Emerson Fisher LS200 Series User manual

LS200 Series Direct-Operated Regulators
Table of Contents
Introduction..................................................................1
Specifications .............................................................. 2
Principle of Operation.................................................. 7
Installation ...................................................................8
Overpressure Protection.............................................. 8
Startup.........................................................................9
Adjustment ..................................................................9
Shutdown...................................................................10
Maintenance..............................................................10
Parts Ordering ........................................................... 12
Parts List....................................................................13
▲ WARNING
Failure to follow these instructions or
to properly install and maintain this
equipment could result in an explosion,
fire and/or fire 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.
Call a qualified service person to service
the unit. Installation, operation and
maintenance procedures performed
by unqualified person may result
in improper adjustment and unsafe
operation. Either condition may result in
equipment damage or personal injury.
Only a qualified person shall install or
service the regulator.
Introduction
Scope of the Manual
This manual provides specications, installation,
adjustment, maintenance instructions and parts
ordering information for the LS200 Series Regulators.
Only personnel qualied through training or experience
should install, operate and maintain this regulator. If
there are any questions concerning these instructions,
contact your local Emerson Impact Partner O󰀩ce
before proceeding.
Figure 1. LS200 Series Regulator
LS200 Series
January 2023
Instruction Manual
D104616X012

Specifications
The Specifications section lists the specifications for the LS200 Series Direct-Operated Regulators. Factory
specification is stamped on the nameplate fastened on the regulator at the factory.
Actuator Sizes
Types LS220 and LS224 (13.8 in. / 350 mm):
Medium pressure construction for outlet pressure
range of 4.35 to 10 psig / 0.3 to 0.69 bar.
Maximum operating inlet pressure of 125 psi /
8.61 bar. Medium Pressure for outlet range of 10
to 21.75 psig / 0.69 to 1.5 bar has a maximum
operating inlet up to 284 psig / 19.6 bar. The
maximum operating and emergency inlet pressure
rating is 284 psig / 19.6 bar at 100°F / 38°C(1).
Types LS250 and LS254 (10.0 in. / 255 mm):
High pressure construction for outlet
pressure range of 20 to 60 psig / 1.37 to
4.2 bar. The maximum operating inlet pressure
is 284 psig / 19.6 bar with a maximum
emergency inlet pressure of 284 psig / 19.6 bar
at 100°F / 38°C(1).
Body Sizes and End Connection Styles
See Table 3
Outlet Pressure Ranges(2)
See Table 4
Pressure Ratings(2)
See Table 4
Maximum Outlet Pressure(2)
See Table 5
Certifications
EN 334, EN 14382 and
Pressure Equipment Directive (PED)
DVGW
Up to 25% Hydrogen Blend (Pending 100%)
V9
Hydrogen Construction Available(4)
Pressure Registration
External; downstream control line is required
Temperature Capabilities(2)(3)
-20 to 150°F / -29 to 66°C
-4 to 140°F / -20 to 60°C for PED
Lockup and Function Tested to -40°F / -40°C
Control Line Connection
Without Slam-Shut:
1/4 NPT (internal); connection will be positioned
directly over body outlet (standard position)
or 90 degrees right or left of standard position
if specified.
With Slam-Shut:
1/4 NPT (internal) connection right or left directly
over slam-shut. Can be selected or changed
after shipment.
Vent Connection
3/4 NPT (internal) vent assembly.
Approximate Weight
Body
NPT: 26.5 lbs / 12 kg
2x2: 30.4 lbs / 13.5 kg
2x4: 38.7 lbs / 17.55 kg
Slam-Shut Device: 16.4 lbs / 7.45 kg
Type LS220: 61.1 lbs / 27.7 kg
(Eye nuts included)
Type LS250: 44.9 lbs / 20.35 kg
(Eye nuts included)
1. Shown at ambient temperature 100°F / 38°C. Follow applicable ange pressure/temperature code limits.
2. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
3. The lock up and function were tested to -40°F / -40°C. Flow performance was tested at ambient temperature.
4. Contact your Emerson Impact Partner or the local Emerson sales o󰀩ce for more information.
PED Categories and Fluid Group
A single LS200 Regulator without Slam-shut cannot
be used as a safety accessory according Pressure
Equipment Directive PED 2014/68/EU to protect
downstream pressure equipment.
According to EN 14382, only in integral strength type
and Class A conguration (when both over and under
pressure protections are set up), the possible built-in
safety shut-o󰀨 device can be classied like a safety
accessory according to Pressure Equipment Directive
PED 2014/68/EU.
The minimum PS between slam shut device valve
and slam-shut controller shall be the PS of the safety
accessory to comply the provisions of EN 14382 about
integral strength type.
Table 1. LS200 Series Regulators PED Category
PRODUCT SIZE CATEGORY FLUID GROUP
2 I 1
All sizes with slam shut IV
2
LS200 Series

Table 3. Body Sizes and End Connection Styles
BODY SIZE END CONNECTION STYLE
In. DN Cast iron Body Ductile iron Body WCC steel Body
2x2 50x50 NPT or CL125 FF CL150 RF or PN 16 NPT, CL150 RF or PN 16
2x4 50x100 CL125 FF CL150 RF or PN16 CL150 RF or PN 16
Table 4. LS200 Series Outlet Pressure Ranges and Control Spring Information
TYPE
ACTUATOR
DIAMETER SIZE,
in. / mm
SPRING RANGE CONTROL SPRING
PART NUMBER WIRE DIAMETER COLOR
psig bar In. mm
LS220 and
LS224 13. 8 / 350
4.35 to 5.1 0.3 to 0.35 ERAA07586A0 8.5 0.312 Light Green
4.35 to 10.6 0.3 to 0.73 ERAA07589A0 10.5 0.406 Pink
4.8 to 15.7 0.33 to 1.08 ERAA07283A0 12 0.438 Dark Blue
8.3 to 21.75 0.57 to 1.5 ERAA07283A0 12.5 0.5 Orange
LS250 and
LS254 10.0 / 255
20 to 30.3 1.38 to 2.09 ERAA07589A0 10.5 0.406 Pink
20 to 44.8 1.38 to 3.09 ERAA07592A0 12 0.438 Dark Blue
25 to 60 1.72 to 4.14 ERAA07283A0 12.5 0.5 Orange
PRESSURE TYPE LS220 TYPE LS250
psig bar psig bar
Maximum Operating Inlet Pressure <10 psi / 0.69 bar max. outlet pressure 125 8.61 - - - - - - - -
>10 psi / 0.69 bar max. outlet pressure 284 19.6 284 19.6
Maximum Emergency Inlet Pressure 284 19.6 284 19.6
Maximum Operating Outlet Pressure(1) 21.7 1.5 60 4.13
Maximum Outlet Pressure Over Outlet Pressure Setting 28.9 1.99 83.7 5.77
Maximum Emergency Outlet (Casing) Pressure 50 3.44 150 10.34
1. With highest spring range available only.
Table 5. Maximum Inlet and Outlet Pressure
Table 2. Available Configurations
TYPE NUMBER OPTION
L S 2
PRESSURE CONSTRUCTION
0 Low Pressure Applications (In Development)
2Medium Pressure Applications (Outlet Pressure: 0.3 to 1.5 bar / 4.35 to 21.75 psig)
5High Pressure Applications (Outlet Pressure: 1.38 to 4.14 bar / 20 to 60 psig)
OVERPRESSURE PROTECTION
0 Without Overpressure Protection Module
4 With Slam-shut Module(1)
1. Reference Instruction Manual D103127X012 for Type VSX8 safety slam-shut module.
Table 6. Wide Open Flow Coecients
UNIT INFORMATION FLOW COEFFICIENTS
Regulator Body Type CgC1Cv
LS200 Series
2x2 LS220 and LS250 2083 29 72
2x4 2461 33 74
2x2 LS224 and LS254
with slam shut device
2001 28 28
2x4 2304 34 67
3
LS200 Series

TYPE OUTLET RANGE BODY
MATERIAL
END
CONNECTION
TEMPERATURE RANGE MAXIMUM
OPERATING INLET
MAXIMUM BODY
PRESSURE RATING
psig bar ˚F ˚C psig bar psig bar
LS220 and
LS224 4.35 to 10 0.3 to 0.69
Ductile iron
PN 16 -20 to 100 -29 to 38
125 8.6
232 16
-20 to 150 -29 to 66
CL150 RF -20 to 100 -29 to 38 249 17.2
-20 to 150 -29 to 66 242 16.7
Steel
PN 16 -20 to 100 -29 to 38 232 16
-20 to 150 -29 to 66
CL150 RF -20 to 100 -29 to 38 284 19.6
-20 to 150 -29 to 66 271 18.7
NPT -20 to 100 -29 to 38 284 19.6
-20 to 150 -29 to 66 271 18.7
Cast iron
CL125 FF -20 to 100 -29 to 38
175 12.1
-20 to 150 -29 to 66
NPT -20 to 100 -29 to 38
-20 to 150 -29 to 66
LS220 and
LS224 10 to 21.7 0.69 to 1.5
Ductile iron
PN 16 -20 to 100 -29 to 38 232 16 232 16
-20 to 150 -29 to 66
CL150 RF -20 to 100 -29 to 38 249 17.2 249 17.2
-20 to 150 -29 to 66 242 16.7 242 16.7
Steel
PN 16 -20 to 100 -29 to 38 232 16 232 16
-20 to 150 -29 to 66
CL150 RF -20 to 100 -29 to 38 284 19.6 284 19.6
-20 to 150 -29 to 66 271 18.7 271 18.7
NPT -20 to 100 -29 to 38 284 19.6 284 19.6
-20 to 150 -29 to 66 271 18.7 271 18.7
Cast iron
CL125 FF -20 to 100 -29 to 38
175 12.1 175 12.1
-20 to 150 -29 to 66
NPT -20 to 100 -29 to 38
-20 to 150 -29 to 66
LS250 and
LS254 20 to 60 1.37 to 4.13
Ductile iron
PN 16 -20 to 100 -29 to 38 232 16 232 16
-20 to 150 -29 to 66
CL150 RF -20 to 100 -29 to 38 249 17.2 249 17.2
-20 to 150 -29 to 66 242 16.7 242 16.7
Steel
PN 16 -20 to 100 -29 to 38 232 16 232 16
-20 to 150 -29 to 66
CL150 RF -20 to 100 -29 to 38 284 19.6 284 19.6
-20 to 150 -29 to 66 271 18.7 271 18.7
NPT -20 to 100 -29 to 38 284 19.6 284 19.6
-20 to 150 -29 to 66 271 18.7 271 18.7
Cast iron
CL125 FF -20 to 100 -29 to 38
175 12.1 175 12.1
-20 to 150 -29 to 66
NPT -20 to 100 -29 to 38
-20 to 150 -29 to 66
Table 7. Pressure Ranges and Body Pressure-Temperature Ratings Without PED Certication
4
LS200 Series

TYPE OUTLET RANGE BODY
MATERIAL
END
CONNECTION
TEMPERATURE RANGE MAXIMUM
OPERATING INLET
MAXIMUM BODY
PRESSURE RATING
psig bar ˚F ˚C psig bar psig bar
LS220 and
LS224 4.35 to 10 0.3 to 0.69
Ductile iron
PN 16 -4 to 100 -20 to 38
125 8.6
232 16
-4 to 140 -20 to 60
CL150 RF -4 to 100 -20 to 38 249 17.2
-4 to 140 -20 to 60 242 16.7
Steel
PN 16 -4 to 100 -20 to 38 232 16
-4 to 140 -20 to 60
CL150 RF -4 to 100 -20 to 38 284 19.6
-4 to 140 -20 to 60 271 18.7
NPT -4 to 100 -20 to 38 284 19.6
-4 to 140 -20 to 60 271 18.7
LS220 and
LS224 10 to 21.7 0.69 to 1.5
Ductile iron
PN 16 -4 to 100 -20 to 38 232 16 232 16
-4 to 140 -20 to 60
CL150 RF -4 to 100 -20 to 38 249 17.2 249 17.2
-4 to 140 -20 to 60 242 16.7 242 16.7
Steel
PN 16 -4 to 100 -20 to 38 232 16 232 16
-4 to 140 -20 to 60
CL150 RF -4 to 100 -20 to 38 284 19.6 284 19.6
-4 to 140 -20 to 60 271 18.7 271 18.7
NPT -4 to 100 -20 to 38 284 19.6 284 19.6
-4 to 140 -20 to 60 271 18.7 271 18.7
LS250 and
LS254 20 to 60 1.37 to 4.13
Ductile iron
PN 16 -4 to 100 -20 to 38 232 16 232 16
-4 to 140 -20 to 60
CL150 RF -4 to 100 -20 to 38 249 17.2 249 17.2
-4 to 140 -20 to 60 242 16.7 242 16.7
Steel
PN 16 -4 to 100 -20 to 38 232 16 232 16
-4 to 140 -20 to 60
CL150 RF -4 to 100 -20 to 38 284 19.6 284 19.6
-4 to 140 -20 to 60 271 18.7 271 18.7
NPT -4 to 100 -20 to 38 284 19.6 284 19.6
-4 to 140 -20 to 60 271 18.7 271 18.7
Table 8. Pressure Ranges and Body Pressure-Temperature Ratings With PED Certication
Downstream equipment, protected by possible built-in
safety shut-o󰀨 device (in its Class A and integral
strength conguration) of this product, shall have
technical features such as to be category per table
below according to Pressure Equipment Directive
PED 2014/68/EU.
The regulator and built-in pressure accessories
(e.g. slam-shut controller Type VSX8) installed in
all the available sizes of LS200 Series Regulators,
conform to Pressure Equipment Directive PED
2014/68/EU Article 4 Section 3 and were designed and
manufactured in accordance with Sound Engineering
Practice (SEP).
Per Article 4 Section 3, these “SEP” products must not
bear the CE marking.
Product Description
The LS200 Series Direct-Operated Gas Regulators,
shown in Figure 1 are primarily designed for
industrial and commercial applications supplying
gas to furnaces, burners and other appliances.
The LS200 Series Balancing System enables the
regulator to provide accurate control gas pressure
for maximum combustion efficiency despite varying
inlet pressure conditions. The single port construction
provides bubble-tight shutoff.
This product has been designed to be used with fuel
gases of 1st and 2nd family according to EN 437 and
with other nonaggressive and nonfuel gases. For any
other gases, other than natural gas, please contact
your local sales agent.
5
LS200 Series

Figure 2. LS200 Series Operational Schematics
Figure 3a. LS200 Series Installation Schematic
TYPE LS220 TYPE LS250
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
5 x DN
10 x DN
6
LS200 Series
MXXXX
Type LSR
Type LSR Medium Pressure Direct-Operated Regulator
August 2022
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE

5 x DN
10 x DN
Figure 3b. LS200 Series Monitor Conguration Installation Schematic
The standard gas pressure devices (regulators
and safety shut-off devices) are those used in the
assemblies dealt with into EN 12186 and EN 12279
and their use has to be under the provisions into
ENs 12186 and 12279.
If additional pressure accessories (e.g. slam shut
controller) are needed, it is recommended to use
Emerson products.
Emerson will not be responsible for any possible
inefficiency due to installation of non-Emerson
production additional pressure accessories (e.g.
slam-shut controller).
An external downstream control line is required for
the operation of the regulator. A restriction collar is
available to reduce the flow capacity of the regulator.
Principle of Operation
Refer to the operational schematics in Figure 3. The
LS200 Series downstream pressure is registered
under the diaphragm via the external control line and
is used as the operating medium. Increased demand
lowers the downstream pressure and allows the
spring to move the diaphragm and stem assembly
down, opening the valve disk and supplying more gas
to the downstream system.
Decreased demand increases the downstream
pressure and moves the diaphragm and stem
assembly up, closing the valve disk and decreasing
the gas supply to the downstream system.
Boosting System
The LS200 Series incorporates a balancing diaphragm
and a boosting system. When the regulator is locked
up, inlet pressure is registered on the top of the disk
and on the bottom of the balancing diaphragm through
space between the stem and cage. Also, downstream
pressure is registered on the bottom of the disk and on
the top of the balancing diaphragm through a passage
in the stem.
When the trim is open, gas flows from the inlet over
the edge of the disk to the outlet. Under the disk,
there is little gas flow. The gas pressure is higher
than it is in the flow path where gas velocity tends to
lower the pressure. The higher pressure near the disk
is registered on the top of the balancing diaphragm
through the space between the stem and the cage.
This pressure registered on the top of the balancing
diaphragm aids downward disk travel and
compensates for spring and diaphragm effect. This
improves regulator rangeability and performance.
MONITOR REGULATOR
7
LS200 Series

Figure 4. Rearming Process
Installation
▲ WARNING
Personal injury, property damage,
equipment damage or leakage
due to escaping gas or bursting of
pressure-containing parts may result
if this regulator is overpressured or
installed where service conditions
could exceed the limits given in
the Specifications section or where
conditions exceed any ratings of the
adjacent piping or piping connections.
To avoid such injury or damage, provide
pressure-relieving or pressure-limiting
devices (as required by the appropriate
code, regulation or standard) to prevent
service conditions from exceeding limits.
Additionally, physical damage to the
regulator could cause personal injury or
property damage due to escaping gas.
To avoid such injury or damage, install
the regulator in a safe location.
Before installing the LS200 Series Regulator, inspect
it for shipping damage and ensure that the body and
orice are clean. Blow out the pipeline to remove pipe
scale and other foreign material.
The regulator may be installed in any position as long
as the ow through the body is the same as indicated
by the ow direction arrow on the body and the vent
opening is unobstructed and protected from the rain,
ice and other foreign material.
If the regulator has threaded end connections, coat
external threads with pipe compound. For anged end
connections, tighten the ange bolts evenly.
Parallel run with LS200 Series is recommended
to ensure continued operation during
maintenance windows.
The regulator must be protected from damage by
vehicles and other outside sources.
Overpressure Protection
The LS200 Series Regulator has an outlet pressure
rating lower than the inlet pressure rating. Some type
of overpressure protection is needed if the actual inlet
pressure exceeds the outlet pressure rating.
Maximum operating inlet pressure for the
LS200 Series Regulators is given in Table 4. All
models must be protected against inlet pressure above
their listed maximum.
Regulator operation below these emergency pressure
limitations does not preclude the possibility of damage
from external sources or from debris in the gas line.
ARMED REARMING
RESET
ARMED
TRIPPED
RESET
ARMED
TRIPPED
8
LS200 Series

The regulator should be inspected for damage after
any overpressure condition.
Reset Procedure
See Figure 4 for the rearming process. The rearm tool
is included with all LS200 Series units with slam-shut
option. If the tool is not readily available, a 17 mm
wrench can be used to rearm.
Rotate counterclockwise until the lever is pointed
down. Continue rotating past this point to rearm.
The lever should point to the Reset Point on the
cover. The lever should no longer rotate back to the
tripped position.
Downstream Control Line
▲ WARNING
Downstream control line is required for
proper operation of these regulators.
An external downstream control line must be
installed before putting the LS200 Series Regulators
in operation. Without the control line, the regulator
will remain wide open. The downstream control line
should be a pipe or tubing of at least 1/2 in. / 12.7 mm
diameter; connect it to the downstream pipe line at
least 5 to 10 pipe diameters from the regulator and in a
straight section of pipe.
The external downstream control line connection on
the LS200 Series Regulator is 1/4 NPT.
Vent
The LS200 Series vent uses a dampening assembly to
improve performance. The damper is connected to the
spring case with 1/2 NPT connection. It is screened to
prevent insects or foreign material from entering.
If a vent to the atmosphere is required for indoor
installations, remove the damper assembly and pipe
the vent to the outside.
The vent pipe should be as short as possible with
minimum number of bends or elbows. The pipe
should also have the largest practical diameter. Install
a weather and bug resistant vent assembly on the
outside end of the vent pipe.
For indoor installation that have been piped to the
outside and for outdoor installations, the vent opening
must be positioned so that water, ice and other foreign
material cannot enter the spring case. Use care not
to place the vent opening below downspouts, eaves,
doors, windows or air intakes. The vent opening
should be checked periodically to be sure that the
opening has not been plugged with foreign material.
On some installations it may be necessary to provide
additional protection from the elements.
Startup
▲ WARNING
If the downstream system is already
pressured by another regulator or by a
manual bypass, then extra precautions
must be taken when placing the
LS200 Series in service.
The outlet of the regulator must never
be subjected to pressure higher than the
inlet pressure or the balancing diaphragm
may be damaged. Also, the control line
pressure must never exceed the set point
dictated by the spring setting by more
than 3 psig / 0.21 bar or the valve seat or
diaphragm plates can be damaged.
The procedure used in putting the
regulator in service must be planned
accordingly. Pressure gauges should
always be used to monitor downstream
and control line pressures during startup.
If the downstream system is not pressured by
another regulator or by manual bypass, use the
following procedure:
1. Check to see that all appliances are turned o󰀨.
2. Slowly open the upstream shuto󰀨 valve.
3. Slowly open the downstream shuto󰀨 valve.
4. Check all connections for leaks.
5. Make nal control spring adjustments according to
the adjustment procedures.
Adjustment
▲ WARNING
To avoid personal injury, property
damage or equipment damage caused
by bursting of pressure containing
parts or explosion of accumulated
gas, never adjust the control spring to
maintain a control pressure higher than
the upper limit of the control pressure
9
LS200 Series

Table 9. Torque Requirement for Regulator Maintenance
KEY PART NUMBER DESCRIPTION SIZE TORQUE
Ft-lb N∙m
15 ERAA51785A0 Hex locknut 20 mm / 3/4 in. Socket 26 35
31 ERAA07626A0 Hex 30 mm / 1-1/4 in. Wrench 23 30
54 ERAA12336A0 Hex locknut/Nylon 20 mm / 3/4 in. Socket 26 39
34 ERAA12017A0 Torx screw - Orifice, Cage and Int Flange T20 Torx 3 3.2
21 ERAA07751A0 Travel Indicator 21 mm / 13/16 in. Socket 15 20
58 M0236660X12 Hex 3/4 NPT 14 18
17 M5009027X12 255 and 350 mm actuator - Hex cap screw 17 mm / 11/16 in Socket 18 24
22 ERAA12023A0 Hex cap screw 13 mm / 1/2 in. Socket 17 22
KEY PART NUMBER DESCRIPTION SIZE TORQUE
Ft-lb N∙m
202 GE38176X012 Hex cap screw 10 mm / 13/32 in. Socket 12 15
202 GE38176X012 Hex cap screw 10 mm / 13/32 in. Socket 6 8
228 M5011006X12 Hex socket cap screw 4 mm / 5/32 in. Hex Key 5 6
224 M5011019X12 Hex cap screw 5 mm / 3/16 in. Hex Key 8 10
216 ERAA49756A0 Hex socket set screw 2.5 mm Hex Key 3 3
Table 10. Torque Requirement for Slam-Shut Maintenance
Maintenance
This section includes instructions for disassembly
and replacement of parts. All key numbers refer to
Figures 5, 6 and 7, except where indicated. Reference
Torque Values Table 9 for specic values of each
key number.
▲ WARNING
To avoid personal injury, property
damage or equipment damage caused by
sudden release of pressure or explosion
of accumulated gas, do not attempt any
maintenance or disassembly without
rst isolating the regulator from system
pressure and relieving all internal
pressure from the regulator.
Regulators that have been disassembled
for repair must be tested for proper
operation before being returned to
service. Only parts manufactured by
Emerson should be used for repairing
Fisher™ regulators. Restart gas
utilization equipment according to normal
startup procedures.
To avoid personal injury due to the
sudden uncontrolled movement of
parts, do not loosen the diaphragm
casing cap screws (key 17 and 19) when
the control spring (key 13) has spring
range for that particular spring. If the
desired control pressure is not within
the range of the spring, install a spring
of the proper range according to the
Diaphragm and Spring Case Area
section of the maintenance procedure.
To increase the pressure setting, remove the closing
cap (key 6, Figures 5, 6 and 7) and turn the adjusting
screw (key 10) clockwise; to lower the setting, turn the
adjusting screw counterclockwise.
A pressure gauge should always be used when
adjustments are being made. Do not adjust the spring
to produce an outlet pressure setting above the limit
stamped on the nameplate, located on the casing. If
the required pressure setting is not within the range of
the spring in use, substitute with the correct spring or
a different actuator might be needed, refer to Table 4
for spring ranges and actuator sizes. When changing
the spring, also change the nameplate, located on the
casing flange, to indicate the outlet pressure range.
Shutdown
Isolate the regulator from the pressure system and
release pressure from the outlet and the control line.
Inlet pressure will then automatically be released as
the regulator opens up in response to the lowered
pressure on the diaphragm. If the unit or station
has a slam-shut, ensure the slam-shut has not
isolated pressure upstream or downstream before
beginning maintenance.
10
LS200 Series