KNF NPK 09 User manual

KNF 121576-121579 11/20
Translation of original Operating and Installation Instructions, english Keep for future use!
Swing Piston Compressors and Vacuum Pumps
NPK 09 NPK 09 DC
Operating and
Installation
Instructions
Read and observe these Oper-
ating and Installation Instruc-
tions!
NPK 09.1 NPK 09.2 NPK 09.1.2
List of Contents Page
1. About this document................................................................. 2
2. Use........................................................................................... 3
3. Safety ....................................................................................... 4
4. Technical Data.......................................................................... 6
5. Design and function.................................................................. 8
6. Installation and connection..................................................... 10
7. Operation................................................................................ 13
8. Servicing................................................................................. 14
9. Cleaning ................................................................................. 18
10. Troubleshooting...................................................................... 19
11. Spare parts and accessories.................................................. 21
12. Returns................................................................................... 22
KNF Neuberger GmbH
Alter Weg 3
D-79112 Freiburg
Germany
Phone [phone] / 5909-0
Fax [phone] / 5909-99
E-Mail: [email protected]
www.knf.de

About this document Swing Piston Pumps NPK 09
2 Translation of original Operating Instructions, English, KNF 121576-121579 11/20
1. About this document
1.1. Using the Operating and Installation Instruc-
tions
The Operating and Installation Instructions are part of the pump.
➔Pass on the Operating and Installation Instructions to the next
owner.
Customer-specific project pumps (pump models which begin with
"PJ" or "PM") may differ from the Operating and Installation In-
structions.
➔For project pumps, also observe the agreed upon specifica-
tions.
1.2. Symbols and markings
Warning
WARNING
A danger warning is located here.
Possible consequences of a failure to observe the
warning are specified here. The signal word, e.g.
Warning, indicates the danger level.
➔Measures for avoiding the danger and its conse-
quences are specified here.
Danger levels
Signal word
Meaning
Consequences if not observed
DANGER
warns of immedia-
te danger
Death or serious injuries
and/or serious damage are the
consequence.
WARNING
warns of possible
danger
Death or serious injuries
and/or serious damage are
possible.
CAUTION
warns of a possibly
dangerous situa-
tion
Minor injuries or damage are
possible.
Tab. 1
Other information and symbols
➔An activity to be carried out (a step) is specified here.
1. The first step of an activity to be carried out is specified here.
Additional, consecutively numbered steps follow.
This symbol refers to important information.
Project pumps

Swing Piston Pumps NPK 09 Use
Translation of original Operating Instructions, English, KNF 121576-121579 11/20 3
2. Use
2.1. Proper use
The pumps are exclusively intended for transferring gases.
Owner's responsibility
Only install and operate the pumps under the operating parameters
and conditions described in Chapter 4, Technical data.
Only complete pumps may be taken into service.
Make sure that the installation location is dry and the pump is
protected against rain, splash, hose and drip water.
Before using a medium, check whether the medium can be trans-
ferred danger-free in the specific application case.
Before using a medium, check the compatibility of the materials of
the pump head, pump housing, diaphragms, and valves with the
medium.
Only transfer gases which remain stable under the pressures and
temperatures occurring in the pump.
2.2. Improper use
The pumps may not be operated in an explosive atmosphere.
The pumps are not suitable for transferring dusts.
The pumps are not suitable for transferring vapors and liquids.
The pumps must not be used to create vacuum and overpressure
simultaneously.
An overpressure must not be applied to the suction side of the
pump.
Operating parameters and
conditions
Requirements for
transferred medium

Safety Swing Piston Pumps NPK 09
4 Translation of original Operating Instructions, English, KNF 121576-121579 11/20
3. Safety
Note the safety precautions in Chapters 6. Installation and
connection, and 7. Operation.
The pumps are built according to the generally recognized rules of
technology and in accordance with the occupational safety and
accident prevention regulations. Nevertheless, dangers can result
during their use which lead to injuries to the user or others, or to
damage to the pump or other property.
Only use the pumps when they are in a good technical and proper
working order, in accordance with their intended use, observing the
safety advice within the Operating and Installation Instructions, at
all times.
Make sure that only trained and instructed personnel or specially
trained personnel work on the pumps. This especially applies to
assembly, connection and servicing work.
Make sure that the personnel has read and understood the Operat-
ing and Installation Instructions, and in particular the "Safety"
chapter.
Observe the accident prevention and safety regulations when
performing any work on the pump and during operation.
When transferring dangerous media, observe the safety regula-
tions when handling these media.
Be aware that the pumps are not designed to be explosion-proof.
Make sure the temperature of the medium is always sufficiently
below the ignition temperature of the medium, to avoid ignition or
explosion. This also applies for unusual operational situations.
Note that the temperature of the medium increases when the pump
compresses the medium.
Hence, make sure the temperature of the medium is sufficiently
below the ignition temperature of the medium, even when it is
compressed to the maximum permissible operating pressure of the
pump.
If necessary, consider any external sources of energy, such as
radiation, that may add heat to the medium.
In case of doubt, consult the KNF customer service.
Store all replacement parts in a protected manner and dispose of
them properly in accordance with the applicable environmental
protection regulations. Observe the respective national and inter-
national regulations. This especially applies to parts contaminated
with toxic substances.
For the purposes of the Machinery Directive 2006/42/EC, pumps
are “partly completed machinery,” and are therefore to be regarded
as not ready for use. Partly completed machinery may not be
commissioned until such time as it has been determined that the
machine in which the partly completed machinery is to be
assembled is in conformity with the provisions of the Machinery
Directive 2006/42/EC. The following essential requirements of
Personnel
Working in a safety-
conscious manner
Handling dangerous media
Handling combustible media
Environmental protection
EC Directives / Standards

Swing Piston Pumps NPK 09 Safety
Translation of original Operating Instructions, English, KNF 121576-121579 11/20 5
Annex I of Directive 2006/42/EC (general principles) are applied
and observed:
−General Principles No. 1
−No. 1.1.2. / 1.1.3. / 1.3.1. / 1.3.3. / 1.3.4. / 1.4.1. / 1.5.1.* /
1.5.2.* / 1.5.8. / 1.5.9. / 1.7.4. / 1.7.4.1. / 1.7.4.3.
(* only for pumps with AC motor)
As these partly completed machinery are OEM-models the power
supplies and the equipment for disconnecting and switching-off the
partly completed machinery respectively have to be considered
when mounting as well as over-current and overload protective
gear.
In addition a protection against mechanical parts in motion and hot
parts, if existing, has to be provided when mounting.
The pumps conform to the Directive 2011/65/EU.
The following harmonized standards have been used:
NPK 09 DC
NPK 09 NPK 09.1
NPK 09.2 NPK 09.1.2
DIN EN 55014-1/2
DIN EN 55014-1/2
DIN EN 60034-1
DIN EN 61000-3-2/3
DIN EN 50581
DIN EN 50581
DIN EN 61000-6-1/2
DIN EN 60335-1
Tab. 2
Only have repairs to the pumps carried out by the KNF Customer
Service responsible.
Customer service and
repairs

Technical Data Swing Piston Pumps NPK 09
6 Translation of original Operating Instructions, English, KNF 121576-121579 11/20
4. Technical Data
Pump materials
Assembly
Material
Ribbed head; intermediate plate
Aluminium
Housing
Aluminium
Valve plate
1.4310
Gasket
NBR compound
O-ring
FPM
Diaphragm
PTFE compound
Tab. 3
Pneumatic values
Pump type
Delivery rate at
atm. pressure
[l/min]*
Max. permissible
operating pressure
[bar g]
Ultimate vacuum
[mbar abs.]
NPK 09
12
7
100
NPK 09 DC
15
NPK 09.1
24
-
NPK 09.2
7
-
NPK 09.1.2
100
Tab. 4 * Liters in standard state (1,013 mbar)
Pneumatic connections
Pump type
Suction side
Pressure side
NPK 09
Thread size G1/8“
NPK 09 DC
Thread size G1/8“
NPK 09.1
For hose ID6
Thread size G1/8“G1/8“
NPK 09.2
Thread size G1/8“
For hose ID6
NPK 09.1.2
For hose ID6
Tab. 5
Electrical data
Parameter
Value
Electrical data
See type plate
Protection class
IP00
Tab. 6
The ac-motors of the pumps are fitted as standard with a thermal-
switch to protect against overloading.
Thermal-switch

Swing Piston Pumps NPK 09 Technical Data
Translation of original Operating Instructions, English, KNF 121576-121579 11/20 7
Dimensions
Pump type
Dimensions [L x W x H]
NPK 09
approx. 132.5 x 81 x 107
NPK 09 DC
approx. 129 x 65 x 107
NPK 09.1
approx. 191 x 115 x130
NPK 09.2
NPK 09.1.2
Tab. 7
Weight
Pump type
Weight [kg]
NPK 09
approx. 1.8
NPK 09 DC
approx. 1.6
NPK 09.1
approx. 2.2
NPK 09.2
NPK 09.1.2
approx. 2.4
Tab. 8
Other parameters
Parameter
Values
Permissible
ambient temperature
+ 5 °C to + 40 °C
Permissible media temperature
+ 5 °C to + 40 °C
Maximum permissible ambient
relative humidity
80 % for temperatures up to
31 °C, decreasing linearly to
50 % at 40 °C
Max. altitude of site
[m above sea level]
2000
Tab. 9

Design and function Swing Piston Pumps NPK 09
8 Translation of original Operating Instructions, English, KNF 121576-121579 11/20
5. Design and function
Design NPK 09 DC
1Outlet
2Pump head
3Inlet
4Motor
Fig. 1: Swing Piston Pump NPK 09 DC
Design NPK 09 AC
1Outlet
2Pump head
3Inlet
4Pneumatic
head connection
5Motor
6Pneumatic
head connection
7Pump head
Fig. 2: Swing Piston Pump NPK 09 AC

Swing Piston Pumps NPK 09 Design and function
Translation of original Operating Instructions, English, KNF 121576-121579 11/20 9
Fig. 3: Pneumatic connection of two-headed pumps
How Swing Piston Pumps work
1Inlet valve
2Outlet valve
3Working chamber
4 Retainer plate
5Piston seal
6 Eccentric
7Connecting rod
8Compressor housing
Fig. 4: How Swing Piston Pumps work
Swing Piston Pumps transfer, compress and evacuate air.
The swing piston, consisting of retainer plate (4) and piston seal
(5), is moved up and down by the eccentric (6) and the connecting
rod (7). In the downward stroke the swing piston aspirates the
medium to be transferred via the inlet valve (1). In the upward
stroke, the swing piston presses the medium out of the pump head
via the outlet valve (2). The swing piston is sealed off from the
compressor housing by a piston seal (5) and operates oil-free.

Installation and connection Swing Piston Pumps NPK 09
10 Translation of original Operating Instructions, English, KNF 121576-121579 11/20
6. Installation and connection
Only install and operate the pumps under the operating parameters
and conditions described in Chapter 4, Technical data.
Observe the safety precautions (see Chapter 3).
6.1. Installation of the pump
➔Before installation, store the pump at the installation location to
bring it up to ambient temperature.
➔See the data sheet for the mounting dimensions.
➔When setting up or installing the pump, make sure that the fan
can draw in an adequate amount of cooling air.
➔When setting up or installing the pump, make sure that an
accidental finger contact with the fan is impossible
➔Make sure that the installation location is dry and the pump is
protected against rain, splash, hose and drip water.
➔Install the pump at the highest point in the system to prevent
condensate from collecting in the pump head.
➔Choose a safe location (flat surface) for the pump.
➔Protect the pump from dust.
➔Protect the pump from vibrations and jolts.
6.2. Electrical connection
For pumps with AC motor:
DANGER
Extreme danger from electrical shock
➔Only have the pump connected by an authorized
specialist.
➔Only have the pump connected when the power
supply is disconnected.
For pumps with DC motor:
➔Only have the pump connected by an authorized specialist.
➔Only have the pump connected when the power supply is
disconnected.
➔When connecting the device to a power source, the relevant
standards, directives, regulations, and technical standards
must be observed.
➔In the electrical installation, arrangements (complying with EN
60335-1) must be made for disconnecting the pump motor
from the electrical supply.
➔The motors of the pump must be protected according to EN
60204-1 (protection against excess current, or overloading).
➔For operating current see type plate or data sheet.
Mounting dimensions
Cooling air supply
Installation location

Swing Piston Pumps NPK 09 Installation and connection
Translation of original Operating Instructions, English, KNF 121576-121579 11/20 11
➔It is recommended that an additional “Emergency Stop” switch
is installed.
➔The pump must be installed so that contact with live parts is
impossible.
Connecting pump
1. Compare the supply data with the data on the motor-plate. For
operating current see type plate.
The voltage must not vary by more than + 10% and - 10% from
that shown on the type-plate.
The earth (ground) wire must be connected to the motor (not
necessary on dc motors up to 24V).
2. Connect the earth (ground) wire to the motor (not necessary on
dc motors up to 24V).
3. For NPK 09 AC:
Connect the mains cables to the connections L1 and N of the
pump motor.
4. For NPK 09 DC:
Connect the positive and negative pole.
Note the proper polarity (see marking on the motor).
Correct connection:
+ red cable
- black cable
EMC-compatible Installation (for NPK 09 DC)
The Tests:
- Magnetic field with energy-technical frequency
- Electromagnetic HF field, amplitude-modulated
- Electromagnetic HF field, pulse-modulated
- Discharging of static electricity
- High frequency, asymmetric
- Fast transients
were not carried out, cause the products do not contain electronic
modules, which can be affected by these tests.
The Surge-test can only be passed with additional means, or is not
mandatory, if: From EN61000-6-1 technical norm for EMC protec-
tion, part 1,10 test demands for EMC protection, table 3, EMC
protection, D.C.- power in- and outputs. Remark 3: (quotation) Not
to be used with input connections which are foreseen for a connec-
tion with a battery or a rechargeable battery which has to be re-
moved or disconnected from the device for the recharge.
Devices with a D.C. power input which are foreseen to be operated
with an A.C. / D.C. converter have to be tested at an A.C. power
input of an A.C. / D.C. converter fixed by the manufacturer. In case

Installation and connection Swing Piston Pumps NPK 09
12 Translation of original Operating Instructions, English, KNF 121576-121579 11/20
the converter was not fixed they have to be tested at an A.C.
power input of a typical (usual) A.C. / D.C. converter.
The test is applicable for D C power inputs which are foreseen for
a permanent connection to cables which are longer than 10 m.
6.3. Pneumatic connection
➔Only connect components to the pump which are designed for
the pneumatic data of the pump (see Chapter 4, Technical da-
ta).
➔If the pump is used as a vacuum pump, safely discharge the
pump exhaust at the pump´s pneumatic outlet.
Connecting pump
A marking on the pump head shows the direction of flow.
1. Remove the protective plugs from the hose connectors.
2. If the accessories silencer, filter, and hose connector are
present, screw them onto the corresponding hose connection
threads.
The filter or silencer is to be mounted on the suction side or
pressure side of the pump head. With multiple-head pumps,
this relates to the first pump head or last pump head.
3. Connect the suction line and pressure line.
4. Lay the suction and pressure line at a downward angle to
prevent condensate from running into the pump.
Connected
components
Pump exhaust

Swing Piston Pumps NPK 09 Operation
Translation of original Operating Instructions, English, KNF 121576-121579 11/20 13
7. Operation
Only operate the pumps under the operating parameters and
conditions described in Chapter 4, Technical data.
Make sure the pumps are used properly (see Chapter 2.1).
Make sure the pumps are not used improperly (see Chapter 2.2).
Observe the safety precautions (see Chapter 3).
WARNUNG
Hazard of the pump head bursting due to excessive
pressure increase
➔Do not exceed max. permissible operating
pressure (see Chapter 4, Technical data).
➔Monitor pressure during operation.
➔If the pressure exceeds the maximum permissi-
ble operating pressure, immediately switch off
pump and eliminate fault (see Chapter 8. Trou-
bleshooting).
➔Only throttle or regulate the air or gas quantity in
the suction line to prevent the maximum permis-
sible operating pressure from being exceeded.
➔If the air or gas quantity in the pressure line is
throttled or regulated, make sure that the maxi-
mum permissible operating pressure is not ex-
ceeded.
Excessive pressure (with all of the related hazards) can be
prevented by placing a bypass line with a pressure-relief valve
between the pressure and suctions sides of the pump. For
further information, contact our technical adviser (see last page
for telephone number).
➔With the pump at a standstill, open pressure vacuum and
suction lines to normal atmospheric pressure.
The pump may not start up against pressure or vacuum during
switch-on. This also applies in operation following a brief power
failure.
➔Make sure that normal atmospheric pressure is present in the
lines during switch-on.
➔Regulary inspect the pump for external damage or leaks.
Piston seal and valve plates are the only parts subject to wear.
Wear is usually indicated by a drastic reduction in the pneu-
matic performance. When replacing parts proceed as de-
scribed in Chapter 8.
➔Change the filter (accessories) if it is dirty.
Pump standstill
Switching pump on
Inspection

Servicing Swing Piston Pumps NPK 09
14 Translation of original Operating Instructions, English, KNF 121576-121579 11/20
8. Servicing
Before working on the pump, isolate the power supply secure-
ly, then check that the lines are not live.
The piston seal, and to a lesser extent the valve plates are the only
parts of the pump subject to wear. They are simple to change.
When changing the piston seal, check the valve plates for damage
(tongues bent, corrosion).
Fig. 5:
Pump element (single head types)
Fig. 6:
Pump element (twin head types)
Fig. 7:
Pump element (all types)
Fig. 8:
Pump head (all types)
Specifiaction
Pos. Description
1 Housing
2 Intermediate plate
3 Ribbed head
4 Screw
5 Connection
(only twin head
models)
6 Gasket
7 Valve Plate
8 Valve Plate
9 O-Ring
10 Cylinder
11 Retainer Plate
12 Support
13 Piston seal
14 Screw
15 Washer(s)
16 Connecting rod
17 Counter weight
18 Cover
MMark
KCompression symbol

Swing Piston Pumps NPK 09 Servicing
Translation of original Operating Instructions, English, KNF 121576-121579 11/20 15
The position numbers in the following text refer to figs. 5 to 8.
8.1. Changing the piston seal
Spare part*
Quantity
Piston seal
1 (twin head pumps: 2)
Countersunk flat head screw (14)
2 (twin head pumps: 2)
Tab. 10 * According to Spare parts list, section 11
Tools/Material
Screwdriver TX20
Screwdriver (blade width 5,5 mm)
Phillips screwdriver no. 1
Felt-tip pen
Tab. 11
In the case of twin head pumps both piston seals should always be
changed at the same time.
Dismantling
1. In the case of twin head models the connecting pipework
between the heads must first be removed.
2. Make a mark (M) on the ribbed head (3), intermediate plate (2),
and housing (1) with a felt-tip pen (see M in figures 5 and 6).
This helps avoid incorrect assembly later.
3. Unscrew the 4 screws (4) and take off the ribbed head (3).
4. Remove gasket (6), valve plate (7), intermediate plate (2) and
valve plate (8) from housing (1).
5. Only for the pump model NPK09 DC: Take off the cover (18)
after removing the 4 screws securing it.
For this pump type applies: Where reference is made to turning
or holding the cooling fan, the necessary operations must be
carried out by turning or holding the counter-weight (17).
6. Turn the fan to bring the retainer plate (11) to top dead centre.
7. Pull the cylinder (10) upwards to remove it.
8. Hold the fan, loosen the retainer plate screw (14) and remove
screw, retainer plate, support (12) and washer(s) (16).
9. Remove the piston seal (13) from the retainer plate.
10. Check that all parts are free from dirt and clean them if neces-
sary (see section 9.Cleaning).
11. Check the valve plates for damage (tongues bent, corrosion); if
necessary use new ones when reassembling.
Parts required
Tools required

Servicing Swing Piston Pumps NPK 09
16 Translation of original Operating Instructions, English, KNF 121576-121579 11/20
Assembly
1. Hold the connecting rod (16) vertical, and replace the cylinder
(10) on the pump housing (1).
2. Re-assemble the "piston assembly":
▪Lay the new piston seal (13) on the retainer plate (11) with
the sealing lip towards the free surface of the retainer
plate.
▪Lay the support (12) on the retainer plate/piston seal as-
sembly.
▪Push the new countersunk flat head screw (14) through
the assembly, and fit the same number of washers as pre-
viously used.
3. Insert the piston assembly (retainer plate, support, piston seal
and washer(s) with their screw) into the cylinder from above,
on to the connecting rod.
The piston seal must not be distorted during assembly. It must
make contact with the cylinder all round its circumference.
4. Fasten the "piston assembly" by tightening the screw (14).
5. Reassemble the "head assembly": stack the following parts on
top of each other in the order given - ribbed head (3), gasket
(6), valve plate (7), intermediate plate (2), and valve plate (8).
Fig. 8 shows the correct orientation of the parts, particularly the
valve plates, in relation to the compression symbol on the head
plate. Both valve plates are identical, and they can be fitted ei-
ther way up. The intermediate plate can also be fitted either
way up.
6. Place the "head assembly" on the pump housing (1) - as a
guide to orientation see fig. 5 (single head models) or fig. 6
(twin head models). Reference point is the compression sym-
bol (indicated with a Kin the diagrams), or the mark (M).
7. Tighten the screws (4) at first lightly, then firmly by hand, in a
diagonal pattern (max. tightening torque 1.5 Nm).
8. Rotate the fan by hand to check that pump turns easily.
9. Pump model NPK 09 DC only: refit cover (18) to the housing.
For twin head pumps, repeat the operations described for the
second head, and replace the connections between the two heads.
If, after changing the piston seal, the specified vacuum is not
reached, check the following:
▪pneumatic connections for tightness
▪for twin head models that the head connections are gas-
tight
▪whether the washer(s) under the support has/have been
assembled.
If, after changing the piston seal, the pump produces no flow,
check the position and orientation of gasket (6), valve plate (7),
intermediate plate (2) and valve plate (8). See fig. 5,6 and 8.

Swing Piston Pumps NPK 09 Servicing
Translation of original Operating Instructions, English, KNF 121576-121579 11/20 17
8.2. Changing the valve plates
Spare part*
Quantity
Valve plates
2 (twin head pumps: 4)
Tab. 12 * According to Spare parts list, section 11
Tools/Material
Screwdriver TX20
Felt-tip pen
Tab. 13
In the case of twin head pumps, both valve plates must always be
changed at the same time. The text below describes the operations
necessary for one head.
To change the valve plates, the following operations of Section 8.1
Changing the piston seal must be carried out:
Disassembly
1 to 4, 10 and 11.
Assembly
5 to 8 using new valve plates (2 for each head).
For twin head pumps, repeat the operations described for the
second head, and replace the connections between the two heads.
If, after changing the valve plates, the specified vacuum is not
reached, check the following:
▪pneumatic connections for tightness
▪for twin head models that the head connections are gas-
tight
If, after changing the valve plates, the pump produces no flow:
▪check the position and orientation of gasket (6), valve plate
(7), intermediate plate (2) and valve plate (8). See fig. 5, 6
and 8.
If you have any questions about servicing call our technical adviser
(see last page for contact telephone number).
Parts required
Tools required

Cleaning Swing Piston Pumps NPK 09
18 Translation of original Operating Instructions, English, KNF 121576-121579 11/20
9. Cleaning
When changing valve plates and diaphragm, inspect all parts for
dirt before assembling the pump head, and clean them if neces-
sary.
As far as possible, clean the parts with a dry cloth. Solvents should
not be used as they can attack the plastics, and synthetic rubber
parts. If a compressed air line is available, blow the parts out with
it.

Swing Piston Pumps NPK 09 Troubleshooting
Translation of original Operating Instructions, English, KNF 121576-121579 11/20 19
10. Troubleshooting
For pumps with AC motor:
DANGER
Extreme danger from electrical shock!
➔Disconnect the pump power supply before working
on the pump.
➔Make sure the pump is de-energized and secure.
For pumps with DC motor:
➔Disconnect the pump power supply before working on the
pump.
➔Make sure the pump is de-energized and secure.
Check the pump (see Tab. 14 and 15).
Pump does not transfer
Cause
Fault remedy
Thermal switch has operated
following to over-heating.
➔Disconnect pump from mains.
➔Allow pump to cool.
➔Identify and eliminate cause of overheating.
Connections or lines blocked.
➔Check connections and lines.
➔Remove blockage.
External valve is closed or filter
is clogged.
➔Check external valves and filters.
Condensate has collected in
pump head.
➔Install pump at highest point in system.
Piston seal or valve plates are
worn.
➔Replace piston seal and valve plates (see Chapter 8)
Tab. 14

Troubleshooting Swing Piston Pumps NPK 09
20 Translation of original Operating Instructions, English, KNF 121576-121579 11/20
Flow rate, pressure or vacuum too low
The pump does not achieve the output specified in the Technical data or the data sheet.
Cause
Fault remedy
Condensate has collected in
pump head.
➔Install pump at highest point in system.
There is gauge pressure on
pressure side and at the same
time vacuum or a pressure
above atmospheric pressure on
suction side.
➔Change the pressure conditions.
Pneumatic lines or connection
parts have an insufficient cross
section.
➔Disconnect pump from system to determine output values.
➔Eliminate throttling (e.g. valve) if necessary.
➔Use lines or connection parts with larger cross section if
necessary.
Leaks occur on connections,
lines or pump head.
➔Eliminate leaks.
Connections or lines completely
or partially jammed.
➔Check connections and lines.
➔Remove the jamming parts and particles.
Head parts are soiled.
➔Clean head components.
Piston seal or valve plates are
worn.
➔Replace piston seal and valve plates (see Chapter 8)
Tab. 15
Fault cannot be rectified
If you are unable to determine any of the specified causes, send
the pump to KNF Customer Service (see last page for the ad-
dress).
1. Flush the pump to free the pump head of dangerous or ag-
gressive gases.
2. Remove the pump
3. Clean the pump
4. Send the pump, together with completed Health and Safety
Clearance and Decontamination Form to KNF stating the na-
ture of the transferred medium.