AVK 870 Series User manual

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Copyright © AVK Holding A/S, original version, rev. 11, 08-Mar-2022
Installation, Operation and Maintenance Manual -
Original Version
AVK Series 870 Plunger Valve
AVK series 870 is a plunger control valve which in some areas also is called a needle
valve in the industry for inline applications of regulation. Unlike butterfly or gate valves
assuming only fully open or shut off functions, plunger valves are designed to operate
in between and fulfil control functions (pressure and flow) in water supply systems.
The design holds a single-piece body of fusion bonded epoxy coated ductile iron
(above DN150) or stainless steel (up to DN150 and DN400, DN600). All internal
components are made of either stainless steel or bronze materials that guarantee
good anti-corrosion properties and a long lifetime.
DN200-600
DN80-150
DN400, 600

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Copyright © AVK Holding A/S, original version, rev. 11, 08-Mar-2021
1. AVK Series 870 exploded view, DN200-600

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Copyright © AVK Holding A/S, original version, rev. 11, 08-Mar-2022
AVK Series 870 parts list, DN200-600
No.
Description
Material
No.
Description
Material
1
Bolt
Stainless Steel
21
Body
Ductile Iron
2
Washer
Bronze
22
Piston Rail
Bronze
3
Retaining Ring
Stainless Steel
23
Bolt
Stainless Steel
4
Rubber Seal
EPDM
24
Set Screw
Stainless Steel
5
O-Ring
EPDM
25
O-Ring
EPDM
6
Bolt
Stainless Steel
26
Bush
Bronze
7
Lock Ring
Stainless Steel
27
O-Ring
EPDM
8
Bolt
Stainless Steel
28
Shaft
Stainless Steel
9
Piston Flange
Stainless Steel
29
O-Ring
EPDM
10
O-Ring
EPDM
30
Seal Housing
Bronze
11
Piston
Stainless Steel
31
Bolt
Stainless Steel
12
Washer
Stainless Steel
32
Key
Stainless Steel
13
Split pin
Stainless Steel
33
O-Ring
EPDM
14
Washer
Bronze
34
O-Ring
EPDM
15
Bush
Bronze
35
Bolt
Stainless Steel
16
Clevis Pin
Stainless Steel
36
Washer
Bronze
17
Push Rod
Stainless Steel
37
O-Ring
EPDM
18
Bolt
Stainless Steel
38
Upstream Cover
Stainless Steel
19
Key
Stainless Steel
39
O-Ring
EPDM
20
Crank
Stainless Steel
40
Lifting Eyebolt
Stainless Steel

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Copyright © AVK Holding A/S, original version, rev. 11, 08-Mar-2021
2. AVK Series 870 exploded view, DN80-150

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Copyright © AVK Holding A/S, original version, rev. 11, 08-Mar-2022
AVK Series 870 parts list, DN80-150
No.
Description
Material
No.
Description
Material
1
Bolt
Stainless Steel
17
Crank
Stainless Steel
2
Washer
Bronze
18
Body
Stainless Steel
3
Retaining Ring
Stainless Steel
19
Lifting Eyebolt
Stainless Steel
4
O-Ring
EPDM
20
Set Screw
Stainless Steel
5
Rubber Seal
EPDM
21
Bush
Bronze
6
Bolt
Stainless Steel
22
Shaft
Stainless Steel
7
Lock Ring
Stainless Steel
23
O-Ring
EPDM
8
O-Ring
EPDM
24
Seal Housing
Bronze
9
Piston
Brass
25
O-Ring
EPDM
10
Piston Flange
Stainless Steel
26
Bolt
Stainless Steel
11
Circlip
Stainless Steel
27
Key
Stainless Steel
12
Push Rod
Stainless Steel
28
Bolt
Stainless Steel
13
Bush
Bronze
29
Upstream Cover
Stainless Steel
14
Clevis Pin
Stainless Steel
30
O-Ring
EPDM
15
Key
Stainless Steel
16
Bolt
Stainless Steel

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Copyright © AVK Holding A/S, original version, rev. 11, 08-Mar-2021
3. AVK Series 870 exploded view, DN400, 600

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Copyright © AVK Holding A/S, original version, rev. 11, 08-Mar-2022
AVK Series 870 parts list, DN400, 600
No.
Description
Material
No.
Description
Material
1
Bolt
Duplex Steel
21
Body
Duplex Steel
2
Washer
Bronze
22
Piston Rail
Welded Bronze
3
Retaining Ring
Duplex Steel
23
Set Screw
Stainless Steel
4
Rubber Seal
EPDM
24
O-Ring
EPDM
5
O-Ring
EPDM
25
Bush
Bronze
6
Bolt
Duplex Steel
26
Bush
Bronze
7
Lock Ring
Duplex Steel
27
O-Ring
EPDM
8
Bolt
Duplex Steel
28
Shaft
Duplex Steel
9
Piston Flange
Duplex Steel
29
O-Ring
EPDM
10
O-Ring
EPDM
30
Seal Housing
Bronze
11
Piston
Duplex Steel
31
Bolt
Duplex Steel
12
Washer
Duplex Steel
32
Key
Stainless Steel
13
Split pin
Duplex Steel
33
O-Ring
EPDM
14
Washer
Bronze
34
Bolt
Duplex Steel
15
Bush
Bronze
35
Washer
Bronze
16
Clevis Pin
Duplex Steel
36
Upstream Cover
Duplex Steel
17
Push Rod
Duplex Steel
37
O-Ring
EPDM
18
Bolt
Duplex Steel
38
O-Ring
EPDM
19
Key
Duplex Steel
39
Lifting Eyebolt
Stainless Steel
20
Crank
Duplex Steel

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Copyright © AVK Holding A/S, original version, rev. 11, 08-Mar-2021
4. Table of contents
1. AVK Series 870 exploded view, DN200-600......................................................................2
2. AVK Series 870 exploded view, DN80-150........................................................................4
3. AVK Series 870 exploded view, DN400, 600.....................................................................6
4. Table of contents...............................................................................................................8
5. Principle of operation.........................................................................................................9
6. Health and safety at work..................................................................................................9
7. Receiving and storage.....................................................................................................10
8. Installation and commissioning........................................................................................10
8.1 General safety instructions .......................................................................................10
8.2 Fields of application..................................................................................................11
8.2.1 CE marking and the pressure equipment directive 2014/68/EU...........................12
8.3 Position of installation...............................................................................................12
9. Application hazards.........................................................................................................14
10. Operation and maintenance ............................................................................................14
10.1 Operation............................................................................................................14
10.1.1 Requirements from local authorities.................................................................14
10.1.2 Product life cycle..............................................................................................14
10.1.3 Operating pressure and temperature...............................................................15
10.1.4 Visual inspection..............................................................................................15
10.1.5 Function check and pressure test....................................................................15
10.2 Maintenance........................................................................................................15
10.2.1 General instructions.........................................................................................16
10.2.3 Inspection and operation intervals ...................................................................16
10.3 Repair of parts.....................................................................................................16
10.3.1 Replacing the O-rings in seal housing..............................................................17
10.3.2 Replacing the main rubber seal and O-ring in retaining ring.............................18
10.3.3 Tightening torque for the screws as the table shows........................................19
10.4 Disposal and recycling ........................................................................................19
11. Trouble shooting..............................................................................................................19
12. Recommended spare parts .............................................................................................20

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Copyright © AVK Holding A/S, original version, rev. 11, 08-Mar-2022
5. Principle of operation
AVK S870 plunger valve is mainly designed for water flow rate and pressure regulation in a
pipeline, unlike to butterfly and gate valve, which design provided only ON/OFF duty. The AVK
Plunger valve can be operated by an external actuator such as:
•Gearbox with hand wheel
•Electrical actuator
•Pneumatic actuator etc.
Required set up conditions, flow rates and differential pressures, can be achieved by axial
movement of the plunger, operated by crank mechanism. The relation between flow rate and
opening level is linear, making valve operation easier. Low operating torque is possible to
achieve due to pressure equilibrium on internal chamber. Small differential pressures can be
reached, when opening level approach to 50%.
The plunger is placed in the middle of the valve, water flow is sliding through round- shaped
chamber and four water paths, designed to increase flow velocity and pressure drop down. Four
bronze guide rails ensure no vibration during work and accurate alignment throughout full valve
stroke, mounted by bolts give possibility for maintenance service. "T" shape main seal located in
safety flow area ensuring minimal wear and guarantee long service life.
Cavitation can be avoided and guarantee no damage, by using anti-cavitation trims, slotted type
for medium differential pressures and perforated type for high differential pressures. Both types
designed to move cavitation bubbles into the center of valve outlet, therefore the AVK Plunger
valve can fully fulfil special control functions over a wide range in water supply systems.
6. Health and safety at work
Make sure all relevant Health and Safety issues and regulations are adhered to prior to and
during installation or maintenance work carried out on this product. It is the end user's
responsibility to ensure that safe working practices are followed at all times.
Whenever AVK’s products are installed, operated or maintained the inherent dangers of
pressurized liquids and gasses must be addressed. Before work on a valve or other piping
component is undertaken, that may involve the release of internal pressure, the valve or line
must be fully isolated, depressurized and drained prior to commencing the work. FAILURE TO
COMPLY WITH THIS MAY RESULT IN SEVERE INJURY OR DEATH.
All workers handling the product must be aware of the weight of the components or assemblies
to be handled and manipulated during installation and maintenance.
It is essential that staff undertaking these operations are adequately trained and it is the
responsibility of the end user that only trained and competent staff undertake these duties.
This manual has been designed to assist, but it cannot replace quality training in the workplace.
However, the AVK technical staff is always available and ready to answer questions relating to
specific problems that may not be covered by this manual.
AVK’s products are designed to be fit for purpose and to a high reliability standard. This
provides a safe, low risk product when used correctly for the purpose for which it was designed.
However, this assumes that the equipment is used and maintained in accordance with this
manual, and the user is advised to study it and to make it available to all staff that may need to
refer to it.

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Copyright © AVK Holding A/S, original version, rev. 11, 08-Mar-2021
AVK cannot be held responsible for incidents arising from incorrect installation, operation or
maintenance. The responsibility for this rests wholly with the end user.
7. Receiving and storage
Unloading must be carried out carefully. The load must be put gently to the ground without
dropping. Lift only by means of shackles in eyebolts on body.
If a forklift is used it shall have sufficient capacity to lift the required weight and have a valid
inspection certificate.
All workers involved in the unloading shall be able to perform their functions. They shall wear
safety boots, safety vest, safety goggles and hard hat.
All slings used for the lifting shall be of sufficient strength. A record shall document that they
have been stored under cool, dry conditions away from sunlight and chemical atmosphere, and
that they still perform according to their marked strength.
Immediately after unloading the item should be inspected for compliance with specifications and
damage in shipment.
Compliance with specification check shall as a minimum comprise size, pressure class, etc.
Damage in shipment check shall as a minimum comprise: coating, seating and sealing surfaces,
etc. or accessories or any other evidence of mishandling during shipment.
Each item should be operated through one complete open-close cycle in the position in which it
is to be installed.
Storage shall be under dry, cool conditions, away from direct sunlight and corrosive or otherwise
chemically active atmosphere.
8. Installation and commissioning
WARNING: Prior to installation make sure that all pressurized lines involved in the installation
are isolated, depressurized and drained before starting any work. Failure to do so may result in
sudden pressure release and subsequent severe injury or death.
8.1 General safety instructions
Prior to installation, a check of the valve labelling and marking must be made to ensure that the
correct valve is being installed. Record the valve serial number and its location to help with
traceability.
The valve shall be handled with great care not damaging the coating to avoid the risk of external
corrosion.
Extra care shall be taken to make sure outside coating is intact or the use of other means of
additional protection shall be used when the valve is installed in polluted or aggressive soil
conditions or coastal environments. Alternatively, the frequency of inspections shall be
increased to detect any corrosion.
Before installing and commissioning the valve shall be examined for damaged coating. If the
coating is damaged repair is required. AVK can supply a coating repair kit.

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Copyright © AVK Holding A/S, original version, rev. 11, 08-Mar-2022
The valve should be fully opened and closed to ensure it is operating satisfactorily. Valves are
precision manufactured items and as such, should not be subjected to misuse such as careless
handling or allowing dirt to enter the valve through the end ports. Excessive forces during
installation and operation must be avoided. All special packaging materials must be removed.
When valves are provided with lifting lugs or eye nuts, these should be used to lift the valve.
These lugs are designed to take the weight of the valve only and not any attached pipe work
etc. Valves should not be lifted using the handwheel or stem. During lifting all applicable Health
& Safety requirements should be observed.
Immediately prior to valve installation, the pipework to which the valve is fastened should be
checked for cleanliness and freedom from debris.
Valve end protectors should only be permanently removed immediately before installation. The
valve interior should be inspected through the end ports to determine whether it is clean and
free from foreign matter.
The mating flanges (both valve and pipework flanges) should be checked for correct gasket
contact face, surface finish and condition. If a condition is found which might cause leakage, no
attempt to assemble should be made until the condition has been corrected.
The gasket should be suitable for operation conditions or maximum pressure/temperature
ratings and should be checked to ensure freedom from defects or damage.
Care should be taken to provide correct alignment of the flanges being assembled. It is
important when installing any valve that pipeline stresses are kept to a minimum and no undue
external forces are placed on the valve connections. During assembly, the bolts must be
tightened sequentially to make the initial contact of flange and gasket flat and parallel followed
by gradual and uniform tightening to the specified torque for the gasket being used in an
opposite bolting sequence to avoid bending one flange relative to the other, particularly on
flanges with raised faces.
Parallel alignment of flanges is especially important in the case of the assembly of a valve into
an existing system.
The bolting used for the flange connection must be checked for correct size, length, material
and that all connection flange bolt holes are utilized.
If a permanent extension spindle and road cover is used only a permanent telescopic extension
spindle that is not completely collapsed (shall be extracted e.g. min. 50 mm) shall be used to
avoid transfer any loads to the buried valve.
8.2 Fields of application
Valves are permitted for use with Group 2, liquids. As standard they are suitable for drinking
water and neutral liquids. If the valve is to be operated under deviating operating conditions and
in other fields of application, the manufacturer must be consulted.
Prior to use on any other fluid the compatibility of the valve materials must be verified.
Valves are designed for ‘end of line’ service. Although in the event of the valve being mounted
at the end of the pipeline, we strongly advise the use of a blanking plate.
Valves are not suitable for fatigue loading, creep conditions, wind and earthquake loading, fire
testing, fire hazard environment, corrosive or erosive service, transporting fluids with abrasive
solids.

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Copyright © AVK Holding A/S, original version, rev. 11, 08-Mar-2021
It is the responsibility of the end user to ensure the integrity of the valve is not adversely
affected by the surrounding environment. If there is any doubt the user must implement checks
to monitor the product integrity.
The valves referred to in this document have been categorized in accordance with the Pressure
Equipment Directive.
Maximum Allowable Pressure
PS (bar)
Nominal Size DN
Category
16
400 –600
I
25
250 –600
I
Categories I require CE mark.
8.2.1 CE marking and the pressure equipment directive 2014/68/EU
Valves with a maximum allowable pressure not exceeding 0.5 bar are outside the scope of the
directive. Valves are categorized in relation to the intended fluid contents, the maximum working
pressure and the nominal size. Fluids are classified as Group 1, dangerous substances, Group
2, all other fluids including steam.
Categories are SEP (sound engineering practice) and for ascending levels of hazard, I, II, III or
IV. Valves designated as SEP do not bear the CE mark and do not require a Declaration of
Conformity.
Valves classified as category I, II, III or IV carry the CE mark and require a Declaration of
Conformity (Note: All valves up to and including DN200 having a maximum allowable pressure
less than or equal to 10 bar and where PS x DN ≤ 5000 are designated SEP).
8.3 Position of installation
It should be considered at the design stage where valves will be located to give access for
operation, adjustment, maintenance and repair.
Valves must be provided with adequate support. Adjoining pipework must be supported to avoid
the imposition of pipeline strains on the valve body, which would impair its performance.
The valve shall be installed in piping systems designed with compensators according to
standard practice and norms designed to absorb axial pipe movements due to temperature
expansion or contraction.
A heavy valve may need independent support or anchorage.
If the valve is installed in rock or sharp-edged stone, there shall be a bed of earth, sand or other
suitable material to a minimum depth of 150 mm beneath the valve. Fine-grade (< 5 mm)
material free from sharp-edged stones shall be filled and compacted carefully around the side of
the valve and to a minimum consolidated height of 150 mm above the valve.

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Copyright © AVK Holding A/S, original version, rev. 11, 08-Mar-2022
The below installed positions are allowed:
The below installed positions aren’t allowed:

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Copyright © AVK Holding A/S, original version, rev. 11, 08-Mar-2021
To ensure proper function and long service life of the valve, do not install closer than 5 times
pipe diameters downstream of tees or elbows or other irregularities as this can cause violent
turbulence and cavitation inside the valve that reduces its performance and durability.
9. Application hazards
Valves must only be installed in a piping system whose pressure and temperature do not
exceed its nominal pressure (PN) and temperature range of -10 °C to +70 °C;
If system testing will subject the valve to pressures more than the working pressure rating, this
should be within the production test pressure for the valve.
The maximum allowable pressure as specified is for non-shock conditions. Water hammer and
impact for example, should be avoided.
The maximum permissible flow velocity is according to EN1074-1. In addition to this, the valve
may be operated at flow velocities of up to 5 m/s irrespective of the pressure level.
If the limits of use specified in these instructions are exceeded or if the valve is used on
applications for which it was not designed, a potential hazard could result.
10. Operation and maintenance
10.1 Operation
10.1.1 Requirements from local authorities
Requirements from local authorities shall be met.
In case of conflicts between local requirements and PED, AVK shall be contacted to resolve any
issues.
10.1.2 Product life cycle
The life of the valve is dependent upon its installation and application.

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Copyright © AVK Holding A/S, original version, rev. 11, 08-Mar-2022
The valve should be protected from the adverse effects of mechanical shock, loading and
excess weight. This includes forces either applied to it or via the installation process or pipework
that the valve is attached. Also, consideration should be given to various loadings, which can
occur at the same time.
The valve on no account should be tampered with or modified in any way.
If for any reason work is to be carried out on the valve it is wholly the responsibility of the user to
ensure the valve is depressurized and rendered safe prior to any fasteners / fixings being
loosened.
To ensure correct installation of the valve it is essential that the personnel carrying out the
installation have corrected training and skills.
10.1.3 Operating pressure and temperature
End configuration: Flanged
Size Range: 80 mm to 600 mm
Maximum Working Pressure: Standard PED applications 10, 16 or 25 bar
Temperature Range: -10 °C to +70 °C
10.1.4 Visual inspection
Before putting the valve into operation, all functional parts must be subjected to visual
inspection. Checked the proper functioning of the valve by opening and closing it a few times.
Before putting a new installation into pipeline and especially after preparation works, open the
valves completely and purge the pipeline system.
Caution: Purge the newly installed pipe systems in order to remove any foreign particles.
Residues and dirt particles in the pipeline have the negative effect on the function of the valve or
even block it completely.
10.1.5 Function check and pressure test
After installation, check the valve for ease of operation moving it over the whole travel by the
hand wheel or actuator. When closed, the valve must only be exposed to pressures not
exceeding its nominal pressure (9.1.3). When the pipeline pressure test is performed during
which the test pressure exceeds the permissible normal pressure in the closing direction of the
valve, the pressure compensation must be effected via a bypass.
Caution: The valves are designed to be operated by a person via a hand wheel. Extension for
operation are not admitted as they may cause damages on the valve by over tension. The 90º
movement of shaft is limited by a limit stop in the gearbox, excessive forced movement beyond
the limits will cause damage.
10.2 Maintenance
WARNING: Prior to any maintenance work that requires disassembly make sure that the
pressurized line involved is isolated, depressurized and drained before starting any

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Copyright © AVK Holding A/S, original version, rev. 11, 08-Mar-2021
disassembly. Failure to do so may result in sudden pressure release and subsequent severe
injury or death.
10.2.1 General instructions
The valve is designed to give long trouble free service without the need of routine maintenance.
The wear inside the valve shall be examined at least once a year. Under extreme operating
conditions inspection should be done at shorter intervals.
If the wear is extensive worn components shall be replaced or a new valve shall be installed.
If internal or external leakage is suspected, it is recommended that AVK be contacted to
suggest suitable remedial action.
9.2.2 Gear box/actuator operated valve
Actuators (gear and electric/pneumatic actuators) are designed for flow velocities according to
EN1074-1 Table 2 (valves for water supply). Any deviation in these operating conditions must
be specified prior to order placement. Adjustment of the limit stops (open / close) must not be
changed without the manufacturer’s approval. If the valve is installed without gear units, it must
be ensured that the valve is not pressurized.
•Pressure rating PN 6: 2.5 m/s
•Pressure rating PN 10: 3 m/s
•Pressure rating PN 16: 4 m/s
•Pressure rating PN 25: 5 m/s
For detailed information on gears and actuators, please see the operation manuals issued by
the manufacturer of these components.
10.2.3 Inspection and operation intervals
•At least once a year, the valve must be inspected for tightness, proper operation and
corrosion protection.
•In case of extreme operating conditions, such inspection is required more frequently.
•The body seal can be replaced, if required, depending on the type of fluid conveyed.
10.3 Repair of parts
When the valve stops functioning properly it may be necessary to take it apart for repair:
•Please take care that the shaft is fixed by seal housing, don’t let the shaft out from the
body.
•If you need to take down the valve from the pipe, please operate full open the valve,
because the internal parts will interference with the pipe flange.

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Copyright © AVK Holding A/S, original version, rev. 11, 08-Mar-2022
10.3.1 Replacing the O-rings in seal housing
DN200-600 DN400,600
•Isolate the valve, depressurize and drain the pipeline
•Open the plunger valve and remove the gearbox
•Unscrew the bolts (part 31) and remove the seal housing (part 30)
•Clean the parts thoroughly
•Replace the O-rings (part 29 and 33) and slightly grease them with drinking water
approval lubricant
•Reassemble in reverse order, tighten the bolts (part 31), the tighten torque see 9.3.3
•Re-install the gearbox, tight the gear box nut, the tighten torque see 9.3.3
•Re-adjust the limit stops of the gearbox, see the O&M of producer
DN80-150
•Isolate the valve, depressurize and drain the pipeline
•Open the plunger valve and remove the gearbox
•Unscrew the bolts (part 26) and remove the seal housing (part 24)
•Clean the parts thoroughly
•Replace the O-rings (part 23 and 25), and slightly grease them with drinking water
approval lubricant
•Reassemble in reverse order, tighten bolts (part 26), the tighten torque see 9.3.3
•Re-install the gearbox, tight the gear box nuts, the tighten torque see 9.3.3
•Re-adjust the limit stops of the gearbox, see the O&M of producer

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Copyright © AVK Holding A/S, original version, rev. 11, 08-Mar-2021
10.3.2 Replacing the main rubber seal and O-ring in retaining ring
DN200-600 DN400,600
•Isolate the valve, depressurize and drain the pipeline
•Full open the plunger valve
•Remove the pipe flange bolts and take down the valve
•Unscrew the bolts (part 1) and remove the parts of part 1,2,3,4,5
•Clean the parts thoroughly
•Replace the main rubber seal (part 4) and O-ring (part 5), there is no need to use
lubricant for the main rubber seal
•Reassemble in reverse order, tighten bolts (part 1), the tighten torque see 9.3.3
•Re-adjust the limit stops of the gearbox, see the O&M of producer
DN80-150
•Isolate the valve, depressurize and drain the pipeline
•Full open the plunger valve
•Remove the pipe flange bolts and take down the valve
•Unscrew the bolts (part 1) and remove the parts of part 1,2,3,4,5
•Clean the parts thoroughly
•Replace the main rubber seal (part 5) and O-ring (part 4), there is no need to use
lubricant for the main rubber seal
•Reassemble in reverse order, tighten bolts (part 1), the tighten torque see 9.3.3
•Re-adjust the limit stops of the gearbox, see the O&M of producer

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Copyright © AVK Holding A/S, original version, rev. 11, 08-Mar-2022
10.3.3 Tightening torque for the screws as the table shows
M6
M8
M10
M12
M16
M20
Bolts in
valve
11 Nm
28 Nm
40 Nm
48 Nm
85 Nm
/
Nuts to
gearbox
/
/
40 Nm
48 Nm
85 Nm
163
10.4 Disposal and recycling
Even though AVK. Valves are designed and built to be extremely long-lasting, at the end of their
life cycle they must be removed and replaced. Dismantle the valve, separate its components to
dispose them of and recycle them (e.g. metal parts must be separated from plastic parts etc.).
Please, always respect the directives on waste collection, disposal and recycling.
Carefully observe all steps listed in National Laws on waste disposal and recycling.
11. Trouble shooting
Symptom:
The valve makes noises
Cause:
The valve may have been installed close to other valves, elbows, tees or other
equipment
/Valve operating beyond the design limits
Action:
Change installation position and keep more than 5 pipe diameters of other
valves, elbows, tees or other equipment. (see: 7.3 Position of installation)
/Check design and/or operation data
Symptom:
Valve cannot be operated
Cause:
Foreign particle in the seat area
/ Gear blocked;
/ Electric actuator not connected to power supply
Action:
Flush valve; if required, disassemble valve and remove foreign object;
/ Dissolving the blockage;
/ Connect to power supply.
Symptom:
Leaks in the body seat
Cause:
Valve not completely closed
/ Valve sealing damaged or worn
/ Foreign particle in the seat area
Action:
Close valve completely
/ Replace sealing ring
/ Flush valve; if required, disassemble valve and remove foreign object

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Copyright © AVK Holding A/S, original version, rev. 11, 08-Mar-2021
Symptom:
Desired flow volume is not reached
Cause:
Operational data have been changed
/Dimensions of perforated or slotted trim too small
/ Foreign particle in perforated or slotted trim
Action:
Check design and operational data; if required, change resistance in valve by
using other internals
/ Flush valve; if required, disassemble valve and remove foreign object
Symptom:
Desired back pressure or the flow volume too high
Cause:
Operational data have been changed
/Dimensions of perforated or slotted trim too large
Action:
Check design and operational data; if required, change resistance in valve by
using other internals
Symptom:
Cavitation in valve
Cause:
Valve beyond design limits
/Operational data have been changed
Action:
Check design and operational data; if required, change resistance in valve by
using other internals
12. Recommended spare parts
Only genuine AVK spare parts should be used.
AVK accepts no responsibility for damage caused by failing non-AVK parts.
Following spare parts are recommended to purchase with a ser.870 valve:
DN200 to DN600:
1. O-Ring of part 5; 10; 29 and 33
2. Main rubber Seal of part 4
3. Etc.
DN80 to DN150:
1. Ring of part 4; 8; 23 and 25
2. Main rubber Seal of part 5
3. Etc.