Valve Assembly
091-16-515-65
brass trim, Tan Polyurethane,V-port
11/16" Double Seat Valve
091-16-515-00
12
Assembly brass trim, Buna-N
11/16" Double Seat Valve
091-16-515-02
Assembly stainless trim, Buna-N
11/16" Double Seat Valve Assembly
091-16-515-10
brass trim, Red Polyurethane
11/16" Double Seat Valve Assembly
091-16-515-12
stainless trim, Red Polyurethane
1" Single Seat Valve Assembly
091-16-515-51
stainless trim, Red Polyurethane
11/16" Single Seat Valve Assembly
091-16-515-50
stainless trim, Red Polyurethane
12a
O-Ring, 3/8" x 1/2"
934007
Male Valve Stem, 5-1/16" Lg. brass
091-16-116-02
for 1" & 11/16" double seat assembly
Male Valve Stem, 5-1/16" Lg. stainless
091-16-116-00
12b
for 1" & 11/16" double seat assembly
Valve Stem – stainless for
091-00-016-07
1" single seat assembly
Items in bold face type denote minimum recommended spare parts.
