Vag RIKO Manual

KAT-B 2010 Edition 7-1 / 01-18
Operating and maintenance instructions
VAG RIKO®Plunger Valve

We reserve the right to make technical changes and use similar
or higher quality materials. Drawings are non-binding.
Content
1 General 3
1.1 Safety 3
1.2 Proper use 3
1.3 Marking 3
2 Transportation and Storage 3
2.1 Transportation 3
2.2 Storage 3
3 Product and function description 3
3.1 Features and function description 3
3.2 Fields of application 4
3.3 Performance limits 4
3.4 Proper and improper mode of operation 4
4 Installation at the pipeline 4
4.1 Site requirements 4
4.2 Place of installation 4
4.3 Position of installation 5
4.4 Assembly instructions, fittings 5
5 Putting into operation and operation 7
5.1 Visual inspection 7
5.2 Function check and pressure test 7
6 Operators 7
6.1 General 7
6.2 Operating torque 7
6.3 Installation of an electric actuator 7
7 Maintenance and servicing 8
7.1 General safety instructions 8
7.2 Inspection and actuation intervals 8
7.3 Maintenance and replacement of parts 8
7.3.1 Design 9
7.3.2 Replacing the profile sealing ring
(Position 1.2) 10
7.3.3 Replacing the quad O-ring (Position 1.4) 10
7.3.4 Replacing the O-rings
(Position 1.10 and 1.1) 10
7.3.5 Tightening torque for the screws in [Nm] 10
8 Trouble-shooting 11

VAG Operating and maintenance instructions • 3
1 General
1.1 Safety
These operating and maintenance instructions must
be observed at all times and used jointly with the VAG
Installation and Operating Instructions for Valves. The
user must not change or modify this product or the
mounting parts / fittings supplied with it. VAG does not assume
any warranty or liability for consequential damage arising from the
non-compliance with these instructions. For the use of this valve,
the generally accepted technical rules (e.g. DIN standards, DVGW
standards - German association for gas and water , directives VDI
- German association for engineers, directives VDMA - German
association for engineering and installation etc.). The valves must
only be installed by qualified, specially trained staff. For further
specifications and information such as dimensions, materials and
fields of application, please refer to the related documentation
(KAT 2014-A).
Valves produced by VAG are designed and manufactured in ac-
cordance with international design and engineering standards.
Therefore they are principally operation safe. However, all valves
can represent a source of danger if they are used inappropriately
or for other purposes than the ones which they have been de-
signed for.
In the operator‘s company, each person associated with the in-
stallation, dismantling, operation or maintenance of the valves has
to read and understand the whole operation instructions (German
directives for accident prevention UVV, VBG1 § 14 and the fol-
lowing).
Before removing any protection device and/or beginning to work
on the valves, the concerned pipeline section has to be isolated.
As far as is possible all risk should be removed. Any unauthorised,
mistaken or sudden operation of the valve must be prevented;
care should also be taken to ensure any stored energy (pressu-
rised air or water) is removed.
When working on installations requiring supervision, the respec-
tive laws and directives (e.g. industrial codes of practice, direc-
tives for accident prevention, technical directives for steam boil-
ers, AD directives) have to be observed. Additionally, the local
directives for accident prevention and health and safety have also
to be observed.
If a valve at the end of a pressurised pipeline has to be opened,
it has to be done in such a way that the emerging fluid does not
cause any injury or damage. Caution must be taken when closing
and end of pipeline valve: Any human interference between the
body and closing piston may result in severe injury.
If a valve has to be dismantled from the pipeline, some fluid may
leak out from the pipeline or from the valve. The pipeline has to
be completely emptied before dismantling the valve. Take care of
later coming residues!
1.2 Proper use
The VAG RIKO®Plunger valve is a valve designed for installation
in pipelines. Plunger Valves are designed to fulfil special control
functions in water supply systems. The technical application limits
(e.g. working pressure, medium, temperature etc.) are described
in the product related documentation (KAT 2014-A). Solids in the
medium can lead to increased wear of the valve. Depending on
the type, load and particle size, these must be taken into account
when selecting the valve and planning the system. For any devi-
ating operating conditions and applications the user must obtain
the manufacturer‘s prior written approval.
1.3 Marking
According to DIN EN 19, every valve is marked with the nominal
width (DN), the nominal pressure (PN), the body material and the
manufacturer. The name plate on the body provides the following
information:
VAG Name of the manufacturer
DN Nominal width of the valve
PN Nominal pressure of the valve
Controlling equipment
Material of the body
Date of manufacturing
2 Transportation and Storage
2.1 Transportation
To transport the valve to its installation site, it must be
packed in a stable, properly sized container. The con-
tainer also needs to ensure that the valve is protected
against weather influences and damage. When the valve
is transported long distance (e.g. overseas) and exposed
to special climatic conditions, it needs to be protected
by sealing it in plastic wrapping and adding a desiccant.
The RIKO®Plunger Valve needs to be transported with
the feets on the floor (cf. Pictures 1). The factory-applied
corrosion protection coating and mountings (e.g. gear-
box or electric actuator) need to be specially protected.
Picture 1: Preferred transport position
2.2 Storage
The RIKO®Plunger Valve is to be stored horizontally on its feet (cf.
Pictures 1). The valves should be stored in a dry, well-ventilated
area. The direct exposure of the valves to radiation heat emitted
by radiators should be avoided. The assemblies and components
relevant for proper function of the valve, such as plunger must
be protected against dust and other kinds of dirt by appropriate
covers.
The valves have to be stored in a dry location, protected from
dirt and accidental damage. Protection caps and wrapping mate-
rial around the connection parts have to be removed immediately
before installation. Lifting gear such as ropes and belts must be
attached only to the body or the eye-bolts of the valve, not to the
actuator or gearbox.
3 Product and function description
3.1 Features and function description
Plunger valves are designed to fulfill regulating functions in the
water supply. Unlike butterfly or gate valves assuming

VAG Operating and maintenance instructions • 4
only shut-off functions in pipeline systems, plunger valves meet
the special requirements of regulating operations. The compact
and single-piece body is made of high quality ductile iron EN-JS
1030 (GGG 40). Up to DN 600 all inner parts are made of stain-
less steel. An essential advantage is the new piston guid: armour-
coated with bronze.
New sealing systems for pistons, shaft bearings and seats guar-
anty a good corrosion protection and high performance.
H1 = overpressure at entry of the valve (mWS)
H2 = overpressure at exit of the valve (mWS)
HAt = atmospheric pressure (mWS)
Hd = evaporating pressure (mWS)
v = flow rate in the pipe (m/s)
g = standard acceleration of free fall (m/s²)
VAG RIKO®Plunger Valves are dimensioned correctly when the
calculated s- value lies above the limit curves of sK. We recom-
mend a control range between 10-100% opening. Below there
is no reliable control function. However, if during commissioning
banging noises or severe vibration occurs, then the actual operat-
ing conditions have to be checked. It may be necessary to replace
the cylinder because of differing operating conditions. If the cal-
culated s- value lies under the limit curves of sKcavitation will
occur. The following remedies my help:
• replacing the orifice or slotted cylinder
• altering the back pressure
• installing the valve in another place
If the calculated s- value lies above the limit curves of sKthere
must be another cause for the noises. The whole pipeline should
be checked.
3.4 Proper and improper mode of operation
The maximum operating temperatures and pressures stated in
the technical documentation (KAT 2014-A) must not be exceeded.
The closed valve must only be exposed to the nominal pressure.
The maximum permissible flow velocity is that according to EN
1074-1. In addition to this, the Valve may be operated at flow ve-
locities of up to 5 m/s irrespective of the pressure level. Excep-
tions are the application in bottom outlets of dams.
4 Installation at the pipeline
4.1 Site requirements
When the valve is installed between pipeline flanges, the flanges
must be plane-parallel and in true alignment. Misaligned pipe-
lines must be put into a true alignment position before the valve
is installed. Otherwise the body may be exposed to impermissibly
high loads and strain during operation which may even cause the
body to break.
The installation of the valve in the pipeline should be as stress-
free as possible. The maximum pipeline forces the valve may be
exposed to are those stated in the EN 1074-5 standard.
It needs to be ensured that the space left between the flanges is
large enough to prevent damage of the coating of the raised faces
of the flanges when the valve is installed.
When work is done in the valve area which may cause dirt (e.g.
painting, erection of brick walls or concrete work), the valve must
be protected by a suitable cover.
4.2 Place of installation
The place of installation for the valve must be selected in a way
that ensures there is enough space to allow function checks and
maintenance work (e.g. dismantling and cleaning of the valve).
For open-air installation, the valve must be protected against ex-
Picture 2: Standard version -Type E
Picture 2.1: Version SZ (with slotted cylinder)
3.2 Fields of application
As the seals of the VAG RIKO®Plunger Valve are made of EPDM
materials, the valve can be used with the following media:
• Water, raw water, cooling water,
• Air
If the valve is used with media containing oil or gas, this may de-
stroy the EPDM O-rings and therefore the use with such media
is not permissible. If the valve is to be operated under deviating
operating conditions and in other fields of application, the manu-
facturer must be consulted.
3.3 Performance limits
VAG RIKO®Plunger Valves are designed for regulating the flow
rate. During operation, the cavitation limits have to be observed
according to calculation diagram of the VAG UseCAD®. The cavi-
tation value is calculated as follows, when the pressure values at
entry and at exit of the valve as well as the flow-through value are
known:
Calculating the s- Value:

VAG Operating and maintenance instructions • 5
treme weather conditions, such as the formation of ice, by cover-
ing it appropriately.
To ensure proper function and a long service life of the valve, sev-
eral factors need to be considered for the best place of installa-
tion.
Installed equipment in the pipeline upstream and downstream of
the VAG RIKO®Plunger Valve:
• When using polluted mediums a filter with a suitable mesh size
has to be provided upstream of the valve to sustain the function
of the control valve.
• Avoid installing an inspection valve, elbows, T-pieces and Y-
filters directly upstream of the VAG RIKO®Plunger Valve (5 x
DN) as this may cause irregular upstream flow and thus disturb
the function of the control valve.
• When installing the Plunger Valve as a control valve in a closed
pipeline, it has to be strictly observed that a straight outlet sec-
tion is provided downstream of the Plunger Valve, i.e.:
- for version with outlet type „E“, the length of this section
should be 8 - 10 x DN.
- for version with multiple orifice or slotted cylinder, this length
should be minimum 5 x DN.
• This means that fittings like elbows, T-pieces, Butterfly Valves,
Non-return Valves or Y-filters must not be installed within this
pipe section. By this the turbulent flow in the flow profile influ-
enced by the Plunger Valve can be calmed. If these precondi-
tions cannot be fulfilled, one has to expect with more noise and
damages at the corresponding components. Avoid arranging
diffusers on the outlet side. In this case, VAG RIKO®Plunger
Valves can be factory-mounted with a sudden enlargement.
If the distances required for inlet and outlet zones can not be
complied with this way, this may result in disturbances of the
plant or inferior control behaviour.
• The temperature limits for the flow medium must not be ex-
ceeded.
• The nominal pressure is the max. pressure to be applied on the
closed valve.
• Extending the operating elements is not allowed, by e.g. levers.
4.3 Position of installation
VAG RIKO®Plunger Valves can be installed in the vertical as well
as in the horizontal position. The valve will not operate in any other
pipeline position (Picture 4).
Top view
Flow direction
Plunger Valve
5 x DN
8 - 10 x DN for outlet “E”
5 x DN for slotted cylinder design “SZ”
or multiple orifice cylinder “LH”
DN
Picture 3: Arrangememt of the VAG RIKO®Plunger Valve
The flow-through direction arrow has to be observed. Pay atten-
tion to the direction of operation arrow on the valve body.
4.4 Assembly instructions, fittings
Before the valve is installed, it must be checked for transport or
storage damage. While being stored on the construction site be-
fore its installation, the valve must be protected against dirt by an
appropriate cover. When the valve is installed it must be free of
dust and dirt. VAG does not assume any liability for consequential
damage caused by dirt, grit etc.
The proper motion and function of the function parts should be
checked before installation.
If the valves are painted later on, it must be made sure that the
function parts are not painted over.
For the assembly of the VAG RIKO®Plunger Valve it needs to be
ensured that suitable lifting devices are available.
The valve may only be suspended using its eye bolts. If the valve
is suspended using any other parts, this may damage or even
destroy the valve.
When the valve is connected to the pipeline flanges, the hexago-
nal screws and bolts used in the bore holes must be screwed in
using washers from flange to flange.
The screws must be fastened crosswise to prevent unnecessary
tension and cracks or breaks that may result.
This will guarantee a regular pressure on the gaskets and thus the
leakproofness of the flange connection.
The pipeline must not be pulled towards the fitting. If the gap be-
tween the fitting and the flange is too large, this must be compen-
sated by using thicker seals. VAG recommends using steel-rein-
forced rubber seals to DIN EN 1514-1 Form IBC. If flared flanges
are to be used, these seals are mandatory.
Please note, the pipeline flanges to be connected to the valve
have to be aligned in axial and in parallel position.
Any remedial welding work carried out on the valve should be
completed before installation of the valve, in order to prevent
damage to the gaskets or to the valves protective coating. Re-
move any welding splashes before putting the valve into service.
The pipeline installation has to be carried out in such a way that no

VAG Operating and maintenance instructions • 6
Picture 4: Permissible / impermissible positions of installation and flow directions
permissible
impermissible
Indentification mark for
the “seat of the valve”

VAG Operating and maintenance instructions • 7
harmful strains occur upon the valve body. In the event that con-
tinued installation occurs near or above the valve, the valve has to
be covered for protection from accidental damage.
Should repainting of the installation be required, make sure that
no name or type plates are covered by the paint. If the installation
is blasted before painting, these plates have to be covered for
protection. If any detergents are used for cleaning, ensure that
no detergent damages the gaskets of the pipeline or of the valve.
DN PN Max. operating Max. operating temperature Test pressure in bar
nominal pressure for neutral liquides with water
pressure
mm bar bar °C in body in seat
150…2000 10 10 50 15 11
150…2000 16 16 50 24 18
150…1800 25 25 50 37,5 28
150…1200 40 40 50 60 44
Table 1 Factory test of the valve to DIN EN 12266
5 Putting into operation and operation
5.1 Visual inspection
Before putting the valve and the equipment into operation,
all functional parts must be subjected to visual inspection. All
screwed connections need to be checked as to whether they are
tightly fastened.
Before taking a new installation into operation and especially af-
ter preparation works, open the valves completely and purge the
pipeline system. When using cleaning or disinfecting agents, take
care that these do not attack the materials of the valve. Valves are
generally closed by turning the gear wheel clockwise.
Shafts and drives are designed in that way that the valves can be
operated by a person via a handwheel. Extensions for operation
are not admitted as they may cause damages on the valve by over
tension. The 90° movement of the disk is limited by a limit stop
in the actuator or gearbox. Excessive forced movement beyond
the limits will cause damage. Check the proper functioning of the
valve by opening and closing it a few times.
5.2 Function check and pressure test
Before the installation of the valve, its function parts should be
completely opened and closed at least once and their proper run-
ning should be tested.
Caution!! When closed, the Valve must only be exposed to pres-
sures not exceeding its nominal pressure (table 1). When a pipeline
pressure test is performed during which the test pressure exceeds
the permissible nominal pressure in the closing direction of the
valve, the pressure compensation must be effected via a bypass.
Carefully purge all newly installed pipeline systems in order to re-
move any foreign particles. Should residues or dirt particles be
in the pipeline they may clog installations such as multiple orifice
cylinders or slotted cylinders when the pipeline is flushed. This
may have a negative effect on the function of the valve or even
block it completely.
6 Operators
6.1 General
Operators such as manual gearboxes, pneumatic or electric actu-
ators are designed for flowing rates according to EN 1074-1 table
2 (valves for water supply, requirements for usability). The manu-
facturer should be informed of any differing operating conditions
than those for which the valve was designed. The setting of the
limit stops for open („AUF“) and close („ZU“) must not be altered
without the agreement of the manufacturer. If a valve without an
operator is to be installed, it is essential that the valve will can-
not be pressurised. VAG RIKO®Plunger Valves are designed with
an angular adjustment of 90°. The valve itself has no limit stops;
therefore the drive has to be equipped with limit stops. The drive
has to have been designed for rotation in anti-clockwise direction
in relation to the valve shaft.
The adjustments of the limit stops have to be in accordance with
the operating instructions for AUMA worm gears. When retrofitting
a gear, the nominal torque and the limit stops for open („AUF“)
and close („ZU“) have to be adjusted accordingly to the valve. Non
compliance of these directives may cause danger to life and limb
and/or cause damage to the pipeline system. If operators fed by
separate power supply (electric, pneumatic or hydraulic) have to
be dismantled from the valve, the safety directives in 1.1 have to
be observed and the separate power supply must be switched of
and isolated.
6.2 Operating torque
The values given in table 2 (following page) are the maximum re-
quired torque [in Nm] at the drive shaft at full differential pressure
with an included safety factor of 1.5.
6.3 Installation of an electric actuator
The electric actuator is to be installed onto the input flange of the
gear box. The size of the actuator should be selected according to
the maximum operating torques listed in table 2.
The valve is shut-off:
• in open position depending on the limit
• in close position depending on the limit.
These switches are adjusted at VAG factory. The torque switches
act as overload protection in the intermediate positions. In case
a valve is retrofitted with an electric actuator, the limit switches
must be adjusted after the installation of the actuator. For adjust-
ment, see the operating instructions of the electric actuator manu-
facturer.
Observe the respective safety directions of VDI / VDE and the in-
structions of the electric actuator manufacturer.

VAG Operating and maintenance instructions • 8
Table 2
DN 150 200 250 300 400 450 500 600 700 800 900 1000 1200 1600 1800 2000
PN 10
max. operating torque [Nm]
at input of gear box
20 20 20 20 20 25 25 25 40 50 30 40 30 200 130 190
turns/stroke 20,5 20,5 20,5 20,5 20,5 20,5 26,8 52 52 52 155 155 212 212 424 424
PN 16
max. operating torque [Nm]
at input of gear box
20 20 20 20 25 30 25 30 55 70 40 60 40 230 150 210
turns/stroke 20,5 20,5 20,5 20,5 20,5 20,5 26,8 52 52 52 155 155 212 212 424 424
PN 25
max. operating torque [Nm]
at input of gear box
20 20 20 25 45 50 40 40 70 90 45 90 55 260 175 250
turns/stroke 20,5 20,5 20,5 20,5 20,5 20,5 26,8 52 52 52 155 155 212 212 424 424
PN 40
max. operating torque [Nm]
at input of gear box
20 25 35 35 50 60 45 45 90 120 70 110 75 - - -
turns/stroke 20,5 20,5 20,5 20,5 20,5 20,5 26,8 52 52 52 155 155 212 - - -
7.1 General safety instructions
Prior to any inspection and maintenance work to be performed
on the valve or mounted parts and attachments, the pressurized
pipeline must be shut off, the pressure must be relieved and the
system must be secured against unintentional switching on. De-
pending on the kind and criticality of the medium or fluid con-
veyed, all the required safety regulations must be complied with!
Upon completion of the maintenance work and prior to resuming
operation, all connections must be checked for proper fastening
and leak-freeness. The individual steps as stated under Section 5
need to be performed.
Please note, a plunger valve is not self-locking. Therefore neither
the drive nor the gear must be dismantled while the valve is pres-
surised. This section also applies when the valve is completely
dismantled.
7.2 Inspection and actuation intervals
The leak-freeness, smooth operation and corrosion protection of
the valve should be checked at least once per year (DVGW Tech-
nical Rules W 392).
Under extreme operating conditions, inspection needs to be done
at shorter intervals.
The body seals can be replaced, if required, depending on the
type of fluid conveyed.
7.3 Maintenance and replacement of parts
The spare parts needed can be found in the spare parts list in
chapter “7.3.1 Design”.
7 Maintenance and servicing

7.3.1 Design
Pos. Description Material Spare part
1.1 Body EN-JS 1030 (GGG 40)
1.2 Profile sealing ring EPDM X
1.3 Retaining ring 1.4301
1.4 Quad O-ring EPDM X
1.5 Hexagon socket head cap screw A4-70 X
1.6 Bearing flange EN-JS 1030 (GGG 40)
1.7 Bearing bush G-CuSn12
1.8 Thrust washer G-CuSn12 X
1.9 Counter bearing bush G-CuSn12
1.10 O-ring EPDM X
1.11 O-ring EPDM X
1.12 Hexagon cap screw A4-70
1.13 Threaded pin A4-70
1.14 Plug 1.0038
1.15 Screw plug A4-70 X
1.16 Gasket Centellen X
2.1 Crank X5 CrNi18 9 (1.4301)
2..1* Crank from DN 700 EN-JS 1030 (GGG-40)
2.2 Crank bolt X20 Cr13 (1.4021)
2.3 Piston rod X5 CrNi18 9 (1.4301)
2.3* Piston rod from DN700 EN-JS 1030 (GGG-40)
2.4 Cylinder bearing Bronze / PTFE X
2.5 Washer A4-70
2.6 Split pin X20 Cr13 (1.4021) X
2.7 Thrust washer POM X
2.8 Piston rod bearing DN150...250 X20 Cr13 (1.4021)
2.8*1Piston rod bearing DN300...600 X5 CrNi18 9 (1.4301)
2.8*2Piston rod bearing from DN 700 EN-JS 1030 (GGG-40)
2.9 Retaining ring piston rod bearing X5 CrNi18 9 (1.4301)
2.10 Hexagon socket head cap screw A4-70 X
3.1 Crank shaft X20 Cr13 (1.4021)
3.2 Key X5 CrNi18 9 (1.4301)
4 Plunger X5 CrNi18 9 (1.4301)
5 Coupling C45 - AUMA
6 Gear box AUMA GS.3
7 Set screw A4-70
8 Nut A4-70
9 Washer A4-70
Table 3
1.15 1.1 1.4
41.2 1.3 1.5
2.10
2.9
2.8
2.3
2.4
2.6
2.2
2.5
1.14
1.9
1.7
3.1
3.2
1.8
1.12
1.6
1.13
6 5 7 9 8

VAG Operating and maintenance instructions • 10
7.3.2 Replacing the profile sealing ring
(Position 1.2)
• Open the VAG RIKO®Plunger Valve completely up to the limit
stop.
• Unscrew the hexagon socket head cap screws (1.5) and the
retaining ring (1.3).
• Clean the parts thoroughly.
• Replace the profile sealing ring (1.2).
• Apply a thread locking substance on the hexagon socket head
cap screws (1.5) and tighten them according to table 4.
7.3.3 Replacing the quad O-ring (Position 1.4)
• Dismantle the VAG RIKO®Plunger Valve as described in 7.3.2.
• Unscrew the hexagon socket head cap screws (2.10) within the
plunger piston.
• Remove the retaining ring / push rod bearing (2.9).
• Remove the plunger (4). The crank drive (crank, piston rod and
piston rod bearing) remains in the valve.
• Clean the parts thoroughly.
• Replace the quad O-ring (1.4).
• Re-assemble in reverse order. Tighten the screws according to
table 4.
7.3.4 Replacing the O-rings
(Position 1.10 and 1.1)
• Dismantle the VAG RIKO®Plunger Valve as described in 7.3.2.
• Unscrew the gear box nuts (8).
• Unscrew the hexagon cap screw (1.12) and remove the bearing
flange (1.6).
• Remove the crank shaft (3.1) together with the thrust washer
(1.8).
• Remove the bearing bush (1.7).
• Clean the parts thoroughly.
• Replace the O-rings (1.10 and 1.11).
• Re-assemble in reverse order. Tighten screws according to ta-
ble 4.
• Observe the position of the bearing bush (1.7). The shoulder of
the bearing bush must show towards the gear box.
• Attention: Insert the hexagon cap screws (1.12) only to adjust
the shaft with the bearing.
• Tighten the screwed connection with the threaded pins (1.13).
• Continue re-assembling in reverse order.
• Re-install the gear box.
• Tighten the gear box nuts (8) according to table 4.
• Re-adjust the limit stops of the gear. (See operating instructions
for AUMA worm gears)
Picture 5: Detail view
DN M6 M8 M10 M12 M16 M20 M24 M30 M36 M42 M48
1.5 Cylinder screw, retai-
ning ring, body 5 10 20 35 80 160 300 - - - -
1.12 Hexagon cap screw,
bearing cover 4 8 15 25 60 120 - - - - -
1.13 Threaded pin, bearing
cover 4 8 15 25 60 - - - - - -
2.10 Hexagon socket head
cap screw, retaining ring,
piston
5 10 20 35 80 160 300 580 1000 1600 2500
8 Nut, gear box - - 35 60 150 290 500 950 1650 - -
Table 4
1.7 3.1 1.10 1.12
1.10 1.11 1.13
7.3.5 Tightening torque for the screws in [Nm]

8 Trouble-shooting
For all maintenance and repair work please observe the general
safety instructions under Section 7.1.
Problem Possible cause Remedial action
Valve makes noises
Unfavourable installation position and
thus unfavourable flow at the valve (e.g.
installed to closely behind the elbow)
Change installation position (cf. Section 4.3)
Valve operating beyond the design limits
Check design and/or operational data; if requi-
red, change resistance in valve by using other
internals.
Valve can not be operated
Foreign particle jammed in the seat area Flush valve; if required, disassemble valve and
remove foreign object
Gear blocked Dissolving the blockage
Electric actuator not yet connected to
power supply
Connect to power supply
Unfavourable flow at the valve and
obstruction of the movement Change installation position (cf. Section 4.3)
Leaks in the body seat
Valve not completely closed yet Close valve completely
Valve sealing damaged or worn Replace sealing ring

Edition 7-1 - 01/2018
Problem Possible cause Remedial action
Desired flow volume is not reached
Operational data have been changed
Check design and/or operational data; if
required, change resistance in valve by
using other internals.
Dimensions of multiple-orifice or slotted
cylinders too small.
Multiple-orifice or slotted cylinders
optionally are clotted. Flush valve; if required, disassemble valve
and remove foreign object
Flow volume too high
Operational data have been changed
Check design and/or operational data; if
required, change resistance in valve by
using other internals.
Dimensions of multiple-orifice or slotted
cylinders to large
Desired back pressure too high
Operational data have been changed
Check design and/or operational data; if
required, change resistance in valve by
using other internals.
Dimensions of multiple-orifice or slotted
cylinders to large
Cavitation in valve
Valve operating beyond the design limits
Check design and/or operational data; if
required, change resistance in valve by
using other internals.
Operational data have been changed
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