Operating and installation instructions
3-way control valves - STEVI® 450 / 451
Series 450 Series 451
Contents
1.0 General information on operating
instructions .....................................................2
2.0 Notes on possible dangers............................ 2
2.1 Significance of symbols ..........................................2
2.2 Explanatory notes on safety information .................2
3.0 Storage and transport ................................... 2
4.0 Description...................................................... 3
4.1 Scope of applications ..............................................3
4.2 Operating principles ................................................3
4.3 Diagram...................................................................4
4.3.1 Mixing plug design .............................................4
4.3.2 Diverting plug design ..........................................5
4.4 Technical data .........................................................6
4.5 Marking ...................................................................6
5.0 Installation....................................................... 7
5.1 General notes on installation...................................7
5.2 Requirements at the place of installation ................8
5.3 Installation instructions concerning actuators .........8
6.0 Putting the valve into operation....................9
7.0 Care and maintenance................................... 9
7.1 Replacement of stem sealings ............................... 9
7.1.1 PTFE V-ring unit design .................................... 9
7.1.2 Stuffing box packing design ............................. 10
7.1.3 Bellows seal design ..........................................11
7.1.3.1 Bellows seal and mixing plug ......................11
7.1.3.2 Bellows seal and diverting plug................... 13
7.2 Replacement of internal parts ............................ 15
7.2.1 Mixing plug design .......................................... 15
7.2.2 Diverting plug design ...................................... 17
7.3 Tightening torques................................................ 19
7.3.1 Tightening torques for hexagon nuts (bonnet) 19
7.3.2 Tightening torques for hexagon nuts (plug) .... 19
7.3.3 Tightening torques for seat rings ..................... 19
8.0 Troubleshooting ........................................... 19
9.0 Troubleshooting table ................................. 20
10.0 Dismantling the valve or the top part ...... 21
11.0 Warranty / Guarantee ................................. 21
12.0 EC declaration of conformity.................... 22
Rev. 0040306000 0410 englisch
Operating and installation instructions
®
3-way control valves - STEVI
450 / 451
1.0 General information on operating instructions
These operating instructions provide information on mounting and maintaining the fittings.
Please contact the supplier or the manufacturer in case of problems which cannot be
solved by reference to the operating instructions.
They are binding on the transport, storage, installation, start-up, operation, maintenance
and repair.
The notes and warnings must be observed and adhered to.
- Handling and all work must be carried out by expert personnel or all activities must be
supervised and checked.
It is the owner’s responsibility to define areas of responsibility and competence and to
monitor the personnel.
- In addition, current regional safety requirements must be applied and observed when
taking the fittings out of service as well as when maintaining and repairing them.
The manufacturer reserves the right to introduce technical modifications at any time.
These Operating Instructions comply with the requirements of EU Directives.
2.0 Notes on possible dangers
2.1 Significance of symbols
ATTENTION !
. . .
Warning of general danger.
2.2 Explanatory notes on safety information
In these Operating and Installation Instructions dangers, risks and items of safety
information are highlighted to attract special attention.
Information marked with the above symbol and “ATTENTION ! ” describe practices, a
failure to comply with which can result in serious injury or danger of death for users or third
parties or in material damage to the system or the environment. It is vital to comply with
these practices and to monitor compliance.
All other information not specifically emphasised such as transport, installation, operating
and maintenance instructions as well as technical data (in the operating instructions,
product documentation and on the device itself) must also be complied with to the fullest
extent in order to avoid faults which in turn can cause serious injury to persons or damage
to property.
3.0 Storage and transport
ATTENTION !
- Protect against external force (like impact, vibration, etc.).
- Valve mountings such as actuators, handwheels, hoods must not be used to
take external forces, e.g. they are not designed for use as climbing aids, or as
connecting points for lifting gear.
- Suitable materials handling and lifting equipment should be used.
See catalog sheet for weights.
- At -20°C to +65°C.
- The paint is a base coat to protect against corrosion during transportation and storage. Do
not damage paint protection.
Page 2 Rev. 0040306000 0410
Operating and installation instructions
®
3-way control valves - STEVI
450 / 451
4.0 Description
4.1 Scope of applications
Valves are used for „controlling the flow of liquids, gases and vapours in chemical and other
processing plants and for plant engineering“.
ATTENTION !
- Refer to the data sheet for applications, limits on use and possibilities.
- Certain media require or preclude the use of special materials.
- The valves are designed for standard operating conditions. If conditions exceed
these requirements, e.g. aggressive or abrasive media, the operator should
state the higher requirements when ordering.
- Valves made from grey cast iron are not authorised for use in systems subject
to TRD 110.
The information complies to the Pressure Equipment Directive 97/23/EC.
It is the responsibility of the machine planner to ensure compliance.
The special markings on the valve must be taken into account.
Refer to the catalogue sheet to see which materials are used in standard versions.
Please contact the supplier or the manufacturer if you have any questions.
4.2 Operating principles
ARI control valves are especially suitable for actuation by pneumatic or electrical actuators.
Depending on the mode of operation, two different execution methods are possible:
1. Execution with mixing plug
2. Execution with diverting plug
The execution with the mixing plug is the standard execution method.
This execution method is to be chosen when the valve is also employed as a mixer
(2 entrances, 1 exit).
In exceptional cases, the execution with the mixing plug can also be employed as a
diverting plug (1 entrance, 2 exits). This requires, however, low differential pressures and
stable propulsion.
The execution method with the diverting plug is only to be employed with the operation of
diverting.
Explanation:
Mixing operation Diverting operation
AB
B
A
Rev. 0040306000 0410 Page 3
AB A
B
4.3 Diagram
4.3.1 Mixing plug design
Operating and installation instructions
®
3-way control valves - STEVI
450 / 451
Fig. 1: Series 450 DN15-150 Fig. 2: Series 451 DN15-150
Fig. 3: Series 450 DN125v-150v Fig. 4: Series 451 DN125v-150v
Page 4 Rev. 0040306000 0410
4.3.2 Diverting plug design
Operating and installation instructions
®
3-way control valves - STEVI
450 / 451
Fig. 5: Series 450 DN15-150 Fig. 6: Series 451 DN15-150
Fig. 7: Series 450 DN125v-150v Fig. 8: Series 451 DN125v-150v
Rev. 0040306000 0410 Page 5
Operating and installation instructions
3-way control valves - STEVI
4.4 Technical data
for
- Principal dimensions
- Pressure-temperature-ratings, etc. refer to datasheet.
4.5 Marking
®
450 / 451
Kvs-value
Plug
design
Type-Number
Material of
internal parts
Nominal diameter
Flow
characteristic
Nominal pressure
Serial-No.
Year of manufacture clear speech
(1. and 2. position)
Manufacturer
CE-marking
Notified body
Customer-specific
information
Stem sealing
Fig. 9
Address of manufacturer: refer to item 11.0 Warranty / Guarantee
According to the Pressure Equipment Directive table 6, annex II, valves without safety
function are only allowed to bear the CE-marking DN32 onwards.
Page 6 Rev. 0040306000 0410
Operating and installation instructions
®
3-way control valves - STEVI
450 / 451
5.0 Installation
5.1 General notes on installation
The following items should be taken into account besides the general principles governing
installation work:
ATTENTION !
- Remove flange covers if present.
- The interior of valve and pipeline must be free from foreign particles.
- Note installation position with reference to flow, see mark on valve.
- Steam line systems should be designed to prevent water accumulation.
- Lay pipelines so that damaging transverse, bending and torsional forces are
avoided.
- Protect valves from dirt during construction work.
- Connection flanges must mate exactly.
- Connecting bolts for pipe flanges should be mounted preferably from the
counter flange side (hexagon nuts from the valve side).
- Valve mountings such as actuators, handwheels, hoods must not be used to
take external forces, e.g. they are not designed for use as climbing aids, or as
connecting points for lifting gear.
- Suitable materials handling and lifting equipment should be used.
Refer to data sheet for weights.
- Keep the thread and shaft of the stem free from paint.
- Centre gaskets between the flanges.
- Strainers or filters should be installed before the valves.
- Planners / construction companies or operators are responsible for positioning and
installing products.
- The valves are designed for application, not influenced from weather.
- For application outside or in adverse environments like corrosion-promoting conditions
(sea water, chemical vapours, etc.), special constructions or protective measures are
recommended.
Rev. 0040306000 0410 Page 7
Operating and installation instructions
®
3-way control valves - STEVI
450 / 451
5.2 Requirements at the place of installation
The place of installation should be easily accessible and provide ample space for
maintenance and removing the actuator. Stop valves should be installed before and behind
the control valve to enable maintenance working without draining the piping system. The
valve should preferably installed vertically with the actuator at the top. Inclined or horizontal
installation without supports is permissible only with light actuators.
For this installation position, the two distance columns (or joke) have to be above each
other in the vertical plane.
Fig. 10: Pipeline vertically Fig. 11: Pipeline horizontally
Safe actuator weights for a horizontal installation position with reference to the stem,
without structural support, are as follows:
20 kg for DN 15 - 32
25 kg for DN 40 - 65
35 kg for DN 80-100
40 kg for DN125-150
55 kg for DN125v-150v
The pipes must be lagged to protect the actuators from excessive heat. Sufficient space
must be left for the maintenance of the stem packing.
To ensure that the control valves function correctly, the pipe run should be straight for at
least 2 x DN upstream and 6 x DN downstream of the valve.
5.3 Installation instructions concerning actuators
Normally, control valves are supplied complete with actuator fitted.
It is not permitted to mantle / dismantle actuators with valves operating at service conditions
(temperature and pressure) the actuators must be assembled as describe in the operating
instructions during conversion and maintenance.
During assembly work, the plug is not be turned on its seatring at closing pressure.
ATTENTION !
Care must be taken with the bellow type valves when actuators are mounted or
removed. (Hold the valve-stem against turning with an open-end wrench!)
When retrofitting actuators, the maximum permissible force for valve actuation must be
taken into account:
Series 450 Series 451
12 kN for DN 15- 50 18 kN for DN 15-100
29 kN for DN 65-100 37 kN for DN125-150 / 125v-150v
40 kN for DN125-150
59 kN for DN125v-150v
Page 8 Rev. 0040306000 0410
Operating and installation instructions
3-way control valves - STEVI
6.0 Putting the valve into operation
ATTENTION !
- Before putting the valve into operation, check material, pressure, temperature
and direction of flow.
- Regional safety instructions must be adhered to.
- Residues in piping and valves (dirt, weld beads, etc.) inevitably lead to leakage.
- Touching the valve when it is operating at high (> 50 °C) or low (< 0 °C) media
temperatures can cause injury.
Affix warning notice or protective insulation as appropriate!
Before putting a new plant into operation or restarting a plant after repairs or
modification, always make sure that:
- All works has been completed!
- The valve is in the correct position for its function.
- Safety devices have been attached.
7.0 Care and maintenance
®
450 / 451
Maintenance and maintenance intervals have to be defined by the operator according to
the service conditions.
7.1 Replacement of stem sealings
7.1.1 PTFE V-ring unit design
PTFE V-ring unit (pos. 12) consisting of: 1 backing ring
4 sealing rings
1 cover ring
Owing to the installed compression spring (pos. 14), this
stem packing is self-adjusting. If the stem starts leaking, the
ring pack is worn out and must be replaced.
Replacement PTFE V-ring unit:
ATTENION !
Refer to point 10.0 and 11.0 before
dismantling the valve.
- Remove actuator.
(Refer to operating instructions for actuator!)
- When replacing V-ring unit (pos. 12), make sure that the
parts are installed in the correct order and positions
(refer to Fig. 12).
- Gasket (pos. 17) must be replaced.
Damaged stems must also be replaced (refer to point 7.2
for instructions) since a new sealing will soon start leaking
again if the stem is damaged.
Rev. 0040306000 0410 Page 9
Fig. 12:
Installation V-ring unit
DN15-150
Operating and installation instructions
®
3-way control valves - STEVI
7.1.2 Stuffing box packing design
The stuffing box packing requires maintenance.
If leaks develop, immediately tighten the screw joint (pos. 42) respectively the hexagon nuts
(pos. 24) gradually until the packing ring (pos. 13) stops leaking.
The service life of stuffing box packings (pos. 13) can be increased by checking regularly
leakage.
If leaks can no longer be stopped by tightening the screw joint (pos. 42) respectively the
nuts (pos. 24), a new packing ring (pos. 13) must be inserted into the gland.
Replacement of stuffing box packings:
ATTENION !
Refer to point 10.0 and 11.0 before dismantling the valve.
- Remove actuator. (Refer to operating instructions for actuator!)
- Insert new packing ring as shown in the Fig. 13 and Fig. 14.
450 / 451
Fig. 13: Stuffing box packing DN15-150 Fig. 14: Stuffing box packing DN125v-150v
If a split packing ring is used, cut with a chamfer
as shown in Fig. 15.
Fig. 15: Split packing ring
Damaged stems must also be replaced (refer to point 7.2 for instructions), since a new
sealing will soon start leaking again if the stem is damaged.
Page 10 Rev. 0040306000 0410
Operating and installation instructions
®
3-way control valves - STEVI
7.1.3 Bellows seal design
If the stem leaks the bellows seal (pos. 20.3) is defective. The leak can initially be stopped
by tightening the screw joint (pos. 20.17) respectively the sleeve nut (pos. 20.16).
Stem and bellows (pos. 20.3) can only be replaced together.
Replacement of bellows seal:
ATTENION !
Refer to point 10.0 and 11.0 before dismantling the valve.
- Remove actuator. (Refer to operating instructions for actuator!)
- Slacken screw joint (pos. 20.17) respectively sleeve nut (pos. 20.16) by about one turn.
- Unscrew the bottom seat ring (pos. 2) (refer to point 7.2) with diverting plug version (Fig. 18, Fig. 19) not necessary.
- Unscrew hexagon nut (pos. 4 or pos. 60), (holding against spanner face).
- Remove plug (pos. 3 or 31).
7.1.3.1 Bellows seal and mixing plug
450 / 451
DN15-150
- Dismantle as point 7.1.3.
- Loose nuts (pos. 11).
- Detach bellows assembly (pos. 20).
- Loose nuts (pos. 20.8).
- Detach mounting bonnet (pos. 20.2).
- Extract stem-/bellows unit (pos. 20.3) from the bellows
housing (pos. 20.1).
- Drive pin (pos. 6) out with a drift.
- Unscrew stem adapter (pos. 37).
Note:
Adapter (pos. 37) and straight pin (pos. 6) are not existing at
DN40-50.
- Bolt new parts together, drill and pin them.
- Replace 2 gaskets (pos. 20.6) and 1 gasket (pos. 9).
- Assemble in reverse order.
(For tightening torques refer to item 7.3.)
ATTENTION at DN125-150!
- Ensure that the torsion lock is correctly
positioned when inserting new stem/bellows
unit. Introduce the grooved pin (pos. 20.9) into
the torsion lock groove.
Make sure it runs smoothly!
- Secure with nuts (pos. 11 and 20.8) and tighten them
crosswise. (For tightening torques refer to item 7.3.)
- Tighten screw joint (pos. 20.17) gradually up to tightness of
the stuffing box packing (pos. 20.10).
Rev. 0040306000 0410 Page 11
Fig. 16:
Series 451 DN 15-150
with mixing plug
Operating and installation instructions
3-way control valves - STEVI
DN125v-150v
- Dismantle as point 7.1.3.
- Loose nuts (pos. 29).
- Detach bellows assembly (pos. 20).
- Loose nuts (pos. 20.8).
- Detach stuffing box housing (pos. 20.13).
- Extract stem-/bellows unit (pos. 20.3) from the
bellows housing (pos. 20.1).
- Drive pin (pos. 6) out with a drift.
- Unscrew stem adapter (pos. 37).
- Bolt new parts together, drill and pin them.
- Replace 2 gaskets (pos. 20.6) and 1 gasket
(pos. 27).
- Assemble in reverse order.
(For tightening torques refer to item 7.3.)
ATTENTION !
- Ensure that the torsion lock is
correctly positioned when inserting
new stem/bellows unit. Introduce the
grooved pin (pos. 20.9) into the
torsion lock groove.
Make sure it runs smoothly!
®
450 / 451
- Secure with nuts (pos. 29 and 20.8) and tighten
them crosswise.
(For tightening torques refer to item 7.3.)
- Tighten sleeve nut (pos. 20.16) gradually up to
tightness of the stuffing box packing
(pos. 20.10).
Fig. 17:
Series 451 DN125v-150v
with mixing plug
Page 12 Rev. 0040306000 0410
Operating and installation instructions
3-way control valves - STEVI
7.1.3.2 Bellows seal and diverting plug
DN40-150
- Dismantle as item 7.1.3.
- Pull distance bush (pos. 32) from adapter (pos. 38).
Note:
There is no distance bush (pos. 32) on DN 125-150.
- Loose nuts (pos. 11).
- Detach bellows assembly (pos. 20).
- DN 15-100: Pull plug (pos. 40) from adapter
(pos. 38).
- DN 125-150: Drive straight pin (pos. 33) out with a
drift. Screw plug (pos. 40) from adapter (pos. 38).
- Loose nuts (pos. 20.8).
- Detach mounting bonnet (pos. 20.2).
- Extract stem-/bellows unit (pos. 20.3) from the
bellows housing (pos. 20.1).
- Drive pin (pos. 6) out with a drift.
- Unscrew stem adapter (pos. 38).
®
450 / 451
Note:
Adapter (pos. 38) and straight pin (pos. 6) are not
existing at DN40-50.
- Bolt new parts together, drill and pin them.
- Replace 2 gaskets (pos. 20.6) and 1 gasket
(pos. 9).
- Assemble in reverse order.
(For tightening torques refer to item 7.3.)
ATTENTION at DN125-150!
- Ensure that the torsion lock is correctly
positioned when inserting new stem/
bellows unit. Introduce the straight pin
(pos. 20.9) into the torsion lock groove.
Make sure it runs smoothly!
- Secure with nuts (pos. 11 and 20.8) and tighten
them crosswise.
(For tightening torques refer to item 7.3.)
- Tighten screw joint (pos. 20.17) gradually up to tightness of the stuffing box packing
(pos. 20.10).
Fig. 18:
Series 451 DN15-150
with diverting plug
Rev. 0040306000 0410 Page 13
Operating and installation instructions
3-way control valves - STEVI
DN125v-150v
- Dismantle as item 7.1.3.
- Loose nuts (pos. 11).
- Detach bellows assembly (pos. 20) incl.
stuffing box housing (pos. 39).
- Drive pin (pos. 33) out with a drift.
- Unscrew plug (pos. 40) from adapter (pos. 38).
- Loose nuts (pos. 29).
- Detach bellows assembly (pos. 20).
- Loose nuts (pos. 20.8).
- Detach stuffing box housing (pos. 20.13).
- Extract stem/bellows unit (pos. 20.3) from the
bellows housing (pos. 20.1).
- Drive pin (pos. 6) out with a drift.
®
450 / 451
- Unscrew stem adapter (pos. 38).
- Bolt new parts together, drill and pin them.
- Replace 2 gaskets (pos. 20.6) and each
1 gasket (pos. 27, 9).
- Assemble in reverse order.
(For tightening torques refer to item 7.3.)
ATTENTION !
- Ensure that the torsion lock is
correctly positioned when inserting
new stem/bellows unit. Introduce the
straight pin (pos. 20.9) into the
torsion lock groove.
Make sure it runs smoothly!
- Secure with nuts (pos. 29 and 20.8) and
tighten them crosswise.
(For tightening torques refer to item 7.3.)
- Tighten sleeve nut (pos. 20.16) gradually up to
tightness of the stuffing box packing
(pos. 20.10).
Fig. 19:
Series 451 DN125v-150v
with diverting plug
Page 14 Rev. 0040306000 0410
Operating and installation instructions
®
3-way control valves - STEVI
450 / 451
7.2 Replacement of internal parts
ATTENION !
Refer to item 10.0 and 11.0 before dismantling the valve.
- Remove actuator. (Refer to operating instructions for actuator!)
A special wrench is needed to remove the seatring (pos. 2). It can be obtained from the
manufacturer.
When fitting a new or reconditioned seatring, clean thread and sealing taper in body and
apply suitable lubricant.
Item 7.1.3 describes how to change the plug and stem in valves with a bellow seal
(series 451).
7.2.1 Mixing plug design
DN15-150
- Unscrew seat ring (pos. 2 bottom) and renew or
recondition.
- Slacken screw joint (pos. 19 or 42) by about 1 turn.
- Extract and replace plug (pos. 3) and stem (pos. 5).
Note:
DN 125-150: Bolt new parts together, drill and pin them.
- Assemble in reverse order.
(For tightening torques refer to item 7.3.)
The top seat ring can only be replaced in:
DN 125-150 with standard Kvs values
DN 15-150 with multiple reduced Kvs values
- Dismantle seat ring, plug and stem as described above.
- Loose nuts (pos. 11).
- Detach mounting bonnet (pos. 7).
- Unscrew seat ring (pos. 2 top) and renew or recondition.
(For tightening torques refer to item 7.3.)
- Replace gasket (pos. 9).
- Assemble in reverse order.
(For tightening torques refer to item 7.3.)
- Secure with nuts (pos. 11) and tighten them crosswise.
(For tightening torques refer to item 7.3.)
(bottom)
Fig. 20:
Series 450 DN15-150
with mixing plug
Rev. 0040306000 0410 Page 15
Operating and installation instructions
3-way control valves - STEVI
DN125v-150v
- Unscrew seat ring (pos. 2 bottom) and renew or
recondition.
- Slacken nuts (pos. 24) by about 2-3 turns.
- Extract and replace plug (pos. 3) and stem
(pos. 5).
- Assemble in reverse order.
(For tightening torques refer to item 7.3.)
Changing the top seat ring:
- Dismantle seat ring, plug and stem as described
above.
- Loose nuts (pos. 11).
- Detach stuffing box housing (pos. 39).
- Unscrew seat ring (pos. 2 top) and renew or
recondition.
(For tightening torques refer to item 7.3.)
®
450 / 451
(top)
- Replace gasket (pos. 9).
- Assemble in reverse order.
(For tightening torques refer to item 7.3.)
- Secure with nuts (pos. 11) and tighten them
crosswise.
(For tightening torques refer to item 7.3.)
(bottom)
Fig. 21:
Series 450 DN125v-150v
with mixing plug
Page 16 Rev. 0040306000 0410
Operating and installation instructions
)
3-way control valves - STEVI
7.2.2 Diverting plug design
DN40-150
- Slacken screw joint (pos. 19 and 24) by about 1
turn.
- Loose nuts (pos. 11).
- Detach mounting bonnet (pos. 7).
- Loose nut (pos. 4 or pos. 60).
- Pull plug (pos. 31) with distance bush (pos. 32)
down.
Note:
There is no distance bush (pos. 32) in DN125-150.
- Pull plug (pos. 40) with stem (pos. 41) up and
replace.
Note:
DN125-150: Bolt new parts together, drill and pin
them.
®
450 / 451
(top)
(bottom
- Unscrew seat rings (pos. 2 bottom and top) and
renew or recondition.
(For tightening torques refer to item 7.3.)
- Replace gasket (pos. 9).
- Assemble in reverse order.
(For tightening torques refer to item 7.3.)
- Secure with nuts (pos. 11) and tighten them
crosswise.
(For tightening torques refer to item 7.3.)
Fig. 22:
Series 450 DN40-150 with diverting
plug Verteilkegel
Rev. 0040306000 0410 Page 17
Operating and installation instructions
3-way control valves - STEVI
DN125v-150v
- Loose nuts (pos. 24).
- Loose nuts (pos. 11).
- Detach stuffing box housing (pos. 39).
- Loose nut (pos. 4).
- Pull plug (pos. 31) down.
- Pull plug (pos. 40) with stem (pos. 41) up and
replace.
- Bolt new parts together, drill and pin them.
®
450 / 451
- Unscrew seat rings (pos. 2 bottom and top) and
renew or recondition
(For tightening torques refer to item 7.3.)
- Replace gasket (pos. 9).
- Assemble in reverse order.
(For tightening torques refer to item 7.3.)
- Secure with nuts (pos. 11) and tighten them
crosswise.
(For tightening torques refer to item 7.3.)
(top)
(bot.)
Fig. 23:
Series 450 DN125v-150v with div. plug
Page 18 Rev. 0040306000 0410
Operating and installation instructions
3-way control valves - STEVI
7.3 Tightening torques
7.3.1 Tightening torques for hexagon nuts (bonnet)
(Pos. 11, 29, 20.8)
M 10 = 15 - 30 Nm
M 12 = 35 - 50 Nm
M 16 = 80 - 120 Nm
M 20 = 150 - 200 Nm
7.3.2 Tightening torques for hexagon nuts (plug)
(Pos. 4) (Pos. 60)
M 10 = 50 Nm M 10 = 35 Nm
M 12 = 85 Nm M 12 = 60 Nm
M 16 = 180 Nm M 16 = 140 Nm
M 20 x 1,5 = 360 Nm M 20 x 1,5 = 270 Nm
®
450 / 451
7.3.3 Tightening torques for seat rings
(Pos. 2)
DN 15 = 150 Nm
DN 20 = 200 Nm
DN 25 = 215 Nm
DN 32 = 280 Nm
DN 40 = 400 Nm
DN 50 = 550 Nm
DN 65 = 840 Nm
DN 80 = 1170 Nm
DN100 = 1680 Nm
DN125 / 125v = 1700 Nm
DN150 / 150v = 2000 Nm
Refer to operating and installation instructions for actuator
concerned for installing actuators!
8.0 Troubleshooting
In the event of malfunction or faulty operating performance check that the installation and
adjustment work has been carried out and completed in accordance with these Operating
Instructions.
ATTENTION !
-
If malfunctions cannot be eliminate with the help of the following table
“9.0 Troubleshooting table”, the supplier or manufacturer should be consulted.
- It is essential that the safety regulations are observed when identifying faults.
Rev. 0040306000 0410 Page 19
Operating and installation instructions
®
3-way control valves - STEVI
450 / 451
9.0 Troubleshooting table
ATTENTION !
- read item 10.0 and 11.0 prior to dismantling and repair work!
- read item 6.0 before restarting the plant !
Fault Possible cause Corrective measures
No flow Valve closed Open valve (using actuator)
Flange covers not removed Remove flange covers
Little flow Valve not sufficiently open Open valve (using actuator)
Dirt sieve clogged Clean / replace sieve
Piping system clogged Check piping system
Kvs value of valve unsuitable Fit valve with higher Kvs value
Stem moves in jerks. Stuffing box sealing too tight
(for valves with graphite packings)
Valve plug slightly seized owing to solid
dirt particles
Stem or plug cannot be
moved.
Stem leaking. PTFE V-ring unit damaged or worn Replace ring pack; refer to item 7.2
Leakage too high when
valve is closed.
Stem “hammers”. flow in the closing direction Compare the plug operation (mixing- or
Seatring and plug clogged with dirt;
especially with V-port and perforated
plugs
Valve plug seized in seatring or guide
owing to deposits or dirt in medium
In valves with packed stuffing boxes
tighten screw joint (pos. 42)
Bellows defective in valves with bellow
seal
Sealing surfaces of plug eroded or worn Replace plug; refer to item 7.2
Sealing edge of seatring damages or
worn
Seatring and/or plug dirty. Clean internal parts of the valve
Pneumatic actuator not completely
vented; spring force not fully effective
Actuator not powerful enough Install more powerful actuator;
Slacken screw joint (pos. 42/20.17) or
hexagon nuts (pos. 24) slightly;
valve must not start leaking!
Clean internals, smooth rough spots.
Clean seatring and plug with suitable
solvent
Replace plug and seatring; use parts
made from different material if necessary
Tighten screw joint (pos. 42) or hex.
nuts (pos. 24); replace packing if necessary; refer to item 7.1.2
Replace bellows unit; refer to item
7.1.3
Replace seatring; refer to item 7.2
Vent actuator air chamber completely
check service data
diverting plug) with the application and
if necessary exchange the fittings or
increase actuator force
Page 20 Rev. 0040306000 0410
Operating and installation instructions
®
3-way control valves - STEVI
450 / 451
10.0 Dismantling the valve or the top part
ATTENTION !
The following points must be observed:
- Pressureless pipe system.
- Medium must be cool.
- Plant must be drained.
- Purge piping systems in case of caustic, inflammable, aggressive or toxic
media.
11.0 Warranty / Guarantee
The extent and period of warranty cover are specified in the "Standard Terms and
Conditions of Albert Richter GmbH & Co. KG" valid at the time of delivery or, by way of
departure, in the contract of sale itself.
We guarantee freedom of faults in compliance with state-of-the-art technology and the
confirmed application.
No warranty claims can be made for any damage caused as the result of incorrect handling
or disregard of operating and installation instructions, datasheets and relavant regulations.
This warranty also does not cover any damage which occurs during operation under
conditions deviating from those laid down by specifications or other agreements.
Justified complaints will be eliminated by repair carried out by us or by a specialist
appointed by us.
No claims will be accepted beyond the scope of this warranty. The right to replacement
delivery is excluded.
The warranty shall not cover maintenance work, installation of external parts, design
modifications or natural wear.
Any damage incurred during transport should not be reported to us but rather to the
competent cargo-handling depot, the railway company or carrier company immediately or
else claims for replacements from these companies will be invalidated.
Technology for the Future.
GERMAN QUALITY VALVES
ARI-Armaturen Albert Richter GmbH & Co. KG, D-33756 Schloß Holte-Stukenbrock
Telephone (+49 5207) 994-0 Telefax (+49 5207) 994-158 or 159
Internet: http://www.ari-armaturen.com E-mail: info.vertrieb@ari-armaturen.com
Rev. 0040306000 0410 Page 21
Operating and installation instructions
®
3-way control valves - STEVI
450 / 451
12.0 EC declaration of conformity
ARI-Armaturen Albert Richter GmbH & Co. KG,
Mergelheide 56-60, D-33756 Schloß Holte-Stukenbrock
declaration of conformity EC
as defined by
the Pressure Equipment Directive 97/23/EC
Herewith we declare,
that according to the above mentioned Pressure Equipment Directive (PED) the below listed products comply and have been approved according to table 6, annex II, module H through Lloyd´s Register Quality Assurance GmbH (BS-No. 0525), Am Sandtorkai 41, D-20457 Hamburg.
Certificate-No: 50003/1
3-way control valves
Type 450, 451, 423, 463, 483
Schloß Holte-Stukenbrock, 11.01.2010
Applied standard:
DIN EN 60534 part 1
VDI/VDE 3844 sheet 1
DIN 3840
AD 2000 leaflet A4
- Cast iron with spheroidal graphite
- Cast steel
- Forged steel
...................................................
(Brechmann, Managing director)
Page 22 Rev. 0040306000 0410
Loading...