Emerson 912N Series Pressure Regulators Data Sheet
2015-03-30
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Bulletin 71.1:912N
April 2010
D100124X012
The 912N Series direct-operated, spring-loaded regulators
are used in a variety of service and industrial applications.
These regulators have limited-capacity internal relief across
the diaphragm (see Figure 2) to help minimize overpressure.
Any outlet pressure above the start-to-discharge point of
the non-adjustable relief valve spring moves the diaphragm
off the relief valve seat, allowing excess pressure to bleed
out through the screened spring case vent. Inlet pressure
capabilities are the same for all regulators described in this
bulletin. However, outlet pressure ranges vary according to
construction (see Table 1).
Disk/lever assembly
is attached to a roller-style pivot for smoother action.
Handwheel construction is available for adjustment of
the pressure setting.
These regulators are suitable for a
variety of gaseous uids, including natural gas,
propane, and air. They are often used to supply
loading pressure to other units.
“Drip lip” vent
helps resist blockage during icing conditions. When
the regulator is installed with the vent pointing down,
any ice that builds up forms a protective sheath
that helps keep the opening unobstructed. The vent
screen helps prevent foreign material from entering
the spring case and clogging or otherwise hindering
regulator operation.
Diaphragm and disk/lever
assembly can be replaced without removing the
regulator from the pipeline.
Refer to Figure 2. When downstream demand decreases,
the pressure under the diaphragm increases. This pressure
overcomes the regulator setting (which is set by a spring).
Through the action of the pusher post assembly, the valve
disk moves closer to the orice and reduces gas ow. If
demand downstream increases, pressure under the diaphragm
decreases. Spring force pushes the pusher post assembly
P1024
Figure 1. 912N Series Regulator
Figure 2. 912N Series Operational Schematic
(Standard Spring Case Vent Shown)
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
M1021
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
Bulletin 71.1:912N
2
See Table 1
1/4 NPT
1/4 or 3/8 NPT
(1)
250 psig (17,2 bar)
(1)
See Table 1
(1)
20 psig (1,4 bar)
3 psid (0,21 bar differential) above outlet
pressure setting; provide external relief if start-to-
discharge point exceeds 3 psid (0,21 bar differential)
(see Table 1).
0.073 or 0.094-inch (1,9 or 2,4 mm)
4
See Tables 2 and 3
See Table 1
Adequate only for relieving minor
buildup situations such as those caused by chips
or dirt blocking the seat partly open; for major
malfunctions, external relief is required according
to the Overpressure Protection section
(1)
-20° to 160°F (-29° to 71°C)
Internal
1/8 NPT tapped
with removable screen
Constructions Without Handwheel: Over body outlet
Handwheel Constructions: Over body inlet
1.3 pounds (0,6 kg)
Zinc
Zinc
Plated carbon steel
Fluorocarbon (FKM) disk
with zinc lever, stainless steel lever pin and rod, and
plated carbon steel lever screws
Nitrile (NBR)/Nylon (PA)
Plated steel
Plated steel
Plated steel
spring wire, except stainless steel spring wire for
control spring 1L507937022
Stainless steel spring wire
Brass and zinc
Plastic
Brass, zinc, and steel
Composition
304 Stainless Steel
1. The pressure/temperature limits in this Bulletin or any applicable standard limitation should not be exceeded.
downward and the valve disk moves away from the orice.
912N Series regulators include an internal relief valve for
overpressure protection.
The 912N Series have outlet pressure ratings lower than their
inlet pressure ratings. Although the internal relief valve provides
very limited downstream overpressure protection, complete
downstream protection is needed if the actual inlet pressure
exceeds the outlet pressure rating.
Overpressuring any portion of these regulators may cause
leakage, damage to regulator parts, or personal injury due to
bursting of pressure-containing parts or explosion of accumulated
gas. Provide appropriate overpressure protection devices to
ensure that none of the limits found in the Specications section
or Table 1 will be exceeded.
Regulator operation with normal operating limits does not
preclude the possibility of damage from external sources or
from debris in the gas line. A regulator should be inspected for
damage after any overpressure condition.
912N Series regulators may be installed in any position;
however, the spring case vent should be pointed down on
outside installations. If gas escaping through the internal
relief valve could constitute a hazard, the spring case vent
should be piped to a location where escaping gas will not
be hazardous. If the vent will be piped to another location,
obstruction-free tubing should be used and a screened
vent should be installed on the end of the vent pipe. On
all installations, the vent or end of the vent pipe must
Bulletin 71.1:912N
3
Table 1. Outlet Pressure Range Data
)
3
5
25
5-inches w.c.
(12 mbar)
3 to 7-inches w.c.
(7 to 17 mbar) 1B784327222 1-inch w.c.
(2 mbar)
0.073
(1,9)
53
(1,42)
73
(1,96)
136
(3,65)
199
(5,33) - - - - - - - - - - - - - - - - - - - -
7-inches w.c.
(17 mbar)
5 to 10-inches w.c.
(12 to 25 mbar) 1B784427222 1-inch w.c.
(2 mbar) - - - - 72
(1,93)
122
(3,27)
171
(4,58)
187
(5,01)
222
(5,95)
222
(5,95)
232
(6,22) - - - -
11-inches w.c.
(27 mbar)
9.25 to
13-inches w.c.
(23 to 32 mbar)
1L507937022 1-inch w.c.
(2 mbar) - - - - 61
(1,64)
100
(2,68)
144
(3,86)
163
(4,37)
180
(4,82)
210
(5,63)
234
(6,27)
259
(6,94)
20-inches w.c.
(50 mbar)
12 to
24-inches w.c.
(30 to 60 mbar)
1B784527222 2-inches w.c.
(5 mbar) - - - - 58
(1,55)
95
(2,55)
137
(3,67)
163
(4,37)
189
(5,07)
243
(6,51)
303
(8,12)
315
(8,44)
1 psig
(69 mbar)
0.5 to 2.7 psig
(0,03 to 0,18 bar) 1B784627222
10%
0.094
(2,4)
- - - - 51
(1,37)
63
(1,69)
83
(2,22)
99
(2,65)
105
(2,81)
148
(3,97)
204
(5,47)
236
(6,33)
20% - - - - 70
(1,88)
100
(2,68)
140
(3,75)
177
(4,74)
201
(5,39)
302
(8,09)
377
(10,1)
440
(11,8)
2 psig
(138 mbar)
0.5 to 2.7 psig
(0,03 to 0,18 bar) 1B784627222
10% - - - - 62
(1,66)
91
(2,44)
120
(3,22)
155
(4,15)
178
(4,77)
249
(6,67)
304
(8,15)
358
(9,59)
20% - - - - 85
(2,28)
146
(3,91)
220
(5,90)
300
(8,04)
348
(9,33)
480
(12,9)
576
(15,4)
683
(18,3)
5 psig
(345 mbar)
2.7 to 5 psig
(0,18 to 0,34 bar) 1B784727222
10% - - - - 68
(1,82)
107
(2,87)
149
(3,99)
207
(5,55)
329
(8,82)
329
(8,82)
425
(11,4)
618
(16,6)
20% - - - - 94
(2,52)
169
(4,53)
283
(7,58)
386
(10,3)
486
(13,0)
711
(19,1)
860
(23,0)
1030
(27,6)
- - - - Not recommended for the given pressure range.
Table 2. Capacities for Type 912N Regulators without Handwheel (Body Size 1/4 x 3/8 NPT)
()
3
5
25
14-inches w.c.
(35 mbar)
8 to 24-inches w.c.
(20 to 60 mbar) 1B784527222 2-inches w.c.
(5 mbar) 0.094
(2,4)
70
(1,88)
96
(2,57)
121
(3,24)
129
(3,46)
143
(3,83)
156
(4,18)
156
(4,18)
190
(5,09)
212
(5,68)
3 psig
(207 mbar)
2.7 to 5 psig
(0,18 to 0,34 bar) 1B784727222 10% - - - - 92
(2,47)
153
(4,10)
261
(7,00)
354
(9,49)
459
(12,3)
587
(15,7)
716
(19,2)
731
(19,6)
- - - - Not recommended for the given pressure range.
Table 3. Capacities for Type 912N Regulators with Handwheel (Body Size 1/4 x 3/8 NPT)
912N Series
without handwheel
3 to 7-inches w.c.
5 to 10-inches w.c.
9.25 to 13-inches w.c.
12 to 24-inches w.c.
(7 to 17 mbar)
(12 to 25 mbar)
(23 to 32 mbar)
(30 to 60 mbar)
5 to 21-inches w.c.
8 to 30-inches w.c.
16 to 39-inches w.c.
17-inches w.c. to 3 psig
(12 to 52 mbar)
(20 to 75 mbar)
(40 to 97 mbar)
(42 mbar to 0,21 bar)
1B784327222
1B784427222
1L507937022
1B784527222
Red
Orange
Unpainted
Blue
1.09
1.37
1.78
1.34
(27,7)
(34,8)
(45,2)
(34,0)
0.035
0.037
0.038
0.047
(0,89)
(0,94)
(0,97)
(1,19)
0.5 to 2.7 psig
2.7 to 5 psig
(0,03 to 0,18 bar)
(0,18 to 0,34 bar)
0.70 to 6.80 psig
3.80 to 12.5 psig
(0,05 to 0,47 bar)
(0,26 to 0,86 bar)
1B784627222
1B784727222
Yellow
Green
1.19
1.31
(30,2)
(33,3)
0.075
0.080
(1,91)
(2,03)
912N Series
with handwheel
8 to 24-inches w.c. (20 to 60 mbar) 30.3 to 35.4-inches w.c. (75 to 88 mbar) 1B784527222 Blue 1.34 (34,0) 0.047 (1,19)
2.7 to 5 psig (0,18 to 0,34 bar) 5.4 to 6.7 psig (0,37 to 0,46 bar) 1B784727222 Green 1.31 (33,3) 0.080 (2,03)
1. Internal Relief Performance is only adequate for relieving minor buildup situations. External relief is required if start-to-discharge point exceeds 3 psid (0,21 bar differential).
Bulletin 71.1:912N
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business of Emerson Process Management.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or
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be protected from corrosive chemicals, debris, weather,
condensation, or anything else that might clog or enter the
spring case.
Regulator dimensions are shown in Figure 3.
Natural gas regulating capacities at selected inlet pressures
and outlet pressure settings are given in Tables 2 and 3.
Flows are in SCFH (60°F and 14.7 psia) of 0.6 specic
gravity natural gas. To determine the equivalent capacities
for other gases, multiply the table capacity by the following
appropriate conversion factor: 0.775 for air, 0.789 for
nitrogen, 0.625 for propane, or 0.548 for butane. For gases
of other specic gravities, multiply the given capacity by
0.775, and divide by the square root of the appropriate
specic gravity.
Then, if capacity is desired in normal cubic meters per
hour (Nm3/h) at 0°C and 1,01325 bar, multiply SCFH
by 0.0268.
When ordering, specify:
1. Composition and specic gravity of gas (including
chemical analysis if possible)
2. Range of temperatures
A88148-C
A2387
3.2
(5)
(13)
(51)
(91)
(13)
Figure 3. Dimensions
3. Flowing inlet pressures (maximum, minimum,
nominal), and pressure drops
4. Desired outlet pressure setting or range
5. Range of ow rates (minimum controlled,
maximum, normal)
6. Piping size(s)
Carefully review the information found in the Specications
section on page 2 and in each referenced table or gure.
Specify the desired choice whenever a selection is offered.
Always be sure to specify the regulator type number. For
information on UL Listed constructions, contact your local
Sales Ofce.
