Dresser Masoneilan 173 Series User manual

Instructions
EY0173
10/08
173 Series
Self-Operating
Pressure Regulators
DV-216-173 series Inst-fnl.indd c 11/20/08 9:29:49 AM

Table of Contents Page
0. WARRANTY........................................................................................................................................1
1. GENERAL INFORMATION................................................................................................................2
2. TRANSPORT, STORAGE AND HANDLING.....................................................................................2
3. INSTALLATION AND ASSEMBLY INSTRUCTIONS 173 SERIES
3.1 CROSS-SECTION DRAWING.........................................................................................................3
3.2 INSTALLATION................................................................................................................................4
3.3 START-UP AND CALIBRATION .....................................................................................................4
3.4 MAINTENANCE...............................................................................................................................5
4. INSTALLATION AND ASSEMBLY INSTRUCTIONS 173-50 DIFFERENTIAL PRESSURE
4.1 CROSS-SECTION DRAWING 173-50 SINGLE DIAPHRAGM.......................................................6
4.2 CROSS-SECTION DRAWING 173-50 DOUBLE DIAPHRAGM .....................................................7
4.3 INSTALLATION................................................................................................................................8
4.4 START-UP AND CALIBRATION .....................................................................................................8
4.5 MAINTENANCE...............................................................................................................................8
Caution: The instructions on the following pages should be thoroughly reviewed and understood prior to installing,
operating, or performing maintenance on this equipment. Throughout the text, safety and/or caution notes will appear
and must be strictly adhered to; otherwise, serious injury or equipment malfunction could result.
Copyright
Masoneilan®is a registered trademark of Dresser, Inc. All information contained herein is believed to be accurate at the time of publication and is subject to change without notice.
Copyright 2008 by Dresser, Inc. All rights reserved.
DV-216-173 series Inst-fnl.indd d 11/20/08 9:29:50 AM

1
Safety Information
Important - Please Read Before
Installation
Masoneilan 173 Series 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 control valve. 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 Masoneilan’s
written permission.
• Please report any errors or questions about the information
in this manual to your local supplier.
• These instructions are written specifically for the 173 Series
back pressure regulators, and do not apply to other
regulators outside of this product line.
Warranty
Items sold by Dresser®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 Dresser recommended usages. Dresser, Inc. reserves the
right to discontinue manufacture of any product or change
product materials, design or specifications without notice.
This instruction manual applies to the Masoneilan 173 Series
back pressure regulators.
The Regulator MUST BE:
• Installed, put into service and maintained by qualified
and competent professionals who have undergone
suitable training.
• 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 specifications, structure, and components
used may not lead to the revision of this manual unless
such changes affect the function and performance of the
product.
• All surrounding pipe lines must be thoroughly flushed to
ensure all entrained debris has been removed from the
system.
Instructions
EY0173 – 10/08
173 Series
Self-Operating Pressure Regulators
DV-216-173 series Inst-fnl.indd 1 11/20/08 9:29:50 AM

1. General Information:
1.0 Introduction
The following instructions are designed to assist maintenance
personnel in performing most of the maintenance required on
the series 173 regulators and if followed carefully will reduce
maintenance time.
Masoneilan has highly skilled Service Engineers available for
start-up, maintenance and repair of our regulators and compo-
nent parts. In addition, regularly scheduled training programs
are conducted to train customer service and instrumentation
personnel in the operation, maintenance and application of our
control valves, regulators and instrumentation. Arrangements
for these services can be made through your Masoneilan
Representative or District Office. When performing mainte-
nance use only genuine Masoneilan replacement parts. Parts
are obtainable through your local Masoneilan Representative
or District Office. When ordering parts always include MODEL
and SERIAL NUMBER of the unit being repaired.
2. Transport, Storage and Handling
Transport
Depending on their size, regulators can be transported loose,
packed in cardboard boxes or in wooden crates.
All the regulator ends are fitted with covers to prevent dirt from
entering. Units can be placed on pallets if required. Follow all
and any instructions noted on the packaging.
Operators moving loads must take all necessary precautions
to prevent accidents.
Storage
Regulators must be kept in a dry place to protect them from
atmospheric conditions. They may only be removed from their
crates or packing immediately prior to installation.
The end protections and covers must be kept on until installa-
tion. Regulators, whether packed or not, must not be subject
to impact.
Regulators, whether packed or not, must always be kept
upright, that is, never lying on one side, in order to prevent
distortion and damage to internal parts.
Handling
When unpacking the regulators and removing the end protec-
tors immediately prior to installation, take great care to make
sure that foreign material does not enter the regulator inlet
and outlet ports while it is being connected.
When handling the regulator, make sure the work area is
kept clear in order to prevent injury to people and damage to
property.
2
Instructions
EY0173 – 10/08
173 Series
Self-Operating Pressure Regulators
1st
1
2nd
7
3rd
3
1st
X
2nd
X
3rd
X
4th
X
Option
X
Regulator Series Action
1 Relieving
Metal Seat
2 Relieving
Soft Seat
Action
50 Differential
Pressure
Diaphragm
1 Metal
Diaphragm
2 Elastomeric
Diaphragm
Trim Size
01
05
08
10
12
16
20
35
45
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3
3. 173
3.1 Cross-section drawing
Construction ATEX Gr.II Cat.2 (Fig.4)
ATEX Construction Gr. II Cat. 2
Instructions
EY0173 – 10/08
173 Series
Self-Operating Pressure Regulators
Part
1 Blindhead
*2 Gasket Set
3 Body
4 Guide
5 Diaphragm Case
6 Ball
7 Diaphragm Plate (Upper)
*8 Diaphragm
*9 Protector – optional
*10 O-Ring
11 Spring Case
12 Spring
13 Adjusting Screw
14 Lock Nut
15 Spring Button
16 Nut
17 Spring Guide
18 Screw
19 Nut
20 Diaphragm Plate – Lower
21 Screw
*22 Plug
*23 Ring
*24 Disc
*25 Seat
*26 Screw
*27 Gasket Plate
28 Cap
* Recommended spare parts
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4
3.2.4 Please bear in mind that the regulated pressure sens-
ing port is located inside the regulator, therefore the pressure
drops in the inter-connecting piping between the regulator and
the point of use will affect the accuracy of the maintained set
pressure. This pressure drop must be considered when calcu-
lating the size of the connection piping.
3.2.5 When it is essential to avoid pressure variations at the
point of use, the regulators are fitted with an external sensing
line connection, as shown in Fig 8. The 1/8" female threaded
port must be connected to a nipple as near as possible to the
point of use.
Fig.8
External sensing line (only on request)
3.3 Start-Up and Calibration
3.3.1 The 173 series pressure regulators are shipped with a
pressure setting at the low end of the adjustable range unless
otherwise specified by the customer. The pressure setting
can be changed to any value within the adjustable range by
loosening the adjusting screw locknut (14) and turning the
adjusting screw (13) clockwise to increase the pressure set-
ting or counterclockwise to decrease the pressure setting.
During regulator start-up or operation, do not touch any part
of the regulator as this can conduct heat if the fluid used is at
a high temperature.
3.2 Installation
3.2.1 173 Series regulators must be installed with the actuator
(2) facing upwards and the diaphragm perfectly horizontal, as
shown in Fig.6.
In pressure reducing applications regulating very low down-
stream pressures (normally lower than 100 mm water column);
the regulator must be installed with the actuator facing down-
wards and perfectly horizontal (below pipeline) as indicated by
the nameplate orientation as shown in Fig. 7.
3.2.2 Before installation, ensure piping is clean, free of any
debris (machining chips, weld slag, etc). Contaminants
remaining in the piping system can damage internal compo-
nents of the regulator.
Fig.6
1) Adjustment screw (spring holder)
2) Actuator
3) Pressure gauge
4) Regulator body
5) Drain hole
Fig.7
3.2.3 WARNING/CAUTION ON ATEX USAGE: When handling/
working on harmless fluids (e.g. inert gases, like nitrogen,
carbon dioxide and noble gases) the spring cover is not normally
airtight (ATEX construction, Group II- Cat.2), and has a hole
(5) in Fig.6 and 7 which prevents it from pressurizing if the
diaphragm breaks. If the spring cover is airtight (Fig.4), made
from carbon steel and stainless steel, the hole (5) in Fig.6 and
7 is always threaded ¼"NPT and must be connected to pipe
conveying the discharge to a suitable place (safely and
constantly at atmospheric pressure).
This pipe shall be linked to
ATEX form (Gr. II Cat. 2)
only in case of non high-
explosive atmosphere
Instructions
EY0173 – 10/08
173 Series
Self-Operating Pressure Regulators
DV-216-173 series Inst-fnl.indd 4 11/20/08 9:29:51 AM

5
Align the holes of the diaphragm with those in the actuator
flange and install the spring, spring holder and spring case.
Install blindhead (1). Return the adjusting screw (13) to the
position marked by the nut (14) or the position noted (see
3.4.2.1). Exact adjustment must be checked when the regulator
is returned to service.
3.4.2.5 Diaphragm Replacement
The diaphragm may require replacement without having to
make other repairs. If the regulator is easy to access and
isolate, it can be replaced while leaving the regulator installed
in the piping provided it can be isolated. In this case, isolate
the regulator and vent all pressure. Ensure isolation valves
are locked to prevent accidental pressurization will working on
the regulator. Remove the actuator following the instructions
in section 3.4.1.2.
Replace and install the diaphragm and reassemble the actua-
tor as shown in section 3.4.2.4. Check calibration once more
when the regulator is returned to service.
When welding piping, do not attach the earth connector to the
regulator as this may damage important sliding parts.
3.4 Maintenance
3.4.1 The required maintenance interval will vary depending
on application. The user must establish a suitable mainte-
nance depending on the operating conditions. Prior to disas-
sembly remove all system pressure from the regulator.
Before starting the above operation, make sure the recom-
mended spare parts are available (Figs.1-2-3-4-5, parts list).
3.4.2 Disassembly (see Figs.1-2-3-4-5).
3.4.2.1 Actuator Disassembly
Remove spring compression by unscrewing the adjustment
screw (13) (counter-clockwise) after loosening the locknut
(14). The position of the locknut should be noted to allow clos-
er preliminary adjustment when reassembling. If the regulator
is equipped with a sealed cap (Fig.4), first remove the cap (28)
and gasket.
Remove the spring case (11) by loosening the nuts (19). Note;
it is not necessary to remove the housings on actuator sizes
220 and 360.
Remove the spring. Unscrew the nut (16).
Remove the diaphragm and washers.
3.4.2.2 Body Disassembly
Unscrew and remove the blindhead (1) with gasket. Unscrew
the seat (25) with a screwdriver (see Figs. 1, 2 and 5).
Pull the plug off its guide and remove it from the body.
3.4.2.3 Parts inspection
All the components are now ready to be inspected. Replace
any worn items. Clean all parts.
Pay particular attention to the condition of the disk and plug,
both elastomeric and metal, and the seat.
If the seat is worn, it may be able to restore it by lapping
using a metal disk and abrasive paste.
The diaphragm should be replaced if it shows any damage. The
same applies to Teflon diaphragm protector (if equipped).
Gaskets should not be re-used.
If preferred, the regulator may be returned to an authorized
Masoneilan repair center to be reconditioned.
3.4.2.4 Reassembly
Carry out the disassembly operations in reverse order.
Push the stem of the plug into body and push it into its guide.
Tighten the seat (25), making sure the washer is new and cor-
rectly positioned. Replace the small retention ring (10) after
thoroughly cleaning its seat.
Install the diaphragm, taking care to install the protector (9), if
applicable, underneath, towards the regulator body on top of
lower diaphragm plate (20). Install upper diaphragm plate (7)
and the spring guide (17) and fully tighten nut (16).
Instructions
EY0173 – 10/08
173 Series
Self-Operating Pressure Regulators
DV-216-173 series Inst-fnl.indd 5 11/20/08 9:29:51 AM

66
Fig. 9
Instructions
EY0173 – 10/08
173 Series
Self-Operating Pressure Regulators
4. 173-50 Differential Pressure Regulator
4.1 Cross-Section Drawing 173-50 Single Diaphragm
Part
1 Blindhead
*2 Gasket Set
3 Body
4 Guide
5 Diaphragm Case
6 Diaphragm Plate
*7 Diaphragm
*8 O-Ring
9 Spring Case
10 Spring
11 Nut
12 Screw
*13 Gasket
14 Lock Nut
15 Packing Gland
*16 Bearing
17 Spring Button
18 Adjusting Screw
19 Spring Guide
20 Screw
21 Nut
22 Screw
*23 Plug
*24 Ring
*25 Disc
*26 Seat
*27 Screw
28 Gasket Plate
* Recommended spare parts
DV-216-173 series Inst-fnl.indd 6 11/20/08 9:29:51 AM

77
4.2 Cross-Section Drawing 173-50 Double Diaphragm
Instructions
EY0173 – 10/08
173 Series
Self-Operating Pressure Regulators
Fig. 10
Part
1 Blindhead
*2 Gasket Set
3 Body
4 Guide
5 Diaphragm Case
6 Diaphragm Plate (Lower)
*7 Diaphragm
*8 O-Ring
9 Spring Case
10 Spring
11 Nut
12 Screw
*13 Gasket
14 Packing Gland
15 Lock Nut
*16 Bearing
17 Spring Button
18 Adjusting Screw
19 Spring Guide
20 Screw
21 Nut
22 Screw
*23 Plug
*24 Ring
*25 Disc
*26 Seat
*27 Screw
*28 Gasket Plate
29 Nut
30 Actuator Ring
31 Intermediate Plate
* Recommended spare parts
DV-216-173 series Inst-fnl.indd 7 11/20/08 9:29:59 AM

88
The 173-50 regulators comprise two groups of regulators:
Group 1 :
All the group 1 regulators have one diaphragm; one of the
controlled pressures acts under the diaphragm through an
internal sensing line connection while the other acts over the
diaphragm through a sensing line connection on the spring
housing. The plug is kept closed by the spring. The following
types belong to this group:
173-50 Single Diaphragm (see Fig. 9);
Group 2 :
All the group 2 regulators have two diaphragms separated
by a chamber communicating with the outside; the controlled
pressures act under the lower diaphragm (through an internal
sensing line connection) and over the upper diaphragm
(through a sensing line nipple on the spring housing). The
plug is kept closed by the spring.
The following types belong to this group:
173-50 Double Diaphragm (see Fig. 10);
4.3 Installation
4.3.1 All 173-50 regulators must be installed with the actuator
facing upwards and the diaphragm horizontal.
4.3.2 Installation diagrams.
In most cases the flow crosses the regulator as shown by the
arrow in Figs. 9 and 10.
The installation diagrams are therefore as follows:
4.3.3 - Group 1 regulators: Fig. 11
4.3.4 - Group 2 regulators: Fig. 12
4.3.5 Install an isolation valve upstream, downstream and
on the sensing and discharge line connection piping, in
order to service the regulator (if necessary) while the plant
is pressurized.
Install one filter or pressure gauge upstream from the
regulator and another one on the sensing line connection, as
shown in the diagrams, in order to calibrate the differential
pressure and keep it constantly under control.
4.3.6 Prior to installing the regulator in the piping, make
sure the inside of the pipes are clean and free of any debris
(machining cuttings, weld slag, etc.), especially the upstream
section; blow down the piping if possible to eliminate any
remaining dirt: small drops of weld slag may seriously
damage the regulator.
4.3.7 In group 2 regulators, the chamber between the two
diaphragms must be connected to piping to vent the discharge
to a suitable place, safely and constantly at atmospheric
pressure. This hole can be closed with a plug or pressure
gauge with an electrical contact for the remote signaling that
the diaphragm has broken, as long as the downstream plant
is protected as shown in the following.
4.3.8 If there is the slightest possibility of the pressure
upstream from the reduction regulator exceeding the
maximum admissible pressure for the installation, caused by
the failure of the overflow regulator, a safety relief valve must
be installed upstream, without an isolation valve in between,
in order to discharge the entire flow crossing the differential
pressure regulator.
4.3.9 Please keep in mind that the regulated pressure sensing
port is located inside the regulator, therefore the pressure
drops in the inter-connecting piping between the regulator
and the point of use will affect the accuracy of the maintained
set pressure. This pressure drop must be considered when
calculating the size of the connection
When it is essential to avoid pressure variations at the point
of use, the regulators are fitted with an external sensing line
connection, replacing the internal connection and fitted to
the lower flange of the actuator. This connection must be
connected as near as possible to the point of use where the
installation of a pressure gauge is also recommended.
4.4 Start-Up and Calibration (Figs. 9-10)
4.4.1 This operation is similar for both groups. The sensing
line connection regulator and the upstream and downstream
isolation valves must be closed. Slightly open the downstream
valve and then the upstream valve together with the sensing
line connection, making sure that the pressure difference read
on the pressure gauges is correct. If necessary, to decrease
it, turn the adjustment screw (18) clockwise to increase
differential pressure and counterclockwise to decrease.
When the required value is reached, fully open all the valves.
When the downstream system is working at full power,
calibrate by adjusting the screw (18).
4.5 Maintenance (Figs. 9-10)
4.5.1 The required maintenance interval will vary depending on
application. The user must establish a suitable maintenance
schedule depending on the operating conditions. Prior to
disassembly remove all system pressure from the regulator.
Before starting the above operation, make sure the recom-
mended spare parts are available (Figs.9-10, parts list).
4.5.2 Disassembly
Disassembling and reassembling operations for all types of
173-50 regulators as long as the diaphragms are considered.
These are:
- 1 single elastomeric diaphragm for 173-50 Single Diaphragm;
- 2 elastomeric diaphragms (one per side) for 173-50 Double
Diaphragm.
Make sure the spares match the above and take great care
when mounting the diaphragm assembly.
Instructions
EY0173 – 10/08
173 Series
Self-Operating Pressure Regulators
DV-216-173 series Inst-fnl.indd 8 11/20/08 9:30:07 AM

99
4.5.3 Actuator disassembly
Release the spring compression by turning the adjustment
screw counter-clockwise, counting and noting the number
of turns in order to restore calibration after reassembly.
Remove the spring housing (9) by loosening the nuts (21). It
is not necessary to remove the housings of the 220 and 360
actuators. Remove the spring.
- For Group 1 regulators: unscrew the nut (11) and remove
the diaphragm with the diaphragm plate (6) and spring
guide (19) - (see Fig. 9).
- For Group 2 regulators: unscrew the lock nut (11) and nut
(29); remove the double diaphragm assembly with ring (30),
intermediate plate (31), diaphragm plate (6) and spring
guide (19) - (see Fig. 10).
4.5.4 Body disassembly
Unscrew and remove the cover with relevant gasket. Unscrew
the seat with a screwdriver (see Fig. 9-10)
Pull the plug off its guide and remove it from the body.
Fig.11
Example of installation layout - Group 1 regulators: 173-50
Single Diaphragm.
Fig. 12
Example of installation layout – Group 2 regulators: 173-50
Double Diaphragm.
Instructions
EY0173 – 10/08
173 Series
Self-Operating Pressure Regulators
4.5.5 Parts inspection (Figs. 9-10)
All the components are now ready to be inspected. Replace
any worn items. Clean all parts.
Pay particular attention to the condition of the disc of the plug
(24), both elastomeric and metal, and the seat.
If the seat is worn, it may be able to restore it by lapping
using a metal disc and abrasive paste.
The diaphragm should be replaced if it shows any damage.
The same applies to Teflon diaphragm protector (if
equipped).
Gaskets should not be re-used.
If preferred, the regulator may be returned to an authorized
Masoneilan repair center to be reconditioned.
4.5.6 Reassembly
Carry out the disassembly operations in reverse order. Push
the stem of the plug into its guide and tighten the seat (26).
Screw back the cover (1). Install the diaphragm/s (see 4.5)
taking care to properly arrange the Teflon protectors. Make
sure the seats of the O-rings are perfectly clean before
mounting them. Assemble:
- for Group 1 regulators: plug assembly, diaphragm plate,
diaphragm and spring guide (with gaskets), nut.
- for Group 2 regulators: plug assembly, diaphragm plate,
lower diaphragm, intermediate plate and actuator ring,
upper diaphragm, spring guide (with gaskets), nut and lock
nut.
Match the holes of the diaphragm/s with the holes in the
actuator flange and install the spring, spring holder and
housing. Turn the adjustment screw the number of turns
noted down during dismounting. Exact calibration must then
be checked when the regulator is placed back into service.
4.5.7 Replacing the diaphragm
The diaphragm may require replacement without having
to make other repairs. If the regulator is easy to access
and isolate, it can be replaced while leaving the regulator
installed in the piping provided it can be isolated. In this case,
isolate the regulator and vent all pressure. Ensure isolation
valves are locked to prevent accidental pressurization will
working on the regulator. Remove the actuator following the
instructions in section 4.5.2.
Replace and install the diaphragm and reassemble
the actuator as shown in section 4.5, 4.5.3 and 4.5.6.
Check calibration once more when the regulator is returned
to service.
DV-216-173 series Inst-fnl.indd 9 11/20/08 9:30:07 AM

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Aftermarket Value Services
Dresser - Masoneilan, a leading manufacturer of automated process control solutions, offers world-class global aftermarket
services. Consistent and high quality services executed through a network of fully authorized and certified third party service
centers, as well as company owned facilities include: Valve Repair, Technical Training, Field Support, Spare Parts Supply,
Complete Equipment Replacement and Comprehensive Diagnostics.
About Dresser, Inc.
Dresser, Inc. is a leader in providing highly engineered
infrastructure products for the global energy industry.
The company has leading positions in a broad portfolio
of products including valves, actuators, meters, switches,
regulators, piping products, natural gas-fueled engines,
retail fuel dispensers and associated retail point of sale
systems and air and gas handling equipment.
Leading brand names within the Dresser portfolio include
Dresser Wayne®retail fueling systems, Waukesha®natural
gas-fired engines, Masoneilan®control valves, Mooney®
regulators, Consolidated®pressure relief valves, and Roots®
blowers and rotary gas meters. It has manufacturing and
customer service facilities located strategically worldwide
and a sales presence in more than 100 countries. The
company’s website can be accessed at www.dresser.com.
Dresser Masoneilan
With its breadth of products, unequaled global presence and
advanced process control expertise, Dresser Masoneilan is
uniquely positioned to be the leading provider of flexible,
best fit control valve solutions.
Supported by an integrated network of sales offices, Dresser
Masoneilan provides the widest range of valve solutions and
services for virtually every process control application.
© 2008 Dresser, Inc. All rights reserved.
EY0173 10/08
DV-216-173 series Inst-fnl.indd b 11/20/08 9:29:49 AM