Emerson Fisher N100 Series User manual

N100, N100A, N110, and N120 Series
D450001T012
Instruction Manual
MCK-1008
March 2009
www.emersonprocess.com/regulators/lp
N100, N100A, N110, and N120 Series Differential
Bypass and Backpressure Valves
!
WARNING
Failure to follow these instructions or
to properly install and maintain this
equipment could result in an explosion,
and/or re causing property damage and
personal injury or death.
Fisher®equipment must be installed,
operated, and maintained in accordance
with federal, state, and local codes
and manufacturer’s instructions. The
installation in most states must also
comply with NFPA. 58 or ANSI
standard K61.1.
Only personnel trained in the proper
procedures, codes, standards, and
regulations of the LP-Gas or Anhydrous
Ammonia industries should install and
service this equipment.
Introduction
Scope of the Manual
This manual covers instructions for the N100, N100A,
N110, and N120 Series Differential Bypass and
Backpressure Valves, shown in Figure 1.
Description
These valves are designed for use with propane,
butane, and anhydrous ammonia at ambient
temperatures. The valves can be used on other
compressed gases, but the user should check with
the factory to make sure the valve is suitable for the
particular service.
A 1/4 NPT tapped and plugged boss on the inlet side
of the body can be used to install a hydrostatic relief
valve or a pressure gauge.
The Types N100, N100A, and N110 have internal sensing
orices so that no external sensing line is required.
N100 and N100A Series Bypass Valves
These valves are designed for bypass applications
on NPS 2 through 4 (DN 50 through 100) size pumps.
The throttling action of the valves allows only surplus
pump discharge to be returned to the tank.
N110 Series Bypass Valve
These valves are designed for bypass applications
on smaller pumps (5 to 40 GPM (18,9 to 151 l/min)
propane) used on stationary tanks or delivery trucks.
N120 Series Backpressure Valve
These valves are intended for use with smaller pumps
on cylinder lling applications. When installed after
the liquid meter, the Type N120 holds a differential
backpressure on the meter to prevent vapor from forming
within the meter. An external sensing line is required.
Figure 1. Bypass and Backpressure Valves
TYPE N100
TYPE N110 TYPE N120

N100, N100A, N110, and N120 Series
2
Installation
Make sure the ow is in the same
direction as the arrow cast into the
valve body.
Refer to Figures 2 and 3.
Piping to the valve should be kept as short as possible
with a minimum number of pipe ttings. Remove any
pipe scale or foreign material from the piping before
installing the valves.
Specications
Type Numbers, Differential Pressure
Settings and Ranges
See Tables 1, 2, and 3
CAUTION
Maximum Working Pressure
400 psig (27,6 bar)
Temperature Capabilities
-20° to 140°F (-29° to 60°C)
PUMP SIZE TYPE NUMBER BODY SIZE, NPS DIFFERENTIAL PRESSURE
SETTING, PSID (bar d)
DIFFERENTIAL PRESSURE
RANGE, PSID (bar d)
NPS 2 N100A-08-1 1 FNPT 50 (3,4) 25 to 75 (1,7 to 5,2)
N100A-08-2 115 (7,9) 50 to 150 (3,4 to 10,3)
NPS 2 to 3
N100A-10-1 1-1/4 FNPT 50 (3,4) 25 to 75 (1,7 to 5,2)
N100A-10-2 115 (7,9) 50 to 150 (3,4 to 10,3)
N100A-12-1 1-1/2 FNPT 50 (3,4) 25 to 75 (1,7 to 5,2)
N100A-12-2 115 (7,9) 50 to 150 (3,4 to 10,3)
NPS 4
N100-16-1 2 FNPT 50 (3,4) 25 to 75 (1,7 to 5,2)
N100-16-2 2 FNPT 115 (7,9) 50 to 150 (3,4 to 10,3)
N100-20-2 2-1/2 FNPT 50 (3,4) 25 to 75 (1,7 to 5,2)
Table 1.Bypass Valves (For Large Pumps)
LIQUID METER SIZE TYPE NUMBER BODY SIZE, NPS DIFFERENTIAL PRESSURE
SETTING, PSID (bar d)
DIFFERENTIAL PRESSURE
RANGE, PSID (bar d)
NPS 3/4 or 1 N120-06-3 3/4 FNPT 12 (0,83) 10 to 20 (0,69 to 1,4)
N120-08-3 1 FNPT
PUMPING CAPACITY,
GPM (l/min) TYPE NUMBER BODY SIZE, NPS DIFFERENTIAL PRESSURE SETTING, PSID (bar d)
DIFFERENTIAL PRESSURE
RANGE, PSID (bar d)
5 to 20 (18,9 to 75,7) N110-06-1 3/4 FNPT 50 (3,4) 25 to 75 (1,7 to 5,2)
N110-06-2 100 (6,9) 75 to 150 (5,2 to 10,3)
20 to 40 (75,7 to 151) N110-08-1 1 FNPT 50 (3,4) 25 to 75 (1,7 to 5,2)
N110-08-2 100 (6,9) 75 to 150 (5,2 to 10,3)
Table 2.Bypass Valves (For Small Pumps)
Table 3.Backpressure Valves
The valves can be installed in any position. Make
certain that ow is in the same direction as the arrow
cast on the body.
Use an appropriate pipe compound on the male pipeline
threads. Pull the valve onto the pipe until hand tight and
then wrench tighten it for approximately two additional
turns. Larger size valves may require an additional
amount of torque to obtain a leak free connection.
After installation, pressurize the piping and use a leak
detect solution on all joints to check for leakage. If
leakage is found retighten ttings until leaking stops.

N100, N100A, N110, and N120 Series
3
Types N100, N100A, and N110 Valves
The Types N100 and N100A (see Figure 2) and
Type N110 (see Figure 3) valve outlet piping should be
connected to the tank vapor space. An external
sensing line is not required for these valves.
Type N120 Valve
The Type N120 (see Figure 3) valve outlet piping
should be connected to the tank piping leading to the
hose reel. A 1/4-inch FNPT connection in the closing
cap connects the external sensing line to the tank
vapor space or vapor eliminator.
Principle of Operation
Types N100, N100A, and N110 Bypass Valves
Tank pressure registers through an orice onto the
spring case side of the inner valve (Type N100 or
N100A) or diaphragm (Type N110). When pump
pressure exceeds the tank pressure by the differential
setpoint of the bypass valve, the inner valve lifts off the
seat allowing ow through the valve back into the tank.
Type N120 Backpressure Valve
Pressure from the tank or vapor eliminator loads the
spring case through the external sensing line. When
pressure downstream of the meter registering on the
body side of the diaphragm exceeds the differential
setpoint the inner valve lifts allowing ow to pass
through the valve.
LIQUID PRODUCT
TO VAPOR
SPACE
N100
SERIES
FISHER®
INTERNAL
VALVE
TO FILLER
VALVE
PUMP
TO VAPOR
SPACE
LIQUID PRODUCT
FISHER
INTERNAL
VALVE
PUMP
TO FILLER
VALVE
TYPE
N110
METER
TYPE
N120
CONNECTION
FROM TANK
VAPOR SPACE
OR VAPOR
ELIMINATOR
HOSE
Figure 2. Types N100 and N100A Series Installation Schematic Figure 3. Types N110 and N120 Installation Schematic
Maintenance
Due to normal wear or damage that
may occur from external sources,
Fisher® equipment must be inspected
and maintained periodically.
The frequency of inspection and
replacement of equipment depends
upon the severity of the service
conditions or the requirements of
local, state, federal regulations, and
manufacturer’s instructions.
Do not use these valves if they leak, fail
to work properly, have missing parts or
have been damaged. A properly trained
serviceman should make prompt repairs
or replace the valve. Continued use
without repair can create a hazardous or
injurious situation.
Only use Regulator Technologies
replacement parts.
Periodically inspect and verify the differential setpoint
of the valves.
Adjustment
Each unit is factory set for the standard differential
pressure or which was specied on the order. Settings
can be adjusted with the ranges specied in Table 1,
2, or 3. Remove the closing cap and turn the adjusting
CAUTION

N100, N100A, N110, and N120 Series
4
screw clockwise (into the spring case) to increase
the differential setting or counterclockwise (out of the
spring case) to decrease the setting.
Use a pressure gauge on the outlet of the valve to
monitor the change in the differential pressure setting.
Disassembly and Repair
Release inlet and outlet pressure before
starting repair or disassembly. Failure
to do so could result in personal injury.
Note
Numbers in parenthesis ( ) refer to the
key number in the parts list.
Types N100 and N100A Disassembly
Refer to Figure 4:
1. Remove the 4 screws (key 13) and lock washers
(key 19) and remove the spring case (key 2) from
the body (key 1).
2. Replace the O-rings (keys 11 and 15) and the
capseal (key 16). Coat the new parts with Dow
Corning silicone grease or the equivalent reinstalling.
3. O-ring (key 15) t around the outer diameter of the
capseal (key 16). Do not bend the capseal (key 16)
excessively during reassembly in the body (key 1).
4. Replace the inner valve (key 8) and washer
(key 14) if needed. Grease the outside of the
inner valve (key 8) and gently insert it into and
through the capseal (key 16) as far as it will go. A
slight twisting motion of the inner valve (key 8)
may help in reassembly.
Proper valve operation requires that the
registration hole in the inner valve
(key 8) must face towards the outlet and
not be lled with grease.
5. O-ring (key 12) can be replaced by removing
the spring adjustment assembly (key 4) from the
spring case (key 2).
6. After reassembly, pressure test for leakage and
readjust the setpoint.
!
WARNING
CAUTION
Type N110 Disassembly
Refer to Figure 5:
1. Unscrew the union nut (key 11) and remove the
spring case (key 7) from the body (key 1).
2. To replace the diaphragm (key 4), remove the
diaphragm assembly that includes the
valve plug (key 3).
3. Unscrew the nut (key 6) and remove the
diaphragm head (key 5). Replace the diaphragm
(key 4) and reassemble.
4. O-ring (key 10) can be replaced by removing the
spring adjustment assembly (key 9) from the spring
case (key 7). Coat the new part with Dow Corning
silicone grease or the equivalent before reinstalling.
5. Check the valve plug seat (key 3). Replace if it
is badly scarred or damaged. Make sure that the
2 registration passages are open.
Proper valve operation requires that the
registration hole in the inner valve must
face towards the outlet and not be lled
with grease.
6. Replace the valve guide orice (key 2) if the
seat is badly damaged. A special tool is required
to replace the valve guide orice (key 2).
7. After reassembly, pressure test for leakage and
readjust the setpoint.
Type N120 Disassembly
Refer to Figure 6:
Note
Coat all new O-rings with Dow Corning
silicone grease or the equivalent
before reinstalling.
1. Unscrew the union nut (key 11) and remove the
spring case (key 7) from the body (key 1).
2. To replace the diaphragm (key 4), remove the
diaphragm assembly that includes the
valve plug (key 3).
CAUTION

N100, N100A, N110, and N120 Series
5
3. Unscrew the nut (key 6) and remove the
diaphragm head (key 5). Replace the diaphragm
(key 4) and reassemble. Reassemble with loctite
on the valve plug (key 3) threads.
4. To replace the O-ring seal (key 17), remove the
screw (key 19) and the O-ring washer (key 18).
Reinstall the screw (key 19) and O-ring washer
(key 18). Place a small amount of Loctite on the
screw (key 19) before reassembly and tighten.
5. Replace the valve guide orice (key 2) if the seat
is badly damaged or O-ring (key 16) is leaking.
A special tool is required to replace the valve
guide orice (key 2). Replace the O-ring (key 16)
and reassemble the valve guide orice (key 2) by
rmly seating into the body (key 1).
6. O-ring (key 10) can be replaced by removing the
seal cap (key 12).
7. After reassembly, pressure test for leakage and
readjust the setpoint.
Parts Ordering
When corresponding with your local Distributor about
this equipment, include the type number and all other
pertinent information printed on the label. Specify
the eleven-character part number when ordering new
parts from the following parts list.
Parts List
Types N100 and N100A Bypass Valve
(Figure 4)
Key Description Part Number
1 Body, Ductile iron
NPS 1 2P384419232
NPS 1-1/4 2P383219172
NPS 1-1/2 2P382719232
NPS 2 3R195119232
NPS 2-1/2 3R195219232
2 Spring Case, Ductile iron
Types N100 and N100A (NPS 1 thru 1-1/2) 1P382819172
Type N100 (NPS 2 and 2-1/2) 2R195419272
3 Closing Cap, Aluminum
Types N100 and N100A (NPS 1 thru 1-1/2) 1P382947062
Type N100 (NPS 2 and 2-1/2) 1P360809022
Figure 4. Types N100 and N100A Bypass Valve Assembly
BP3845
INSTALL OPENING
IN POSITION SHOWN (GREASE
MUST NOT FILL HOLE)
DC - USE DOW CORNING NO. 3 GREASE
AS - USE ANTI-SEIZE ON THREADS
DC
3
12
2
4
13
4
14
16
1
7
AS
4
19
6
DC
11
15
8

N100, N100A, N110, and N120 Series
6
Type N100 and N100A Bypass Valve
(Figure 4) (continued)
Key Description Part Number
4 Spring Adjuster Assembly, Aluminum/Stainless steel
Types N100 and N100A (NPS 1 thru 1-1/2) 1P3837000A2
Type N100 (NPS 2 and 2-1/2) 1R1963000A2
6 Spring, Stainless steel
NPS 1 thru 1-1/2
25 to 75 psig (1,7 to 5,2 bar) 1P384137022
50 to 150 psig (3,45 to 10,3 bar) 1P383838992
NPS 2 and 2-1/2
25 to 75 psig (1,7 to 5,2 bar) 1R195537022
50 to 150 psig (3,5 to 10,3 bar) 1R1956T0012
7* Adjusting Screw Gasket
Types N100 and N100A (NPS 1 thru 1-1/2) Nylon (PA) 1P383006162
Type N100 (NPS 2 and 2-1/2), Steel 1P417928992
8* Inner Valve, Stainless steel
Type N100 (NPS 1 thru 1-1/2) 1P383546172
Type N100A (NPS 1 thru 1-1/2) T1157735032
Type N100 (NPS 2 and 2-1/2) 1R195746172
9 Drive Screw, 18-8 Stainless steel (2 required) 1A368228982
Figure 5. Type N110 Bypass Valve Assembly
STAMP TYPE NUMBER, SPRING RANGE, AND DATE
AS
12
10
13
9
9
9
1
14
6
9
7
8
5
4
11
2
3
AS - USE ANTI-SEIZE ON THREADS
T10583
Key Description Part Number
11* O-Ring, Nitrile (NBR)
Types N100 and N100A (NPS 1 thru 1-1/2) T12942T0012
Type N100 (NPS 2 and 2-1/2) 1R195806992
12* O-Ring, Nitrile (NBR)
Types N100 and N100A (NPS 1 thru 1-1/2) T12946T0012
Type N100 (NPS 2 and 2-1/2) T12945T0012
13 Screw, Steel (4 required)
Types N100 and N100A (NPS 1 thru 1-1/2) 1V1542X0012
Type N100 (NPS 2 and 2-1/2) T12724T0012
14 Washer, Stainless steel
Types N100 and N100A (NPS 1 thru 1-1/2) 1P383935132
Type N100 (NPS 2 and 2-1/2) 1R196035012
15* O-Ring, Nitrile (NBR)
Types N100 and N100A (NPS 1 thru 1-1/2) T12947T0012
Type N100 (NPS 2 and 2-1/2) T12941T0012
16* Cap Seal,
Polytetrauoroethylene (PTFE)/Molybdenite (MoS2)
Types N100 and N100A (NPS 1 thru 1-1/2) 1P384306442
Type N100 (NPS 2 and 2-1/2) 1R196206442
17 Pipe Plug, Carbon steel T13718T0012
19 Lock Washer, Carbon plated-steel (4 required)
Types N100 and N100A (NPS 1 thru 1-1/2) 1C225728982
Type N100 (NPS 2 and 2-1/2) 1A505628982
*Recommended spare part

N100, N100A, N110, and N120 Series
7
Figure 6. Type N120 Backpressure Valve Assembly
AS - USE ANTI-SEIZE
ON THREADS
T10695
STAMP TYPE NUMBER,
SPRING SETTING, AND DATE
LOCTITE
LOCTITE
GRADE D
PART NOT SHOWN: KEY 15
12
AS
10
13
9
9
9
6
14
116 17 19 18
3
2
11
4
5
8
7
9

N100, N100A, N110, and N120 Series
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 specications 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., 2002, 2009; All Rights Reserved
LP-Gas Equipment
Emerson Process Management
Regulator Technologies, Inc.
USA - Headquarters
McKinney, Texas 75070 USA
Tel: [phone]
Outside U.S. 1-972-548-3574
For further information visit www.emersonprocess.com/regulators/lp
Types N110 and N120 Bypass and
Backpressure Valve (Figures 5 and 6)
Key Description Part Number
1 Body, Ductile iron
NPS 3/4 T1058019232
NPS 1 T1058419232
2* Valve Guide Orice, Aluminum T20819T0012
3 Valve Plug, 303 Stainless steel
Type N110 T1058135022
Type N120 T1069235032
4* Diaphragm, Nitrile (NBR) 1E621702052
5 Diaphragm Head, Aluminum T1057809012
6 Nut, Zinc-plated steel T1059325552
7 Spring Case, Ductile iron T1057519232
8 Spring, Stainless steel
25 to 75 psig (1,7 to 5,2 bar) T1057737082
50 to 150 psig (3,5 to 10,3 bar) T1057637082
12 psig (0,83 bar) T1069737022
Key Description Part Number
9 Spring Adjustment Assembly, Steel/Stainless steel
Type N110 T10579000A2
Type N120 T10699000A2
10* O-Ring, Nitrile (NBR)
Type N110 T12946T0012
Type N120 T1069606562
11 Union Nut, Ductile iron 1E471119062
12 Seal Cap, Aluminum
Type N110 1P382947062
Type N120 T1069347062
13* Washer, Nylon (PA) 1P383006162
14 Pipe Plug, Carbon steel T13718T0012
16* O-Ring (Type N120 Only), Nitrile (NBR) 1K314806992
17* O-Ring (Type N120 Only), Nitrile (NBR) T12945T0012
18 O-Ring Washer (Type N120 Only), 303 SST 1D335935072
19 Machine Screw (Type N120 Only), Carbon plated-steel 16A0429X012
*Recommended spare part