TapFlo T/TX30 User manual

Sanitary Series
Diaphragm Pumps
Original Instruction
2020 | 1
edition 2019 rev 1
Read this instruction manual carefully,
before you install and operate the pump
Pump models:
T/TX30
T/TX80
T/TX125
T/TX225
T/TX425
T/TX825
IOM manual

CONTENTS
IOM manual - Sanitary series 2
0. GENERAL......................................................................................................................................... 7
0.1. Introduction................................................................................................................................ 7
0.2. Warning symbols ....................................................................................................................... 7
0.3. Qualification and training of personnel................................................................................... 7
1. INSTALLATION ............................................................................................................................... 8
1.1. Operation principle.................................................................................................................... 8
1.2. Receiving inspection.................................................................................................................. 8
1.3. Lifting and transportation......................................................................................................... 9
1.4. Storage........................................................................................................................................ 9
1.5. Foundation ................................................................................................................................. 9
1.6. Suction and discharge piping ................................................................................................... 9
1.6.1. Connection of suction pipe ............................................................................................. 10
1.6.2. Connection of discharge pipe ......................................................................................... 10
1.7. Health and safety ..................................................................................................................... 10
1.7.1. Protection ......................................................................................................................... 10
1.7.2. Explosion hazardous environments ATEX................................................................... 11
1.7.3. Air pressure....................................................................................................................... 12
1.7.4. Noise level ........................................................................................................................ 12
1.7.5. Temperature hazards....................................................................................................... 12
1.8. Air connection .......................................................................................................................... 12
1.8.1. Air treatment system ....................................................................................................... 13
1.8.2. Air quality classes............................................................................................................. 13
1.9. Installation example ................................................................................................................ 14
1.10. Recommended installations................................................................................................ 14
1.10.1. Flooded ............................................................................................................................. 14
1.10.2. Self-priming...................................................................................................................... 14
2. OPERATION .................................................................................................................................. 15
2.1. Before starting the pump........................................................................................................ 15
2.2. Starting and operation ............................................................................................................ 15
2.2.1. Dry running ...................................................................................................................... 15
2.2.2. Optimization of the pump lifetime ................................................................................ 15
2.3. Pump stopping......................................................................................................................... 16
2.4. Cleaning of the pump .............................................................................................................. 16
2.4.1. CIP Cleaning In Place .................................................................................................... 16
2.4.1.1. Drainage of the pump (T80 T825) ........................................................................... 17

CONTENTS
IOM manual - Sanitary series 3
2.5. Residual risks............................................................................................................................ 17
2.6. Disposal after expiration of the expected lifetime ............................................................... 17
2.7. Actions in emergency .............................................................................................................. 17
3. MAINTENANCE ............................................................................................................................ 18
3.1. When the pump is new or reassembled................................................................................. 18
3.1.1. Performance test.............................................................................................................. 18
3.2. Routine inspection ................................................................................................................... 18
3.3. Complete inspection ................................................................................................................ 18
3.4. Location of faults ..................................................................................................................... 19
3.5. T30 Disassembly of the pump.............................................................................................. 20
3.5.1. Before the disassembly procedure ................................................................................. 20
3.5.2. Disassembly procedure.................................................................................................... 20
3.6. T30 Assembly of the pump .................................................................................................. 23
3.6.1. Test run ............................................................................................................................. 24
3.7. T80-T425 Disassembly of the pump .................................................................................... 25
3.7.1. Before the disassembly procedure ................................................................................. 25
3.7.2. Disassembly procedure.................................................................................................... 25
3.8. T80-T425 assembly of the pump ......................................................................................... 29
3.8.1. Test run ............................................................................................................................. 30
3.9. T825 Disassembly of the pump............................................................................................ 31
3.9.1. Before the disassembly procedure ................................................................................. 31
3.9.2. Disassembly procedure.................................................................................................... 31
3.10. T825 assembly of the pump ............................................................................................. 34
3.10.1. Test run ............................................................................................................................. 35
4. OPTIONS ....................................................................................................................................... 36
4.1. Valve options............................................................................................................................ 36
4.1.1. Flap valves ........................................................................................................................ 36
4.1.2. Ball cup valves .................................................................................................................. 37
4.2. Heating jacket .......................................................................................................................... 37
4.3. Magnetic ball lifters................................................................................................................. 38
5. SPARE PARTS................................................................................................................................ 39
5.1. T30 Spare parts drawing....................................................................................................... 39
5.2. T30 Spare parts list................................................................................................................ 40
5.3. T80-T125 Spare parts drawing............................................................................................. 41
5.4. T80-T125 Spare parts list...................................................................................................... 42
5.5. T80 T125 Spare parts options ........................................................................................... 43

CONTENTS
IOM manual - Sanitary series 4
5.6. T225-T425 Spare parts drawing........................................................................................... 46
5.7. T225-T425 Spare parts list.................................................................................................... 47
5.8. T225 T425 Spare parts options ......................................................................................... 48
5.9. T825 Spare parts drawing .................................................................................................... 51
5.10. T825 Spare parts list ......................................................................................................... 52
5.11. T825 Spare parts options.................................................................................................. 53
5.12. Stocking recommendation.................................................................................................. 54
5.13. How to order parts............................................................................................................... 54
5.14. Pump code............................................................................................................................ 55
6. DATA ............................................................................................................................................. 56
6.1. Capacity curves......................................................................................................................... 56
6.2. Capacity changes...................................................................................................................... 57
6.3. Dimensions ............................................................................................................................... 57
6.4. Technical data .......................................................................................................................... 59
6.5. Tightening torques .................................................................................................................. 59
6.6. Permitted loads on manifolds................................................................................................. 59
7. WARRANTY .................................................................................................................................. 61
7.1. Warranty form.......................................................................................................................... 61
7.2. Returning parts ........................................................................................................................ 62
7.3. Warranty ................................................................................................................................... 62

www.tapflo.com
EC DECLARATION OF CONFORMITY 01/EC/SAN/2020
Series:
30805555
Manufactured by:
Tapflo AB
Filaregatan 4
44den
This declaration of conformity is issued under the sole responsibility of the manufacturer.
Object of declaration: SANITARY AIR OPERATED DIAPHRAGM PUMPS
The object of the declaration described above is in conformity with the relevant Union
harmonisation legislation:
•Directive 2006/42/EC of European Parliament and of the Council of 17 May 2006 on
machinery, amending Directive 95/16/EC;
 authorized to compile the technical file.
Tapflo Sp. z o.o.
ul. Czatkowska 4b
83-110 Tczew
Signed for and on behalf of Tapflo AB

Managing director
, 28.10.2020

www.tapflo.com
EU DECLARATION OF CONFORMITY 02/ATEX/AODD/2020
Series:




Manufactured by:
Tapflo AB
Filaregatan 4

This declaration of conformity is issued under the sole responsibility of the manufacturer.
Object of declaration: CONDUCTIVE AIR OPERATED DIAPHRAGM PUMPS DESIGNED FOR USE
IN POTENTIALLY EXPLOSIVE ATMOSPHERES
The object of the declaration described above is in conformity with the relevant Union
harmonisation legislation:
•Directive 2006/42/EC of European Parliament and of the Council of 17 May 2006 on
machinery
•Directive 2014/34/EU of the European parliament and of the council of 26 February 2014
on Equipment or Protective System intended for use in potentially explosive atmospheres
Applied harmonised standards:
•EN ISO 80079-36:2016-07
•EN ISO 80079-37:2016-07
ATEX marking:
II 2G Ex h IIC 
II 2D Ex h IIIC T60ººC Db
Notified body J.S. Hamilton Poland Sp. z o.o. (2057) performed EU-type examination and
issued certificate JSHP 19 ATEX 0018X.
Signed for and on behalf of Tapflo AB

Managing Director
, 28.10.2020


0. GENERAL
IOM manual - Sanitary series 7
0. GENERAL
0.1. Introduction
The Tapflo Air Operated Diaphragm Pump range is a complete series of pumps for industrial
applications. The pumps are designed to be safe, simple and easy to use and maintain. The
construction is seal-less and without rotating parts. The pumps are suitable for a variety of
duties in hygienic installations.
With proper attention to maintenance, Tapflo Pumps will give efficient and trouble free
operation. This instruction manual will familiarise operators with detailed information about
installing, operating and maintaining of the pump.
0.2. Warning symbols
The following warning symbols are present in this instruction manual. This is what they say:
This symbol stands next to all safety instructions in this instruction manual where
danger to life and limb may occur. Observe these instructions and proceed with
utmost caution in these situations. Inform also other users of all safety
instructions. In addition to the instructions in this instruction manual, the general
safety and accident prevention regulations must be observed.
This signal stands at points in this instruction manual of particular importance
for compliance with regulations and directives, for correct work flow and for the
prevention of damage to and destruction of the complete dampener or its
subassemblies.
0.3. Qualification and training of personnel
The personnel in charge of installation, operation and maintenance of the pumps we
produce must be qualified to carry out the operations described in this manual. Tapflo shall
not be held responsible for the training level of personnel and for the fact that they are not
fully aware of the contents of this manual. In case any instructions in this manual are unclear
or any information is lacking, please contact Tapflo before handling the pump.

1. INSTALLATION
IOM manual - Sanitary series 8
1. INSTALLATION
1.1. Operation principle
The Tapflo diaphragm pump is driven by compressed air. The two diaphragms are connected
by a diaphragm shaft and pushed back and forth by alternately pressurising the air chambers
behind the diaphragms using an automatically cycling air valve system.
The Suction Cycle:
➢Suction
One diaphragm creates a suction action in one chamber (on the right) when being pulled
back from the housing.
➢Discharge
The other diaphragm simultaneously transmits the air pressure to the liquid in the second
chamber (on the right) of the housing, pushing it towards the discharge port.
During each cycle the air pressure on the back of the discharging diaphragm is equal to the
head pressure on the liquid side. Tapflo diaphragm pumps can therefore be operated against
a closed discharge valve with no negative effect to the life of the diaphragms.
1.2. Receiving inspection
Although precaution is taken by us when packing and shipping, we urge you to carefully check
the shipment on receipt. Make sure that all parts and accessories listed on the packing list are
accounted for. Immediately report any damage or shortage to the transport company and to
us.

1. INSTALLATION
IOM manual - Sanitary series 9
1.3. Lifting and transportation
Before handling the pump check the weight of the pump (see 6.4. Technical data). Refer to
Your local standards on how to handle the pump. If the weight is excessive to transport by
hand it must be lifted using slings and a suitable lifting device e.g. a crane or forklift.
Always use at least two slings and make sure they are secured in such a way to prevent the
pump from slipping and that the pump unit is hanging straight.
Never lift the pump with only one sling. Incorrect lifting can cause serious injury and/or
damage to the pump.
Never lift the pump under pressure.
Be careful that nobody passes under the pump when lifted.
Never try to lift the pump by the hoses attached to the pump.
As an option pumps can be equipped with lifting eyebolts connected with the pump housing.
1.4. Storage
If the equipment is to be stored prior to installation, place it in a clean location. The pump

below 65%. It should not be exposed to any heat source e.g. radiator, sun as this could result
in a negative way on the tightness of the pump. Do not remove the protective covers from the
suction, discharge and air connections which have been fastened to keep pump internals free
of debris. Clean the pump thoroughly before installation.
1.5. Foundation
The support of the pump is furnished with mounting holes. Fix the pump on a stable
foundation, which is able to absorb vibrations. It is essential for the operation of the pump to
mount the pump with the feet in a downward direction (see in chapter 1.10 “Recommended
installations”).
1.6. Suction and discharge piping
Suction and discharge piping should be fully supported and anchored near to but independent
of the pump. The piping to the pump should be a hose, to prevent undue stress and strain on
the pump connections and the piping.

1. INSTALLATION
IOM manual - Sanitary series 10
1.6.1. Connection of suction pipe
Remember that the suction pipe/connection is the most critical point, especially if the pump
is priming. Just a small leakage will dramatically reduce the suction capability of the pump.
When connecting the suction pipe, following is recommended.
1)
For satisfactory operation, use reinforced hose (the suction power may otherwise
shrink the hose) or other flexible piping. The internal diameter of the hose should be
the same as on the suction connection (at the bottom of the pump) to have best
suction capability.
2)
Make sure that the connection hose - pump is completely tight, otherwise the suction
capability will be reduced.
3)
Always use as short suction pipe as possible. Avoid air pockets which can arise with
long piping.
1.6.2. Connection of discharge pipe
For this connection it is only recommended a simple and positive flow connection. Use a hose
or flexible piping (minimum one meter) between the discharge connection and any rigid fixed
piping. Coil the hose at least one turn. All components (hose, pipe, valves etc.) on the discharge
piping must be designed for minimum PN 10.
1.7. Health and safety
The pump must be installed according to local and national safety rules.
The pumps are constructed for particular applications. Do not use the pump on
applications different from that for which it was sold without consulting us to ascertain
its suitability.
1.7.1. Protection
In the interest of health and safety it is essential to wear protective clothing and safety goggles
when operating, and/or working in the vicinity of Tapflo pumps.

1. INSTALLATION
IOM manual - Sanitary series 11
1.7.2. Explosion hazardous environments ATEX
The standard Sanitary series pumps are not allowed to operate in environments where there
is danger of explosion. Static electricity may occur in the pump under operation, which may
cause explosion and injury. Special conductive TX pumps are available for such applications.
Follow below instructions and local/national rules for safe use.
ATEX (directive 2014/34/EU) classification of Tapflo TX pumps:
II 2G Ex hIIC T6T4 Gb
II 2D Ex hIIIC T60ºCT125ºCDb
Equipment group: II all other explosive areas than mines;
Category group: 2high level of protection (can be used in zone 1);
Atmosphere: Ggas;
D dust;
Explosion group: IIC gas group (such as acetylene, hydrogen);
IIIC dust group (conductive dusts);
Type of protection: hcontrol of ignition sources;
Temperature class: T4, T6 in the event of a malfunction, the maximum temperature of
asurface that may be exposed to gas T4 , T6 = 85;
EPL protection level: Gb, Db high protection.
Temperature classes and allowable temperatures
The temperature class of the pump depends on the temperature of the pumped medium.
Medium temperature
Pump max surface temperature
Temperature class
-C C


T6 - 


T6 - 


T5 - 


T4 - 
If ambient temperature exceeds the range -C C, contact Tapflo.
Earth connection of the pump and other equipment
Connect a suitable earth wire to the stainless steel earth connection that is placed on the inside
of one of the pump housings. Connect the other end of the earth wire to earth and also make
sure that other equipment like hoses/pipes/containers etc. are properly earthed/connected.
Antistatic surface
Pumps in ATEX execution should be cleaned in order to preserve antistatic properties. Layer
of dust or other solid particles on the outer surfaces is unacceptable
Dry run in ATEX pump
ATEX approved pumps can run dry without increasing the risk of creating potential ignition
sources. Nevertheless, dry run periods should be decreased to minimum as they increase the

1. INSTALLATION
IOM manual - Sanitary series 12
wear of parts inside of the pump. What is more, when running dry (e.g. during self-priming)
the pump should run at a low speed controlled via a needle valve.
1.7.3. Air pressure
The maximum air pressure for Tapflo pumps is 8 bar. Higher air pressure than 8 bar can
damage the pump and may cause injury to personnel in vicinity of the pump. If you intend to
apply a higher air pressure than 8 bar, please consult us.
1.7.4. Noise level
At tests, the noise level from a Tapflo pump has not exceeded 85 dB(A). Under some
circumstances, for example if the pump is operating under high air pressure at low discharge
head, the noise can be inconvenient or hazardous for personnel staying for long periods in
the vicinity of the pump. This hazard can be prevented by:
➢using suitable ear protection;
➢lowering the air pressure and/or raising the discharge head;
➢leading out the outgoing air from the room by connecting a hose to the muffler
connection of the pump;
➢using elastomer valve balls (EPDM, NBR or polyurethane) instead of PTFE, ceramic or
stainless steel, provided that the elastomer is compatible with the pumped liquid.
1.7.5. Temperature hazards
➢Raised temperature can cause damage on the pump and/or piping and may also be
hazardous for personnel in the vicinity of the pump/piping. Avoid quick temperature
changes and do not exceed the maximum temperature specified when the pump was
ordered. See also general max temperatures based on water in chapter 6. “DATA”.
➢When the pump is exposed to ambient temperature variations or if there is big difference
between the temperature of the product and the surrounding, the tightening torques of
the housing nuts should be checked periodically as part of preventive maintenance. Please
contact Tapflo for tightening intervals recommendation.
➢If a hot product is pumped, the pump should not stand still when filled for a longer period
of time. This could cause leakage from the valves and contamination and/or damage of
the air valve.
➢ated wear
of parts made of these materials. This is a hazard that has to be accepted when pumping
such cold products. Also in such case, when a pump is not operational it should be drained
of all liquid.
➢Bear in mind that the viscosity of the product changes with temperature. This has to be
taken into consideration when selecting the pump.
1.8. Air connection
Screw the air hose into the air intake on the centre block of the pump with for example a
bayonet coupling. For best efficiency, use the same hose diameter as the internal diameter of
the connection on the air intake.

1. INSTALLATION
IOM manual - Sanitary series 13
1.8.1. Air treatment system
The air valve is constructed for oil-free air. Lubrication of the air is not allowed. However, if
the air is very dry (laboratory air), we recommend to use a plastic air valve. Maximum air
pressure is 8 bar. As prevention purpose, a filtration of the air by means of a 5 micron filter or
finer is recommended. Recommended air quality according to PN-ISO8573-1:2010 is particles
class 6, water class 4 and oil class 4. Dirt in the air can under unfortunate circumstances be the
cause of a breakdown.
To facilitate the operation of the pump we recommend an air treatment system connected to
the air supply. These components should be included:
1) Regulator to adjust the air pressure;
2) Manometer to read the actual pressure;
3) Needle valve to adjust the air flow (especially when operating the pump in the lower range
of performance);
4) Filter.
Air treatment system which can be ordered from
us.
1.8.2. Air quality classes
ISO 8573-1:2010 Compressed Air Contaminants and Purity Classes
Class
Solid particles
Water
Oil
Maximum number of particles

Mass
concentration

Pressure
dew point

Liquid

Total oil content
(liquid, aerosol and
vapour)

0.1 0.5

0.5 1

1 5 
0
As specified by the equipment user or supplier and more stringent than class 1
1






0.01
2






0.1
3

90,000
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1. INSTALLATION
IOM manual - Sanitary series 14
1.9. Installation example
1) Gate valve compressed air
2) Filter and pressure regulator
3) Flexible hose
4) Needle valve
5) Flexible piping
6) Gate valve suction
7) Gate valve discharge
8) Coiled flexible piping
9) Flow gauge
1.10. Recommended installations
The Tapflo pump is flexible in the way you are able to install it.
1.10.1. Flooded
The piping system is designed with a positive suction head. This is the best way of installation
where it is necessary to completely evacuate all liquid from the container, or where viscous
(thick) products are transferred.
NOTE! Do not exceed 0,7 bar suction pressure! Higher pressure may cause premature
diaphragm failure and irregular pump operation.
1.10.2. Self-priming
The Tapflo pump is designed to pull a high vacuum. It is able to evacuate an empty suction
pipe without any damage to the pump. The suction lift is up to 5 meters (16.4 ft.) from an
empty suction pipe and up to 8 meters (26.2 ft.) from a wetted pipe. The suction capability
depends on the pump size (see chapter 6. “Data”).
NOTE!
Even if all above safety instructions are met and complied with, there still exists a minor danger
in the event of a leakage or mechanical damage of the pump. In such case the pumped product
can emerge on sealing areas and connections.

2. OPERATION
IOM manual - Sanitary series 15
2. OPERATION
2.1. Before starting the pump
➢Make sure the pump is installed according to the installation instruction (chapter 1).
➢Fully open all valves on suction line. Leaving the suction valve closed leads to
premature diaphragm failure.
➢When installation is new or reinstalled, a test run of the pump with water should be
conducted to make sure that the pump operates normally and does not leak.
➢When installation is new or reinstalled, check the pump housing nuts tightening torque
(see chapter 6.5 “Tightening torques”). After approximately one week of operation, the
torque should be checked again. Contact Tapflo for further tightening intervals
recommendation. This is important to prevent possible leakage.
2.2. Starting and operation
➢Open the discharge valve.
➢Note! Considering the suction capacity when air is still in the suction pipe, it is
recommended to start with low air pressure/flow (slowly) at the beginning. This
is not necessary if the pump is filled with liquid before start.
➢When the pump has been filled with liquid, the air pressure/flow may be raised in order
to increase the suction capacity of the pump.
➢The performance of the pump can be adjusted through the air supply by using a needle
valve and a pressure regulator. The performance can also be adjusted by normal flow
control on the discharge side of the system.
2.2.1. Dry running
Although the pump is prepared for dry running it is important to have in mind that long
periods of dry run may cause damage to the air valve and circlips. Also an empty pump
should operate at low speeds controlled by a needle-valve.
2.2.2. Optimization of the pump lifetime
➢Running at full frequency (maximum air pressure/flow) continuously will cause
premature wear of the components. When there is possibility of the pump running dry
or/and at full frequency it is recommended to use an air valve with a PET piston. As a
general rule, we recommend to run at half of the maximum capacity of the pump. For
instance, a T80 pump should run continuous at maximum 40 l/min.
➢As stated in chapter 1.8.1 Tapflo recommends to use an appropriate air treatment

➢If the air humidity is high, use of a water separator or air dryer is recommended.
Otherwise on the air discharge side due to decompression, icing on the muffler can
appear causing it to shrink and eventually it can shoot out of its socket.

2. OPERATION
IOM manual - Sanitary series 16
➢If the ambient air is humid, icing can occur outside of the muffler. In such case it is
recommended to use a longe
➢If icing / freezing is still a problem with the standard muffler, we recommend using our
heavy duty metal muffler. Contact us for more information.
2.3. Pump stopping
The pump can be stopped in two ways:
1) By closing of the discharge valve. The pressure from the system will stop the pump
automatically. The pump restarts easily when the valve is opened again.
NOTE! When using this method keep in mind that air must be supplied to the pump.
This is essential to keep the diaphragms in balance what protects them from premature
failure.
2) By cutting off the air supply.
NOTE! When using this method make sure that the discharge valve is opened to relief
the pumps pressure.
2.4. Cleaning of the pump
2.4.1. CIP Cleaning In Place
The importance of easy cleaning is essential in hygienic applications. Tapflo aseptic pumps
are designed for CIP (Cleaning In Place) and SIP (Sterilization In Place). This allows the pump
to be internally cleaned without disassembly. The pump can be cleaned by flushing through
with a CIP fluid (usually a mild solution of sodium hydroxide and a sanitizing additive) or by

             
permitted. Make sure that the CIP fluid is compatible with the materials in the pump/piping.
During CIP and SIP pump must run slowly (1-2 strokes per second) to obtain pressure
balance on both sides of the diaphragm. Lack of pressure balance will have influence on
 of the forced flow should be, the same as during normal
operation, from the inlet to the outlet. Contact us for more information.

2. OPERATION
IOM manual - Sanitary series 17
2.4.1.1. Drainage of the pump (T80 T825)
After the CIP procedure, the pump usually has to be
drained from the CIP fluid. The Tapflo sanitary series is

the pump unit.
1) Disconnect the pump from the piping.
2) Simply loosen the two socket head cap screws (pos. 174
see chapter 5. “SPARE PARTS”), 
and let the remaining fluid drain off. The airline may be
left connected during this operation.
3) Rotate back to normal position, connect the pump with
the piping and fix the socket head cap screws (pos. 174).
2.5. Residual risks
Even with proper application and observance of all points listed in this operating manual,
there is still an estimable and unexpected residual risk when using the pumps. It may leak,
fail due to wear, application-related causes or system-related circumstances.
2.6. Disposal after expiration of the expected lifetime
The metallic components like aluminium, stainless steel and carbon steel can be recycled.
Plastic parts are not recyclable and must be disposed of as residual waste. The pump must
be disposed of properly, according to local regulations. It should be noted that potentially
dangerous fluid residues may remain in the pump and can create a hazard to the operator
or the environment, therefore the pump has to thoroughly cleaned before disposal.
2.7. Actions in emergency
In the event of a leak during fluid transfer, the air supply have to be closed and the pressure
released. During spillage of an aggressive liquid, local and national safety rules must be
followed.

3. MAINTENANCE
IOM manual - Sanitary series 18
3. MAINTENANCE
3.1. When the pump is new or reassembled
If the pump is new or reassembled after maintenance it is important to retighten the
pump housing nuts (pos. 37) after approximately one week of operation. Make sure to
use the right torque see chapter 6.5 “Tightening torques”.
3.1.1. Performance test
When installation is new, a test run of the pump should be conducted. Gauge the capacity
at specific air pressure/flow. This information is useful for checking performance in the
future as wear takes place. You will be able to set schedules for maintenance of the pump
and to select spare parts to be kept on stock.
3.2. Routine inspection
Frequent observation of the pump operation is recommended to detect problems. Leaking
air or liquid from the pump and changes of performance, as well as abnormal noises, can
be indication of worn parts or pump malfunction (see chapter x.x ""Location of faults"").
We recommend to conduct a daily check and keep records of the following:
➢Any leakage from the pump
➢Tightness of all pump fasteners
➢Complete inspection in regular intervals has been done
In case any of the above is not fulfilled, do not start the pump and implement corrective

Scheduled maintenance is especially important to prevent spills or leakage due to
diaphragm failure.
3.3. Complete inspection
The intervals for a complete inspection depend upon the operation conditions of the pump.
The characteristics of the liquid, temperature, materials used in the pump and running time
decide how often a complete inspection is necessary.
Nevertheless, Tapflo recommend to inspect the pump at least once a year and change parts

for detailed KIT content.

3. MAINTENANCE
IOM manual - Sanitary series 19
3.4. Location of faults
PROBLEM
POSSIBLE FAULT
POSSIBLE SOLUTION
The pump does not run
The air pressure is to low
Increase air pressure via a filter-regulator
The air connection is blocked
Check / clean air supply connection
Muffler is blocked
Check / clean / replace muffler
Air valve is defective
Clean / replace complete air valve
Dirt in the pump chamber
Remove debris from the chambers
Diaphragm breakdown
Replace diaphragm
The suction is bad
Suction connection is not tight
Tighten the suction line
Suction connection is blocked
Clean suction line
Muffler is blocked
Check / clean / replace muffler
Valve balls are blocked or damaged
Check dimensions and shape of valve balls
Valve seats are worn
Pump starts with high pressure
Air in suction / discharge line
Dry suction against discharge pressure
Check dimensions and shape of valve seats
Start the pump slowly (see chapter 2.2)
Vent suction / discharge line
Wet the pump / start without discharge pressure
The pump runs irregular
Valve balls are blocked
Check dimensions and shape of valve balls
Sealing in centre block
Air valve is defective
Replace sealing
Clean / replace air valve
Diaphragm breakdown
Valve seats are worn
Icing on the muffler
Replace diaphragm
Check dimensions and shape of valve seats
Improve air quality (see chapters 1.7.1 and 2.2.2)
Bad flow/pressure
Pressure fall in air supply
Pressure losses on suction side
Air supply / air valve leaking
Increase air pressure via a filter-regulator
Check/change installation on suction side
Check / repair / replace air supply / air valve
Suction or air connection blocked
Check / clean air supply / suction connection
Muffler is blocked
Check / clean / replace muffler
Valve ball worn or broken
Valve seats are worn
Check dimensions and shape of valve balls
Check dimensions and shape of valve seats
Air in liquid
Seal suction line; check / refill container
Diaphragm breakdown
Icing on the muffler
Check / replace diaphragms
Improve air quality (see chapters 1.7.1 and 2.2.2)
Liquid leaks from the pump
Screws on the housing not properly
tightened
O-rings on manifolds damaged
Damaged diaphragm
Tension / stress form the installation
Check tightening torques of the screws
Replace O-rings
Check / replace diaphragms
Adjust installation, eliminate stress, when using a
dampener provide separate support for it (see
dampener IOM manual).
Liquid comes out of the
muffler
Diaphragm breakdown
Replace diaphragm
Diaphragm breakdown
Wrong selection of material
Too high pressure in the installation
Long periods of dry running
Too high pressure on suction side
Contact us for information on material selection
Use air treatment system for protection
When dry, run pump slowly (see chapter 2.2)
Make sure there is pressure balance between the air
and liquid side of the diaphragm

3. MAINTENANCE
IOM manual - Sanitary series 20
3.5. T30 Disassembly of the pump
The numbers put in brackets, refer to the part numbers in the spare part drawings and spare part
lists in chapter 5 “SPARE PARTS”.
3.5.1. Before the disassembly procedure
Be sure to drain all liquid from the pump. Cleanse or neutralize the pump thoroughly.
Disconnect the air supply and then the suction and discharge connections.
3.5.2. Disassembly procedure
Fig. 3.5.1
Unscrew and remove muffler [25].
Fig. 3.5.2
Unscrew and remove two tri-clamps [138] connecting
the outlet manifold [132] to the housings [11].
Fig. 3.5.3a
Take off the outlet manifold [132].
Fig. 3.5.3b
Remove the valve balls [23].