TapFlo TF50 Operation instructions

TF
Filter-press Diaphragm Pumps
Original Instruction
edition 2017 rev 1
Read this instruction manual carefully,
before you install and operate the pump
Pump models:
TF50
TF100
TF200
TF400
TF70 S
TF120 S
TF220 S
TF420 S
TF70 A/C
TF120 A/C
TF220 A/C
TF420 A/C

CONTENTS
IOM manual Tapflo TF series 1
0. GENERAL......................................................................................................................................... 5
0.1. Introduction................................................................................................................................ 5
0.2. Warning symbols ....................................................................................................................... 5
0.3. Qualification and training of personnel................................................................................... 5
1. INSTALLATION ............................................................................................................................... 6
1.1. Operation principle.................................................................................................................... 6
1.2. Receiving inspection.................................................................................................................. 6
1.3. Lifting and transportation......................................................................................................... 7
1.4. Storage........................................................................................................................................ 7
1.5. Foundation ................................................................................................................................. 7
1.6. Suction and discharge piping ................................................................................................... 7
1.6.1. Rotary connections ............................................................................................................ 8
1.6.2. Connection of suction pipe ............................................................................................... 8
1.6.3. Connection of discharge pipe ........................................................................................... 8
1.7. Health and safety ....................................................................................................................... 8
1.7.1. Protection ........................................................................................................................... 8
1.7.2. Explosion hazardous environments –ATEX..................................................................... 9
1.7.3. Air pressure......................................................................................................................... 9
1.7.4. Noise level ........................................................................................................................ 10
1.7.5. Temperature hazards....................................................................................................... 10
1.8. Air connection .......................................................................................................................... 11
1.8.1. Air treatment system ....................................................................................................... 11
1.8.2. Pressure ratio 2:1 ............................................................................................................. 11
1.9. Example of installation............................................................................................................ 11
1.10. Scope of supply .................................................................................................................... 12
2. OPERATION .................................................................................................................................. 13
2.1. Before starting the pump........................................................................................................ 13
2.2. Starting and operation ............................................................................................................ 13
2.2.1. Dry running ...................................................................................................................... 13
2.2.2. Optimization of the pump lifetime ................................................................................ 13
2.2.3. Booster operation conditions ......................................................................................... 14
2.3. Pump stopping......................................................................................................................... 14
3. MAINTENANCE ............................................................................................................................ 15
3.1. When the pump is new or reassembled................................................................................. 15

CONTENTS
IOM manual Tapflo TF series 2
3.1.1. Performance test.............................................................................................................. 15
3.2. Routine inspection ................................................................................................................... 15
3.3. Complete inspection ................................................................................................................ 15
3.4. Location of faults ..................................................................................................................... 16
3.5. TF50-TF400 –Disassembly of the pump (PE & PTFE) ........................................................... 17
3.5.1. Before the disassembly procedure ................................................................................. 17
3.5.2. Disassembly procedure.................................................................................................... 17
3.6. TF50-TF400 –assembly of the pump (PE & PTFE) ................................................................ 20
3.6.1. Test run ............................................................................................................................. 21
3.7. TF70 –TF420 –disassembly pf the pump (Stainless Steel) .................................................. 21
3.7.1. Before the disassembly procedure ................................................................................. 21
3.7.2. Disassembly procedure.................................................................................................... 21
3.8. TF70 –TF420 - assembly of the pump –Stainless Steel ....................................................... 23
3.8.1. Test run ............................................................................................................................. 24
3.9. TF70 –TF420 –disassembly pf the pump (A/C) .................................................................... 24
3.9.1. Before the disassembly procedure ................................................................................. 24
3.9.2. Disassembly procedure.................................................................................................... 24
3.10. TF70 –TF420 - assembly of the pump –A/C ..................................................................... 26
3.10.1. Test run ............................................................................................................................. 27
4. STANDARD AND OPTIONS ......................................................................................................... 28
4.1. Standard ................................................................................................................................... 28
4.2. SMC booster ............................................................................................................................. 28
4.3. Booster without manometers and regulator......................................................................... 28
4.4. Air treatment system ............................................................................................................... 29
4.5. Pump prepared for booster assembly.................................................................................... 29
4.6. Pump with reinforcement plates ............................................................................................ 29
4.7. Pump with aluminium centre body........................................................................................ 30
5. SPARE PARTS................................................................................................................................ 31
5.1. Plastic pumps ........................................................................................................................... 31
5.2. Plastic pumps –Additional / other spare parts list ............................................................... 31
5.3. Stainless steel pumps............................................................................................................... 31
5.4. Stainless steel pumps –Spare parts list ................................................................................. 31
5.5. Aluminium / cast iron pumps ................................................................................................. 32
5.6. Aluminium / cast iron pumps –Spare parts list .................................................................... 32
5.7. Stocking recommendation...................................................................................................... 32
5.8. How to order parts................................................................................................................... 33

CONTENTS
IOM manual Tapflo TF series 3
5.9. Pump code................................................................................................................................ 33
6. DATA ............................................................................................................................................. 34
6.1. Capacity curves......................................................................................................................... 34
6.2. Capacity changes...................................................................................................................... 35
6.3. Technical data .......................................................................................................................... 36
6.4. Dimensions ............................................................................................................................... 37
6.4.1. Plastic pumps ................................................................................................................... 37
6.4.2. Stainless steel pumps....................................................................................................... 38
6.4.3. Aluminium / cast iron pumps ......................................................................................... 39
6.5. Tightening torques .................................................................................................................. 40
6.6. Permitted loads on manifolds................................................................................................. 40
7. WARRANTY .................................................................................................................................. 42
7.1. Warranty form.......................................................................................................................... 42
7.2. Returning parts ........................................................................................................................ 43
7.3. Warranty ................................................................................................................................... 43

EC DECLARATION OF CONFORMITY 01/EC/TF/2017
Series:
TF(…)
Serial numbers:
2013 - … (from 1301-…)
Manufactured by:
Tapflo AB
Filaregatan 4
4434 Kungälv, Sweeden
This declaration of conformity is issued under the sole responsibility of the manufacturer.
Object of declaration: FILTER PRESS AIR OPERATED DIAPHRAGM PUMPS
The object of the declaration described above is in conformity with the relevant Union
harmonization legislation:
Directive 2006/42/EC of European Parliament and of the Council of 17 May 2006 on
machinery, amending Directive 95/16/EC;
Mr Michał Śmigiel is 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
Håkan Ekstrand
Managing director
Tapflo AB, 02.03.2017r

0. GENERAL
IOM manual Tapflo TF series 5
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 almost all
different chemicals used by the industry today.
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.
The Tapflo pump for filter press feeding is a very compact unit that can be mounted directly
to the filter press. The design and function allows the user a straightforward pressing of
slurries.
A pressure regulator is already mounted on the unit. The pumps are based on standard
metal and plastic Tapflo pumps. An external pressure booster doubles the delivery pressure.
For example, with available air pressure of 7 bar, the delivery pressure will be maximum 14
bar.
When installing, operating and maintaining of the pump unit you must strictly follow the
IOM manual. Otherwise injury or life hazard may occur.
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.

1. INSTALLATION
IOM manual Tapflo TF series 6
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 (right side) when being pulled back
from the housing.
Discharge
The other diaphragm simultaneously transmits the air pressure to the liquid in the second
chamber (left side) 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 Tapflo TF series 7
!
1.3. Lifting and transportation
Before handling the pump check the weight of the pump (see 6.3. 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 manifolds or hoses attached to the pump.
As an option pumps can be equipped with lifting eyebolts connected with the pump pinscrews.
1.4. Storage
If the equipment is to be stored prior to installation, place it in a clean location. The pump
should be stored in an ambient temperature of 15°C (59°F) to 25°C (77°F) and relative humidity
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
Plastic pumps are equipped with vibration absorbing rubber feet. The pumps will operate
properly without being fixed to a foundation. If fixation is needed for installation purposes,
make sure the foundation 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.
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 Tapflo TF series 8
1.6.1. Rotary connections
The suction and discharge connections can be rotated 180°. This simplifies the assembly and
installation of the pump. If you wish to rotate the connections, screw a threaded nipple into the
connection and rotate it. On the larger models TF200 and TF400 it will be easier if the housing
nuts are slightly released while turning the connections.
1.6.2. 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, the following is recommended:
1)
For satisfactory operation, use a 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 between the hose and the 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 emerge within
long piping.
1.6.3. Connection of discharge pipe
For this connection it is only recommended to have 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 16.
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 Tapflo TF series 9
1.7.2. Explosion hazardous environments –ATEX
The standard PE, PTFE and SS 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 TXF pumps are available for such
applications. All our aluminium and cast iron pumps are by standard ATEX approved.
Follow below instructions and local/national rules for safe use.
For use in explosion hazardous environment a special booster is required (see chapter 4.2).
Booster ATEX classification is II 3 GD c T6. Please contact us for more details. As a general rule
it is recommended to install the booster outside of the hazardous area.
ATEX (directive 94/9/EC) classification of Tapflo TX pumps:
ATEX II 2 GD IIB cT4
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: IIB –such as ethylene;
Type of protection: c–constructional safety;
Temperature class: T4 –in the event of a malfunction, the maximum temperature of a
surface that may be exposed to gas T4 = 135 °C.
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.
1.7.3. Air pressure
The maximum air feed pressure for Tapflo TF pumps is 8 bar for sizes TF50, TF70, TF100 and
TF120, 7 bar for TF220 and 6 bar for sizes TF200, TF420 and TF400. This is the air pressure that
is supplied to the pressure booster. As a result the pump will be supplied with 16 bar, 14 bar
and 12 bar respectively.
To withstand this high pressure the pumps, as a standard, are equipped with a special, hybrid
air valve which is equipped with a PET piston and in case of plastic pumps, two stainless steel
reinforcement plates.
Higher air pressure 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. INSTALLATION
IOM manual Tapflo TF series 10
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 5 “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.
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.
Below 0°C (32°F) plastic materials become more fragile what can cause accelerated 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. INSTALLATION
IOM manual Tapflo TF series 11
1.8. Air connection
Screw the air hose into the air intake on the booster. For best efficiency, use the same hose
diameter as the internal diameter of the connection on the air intake.
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), the air may be lubricated with water. 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. If a compressor used
to generate compressed air is not fitted with an air dryer it is recommended to use a water
separator to remove the extent of water from the prepared air.
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); It is recommended to install the needle valve between the booster and pump
4) Filter.
These components are included in Tapflo’s Air treatment system which can be ordered from
us.
1.8.2. Pressure ratio 2:1
The pressure booster has the function to transmit the primary pressure (from air supply) to an
output pressure of up to twice as much. The pressure ratio between the input and output side
is, by default, set to 2:1.
1.9. Example of installation
NOTE! Do not exceed 0,7 bar suction pressure! Higher pressure may cause premature
diaphragm failure and irregular pump operation.

1. INSTALLATION
IOM manual Tapflo TF series 12
1.10. Scope of supply
As a standard the pump is supplied with the following items:
1. Complete pressure booster:
a. Quick air connection for air supply
b. Muffler
c. Pressure regulator
d. Two manometers –input and output pressure
2. Reinforcement plates (plastic pumps only)
3. Mounting plate with screws
4. Air connection between the pump and the booster
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 Tapflo TF series 13
2. OPERATION
2.1. Before starting the pump
Make sure the pump is installed according to the installation instruction (chapter 1).
Filling of the pump with liquid before start is not necessary.
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 5.5 “Tightening torques”). After approximately one week of operation, the
torque should be checked again. 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. Remember that suction capacity is higher
when pump runs slowly.
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. What is more, 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. As a general rule, we recommend to run at half of
the maximum capacity of the pump. For instance, a TF100 pump should run continuously
at maximum 50 l/min.
As stated in chapter 1.8.1 Tapflo recommends to use an appropriate air treatment
system in order to extend the pump’s lifetime.
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 may
appear causing it to shrink and eventually it can shoot out of its socket.
If the ambient air is humid, icing can occur outside of the muffler. In such case it is
recommended to use a longer exhaust of the compressed air (ca. 500 mm / 19,7’’).

2. OPERATION
IOM manual Tapflo TF series 14
If there is possibility of freezing at the air exhaust, it is good to pre-heat the air before it
reaches the air intake in order to raise the dew point of the air.
NOTE! Make sure that the air temperature does not exceed 50°C (122°F).
If icing / freezing is still a problem with the standard muffler, we recommend using our
heavy duty metal muffler. Contact us for more information.
2.2.3. Booster operation conditions
In principal the booster is designed for intermittent operation. It cannot be used as a
replacement for a compressor. During continuous work the lifetime is significantly
decreased due to overheating of the device and increased wear of the seals.
In order to obtain optimal lifetime it is advised that the discharging frequency be
not higher than 0,33 Hz (once pressure discharge per 3 seconds). The exact rest
periods cannot be determined generally because they depend on the discharge
frequency and heat removal conditions.
It is recommended that for every hour of booster operation at least a 5 minute rest
period is foreseen. If these conditions are difficult or impossible to fulfil, it is
recommended to use an air reservoir in the installation.
To increase the booster lifetime a bypass installation can be used in order to relieve
the booster at lower pressures when the filter press is not yet filled.
Maximum temperature of air supplier to the booster cannot be higher than 25 ºC.
Recommend air quality is 6:4:4 according to PN-ISO8573-1:2010.
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.

3. MAINTENANCE
IOM manual Tapflo TF series 15
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 a few days of operation.
Make sure to use the right torque –see chapter 5.5 “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. A change
in sound of the running pump can be an indication of wearing parts (see chapter 3.4
"Location of faults" below).
Leaking liquid from the pump and changes of performance may also be detected. Routine
inspections should be conducted frequently.
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.
If a problem has occurred, or if the pump is in need of a complete inspection, refer to
chapters 3.4 "Location of faults" and 3.5, 3.7 "Dismantling of the pump". You are of course
warmly welcome to consult us for further help.
Parts that are subject to wear should be kept in stock, see our recommendations in chapter
4.7 “Stocking recommendation”.

3. MAINTENANCE
IOM manual Tapflo TF series 16
3.4. Location of faults
PROBLEM
POSSIBLE ISSUE
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
Booster issues
Too small output pressure
Too small flow
Booster does not start
Check input pressure; Rotate knob counter-
clockwise; Too high air consumption
Check if connections are of correct size
Booster malfunction / valve in mid-position –
contact us for more information

3. MAINTENANCE
IOM manual Tapflo TF series 17
3.5. TF50-TF400 –Disassembly of the pump (PE & PTFE)
The numbers put in brackets, refer to the part numbers in the spare part drawings and spare
part lists in chapter 4“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
Disconnect the air hose from the booster and from the
pump.
Fig. 3.5.2
Unscrew and remove the booster [99] from the
mounting plate [990].
Fig. 3.5.3
Unscrew four nuts [37] holding the mounting plate
[990] and remove it from the pump.
Fig. 3.5.4
Unscrew the remaining nuts [37] and carefully remove
the pin screws [147].

3. MAINTENANCE
IOM manual Tapflo TF series 18
Fig. 3.5.5
Lay down the pump on one side and lift one of the
housings [11].
Fig. 3.5.6
Lift the loose manifolds [13] and centre block [12] from
the second housing [11].
Fig. 3.5.7
To remove the spacer sleeve [19], use a plastic rod and
a hammer to knock it out.
NOTE! Be careful not to deform the spacer sleeve.
Fig. 3.5.8
Insert our special tool or pin screw [14] into the orifice
in the spacer sleeve [19], rotate it.
Fig. 3.5.9
Pull out the spacer sleeve [19].
Fig. 3.5.10
Pull out the lower sleeve [212], valve seat [222] and
O-ring [43].

3. MAINTENANCE
IOM manual Tapflo TF series 19
Fig. 3.5.11
Pull out the upper sleeve [202] alongside with the
valve seat [222], O-ring [43] and the blocking pin
[2021].
Fig. 3.5.12
Unscrew the diaphragm [15] from one side of the
pump.
Fig. 3.5.13
Take out the second diaphragm [15] along with the
shaft [16].
Fig. 3.5.14 TF/TXF50, TF100
Using pliers remove both circlips [27] from the centre
block [12].
Attention! While doing this, cover yourself with your
other hand, as the circlip easily flips away
Fig. 3.5.15 TF/TXF50, TF100
Press out the air valve [61] by means of a pressing
device. Be careful not to damage the brass edges of
the air valve.
Fig. 3.5.16 TXF100, TF/TXF200, TF/TXF400
Unscrew plate screws [2711] from both sides of the
centre body [12] and take out the left and right plate
[271].