wiwa Duomix 230 User manual

Translation of the original operation manual
DM230_DBK_en_1206 · rs
Operation manual
DUOMIX 230
Serial-No.
⸏ ⸏ ⸏ ⸏ ⸏ ⸏ ⸏ ⸏

Translation of the original operation manual DUOMIX 230 3
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Contents
Contents
1 Foreword........................................................................................................5
2 Safety .............................................................................................................6
2.1 Explanation of symbols................................................................................6
2.2 Safety notes.................................................................................................8
2.2.1 Operating pressure............................................................................8
2.2.2 Risks due to the spray jet ..................................................................8
2.2.3 Risks due to electrostatic charge.......................................................9
2.2.4 Explosion protection ..........................................................................9
2.2.5 Health risks......................................................................................10
2.3 Information signs on the unit......................................................................10
2.4 Safety features........................................................................................... 11
2.4.1 Safety valves ................................................................................... 11
2.4.2 Compressed air shut-off valve.........................................................12
2.4.3 Ground cable ...................................................................................12
2.4.4 Safety rupture discs.........................................................................12
2.4.5 Spray gun lock.................................................................................12
2.5 Operating and maintenance personnel......................................................13
2.5.1 Obligations of the unit owner ...........................................................13
2.5.2 Personnel qualication.....................................................................13
2.5.3 Authorized operating personnel.......................................................13
2.5.4 Personal protective equipment ........................................................13
2.6 Notes on warranty......................................................................................14
2.6.1 Conversions and alterations ............................................................14
2.6.2 Spare parts ......................................................................................14
2.6.3 Accessories......................................................................................14
2.7 Emergency procedures..............................................................................15
2.7.1 Shutting down and depressurizing the unit......................................15
2.7.2 Leakages .........................................................................................15
2.7.3 Injuries .............................................................................................15
2.7.4 Fires.................................................................................................15
3 Unit description...........................................................................................16
3.1 Intended use ..............................................................................................16
3.2 Unit conguration.......................................................................................17
3.3 Material feed ..............................................................................................20
3.3.1 Suction pipes ...................................................................................20
3.3.2 Feed drums......................................................................................20
3.3.3 Feed pumps.....................................................................................20
3.4 Mixing unit..................................................................................................21
3.4.1 Standard mixing unit........................................................................21
3.4.2 Mixing unit with separate ushing levers .........................................22
3.4.3 External mixing unit .........................................................................23
3.5 Maintenance unit........................................................................................24
3.5.1 Standard maintenance unit..............................................................24
3.5.2 Maintenance unit with remote controlled compressed air control....24

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Contents
3.6 Optional extensions and accessories ........................................................25
3.6.1 Pressure and dosing control............................................................25
3.6.2 Material heating ...............................................................................25
4 Transport, installation and assembly........................................................26
4.1 Transport....................................................................................................26
4.2 Installation location ....................................................................................27
4.3 Assembly....................................................................................................27
4.3.1 Assembling spray hose and spray gun............................................28
4.3.2 Inserting the lter elements into the high pressure lter ..................28
4.3.3 Connecting the compressed air supply............................................28
4.3.4 Grounding the unit ...........................................................................28
4.3.5 Filling in release agent and pneumatic oil........................................29
4.3.6 Assembling the hose package and the external mixing unit (optional)
29
5 Operation.....................................................................................................30
5.1 Taking the unit into service.........................................................................30
5.2 Coating.......................................................................................................31
5.2.1 Adjusting spraying pressure.............................................................32
5.2.2 Adjusting the pressure and dosing control.......................................32
5.2.3 Tips for good coating .......................................................................32
5.3 Flushing .....................................................................................................33
5.4 Pressure relief............................................................................................33
5.5 Decommissioning.......................................................................................33
5.6 Complete cleaning .....................................................................................34
5.7 Material change .........................................................................................35
5.8 Waste disposal...........................................................................................35
6 Maintenance ................................................................................................36
6.1 Regular inspections ...................................................................................36
6.2 Maintenance plan.......................................................................................37
6.3 Maintenance unit........................................................................................37
6.3.1 Checking the lubricant level in the fog oiler .....................................37
6.3.2 Checking and adjusting the fog oiler...............................................38
6.3.3 Checking and cleaning the water separator ....................................38
6.4 Check release agent for material residues ................................................38
6.5 Cleaning the lter elements in the high pressure lters .............................39
6.6 Drying the moisture lter............................................................................39
6.7 Recommended operating materials...........................................................40
6.8 Filter elements for high-pressure lters......................................................40
6.9 Special tools...............................................................................................41
7 Rectication of faults .................................................................................42
8 Technical data .............................................................................................45
8.1 Machine card .............................................................................................45
8.2 Type plates.................................................................................................45

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Foreword
1 Foreword
Dear Customer!
We are delighted that you have decided in favour of a DUOMIX 230 from our
company.
This operating manual is intended for the operating and maintenance person-
nel. It contains all the information required to working with this unit.
The owner of the unit must ensure that the operator of the unit always has
an operating manual at his/her disposal in a language he/she understands!
Safe and reliable operation of the unit requires further information in addition
to this operating manual. Read and comply with the applicable guidelines and
accident prevention instructions for your country.
In Germany, these are:
➤the “Richtlinien für Flüssigkeitsstrahler (Spritzgeräte)” (Guidelines for
Liquid Jets), issued by the Hauptverband der Gewerblichen Berufsge-
nossenschaften.
➤the BGR 500, chapt. 2.29 „Verarbeiten von Beschichtungsstoffen“ (Applica-
tion of Coating Materials),
➤the BGR 500, chapt. 2.36 „Arbeiten mit Flüssigkeitsstrahlern“ (Working
with Liquid Jets), both issued by the Berufsgenossenschaft der Gas-, Fern-
wärme- und Wasserwirtschaft.
We strongly recommend to add all relevant guidelines and accident prevention
instructions to this operating manual.
Moreover the manufacturer’s instructions and guidelines for coating or feeder
materials are to be respected at all times.
However, if you have any questions, please do not hesitate to contact us.
Excellent work results with your WIWA DUOMIX 230 wishes
WIWA Wilhelm Wagner GmbH & Co. KG.
Copyright
© 2013 WIWA
The copyright for this operating manual lies with
WIWA Wilhelm Wagner GmbH & Co. KG
Gewerbestr. 1-3 • 35633 Lahnau • Germany
Phone: [phone] • Fax: [phone] • E-Mail: [email protected] • Internet: www.wiwa.de
This operating manual is solely intended for personnel involved in preparation,operation and servicing.
It is prohibited to pass on this operating manual for reproduction, utilisation or communication of its
contents, unless this has been explicitly permitted. Infringements incur an obligation to pay damage
compensation. All rights reserved in the event of registration of the patented design, industrial design or
registered design.
This operating manual only applies in conjunction with the machine card that was given to you with
the user manual for your unit. Please check that the type plate data is identical with the information on
the machine card. Please notify us immediately if there are discrepancies, if the user manual has been
incorrectly compiled or if the type plate is missing.

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Safety
2 Safety
This unit has been designed and manufactured while taking into consideration
all safety-related aspects. It corresponds to the current standard of technology
and to applicable accident prevention regulations. The unit left the factory in
perfect condition and guarantees a high level of technical reliability and safety.
Nevertheless, there are certain risks that can arise from incorrect operation or
misuse:
➤to life and limb of the operator or third party,
➤to the unit and other material assets of the owner,
➤to the efcient working capacity of the unit.
In principle you should refrain from any work method that could affect the safety
of operating personnel and the unit. All persons involved in set-up, commis-
sioning, operation, maintenance, repair and servicing of the unit must have
read and understood the operating manual beforehand, especially the chapter
“Safety”.
Your safety is at stake!
We recommend to the owner of this unit to have this conrmed in writing.
2.1 Explanation of symbols
Safety notes warn of potential accident hazards and identify the necessary
measures to prevent accidents. In the operating manuals from WIWA safety
notes are particularly highlighted and marked as follows:
DANGER
Highlights accident hazards which if disregarding the safety note will result
most likely in severe or even fatal injuries!
WARNING
Highlights accident hazards which if disregarding the safety note can result
in severe or even fatal injuries!
CAUTION
Highlights accident hazards which if disregarding the safety note can result
in injuries!
Highlights important information for the proper use of the unit.
Disregarding this information can result in damage to the unit or to the en-
vironment.

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Safety
Depending on the hazard source different pictograms are used in safety notes
about accident hazards with risk of injury – examples:
General accident hazard
Risk of explosion from explosive atmospheres
Risk of explosion from explosive substances
Accident hazard from voltage or static electricity
Danger of crushing from moving components of the unit
Risk of burns from hot surfaces
Security orders primarily indicated to wear protective equipment. They are also
highlighted and marked as follows:
Wear protective clothing
Highlights the order to wear the prescribed protective clothing to protect
against skin injuries caused by spraying material or gases.
Use eye protection
Highlights the order to use eye protection in order to prevent your eyesigh
from being damaged by material splatter, gases, vapors or dust.
Wear ear defenders
Highlights the order to use ear defenders in order to prevent your sense of
hearing from being damaged by noise.
Use a respiratory protection mask
Highlights the order to use a respiratory protection mask in order to prevent
your respiratory tract from being damaged by gases, fumes or dusts.
Wear protective gloves
Highlights the order to wear protective gloves with lower arm protection to
protect against burn injuries caused by heated materials.
Wear protective footwear
Highlights the order to wear protective footwear to prevent injuries to the feet
due to tumbling, falling or rolling objects, and a slip on slippery surfaces.
Reading is an absolute must
Highlights references to guidelines, work and operating manuals, which must
be strictly followed.

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Safety
2.2 Safety notes
Please remember that the DUOMIX 230 works with extremely high pressures and
may cause life threatening injuries if used inappropriately!
Always observe and follow the information in this operating manual as well
as in the separate operating manuals for individual components of the unit or
the optionally available accessories.
2.2.1 Operating pressure
WARNING
Components that do not comply with the maximum permissible operating
pressure may burst and cause severe injuries.
➤The specied maximum operating pressures must generally be com-
plied with for all components. In case of varying operating pressures
the lowest value is always valid as the maximum admissible operating
pressure for the entire unit.
➤Material hoses and hose assemblies must comply with the maximum ope-
rating pressure, including the required safety factor.
➤Material hoses must be leak tight and free of kinks, signs of abrasion or
bulges.
➤Hose connections must be tight.
2.2.2 Risks due to the spray jet
WARNING
The material is discharged from the spray gun under very high pressure.
Due to its cutting effect the spray jet can cause severe injuries by penetrating
the skin or entering into the eyes.
➤Never point the spray gun at yourself, other persons or animals!
➤Do not hold your ngers or hands in front of the spray gun!
➤Do not reach with your hands into the spray jet!
WARNING
Any unintended escape of material from the spray gun can cause damage to
persons or property.
➤Always secure the spray gun, even for shortest work breaks!
➤Always make sure that the spray gun is properly secured before each use!

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Safety
2.2.3 Risks due to electrostatic charge
WARNING
The high ow velocities associated with the Airless spraying method may
cause static charging. Static discharges can cause re and explosion.
➤Always use open containers!
➤Never spray solvents or solvent containing materials into cone-top cans
or drums with bunghole!
➤Stand the containers on a grounded surface.
➤When using metal containers watch out for contact between spray gun
and container wall.
➤Only use conductive material hoses. All original material hoses from
WIWA are conductive and perfectly adapted to our units.
2.2.4 Explosion protection
WARNING
Units designed without explosion protection must not be used in workshops
that come under the explosion protection ordinance!
Explosion protected units full the explosion protection requirements of the
Directive 94/9/EC for the explosion group, unit category and temperature class
specied on the type plate or in the declaration of conformity.
The operator is responsible for determining the zone allocation according to the
Directive of EC 94/9/EC, Appendix II, no. 2.1-2.3 when observing the measures
of the responsible inspecting authority. The operator is responsible for checking
and ensuring that all technical data and markings according to ATEX corre-
spond with the necessary requirements.
Please note that several components have their own type plate with separate
marking according to ATEX. In this case the lowest explosion protection of all
attached markings applies for the entire unit. Applications where the malfunc-
tion of the unit can lead to danger to personnel must be provided with respec-
tive safety measures by the operator.
However, if agitators, heaters or other electrically accessories are additionally
mounted, one must check the explosion protection. Plugs for heaters, agitators,
etc. that do not have explosion protection, may only be plugged in outside of
areas that fall under the explosion protection ordinance, even if the accessory
equipment as such is explosion protected.

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Safety
2.2.5 Health risks
Follow the safety notes and dosing information of the manufacturer and the
generally applicable regulations when handling paints, solvents, oils, grea-
ses and other chemical substances. Rests of paints, solvents, oils, greases
and other chemical substances must be collected in accordance with statut-
ory provisions concerning recycling and waste disposal. The ofcial local
waste water laws are valid.
CAUTION
Depending on the materials being applied solvent vapours may be genera-
ted which could cause damage to health and objects.
➤Always ensure sufcient aeration and ventilation at the workplace.
➤Always observe the processing instructions issued by the material manu-
facturers.
CAUTION
Solvents or other harmful substances are not suitable to clean your skin and
can result damage to health.
➤Use only appropriate skin protection, skin cleaning and skin care products.
In closed or pressurized systems dangerous chemical reactions may occur
if parts made of aluminium or galvanized parts come into contact with 1.1.1 -
trichloroethane, methylene chloride or other solvents containing halogenated
hydrocarbons (CFC’s). If you want to process materials containing the afore
mentioned substances, we recommend to consult the material manufacturer to
clarify the usability of such substances.
For these materials we have a range of rust and acid proof versions available.
2.3 Information signs on the unit
Information signs attached to the unit, such as
safety information (see Fig. 1) refer to possible
danger areas and must be strictly followed.
They must not be removed from the unit.
Damaged and illegible information signs must be
replaced immediately.
Apart from this you should also read and follow
the safety notes in the operating manual!
Fig. 1: Safety Information

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Safety
2.4 Safety features
Safety features must be checked with the unit depressurized:
➤before initial commissioning,
➤always before starting work,
➤after completion of setup work,
➤after cleaning, maintenance and repair work!
Check list:
5Lead seal on the safety valve still intact?
5Safety valves externally free of damage?
5Function of compressed air shut-off valve correct?
5Ground cable free of damage?
5Ground cable connections on unit and conductor in good condition?
5Correct functioning of safety levers on spray gun?
WARNING
If one of the safety features is missing or not fully functional, the operating
safety of the unit cannot be guaranteed!
➤If you discover any faults on the safety features or other deciencies on
the unit, stop operation of the unit immediately.
➤Only resume operation of the unit after the fault has been completely
rectied.
2.4.1 Safety valves
The DUOMIX 230 is equipped with safety valves in the
air motors of the main pump (see Fig. 2), the ushing
pump and the feed pumps (if present).
The safety valves ensure that the max. permissible air
inlet pressure is not exceeded. If the air inlet pressure
exceeds the xed limiting value at one of the points
mentioned above, the corresponding safety valve will
blow off. Fig. 2: Safety valve
WARNING
If the maximum permissible air inlet pressure is exceeded, components may
burst. This may result in damage to persons and property.
➤Never allow the unit to run without or with defective safety valves!
➤If a safety valve needs to be replaced, you can nd the corresponding
order number on the machine card.
➤When using new safety valves make sure that the valves have been set
to the max. permissible air inlet pressure of the DUOMIX 230 as required
for the mixing ratio (see type plate or machine card) and sealed with a
lead seal.
Changing the mixing ratio may cause a change in pressure ratio and thus
require the adaptation of the max. permissible air inlet pressure of the main
pump. In this case you would have to replace the safety valve of the main
pump and the type plate – you should absolutely contact WIWA.

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Safety
2.4.2 Compressed air shut-off valve
The compressed air shut-off valve on the air main-
tenance unit interrupts the air supply for the entire
unit. Once the air supply is cut off, the unit is still
under pressure.
The pressure relief of the unit must be done by
the spray gun and the return ow ball valve on the
high pressure lters. Fig. 3: Compressed air shut-off
valve
2.4.3 Ground cable
The unit must be grounded to an electrically con-
ductive object with the ground cable, to prevent
electrostatic charging. Adhesive labels on the
high pressure lters expressly inform about the
required grounding.
Please order the ground cable immediately (order-
no.: 0474487) if lost or damaged. Fig. 4: Ground cable
2.4.4 Safety rupture discs
Die Berstscheiben verhindern ein deutliches Über-
schreiten des zulässigen Betriebsdrucks.
Sie benden sich in der Verschraubung hinter den
Hochdruckltern.
If a safety rupture disc is damaged material will
escape into the collecting vessel of the rupture
disc safety system. Fig. 5: Safety rupture disc
In this case the safety rupture disc must be replaced immediately. You nd the
corresponding ordering data on the machine card. A new safety rupture disc
must be installed with the coloured side facing towards the pressure.
2.4.5 Spray gun lock
The spray gun must always be secured against
unintended operation, even for the shortest of
work breaks.
Set the safety lever horizontally to secure the
spray gun.
Fig. 6: Spray gun lock

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Safety
2.5 Operating and maintenance personnel
2.5.1 Obligations of the unit owner
The owner of the unit:
➤is responsible for training the operating and maintenance personnel,
➤must direct the operating and maintenance personnel to handle the unit
appropriately and to wear correct work clothes and protective equipment,
➤must make the user manual accessible to the operating and maintenance
personnel and ensure that it remains available at all times,
➤must ensure that the operating and maintenance personnel have read and
understood the user manual.
Only then the unit may be taken into service.
2.5.2 Personnel qualication
A differentiation is made between two groups of people in dependence on their
qualications:
➤Instructed operators have been veriably instructed by the unit owner in the
activities they are tasked with and the potential risks connected with them
in the case of incorrect behaviour.
➤Trained personnel have been instructed by the unit manufacturer such that
they are capable of carrying out maintenance and repair work on the unit
and recognising potential risks on their own initiative and of avoiding these
risks.
2.5.3 Authorized operating personnel
Activity Qualication
Setup and operation Instructed operators
Cleaning Instructed operators
Servicing Trained personnel
Repair Trained personnel
Juveniles under the age of 16 have no permission to operate this unit.
2.5.4 Personal protective equipment
Wear protective clothing
Always wear the protective clothing prescribed for your work environment
(mining, closed rooms, etc.) and follow the recommendations in the safety
data sheet issued by the material manufacturer.
Use eye protection
Wear protective goggles to protect against eye injuries caused by material
splatter, gases, vapors or dust.

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Safety
Wear ear defenders
Operating personnel should be provided with suitable noise protection equip-
ment. The operator is responsible for adhering to the accident prevention
regulation “Noise” (BGV B3). For this purpose, pay special attention to the
conditions of the installation location – the noise burden will increase if the
unit is installed in or on hollow bodies.
Use a respiratory protection mask
We strongly recommend to wear a respiratory protection mask, even though
the paint mist has been minimized in Airless spray painting applications with
correct pressure setting and working mode.
Wear protective gloves
When applying heated materials you should wear protective gloves with low-
er arm protection to prevent burns.
Wear protective footwear
Wear protective footwear to prevent injuries to the feet due to tumbling, fal-
ling or rolling objects, and a slip on slippery surfaces.
2.6 Notes on warranty
2.6.1 Conversions and alterations
➤Unauthorized conversions or alterations should not be undertaken on safe-
ty grounds.
➤Protective equipment should not be dismantled, converted or bypassed.
➤The unit should only be operated within the prescriptive limit values and
parameters.
2.6.2 Spare parts
➤For the maintenance and repair of the unit only original spare parts from
WIWA may be used.
➤If you use spare parts not manufactured or supplied by WIWA, any warran-
ty and liability will become null and void.
2.6.3 Accessories
➤If you use original accessories from WIWA, their suitability for use with our
units is guaranteed.
➤If you use foreign accessories, they must be suitable for the unit – especial-
ly with regard to the operating pressure, the power connection data and the
connection sizes. WIWA will not be liable for any damage or injury caused
by these parts.
➤It is, however, mandatory to respect the safety regulations of the accesso-
ries. You will nd these safety regulations in the corresponding operating
manuals for the accessories.

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Safety
2.7 Emergency procedures
2.7.1 Shutting down and depressurizing the unit
In case of emergency, you must shut down and depressurize the unit immedi-
ately.
1. Close the compressed air shut-off valve on the air maintenance unit.
2. Set the levers at the mixing unit to „Circulate“.
3. Operate the spray gun until the material pressure is relieved completely.
2.7.2 Leakages
WARNING
In case of leakages material can escape under very high pressure and
cause serious bodily injuries and material damage.
➤Shut down and depressurize the unit immediately.
➤Re-tighten the connections and replace defective components (only by
trained personnel).
➤Do not seal leakages on connections and high pressure hoses by hand
or by wrapping fabric around them.
➤Do not repair material hoses!
➤Check hoses and connections for leaks before restarting.
2.7.3 Injuries
In case of injuries you should immediately consult a physician or visit the
nearest hospital. If injured by processing materials or solvents always have the
safety data sheet (address, phone number, material designation and material
number of supplier or manufacturer) available for the attending physician.
➤Always remember where you can call for help.
➤Keep a list of the local emergency telephone numbers at hand.
➤You should in any case make yourself familiar with First-Aid measures.
2.7.4 Fires
➤Read and comply with the instructions for re alarm and escape routes,
which are displayed in your factory or at any work place.
➤Keep a list of the local emergency telephone numbers at hand.
➤Become acquainted with the locations and operation of re alarms and re
extinguishers within your reach.
➤Ensure a sufcient amount of information signs for the avoidance of re.
➤Only use the extinguishing substances stipulated by the material manufac-
turer.

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Unit description
3 Unit description
The WIWA DUOMIX 230 is a dual component spray painting and coating unit.
Exact metering of both components is assured by the xed mixing ratio. The
mixing ratio can be changed by exchanging the material pumps.
For the application of materials with higher viscosities the unit can be equipped
with optional accessories (e.g. feed hoppers, feed pumps, material preheating
systems or material ow heaters).
Please refer to the enclosed machine card (technical data) for the specica-
tions of your unit.
3.1 Intended use
The WIWA DUOMIX 230 is intended for the application of low, medium and high
viscosity spray painting and coating materials for commercial and industrial
applications.
Any other use is considered unintended. Should you intend to use the unit
for other purposes or with other materials and thus not for the purpose it is
intended for, you must ask WIWA for permission – otherwise warranty will
become null and void.
Intended use also includes compliance with the technical documentation
and adherence to the prescribed operating, servicing and maintenance
guidelines.

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Unit description
3.2 Unit conguration
Due to its modular design the WIWA DUOMIX 230 offers individual solutions for
almost all possible areas of application. The units shown in Fig. 7 and 8 are
examples for the manifold installation and extension variants.
Fig. 7: Example of a DUOMIX 230 on an upright rack
12
3
4
5
6
7
9
8
10
12
13
11
8
No. Designation
1 Air motor of main pump
2High pressure lter
3 Contact pressure gauge of pressure and dosing control
4Lever to open and close the return ow
5 Control cabinet of pressure and dosing control
6Mixing unit with separate ushing levers
7 Material pumps of main pump
8 Collecting vessel for safety rupture disc safety device
9 Spraying hose connection
10 Rack
11 Maintenance unit
12 Material Flow Heater
13 Flushing pump

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Unit description
Fig. 8: Example of a DUOMIX 230 on a 2-wheel rack
1
2
5
7 8
9
10
11
12
13
14
3
4
6
Nr. Designation
1 Flushing pump
2 Maintenance unit
3 Compressed air shut-off valve
4 2-wheel rack
5 Collecting vessel for safety rupture disc safety device
6 Suction pipes of main pump
7Main pump with mufer, air motor and material pumps for A- and B
component
8High pressure lter
9Lever to open and close the return ow
10 Control cabinet of pressure and dosing control
11 Standard mixing unit
12 Return hoses for A- and B component
13 Static mixer
14 Spraying hose connection

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Unit description
Fig. 9: Example of a DUOMIX 230 on a 3-wheel rack
2
8
4
6
7
7
9
1
13
12
5
11
11
3
10
10
No. Designation
1 Air motor of main pump
2High pressure lter
3 Contact pressure gauge of pressure and dosing control
4 Remote controlled compressed air control unit
5 Control cabinet of pressure and dosing control
6Lever to open and close the return ow
7 Return hoses for A- and B component
8 Maintenance unit
9 External mixing unit on rack
10 Feed drum
11 Collecting vessel for safety rupture disc safety device
12 3-wheel rack
13 Ground cable with clamp

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Unit description
3.3 Material feed
For feeding material to the material pumps you may use suction pipes, feed
drums or feed pumps.
3.3.1 Suction pipes
Suction pipes are directly placed
into the material drums.
The suction pipe is tted with a
sieve, which needs to be cleaned at
regular intervals.
No. Designation
1 Suction pipe
2 Suction system with sieve Fig. 10: Suction pipes
1
2
3.3.2 Feed drums
Feed drums are mounted to the rack
of the unit. The feed of material from
the feed drum to the material pump
can be interrupted by means of a
ball valve. With the drain valve any
material residues can be drained
from the feed drums.
No. Designation
1 Feed drum
2 Stop cock Fig. 11: Feed drums
1
2
3.3.3 Feed pumps
Feed drums are connected to the
compressed air supply of the main-
tenance unit via the pressure distrib-
utor and are controlled by a dedi-
cated air pressure regulator. They
support the material pumps when
pumping highly viscous materials.
Piston pumps (Fig. 12) or dia-
phragm pumps (Fig. 13) can be
used as feed pumps.
No. Designation
1 Compressed-air regulator
2 Ball valve
3 Suction pipe
Fig. 12:
Piston pump
Fig. 13:
Diaphragm pump
1
2
1
2
3 3