This manual provides instructions for the installation,
maintenance, and parts ordering information for
Types CS200IN, CS200IR, CS205IN, CS205IR, and
CS206IR service regulators.
D103119X012
CS200 Series
Table 1. Available Congurations
TYPE NUMBEROPTIONS
CS20
OVERPRESSURE PROTECTION MODULE
0Without Overpressure Protection Module
5With Secondary Seat™ Protection
6
IInternal Registration
Table 2. Inlet Pressure Ratings and Flow and Sizing Coefcients
MAXIMUM
TYPE
CS200
CS205
and
CS206
1. Inlet pressures based on lockup performance. For maximum inlet pressure values with optimum regulating performance, refer to the applicable Flow Capacity Table on CS200 Series Bulletin.
2. To comply with ANSI B109.4 relief requirements, the maximum inlet pressure may need to be reduced.
With Secondary Seat Protection with bleed to indicate Secondary Seat
is functioning
PRESSURE REGISTRATION
RELIEF
NNon-Relief
RInternal Relief
MAXIMUM
(2)
FLOW
COEFFICIENTS
(WIDE-OPEN)
g
120.4300.530.87
C
v
C
1
IEC SIZING COEFFICIENTS
X
T
F
D
0.89
F
L
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
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. (Regulator
Technologies) instructions.
2
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.
Call a gas service person to service the
unit. Only a qualied person shall install
or service the regulator.
Description
The CS200 Series regulators are typically installed
on industrial and commercial applications. All
constructions include internal pressure registration.
Types CS200IR, CS205IR, and CS206IR contain an
internal relief valve. Types CS200IN and CS205IN do
not contain internal relief.
CS200 Series
Specications
The Specications section lists the specications for the regulators. The following information is stamped on the
regulator at the factory: type number, date of manufacture, spring range, orice size, maximum inlet pressure, maximum
operating outlet pressure, and outlet pressure which may damage regulator parts.
Available Congurations
Type CS200IN: Basic construction with Internal
pressure registration and Non-Relieving
diaphragm assembly
Type CS200IR: Basic construction with Internal
pressure registration and Relieving
diaphragm assembly
Type CS205IN: Type CS200IN with
TM
Secondary Seat
Protection
Type CS205IR: Type CS200IR with
Secondary Seat Protection
Type CS206IR: Type CS200IR with
Secondary Seat Protection with bleed to indicate that
the Secondary Seat is providing lockup
See also Table 1
Body Sizes, End Connection Style, and
Pressure Rating
(1)
See Table 4
Outlet Pressure Ranges
See Table 3
Spring Case Vent Connection
Orice Sizes
See Table 2
Flow and IEC Sizing Coefcients
See Table 2
Maximum Inlet Pressures
Emergency: 175 psig / 12.1 bar
Operating: See Table 2
Maximum Outlet Pressures
Casing: 25 psig / 1.7 bar
To Avoid Internal Parts Damage:
5 psi / 0.34 bar differential above outlet
pressure setting
Operating: 2 psig / 138 mbar
Temperature Capabilities
-20 to 150°F / -29 to 66°C
Pressure Registration
Internal
Approximate Weight
8 pounds / 3.6 kg
1 NPT
1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
2. Product has passed Regulator Technologies testing for lockup, relief start-to-discharge and reseal down to -40°.
(1)
(1)
(1)(2)
Table 3. Outlet Pressure Ranges
SERIES
CS200
SPRING RANGE
Inches w.c.mbarInchmmInchmm
3.5 to 5
4.5 to 6.5
6 to 8
7.5 to 11
10 to 14
12 to 19
18 to 1 psig
1 to 2 psig
9 to 12
11 to 16
15 to 20
19 to 27
25 to 35
30 to 47
45 to 69
Table 4. Body Sizes, Material, End Connection, and Pressure Rating
SERIESBODY SIZE, NPSEND CONNECTIONBODY MATERIAL
3/4
3/4 x 1
CS200
3/4 x 1-1/4
1
1 x 1-1/4
1-1/4
NPTGray Cast Iron17512.1
SPRING WIRE DIAMETERSPRING FREE LENGTH
0.102
0.090
0. 111
0.112
0.102
0.112
0.120
0.145
2.59
2.28
2.82
2.84
2.59
2.84
3.04
3.68
psigbar
3.95
4.32
4.48
4.40
4.78
4.40
4.94
4.66
PRESSURE RATING
100
110
114
112
121
112
125
118
3
CS200 Series
ERAA03487
RELIEF VALVE STEM
DISK
VALVE STEM
ORIFICE
LEVER
WIRE SEAL (OPTIONAL)
PUSHER POST
CONTROL SPRING
RELIEF VALVE SPRING
DIAPHRAGM
RELIEF SEAT
PRESSURE RETAINING PLUG
(DO NOT REMOVE)
Figure 2. Type CS200IR Pressure Reducing Regulator with Internal Relief Operational Schematic
Principle of Operation
Type CS200 Base Regulator Operation
Refer to Figure 2. When downstream demand decreases,
the pressure under the diaphragm increases. This pressure
overcomes the regulator setting (which is set by the control
spring). Through the action of the pusher post assembly,
lever, and valve stem, 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 downward
and the valve disk moves away from the orice.
CS200 Series with Internal Relief
Refer to Figure 2. The option for Internal Relief is offered
on the Types CS200 and CS205 and is standard on the
Type CS206. Internal relief is used to help minimize
overpressure. Any outlet pressure above the start-todischarge point of the non-adjustable relief spring moves the
diaphragm off of the relief seat, allowing excess pressure
to discharge through the vent. Typical start-to-discharge
values are 7 inches w.c. to 1.5 psi / 17 to 103 mbar above
the outlet pressure setting, depending on control spring and
if the Secondary Seat™ option is present. Refer to Table 5
for Type CS205 lockup values and Type CS206 downstream
build-up values. Refer to the CS200 Series Bulletin for
additional information regarding Internal Relief start-to-
discharge both with and without Secondary Seat Protection.
If emergency conditions should exist that prevent normal
operation of the regulator or internal relief valve, the relief
valve stem acts as a secondary travel stop contacting the
underside of the closing cap and stopping the upward travel
of the relief seat. When the diaphragm continues to rise as
downstream pressure builds, the diaphragm lifts off of the
relief seat to provide relief operation.
Type CS205 with Secondary
Seat Protection
Refer to Figure 3. The Type CS205 provides
Secondary Seat Protection. As downstream demand
decreases and downstream pressure rises to the regulator
pressure lockup value, the regulator will lock up. If,
however, damage has occurred to the primary disk, to the
primary orice’s seating surface, or debris has become
lodged between the primary disk and primary orice,
the outlet pressure will continue to rise. This additional
pressure causes the primary disk to apply additional force
to the orice seating surface, which causes the Secondary
seating surface to move toward the Secondary disk or
sealing surface. If downstream demand decreases to
zero, then the secondary seating surface will contact
the sealing surface to provide lockup. Refer to
Table 5 for approximate lockup values provided by the
Secondary Seat.
Figure 3. CS200 Series with Secondary Seat Protection
Type CS206 Secondary Seat Protection
with Bleed
The Type CS206 provides small bleed to the downstream
system as an indication that the Secondary Seat is
providing lockup. In the event that the primary orice
and disk cannot provide lockup, the secondary seating
surface will move into contact with a metal disk. This
metal to metal interface will allow a small amount of gas
to bleed downstream thereby increasing outlet pressure
until the Internal relief valve begins to discharge gas
to the atmosphere. The odor of this discharged gas
provides an indication that the regulator is relying on
the Secondary Seat for overpressure protection. See
Table 5 for the Downstream Pressure Build-up of the
LOCKUP
SECONDARY SEAT
LOCKUP
TYPE CS206
SECONDARY SEAT WITH
METAL TO METAL BLEED
Internal relief acting in conjunction with the Type CS206
Secondary Seat Assembly.
Types CS205 and CS206 Secondary Seat
Protection Limitations
CAUTION
Overpressure conditions can occur
in the downstream piping when the
Secondary Seat Protection is
installed. The Secondary Seat Protection
serves only as a backup to the primary
seat for lockup. Refer to the sections on
Overpressure Protection and Maintenance.
UnpaintedGE30224X01210 to 1425 to 3514355.8141.26 psig87
OrangeGE30225X01218 to 1 psig45 to 691 psig697.8191.90 psig131
BlackGE30190X0121 to 2 psig69 to 1382 psig13813323.42 psig236
1. Shutoff with primary orice / seating surface disabled.
2. Shutoff and build-up per ANSI B109.4 at 125 psig / 8.6 bar inlet pressure.
Secondary Seat
above Setpoint
Shut-off
(1)(2)
Downstream Pressure
Build-up
Secondary Seat Protection does not provide additional
overpressure protection in the event the secondary seat
or disk is damaged by debris or contamination in the
pipeline, or from conditions that would cause the regulator
to go wide-open. When selecting Secondary Seat
Protection, it is recommended that:
• Internal Relief is also selected, or the addition of
some other method of overpressure protection be
added in the downstream system as discussed in the
Overpressure Protection section; and
• A periodic downstream lock-up pressure test is done
to determine if the Secondary Seat Protection option
is serving as the primary seat for shutoff, thereby
indicating that the primary orice/seat or the disk
are no longer providing shutoff. This determination
is made by checking if the regulator lock-up value is
elevated to or near the values indicated in Table 5,
under the heading Type CS205
Installation and
Overpressure Protection
WARNING
!
Personal injury or system damage may
result if this regulator is installed, without
appropriate overpressure protection,
where service conditions could exceed the
limits given on the regulator nameplate.
Regulator installations should
be adequately protected from
physical damage.
All vents should be kept open to permit
free ow of gas to the atmosphere. Protect
openings against entrance of rain, snow,
insects, or any other foreign material
that may plug the vent or vent line. On
outdoor installations, point the spring case
vent downward to allow condensate to
drain (seeFigure 4). This minimizes the
possibility of freezing and of water or other
foreign materials entering the vent and
interfering with proper operation.
Under enclosed conditions or indoors,
escaping gas may accumulate and be an
explosion hazard. In these cases, the vent
should be piped away from the regulator to
the outdoors.
CAUTION
The CS200 Series regulators have an
outlet pressure rating lower than their
inlet pressure rating. If actual inlet
pressure can exceed the outlet pressure
rating, outlet overpressure protection is
necessary. However, overpressuring any
portion of the regulators beyond the limits
in the Specications section may cause
leakage, damage to regulator parts, or
personal injury due to bursting of pressurecontaining parts.
Some type of external overpressure
protection should be provided if inlet
pressure will be high enough to damage
downstream equipment. Common methods
of external overpressure protection include
relief valves, monitoring regulators, shutoff
devices, and series regulation.
If the regulator is exposed to an
overpressure condition, it should be
inspected for any damage that may
have occurred. Regulator operation
below these limits does not preclude
the possibility of damage from external
sources or from debris in the pipeline.
6
CS200 Series
General Installation Instructions
Before installing the regulator,
• Check for damage, which might have occurred
during shipment.
• Check for and remove any dirt or foreign material,
which may have accumulated in the regulator body.
• Blow out any debris, dirt or copper sulfate in copper
tubing and the pipeline.
• Apply pipe compound to the external threads of the
pipe before installing the regulator.
• Make sure gas ow through the regulator is in the
same direction as the arrow on the body. “Inlet” and
“Outlet” connections are clearly marked.
Installation Location
• The installed regulator should be adequately
protected from vehicular trafc and damage from
other external sources.
• Install the regulator with the vent pointed vertically
down, seeFigure 4. If the vent cannot be installed
in a vertically down position, the regulator must be
installed under a separate protective cover. Installing
the regulator with the vent down allows condensation
to drain, minimizes the entry of water or other debris
from entering the vent, and minimizes vent blockage
from freezing precipitation.
• Do not install the regulator in a location where
there can be excessive water accumulation or ice
formation, such as directly beneath a downspout,
gutter, or roof line of building. Even a protective
hood may not provide adequate protection in
these instances.
• Install the Regulator so that any gas discharge through
the vent or vent assembly is over 3 feet / 0.91 m away
from any building opening.
Regulators Subjected to Heavy
Snow Conditions
Some installations, such as in areas with heavy snowfall,
may require a hood or enclosure to protect the regulator
from snow load and vent freeze over.
Installation with External
Overpressure Protection
If the regulator is used in conjunction with a Type 289H
relief valve, it should be installed as shown in Figure 4.
The outside end of the vent line should be protected with
a rainproof assembly.
The Type 289H is typically set 10-inches w.c. / 25 mbar
higher than the outlet pressure setting of the regulator, up
to 30 inches w.c. / 75 mbar outlet pressure. For pressure
greater than this, set the Type 289H 0.75 psi / 0.05 bar
higher than the outlet pressure setting of the regulator.
PROTECT VENT PIPE
WITH RAIN CAP
CS200 SERIES
REGULATOR
TYPE 289H
RELIEF VALVE
REGULATOR VENT
POINTED DOWNWARD
Figure 4. CS200 Series Regulator Installed with Vent Pointed
Downward and with a Type 289H Relief Valve
for High Capacity Relief
Vent Line Installation
The CS200 Series regulators have a 1 NPT screened
vent opening in the spring case. If necessary to vent
escaping gas away from the regulator, install a remote
vent line in the spring case tapping. Vent piping should
be as short and direct as possible with a minimum
number of bends and elbows. The remote vent line
should have the largest practical diameter. Vent piping
on regulators with internal relief must be large enough
to vent all relief valve discharge to atmosphere without
excessive backpressure and resulting excessive pressure
in the regulator.
Periodically check all vent openings to be sure that they
are not plugged or obstructed.
Outlet pressure ranges are shown on Table 3. Outlet
pressure greater than 5 psi / 0.34 bar above the setpoint
may damage internal parts such as the diaphragm head
and valve disk. The maximum emergency (casing)
outlet pressure is 25 psig / 1.7 bar.
Startup
CAUTION
Pressure gauges must 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.
7
CS200 Series
If the downstream system is not pressurized by another
regulator or manual bypass valve, use the following
procedure to startup the regulator.
1. Check to see that all appliances are turned off.
2. Slowly open the upstream shutoff valve.
3. Check inlet and outlet pressure for correct values.
4. Check all connections for leaks.
5. Turn on utilization equipment and recheck
the pressures.
Adjustment
Note
The range of allowable pressure setting is
stamped on the nameplate. If the required
setting is not within this range, substitute
the correct spring (as shown in Table 3). If
the spring is changed, change the nameplate
to indicate the new pressure range.
A pressure gauge must always be used to monitor
downstream pressure while adjustments are being made.
1. Remove the closing cap (key 60, Figure 5).
2. To increase the outlet setting, turn the adjusting screw
(key 65, Figure 5) clockwise. To decrease the outlet
setting, turn the adjusting screw counterclockwise.
3. Replace the closing cap.
Shutdown
Installation arrangements may vary, but in any
installation it is important that the valves be opened or
closed slowly and that the outlet pressure be vented
before venting inlet pressure to prevent damage caused
by reverse pressurization of the regulator. The steps
below apply to the typical installation as indicated.
1. Open valves downstream of the regulator.
2. Slowly close the upstream shutoff valve.
3. Inlet pressure should be automatically released
downstream as the regulator opens in response to the
lowered pressure on the diaphragm.
4. Close outlet shutoff valve.
Maintenance
WARNING
!
To avoid personal injury or equipment
damage, do not attempt any maintenance
or disassembly without rst isolating the
regulator from system pressure and relieving
all internal pressure as described
in “Shutdown”.
Regulators that have been disassembled for
repair must be tested for proper operation
before being returned to service. Only parts
manufactured by Regulator Technologies
should be used for repairing Fisher
regulators. Restart gas utilization equipment
according to normal startup procedures.
Due to normal wear or damage that may
occur from external sources, this regulator
should be inspected and maintained
periodically. The frequency of inspection
and replacement of parts depends upon
the severity of service conditions or the
requirement of local, state, and federal
rules and regulations.
®
Maintenance on Types CS205 and CS206
Secondary Seat™ Protection
The Type CS205 regulator does not have any means
to alert when the Secondary Seat operates at lockup.
Therefore it is recommended that a periodic lockup
test be done on the regulator to determine if the lockup
pressure has elevated to the values in Table 5. If so, the
regulator primary disk and orice should be replaced.
Types CS205IR and CS206IR have internal relief. Internal
relief operation on these units is an indication that the
Secondary Seat Protection on the Type CS205IR may not
be working and that the Type CS206 Secondary Seat may
have closed. Maintenance should address any potential
causes for internal relief operation as well as other
regulator malfunctions separate from the Secondary Seat.
Disassembly to Replace Diaphragm
1. Remove the closing cap (key 60,Figure 5). Turn the
adjusting screw (key 65) counterclockwise to ease
spring compression.
2. Remove the adjusting screw and spring (key 38).
3. Remove hex nuts (key 16) and cap screws (key 15).
Separate the upper spring case (key 1) from
the lower casing assembly (key 9). Note
vent orientation.
Note
When disassembling a CS200 Series
regulator, lift the upper spring case
straight up in order to avoid hitting the
relief valve stem (key 44, Figure 5).
4. Slide the diaphragm assembly (key 55) away from
the body (key 70) to unhook the pusher post (key 51)
from the lever (key 10). Lift off the diaphragm head
assembly (key 55).
5. For Types CS200IN and CS205IN (Non-relieving units), unscrew the retainer screw (key 45, Figure 6)
using a 5/8-inch / 16 mm wrench. The screw retainer
8
CS200 Series
fastens the lower spring seat (key 43) to the pusher
post (key 51). Unscrewing the screw retainer will
separate the lower spring seat (key 43), diaphragm
and diaphragm assembly (key 55), and pusher post
(key 51).
For Type CS200IR, CS205IR, and CS206IR (units
with internal relief), press down on the upper spring
retainer (key 42, Figure 6) using a 9/16-inch / 14 mm
box-end wrench and remove the retaining ring (key 58).
Slide the upper spring retainer (key 42), the relief
spring (key 41), the lower spring seat (key 43) and the
diaphragm assembly (key 55) off of the relief valve stem
(key 44).
6. Reassemble regulator in the reverse order of the
above steps.
Disassembly to Replace Valve Disk
and Orice
1. Remove the bolts (key 71, Figure 5) which hold the
lower spring casing (key 9) to the body (key 70).
Separate the lower spring casing from the body.
2. Check the body O-ring (key 21) for wear and replace
as necessary.
3. Examine the valve disk (key 36,Figure 5) for nicks,
cuts, and other damage. Remove the disk by pulling
and replace it with a new part if necessary.
4. a. If the seating edge of the Type CS200 orice
(key 25, Figure 7) is nicked or rough, remove the
orice from the body using a 7/8-inch / 22 mm
socket wrench.
b. If equipped with a Type CS205/206
Secondary Seat™ orice assembly, inspect the
primary seating surface as well as the secondary
seating surface and sealing surface. If nicks or other
damage are present, remove the orice
assembly from the body using a 7/8-inch / 22 mm
socket wrench.
Apply anti-seize lubricant to the external threads of
the new orice and reassemble.
Note
If the orice is being replaced with a
different size, change the nameplate
to state the new size and maximum
inlet pressure.
5. Reassemble the regulator in reverse order of the
above steps.
Regulator Reassembly
It is recommended that a good quality pipe thread sealant
be applied to pressure connections and ttings and a
good quality lubricant be applied to all O-rings except
when replacing key 19, as key 19 is a friction t O-ring for
holding the stem guide into the lower casing. Also apply
an anti-seize compound to the adjusting screw threads
and other areas as needed. Refer to Figures 5 through 7.
Parts Ordering
The type number, orice size, spring range, and date of
manufacture are stamped on the nameplate. Always
provide this information in any correspondence with
your local Sales Ofce regarding replacement parts or
technical assistance.
When ordering replacement parts, reference the key
number of each needed part as found in the following
parts list. Separate kit containing all recommended spare
parts is available.
Parts List
Key Description Part Number
Spare Parts (Repair Parts Kit includes keys 21,
36, 55, and 62)
Type CS200 RCS200X0012
1 Upper Case, Aluminum GE24555X012
2 Vent Screen, 18-8 Stainless steel T1121338982
3 Retaining Ring, Zinc-plated steel T1120925072
4 Stabilizer Guide, Stainless steel GE27061X012
5 Stabilizer, 1 inch / 25 mm GE27063X012
Type CS200 without Secondary Seat™
protection, Aluminum
1/8 inch / 3.1 mm 1A936709012
3/16 inch / 4.7 mm 00991209012
1/4 inch / 6.4 mm 0B042009012
3/8 inch / 9.5 mm 0B042209012
1/2 inch / 13 mm 1A928809012
Type CS205 with Secondary Seat
protection, Brass/Nitrile (NBR)
1/8 inch / 3.1 mm GE31991X012
3/16 inch / 4.7 mm GE32008X012
1/4 inch / 6.4 mm GE32010X012
5/16 inch / 7.9 mm GE32012X012
Type CS206 with Secondary Seat
protection and bleed, Brass/Nitrile (NBR)
1/8 inch / 3.1 mm GE32007X012
3/16 inch / 4.7 mm GE32009X012
1/4 inch / 6.4 mm GE32011X012
5/16 inch / 7.9 mm GE32014X012
Emerson Process Management
Regulator Technologies, Inc.
USA - Headquarters
McKinney, Texas 75070 USA
Tel: +1 800 558 5853
Outside U.S. +1 972 548 3574
Asia-Paci c
Shanghai 201206, China
Tel: +86 21 2892 9000
Europe
Bologna 40013, Italy
Tel: +39 051 419 0611
Middle East and Africa
Dubai, United Arab Emirates
Tel: +971 4811 8100
For further information visit www.emersonprocess.com/regulators
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 International LLC,
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 Regulator Technologies, Inc., 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 Regulator Technologies, Inc. product remains solely with the purchaser.
Natural Gas Technologies
Emerson Process Management
Regulator Technologies, Inc.
USA - Headquarters
McKinney, Texas 75070 USA
Tel: +1 800 558 5853
Outside U.S. +1 972 548 3574
Asia-Paci c
Singapore 128461, Singapore
Tel: +65 6770 8337
Europe
Bologna 40013, Italy
Tel: +39 051 419 0611
Chartres 28008, France
Tel: +33 2 37 33 47 00
engineering, performance, and support traditionally associated
with Fisher, Tartarini™, and Francel™ regulators. Visit
www.fishercommercialservice.com to access interactive applications.
TESCOM
Emerson Process Management
Tescom Corporation
USA - Headquarters
Elk River, Minnesota 55330-2445, USA
Tels: +1 763 241 3238
+1 800 447 1250
Europe
Selmsdorf 23923, Germany
Tel: +49 38823 31 287
Asia-Paci c
Shanghai 201206, China
Tel: +86 21 2892 9499
The distinctive swirl pattern cast into every actuator
casing uniquely identi es the regulator as part of