Instruction Manual
D103232X012
August 2018
161 Series
161 Series Pilots for Pilot-Operated Pressure
Reducing Regulators
WARNING
!
Failure to follow these instructions or
to properly install and maintain this
equipment could result in an explosion,
re and/or chemical contamination
causing property damage and personal
injury or death.
Fisher™ regulators must be installed,
operated and maintained in accordance
with federal, state and local codes, rules
and regulations and Emerson Process
Management Regulator Technologies,
Inc. (Emerson) instructions.
If the regulator vents gas or a leak
develops in the system, service to
the unit may be required. Failure
to correct trouble could result in a
hazardous condition.
Installation, operation and maintenance
procedures performed by unqualied
personnel may result in improper
adjustment and unsafe operation. Either
condition may result in equipment
damage or personal injury. Only a
qualied person shall install or service
the 161 Series regulator.
W7430
TYPE 161AY
W6505
TYPE 161EB
Introduction
Scope of the Manual
This manual provides installation, startup,
maintenance and parts ordering information for the
161 Series Pilots used together with pilot-operated
pressure reducing regulators in low and high-pressure
applications. For information on mounting on
Figure 1. 161 Series Pilot
pilot-operated regulators, monitoring systems and
installations, refer to full product literature:
Type EZR: D102600X012
Type EZL: D103091X012
161 Series
Specications
The Specications section lists pressure limitations and other specications for all models of 161 Series pilots.
Please note that the pilot control spring range is marked on the spring case of 161 and 161EB Series pilots and
on the nameplate of 161AY Series pilots.
Outlet (Control) Pressure Ranges
See Table 1
Proportional Bands
See Table 1
Maximum Inlet Pressure
(1)
See Table 2
1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
Pilot Flow Coefcients
See Table 3
Options
Type 252 Pilot supply lter
Pilot Sping Case Vent
1/4 NPT (internal)
Table 1. Outlet (Control) Pressure Ranges, Proportional Bands and Pilot Control Spring Information
OUTLET (CONTROL)
PILOT TYPE
161 or 161M
161AY, 161AYM
or 161AYW
161EB or
161EBM
161EBH or
161EBHM
1. Proportional band includes outlet pressure drop plus hysteresis (friction), but does not include lockup.
2. Proportional band was determined with a pressure drop ranging from 50 to 150 psig / 3.4 to 10.3 bar. Approximately double the proportional band if the pressure drop is less than
50 psig / 3.4 bar.
3. With Type 112 restrictor set on 2.
4. The spring ranges for the Type 161AYW is 3 to 12 in. w.c. / 7.5 to 30 mbar.
5. The spring ranges for the Type 161AYW is 11 to 25 in. w.c. / 27 to 62 mbar.
6. The spring ranges for the Type 161AYW is 0.9 to 2.5 psig / 0.06 to 0.17 bar.
7. Proportional band was determined with a pressure drop ranging from 100 to 300 psig / 6.9 to 20.7 bar. Approximately double the proportional band if the pressure drop is less than
100 psi / 6.9 bar
PRESSURE RANGE
psig bar psig bar In. mm In. mm
5 to 15 0.34 to 1.03 2 0.14 1E392527022 Yellow 0.148 3.76 2.00 50.8
10 to 125 0.69 to 8.62 2 0.14 1K748527202 Red 0.192 4.88 2.19 55.6
120 to 300 8.3 to 20.7 6 0.41 15A9258X012 Green 0.243 6.17 1.88 47.8
6 to 15 in. w.c.
0.5 to 1.2
1.2 to 2.5
130 to 200 8.96 to 13.8 1.5 0.10 17B1263X012 Blue 0.262 6.66 3.85 97.8
200 to 350 13.8 to 24.1 3 0.21 17B1264X012 Red 0.294 7.47 4.22 107
250 to 450 17.2 to 31.0 3.5 0.24
400 to 700 27.6 to 48.2 7 0.48
(4)
15 to 37 mbar
(5)
0.03 to 0.08
(6)
0.08 to 0.17
2.5 to 4.5 0.17 to 0.31 0.5 0.03 1B537227022 Light Blue 0.187 4.75 3.94 100
4.5 to 7 0.31 to 0.48 0.5 0.03 1B537327052 Black 0.218 5.54 3.98 101
5 to 15 0.34 to 1.03 0.5 0.03 17B1260X012 White 0.120 3.05 3.75 95.2
10 to 40 0.69 to 2.76 0.5 0.03 17B1262X012 Yellow 0.148 3.76 3.75 95.2
30 to 75 2.07 to 5.17 0.6 0.04 17B1259X012 Black 0.187 4.75 4.00 102
70 to 140 4.83 to 9.65 1.3 0.09 17B1261X012 Green 0.225 5.71 3.70 94.0
(4)
(5)
1 in. w.c 2 mbar 1B537027052 Yellow 0.114 2.90 4.31 109
(6)
0.5 0.03 1B537127022 Green 0.156 3.96 4.06 103
PROPORTIONAL
(1)(2)(3)
BAND
1 in. w.c 2 mbar 1B653927022 Olive Green 0.105 2.67 3.75 95.2
Part Numbers Color Code
(7)
17B1263X012 Blue 0.262 6.66 3.85 97.8
(7)
17B1264X012 Red 0.294 7.47 4.22 107
PILOT CONTROL SPRING INFORMATION
Wire Diameter Free Length
TYPE
161 1500 103 1200 82.7
161AY 150 10.3 150 10.3
161EB and 161EBH 1500 103 1200 82.7
161M 1500 103 1200 82.7 1500 103
161AYM or 161AYW 150 10.3 150 10.3 150 10.3
161EBM and 161EBHM 1500 103 1200 82.7 1500 103
1. Maximum pressure to prevent the casings from bursting during abnormal operation (leaking to atmosphere and internal parts damage may occur).
MAXIMUM INLET PRESSURE
psig bar psig bar psig bar
2
Table 2. Pilot Pressure Ratings
MAXIMUM EMERGENCY
OUTLET PRESSURE OR MAXIMUM
EMERGENCY SENSE PRESSURE
MAXIMUM BLEED (EXHAUST) PRESSURE
(1)
FOR MONITOR PILOTS
- - - -
Orice Size C
3/32 in. / 2.4 mm
1/8 in. / 3.2 mm
1/4 in. / 6.4 mm
Table 3. Pilot Flow Coefficients
161AY SERIES 161EB SERIES
6.9
12.3
50
g
C
0.20
0.35
1.43
v
C
1
35
35
35
Orice Size C
1/8 in. /
3.18 mm
g
8.5 0.28 30.4
161 Series
C
v
C
1
Product Description
The 161 Series pilots are mainly used in natural
gas, air or other non-corrosive gas applications. For
applications that have high pressure drops, using a
Type 161AYM, 161EBM or 161EBHM monitor pilot will
increase the accuracy of the regulator.
161 Series pilot models are the following:
Type 161—Downstream pressure range from 5 to
300 psig / 0.34 to 20.7 bar. Pilot bleed exhausts
downstream through the sense (control) line.
Type 161M—Downstream pressure range from
5 to 300 psig / 0.34 to 20.7 bar. A static sensing
(control) line is isolated from pilot bleed (exhaust).
The Type 161M is used in working monitor and other
application that require a sense (control) line isolated
from pilot bleed (exhaust).
Type 161AY—Low-pressure pilot with an outlet
pressure range from 6 in. w.c. to 7 psig / 15 mbar to
0.48 bar. Pilot bleeds (exhausts) downstream through
the sense (control) line.
Type 161AYM—The monitor version of the
Type 161AY pilot. The pilot bleed (exhaust) is
isolated from the sense (control) line. This pilot is
used in monitoring systems requiring an isolated pilot
bleed (exhaust).
Type 161AYW- A version of the Type 161AY used
solely as the upstream monitor pilot on a working
monitor setup.
Type 161EB—High accuracy pilot with an outlet
pressure range from 5 to 350 psig / 0.34 to 24.1 bar.
Pilot bleeds (exhausts) downstream through the sense
(control) line.
Type 161EBM—The monitor version of the
Type 161EB pilot. The pilot bleed (exhaust) is
isolated from the sense (control) line. This pilot is
used in monitoring systems requiring an isolated pilot
bleed (exhaust).
Type 161EBH—The high pressure version of the
Type 161EB pilot with an outlet pressure range from
250 to 700 psig / 17.2 to 48.3 bar.
Type 161EBHM—The high pressure version of the
Type 161EBM pilot with an outlet pressure range from
250 to 700 psig / 17.2 to 48.3 bar.
Principle of Operation
As long as the outlet (control) pressure is above
the outlet pressure setting, the pilot valve plug or
disk remains closed. Force from the main spring,
in addition to inlet pressure bleeding through the
Type 112 restrictor, provides downward loading
pressure to keep the main valve diaphragm and plug
assembly tightly shutoff. When the outlet pressure
decreases below the pilot outlet pressure setting, the
pilot plug or disk assembly opens. Loading pressure
bleeds downstream through the pilot faster than it
can be replaced through the Type 112 restrictor. This
reduces loading pressure on top of the main valve
diaphragm and plug assembly and lets the unbalanced
force between inlet and loading pressure overcome
the main spring force to open the regulator diaphragm
and plug assembly.
As the outlet pressure rises toward the outlet pressure
setting, it compresses the pilot diaphragm against the
pilot control spring and lets the pilot valve plug close.
Loading pressure begins building on the regulator
diaphragm and plug assembly. The loading pressure,
along with force from the main spring, pushes the
diaphragm and plug assembly onto the knife-edged
seat, producing tight shutoff.
Installation
WARNING
!
Personal injury or equipment damage,
due to bursting of pressure-containing
parts may result if this regulator is
overpressured or is installed where
service conditions could exceed any
rating of the adjacent piping of piping
connections. To avoid such injury or
damage, provide pressure-relieving or
pressure-limiting devices to prevent
service conditions from exceeding those
limits. Also, be sure the installation is
in compliance with all applicable codes
and regulations. Additionally, physical
damage to the regulator could break
the pilot off the main valve, causing
3
161 Series
personal injury and property damage
due to bursting of pressure-containing
parts. To avoid such injury and damage,
install the regulator in a safe location.
1. Use qualied personnel when installing, operating
and maintaining pilots. Before installing, inspect
pilot and tubing, for any shipment damage or
foreign material that may have collected during
crating and shipment. Make certain that body is
clean and the pipelines are free of foreign material.
WARNING
!
In hazardous or ammable gas service,
vented gas may accumulate and cause
personal injury, death or property
damage due to re or explosion. Vent
a regulator in hazardous gas service
to a remote, safe location away from
air intakes or any hazardous location.
The vent line or stack opening must
be protected against condensation
or clogging.
2. Pilots have a 1/4 NPT vent connection in the
spring case. To remotely vent gas from the spring
case, remove the screened vent and connect
1/4 in. / 6.4 mm piping or tubing. It should vent to
a safe location, have as few elbows as possible
and have a screened vent on its exhaust. Install
the regulator and any remote vent spring or tubing
so that the vent is protected from condensation,
freezing or substance that may clog it.
CAUTION
To avoid freeze-up because of pressure
drop and moisture in the gas, use
anti-freeze practices, such as heating
the supply gas or adding a de-icing
agent to the supply gas.
3. Run a 3/8 in. / 9.5 mm outer diameter or larger
pilot supply line from the upstream pipeline to the
lter inlet, bushing the line down to t the 1/4 NPT
lter connection. Do not make the upstream
pipeline connection in a turbulent area, such as
near a nipple, swage or elbow. If the maximum
pilot inlet pressure could exceed the pilot rating,
install a separate pressure reducing regulator in
the pilot supply line. Install a hand valve in the pilot
supply line and provide vent valves to properly
isolate and relieve the pressure from the regulator.
4. Attach a 1/2 in. / 13 mm piping or tubing
downstream control line to the 1/2 NPT control
line connection on the actuator casings. Connect
the other end of the control line to the pipeline
downstream of the regulator. Do not attach the
control line near any elbow, swage, block valve
or any other location that might cause turbulence.
Install a full port ball valve in the control line
to shut off the control pressure when using
the bypass.
Startup and Adjustment
Pre-Startup Considerations
Each regulator is factory-set for the outlet pressure
specied on the order. If no setting was specied,
outlet pressure was factory-set at the mid-range of
the pilot control spring. Before beginning the startup
procedure in this section, make sure the following
conditions are in effect:
• Block valves isolate the regulator
• Vent valves are closed
• A bypass, if any, is in operation
In all cases, check the control spring setting to make
sure it is correct for the application.
CAUTION
Be sure to slowly introduce pressure
into the system to prevent downstream
overpressure due to potential rapid
pressure increase. Pressure gauges
should always be used to monitor
downstream pressure during startup.
Procedures used in putting this
regulator into operation must be planned
accordingly if the downstream system is
pressurized by another regulator or by a
manual bypass.
Pilot Adjustment
For 161 Series pilots, remove the pilot closing cap
(key 16, Figures 4 through 6 or key 22, Figure 7)
and, on 161EB Series only, loosen the locknut
(key 12, Figure 4). Turn the adjusting screw (key 11,
Figures 4 through 6 or key 35, Figure 7) into the
4
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