Baker Hughes Mooney Flowgrid User manual

Mooney™
Flowgrid™Regulator
Instruction Manual (Rev.E)
Baker Hughes Data Classication : Public

i | Baker Hughes Copyright 2021 Baker Hughes Company. All rights reserved.
THESE INSTRUCTIONS PROVIDE THE CUSTOMER/OPERATOR WITH IMPORTANT PROJECT-
SPECIFIC REFERENCE INFORMATION IN ADDITION TO THE CUSTOMER/OPERATOR’S
NORMAL OPERATION AND MAINTENANCE PROCEDURES. SINCE OPERATION AND
MAINTENANCE PHILOSOPHIES VARY, BAKER HUGHES COMPANY (AND ITS SUBSIDIARIES
AND AFFILIATES) DOES NOT ATTEMPT TO DICTATE SPECIFIC PROCEDURES, BUT TO
PROVIDE BASIC LIMITATIONS AND REQUIREMENTS CREATED BY THE TYPE OF EQUIPMENT
PROVIDED.
THESE INSTRUCTIONS ASSUME THAT OPERATORS ALREADY HAVE A GENERAL
UNDERSTANDING OF THE REQUIREMENTS FOR SAFE OPERATION OF MECHANICAL AND
ELECTRICAL EQUIPMENT IN POTENTIALLY HAZARDOUS ENVIRONMENTS. THEREFORE,
THESE INSTRUCTIONS SHOULD BE INTERPRETED AND APPLIED IN CONJUNCTION WITH
THE SAFETY RULES AND REGULATIONS APPLICABLE AT THE SITE AND THE PARTICULAR
REQUIREMENTS FOR OPERATION OF OTHER EQUIPMENT AT THE SITE.
THESE INSTRUCTIONS DO NOT PURPORT TO COVER ALL DETAILS OR VARIATIONS IN
EQUIPMENT NOR TO PROVIDE FOR EVERY POSSIBLE CONTINGENCY TO BE MET IN
CONNECTION WITH INSTALLATION, OPERATION OR MAINTENANCE. SHOULD FURTHER
INFORMATION BE DESIRED OR SHOULD PARTICULAR PROBLEMS ARISE WHICH ARE NOT
COVERED SUFFICIENTLY FOR THE CUSTOMER/OPERATOR’S PURPOSES THE MATTER
SHOULD BE REFERRED TO BAKER HUGHES.
THE RIGHTS, OBLIGATIONS AND LIABILITIES OF BAKER HUGHES AND THE CUSTOMER/
OPERATOR ARE STRICTLY LIMITED TO THOSE EXPRESSLY PROVIDED IN THE CONTRACT
RELATING TO THE SUPPLY OF THE EQUIPMENT. NO ADDITIONAL REPRESENTATIONS OR
WARRANTIES BY BAKER HUGHES REGARDING THE EQUIPMENT OR ITS USE ARE GIVEN
OR IMPLIED BY THE ISSUE OF THESE INSTRUCTIONS.
THESE INSTRUCTIONS ARE FURNISHED TO THE CUSTOMER/OPERATOR SOLELY TO
ASSIST IN THE INSTALLATION, TESTING, OPERATION, AND/OR MAINTENANCE OF THE
EQUIPMENT DESCRIBED. THIS DOCUMENT SHALL NOT BE REPRODUCED IN WHOLE OR IN
PART WITHOUT THE WRITTEN APPROVAL OF BAKER HUGHES.

Mooney Flowgrid Regulator Instruction Manual | 1
Copyright 2021 Baker Hughes Company. All rights reserved.
Table of Contents
Product Description ..................................................................................................................1
Regulator Markings...................................................................................................................3
Nameplate Information..............................................................................................................3
Principles of Operation.............................................................................................................4
Hydrostatic Testing ...................................................................................................................5
Installation..................................................................................................................................6
Piping Details.............................................................................................................................8
Start-up and Operation .............................................................................................................12
Maintenance ..............................................................................................................................15
Troubleshooting ........................................................................................................................16
Scope
This manual provides installation, operation, and maintenance
instructions for the Mooney Flowgrid regulator. Instructions for
the Mooney Series 20 pilot and Mooney noise controller will be
found in a separate manual.
Product Description
The Mooney Flowgrid regulator is an easy to maintain regulator
designed to be used primarily with a self contained pilot system.
The Flowgrid regulator has several unique features that add to
its versatility such as:
• In line maintenance
• Replaceable trim
• Reversible trim parts
• Non stretching fabric reinforced diaphragm for stability and
fast response at all temperatures
• Positive spring shutoff
• Two-stage pressure drop and optional noise controller to
minimize noise and provide cavitation protection
Baker Hughes has secured global PED EN 334 certification for
its Mooney Flowgrid regulators demonstrating our commitment
to quality and safety. The certification was awarded by DVGW
(the German Technical and Scientific Association for Gas and
Water), one of the world’s most recognized industry certification
bodies and the largest gas and water industry certification
agency in Europe. Baker Hughes has also secured the following
verifications: ISO 9901, ISO 14001, CRN along with others
ensuring the safety and quality of the Mooney regulator.

2 | Baker Hughes Copyright 2021 Baker Hughes Company. All rights reserved.
Materials of Construction
Body & Spring Case ASTM A 216 WCB Carbon Steel
Spacer ASTM A 216 WCB Carbon Steel
Throttle Plate 17-4PH Stainless Steel
Diaphragm Nitrile/Nylon (Optional - Viton/
Nylon)
O-Ring & Seals Nitrile (Optional - Viton)
Bolting ASTM 193 GR B-7 or Equal
Spring 301 Stainless Steel
Table 1
3
1
4
2
56
Figure 1 - Flowgrid Parts
All Mooney Flowgrid regulators have six main parts (excluding
bolting and O-rings); the body, throttle plate, spacer, diaphragm,
main spring, and spring case. Although parts vary in size and
design, all regulators share the same principle of operation.
The body (1) is constructed with a single port (sizes less than
10”) and a dual port (sizes greater than 10”). The dual port design
can provide redundant control if equipped with dual pilots or be
used with a single pilot for maximum capacity.
The throttle plate (2) supports the diaphragm and provides a
machined surface that the diaphragm seals against for bubble
tight shutoff. Restricted capacity plates of 35%, 50%, and 75%
are available.
The spacer (3) creates a space between the throttle plate and
the diaphragm which forms a flow path inside the regulator.
Specifications
Sizes 1” - 12” (DN 25 - DN300)
Body Style Single Port 10 inch and 12 inch
Dual Ports
End Connections Screwed, Socket Weld
Flanged, Flangeless & Buttweld
Temperature -20°F to 150°F (-29°C to 66°C)
Min/Max Temperature -40°F to 175° F (-40°C to 79° C)
Maximum Operating
Differential
800 psi (55.16 bar)
Maximum Emergency
Differential
1000 psi (68.9 bar) (unless limited
by body rating)
Minimum Differential Refer to individual product
specification sheets
Cracking Differential Refer to individual product
specification sheets
Maximum Inlet
Pressure
1480 psig (102.1 bar) (limited by
flange or pilot rating)
Outlet Pressure
Range
Limited by pilot
Flow Direction Bi-Directional1
Body Taps 1/4” - 18 NPT
1 Reverse flow by changing pilot connections and reversing
spring case.
Table 2
The fabric-reinforced diaphragm (4) is the main working part
of the Flowgrid regulator. The diaphragm functions as both an
actuator and the regulator throttling element.
It is designed to provide stability, rangeability, and fast response
without stretching. It will not “take a set” and is thick for durability
and wear resistance.
The main spring (5) provides high frequency response,
proportional action for stability and a consistent minimum
differential regardless of temperature. It also provides a
positive closing force, which is important in monitor regulation
applications.
The spring case (6) is shaped to retain the main spring. It
provides a low volume cavity where loading pressure from the
pilot system is placed on top of the diaphragm to control flow
through the regulator.

Front View Back View Top View
Mooney Flowgrid Regulator Instruction Manual | 3
Copyright 2021 Baker Hughes Company. All rights reserved.
Regulator Markings
Nameplate Information
1. American National Standards Institute (ANSI) pressure class rating of the regulator.
2. Line size of body.
3. ANSI pressure class rating of the flange.
4. Indication that the regulator has been hydrostatically tested according to code requirements.
5. The serial number is stamped on the spring case, spacer1, and body.
6. The Nameplate location.
7. The flow direction is marked on the spring case (“INLET” or “OUTLET”). Proper alignment assures that the diaphragm guide on
the Spring Case is aligned toward outlet side of the regulator.
8. The % Capacity tag indicates the capacity of the throttle plate (100%, 75%, 50%, & 35%) in the regulator.
1 On all 1” regulators and 2” standard regulators the throttle plate itself is stamped.
Item Definition
Flowgrid Registered name of regulator
Blank CE marking
S/N Serial number assigned to regulator
FG Flowgrid model description
Size/Ends Line size of body and type of end
connection
ANSI Cl American National Standards
Institute pressure class
Max Inlet Maximum inlet pressure (psig)/(bar)
YR Year manufactured
Diff Min/Max
Minimum differential required
to fully open regulatorMaximum
allowable operating pressure
differential (psig)/(bar)
Max Temp Maximum operating temperature in
degrees Fahrenheit
Bolt Torq
Ft-lbs/Nm
Recommended bolt torque for
spring case in foot pounds
Table 3
Figure 2 - Regulator Markings
Figure 3 - Flowgrid Regulator Nameplate

4 | Baker Hughes Copyright 2021 Baker Hughes Company. All rights reserved.
Figure 4 - Pressure Reducing Configuration Fully Closed
Principles of Operation
Pilot Supply Pilot Sense
Connection
Restrictor
Inlet Outlet
Pilot Outlet
Connection
Pilot Loading
Connection
Pilot Supply Pilot Sense
Connection
Restrictor
Inlet Outlet
Pilot Outlet
Connection
Pilot Loading
Connection
Figure 5 - Pressure Reducing Configuration Partially Open
At no flow, when the outlet pressure is greater than the set point
of the pilot regulator, the pilot is closed and full inlet pressure
loads the spring case through the pilot loading connection. In this
condition the diaphragm is closed tightly against the throttle plate.
The pressure differential across the outlet half of the diaphragm
adds to the spring force in closing the Flowgrid regulator (Refer
to Figure 4).
As demand for flow occurs in the downstream system the
outlet pressure drops, causing the pilot regulator to open and
start bleeding pressure out of the spring case faster than it
can enter through the restrictor. Reducing the pressure above
the diaphragm allows the inlet pressure to progressively lift
the diaphragm off the throttle plate, opening the regulator and
satisfying the demand for flow in the downstream system. (Refer
to Figure 5).
Pilot Supply Pilot Sense
Connection
Restrictor
Inlet Outlet
Pilot Outlet
Connection
Pilot Loading
Connection
Figure 7 - Back Pressure Configuration Partially Open
Figure 6 - Back Pressure Configuration Fully Closed
Pilot Supply Pilot Sense
Connection
Restrictor
Inlet Outlet
Pilot Outlet
Connection
Pilot Loading
Connection
When demand for flow ceases or is reduced, the downstream
pressure increases causing the pilot regulator to close. Inlet
pressure continues to pass through the restrictor until the control
pressure equals the inlet pressure. The spring force, plus the
pressure differential across the outlet half of the diaphragm
closes the diaphragm against the throttle plate, shutting off the
flow (Refer to Figure 4).
Adjustment of the restrictor affects the response rate, stability,
and sensitivity of the regulator. Smaller restrictor openings result
in higher gain (sensitivity) and slower closing speeds. Larger
openings result in lower gain (greater proportional band), greater
stability and faster closing speeds.

Mooney Flowgrid Regulator Instruction Manual | 5
Copyright 2021 Baker Hughes Company. All rights reserved.
A back pressure regulator or relief regulator controls upstream
pressure instead of downstream pressure. The control action
in the pilot is the reverse of a pilot for a pressure reducing
regulator (increasing pressure in the sense chamber opens
the pilot regulator). At no flow, when the inlet pressure is less
than the set point of the pilot regulator, the pilot is closed and
full inlet pressure loads the spring case through the pilot loading
connection. In this condition, the diaphragm is closed tightly
against the throttle plate. The pressure differential across the
outlet half of the diaphragm adds to the spring force in closing
the Flowgrid regulator (Refer to Figure 6).
As inlet pressure increases above the set point of the pilot
regulator, it will open and start bleeding pressure out of the spring
case faster than it can enter through the restrictor. Reducing
the pressure above the diaphragm allows inlet pressure to
progressively lift the throttling element off the throttle plate
opening the regulator and satisfying the demand for flow in the
upstream system (Refer to Figure 7).
When upstream pressure decreases, causing the pilot regulator
to close, pilot supply pressure continues to pass through the
restrictor until the control pressure equals the inlet pressure. The
spring force, plus the pressure differential across the outlet half
of the throttling element closes the diaphragm against the throttle
plate, shutting off the flow (Refer to Figure 6).
Adjustment of the restrictor affects the response rate, stability,
and sensitivity of the regulator. Smaller restrictor openings result
in higher gain (sensitivity) and slower closing speeds. Larger
openings result in lower gain (greater proportional band), greater
stability and faster closing speeds.
Hydrostatic Testing
All Flowgrid regulators are hydrostatically tested at the factory
prior to shipment according to ISA-S75.19-1989 and MSS-SP-61
standards. If it is necessary to retest the regulator, follow one of
the procedures listed below to prevent damage to the diaphragm.
Option 1
1. Disconnect and remove all control line(s) and the pilot from
the Flowgrid regulator.
2. Loosen main spring case nuts in a crisscross pattern. The
main spring will lift the spring case as the nuts are removed.
3. Remove main spring and diaphragm from regulator.
For all 1”, 2”, 4”, 6” (and 10”-V6)
Flowgrid Regulators
4. Replace diaphragm with a used diaphragm that has the
thick padded area cut out leaving the outer sealing surface
(see below).
This area removed
For 3” and 4” x 3” Flowgrid
Regulators
4. Remove diaphragm but leave diaphragm O-ring in place.
Make sure O-ring is properly seated.
5. Reassemble spring case on Flowgrid regulator.
6. Tighten main bolts in increments using a crisscross pattern.
Torque bolting as indicated on regulator nameplate (or refer
to Table 6, Page 14).
7. Plug spring case loading port, pilot inlet and outlet taps on
Flowgrid regulator.
8. Refer to Table 4 for the maximum hydrostatic test pressure
of each Flowgrid regulator.
9. After hydrostatic test is completed follow the Dissassembly,
Cleaning, and Assembly procedures in the Maintenance
section of this manual
Option 2
1. Disconnect and remove all control line(s) and pilot from the
Flowgrid regulator.
2. Pipe regulator with the inlet, outlet, and loading connections
all common so that pressure is equalized in the entire
regulator during the hydrostatic test (See Figure 8).
3. Refer to Table 4 for Maximum hydrostatic test pressure of
each Flowgrid regulator.
4. After hydrostatic test is completed follow the Disassembly,
Cleaning, and Assembly procedures in the Maintenance
section of this manual.
End Connection Max. Hydrostatic Test
Pressure
Screwed & Socket Weld 2225 psi (153.41
bar)
150# Flange & Flangeless 450 psi (31.02 bar)
300# Flange & Flangeless 1125 psi (77.56 bar)
600# Flange & Flangeless 2225 psi (153.41 bar)
Flowgrid 2501 375 psi (25.86 bar)
1The Flowgrid 250 is a ductile iron construction.
Table 4 - Maximum Hydrostatic Test Pressures
Figure 8 - Flowgrid Tee Connections
A. Inlet connection on regulator body joined to “Tee”.
B. “Tee” connected to loading connection on spring case.
C. Outlet of “Tee” connected to outlet connection on regulator

6 | Baker Hughes Copyright 2021 Baker Hughes Company. All rights reserved.
Installation
1. Personnel: Installation of the Flowgrid regulator should
be made by qualified personnel familiar with high pressure
piping and pilot operated regulators.
Personal injury, equipment damage, or leakage
due to explosion of accumulated gas or bursting of
pressure containing parts, may result if this regula-
tor is overpressured, or is installed where service
conditions could exceed the limits given in the
specication of this manual, or on the nameplate, or
where conditions exceed any ratings of the adjacent
piping or piping connections. Verify the limitations
of both regulator and pilot to ensure neither device
is overpressured. To avoid such injury or damage,
provide pressure relieving or pressure limiting
devices (as required by Title 49, Part 192, of the U.S.
code of Federal Regulations, by the National Fire
Codes of the National Fire Protection Association,
or applicable codes), to prevent service conditions
from exceeding those limits. Additionally, physical
damage to the regulator/regulator could break the
pilot off the main regulator, causing personal injury
and/or property damage due to explosion of ac-
cumulated gas. To avoid such injury and damage,
install the regulator in a safe location.
2. Prior Inspection: Inspect the main regulator, pilot, and
tubing for any damage that might have occurred in shipping.
Make sure the body, pilot lines, and inlet piping are clear
and free from foreign material.
3. Orientation: The Flowgrid regulator may be installed in any
position - the best position being one that provides easiest
access for pilot adjustment and regulator maintenance.
4. Lifting: Recommended lifting points are provided with each
Mooney Flowgrid regulator. A lifting bracket is included on
the spring case of the 1-2” regulators and two eye nuts on the
3-6” regulators.When lifting Mooney Flowgrid Regulators,
the following lifting guidelines are recommended:
• Always lift from both supplied lifting points (Sizes 3” and
larger) to ensure controlled and even lifting.
• A minimum sling angle of 60° shall be used for lifting. It
is recommended that a spreader bar be used to control
lift angle when possible.
• Never use a sling as a loop between two or more lifting
eyes.
• Always verify that lifting eye nuts are tightened until the
base is flush with the top of the hex nut prior to lifting.
• Never lift regulator assemblies by NPT ports in the
body or spring case.
• Never use accessories, accessory piping or fittings to
lift or support regulator assembly.
Flowgrid Regulators may require manual or assisted
lifting. It is the end user’s responsibility to ensure
the lifting means (product lifting points or equip-
ment) is properly installed, torqued, and inspected
for use in accordance with local codes and stan-
dards. Sizes above 3” in weight and assemblies
over 40 lbs, (18kg) require the use of another person
or equipment aided lifting. When lifting or moving
equipment suitable for an individual, added care
should be taken to prevent extended or strained mo-
tion and positioning.
5. Screwed End Regulators: Apply pipe compound to the
male threads starting one or two threads back from the end
prior to assembling the joint.
6. Flanged End Regulators: Use suitable line gaskets and
good bolting practices with flanged bodies. A crisscross
pattern of incrementally tightening the line bolts is
recommended.
7. Weld End Bodies: Remove the Spring Case and all trim
parts including diaphragm and O-rings before welding
a buttweld and/or a socket weld end Flowgrid regulator.
Electric arc welding is recommended to minimize heat build-
up on the body assembly. Reassemble regulator (refer to
the Maintenance section of this manual for Disassembly and
Assembly procedures) and pressurize with air to check for
leaks prior to putting the regulator in service.
Gas Regulators installed in conned or enclosed
spaces should be provided with adequate ventila-
tion to prevent the possibility of gas buildup or
accumula- tion from leaks and venting. Leaks or
vented gas may accumulate causing personal injury,
death, or property damage. Pilot spring cases and
the regulator enclosure should be vented to a safe
area away from air intakes, or any hazardous loca-
tion. The vent lines and stacks must be protected
against condensation and clogging.
8. Pilot Supply Lines: Run a 3/8” or 1/2”pilot supply line
from the regulator body connection on the inlet side of the
Flowgrid regulator to the pilot supply Filter or directly to the
pilot Restrictor.
Note: A shutoff regulator is not required in the supply
to the pilot, but if one is installed it should be a full
opening ball regulator type.
9. A Type 30 Filter in the pilot supply line is recommended
to clean dirt and other particulates that could affect the
restrictor or variable orifice in the pilot. Use a 1/4” nipple to
mount the filter to the body tap on the Flowgrid regulator.
10. Filter Outlet: Run 3/8” tubing or 1/4” pipe from the filter
OUTLET port to the INLET side of the restrictor in the pilot
system of the regulator. The TYPE 30/30A/30S FILTER
has two OUTLET ports for ease of tubing. Block the other
port with the plug provided or mount a gage to monitor inlet
pressure if desired.

Mooney Flowgrid Regulator Instruction Manual | 7
Copyright 2021 Baker Hughes Company. All rights reserved.
Note: The Sense line (control line) connection should be
8-10 pipe diameters away from areas of turbulence (such
as regulators, reducers, and elbows) and should have a
full opening into the pipe free from burrs, drill peels, and
weld slag. Shutoff regulators are not required in the control
line(s), but if installed, they should be of the full opening
type. Gas velocity at the sense line connection should not
exceed 100 ft/sec (30m/sec).
13. Pilot Discharge: Run 3/8 inch tubing from the pilot OUTLET
port to the downstream piping or to the connection provided
on the outlet of the Flowgrid regulator as shown in the piping
schematics.
Standby Monitor Note: To ensure full capacity of a
Standby Monitor regulator station, it is important
that the pilot discharge of the upstream regulator be
connected downstream of the station if the minimum
pressure drop (across the entire station) is below 60
psig (4.13 bar) (Refer to page 9 and page 12).
14. Vent Regulators and Gauge Connections: Vent regulators
and gauge connections are recommended in the inlet and
outlet piping to the Flowgrid regulator. A gauge connection
may be installed on the loading pressure connection to
the Spring Case of the Flowgrid regulator. These would
be a great convenience during start up, maintenance, and
operation.
15. Interstage Piping (Working Monitor): Please refer to
page 10 for interstage piping and sense line connection
recommendations.
Note: To avoid galling when stainless steel to stainless
steel connections are made, use a lubricant (such
as NEVER SEEZ by Bostik). For best results, Lightly
lubricate the female threads. Mixing the lubricant with
pipe dope is also acceptable. Do not exceed more than
1/4 turn past the point the threads start to bind.
11. Pilot Gas Heaters (Optional): Pilot supply gas can be
heated to prevent the formation of ice or hydrates in the
pilot system. Pilot supply gas heaters should be connected
after the pilot filter (if one is used). Do not directly heat to
entire Flowgrid regulator to prevent freezing; internal rubber
components can be heated beyond their max temperature
rating causing potential damage.
12. Sense Lines (Control Lines): Sense lines should be run
from the pilot mounted on the Flowgrid regulator to a point
8 to 10 pipe diameters away from the regulator (Refer to
Piping Schematics). Use Table 5 as a guide for the ideal
tubing to use. Reduce as necessary to connect to the pilot.
Outlet Pressure
Pilot Regulator
with:
Less than 2 psi
(0.14 bar)
2 – 5 psi
(0.14 –
0.35 bar)
Greater than
5 psi (0.35
bar)
Static Sense
Line (No Flow)1
1/2” Pipe
minimum
1/2” Tubing 3/8” Tubing
Sense Line w/
Flow1
3/4” – 1” Pipe 1/2” Pipe 1/2” Tubing
1The Flowgrid Series 20 Pilot has a static sense line.
Table 5 - Outlet Pressure

Piping Schematics
1. Single Port Regulator (PRV)
2. Single Port Regulator (BPV)
3. Dual Port Regulator/Single Pilot/(PRV)
4. Dual Port Regulator/Single Pilot/(BPV)
5. Dual Port Regulator/Dual Pilot/(PRV).
6. Dual Port Regulator/Dual Pilot/(BPV)
7. Standby Monitor with differential greater than 60 psig
(4.13 bar)
8. Standby Monitor with differential less than 60 psig (4.13 bar)
9. Working Monitor
All drawings show installations with the Series 20 Flowgrid pilot
equipped with Type 24 restricting regulator & Type 30 Filter.
Consult factory for installation schematics of other manufacturer’s
pilot on the Flowgrid regulator.
8 | Baker Hughes Copyright 2021 Baker Hughes Company. All rights reserved.
1. Single Regulator/Single Pilot
(Pressure Reducing Regulator)
1. Filter supply connected from inlet connection on regulator body to Type 30 Filter inlet.
2. Pilot supply from outlet connection on Type 30 Filter to Type 24 Restrictor inlet.
3. Type 24 Restrictor mounted to Inlet port of Series 20 Pilot.
4. Loading Port of Series 20 Pilot connected to Loading connection on Spring Case of Flowgrid regulator.
5. Sense line connecting Sense port on Series 20 Pilot to upstream (BPV) or downstream (PRV) piping.
6. Outlet port of Series 20 Pilot connected to Outlet connection of Flowgrid regulator.
7. Pilot cartridge in PRV mode (pressure reducing) BPV (back pressure/relief) mode.
2. Single Regulator/Single Pilot
(Back Pressure Regulator)

Piping Schematics (cont.)
3. Dual Port/Single Pilot (Pressure Reducing Regulator) 4. Dual Port/Single Pilot (Back Pressure Regulator)
5. Dual Port/Dual Pilot (Pressure Reducing Regulator)
Note: The dual port regulator offers redundant control with
two separate control loops. Ports #1 & #2 are piped identi-
cally.
6. Dual Port/Dual Pilot (Back Pressure Regulator)
Mooney Flowgrid Regulator Instruction Manual | 9
Copyright 2021 Baker Hughes Company. All rights reserved.
1. Filter supply connected from inlet connection on regulator
body to Type 30 Filter inlet.
2. Pilot supply from outlet connection on Type 30 Filter to Type
24 Restrictor inlet.
3. Type 24 Restrictor mounted to “Tee” connection.
3A. Type 24 Restrictor mounted to Inlet port of Series 20 Pilot.
4. Tee mounted to Inlet Port of Series 20 Pilot.
5. Loading Port of Series 20 Pilot connected to Loading
connection on Spring Case (Port #1) of Flowgrid Regulator.
6. From “Tee” to Spring Case (Port #2) of Flowgrid regulator.
7. Outlet port of Series 20 Pilot connected to Outlet connection
of Flowgrid regulator.
8. Sense line connecting Sense port on Series 20 Pilot to
downstream (PRV) or upstream (BPV) piping
9. Pilot cartridge in PRV mode (pressure reducing) BPV (back
pressure/relief) mode.
Note: Dual port regulators in 1” - 8” sizes have been
discontinued. Schematics for reference only.

Piping Schematics (cont.)
7. Standby Monitor with Differential Pressure Greater than 60 psi (4.13 bar)
Operating Regulator
Monitor Regulator
8. Standby Monitor with Differential Pressure Less than 60 psi (4.13 bar)
Operating Regulator
Monitor Regulator
10 | Baker Hughes Copyright 2021 Baker Hughes Company. All rights reserved.
1. Filter supply connected from inlet connection on regulator
body to Type 30 Filter inlet.
2. Pilot supply from outlet connection on Type 30 Filter to Type
24 Restrictor inlet.
3. Type 24 Restrictor mounted to Inlet port of Series 20 Pilot.
4. Loading Port of Series 20 Pilot connected to Loading
connection on Spring Case of Flowgrid regulator.
5. Sense line connecting Sense port on Series 20 Pilot to
downstream piping.
6. Outlet port of Series 20 Pilot connected to Outlet connection
of Flowgrid regulator.
6A. Outlet port of Series 20 Pilot connected to downstream
piping.
7. Pilot cartridge in PRV mode.
8. Pilot supply from inlet connection on regulator body to Type
30 Filter inlet.
9. Pilot supply from outlet connection on Type 30 Filter to Type
24 Restrictor inlet.
10. Type 24 Restrictor mounted to Inlet port of Series 20 Pilot.
11. Loading Port of Series 20 Pilot connected to Loading
connection on Spring Case of Flowgrid regulator.
12. Sense line connecting Sense port on Series 20 Pilot to
downstream piping.
13. Outlet port of Series 20 Pilot connected to Outlet connection
of Flowgrid regulator.
14. Pilot cartridge in PRV mode.

2nd Stage Regulator
1st Stage Regulator
Pilot #1
Pilot #2
Mooney Flowgrid Regulator Instruction Manual | 11
Copyright 2021 Baker Hughes Company. All rights reserved.
1st Stage Regulator
1. Filter supply connected from inlet connection on regulator body to Type 30 Filter inlet.
2. Pilot supply from outlet connection on Type 30 Filter to Type 24 Restrictor inlet.
3. Type 24 Restrictor mounted to Inlet port of Series 20 Pilot (#1).
4. Loading Port of Series 20 Pilot (#1) connected to Loading connection on Spring Case of the Flowgrid regulator.
5. Outlet port of Series 20 Pilot (#1) connected to Inlet port of the monitor Series 20 Pilot (#2).
6. Sense line connecting sense port on Series 20 Pilot to interstage piping.
7. Sense line connecting sense port on the monitor Series 20 Pilot (#2) to downstream piping.
8. Outlet port of Series 20 Pilot (#2) connected to Outlet connection of Flowgrid regulator.
9. Loading port on the monitor Series 20 pilot (#2) is plugged.
10. Pilot cartridges in PRV mode.
2nd Stage Regulator
11. Filter supply connected from inlet connection on regulator body to Type 30 Filter inlet.
12. Pilot supply from outlet connection on Type 30 Filter to Type 24 Restrictor inlet.
11. Pilot supply tubing from inlet connection on regulator body to Type 24 Restrictor inlet.
13. Type 24 Restrictor mounted to Inlet port of Series 20 Pilot (#3).
14. Loading Port of Series 20 Pilot (#3) connected to Loading connection on Spring Case of the Flowgrid regulator.
15. Outlet port of Series 20 Pilot (#3) connected to Outlet connection of Flowgrid regulator.
16. Sense line connecting Sense port on Series 20 Pilot (#3) to downstream piping.
17. Pilot (#3) cartridge in PRV mode.
Note: In a working Monitor system with less than 25 psig (1.72 bar) differential across the second stage regulator the pilot
supply (11) may be connected to the piping upstream of the first stage regulator. This will improve the shutoff of the second
stage regulator.
Piping Schematics (cont.)
9. Working Monitor (Refer to schematic on page 13)
General recommendations: To reduce the adverse effects on the
sense signal due to high gas velocity and turbulence:
Pipeline diameters may need to be increased in pipe sections
containing sense connections.
Gas velocity should be less than 100 ft/sec (30m/sec).
Sense connections should be 8-10 pipeline diamters away from
turbulent areas.
Follow EN12186 piping specification.

12 | Baker Hughes Copyright 2021 Baker Hughes Company. All rights reserved.
Start-up and Operation
The following procedures are suggested for start up of the
Flowgrid regulator. Start up of the Flowgrid regulator should be
made by qualified personnel familiar with high pressure systems
and pilot operated regulators.
The instruction manual for the PILOT(S) being used
should be consulted to ensure that the installation
and start up instructions for the pilot are followed.
Some pilots can be damaged if not installed and put
into operation correctly.
Pressure Reducing Regulator
1. Adjust the pilot restrictor to an intermediate opening (a “4”
setting on the Mooney Type 24 Restrictor).
2. Back off on the pilot adjusting screw to fully relieve all the
spring compression.
3. If installed, open hand regulator(s) in the control line(s), and
the pilot supply line.
4. Slightly open downstream block regulator or open vent in
piping downstream of the Flowgrid regulator.
5. Slowly open the upstream block regulator to pressurize the
Flowgrid regulator and pilot system. The Flowgrid regulator
should lock up (shut off) with zero pressure downstream.
6. Use vent in the downstream piping or slowly open the outlet
block regulators.
7. Slowly increase the pilot spring setting until some flow is
achieved through vent or into downstream system. Adjust
the pilot restrictor for stability and performance as follows:
a. If the system is stable, adjust the pilot restrictor to a
more closed position (towards MIN setting). Change
the flow rate or increase the pilot setting to check the
operation of the system during an upset.
b. If the system is stable, repeat step (a) until the system
is unstable (oscillating).
c. Now readjust the restriction to a more open position
(towards MAX setting) where the system is stable.
d. Vary the flow rate over as wide a range as possible
to make sure the system will be stable under all flow
conditions.
Note: Adjustment of the restrictor affects the
response rate, stability, and sensitivity of the
regulator. CLOSING the pilot restrictor (moving
adjustment towards MIN setting) will result in
higher gain (narrow the proportional band), more
sensitivity, and slower closing speeds. OPENING
the pilot restrictor (moving the adjustment towards
MAX setting) will result in less gain (widen the
proportional band), less sensitivity, and faster
closing speeds.
8. Slowly increase the pilot spring setting until the desired
downstream pressure is achieved.
9. Slowly close the downstream block regulator or vent to
check the Flowgrid regulator for lockup (shut off).
10. Slowly open the downstream block regulator. to begin
normal operation
Back Pressure Regulator or Relief
Regulator
1. Adjust the pilot restrictor to an intermediate opening (a “4”
setting on the Mooney Type 24 Restrictor).
2. Increase pilot spring compression to maximum or some
margin above desired setting.
3. If installed, open hand regulators(s) in the control line(s),
and the pilot supply line.
4. Check that the Flowgrid regulator is vented to atmosphere
or the downstream system is ready to accept flow.
5. Open the downstream block regulator or open vent in piping
downstream of the Flowgrid regulator.
6. Slowly open the upstream block regulator to pressurize the
Flowgrid regulator and pilot system.
The Flowgrid regulator should lock up (shut off) with zero
pressure downstream.
7. Slowly decrease the pilot spring setting until some flow is
achieved. The flow may only be through the pilot system.
8. Adjust the pilot restrictor for stability and performance as
follows:
a. If the system is stable, adjust the pilot restrictor to a
more closed position (towards MIN setting). Change
the flow rate or increase the pilot setting to check the
operation of the system during an upset.
b. If the system is stable, repeat step (a) until the system
is unstable (oscillating).
c. Now readjust the restriction to a more open position
(towards MAX setting) where the system is stable.
d. Vary the flow rate over as wide a range as possible
to make sure the system will be stable under all flow
conditions.
Note: Adjustment of the restrictor affects the
response rate, stability, and sensitivity of the
regulator.
CLOSING the pilot restrictor (moving adjustment
towards MIN setting) will result in higher gain (narrow
the proportional band), more sensitivity, and slower
closing speeds. OPENING the pilot restrictor (moving
the adjustment towards MAX setting) will result in less
gain (widen the proportional band), less sensitivity, and
faster closing speeds.
9. Slowly adjust the pilot spring setting until the desired
upstream pressure (relief setting) is achieved.

Mooney Flowgrid Regulator Instruction Manual | 13
Copyright 2021 Baker Hughes Company. All rights reserved.
Standby Monitor
Note: This procedure is based on the 1st Regulator being
the operating regulator and the 2nd regulator being the
monitor regulator.
1. Set operating pilot (#1) spring at the MAXIMUM setting.
2. Set monitor pilot (#2) spring to the MINIMUM (zero) setting.
3. Purge station and open outlet regulator or vent to allow flow
through the station
4. Slowly open inlet block regulator. Full inlet pressure should
be present at the Monitor Regulator and the Monitor
Regulator should be closed.
5. Increase the pilot spring setting of the Monitor Regulator
until the desired monitor override setting is reached. Lock in
pilot setting.
6. With some flow going through the station, begin to lower the
operating pilot setting of the Operating Regulator until the
desired outlet pressure is achieved.
Note: When the set point of the Operating Regulator
becomes less than the set point of the Monitor regulator,
the interstage pressure will drop from approximately
full inlet pressure to 5-10 psi (0.35 - 0.68 bar) above the
outlet pressure at low flow rates.
Checking Standby Monitor Operation
1. With flow going through the station, slowly increase the
setting of the Operating Regulator. When the pressure
reaches the setpoint of the Monitor Regulator, the monitor
should take control and the interstage pressure should
increase to almost full inlet pressure.
2. Reduce the setting of the Operating Regulator back to the
required outlet pressure. The interstage pressure should
drop to 5-10 psi (0.35 - 0.68 bar) above the outlet pressure
as the Operating Regulator takes control.
Note: When the differential across the entire station (P1-
P2) is less than 60 psig (4.13 bar) then alternate outlet
piping as shown below, is recommended for added
station capacity. This applies to the Series 20 Pilot only;
consult with Baker Hughes for applicability to other
manufacturer’s pilots.
Figure 9 - Standby Monitor Schematic

14 | Baker Hughes Copyright 2021 Baker Hughes Company. All rights reserved.
Standby Monitor
Working Monitor
1. Purge station and open outlet regulator or vent to allow flow
through the station.
2. Set pilot (#3) to a high setting above desired setpoint.
3. Set pilot (#1) to a high setting above desired setpoint.
4. Set the Monitor pilot (#2) at a zero setting.
5. Set restrictor on Pilot (#1) at an intermediate opening (a “4”
setting on the Mooney Type 24 Restrictor).
6. Slowly open the inlet block regulator to station. The 1st
Stage Regulator should remain closed as a result of the
Monitor Pilot (#2) being set to zero.
7. Increase the setting of the Monitor Pilot (#2) to the desired
pressure setting. If the regulator is unstable, increase the
restrictor opening until it becomes stable.
8. Lower the setpoint of the 2nd stage regulator (Pilot #3) to
the desired outlet pressure setting. Tune the restrictor on
Pilot (#3) at this time. The 1st stage regulator should open
or begin to control the interstage pressure at the setpoint of
Pilot (#1).
9. Adjust the setpoint of Pilot (#1) to achieve the desired
Interstage pressure. Tune the restrictor on Pilot (#1) at this
time.
10. Raise the setpoint of Pilot (#3) to verify the setpoint of the
Monitor Pilot (#2). Adjust if necessary. Check for system
stability and adjust the restrictor on Pilot (#1) if required.
11. Return setpoint of Pilot (#3) to maintain the desired outlet
pressure.
Figure 10 - Working Monitor Schematic
Note: In a working Monitor system with less than 25 psig (1.72 bar) differential across the second stage regulator the pilot
supply may be connected to the piping upstream of the first stage regulator. This will improve the shutoff of the second stage
regulator.

Mooney Flowgrid Regulator Instruction Manual | 15
Copyright 2021 Baker Hughes Company. All rights reserved.
Maintenance
Regulator parts are subject to normal wear and must be inspected
and replaced as necessary. The frequency of inspection and
replacement of parts depends on severity of service conditions
or the requirements of local, state, and federal regulations. Be
certain that the name plates are updated to accurately indicate
any field changes in equipment, materials, service conditions, or
pressure settings.
Before disassembly make sure the regulator has been isolated
from the process by closing block regulators on the inlet and
outlet sides of the regulator. Safely release pressure and process
fluid from body and pilot system. Failure to complete these steps
can result in personal injury and property damage.
Assembly
1. Disconnect control lines(s) and pilot supply line from pilot
system.
2. Loosen main spring case nuts in a crisscross pattern. The
main spring will lift the spring case as the nuts are removed.
3. Remove spring, diaphragm/throttling element, spacer,
throttle plate and O-rings in that order.
4. Inspect all parts for wear and damage. Replace as
necessary.
Note: The periphery of the downstream (outlet) portion
of the throttling plate is the primary shutoff surface and
should be inspected most closely for wear and damage.
Nicks and/or wear on the support ribs will usually not
affect shutoff.
The outside “rib” on the downstream side of the throttle plate is
where shutoff takes place in the Flowgrid Regulator.
Note: Nitrile O-rings can swell after disassembly of a
regulator that has been in service (due to gas permeating
the nitrile rubber). This does not necessarily mean they
must be replaced. Set O-ring aside for several hours and it
will gradually return to normal size. Placing the O-ring(s) on
ice will speed the process considerably. Before placing the
O-ring back into service inspect for defects.
Cleaning
1. DO NOT clean O-ring grooves with sharp metal tools. The
bottom of the groove must have a smooth finish to prevent
leakage. The mating surface of adjacent parts must also be
smooth to prevent leakage.
Assembly
Note: Do not lubricate diaphragm sealing surface.
1. Reassemble parts on the body per the assembly drawing in
the parts supplement for the particular regulator size.
Note: Both the throttle plate and the diaphragm can
be rotated 180 degrees (not turned upside down) to
renew the shutoff capability if the inlet side is in better
condition than the outlet.
2. Tighten main bolts in increments using a crisscross pattern.
Torque bolting as indicated on regulator nameplate (or refer
to Table 6).
Bolting Torque Values
Clean Dry Bolts- Non-Lubricated
Regulator Size Min. Torque Ft/Lbs
(n-m)
Flowgrid 250 20 (27.09)
1” (ALL)125 (33.86)
2’ x 1” (ALL)125 (33.86)
2” (ALL)160 (81.26)
3” (ALL)1125 (169.28)
4” x 3” (ALL)1125 (169.28)
4” (ALL) 1125 (169.28)
6” CL 150 & CL 300 Flanged 125 (169.28)
6” CL 600 Flanged 200 (270.86)
10” CL 150 & CL 300 Flanged 125 (169.28)
10” CL 600 Flanged 200 (270.86)
12” CL 150 & CL 300 Flanged 125 (169.28)
12” CL 600 Flanged 200 (270.86)
All Flowgrid Pilots 10 (13.54)
1Refer to WARNING below.
Table 6
Overtightening the bolting can damage the dia-
phragm in the 1” and 2” sizes of the Flowgrid
regulator.
DO NOT replace the studs or nuts with any bolt or
stud and nut combination that does NOT have an
SAE Grade 7 or ASTM Grade B7 rating.
3. Reconnect the pilot system. Follow Start up procedures
when returning to operation.

16 | Baker Hughes Copyright 2021 Baker Hughes Company. All rights reserved.
Troubleshooting
First Steps
1. Verify the regulator specifications fit the application
conditions.
Min/max inlet pressure, control pressure range & min/max
operating differentials should be checked to make sure the
regulator and pilot are designed to operate in the present
conditions.
2. Verify the regulator is piped correctly.
Even though the regulator may have operated in the
past, check that current piping connections match
recommendations on pages 7-10.
3. Verify the regulator is sized correctly.
Regulators operating below 10% or above 80% of their
maximum capacity given current application conditions tend
to have more problems. Consider reduced capacity trim or a
larger regulator in these cases.
Potential Issues
Regulator does not shut off.
1. Refer to the failure mode chart to diagnose potential causes.
2. Clean or replace regulator and pilot components as
necessary.
Erratic Control.
1. Check for damage, debris in the restrictor and control pilot.
Replace, clean and lubricate components as necessary.
Consider pilot supply filtration (Type 30 Filter).
2. Check for the potential of hydrate formation or freezing
liquids in the pilot system. If liquids are present consider gas
conditioning before the pilot and/or regulator, heating the
supply gas to the regulator, or heating the pilot supply gas
(pilot gas heater).
3. Check the sense line location and assure it is away from
turbulent locations. Moving the sense line to a new location
often solves control problems.
4. Check to make sure needle regulators are not used on any
pilot system connections. Full opening type such as ball
regulators are recommended.
5. Check for pilot vent port blockage.
Instability & Speed of response issues.
1. Change restrictor setting. Refer to page 11.
2. Check the sense line location and assure it is away from
turbulent locations. Moving the sense line to a new location
often solves control problems. Factory recommendation is
8-10 pipe diameters away from sources of turbulence such
as tee’s, elbows, reducers, regulators, etc.
3. Check to make sure needle regulators are not used on any
pilot system connections. Full opening type regulators are
recommended.
4. Check for pilot vent port blockage.
The regulator will not regulate to set point or “droops-off”.
1. Check for proper sizing. The regulator may be running out of
capacity during peak demand periods.
2. Adjust the restrictor to a higher gain (smaller) setting. Refer
to page 11.
The regulator fails open or fails closed.
1. Refer to the table below to diagnose failure modes.
Problem
Failure Mode
Fail
Open
Fail
Closed
Damage to the flexible element X X
Damage to the flexible element on the
upstream side (less likely)
X
Damage to the flexible element on the
downstream side (more likely)
X
Debris between the flexible element and
the seat
X
Blockage of pilot supply pressure X
Blockage1of the restrictor X
Blockage1of the pilot supply line X
Loss of the sense line (PRV pilot) X
Loss of the sense line (Relief Pilot) X
Blockage1of pilot discharge X
Pilot diaphragm rupture if (PRV pilot) X
Pilot diaphragm rupture if (BPV relief pilot) X
Blockage1of pilot orifice X
1 Blockage can be caused by debris, hydrates, freezing or dam-
age to the component involved.
Table 7

Mooney Flowgrid Regulator Instruction Manual | 17
Copyright 2021 Baker Hughes Company. All rights reserved.
Notes

Tech Field Support & Warranty:
Phone: [phone]
valvesuppor[email protected]
bakerhughes.com
Copyright 2021 Baker Hughes Company. All rights reserved. Baker Hughes provides this information on an
“as is” basis for general information purposes. Baker Hughes does not make any representation as to the
accuracy or completeness of the information and makes no warranties of any kind, specic, implied or oral,
to the fullest extent permissible by law, including those of merchantability and tness for a particular purpose
or use. Baker Hughes hereby disclaims any and all liability for any direct, indirect, consequential or special
damages, claims for lost prots, or third party claims arising from the use of the information, whether a claim
is asserted in contract, tort, or otherwise. Baker Hughes reserves the right to make changes in specications
and features shown herein, or discontinue the product described at any time without notice or obligation.
Contact your Baker Hughes representative for the most current information. The Baker Hughes logo,
Flowgrid and Mooney are trademarks of Baker Hughes Company. Other company names and product names
used in this document are the registered trademarks or trademarks of their respective owners.
BHMY-Flowgrid-IOM-19583E-0221 02/2021
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