Samson V2001 Series Service manual

Mounting and
Operating Instructions
EB 8135/8136 EN
Edition August 2016
Type3535 Three-way Valve with bellows seal and rod-type yoke (partial view)
Series V2001 Valves
Type3535 Three-way Valve for Heat
Transfer Oil

Denition of signal words
DANGER!
Hazardous situations which, if not
avoided, will result in death or seri-
ous injury
WARNING!
Hazardous situations which, if not
avoided, could result in death or seri-
ous injury
NOTICE
Property damage message or mal-
function
Note:
Additional information
Tip:
Recommended action

2 EB 8135/8136 EN

Contents
EB 8135/8136 EN 3
1 General safety instructions.............................................................................4
2 Design and principle of operation ..................................................................6
2.1 Technical data ...............................................................................................8
2.2 Materials.......................................................................................................8
2.3 KVS and CV coefcients, seat diameters and travel.............................................8
3 Installation....................................................................................................9
3.1 Mounting position..........................................................................................9
3.2 Arrangement of the valve ...............................................................................9
3.3 Strainer and bypass.......................................................................................9
4 Operation...................................................................................................11
5 Maintenance ...............................................................................................11
5.1 Replacing the bellows seal............................................................................12
5.1.1 Disassembly ................................................................................................12
5.1.2 Assembly ....................................................................................................13
5.2 Replacing the seat and plug..........................................................................15
5.2.1 Mixing valve................................................................................................15
5.2.2 Diverting valve.............................................................................................19
5.3 Tools and tightening torques..........................................................................22
6 Description of nameplates............................................................................23
6.1 DIN version .................................................................................................23
6.2 ANSI version ...............................................................................................23
7 Dimensions in mm and inches......................................................................24
8 Customer inquiries ......................................................................................25

4 EB 8135/8136 EN
General safety instructions
1 General safety instructions
−The control valve must be mounted, started up, or serviced by fully trained and qualied
personnel only. Make sure employees or third persons are not exposed to any danger.
All safety instructions and warnings given in these mounting and operating instructions,
particularly those concerning installation, start-up and maintenance, must be strictly ob-
served.
−The control valves comply with the requirements of the European Pressure Equipment Di-
rective 2014/68/EU. Valves with a CE marking have a declaration of conformity which
includes information about the applied conformity assessment procedure. The declaration
of conformity can be viewed and downloaded from uhttp://www.samson.de.
−To ensure appropriate use, only use the valve in applications where the operating pres-
sure and temperatures do not exceed the specications used for sizing the valve at the or-
dering stage. The manufacturer does not assume any responsibility for damage caused
by external forces or any other external factors. Any hazards that could be caused in the
valve by the process medium, the operating pressure, the signal pressure or by moving
parts are to be prevented by taking appropriate precautions.
−Proper shipping and storage are assumed.

EB 8135/8136 EN 5
General safety instructions
Note:
−For installation and maintenance, make sure the relevant section of the pipeline is depres-
surized and, depending on the process medium, drained as well. Depending on the eld
of application, allow the valve to cool down or heat up to reach ambient temperature be-
fore starting any work on it.
−When working on the valve, make sure that the pneumatic air supply or power supply as
well as the control signal are disconnected to prevent any hazards due to moving parts.
−Be particularly careful if the actuator springs of pneumatic control valves are preloaded.
Such actuators are labeled correspondingly and can also be identied by three long bolts
protruding from the bottom of the actuator. Before starting any work on the valve, relieve
the compression from the preloaded springs.

6 EB 8135/8136 EN
Design and principle of operation
2 Design and principle of oper-
ation
The Type3535 Three-way Valve has a mod-
ular design and can be combined with pneu-
matic or electric actuators (as described in
following):
Control valve Type ...
Actuator
3535-P Pneumatic 3371-01xx
3535-IP Electropneumatic 3372-03xx
3535-E1 Electric 5824-30
3535-E3 3374
Depending on the plug arrangement, the
three-way valve can be used either as a mix-
ing or diverting valve.
In mixing valves, the process media to be
mixed enter at valve ports A and B. The
combined ow exits the valve at port AB.
In diverting valves, the process medium en-
ters at the valve port AB and the partial
ows exit at ports A and B.
The ow rate from ports A or B to AB and
vice versa depends on the cross-sectional ar-
ea of ow between the seats and plugs.
The plug (3, 3.1, 3.2) is moved by changing
the control signal applied to the actuator.
The plug stem is sealed by a bellows seal
and an additional packing (4.2) and is con-
nected to the actuator stem (8.1) by the stem
connector (7).
AB AABA
BB
2.2
12.2
12
12.1
2.1
1
1.1
6
6.1
6.2
9
5.3
5
5.2
X
10.1
10.2
10.3
5.4
1.2
8.1
8.2
7
4
4.1
4.2
4.3
5.1
3.2
3.1
10.3
10.2
10.1
3.1
X
3.2
12
12.1
12.2
Fig.1: Sectional drawing DN32 to 50, plug arrangement for mixing valve (left) and diverting valve
(right)
1Valve body
1.1 Nuts
1.2 Gasket
2.1 Top seat
2.2 Bottom seat
3.1 Top plug
3.2 Bottom plug
4 Threaded bushing
4.1 Bushing
4.2 Packing (spring-load-
ed for DN65 and
larger)
4.3 Washer
5 Bellows seal with plug
stem
5.1 Coupling nut
5.2 Bellows housing
5.3 Gasket
5.4 Flange
6Plug stem
6.1 Stem connector nut
6.2 Lock nut
7 Stem connector
8.1 Actuator stem
8.2 Rod-type yoke
9Nut
10.1 Sleeve
10.2 Short sleeve
10.3 Sleeve
12 Nut
12.1 Washer
12.2 Retaining washers
XPosition for open-end
wrench

EB 8135/8136 EN 7
Design and principle of operation
2 Design and principle of oper-
ation
The Type3535 Three-way Valve has a mod-
ular design and can be combined with pneu-
matic or electric actuators (as described in
following):
Control valve Type ...
Actuator
3535-P Pneumatic 3371-01xx
3535-IP Electropneumatic 3372-03xx
3535-E1 Electric 5824-30
3535-E3 3374
Depending on the plug arrangement, the
three-way valve can be used either as a mix-
ing or diverting valve.
In mixing valves, the process media to be
mixed enter at valve ports A and B. The
combined ow exits the valve at port AB.
AB AA
BA
BB
2.2
12.2
12
12.1
2.1
1
1.1
6
6.1
6.2
9
5.3
5
5.2
X
10.1
10.2
10.3
5.4
1.2
8.1
8.2
7
4
4.1
4.2
4.3
5.1
3.2
3.1
10.3
10.2
10.1
3.1
X
3.2
12
12.1
12.2
Fig.1: Sectional drawing DN32 to 50, plug arrangement for mixing valve (left) and diverting valve
(right)
1Valve body
1.1 Nuts
1.2 Gasket
2.1 Top seat
2.2 Bottom seat
3.1 Top plug
3.2 Bottom plug
4 Threaded bushing
4.1 Bushing
4.2 Packing (spring-load-
ed for DN65 and
larger)
4.3 Washer
5 Bellows seal with plug
stem
5.1 Coupling nut
5.2 Bellows housing
5.3 Gasket
5.4 Flange
6Plug stem
6.1 Stem connector nut
6.2 Lock nut
7 Stem connector
8.1 Actuator stem
8.2 Rod-type yoke
9Nut
10.1 Sleeve
10.2 Short sleeve
10.3 Sleeve
12 Nut
12.1 Washer
12.2 Retaining washers
XPosition for open-end
wrench

8 EB 8135/8136 EN
Design and principle of operation
2.1 Technical data
Valve size DN 15 to 80 NPS½ to 3
Material
Spheroidal
graphite iron
EN-JS1049
Cast steel
1.0619
Stainless
steel
1.4408
Spheroidal
graphite
iron A395
Cast steel
A216 WCC
Stainless
steel A351
CF8M
Pressure rating PN16 · PN25 Class150 · Class300
Connection Flanges
EN1092-1 FormB1,
Ra3.2 to 12.5µm
EN1092-1, groove FormD
Raised face
Seat-plug seal Metal seal
Characteristic Linear
Rangeability 30:1 up to DN25 (NPS1) · 50:1 for DN32 (NPS1) and larger
Temperature range –10 to +350°C 14 to 660°F
Leakage class DINEN1349: 0.05% of KVS ANSI/FCI70-2: 0.05% of CV
Compliance ·
2.2 Materials
Valve size DN 15 to 80 NPS½ to 3
Valve body
Spheroidal
graphite iron
EN-JS1049
Cast steel
1.0619
Stainless
steel
1.4408
Spheroidal
graphite
iron A395
Cast steel
A216 WCC
Stainless
steel A351
CF8M
Valve bonnet Cast steel S235JR (St 37) 1.4408 Cast steel S235JR (St 37) 1.4408
Seat ≤DN25: 1.4305 · ≥DN32: 1.4104 ≤NPS1: 1.4305 · ≥NPS1½: 1.4104
Plug 1.4305
Bellows seal 1.4541 · 1.4301
Packing PTFE
Body gasket Graphite on metal core
2.3 KVS and CV coefcients, seat diameters and travel
Valve size DN 15 20 25 32 40 50 65 80
NPS ½¾ 1 – 1½ 22½ 3
KVS coefcients 4 6.3 8 16 20 32 50 80
CV coefcients 5 7.5 9.4 –23 37 60 94
Seat Ø mm/in 24/0.94 40/1.57 65/2.56
Travel mm/in 15/0.59 15/0.59 15/0.59

EB 8135/8136 EN 9
Installation
3 Installation
Valve and actuator are delivered ready
mounted.
Refer to the corresponding mounting and
operating instructions for more details on the
actuator used.
3.1 Mounting position
The valve can be mounted in any desired
position.
ÎObserve the restrictions for the actuator
used.
NOTICE
Install the valve free of stress and
with the least amount of vibrations as
possible. If necessary, support the
pipelines near the connections. Do
not attach supports directly to the
valve or actuator.
Pipeline routing
To ensure that the control valve func-
tions properly, the pipeline must be
straight and without any manifolds
or disturbances for a distance of at
least 6times the valve size (DN) up-
stream and downstream of the valve.
Contact SAMSON if this distance
cannot be observed.
Flush the pipeline thoroughly before
installation of the valve.
3.2 Arrangement of the valve
Install the valve as shown in Fig.2 depend-
ing on whether it is to be used for mixing or
diverting service.
The plug arrangement (i.e. either mixing or
diverting valve) is indicated on a label at-
tached to the valve body.
Fail-safe action: the valve shuts off the ow
of the heating medium or opens the ow of
the cooling medium.
3.3 Strainer and bypass
We recommend installing a SAMSON
Type2N Strainer upstream of the valve, and
upstream of both inlet ports in mixing valves.
We recommend installing a shut-off valve
both upstream of the strainer and down-
stream of the valve to ensure that the plant
does not need to be shut down for mainte-
nance. In addition, install a bypass line.

10 EB 8135/8136 EN
Installation
Mixing service
Temperature control Q = constant
Diverting service
Temperature control Q=0 to 100%
Fail-safe action: FA = Actuator stem extends, FE = Actuator stem retracts
Heating with mixing valve (FA) or cooling with mixing valve (FE)
Installation in ow pipe Installation in return ow pipe
AAB
B
A
AB
B
Flow pipe
Return ow
pipe
Flow pipe
Return ow
pipe
A
AB
B
AAB
B
Flow pipe
Return ow
pipe
Flow pipe
Return ow
pipe
Heating with diverting valve (FA) or cooling with diverting valve (FE)
Installation in return ow pipe Installation in ow pipe
AAB
B
AAB
B
Flow pipe
Return ow
pipe
Flow pipe
Return ow
pipe
A
AB
B
AB A
B
Flow pipe
Return ow
pipe
Flow pipe
Return ow
pipe
Fig.2: Typical installations

EB 8135/8136 EN 11
Operation
4 Operation
The operating instructions only apply in con-
junction with the actuator. Refer to the corre-
sponding mounting and operating instruc-
tions.
5 Maintenance
The control valve is subject to normal wear,
especially at the seat, plug, bellows, and
packing.
Depending on the operating conditions,
check the valve at regular intervals to pre-
vent possible failure before it can occur.
External leakage can indicate that the bel-
lows seal or packing is defective.
If the valve does not close tightly, tight shut-
off may be impaired by dirt stuck between
the seat and plug or by damaged facings.
Valves in DN15 to 25 have a one-pieced
plug, which is used for mixing and diverting
valves using the same arrangement.
In valves ≥DN32, two V-port plugs are
used. In mixing valves, the plugs are guided
in the seats from the inside. Whereas, in di-
verting valves, they are guided into the seats
from the outside.
To keep the exact position of the plug, spacer
sleeves are used to keep the plug on the plug
stem. The different arrangement for valves in
DN32 to 50 and for valves in DN65 and
80 as mixing and diverting valves is de-
scribed in the section on assembly.
We recommend removing the parts, cleaning
them, and, if necessary, replacing them with
new ones.
WARNING!
−Before performing any work on the
control valve, make sure the rele-
vant plant section has been depres-
surized and, depending on the
process medium, drained as well.
−When used at high temperatures,
allow the plant section to cool
down to ambient temperature.
−Make sure the electrical or pneu-
matic control signal for the actuator
is switched off. Remove the signal
pressure line of a pneumatic actua-
tor.
−Valves are not free of cavities. As a
result, residual process medium
might still be contained in the
valve.
−We recommend removing the valve
from the pipeline.
NOTICE
Before performing any repair work,
remove the actuator from the valve.
Unscrew the screws on the stem con-
nector (7) and the nut (9). Lift the ac-
tuator off the valve (see Fig.1).
Note:
The required tightening torques are
specied in the following instructions.
Suitable seat wrenches are addition-
ally listed in section5.3.


12 EB 8135/8136 EN
Maintenance
5.1 Replacing the bellows seal
If the packing leaks, this is due to a defective
bellows seal. In this case, the entire bellows
seal assembly must be replaced together
with the packing (4.2).
We recommend renewing the top gasket
(5.3) and bottom gasket (1.2) at the bellows
housing as well.
Mixing and diverting valves in DN32 to 80
differ in the arrangement of their plugs and
sleeves (see Fig.1). Valves in DN15 to 25
have the same plug and sleeve arrangement.
5.1.1 Disassembly
1. In valves ≤DN50, unscrew the lock nut
(6.2) and stem connector nut (6.1) from
the plug stem.
2. Unscrew the coupling nut (5.1) from the
bellows housing.
3. Remove nuts (1.1) and lift off the ange
(5.4).
4. Pull out the bellows housing (5.2) and
bellows seal as far as they will go. Place
an open-end wrench SW10 (≤DN50)
or SW13 (≥DN65) at the side on the
hexagon (X) or at the attened area of
the plug stem to hold the stem stationary.
Loosen the nut (12) and remove the
wrench.
5. Unscrew the nut (12). Remove the two re-
taining washers (12.2) and washer
(12.1).
6. DN15 to 25
Carefully pull the plug stem (6) together
with the bellows seal (5) and bellows
housing (5.2) out of the body from
above.
DN32 to 80
Keep hold of the bottom plug of diverting
valves or the bottom sleeve of mixing
valves on the plug stem. Use a long
screw (M8 for DN32 to 50 and M12 for
DN65 and 80) to keep the plugs (3.x)
and sleeves (10.x) in the right position.
Carefully pull the plug stem together with
the bellows seal (5) and bellows housing
(5.2) out of the body from above.
Guide the screw (to hold the plugs and
sleeves) into the valve body and push up-
wards, allowing the plugs and sleeves to
slide onto the screw.
7. Carefully clean all the parts and check
them for damage. Replace the plug stem
together with the bellows seal and pack-
ing with new parts.

EB 8135/8136 EN 13
Maintenance
AB
A
B
12.2
12
12.1
1.1
6.1
6.2
5.3
5
5.2
X
5.4
1.2
4.2
4.3
5.1
3.2
Fig.3: Mixing valve DN32 to 50
2.2
2.1
12.1
12.2
12
3
Fig.4: Mixing valve DN15 to 25
2.2
3.2
3.1
2.1
10.2
10.3
10.1
Fig.5: Mixing valve DN32 to 50
5.1.2 Assembly
Note:
Contact your nearest SAMSON sub-
sidiary or the SAMSON After-sales
Service department for information
on suitable lubricants.
1. Apply a suitable lubricant to the gasket
(5.3) and thread on the bellows housing.
2. Insert the gasket (5.3) on the bellows
housing (5.2).
3. Push the bellows seal (5) together with
the plug stem into the bellows housing.
Tighten the coupling nut (5.1) by hand
only at rst.
4. Insert the gasket (1.2) into the valve
body.
5. DN15 to 25
Place the ready-assembled bellows seal
assembly on the valve body, while guid-
ing the plug stem through the holes in the
plug.


14 EB 8135/8136 EN
Maintenance
DN32 to 80
Gradually insert the plug stem of the
ready-assembly bellows seal assembly
(5) into the valve body, allowing the
plugs and sleeves to slide from the screw
(used to hold the plugs and sleeves) onto
the plug stem.
6. First place the washer (12.1) and then
the pair of serrated retaining washers
(12.2) onto the plug stem, making sure
the coarsely serrated surfaces of the re-
taining washers face each other and the
radial ribs face outwards. Thread the nut
(12) onto the plug stem by hand.
Note:
For valves in DN15 to 50, a special
tool designed to hold the washers
(12.1 and 12.2) can be ordered (see
section5.3). Especially on valves in
DN15 to 25, it is difcult to mount
the washers onto the plug stem due
to insufcient space.
7. Slightly pull out the bellows housing (5.2)
together with the bellows seal. Place an
open-end wrench at the side on the
hexagon or at the attened area (X) of
the plug stem to hold the stem stationary.
NOTICE
Do not twist the bellows.
8. Tighten the nut (12) to secure the plugs
and the sleeves:
Valve size 15 to 50 65 to 80
Nut (12) 15Nm 25Nm
9. Remove the open-end wrench.
10. Place on the ange (5.4) and align it
with the bellows housing (5.2), while
making sure the gasket (1.2) is correctly
positioned.
11.Fasten the nuts (1.1):
Valve size 15 to 25 32 to 50 65 to 80
Nuts (1.1) M10
10Nm
M12
30Nm
M16
90Nm
Tighten the coupling nut (5.1) with
80Nm tightening torque.
12.For DN15 to 50, thread the lock nut
(6.2) and stem connector nut (6.1) onto
the top end of the plug stem again. Ad-
just the stem connector nut (6.1) to keep
the dimension of 50mm from the top of
the bellows seal assembly (5) to the top
of the stem connector nut (6.1) after the
plug stem has been pushed completely
into the valve (see Fig.15).
13. Mount the actuator onto the valve ac-
cording to the associated mounting and
operating instructions.


EB 8135/8136 EN 15
Maintenance
5.2 Replacing the seat and
plug
When replacing the seat and/or plug, we
recommend renewing the gaskets (5.3, 1.2)
at the top and bottom of the bellows housing
as well.
5.2.1 Mixing valve
Disassembly
AB
A
B
12.2
12
12.1
1.1
6.1
6.2
5.3
5
5.2
X
5.4
1.2
4.2
4.3
5.1
3.2
Fig.6: Mixing valve DN32 to 50
2.2
2.1
12.1
12.2
12
3
Fig.7: Mixing valve DN15 to 25
12.1
12.2
12
11.1
11.2
11.3
11.4
3.1
3.2
Fig.8: Mixing valve DN65 and 80
1. In valves ≤DN50, unscrew the lock nut
(6.2) and stem connector nut (6.1) from
the plug stem.
2. Unscrew the coupling nut (5.1) from the
bellows housing. Remove nuts (1.1) and
lift off the ange (5.4).
3. Pull out the bellows housing (5.2) and
bellows seal as far as they will go. Place
an open-end wrench SW10 (≤DN50)
or SW13 (≥DN65) at the side on the
hexagon (X) or at the attened area of
the plug stem to hold the stem stationary.
Loosen the nut (12) and remove the
wrench.

16 EB 8135/8136 EN
Maintenance
4. Unscrew the nut (12). Remove the two re-
taining washers (12.2) and washer
(12.1).
In mixing valves DN32 to 80, pull bot-
tom sleeve (10.3 or 11.4) off the plug
stem.
5. Lift the bellows housing (5.2) together
with the bellows seal (5) and carefully
pull the plug stem (6) out of the valve
body.
Pull the bellows seal (5) out of the bel-
lows housing and remove the body gas-
ket (1.2).
6. Carefully clean all the parts and check
them for damage. Renew defective parts.
7. In valves ≥DN32, remove sleeve (10.1
or 11.1).
Unscrew the top seat (2.1) using a suit-
able seat wrench (see section5.3).
8. DN15 to 25
Remove the plug (3) from the valve body.
DN32 to 50
Remove the top plug (3.1), sleeve (10.2),
and bottom plug (3.2) from the valve
body.
DN65/80
Remove the top plug (3.1), sleeves (11.2
and 11.3), and bottom plug (3.2) from
the valve body.
9. Unscrew the bottom seat (2.2) from the
valve body.
10. Carefully clean all the parts and check
them. If necessary, renew or machine
them.
Assembly
AB
A
B
12.2
12
12.1
1.1
6.1
6.2
5.3
5
5.2
X
5.4
1.2
4.2
4.3
5.1
3.2
Fig.9: Mixing valve DN32 to 50
2.2
2.1
12.1
12.2
12
3
Fig.10: Mixing valve DN15 to 25

EB 8135/8136 EN 17
Maintenance
12.1
12.2
12
11.1
11.2
11.3
11.4
3.1
3.2
Fig.11: Mixing valve DN65 and 80
1. Apply a suitable lubricant to the gasket
(5.3) and thread on the bellows housing.
2. Insert the gasket (5.3) on the bellows
housing (5.2).
3. Push the bellows seal (5) together with
the plug stem into the bellows housing.
Tighten the coupling nut (5.1) by hand
only at rst.
4. Apply a suitable lubricant to the thread
and the sealing cone of the new or ma-
chined seats.
5. Use the seat wrench to screw in the bot-
tom seat (2.2), observing the correct
tightening torques:
Valve size 15 to 25 32 to 50 65 to 80
Seat thread M32x1.5 M58x1.5 M90x1.5
Tightening
torque 120Nm 500Nm 1050Nm
6. DN15 to 25
Insert the plug (3) into the bottom seat
(2.2).
DN32 to 50
Insert the bottom plug (3.2) into the bot-
tom seat (2.2).
Place the short sleeve (10.2) and top
plug (3.1) one after the other onto the
bottom plug. To x them into position, in-
sert a long M8 screw through the bottom
plug.
DN65/80
Insert the bottom plug (3.2) into the bot-
tom seat (2.2).
Place the two short sleeves (11.3 and
11.2) and top plug (3.1) one after the
other onto the bottom plug. To x them
into position, insert a long M12 screw
through the bottom plug.
7. Screw the top seat (2.1) into the body,
ensuring that the top plug can easily
slide into the seat. Refer to table in step 5
for the correct tightening torque.
8. Insert the gasket (1.2) into the top valve
ange.
9. DN15 to 25
Carefully place the bonnet onto the
valve, while guiding the plug stem into
the plug (3).
DN32 to 50
Slide the sleeve (10.1) over the plug
stem. Carefully place on the bonnet,
while guiding the plug stem through the
top plug (3.1), sleeve (10.2), and bottom
plug (3.2) and, at the same time, remove
the M8 screw.

18 EB 8135/8136 EN
Maintenance
Slide the sleeve (10.3) onto the plug stem
from underneath.
DN65 and 80
Slide the sleeve (11.1) over the plug
stem. Carefully place on the bonnet,
while guiding the plug stem through the
top plug (3.1), two sleeves (11.2 and
10.3), and bottom plug (3.2) into the
body and, at the same time, remove the
M12 screw.
Slide the sleeve (11.4) onto the plug stem
from underneath.
10. First place the washer (12.1) and then
the pair of serrated retaining washers
(12.2) onto the plug stem, making sure
the coarsely serrated surfaces of the re-
taining washers face each other and the
radial ribs face outwards. Thread the nut
(12) onto the plug stem by hand.
Note:
For valves in DN15 to 50, a special
tool designed to hold the washers
(12.1 and 12.2) can be ordered (see
section5.3). Especially on valves in
DN15 to 25, it is difcult to mount
the washers onto the plug stem due
to insufcient space.
11.Slightly pull out the bellows housing (5.2)
together with the bellows seal. Place an
open-end wrench at the side on the
hexagon or at the attened area (X) of
the plug stem to hold the stem stationary.
NOTICE
Do not twist the bellows.
12.Tighten the nut (12) to secure the plugs
and the sleeves:
Valve size 15 to 50 65 to 80
Nut (12) 15Nm 25Nm
13. Remove the open-end wrench.
14. Place on the ange (5.4) and align it
with the bellows housing (5.2), while
making sure the gasket (1.2) is correctly
positioned.
15. Fasten the nuts (1.1):
Valve size 15 to 25 32 to 50 65 to 80
Nuts (1.1) M10
10Nm
M12
30Nm
M16
90Nm
Tighten the coupling nut (5.1) with
80Nm tightening torque.
16.For DN15 to 50, thread the lock nut
(6.2) and stem connector nut (6.1) onto
the top end of the plug stem again. Ad-
just the stem connector nut (6.1) to keep
the dimension of 50mm from the top of
the bellows seal assembly (5) to the top
of the stem connector nut (6.1) after the
plug stem has been pushed completely
into the valve (see Fig.15).
17. Mount the actuator onto the valve ac-
cording to the associated mounting and
operating instructions.


EB 8135/8136 EN 19
Maintenance
5.2.2 Diverting valve
Disassembly
1. In valves ≤DN50, unscrew the lock nut
(6.2) and stem connector nut (6.1) from
the plug stem.
2. Unscrew the coupling nut (5.1) from the
bellows housing. Remove nuts (1.1) and
lift off the ange (5.4).
3. Pull out the bellows housing (5.2) and
bellows seal as far as they will go. Place
an open-end wrench SW10 (≤DN50)
or SW13 (≥DN65) at the side on the
hexagon (X) or at the attened area of
the plug stem to hold the stem stationary.
Loosen the nut (12) and remove the
wrench.
4. Unscrew the nut (12). Remove the two re-
taining washers (12.2) and washer
(12.1).
5. Pull the bellows seal (5) out of the bel-
lows housing and remove the body gas-
ket (1.2).
6. Carefully clean all the parts and check
them for damage. Renew defective parts.
7. DN15 to 25
Unscrew the top seat (2.1). Remove the
plug (3) from the valve body. Take out
the bottom seat (2.2).
DN32 to 50
Remove the top plug (3.1) and the three
sleeves (10.1, 10.2, 10.3) from the valve
body.
DN65/80
Remove the top plug (3.1) and the four
sleeves (11.1, 11.2, 11.3, 11.4) from
the valve body.
8. DN32 to 80
Unscrew the top and bottom seat (2.1,
2.2) using a suitable seat wrench (see
section5.3) from the valve body.
Remove the bottom plug (3.2) from the
valve body.
9. Carefully clean all the parts and check
them. If necessary, renew or machine
them.
AB A
B
12.2
12
12.1
1.1
6.1
6.2
5.3
5
5.2
X
5.4
1.2
4.2
4.3
5.1
3.2
Fig.12: Valve bonnet with bellows seal

20 EB 8135/8136 EN
Maintenance
Assembly
1. Apply a suitable lubricant to the gasket
(5.3) and thread on the bellows housing.
2. Place on the gasket (5.3) and push the
bellows seal (5) together with the plug
stem into the bellows housing (5.2).
Tighten the coupling nut (5.1) by hand at
rst.
3. Apply a suitable lubricant to the thread
and the sealing cone of the new or ma-
chined seat.
4. DN15 to 25
Screw in the bottom seat (2.2) and tight-
en:
Valve size 15 to 25
Seat thread M32x1.5
Tightening torque 120Nm
Place the plug (3) in the bottom seat.
Screw in the top seat (2.1), ensuring that
the plug can slide into the seat from un-
derneath. Tighten the top seat with the
same tightening torque.
DN32 to 50
Insert the bottom seat (3.2) into the valve
body. Use the seat wrench to screw in
the bottom seat (2.2) and top seat (2.1)
one after the other.
Valve size 32 to 50
Seat thread M58x1.5
Tightening torque 500Nm
Place the top plug (3.1) and three sleeves
(10.1, 10.2, 10.3) onto the plug stem
one after the other.
DN65 and 80
Insert the bottom seat (3.2) into the valve
body. Use the seat wrench to screw in
the bottom seat (2.2) and top seat (2.1)
one after the other:
2.2
2.1
10.1
10.2
10.3
3.2
3.1
12.1
12.2
12
11.1
11.2
11.3
11.4
2.1
3.1
3.2
2.2
Fig.13: Diverting valve DN32 to 50 Fig.14: Diverting valve DN65 and 80