Baker Hughes Masoneilan 535V-50 Series User manual

Masoneilan™
535V Reducing and 535V-50
Differential Pressure Regulators
(Microflow Regulator)
Instruction Manual (Rev. A)
Baker Hughes Data Classification : Public

© 2021 Baker Hughes Company. All rights reserved.2 | Baker Hughes
DISCLAIMER
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.

Masoneilan 535V Reducing and 535V-50 Di󰀨erential Pressure Regulators Manual | 3© 2021 Baker Hughes Company. All rights reserved.
Safety Information
Important –
Please read before installation
These instructions contain DANGER, WARNING, and
CAUTION labels, where necessary, to alert you to safety related
or other important information. Read the instructions carefully
before installing and maintaining your regulator. DANGER
and WARNING hazards are related to personal injury.
CAUTION hazards involve equipment or property damage. Operation
of damaged equipment can, under certain operational
conditions, result in degraded process system performance
that can lead to injury or death. Total compliance with all
DANGER, WARNING, and CAUTION notices is required for safe
operation.
This is the safety alert symbol. It alerts you to potential personal
injury hazards. Obey all safety messages that follow this symbol to
avoid possible injury or death.
Indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury.
Indicates a potentially hazardous situation which, if not avoided,
could result in serious injury.
Indicates a potentially hazardous situation which, if not avoided,
could result in minor or moderate injury.
When used without the safety alert symbol, indicates a potentially
hazardous situation which, if not avoided, could result in property
damage.
Note: Indicates important facts and conditions.
About this Manual
• The information in this manual is subject to change without
prior notice.
• The information contained in this manual, in whole or part, shall
not be transcribed or copied without Baker Hughes’s written
permission.
• Please report any errors or questions about the information in this
manual to your local supplier.
• These two models are the “Microow” range of the 500 Series
Regulators.
• These instructions are written specically for the Masoneilan
Models 535V Reducing and Models 535V-50 Di󰀨erential
Pressure Regulators, and do not apply for other regulators
outside of this product line.
• These two models are the “Microow” range of the Masoneilan
500 Series regulators.
• Refer to Instructions No 31593 for connecting, adjustment and
maintenance of the Masoneilan 10900 Series actuators equipping
the 500 Series regulators.
Useful Life
The current estimated useful life period for the Masoneilan
r e g u l a t o r s m o d e l s 535V and 535V-50 is 25+ years. To
maximize the useful life of the product, it is essential to conduct
annual inspections, routine maintenance and ensure proper
installation to avoid any unintended stresses on the product. The
specic operating conditions will also impact the useful life of the
product. Consult the factory for guidance on specic applications if
required prior to installation.
Spare parts
When performing maintenance, always use Masoneilan
replacement parts. Parts are obtainable through your local Baker
Hughes Representative or Spare Parts Department. When
ordering parts, always include Masoneilan Model and serial
numbers shown on serial plate.
After sales Department
Baker Hughes has a highly skilled After Sales Department
available for start-up, maintenance and repair of our regulators
and components parts. Contact the nearest Masoneilan Sales
O󰀩ce or Representative.
Training
Baker Hughes regularly holds training seminars for technicians in
its factory. Please contact your local Masoneilan Representative
or our Training Department.
Note: Care must be exercised when unpacking the regulator
to prevent damage. Should any problems arise, contact After
Sales Department. Be sure to include Masoneilan Serial and
Model numbers in all correspondence.
Warranty
Items sold by Baker Hughes are warranted to be free from defects in
materials and workmanship for a period of one year from the date
of shipment, provided said items are used according to Baker Hughes
recommended usages. Baker Hughes reserves the right to
discontinue manufacture of any product or change product materials,
design or specications without notice.
Note: Prior to installation
The regulator must be installed, put into service and
maintained by qualied and competent professionals who
have undergone suitable training.
All surrounding pipelines must be thoroughly ushed to
ensure all entrained debris has been removed from the
system.
Under certain operating conditions, the use of damaged
equipment could cause a degradation of the performance of
the system which may lead to personal injury or death.
Changes to specications, structure, and components used
may not lead to the revision of this manual unless such
changes aect the function and performance of the product.

© 2021 Baker Hughes Company. All rights reserved.4 | Baker Hughes
Description-Operation
535V Regulators
The 535V Direct Operated Regulators are designed to
maintain a uniform reduced pressure. Microow bodies of
regulators are o󰀨ered in single seat type.
Operation
The adjustable spring is set for the desired controlled
pressure. This spring holds the plug open. An increase in
controlled pressure above the set point causes regulators to
close.
Variations in the controlled pressure thus cause the necessary
regulators movement to restore the controlled pressure to set
point.
535V-50 Regulators
Masoneilan 535V-50 Series Di󰀨erential Pressure Regulators
are designed for maintaining one pressure in excess of
another (reference) pressure by an adjustable amount.
Microow bodies of regulators are o󰀨ered in single seat type.
Operation
The adjustable spring of actuator is set for the desired
di󰀨erential pressure. This spring holds the regulator open. An
increase in di󰀨erential above the set point causes the 535V-50
regulators to close.
Variations in the di󰀨erential pressure thus cause the necessary
regulator movement to restore the controlled pressure to set
point.
Plug and seat ring combination (trim)
Eight plugs and ve seat rings can be used in combination to
obtain ten di󰀨erent plug and seat ring assemblies (See Figure 2).
Each plug design and the seat ring orice diameter permit to
identify parts in relation to Figure 2.
The four plugs corresponding to trim Nos 6 to 9 di󰀨er by the
angle of the at, machined on the point. The same seat ring
(3e) and the same spacer (3f) are used in the four cases.
See Figure 2 to select the plug and seat ring combination to
obtain the required Cv.
Installation
Before installing, blow out line thoroughly to remove all foreign
matter which might foul the regulator.
Place the regulator vertically in a horizontal run of pipe so that
the controlled uid will ow through the body in the direction
indicated by the arrow on the body or the words “IN & OUT”
marked on the connections. On steam service, the regulator
should be installed with the diaphragm chamber down so that
the diaphragm will be protected by a water seal. If installed
otherwise, an adequate water seal or seals must be provided.
A three valve by-pass around the regulators permits removing
the regulator from the line without shutting o󰀨 the ow.
See Figure 1 for typical installation diagrams.
On 535V Regulators
Pipe the controlled pressure from a convenient point in the line
6-10 feet (1,8 to 3 m) from the regulator (or in the discharge
line, 6-10 feet from the pump on pump pressure applications),
to the 1/2” NPT connection in the diaphragm case.
Install a gauge and a needle valve in the controlled pressure
line, to protect diaphragm case against any over- pressure.
Needle valve permits shutting o󰀨 the control line and also
serves as an adjustable choke to prevent cycling of the
regulator, which may result from the pulsation of a pump in the
system.
On 535V-50 Regulators
Pipe the higher pressure uid from a convenient point to the
1/2” NPT connection in the upper diaphragm case (i.e., to
diaphragm chamber where pressure will oppose the spring).
Pipe the lower pressure uid to the diaphragm chamber.
Install a needle valve and gauge in each of these control lines,
su󰀩ciently near each other so that both valves can be reached
simultaneously.
Needle valves permit shutting o󰀨 both control lines and may
be used as adjustable chokes to prevent cycling of the
regulator as a result of pump pulsations. By adjusting both
valves simultaneously, accidental over-pressuring either side
of the diaphragm can be avoided.
Pressure must be increased on both sides of
the diaphragm at the same time in order to avoid
diaphragm failure.
CAUTION
CAUTION
WARNING
DANGER
Tests have been performed at the factory to check
correct operation of the regulator on its full nominal
spring range. After that, the spring compression has
been fully removed to avoid unnecessary stress of
parts (diaphragm, spring) during storage.
THEREFORE IT IS NECESSARY TO PROCEED WITH
ADJUSTMENT BEFORE SERVICING.

Masoneilan 535V Reducing and 535V-50 Di󰀨erential Pressure Regulators Manual | 5© 2021 Baker Hughes Company. All rights reserved.
Figure 2 - Ten plug and seat ring assemblies (Trim)
535V Reducing
Regulator
535V-50 Di󰀨erential
Pressure Regulator
Needle Valve
Vent Valves
Low Pressure Needle Valve
Equalizing Valve
High Pressure Needle
Valve
Figure 1 - Typical Installation

© 2021 Baker Hughes Company. All rights reserved.6 | Baker Hughes
Maintenance
If there is excessive leakage through the regulator when it is
shut o󰀨, the cause may be:
1. Foreign matter holding valve o󰀨 seat : disassemble and
clean.
2. Normal wear of seating surfaces : disassemble and replace
plug and/or seat ring.
3. Seat ring gasket (2) damaging (except with trim for Cvmax.
3.8) : replace gasket.
Disassembly (Figure 3)
• Disconnect the control line(s) at the diaphragm case.
• Remove the two packing ange nuts (8b). Raise packing
ange (10) up the plug stem and remove the two nuts (8a)
as well as the two mounting screws (16).
• By means of two at spanners, unlock the plug stem nuts
(27) and unscrew them to the threaded end of the plug stem
(12 or 183). Tighten nuts in this position.
• Fasten the actuator to a hoisting gear and very slowly pull
out the actuator-plug S/A.
• With a at spanner applied on the nuts (27), unscrew the
plug stem from the actuator stem while pulling out vertically
and slowly the actuator. Carry on until plug stem is fully
unscrewed from actuator stem.
• Separate actuator and packing ange (10) from the body
S/A.
• Remove two nuts (27) and packing follower (9) from the
plug stem.
• Using a packing hook, remove the largest number of
packing rings (6) from packing box. Remove safety pin (11)
and pull plug stem to remove packing spacer (5) and the
remainder of packing rings.
• Using a 9/16” or 14 mm piece of hex stock and a wrench,
unlock and pull out seat ring retainer (4).
• Pull out seat ring (3) and gasket (2) using a hook made from
steel wire, diameter about 3 mm. Carefully fettle the hook
end.
Note: The seat ring with Cv< 0.10 consists of two parts: The
seat ring proper (3e) and a spacer (3f). The small size of
orice of these parts does not allow for their removal by means
of a hook. Therefore, it is necessary to remove the body from
the pipe, turn it over and, if needed, to hit the bottom with a
wooden mallet. Should the seat ring be jammed in its housing,
it is possible to move it using a screwdriver inserted through
the outlet orice.
Reassembly and Plug Stem Adjustment
(Figures 3, 4, and 5)
Before reassembly, thoroughly clean the inside of the valve
body and parts. Mating surfaces must be thoroughly cleaned.
On reassembly, new seat ring gasket (2) and new packing (6)
must be used.
• Place a new seat ring gasket (2) in the valve body (13) and
install the seat ring (3) taking care to correctly center the
gasket on the seat ring shoulder. Orient it in such a manner
that one of its ports lines up with the body outlet orice.
Note: For a Cvsmaller than 0.10, the seat ring (3e) shall
rst be positioned on the new gasket (2) taking the same
precautions as shown above. Next, engage spacer (3f) and
orient one of its ports towards the body outlet orice.
Regulator with Cv3.8 does not feature any seat ring gasket (2).
• Carefully apply Never Seez grease (or equivalent) to
threads and bottom of retainer (4). With a 9/16” or 14 mm
piece of hex stock and a wrench, torque the retainer to 59
ft-lbs (8 daN.m) if a graphite gasket st. st. reinforced, or to
40 ft-lbs (5,5 daN.m) if a glass lled PTFE gasket.
See Figure 4.
Note: On regulator with Cv3.8, torque the retainer to 15 ft-lb
(2 daN.m).
Regulator must be isolated and pressure vented
before disassembly.
Figure 4 - Tightening the seat ring retainer (4)
Carefully avoid that seating surface of the plug
contacts the seat ring during the plug unscrewing.

Masoneilan 535V Reducing and 535V-50 Di󰀨erential Pressure Regulators Manual | 7© 2021 Baker Hughes Company. All rights reserved.
Figure 3 - Type 535V Regulator (Cv0.60 for example)
Parts Reference
Ref. Part Name Ref. Part Name Ref. Part Name
l2 Seat Ring Gasket(1) 7Packing Flange Stud 13 Body
3Seat Ring 8a Mounting Nut 16 Mounting Screw
3e Seat Ring (Only on Cv< 0.10(2)) 8b Packing Flange Nut 27 Plug Stem Nut
3f Spacer (Only on Cv< 0.10(2)) 9 Packing Follower l182 Retaining Ring (Only on Cv< 0.10(2))
4Seat Ring Retainer 10 Packing Flange l183 Plug-Stem (Only on Cv< 0.10(2))
5Packing Spacer 11 Safety Pin
l6 Packing 12 Plug-Stem
l= Recommended spare parts
1. Non-existent on Cv3.8.
2. Complete sub-assembly includes: Plug-stem (183), Retaining ring (182), Seat ring (3e) and Spacer (3f). See Figure 2.
• Insert the plug-stem (12 or 183) into the seat ring (3). For
a Cv< 0.10, ensure that there is no binding during the
stroking of the plug. If binding occurs, loosen the retainer (4)
and replace the seat ring (3e) in the correct position until the
stem smoothly slides.
• Slide spacer (5) aligning the hole in the spacer with the
safety pin (11) hole in the valve body.
Note: For a Cv smaller than 0.10, ensure that the retaining
ring (182) is placed on the plug before engaging it in the
spacer (3f). If the retaining ring is damaged, replace it.
• Wrap the safety pin (11) with two turns of PTFE tape
(Teon). Screw it into the bonnet ve and a half to six turns
from where threads engagement starts.
Note: To nd start of threads engagement, proceed as follows:
a. Screw safety pin about one turn,
b. Pull safety pin outwards while unscrewing it.
•

© 2021 Baker Hughes Company. All rights reserved.8 | Baker Hughes
• Install packing, positioning the skive cut of each packing
ring 120˚ away from the cut of an adjacent ring. Slightly
push down rings one after another using a tube 1/2”
schedule 160 size. Install packing follower (9) on the plug
stem.
• Hold actuator above body S/A. Before that actuator stem
contacts the plug stem, screw two nuts (8a) on the two
studs (7), slide packing ange (10) on the stem and the
studs and screw the two nuts (27) to the threaded end of
plug stem.
• While holding the plug in “Open” position, slowly pull down
the actuator and screw the plug stem into the actuator stem.
Note: This operation will be facilitated turning the plug by
means of a wrench applied on the nuts (27) tightened one
against the other.
Carefully avoid that seating surface of the plug contacts
the seat ring during the plug screwing.
Pulling down motion of the actuator and plug stem screwing
must be simultaneously performed : carry on until the lower
part of actuator yoke con- tacts the body ange (13).
• Screw and tighten the two screws (16). Tighten also the two
nuts (8a). Finger tight the two packing ange nuts (8b).
• Unscrew the plug stem until the plug is seated.
• Screw one nut (27) against the lower part of the actuator
stem while placing a 2,5 mm shim between nut and stem
(see Figure 5).
• Tighten second nut (27) against the rst in this position.
Remove the shim and screw the plug stem into the actuator
stem, until the nuts contact the actuator stem. Lock by
means of a wrench applied on the nuts.
• Connect the controlled pressure line(s) to diaphragm case.
• Place back in service and tighten the nuts (8b), only as
much as is necessary to stop any leakage.
Packing box
Adding Packings
To add a ring of packing, depressurize the regulator, back o󰀨
packing ange nuts (8b) all the way, lift the packing ange and
follower and insert one ring of packing. Tighten nuts (8b) nger
tight plus one full turn.
Packing Quick Change Method
(For regulators Cv0.6 to 3.8 only)
The fastest and simplest way to replace packing is to remove
the entire actuator without disturbing actuator parts or
calibration. However, this is not recommended for regulators
with a small Cv(Cv < 0.6), due to the very neness of their
plug. In this event, disassemble the regulator to replace the
packing (See under “Disassembly”, page 5).
• Remove safety pin (11) from body. The safety pin engages
the packing spacer (5). The function of safety pin and
spacer is to prevent the plug from being pushed out if the
actuator is removed while the regulator is still pressurized.
The regulator internal parts cannot be removed unless the
safety pin is removed rst. Remove two packing ange
nuts (8b) and two mounting nuts (8a). Remove also two
mounting screws (16).
• Remove the actuator-plug assembly o󰀨 the regulator.
• Clean the packing box and plug stem and carefully place
new rings of packing around the stem. Position the skive cut
of each packing ring 120˚ from that of the adjacent ring.
• Reassemble the actuator-plug assembly to the regulator
body, taking care : (a) to align hole in spacer (5) with safety
pin hole ; (b) to replace two mounting nuts (8a) before nuts
(8b) ; (c) to take extra care in guiding each ring into the
packing box.
• Tighten two nuts (8a) and two screws (16) on the actuator
yoke.
• Wrap the safety pin (11) with two turns of PTFE tape
(Teon). Screw it into the bonnet ve and a half to six turns
from where threads engagement starts.
Note: To nd start of threads engagement, proceed as follows:
a. Screw safety pin about one turn,
b. Pull safety pin outwards while unscrewing it.
• Replace packing follower, packing ange and ange nuts
(8b). Tighten nuts nger tight plus one full turn. Place back
in service.
Regulator must be isolated and pressure vented
before disassembly.
Figure 5 - Plug-stem
adjustment

Masoneilan 535V Reducing and 535V-50 Di󰀨erential Pressure Regulators Manual | 9© 2021 Baker Hughes Company. All rights reserved.
Notes:

© 2021 Baker Hughes Company. All rights reserved.10 | Baker Hughes
Notes:

Masoneilan 535V Reducing and 535V-50 Di󰀨erential Pressure Regulators Manual | 11© 2021 Baker Hughes Company. All rights reserved.
Notes:

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, and
Masoneilan 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.
BHMN-535V-IOM-34597A-0121 01/2021
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valves.bakerhughes.com
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