Valmet Flowrox Expulse Series Manual

© Valmet, 4EXP70EN - 9/2023
Installation, operation and
maintenance instructions for
Flowrox™ Expulse™ Dampener
DN32 - DN100
These instructions must be read
carefully and understood prior
to the installation, use, and
servicing of this product.
Installation, maintenance and
operating instructions

4EXP70EN - 9/2023
2
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Copyright © 2014-2022 Valmet Corporation. All rights reserved.

34EXP70EN - 9/2023
READ THESE INSTRUCTIONS FIRST!
ese instructions provide information about safe handling and
operation of the product.
If you require additional assistance, please contact the
manufacturer or manufacturer’s representative.
SAVE THESE INSTRUCTIONS!
Addresses and phone numbers are printed on the back cover.
Table of Contents
1 EU DECLARATION OF
CONFORMITY 4
2 General safety instructions 5
3 Introduction 5
3.1 Applications and purpose of use 5
3.2 General description 6
3.3 Technical data 8
4 Transportation, Storage and
Lifting 9
5 Installation 9
5.1 General 9
5.2 Flow direction and support 10
5.3 Dampener installation 10
6 Operation 10
6.1 Commissioning and decommissioning 10
6.2 General maintenance and checks 11
6.3 Changing the hoses 11
6.4 Troubleshooting 15
Appendix A: Main dimensions of
Expulse™ dampener 16

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1 EU DECLARATION OF CONFORMITY
VALMET FLOW CONTROL OY
Marssitie 1
53100 Lappeenranta
Finland
declares herewith under the sole responsibility of the manufacturer that the Expulse
pulsation dampener size range DN32-DN100 is in conformity with the European
Community’s Directive PED 2014/68/EU.
Categorization:
Category I
Properties of uid:
PED Article 13 Fluid group 2
Conformity assessment procedure:
Module A
Following harmonized standard has been partially applied:
EN 12115:2021
On behalf of Valmet Flow Control Oy
In Lappeenranta, 14th September 2023
Riku Salojärvi
Senior Manager, Operations

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2 General safety instructions
e symbols in Table 1 are used in this manual to highlight
the parts requiring particular attention.
Hazard severity panels.
DANGER!
DANGER indicates a hazard with a high level of risk
which, if not avoided, will result in death or serious injury.
WARNING!
WARNING indicates a hazard with a medium level of
risk which, if not avoided, could result in death or serious
injury.
CAUTION!
CAUTION indicates a hazard with a low level of risk
which, if not avoided, could result in minor or moderate
injury.
Table 1. Warning and safety signs.
Symbol Description
Risk to personal safety:
Neglecting the safety measures can cause serious injury
or death.
Read the operation and maintenance instructions:
Read and understand the operation and maintenance
instructions before using the product.
Mandatory action symbol:
Obey these instructions to prevent machine
malfunctions.
Forbidden action symbol.
Prevent accidents and ensure the inline pulsation dampener’s
appropriate operation by complying with the installation,
safety, and maintenance instructions in this manual.
Installation and maintenance of the dampener must be
carried out by persons with appropriate training.
Access to the IOM-manual must be guaranteed at all times at
the place of operation of the inline pulsation dampener. It is
required to observe the IOM-manual in all work tasks for the
dampener.
Use personal protective equipment when performing any
checks or maintenance operation for the inline pulsation
dampener (goggles, helmet, clothing and gloves). Always
follow the factory safety regulations.
In case of any discrepancies between translations, the English
version shall prevail.
3 Introduction
3.1 Applications and purpose of use
Flowrox Expulse™ is a exible inline pulsation dampener,
which smoothes noises, restless pipes, pressure peaks and
uneven ows. e design is based on double hose structure;
damping hose, cover hose and compressed air in between. It
may be installed on a pulsating pump from any manufacturer
in the market.
e dampener is self-cleaning and does not collect sediment
or particles. It is resistant to wearing, corrosion and most
chemicals.
Flowrox Expulse™ provides a exible connection to the pump
and tolerates possible misalignments in the pipeline. e
dampener can also be easily removed if needed.
Restrictions on use for Expulse™ dampeners
e dampener temperature and pressure range must not be
exceeded. e temperature ranges are given in Table 2 for
standard hose materials.
e maximum operating pressure for the Expulse™
dampeners is 10 bar (1 MPa). Do not use higher pipeline
pressure than rated for the dampener.
e maximum lling air pressure between outer and inner
hoses is 6 bar (0,6 MPa)
Table 2. Temperature ranges for Expulse™ dampeners.
Hose material NR
Min operating temperature (°C) 0
Max operating temperature (°C) +95

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3.2 General description
Principle of operation
e wetted parts of Flowrox Expulse™ dampener are built
from stainless steel and NR as a standard structure. e hoses
are overlapping creating an air tight space between them. is
space is pressurized with oil free compressed air.
e Expulse dampener provides full bore through which
the medium can travel. e main components are shown in
Figure 1 and Figure 2.
e dampening eect can be adjusted with the air pressure.
Normally the needed pressure is 25-40% from the pipeline
pressure.
Figure 1. Main components of DN32 to DN65 Flowrox
Expulse™ dampeners.
Part Description Part Description
1Damping hose 7Valve
2Cover hose 8Plug
3Pulsation hose connector 9Lock nut
4Pulsation hose flange 10 O-ring
5Hose clamp 11 Threaded flange
6Preformed clamp

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Figure 2. Main components of DN80 and DN100
Flowrox Expulse™ dampener.
Part Description Part Description
1Damping hose 7Valve
2Cover hose 8Plug
3Pulsation hose connector 9Lock nut
4Pulsation hose flange 10 O-ring
5Hose clamp 11 Threaded flange
6Preformed clamp

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3.3 Technical data
Product identification
Flowrox dampener type plate is shown in Figure 3.
Figure 3. Example of type plate.
1. Dampener type (see Table 3)
2. Serial number (year, order number, series size,
individual serial number)
3. Customer tag number etc.
4. Nominal diameter, pressure class
Table 3. Expulse dampener model key table.
Type Size
(DN) -Pressure class (PN) -Flanges / Con- nector -Flange/Connector material - Wetted parts material
FPD = Flowrox
Pulsation Dampener
32
40
50
65
80
100
10 = 10 bar 0 = Threaded
connectors
2 = DIN PN10
Flanges
6 = ANSI 150
Flanges
Connector:
0 = FE
2 = AISI316
Hose:
NR = Natural Rubber
Example: FPD65-10-0-2-NR
The main dimensions and weight are given in Appendix A: Main dimensions
of Expulse™ dampener.

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4 Transportation, Storage and
Lifting
Check and document any damages in the transport packages
or dampeners. Contact the transportation company in case of
damage. When new or unused dampeners are sitting idle for
long periods, the following procedures should be complied
with:
1. Prior to storage, thoroughly drain dampeners of any and
all water.
2. Indoor storage is required. For unfavourable
environment, cover the equipment with protective
tarpaulin that will allow proper air circulation.
3. Protect the equipment from temperature and humidity
extremes and exposure to excessive dust, moisture,
vibration, sunlight, ozone and solvents.
4. Cover the flange openings.
5. Do not store any objects on top of the rubber hoses.
6. Before operation clean the dampener.
When storing used dampeners, wash them with fresh water
and follow the steps above. For storage periods greater than
36 months, please contact Valmet Flow Control as the rubber
parts need to be changed before use.
Lifting equipment must be used for dampeners weighing
over 25kg.
Li the dampeners securely from the cover hose (part 2). Use
so straps for liing as shown in Figure 4. Liing example.
Figure 4. Lifting example.
Do not attach liing equipment to the bore as it can damage
the dampener. For Expulse™ dampener dimensions and
weighs refer to Appendix A.
5 Installation
WARNING!
High pressure injection hazard.
Do not use higher pressure than rated for the dampener.
Higher pressures can cause serious damage to the
equipment and harm to operating personnel.
Do not pressurise the pipeline before the dampener is
properly installed.
Do not install the Flowrox Expulse™ dampener on the
feed side of a pump. The dampener is not designed to
work under vacuum may be damaged.
Do not twist or rotate the dampener with any tools if the
other end is attached to a pipeline. The dampener can be
damaged.
5.1 General
Flowrox Expulse™ inline pulsation dampeners are normally
delivered fully assembled and ready for use. Only personnel
with appropriate training are allowed to install the
dampeners.
If the dampener is delivered disassembled it must
be assembled in accordance with the manufacturer’s
instructions.
Flowrox Expulse™ dampeners include connections with
threaded connectors.
Reserve enough space for safe installation and maintenance.
See Appendix A for Expulse™ dampener dimensions.

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5.2 Flow direction and support
Do not step on a dampener installed in horizontal or
angled position.
e dampener does not have an intended ow direction;
therefore it can be freely installed to the pipeline.
e pipeline needs to be supported before and aer the
dampener.
Figure 5. Pipeline supports in horizontal installation.
Figure 6. Pipeline supports in angled installation.
5.3 Dampener installation
At least the following must be ensured before Expulse
dampener installation:
• The pipeline is isolated from the process and there is no
pressure in it.
• The pipeline is empty, clean, and cooled down.
• The pipeline connectors are with proper distance to
enable installation of dampener.
• The connector size is correct.
• The pump is locked in OFF position.
• The dampener is not pressurised.
1. Lift the dampener on place with appropriate lifting
equipment.
2. Apply pipe tape or hemp on the connector threads.
3. Tighten the connectors between the dampener and
pipeline.
Figure 7. Maximum dimension between the pipeline
center axes.
Dim X = 1 x DN size, for example for DN65 dampener
dimension X is 65mm (2.56 in).
Figure 8. Maximum angle between the pipeline center
axes.
Dim Y = 10º
6 Operation
6.1 Commissioning and decommissioning
Before the dampener is operated within the pipeline, ensure
that it has been installed in accordance with this manual and
applicable safety regulations.
e following must also be ensured:
• Parameters on the type plate are suitable for the process
and environment
• The dampener is used for the purpose specified at the
time of sales
1. Turn on the pump and drive it at the design pressure.
2. Slowly pressurise the dampener through the valve (part
7). Use compressed air with no oil. The maximum filling
air pressure is 6 bar (0,6 MPa).
3. Observe the effects and add more pressure until the
wanted dampening effect is reached. Normally the
needed pressure is 25-40% from the pipeline pressure.

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The maximum filling air pressure for the dampener
is 6 bar (0,6 MPa).
In case the process pipeline pressure is changed readjust
the dampener pressure.
When a dampener is decommissioned, dispose the parts
according to the local regulations and the instructions given
by the part or device manufacturer.
Collect and dispose dangerous process media, so that people
and environment are not endangered. Follow the local
regulations.
Servicing and Maintenance
6.2 General maintenance and checks
WARNING!
High pressure injection hazard.
Isolate the dampener completely from the process,
depressurise and drain it before changing the hoses.
Follow the factory safety regulations.
Do not step on the dampener installed in horizontal or
angled position.
Only personnel with appropriate training are allowed to
service the dampeners.
Check the condition of the dampener regularly. When the
dampener actuates awlessly, periodic inspection is the only
mandatory maintenance task. Do not neglect it as hoses wear
over time depending on conditions and process.
Scheduled maintenance
Include the dampeners in your factory maintenance program.
Maintenance tasks and service intervals are oered as a
guideline in Table 4. Schedules will vary with applications.
Table 4. Maintenance schedule.
Maintenance task Frequency & advice
Check the dampener pressure. Every month.
Check the dampener doesn’t hit
anything and there’s no leakage.
Every month.
Spare parts
To ensure correct and quick delivery of spare parts, the order
must contain the following information:
• Dampener type number as in type plate (example:
FPD65-10-0-2-NR)
• Spare part name and quantity (example: Damping Hose,
1 piece)
You can order the spare parts from Valmet's Flow Control
oces, distributors or agents. Contact information is available
at https://contact.neles.com/
It is recommended to keep 1 set of hoses and clamps as spare
parts at your factory warehouse. For part numbers refer to
gures 1 and 2.
6.3 Changing the hoses
To change the hoses, the dampener needs to be removed
from the pipeline. Part numbers refer to Figures 1 and 2.
WARNING!
High pressure injection hazard.
Do not disconnect a pressurized dampener from the
pipeline for any reason.
Removing the hoses
1. Shut down the pump and lock it to OFF position.
2. Depressurise and drain the pipeline according to factory
specific orders.
3. Depressurise the dampener with the valve (part 7) on the
hose flange.
4. Loosen the flange connections and lift the dampener
to a suitable working surface. Use lifting equipment on
dampeners weighing over 25kg.

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5. Cut both the cover (part 2) and damping (part 1) hoses
in half.
Figure 9. Cutting the hoses.
6. Remove the hose clamps (part 5) on the cover hose (part
2).
7. Remove the cover hose (part 2).
8. Remove the lock nuts (9), pulsation hose flanges (part 4)
and o-rings (10).
Figure 10. Removing the lock nuts (9), pulsation hose
flanges (part 4) and o-rings (10).
9. Remove the preformed clamps (part 6) and damping
hose (part 1).
Figure 11. Removing the preformed clamps and damping
hose.

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10. Clean the threads on the pulsation hose connectors (part
3).
Figure 12. Cleaning the threads.
Installing the hoses
Follow the general tightening torques in Table 5.General
tightening torques (bolt class 8.8, lubrication MoS2)., when
specic tightening instructions are not given. Part numbers in
these assembly instructions refer to gures 1 and 2.
Table 5. General tightening torques (bolt class 8.8,
lubrication MoS2).
Size M6 M8 M10 M12 M16 M20 M24
Tightening torques
Nm (ft-lbs) 7 (5) 17 (13) 33 (24) 57 (42) 140 (103) 282 (208) 499 (368)
1. Install damping hose (part 1) to the pulsation hose
connectors (part 3) and secure them with preformed
clamps (part 6).
Figure 13. Installing the preformed clamps and the
damping hose.

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2. Place the o-rings (part 10) on the pulsation hose
connectors.
Figure 14. Installing the o-rings.
3. Install one pulsation hose flange (part 4) and plug (part
8) to the other end of the dampener.
4. Install the lock nut (part9) on the pulsation hose flange.
Figure 15. Installing the pulsation hose flange and lock
nut.
5. Install the cover hose (part 2).

154EXP70EN - 9/2023
Figure 16. Installing the cover hose.
6. Install the second pulsation hose flange (part 4) and
valve (part 7).
7. Install the lock nut (part 9) on the pulsation hose flange.
8. Install the hose clamps (part 5) to the dampener.
Figure 17. Installing the pulsation hose flange and hose
clamps.
6.4 Troubleshooting
Table 6. Troubleshooting.
Problem Possible reason Action
Leakage from connection Connector is loose Tighten the connector. If needed add pipe tape or hemp fiber to the connection.
Hose lifetime is short Overpressure in dampener Adjust the air pressure according to the instructions in commissioning chapter
Dampener does not
decrease vibrations /
pressure variation
Dampener pressure not correct Adjust the air pressure according to the instructions in commissioning chapter
Damaged hose Check and change damaged parts

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Appendix A: Main dimensions of Expulse™
dampener
Dampener size
(DN) Length L Inner diameter D Threads T Weight (kg) Max Pressure (Bar)
32 1100 40 G1-1/4” Threads 710
40 1100 50 G1-1/2” Threads 11 10
50 1400 63 G2” Threads 13 10
65 1500 76 G2 1/2” Threads 18 10
80 1500 102 G3” Threads 38 10
100 2000 115 G4” Threads 55 10
Dimensions and weights are for guidance only – detailed
drawings are available on request.
All dimensions are in millimetres.

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© Valmet, 4EXP70EN - 9/2023
Subject to change without prior notice.
Neles, Neles Easyow, Jamesbury, Stonel, Valvcon and Flowrox, and certain other
trademarks, are either registered trademarks or trademarks of Valmet Oyj or its
subsidiaries in the United States and/or in other countries.
Valmet Flow Control Oy
Marssitie 1, 53600 Lappeenranta, Finland.
Tel. [phone]
www.valmet.com/owcontrol