Masoneilan 171 Series User manual

Instructions
EY0171-0172
10/08
171 and
172 Series
Self-Operating
Pressure Regulators
DV-215-171_172 series Inst-v13.indd 3 11/5/08 12:13:35 PM

Table of Contents Page
1. GENERAL INFORMATION ............................................................................................................ 2
2. TRANSPORT, STORAGE AND HANDLING ................................................................................. 2
3. INSTALLATION AND ASSEMBLY INSTRUCTIONS 171 & 172 SERIES
3.1. CROSS-SECTION DRAWING ............................................................................................... 3
3.2. INSTALLATION...................................................................................................................... 4
3.3. START-UP AND CALIBRATION............................................................................................ 4
3.4. MAINTENANCE ..................................................................................................................... 5
3.5. 171 & 172 VERSIONS WITH BALANCING SPRING............................................................. 5
4. INSTALLATION AND ASSEMBLY INSTRUCTIONS – 172-50 DIFFERENTIAL PRESSURE
4.1. CROSS-SECTION DRAWING – 172-50 SINGLE DIAPHRAGM........................................... 6
4.2. CROSS-SECTION DRAWING – 172-50 DOUBLE DIAPHRAGM CONSTRUCTION ........... 7
4.3. INSTALLATION...................................................................................................................... 8
4.4. INSTALLATION DIAGRAMS.................................................................................................. 8
4.5. START-UP AND CALIBRATION............................................................................................ 8
4.6 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-215-171_172 series Inst-v13.indd 4 11/5/08 12:13:37 PM

Instructions
EY0171-0172 – 10/08
171 and 172 Series
Self-Operating Pressure Regulators 1
Safety Information
Important - Please Read Before
Installation
Masoneilan 171/172 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 171 & 172
Series pressure reducing 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 171 & 172
Series pressure reducing 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.
DV-215-171_172 series Inst-v13.indd 1 11/5/08 12:13:37 PM

1. General Information:
1.0 Introduction
The following instructions are designed to assist maintenance
personnel in performing most of the maintenance required on
the 171 & 172 Series 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 instruments. Arrangements
for these services can be made through your Masoneilan
Representative or District Office. When performing main-
tenance use only 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. Packs can be placed on pallets if required. Follow all
and any indications written 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 the last
moment. Regulators, whether packed or not, must not be
subject to violent knocks. 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 bodies do not enter the regulator inlet and
outlet holes 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
EY0171-0172 – 10/08
171 and 172 Series
Self-Operating Pressure Regulators
1st
1
2nd
7
3rd
2
1st
X
2nd
X
3rd
X
4th
X
Option
X
Regulator Series Action
1 Reducing
Metal Seat
2 Reducing
Soft Seat
Action
50 Differential
Pressure
Diaphragm
1 Metal
Diaphragm
2 Elastomeric
Diaphragm
Trim Size
01
02
03
04
05
06
08
10
12
14
16
18
20
22
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3. Installation and Assembly Instructions – 171 & 172 Series
3.1 Cross-Section Drawing
3
Instructions
EY0171-0172 – 10/08
171 and 172 Series
Self-Operating Pressure Regulators
Figs.1-2-3-4-5 show the cross-sectional view of the Model 172 regulators
along part names and versions.
Part
1 Blindhead
*2 Gasket Set
3 Body
4 H.P. Insert
5 Inlet Flange
*6 Plug
7 Diaphragm Case
*8 Diaphragm
*9 Protector – optional
*10 O-Ring
11 Diaphragm Plate
12 Spring
13 Spring Case
14 Lock Nut
15 Adjusting Screw
16 Spring Button
17 Nut
18 Spring Guide
19 Screw
20 Nut
21 Diaphragm Plate – Lower
22 Screw
23 Guide
24 Outlet Flange
*25 Disc
26 Stud
27 Nut
*28 Plug Screw
29 Screw
30 Cap
31 Ball
32 Ball Seat
33 Spring
34 Pin
* Recommended spare parts
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4
3.2 Installation
3.2.1 171 & 172 Series regulators must be installed with the
actuator 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
downwards 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 components
of the regulator.
Fig.6
1) Adjustment screw
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 case
is not normally airtight (ATEX construction, Group II- Cat.2),
and has a hole (5) in Fig.6 and 7 which prevents it from pres-
surizing if the diaphragm breaks. If the spring case 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).
Instructions
EY0171-0172 – 10/08
171 and 172 Series
Self-Operating Pressure Regulators
This pipe shall be linked to
ATEX form (Gr. II Cat. 2)
only in case of non high-
explosive atmosphere
Fig.8
Pressure reduction system: 1) Reducing regulator –
2) safety relief valve – 3) pressure gauge
3.2.4 Please keep 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
calculating 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. 9. The 1/8" female threaded
port must be connected to a nipple as near as possible to the
point of use.
3.2.6 If you are not sure that the regulated fluid is clean, install
a filter before the regulator.
Fig.9
External sensing line nipple (only on request)
3.3 Start-Up and Calibration
3.3.1 The 171 and 172 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 turn-
ing the adjusting screw (15) clockwise to increase the pressure
setting or counterclockwise to decrease the pressure setting.
DV-215-171_172 series Inst-v13.indd 4 11/5/08 12:13:37 PM

5
3.4 Maintenance
The required maintenance interval will vary depending on
application. The user must establish a suitable maintenance
depending on the operating conditions. Prior to disassembly
remove all system pressure from the regulator.
3.4.2 Disassembly (see Figs.1-2-3-4-5).
3.4.2.1 Actuator:
Remove spring compression by unscrewing the adjustment
screw (counter-clockwise) after loosening the lock nut. The
position of the locknut should be noted to allow closer pre-
liminary adjustment when reassembling. If the regulator is
equipped with a sealed cap (Fig.4), first remove the cap (30)
and gasket.
Remove the spring case (13) by loosening the nuts (20). Note;
it is not necessary to remove the housings on actuator sizes
220 and 360.
Remove the spring. Unscrew the nut (17).
Remove the diaphragm and washers.
3.4.2.2 Body removal:
Unscrew the nuts (27c) and remove the blindhead (1). Unscrew
the nuts (27a) Fig.1 (flanged regulator) or the screws (29)
Fig. 2 (threaded regulators). Remove the high pressure insert
(4) keeping the plug in position; remove the plug.
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 disc and plug,
both elastomeric and metal, and the seat area of the high-
pressure body.
If the seat is worn, it may be able to restore it by lapping using
a metal disk and abrasive paste.
If preferred, the regulator may be returned to an authorized
Masoneilan repair center to be reconditioned.
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.
3.4.2.4 Reassembly
Carry out the disassembly operations in reverse order.
Push the plug stem into the guide, replace gaskets (2a) and
put the high pressure insert into position. Tighten the nuts or
screws. Replace the small retention ring (10) after thoroughly
cleaning its seat. Install the diaphragm, taking care to install
the Teflon diaphragm protector (if equipped), towards the
regulator body, lying on the lower diaphragm plate (21).
Replace the diaphragm and spring guide. Tighten the nut
(17), positioning the diaphragm so that when the diaphragm-
bracket assembly is fully rotated to the right and left, each hole
rotates by the same angle as the matching hole on the actuator
flange. This means that the bracket is at right-angles to the
high pressure insert. Match the holes of the diaphragm with
the holes in the actuator flange and install the spring, spring
button and spring case. Install the blindhead (1). Return the
Instructions
EY0171-0172 – 10/08
171 and 172 Series
Self-Operating Pressure Regulators
screw (15) to the position marked by the nut (14) or the posi-
tion you noted down (see 3.4.2.1). Exact calibration must then
be checked when the regulator starts working again.
3.4.3 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 3.4.2.1.
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 starts working again.
3.5 171 & 172 Versions with
Balancing Spring (Fig.5)
Some versions of the 171 & 172 Series regulators are
equipped with a balancing spring which is mounted on the
blindhead (1) (Fig.1). Note the existence of this spring during
operations involving disassembly and reassembly of the
blindhead (1) (see paragraph 3.4.2.2 - 3.4.2.4).
When welding piping, do not attach the ground to the regulator
as this may damage important sliding parts.
3.5.1 Model 171 with cast iron body
The Model 171 is identical to the 172 in the versions with
threaded ends (Fig.2), except for the following:
- the body is made from cast iron.
The body is closed by means of a threaded disc screwed onto
the body, instead of being attached with screws and nuts.
The inlet and outlet connections are always threaded. There
are therefore no substantial differences with respect to
installation, start-up and calibration, and maintenance.
It should only be remembered that the blindhead is threaded
and screwed to the body. The instructions for the Model 172
in the previous sections also apply to these versions. Remove
the blindhead (1) with a 46 mm hex wrench.
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66
4. Installation and Assembly Instructions – 172-50 Differential Pressure
4.1 Cross-Section Drawing – 172-50 Single Diaphragm
Fig.10
Instructions
EY0171-0172 – 10/08
171 and 172 Series
Self-Operating Pressure Regulators
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 H.P. Insert
25 Outlet Flange
26 Stud
27 Nut
*28 Plug Screw
*29 Disc
30 Inlet Flange
31 Pin
32 Screw
* Recommended spare parts
Note: Parts 7 and 8 are supplied in one set only
Note: Actuator sizes
220 and 360 in carbon
or stainless steel are
provided with a multi-
part spring case
DV-215-171_172 series Inst-v13.indd 6 11/5/08 12:13:38 PM

77
Fig.11
4.2. Cross-Section Drawing – 172-50 Double Diaphragm Construction
Instructions
EY0171-0172 – 10/08
171 and 172 Series
Self-Operating Pressure Regulators
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 H.P. Insert
25 Outlet Flange
26 Stud
27 Nut
*28 Plug Screw
*29 Disc
30 Inlet Flange
31 Pin
32 Screw
33 Nut
34 Actuator Ring
35 Intermediate Plate
* Recommended spare parts
Note: Parts 7 and 8 are supplied in one set only
Note: Actuator sizes
220 and 360 in carbon
or stainless steel are
provided with a multi-
part spring case
DV-215-171_172 series Inst-v13.indd 7 11/5/08 12:13:39 PM

8
4.4.5 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.
4.4.6 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 Figure 9. The 1/8" female thread-
ed port must be connected to a nipple as near as possible to
the point of use.
4.5 Start-Up and Calibration
4.5.1 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 differ-
ential pressure or counterclockwise to decrease it.
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).
4.6 Maintenance
4.6.1 The required maintenance interval will vary depend-
ing on application. The user must establish a suitable
maintenance depending on the operating conditions. Prior to
disassembly remove all system pressure from the regulator.
4.6.2 Disassembly
Disassembling and reassembly operations for all types
of 172-50 regulators as long as the different diaphragm
configurations are considered. These are:
- 1 single elastomer diaphragm for 172-50 Single Diaphragm
- 2 elastomer diaphragms (one per side) for 172-50 Double
Diaphragm Version.
4.6.3 Actuator disassembly
Remove spring compression by unscrewing the adjust-
ment screw (counter-clockwise) after loosening the lock nut.
The position of the locknut should be noted to allow closer
preliminary adjustment when reassembling. If the regulator is
equipped with a sealed cap (Fig.4), first remove the cap (30)
and gasket.
Remove the spring housing (9) by loosening the nuts (20).
Note; it is not necessary to remove the housings on actuator
sizes 220 and 360.
Remove the spring. Unscrew the nut (17).
Remove:
- the diaphragm with the relative washers for regulators
172-50 Single Diaphragm.
- the assembly comprising the two diaphragms, washers,
servomotor ring and intermediate plate for regulators 172-50
Double Diaphragm Versions.
The 172-50 regulators comprise two groups of regulators:
Group 1:
All the group 1 regulators have just 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 open by the spring. The following
types belong to this group:
172-50 Single Diaphragm (see Fig. 10);
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 connection) and over the upper diaphragm (through
a sensing line connection on the spring housing). The plug
is kept open by the spring. The following types belong to this
group:
172-50 Double Diaphragm (see Fig. 11)
4.3 Installation
4.3.1 All 172-50 regulators must be installed with the actuator
facing upwards and the diaphragm horizontal.
4.4 Installation Diagrams
In most cases the flow crosses the regulator as shown by the
arrow in Figs. 10-11. The installation diagrams are therefore
as follows:
Group 1 regulators: Fig. 12
Group 2 regulators: Fig. 13
4.4.1 Install an isolation valve upstream, downstream and
on the sensing and discharge line connecting piping, in order
to allow for servicing of the regulator (if necessary) while the
plant is operating. Install one filter or pressure gauge down-
stream from the regulator and another one on the sensing line,
as shown in the diagrams, in order to calibrate the differential
pressure and keep it constantly under control.
4.4.2 Before installing the regulator in the piping, make sure
the insides 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.
4.4.3 In group 2 regulators, the chamber between the two
diaphragms must be connected to piping taking 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 failed, as long as the downstream piping is
protected as described in section 4.4.4 below.
4.4.4 If there is the slightest possibility of the pressure
downstream from the regulator exceeding the maximum
allowable pressure for the downstream piping or equipment,
a safety valve must be installed, without any isolation valve in
between, capable of discharging the entire flow.
Instructions
EY0171-0172 – 10/08
171 and 172 Series
Self-Operating Pressure Regulators
DV-215-171_172 series Inst-v13.indd 8 11/5/08 12:13:40 PM

99
4.6.7 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 while working
on the regulator. Remove the actuator following the instruc-
tions in section 4.6.3
Replace and install the diaphragm and reassemble the
actuator as shown in section 4.6.2 – 4.6.6. Check calibration
once more when the regulator is returned to service.
4.6.4 Body removal:
Unscrew the nuts (27) and remove the blindhead (1).
Remove the nuts (27a) of the inlet flange (flanged regula-
tors), or the screws (32) of the regulators with threaded ends;
remove the high pressure body (24) keeping the plug in a suit-
able position. Remove the plug.
4.6.5 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 disc and plug,
both elastomeric and metal, and the seat area of the high-
pressure body.
If the seat is worn, it may be able to restore it by lapping using
a metal disc and abrasive paste.
If preferred, the regulator may be returned to an authorized
Masoneilan repair center to be reconditioned.
The diaphragm should be replaced if it shows any damage. The
same applies to Teflon diaphragm protector (if equipped).
Gaskets and O-rings (8) should not be re-used.
4.6.6 Reassembly
Carry out the dismounting operations in reverse order.
Push the stem of the plug into the guide and put the high
pressure insert into position with the pin (31). For regulators
with flanged ends, put the flange into position; tighten the
nuts or screws uniformly. Install the Diaphragm(s) (see 4.6.3.)
taking care to properly arrange the Teflon protectors, if
equipped. Make sure the seats of the O-rings are perfectly
clean before installiing them.
Assemble:
- for single diaphragm versions: bracket, diaphragm plates,
diapragm and spring guide disks (with relative gaskets), nut.
- for double diaphragm versions: bracket, diaphragm,
diaphragm plate, lower diaphragm, intermediate ring and
actuator ring, upper diaphragm, spring guide (with relative
gaskets), nut.
Before installing the nut and tightening, position the
diaphragm/s so that when the diaphragm-bracket assembly
is fully rotated to the right and left, each hole rotates by the
same angle as the matching hole on the actuator flange. This
means that the bracket is at right-angles to the high pressure
body.
Tighten the nut (and the lock nut for double diaphragm). Match
the holes of the diaphragm(s) with the holes in the actuator
flange and reinstall the spring, spring holder and spring case.
Install the blindhead (1). Turn the adjustment screw the
number of turns noted down during disassembly.
Exact calibration must then be checked when the regulator is
returned to service.
Instructions
EY0171-0172 – 10/08
171 and 172 Series
Self-Operating Pressure Regulators
Fig. 12 Example of installation layout –
Group 1 regulators: 172-50 Single Diaphragm
Fig. 13 Example of installation layout –
Group 2 regulators: 172-50 Double Diaphragm
DV-215-171_172 series Inst-v13.indd 9 11/5/08 12:13:40 PM

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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.
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