GESTRA Gestramat CW 41 User manual

Gestramat Cooling-Water Control
Valve
CW 41
CW 41/4
MCW 41
MCW 41/4
Original Installation Instructions
819468-01

Contents
Foreword ............................................................................................................................................3
Availability.............................................................................................................................................3
Formatting features in the document ......................................................................................................3
Directions in this manual........................................................................................................................3
Safety..................................................................................................................................................3
Use for the intended purpose .................................................................................................................3
Basic safety notes .................................................................................................................................4
Information on property damage or malfunctions .....................................................................................4
Qualification of personnel.......................................................................................................................5
Protective gear......................................................................................................................................5
Typographic features of warning notes....................................................................................................5
Formatting features for warnings of property damage ..............................................................................5
Description .........................................................................................................................................6
Scope of supply and equipment specification ..........................................................................................6
Task and function................................................................................................................................10
Storing and transporting the equipment.........................................................................................11
Storing the equipment .........................................................................................................................11
Transporting the equipment .................................................................................................................11
Mounting and connecting the equipment.......................................................................................12
Preparing installation ...........................................................................................................................12
Attaching parts to the equipment..........................................................................................................13
Connecting the equipment ...................................................................................................................14
Operation ..........................................................................................................................................15
Adjusting the cooling-water outlet temperature......................................................................................15
Setting the bleed flow ..........................................................................................................................17
After operation .................................................................................................................................17
Removing external dirt deposits............................................................................................................18
Maintaining the equipment...................................................................................................................18
Servicing the equipment and installing spare parts ................................................................................19
Troubleshooting ...............................................................................................................................29
Putting the equipment out of operation..........................................................................................30
Removing harmful substances..............................................................................................................30
Removing the equipment .....................................................................................................................30
Re-using equipment after storage.........................................................................................................31
Disposing of the equipment..................................................................................................................32
Technical data..................................................................................................................................33
Dimensions and weights ......................................................................................................................33
Pressure & temperature ratings............................................................................................................36
Manufacturer's declaration.............................................................................................................37

3
Foreword
This installation & operating manual will help you
use the following types of equipment safely and
efficiently for their intended purpose.
CW 41
CW 41/4
MCW 41
MCW 41/4
These steam traps will be called equipment in this
document.
This installation & operating manual is intended for
anyone commissioning, using, operating, servicing,
cleaning or disposing of this equipment and, in
particular, for professional after-sales service
technicians, qualified personnel and authorised and
trained staff.
All of these persons must read and understand the
content of this installation & operating manual.
Following the instructions given in this installation &
operating manual helps avoiding danger and
increases the reliability and service life of the
equipment. Please note that in addition to the
instructions given in this installation & operating
manual you must also observe all locally applicable
rules and regulations concerning the prevention of
accidents as well as approved safety guidelines for
good professional practice.
Availability
Keep this installation & operating manual together
with the plant documentation for future reference.
Make sure that this installation & operating manual
is available to the operator.
The installation & operating manual is part of the
equipment. Please hand over this installation &
operating manual when selling the equipment or
passing it on.
Formatting features in the
document
Certain text elements of this installation & operating
manual feature a specific typographic design. You
can easily distinguish the following text elements:
Standard text
Cross-reference
Listing
Sub-items in listings
Steps for action.
Here you will find additional useful
information and tips serving to assist you
in using the equipment to its fullest
potential.
Directions in this manual
The following directions are used in this manual:
The "front" of the equipment is the side of the
body that bears the name plate.
The "underside" of the equipment is where the
adjuster is fitted.
The medium inlet is on the "left" of the body,
the medium outlet on the "right".
Safety
Use for the intended purpose
The following types of cooling-water control valve
are employed in the cooling-circuit return, in order
to maintain a constant return temperature:
CW 41
CW 41/4
MCW 41
MCW 41/4
The equipment must only be used within the
allowable pressure and temperature limits and only
if the chemical and corrosive influences on the
equipment are taken into account.

4
Correct use includes compliance with the
instructions given in this installation & operating
manual, in particular obedience to all safety
instructions.
Any other use of the equipment is considered to be
improper.
Note that the equipment is also used incorrectly if
the materials of the equipment are not suitable for
the fluid.
Basic safety notes
Risk of severe injuries
The equipment is under pressure during
operation and may be hot. Before carrying out
any work on the equipment make sure that the
following requirements are met:
The pipes must be depressurized (0 bar).
The fluid must be completely removed from
the pipes and the equipment.
During work on the equipment the
installation must be switched off and
protected against unauthorised or
unintended activation.
The pipes and the equipment must have
cooled down to room temperature (approx.
20 °C).
If the equipment is used in contaminated areas
there is a risk of severe injuries or death caused
by harmful substances in or on the equipment.
Before working on the equipment make sure
that it is completely decontaminated. Always
wear the protective clothing prescribed for
contaminated areas when working on the
equipment.
The equipment must only be used with fluids
that do not attack the material and the gaskets
and sealings of the equipment. Otherwise leaks
may occur and hot or toxic fluid could escape.
The equipment and its component parts must
only be mounted or removed by qualified
personnel. A qualified person must be
acquainted with and experienced in the
following:
Making pipe connections.
Selecting suitable lifting gear and
understanding the rules for its safe use.
Working with dangerous (contaminated, hot
or pressurized) fluids.
If the admissible temperature and pressure
limits are exceeded the equipment may be
destroyed and hot or pressurized fluid may
escape. Make sure that the equipment is only
operated within the admissible service range
and limits.
For more information on limits and pressure &
temperature ratings see name plate and the
section "
Technical Data ".
Risk of minor injuries
Sharp edges on internals present the danger of
cuts to hands. Always wear industrial gloves
when servicing the equipment.
If the support of the equipment during
installation is insufficient the equipment might
fall down, thereby causing bruises or injuries.
Make sure the equipment is safely held in place
during installation and cannot fall down. Wear
protective safety footwear.
Information on property damage
or malfunctions
Malfunctions will occur if the equipment is
installed in a wrong position or with the flow
arrow pointing in the opposite direction of the
fluid flow. This may result in damage to the
equipment or the installation. Make sure that
the flow arrow on the equipment body matches
the indicated direction of the fluid flow in the
pipe.
If the material is unsuitable for the fluid,
increased wear may occur and fluid may
escape. Make sure that the material is suitable
for the fluid used in your installation.

5
Qualification of personnel
A qualified person must be acquainted with and
experienced in the following:
the pertinent on-site rules and regulations for
preventing fire and explosions as well as
industrial safety regulations
working on pressure equipment
making pipe connections
working with dangerous (hot or pressurized)
fluids
lifting and transporting loads
observing all notes and instructions in this
installation & operating manual and the
applicable documents
Protective gear
The operator must ensure that anyone working on
the equipment must wear the required protective
clothing and safety gear stipulated for the site of
installation. The protective clothing must be suitable
for the used media and must protect the wearer
against safety and health hazards associated with a
particular job to be carried out at the site of
installation. Protective clothing & equipment must
provide protection from potential hazards, in
particular from injuries to:
Head
Eyes
Body
Hand
Feet
Hearing
Note that this list is not exhaustive. The operator
must establish personal protective equipment
guidelines and specify any additional protective
gear that is required if the worker is exposed to a
specific risk at the site of installation.
Typographic features of warning
notes
DANGER
Notes with the heading DANGER warn
against imminent dangerous situations
that
can lead to death or serious injuries.
WARNING
Notes with the heading WARNING warn
against
possibly dangerous situations that
could lead to death or serious injuries.
CAUTION
Notes with
the heading CAUTION warn
against dangerous situations that could
lead to minor or moderate injuries.
Formatting features for warnings
of property damage
Attention!
This information warns of a situation
leading to property damage.

6
Description
Scope of supply and equipment
specification
Scope of supply
The following equipment parts are not installed on
delivery, and must be fitted before assembly:
Thermometer with sealing ring
Pressure gauge
Adjusting key
The diagrams below show a type CW
41
DN25 device.
Equipment specification
No.
Designation
1
Lid
2
Body gasket
3
Spring
4
Body
5
Name plate
No.
Designation
6
Adjuster with adjusting key
7
Setting screw for bleed flow
8
Thermometer
9
Pressure gauge
10
Direction of flow arrow

7
No.
Designation
3
Spring
11
Thermostat (diagram shows model DN25
with one thermostat)
No.
Designation
12
Double cone
13
Pin of adjuster
14
Pin for setting the bleed flow
Optional extras
The following items are available as optional extra:
The double cone is available in two versions:
s-cone for high flow rates
r-cone for reduced flow rates, with holes and
additional groove with O-ring
The control unit consists of one (DN25), two (DN40,
DN50) or three (DN80, DN100) solids thermostats,
depending on the size of the equipment.

8
There are three types of solids thermostat for
different outlet temperatures:
n-thermostat with rubber elastic expansion
material for an outlet temperature from +3 to
+100 °C
k-thermostat with rubber elastic expansion
material for an outlet temperature from –32 to
+74 °C
w-thermostat with expansion wax for an outlet
temperature from +20 to +60 °C
The combination of double cone and
thermostat types used in the equipment is
stated on the name plate.
In this manual, thermostats are always
mentioned in the singular, regardless of
the number of th
ermostats actually
installed in the equipment. All the
information in this manual applies to all
installed thermostats.
In addition to the standard version, the equipment
can also be supplied in the following versions:
MCW 41 and MCW 41/4 with diaphragm
actuator (see section below)
CW 41/4 with inner parts suitable for saline
media, cooling water containing ammonia, and
chlorinated hydrocarbons
Type CW 41/4 units differ only in the type of
materials used for the standard equipment. For
CW 41/4 models, adapters for the adjuster,
thermometer and pressure gauge are available as
optional extras. These adapters increase the
distance from the body, making it possible to read
and operate the equipment after the fitting of
insulation on-site. A thermometer with an extended
length of 105 mm is also available as an optional
extra.
MCW 41 and MCW 41/4 with diaphragm
actuator
The diaphragm actuator (15) is mounted on the lid
(1). Via the compressed air connection on the side,
a compressed air line supplies the diaphragm
actuator (16) with compressed air provided by the
customer. The compressed air connection has an
ERMETO GE 6-L coupling.
You can also retrofit a diaphragm actuator on all
equipment. To do this, remove the lid and replace
by a lid with diaphragm actuator.
End connections
The equipment is available with the following end
connections:
Flanges

9
Name plate
The following items are indicated on the name
plate:
Manufacturer
Type designation
Design
Pressure rating
Max. admissible differential pressure
The following items are indicated on the equipment
body:
Date of manufacturing
Nominal size
Material
Direction of flow
Batch code
The name plate also contains a code for the control
unit used for the equipment. This code indicates the
combination of double cone and thermostat types.
Application of European Directives
Pressure Equipment Directive
The equipment conforms to this directive (see
"Manufacturer's Declaration" section) and can be
used for the following media:
CW 41
Fluids of group 2
(for fluid media only)
CW 41/4
Fluids of group 1
Fluids of group 2
(for fluid media only)
ATEX Directive
CW 41 and CW 41/4
The equipment does not have its own potential
ignition source and is not subject to this directive
(see "Manufacturer's Declaration" section).
When installed, static electricity may arise between
the equipment and the connected system.
When used in potentially explosive atmospheres,
the plant manufacturer or plant operator is
responsible for discharging or preventing possible
static charge.
If it is possible for medium to escape, e.g. through
actuating mechanisms or leaks in threaded joints,
the plant manufacturer or plant operator must take
this into consideration when dividing the area into
zones.
MCW 41 and MCW 41/4
The equipment has classification: CE Ex II 2G/D c X.
For use in potentially explosive atmospheres in
zones (surrounding atmosphere to Directive
1999/92/EC) 1, 2, 21 and 22, please read and
observe the following information:
The sign "X" in the Ex label signifies that operation
at an excessive surface temperature caused by the
medium must be avoided. The equipment itself
does not generate additional surface temperatures.
Once installed, static electricity may arise between
the equipment and the connected system. During
use in potentially explosive atmospheres, the
discharge or prevention of possible electrostatic
charging is the responsibility of the manufacturer or
owner of the system. If there is a possibility that
medium might escape, e.g. via actuating devices
or leaks in screwed couplings, the manufacturer or
owner of the system must take this into
consideration when dividing the area into zones.
If the MCW has a pneumatic drive, if incorrectly
discharged the exhaust air (compressed air)
required for operation can lead to swirls of
potentially explosive dust.

10
Task and function
Purpose
Cooling-water control valves are directly actuated
proportional controllers. They are used to maintain
a constant return temperature in a cooling-water or
cooling-solution return. The return temperature can
be adjusted.
This enables a higher return temperature and
therefore increased heat absorption by the cooling
water or cooling solution. The consumption of
coolant and energy is therefore reduced.
Cooling-water control valves also ensure the
demand-based supply of coolant to heat
exchangers connected in parallel.
The optional diaphragm actuator provides the
additional function of removing impurities. This
enables the equipment to be used with dirty or
untreated cooling water. The diaphragm actuator
can also be operated centrally. This way, you can
switch the diaphragm actuator on and off from a
control stand, for example .
Function
CW 41 and CW 41/4
The control unit consists of one (DN25), two (DN40,
DN50) or three (DN80, DN100) solids thermostats,
depending on the size of the equipment.
When the equipment becomes hot, the expansion
material in the thermostat (11) expands in volume.
When the return temperature increases, a pin is
pushed out of the thermostat. This lifts and
therefore opens the double cone (12) against the
pressure of the spring (3). The flow rate increases.
When the return temperature falls, the expansion
material in the thermostat shrinks in volume. The
spring pressure closes the double cone. The flow
rate falls.
A bleed flow is continually present, even when the
equipment is closed. The bleed flow enables the
equipment to react quickly to changes in return
temperature. You can regulate the bleed flow rate
using a setting screw (7).
In models with r-cone, the bleed flow is directed
through two holes in the double cone. In models
with s-cone, the bleed flow is directed via the lower
seat.
To set the desired return temperature, use the
adjuster (6). The currently set return temperature is
displayed on a scale on the adjusting key.

11
MCW 41 and MCW 41/4
The diaphragm actuator (15) is driven by
compressed air. When operated, the diaphragm
actuator lifts a spindle (17). The spindle completely
opens the double cone. Impurities are therefore
flushed out of the equipment. After the flushing
process, the double cone is closed by spring
pressure as soon as the diaphragm actuator is
switched off.
Storing and transporting the
equipment
Attention!
Equipment can be damaged if stored or
transported improperly.

Close all openings with the sealing
plugs or covers supplied with the
equipment or use similar sealing
covers.

Protect the equipment against
moisture and corrosive atmospheres.

Please contact the manufacturer if the
specified transport and/or storage
requirements cannot be met.
Storing the equipment
Please observe the following items when storing
the equipment:
Do not store the equipment for more than 12
months.
Use the supplied sealing plugs or other suitable
seal caps in order to seal off all openings of the
equipment.
Protect the sealing surfaces and contact areas
against mechanical damage.
Protect the equipment and all components
against hard shocks and impacts.
Store the equipment only in closed rooms that
meet the following environmental conditions:
Air humidity below 50 %, not condensing
Indoor air: clean, salt-free and non-corrosive
Temperature 5–40 °C.
Make sure that all these requirements are
always met when storing the equipment.
Please contact the manufacturer if you cannot
comply with the recommended storage
conditions.
Transporting the equipment
CAUTION
Do not drop the equipment. If it falls down
it may cause bruises and injuries.

To transport and mount the equipment
safely use suitable lifting gear.

Connect the noose strap of the lifting
gear to the body.

Provide sufficient support for the
equipment during transport and
installation.

Wear protective safety footwear.
Lightweight equipment may be transported and
mounted without using any lifting gear.

12
To lift equipment the weight of which exceeds
approx. 25 kg, you need the help of a second
person or suitable lifting gear.
Your physical strength and on-site regulations and
conditions determine what weight can be lifted and
if support is required.
Meet the requirements for storage also when
transporting the equipment.
Prior to transport seal off connections with
sealing plugs.
If you do
not have the sealing plugs
supplied with the equipment use
appropriate seal caps to seal off the
connections.
For short distances (only a few metres) you can
transport the equipment unpacked.
When transporting the equipment over larger
distances use the original packaging.
If you do not have the original packaging use a
box that protects the equipment adequately
against corrosion and physical damage.
For a short period of time the equipment
may be transported even if the
temperature is below 0
°C, provided that
the equipment is completely empty and
dry.
Mounting and connecting the
equipment
Preparing installation
Take the equipment out of the transport
packaging.
Check the equipment for transport damage.
Contact the manufacturer if you detect any kind
of shipping damage.
When supplied by the factory, the connections may
be sealed off with sealing plugs.
Remove sealing plugs before mounting the
equipment.
Keep the sealing plugs and the packing for
further use.
DANGER
Personnel working on pipes are exposed to
safety risks and may suffer severe injuries,
poisoning or even loss of life.

Make sure that no hot or hazardous
fluid is in the equipment or the pipes.

Make sure that the pipes upstream
and downstream of the equipment are
depressurised.

Make sure that the installation is
switched off and protected against
unauthorised or unintended activation.

Make sure that the equipment and the
pipes have cooled down to room
temperatures.

Wear protective clothing that is
suitable for the fluid and, if necessary,
wear protective gear.
For more information on suitable protective clothing
and safety gear refer to the safety data sheet of the
fluid in question.
Drain pipes until they are empty.
Switch the installation off and protect it against
unauthorised or unintended re-activation.

13
The following tools are required for working on the
equipment:
Torque wrench 10–100 Nm to DIN ISO 6789
Open-ended spanner size 8 (hex nuts on
diaphragm actuator)
Open-ended spanner size 13 (hex nuts on
models with DN25 to DN50 and hex nut on
setting screw)
Open-ended spanner size 14 (pressure gauge)
Open-ended spanner size 16 (hex nuts in
models from DN80 onwards)
Open-ended spanner size 17 (hex nuts on older
models from DN80 onwards)
Open-ended spanner size 19 (thermometer and
setting screw)
Open-ended spanner size 32 (adjuster)
To operate a diaphragm actuator on an MCW 41, a
compressed air connection with a pressure from 3
to 10 barg is required.
Ensure an adequate supply of compressed air at
the installation site.
Attaching parts to the equipment
Important!
Incorrect assembly can damage measuring
equipment.

Make sure that assembly is performed
by specialist personnel.

Only apply the tool to the hex nut of
the fastening.

Do not apply the tool directly to the
measuring equipment.
Attach parts supplied loose on delivery before
assembling the equipment.
To attach the thermometer (8), proceed as follows:
Remove the screw plug and sealing ring from
the right-hand connection (20).
Insert the sealing ring (18) in the right-hand
connection on the body.
Lubricate all threads and the contact surfaces of
nuts and bolts with temperature-resistant
lubricant.
The lubricant must have the same properties as
OKS®217.
Screw the thermometer onto the hex nut of the
right-hand connection on the body using a
size 19 open-ended spanner.
Tighten the thermometer fastening to a torque
of 64 Nm.
To attach the pressure gauge (9), proceed as
follows:
Remove the screw plug and sealing ring from
the left-hand connection (20).
Wind PTFE sealing tape (19) tightly around the
thread of the pressure gauge.
Screw the pressure gauge onto the hex nut of
the left-hand connection (20) on the body using
a size 14 open-ended spanner.
Tighten the pressure gauge fastening to a
torque of 65 Nm.
Push the adjusting key from underneath up into
the hole of the adjuster as far as it will go.

14
Connecting the equipment
The equipment can be connected in any installation
position. Installation with a horizontal direction of
flow and the adjuster hanging down ensures
optimum function.
To ensure perfect function, make sure the following
conditions are complied with:
Install the equipment in the cooling-water return
as close as possible to the heat exchanger.
Install the equipment in a water pocket.
If the medium is dirty or contains foreign bodies,
install a dirt trap upstream of the equipment.
If there are chalk deposits, use a water softener.
If the equipment is being used as an end valve,
make sure that it cannot run empty. Otherwise,
drying out or deposits are possible.
If there is a risk of freezing, install a drainage
valve in the water pocket.
DA
NGER
Incorrectly connected equipment can
cause fatal accidents or severe injuries.

Make sure that only qualified skilled
personnel connect the equipment to
pipes.

Make sure that the flow arrow on the
equipment body matches the direction
of flow in the pipe.
Specialist personnel must be highly qualified and
fully experienced in making pipe connections for the
respective type of end connection.
CAUTION
Do not drop the equipment. If it falls down
it may cause bruises and injuries.

To transport and mount the equipment
safely use suitable lifting gear.

Connect the noose strap of the lifting
gear to the body.

Provide sufficient support for the
equipment during transport and
installation.

Wear protective safety footwear.
Lightweight equipment may be transported and
mounted without using any lifting gear.
To lift equipment the weight of which exceeds
approx. 25 kg, you need the help of a second
person or suitable lifting gear.
Your physical strength and on-site regulations and
conditions determine what weight can be lifted and
if support is required.
Attention!
Equipment will be damaged if the end
connections are undersized.

Make sure that the connections are
strong and rigid enough to support the
weight of the equipment and to
withstand the forces that occur during
operation.
Consider space required for servicing the
equipment and/or exchanging components and
observe the necessary withdrawal distance to
remove the cover. For more information on the
required withdrawal distances see section
" Dimensions and weights " on page 33.
Make sure that the pipe system of the plant is
clean.
Make sure that the equipment is free from
foreign matter.

15
Mount the equipment in the desired installation
position.
Connect the end connections of the equipment
properly to the pipes.
To operate the diaphragm actuator in an MCW 41
or MCW 41/4, the drive must be connected to a
compressed air supply provided at the installation
site. This compressed air supply must ensure a
pressure of 3 to 10 barg. It is connected to the
Ermeto GE 6-L coupling.
Make sure that the on-site compressed air line
is connected correctly.
Make sure that the equipment is safely mounted
and that all connections are made correctly.
Operation
Adjusting the cooling-water outlet
temperature
You can set the desired cooling-water outlet
temperature on the equipment to suit the operating
conditions. To do so, proceed as follows:
If necessary, push the adjusting key (21) from
underneath up into the hole of the adjuster until
it locks into place.
Read the scale value (22) on the edge (23), as
set by the adjusting key.
If the scale value does not match the desired outlet
temperature, you can change the setting. The table
overleaf contains the scale values for the outlet
temperatures of the various types of equipment.
To lower the scale value, screw the adjusting
key further into the body.
To increase the scale value, screw the adjusting
key further out of the body.
The table below provides a rough guide for
setting the desired outlet temperature during
commissioning.
To prevent unwanted adjustments, take out the
adjusting key.
Keep the adjusting key in a place accessible to
authorised personnel.
You can adjust the outlet temperature precisely
during commissioning. As the equipment requires
approximately 10–15 minutes to adapt to the
modified outlet temperature, you must always wait
15 minutes after changing the temperature setting.
Read the current outlet temperature on the
thermometer.
To raise the outlet temperature, unscrew the
adjusting key by about a quarter turn.
To lower the outlet temperature, screw the
adjusting key into the body by about a quarter
turn.
Wait 15 minutes until the system has adapted to
the new setting.
Read the current outlet temperature on the
thermometer.
Repeat the above steps until the desired outlet
temperature is displayed.

16
Desired outlet temperature [°C]
Scale
value
on
key
gauge
DN25
DN40, DN50
DN80, DN100
Equipment option
wr
ws
nr
ns
kr
ks
wr
ws
nr
ns
kr
ks
wr
ws
nr
ns
kr
ks
–
63
109
74
–
1
–
57
104
69
22
–
54
100
65
–
–
51
95
60
20
–
49
90
55
–
–
68
114
79
47
86
51
18
–
60
107
72
45
81
48
–
–
54
100
65
43
77
42
16
–
50
93
58
41
72
37
–
–
47
86
51
39
67
32
14
–
44
79
44
37
63
27
–
68
114
79
41
72
37
36
58
23
12
54
100
65
38
65
30
34
53
18
–
47
82
51
36
58
23
33
49
14
10
41
72
37
33
51
16
31
44
9
–
36
58
23
31
44
9
30
39
4
8
31
44
9
28
37
2
27
35
0
–
25
30
-5
25
30
-5
25
30
-5
6
18
16
-19
20
23
-12
20
25
-10
–
–
3
-32
–
16
-19
–
21
-14
4
–
9
-26
–
16
-19
–
–
3
-32
–
11
-24
2
–
7
-28
–
–
3
-32
0
1
The odd values in between are not indicated on the gauge.

17
Setting the bleed flow
On delivery, the bleed flow setting screw is set in
such a way that the double cone is not lifted.
To set a higher bleed flow, proceed as follows:
Turn the adjusting key (21) anticlockwise as far
as it will go.
The double cone is closed. No bleed flow is present.
The pressure gauge displays the upstream pressure
of the equipment.
Turn the setting screw (7) clockwise until the
pressure gauge indicates a drop in pressure.
The double cone is now lifted slightly.
Continue to turn the setting screw to set the
desired bleed flow.
As a rule, no more than a quarter to a half turn is
required. A full rotation lifts the double cone by
approx. 1.2 mm.
Set the outlet temperature as described on
page 15.
After operation
DANGER
If f
luid escapes personnel may suffer
severe injuries, poisoning or even loss of
life.

After working on the equipment make
sure that all connections and valves
are tight.

Make sure that the gaskets of the
body are leakproof.
DANGER
Personnel working on pipes are exposed to
safety risks and may suffer severe injuries,
poisoning or even loss of life.

Make sure that no hot or hazardous
fluid is in the equipment or the pipes.

Make sure that the pipes upstream
and downstream of the equipment are
depressurised.

Make sure that the installation is
switched off and protected against
unauthorised or unintended acti
vation.

Make sure that the equipment and the
pipes have cooled down to room
temperatures.

Wear protective clothing that is
suitable for the fluid and, if necessary,
wear protective gear.
For more information on suitable protective clothing
and safety gear refer to the safety data sheet of the
fluid in question.
When the equipment is closed, the higher-level
system parts are under operating pressure. To let
off pressure, proceed as follows:
Block off the supply lines to the equipment.

18
In the event of back pressure, you must also
block off the drainage line downstream of the
equipment.
The screw plugs opposite the thermometer and
pressure gauge feature a hole. Through this, you
can let off pressure with the screw plugs.
Slacken one of the two screw plugs slightly.
You can now hear the medium diverting through the
hole. The display on the pressure gauge changes.
Once the pressure has fully dissipated, close the
screw plug.
Only commence work once the pressure gauge
displays zero pressure.
DANGER
If the equipment is used in contaminated
areas there is a risk of severe injuries or
death caused by harmfu
l substances in or
on the equipment.

Only qualified personnel are allowed to
perform work on contaminated
equipment.

Always wear the protective clothing
prescribed for contaminated areas
when working on the equipment.

Make sure that the equipment is
completely decontaminated before
carrying out any service work.

Follow the pertinent instructions for
handling the hazardous substances in
question.
Attention!
Frost damage may occur when the
installation is shut down.

Drain the equipment if ambient
temperatures below 0 °C (frost) are to
be expected.
If there is a risk of freezing, you must
completely drain the equipment after
operation.
To do this, you can install a drainage valve
in the water p
ocket.
To drain the equipment, proceed as follows:
Make sure that medium exiting the system is
caught.
Unscrew the adjuster at the bottom out of the
body.
Medium exits the system.
Wait until the equipment has drained fully.
Remove the sealing ring from the hole.
Dispose of the sealing ring in accordance with
regulations at the location of use.
Insert a new sealing ring of the same type in the
hole.
Lubricate all threads and the contact surfaces of
nuts and bolts with temperature-resistant
lubricant.
The lubricant must have the same properties as
OKS®217.
Screw the adjuster into the body.
Using the adjuster, tighten the size 32 hex nut
to a torque of 80 Nm.
Removing external dirt deposits
To remove dirt deposits rinse the equipment
with fresh water and wipe it with a clean, lint-
free cloth.
To remove any persistent residues use a
cleaning agent that is suitable for the material
and carefully wipe the equipment with a clean,
lint-free cloth.
Maintaining the equipment
The equipment does not require any particular
maintenance.

19
Servicing the equipment and installing spare parts
You may exchange the following component parts
in case of wear or damage:
Spare parts for CW 41

20
No.
Nominal size
DN25
DN40, DN50
DN80, DN100
Name
Order number
2
Body gasket
184372
184373
184374
3
Spring
004950
004981
030001
6
Adjuster, complete
004953
8
Thermometer
184596
9
Pressure gauge
004704
11
w-thermostat1
004941
n-thermostat1
030040
k-thermostat1
030042
12
Double cone
s-cone
004940
004980
030000
r-cone, complete
with O-ring
184283
184288
184292
18
Sealing ring2
000992
21
Adjusting key
004962
24 Sealing ring DN25–50 order number 010333
DN 80–100 order number 010510
25
Circlip
010332
26
O-ring for r-double
cone
030092
030093
031493
1
Required no. of parts dependent on type:
DN25: 1x
DN40, DN50: 2x
DN80, DN100: 3x
2
For thermometers and screw plugs, 4x required
To install the pressure gauge, suitable sealing tape (19) is required in place of the sealing ring. PTFE
sealing tape may be used, for example.