Emerson 912N Series Pressure Regulators Data Sheet

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Bulletin 71.1:912N
April 2010

912N Series Pressure Regulators
Introduction
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).

Features
  •  Accurate and Sensitive Control—Disk/lever assembly
  is attached to a roller-style pivot for smoother action.
  Handwheel construction is available for adjustment of
  the pressure setting.
  •  Versatility—These regulators are suitable for a
     variety of gaseous fluids, including natural gas,
  propane, and air. They are often used to supply
  loading pressure to other units.

P1024

Figure 1. 912N Series Regulator
regulator
spring

  •  Weather and Insect Protection—“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.

Relief Valve
Spring

pusher post
assembly

Relief Valve
Seat
vent screen
diaphragm

  •  Easy Maintenance—Diaphragm and disk/lever
  assembly can be replaced without removing the
  regulator from the pipeline.

Principle of Operation

M1021

Valve disk

disk/lever
assembly

D100124X012

Body/Lower
Refer to Figure 2. When downstream demand decreases, INLET PRESSURE
Casing
OUTLET PRESSURE
the pressure under the diaphragm increases. This pressureATMOSPHERIC PRESSURE
Inlet pressure
INLET
PRESSURE
overcomes the regulator setting (which is set by a spring).
OUTLET pressure
OUTLET
PRESSURE
Through the action of the pusher post assembly, the valve
ATMOSPHERIC
pressure
ATMOSPHERIC
PRESSURE
disk moves closer to the orifice and reduces gas flow.  If
demand downstream increases, pressure under the diaphragm
Figure 2. 912N Series Operational Schematic
decreases. Spring force pushes the pusher post assembly
(Standard Spring Case Vent Shown)

www.fisherregulators.com

Bulletin 71.1:912N
Specifications
Available Constructions
	
See Table 1

Pressure Registration
	
Internal

Body Sizes and End Connection Styles
	
Inlet: 1/4 NPT
	
Outlet: 1/4 or 3/8 NPT
Maximum Allowable Inlet Pressure(1)
	
250 psig (17,2 bar)

Spring Case Vent
	
Standard Construction: 1/8 NPT tapped
 
with removable screen
	
Standard Location
	
Constructions Without Handwheel: Over body outlet
	
Handwheel Constructions: Over body inlet

Outlet Pressure Ranges(1)
	
See Table 1

Approximate Weight
	
1.3 pounds (0,6 kg)

Maximum Allowable Outlet Pressure(1)
	
Emergency Outlet Pressure: 20 psig (1,4 bar)
	
Recommended Outlet Pressure to Avoid Internal 		
	
Part Damage: 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).

Construction Materials
	Body/Lower Casing: Zinc
	
Spring Case: Zinc
	
Spring Case Bolting: Plated carbon steel
	Disk/Lever Assembly: Fluorocarbon (FKM) disk 	
with zinc lever, stainless steel lever pin and rod, and 	
plated carbon steel lever screws
	Diaphragm: Nitrile (NBR)/Nylon (PA)
	Diaphragm Plate: Plated steel
	
Spring Seat: Plated steel
	
Control and Relief Valve Spring: Plated steel
	
spring wire, except stainless steel spring wire for
	
control spring 1L507937022
	
Closing Spring (Optional Handwheel
	
Constructions Only): Stainless steel spring wire
	
Relief Valve Assembly: Brass and zinc
	
Closing Cap and Adjusting Screw
	
(Constructions Without Handwheel): Plastic
	
Closing Cap and Adjusting Screw
	
Assembly (Optional Handwheel Constructions
	
Only): Brass, zinc, and steel
	
Closing Cap Gasket: Composition
	
Vent Screen: 304 Stainless Steel	

Body Port Diameter
	
0.073 or 0.094-inch (1,9 or 2,4 mm)
Wide-Open Cg for Relief Sizing
	
4
Typical Regulating Capacities
	
See Tables 2 and 3
Internal Relief Performance
	
Approximate Internal Relief Valve
	
Start-to-Discharge Point: See Table 1
	
Capacity: 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
Temperature Capabilities(1)
	 -20° to 160°F (-29° to 71°C)

  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 orifice.
912N Series regulators include an internal relief valve for
overpressure protection.

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 Specifications section
or Table 1 will be exceeded.

2

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.

Installation
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
Table 1. Outlet Pressure Range Data
available
CONSTRUCTION

3 to 7-inches w.c.
5 to 10-inches w.c.
9.25 to 13-inches w.c.
912N Series
without handwheel 12 to 24-inches w.c.
0.5 to 2.7 psig
2.7 to 5 psig
8 to 24-inches w.c.
912N Series
with handwheel
2.7 to 5 psig

control spring selection

approximate point above outlet
pressure setting at which
internal relief starts
to discharge

outlet pressure range

(7 to 17 mbar)
5 to 21-inches w.c.
(12 to 25 mbar)
8 to 30-inches w.c.
(23 to 32 mbar)
16 to 39-inches w.c.
(30 to 60 mbar)
17-inches w.c. to 3 psig
(0,03 to 0,18 bar)
0.70 to 6.80 psig
(0,18 to 0,34 bar)
3.80 to 12.5 psig
(20 to 60 mbar) 30.3 to 35.4-inches w.c.
(0,18 to 0,34 bar)
5.4 to 6.7 psig

Spring Free
Length,
Inch (mm)
(12 to 52 mbar)
1B784327222
Red
1.09 (27,7)
(20 to 75 mbar)
1B784427222 Orange 1.37 (34,8)
(40 to 97 mbar)
1L507937022 Unpainted 1.78 (45,2)
(42 mbar to 0,21 bar) 1B784527222
Blue
1.34 (34,0)
(0,05 to 0,47 bar)
1B784627222
Yellow
1.19 (30,2)
(0,26 to 0,86 bar)
1B784727222
Green
1.31 (33,3)
(75 to 88 mbar)
1B784527222
Blue
1.34 (34,0)
(0,37 to 0,46 bar)
1B784727222
Green
1.31 (33,3)
Part Number

Color
Code

Spring Wire
Diameter,
Inch (mm)
0.035 (0,89)
0.037 (0,94)
0.038 (0,97)
0.047 (1,19)
0.075 (1,91)
0.080 (2,03)
0.047 (1,19)
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).

Table 2. Capacities for Type 912N Regulators without Handwheel (Body Size 1/4 x 3/8 NPT)

Outlet
Pressure
Setting

Outlet
pressure
Range

Spring
PART
Number

Offset

5-inches w.c.
(12 mbar)

3 to 7-inches w.c.
(7 to 17 mbar)

1B784327222

7-inches w.c.
(17 mbar)

5 to 10-inches w.c.
(12 to 25 mbar)

11-inches w.c.
(27 mbar)

ORIFICE
SIZE,
INCH (mm)

Capacity in Scfh (Nm3/h) of 0.6 specific gravity
natural gas
Inlet Pressure, Psig (bar)
5
(0,34)

10
(0,69)

25
(1,7)

50
(3,4)

75
(5,2)

100
(6,9)

150
(10,3)

200
(13,8)

250
(17,2)

1-inch w.c.
(2 mbar)

53
(1,42)

73
(1,96)

136
(3,65)

199
(5,33)

----

----

----

----

----

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)

----

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)

10%

----

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)

----

62
(1,66)

91
(2,44)

120
(3,22)

155
(4,15)

178
(4,77)

249
(6,67)

304
(8,15)

358
(9,59)

----

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)

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)

0.073
(1,9)

1B784627222

10%

0.094
(2,4)

1B784627222
20%

1B784727222

  - - - - Not recommended for the given pressure range.

Table 3. Capacities for Type 912N Regulators with Handwheel (Body Size 1/4 x 3/8 NPT)

Outlet
Pressure
Setting

Outlet
pressure
Range

Spring
PART
Number

Offset

14-inches w.c. 8 to 24-inches w.c.
2-inches w.c.
1B784527222
(35 mbar)
(20 to 60 mbar)
(5 mbar)
3 psig
(207 mbar)

2.7 to 5 psig
1B784727222
(0,18 to 0,34 bar)

10%

ORIFICE
SIZE,
INCH
(mm)

0.094
(2,4)

Capacity in Scfh (Nm3/h) of 0.6 specific gravity natural gas
Inlet Pressure, Psig (bar)
5
(0,34)

10
(0,69)

25
(1,7)

50
(3,4)

75
(5,2)

100
(6,9)

150
(10,3)

200
(13,8)

250
(17,2)

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)

----

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.

3

Bulletin 71.1:912N
be protected from corrosive chemicals, debris, weather,
condensation, or anything else that might clog or enter the
spring case.

3.2
(81)

0.2
(5)

Regulator dimensions are shown in Figure 3.

Capacity Information

2.8
(71)

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 specific
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 specific gravities, multiply the given capacity by
0.775, and divide by the square root of the appropriate
specific gravity.

0.5
(13)

0.5
(13)
2.0
(51)
A88148-C
A2387

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.

Ordering Information

Vent
Connection:
tapped
with
removable
screen
(standard)

INCHES
(mm)

3.6
(91)

Figure 3. Dimensions

  3.  Flowing inlet pressures (maximum, minimum,
 
nominal), and pressure drops
  4.  Desired outlet pressure setting or range
  5.  Range of flow rates (minimum controlled,
 
maximum, normal)
  6.  Piping size(s)

When ordering, specify:

Construction

Application
  1.  Composition and specific gravity of gas (including
 
chemical analysis if possible)
  2.  Range of temperatures

Carefully review the information found in the Specifications
section on page 2 and in each referenced table or figure.
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 Office.

Industrial Regulators

Natural Gas Technologies

TESCOM

Emerson Process Management
Regulator Technologies, Inc.

Emerson Process Management
Regulator Technologies, Inc.

Emerson Process Management
Tescom Corporation

USA - Headquarters
McKinney, Texas 75069-1872 USA
Tel: 1-800-558-5853
Outside U.S. 1-972-548-3574

USA - Headquarters
McKinney, Texas 75069-1872 USA
Tel: 1-800-558-5853
Outside U.S. 1-972-548-3574

USA - Headquarters
Elk River, Minnesota 55330-2445 USA
Tel: 1-763-241-3238

Asia-Pacific
Shanghai, China 201206
Tel: +86 21 2892 9000

Asia-Pacific
Singapore, Singapore 128461
Tel: +65 6777 8211

Europe
Bologna, Italy 40013
Tel: +39 051 4190611

Europe
Bologna, Italy 40013
Tel: +39 051 4190611
Gallardon, France 28320
Tel: +33 (0)2 37 33 47 00

Middle East and Africa
Dubai, United Arab Emirates
Tel: +971 4811 8100

Europe
Selmsdorf, Germany 23923
Tel: +49 (0) 38823 31 0

For further information visit www.fisherregulators.com
The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners. Fisher is a mark owned by Fisher Controls, Inc., a
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
guarantees, express or implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specifications of such
products at any time without notice.
Emerson Process Management does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any Emerson
Process Management product remains solely with the purchaser.

©Emerson Process Management Regulator Technologies, Inc., 1978, 2010; All Rights Reserved



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