SKF PSG Series User manual

for oil, grease, and fluid grease, for use in SKF
ProFlex, MultiFlex, and circulating oil centralized lubrication
systems
Modular Feeders of Product Series PSG
EN
Version 01
Component Lifecycle Manual (CLM)
Operating instructions acc. to EC Dir. 94/9/EC (ATEX)

2
EN

3
Masthead EN
3
Masthead
These assembly instructions pursuant to
EC Machinery Directive 2006/42/EC are an
integral part of the product described here
and must be kept for future use.
Warranty
The instructions do not contain any infor-
mation on the warranty. This can be found
in the General Conditions of Sales, which
are available at:
www.skf.com/lubrication.
Copyright / Integration of instructions ©
SKF Lubrication Systems Germany GmbH
All rights reserved.
These instructions are protected by copy-
right.
The use of the contents for the purpose of
integration into the documentation of the
machine manufacturer in whose product it
will be integrated is expressly allowed. This
also includes the preparation of training
documents for internal, non-commercial
purposes. Any other usage of any kind
without written permission of the rights
holder is prohibited and constitutes a viola-
tion of copyright.
Manufacturer and service address
If you have technical questions, please
contact:
SKF Lubrication Systems Germany GmbH
Berlin Plant
Motzener Strasse 35/37
12277 Berlin
Germany
Tel. [phone]
Fax [phone]
www.skf.com/lubrication
Hockenheim Plant
2. Industriestrasse 4
68766 Hockenheim
Germany
Tel. [phone]
Fax [phone]
www.skf.com/lubrication

4
Modular Feeders of Product Series PSG 1
Explanation of symbols and signs 7
1. Safety instructions 9
1.1 General safety instructions 9
1.2 General behavior when handling
the product 9
1.3 Qualified technical personnel 10
1.4 Electric shock hazard 10
1.5 System pressure or hydraulic
pressure hazard 10
1.6 Operation 11
1.7 Assembly / maintenance / malfunction
/ decommissioning / disposal 11
1.8 Intended use 12
1.9 Foreseeable misuse 12
1.10 Disclaimer of liability 13
1.11 Explosion protection in ATEX 13
1.12 Referenced documents 14
1.13 Residual risks 15
2. Lubricants 16
2.1 General information 16
2.2 Selection of lubricants 16
2.3 Approved lubricants 17
2.4 Lubricants and the environment 18
2.5 Lubricant hazards 18
3. Overview / functional description 19
3.1 Overview of progressive feeders 19
3.2 Information on volume data 20
3.3 Overview of a general progressive
system 21
3.3.1 Functional description of a general
progressive system 22
3.4 Functioning of a PSG progressive
feeder 23
3.5 Information on the design of a
PSG progressive feeder 24
4. Technical data 25
4.1 PSG1 technical data 25
4.2 PSG2 technical data 28
4.3 PSG3 technical data 30
5. Delivery, returns, and storage 33
5.1 Checking the delivery 33
5.2 Returns 33
5.3 Storage 33
5.3.1 Lubrication units 33
5.3.2 Electronic and electrical devices 33
5.3.3 General notes 33
6. Assembly 34
6.1 Installation information 34
6.2 Installing the PSG1 35
6.2.1 Minimum mounting dimensions/
clearance and tightening torques 35
PSG1 feeder series
6.2.2 PSG1 basic design 36
6.2.3 PSG1 with piston detector (P3) 37
6.2.4 PSG1 with visual cycle indicator (ZY) 38
6.2.5 PSG1 with visual cycle indicator,
housing, and proximity switch (ZS) 39
EN
Table of contents
Table of contents

5
PSG1 ATEX feeder series
6.3 PSG1 feeders for ATEX-compliant
applications 40
6.3.1 Information on PSG1 ATEX feeders 41
6.3.2 PSG1 ATEX basic design 43
6.3.3 PSG1 ATEX feeder with plunger rod
and inductive proximity switch 44
PSG2 feeder series
6.4 Installing the PSG2 46
6.4.1 Minimum mounting dimensions/
clearance and tightening torques 46
6.4.2 PSG2 basic design 47
6.4.3 PSG2 with piston detector (P3) 48
6.4.4 PSG2 with visual cycle indicator (ZY) 49
6.4.5 PSG2 with visual cycle indicator,
housing, and proximity switch (ZS) 50
6.4.6 PSG2 with gear-type flow indicator 51
6.4.7 PSG2 with flow limiter for oil
applications 52
6.4.8 PSG2 with flow controller for oil
applications 56
6.4.9 PSG2 with 4/2 directional solenoid
valve for oil applications 57
6.4.10 PSG2 with 2/2 directional solenoid
valve for oil applications 58
PSG2 ATEX feeder series
6.5 PSG2 feeders for ATEX-compliant
applications 59
6.5.1 Information on PSG2 ATEX feeders 60
6.5.2 PSG2 ATEX basic design 62
6.5.3 PSG2 ATEX feeder with
proximity switch 63
6.5.4 PSG2 ATEX feeder with 2/2 directional
solenoid valve and proximity switch 64
PSG3 feeder series
6.6 Installing the PSG3 66
6.6.1 Minimum mounting dimensions/
clearance and tightening torques 66
6.6.2 PSG3 basic design 67
6.6.3 PSG3 with piston detector (P3) 68
6.6.4 PSG3 with visual cycle indicator (ZY) 69
6.6.5 PSG3 with visual cycle indicator,
housing, and proximity switch (ZS) 70
6.6.6 PSG3 with gear-type flow indicator 71
6.6.7 PSG3 with flow limiter for oil
applications 72
6.6.8 PSG3 with flow controller for oil
applications 75
6.6.9 PSG3 with 4/2 directional
solenoid valve for oil applications 76
PSG3 ATEX feeder series
6.7 PSG3 feeders for ATEX-compliant
applications 77
6.7.1 Information on PSG3 ATEX feeders 78
6.7.2 PSG3 ATEX basic design 80
6.7.3 PSG3 ATEX feeder with plunger rod
and inductive proximity switch 81
6.8 Installing a PSG modular feeder 82
6.9 Lubrication line connection 83
6.9.1 Assembly 83
6.9.2 Lubrication line arrangement 84
6.10 Consolidation of outlets 85
6.11 Changing a PSG module 86
6.12 Converting the cycle indicator
(ZY) (PSG1/PSG2) 87
6.13 Converting the piston detector
(P3) (PSG1/PSG2) 88
6.14 Attachment of bridges (crossporting) 89
EN
Table of contents

6
6.15 Note on the rating plate 92
7. Commissioning 93
7.1 General information 93
7.2 Commissioning 93
7.2.1 Venting a grease progressive system 93
7.2.2 Venting an oil progressive system 95
8. Operation/decommissioning and disposal 96
8.1 Temporary shutdown 96
8.2 Recommissioning 96
8.3 Decommissioning and disposal 96
9. Maintenance 97
9.1 General information 97
10. Malfunctions, causes, and remedies 98
10.1 Prior to beginning troubleshooting 98
10.2 Feeder and system malfunctions 99
11. Spare parts 102
12. Accessories 111
EN Table of contents

7
EN
Possible symbols
Meaning
Note
Electrical component hazard, elec-
tric shock hazard
Slipping hazard
Hazard from hot components
Hazard from hot surface
Risk of being drawn into machinery
Crushing hazard
Danger from suspended load
Pressure injection hazard
Explosion-proof component
Electrostatic sensitive components
Wear personal safety equipment
(goggles)
Secure (lock) the closing device
against accidental starting of the
machine
Environmentally sound disposal
Explanation of symbols and signs
Explanation of symbols and signs
You will find these symbols, which warn of
specific dangers to persons, material assets,
or the environment, next to all safety in-
structions in this lifecycle manual.
Read the instructions completely and follow
all operating instructions and the warning
and safety instructions.
Information symbols within the text
Symbol Meaning
Prompts an action
Used for itemizing
Refers to other facts, causes, or consequences
Provides additional information within procedures
Warning level Consequence Probability
DANGER Death / serious injury Immediate
WARNING Serious injury Possible
CAUTION Minor injury Possible
NOTE Property damage Possible
Symbol

8
EN
Instructions placed directly on the product,
such as:
o Arrow indicators
o Fluid connection labels
o Warnings
must be followed and kept in fully
legible condition.
Explanation of symbols and signs
Abbreviations and conversion factors
Abbreviations
°C degrees Celsius sq.in. square inch
s seconds kp kilopond
dB (A) sound pressure level cu.in. cubic inch
i.e. that is mph miles per hour
< less than fpsec feet per second
± plus or minus °F degrees Fahrenheit
> greater than fl.oz. fluid ounce
e.g. for example in. inch
Ø diameter gal. gallon
incl. including
K Kelvin Conversion factors
kg kilogram Length 1 mm = 0.03937 in.
rh relative humidity Area 1 cm² = 0.155 sq.in.
kW kilowatt Volume 1 ml = 0.0352 fl.oz.
l liter 1 l = 2.11416 pints (US)
Min. minute Mass 1 kg = 2.205 lbs
max. maximum 1 g = 0.03527 oz.
min. minimum Density 1 kg/cm³ = 8.3454 lb./gal.
(US)
mm millimeter 1 kg/cm³ = 0.03613 lb./cu.in.
ml milliliter Force 1 N = 0.10197 kp
N Newton Speed 1 m/s = 3.28084 fpsec
Nm Newton meter 1 m/s = 2.23694 mph
oz. ounce Acceleration 1 m/s² = 3.28084 ft./s²
psi pounds per square inch Pressure 1 bar = 14.5 psi
hp horsepower Temperature °C = (°F-32) x 5/9
lb. pound Power 1 kW = 1.34109 hp
sq.in. square inch

99
1
ENEN
1. Safety instructions
1.1 General safety instructions
The operator must ensure that the instruc-
tions are read and fully understood by all
persons tasked with working on the product
or who supervise or instruct such persons.
The instructions must be kept readily available
together with the product.
The manual forms part of the product and
must accompany the product if sold to a
new owner.
The product described here was manufac-
tured according to the state of the art.
Risks may, however, arise from its usage
and may result in personal injury
or damage to property.
Any malfunctions affecting safety must be
remedied immediately.
In addition to the lifecycle manual, all statu-
tory regulations and other regulations for
accident prevention and environmental pro-
tection must be observed.
o The product may only be used in aware-
ness of the potential dangers, in proper
technical condition, and according to the
information in this manual.
o Personnel must familiarize themselves
with the functions and operation of the
product. The specified assembly and op-
erating steps and their sequences must
be observed.
o Any unclear points regarding proper con-
dition or correct assembly/operation must
be clarified. Operation is prohibited until
issues have been clarified.
o Unauthorized persons must be kept away.
o All safety instructions and in-house in-
structions relevant to the particular activity
must be observed.
o Responsibilities for different activities
must be clearly defined
and observed. Uncertainty seriously en-
dangers safety.
o Protective and safety mechanisms can-
not be removed, modified, nor disabled
during operation and must be checked
for proper function and completeness at
regular intervals.
If protective and safety mechanisms must
be removed, they must be installed im-
mediately following conclusion of work
and checked for proper function.
o Any malfunctions that occur must be
resolved according to responsibility. The
supervisor must be notified immediately
in case of malfunctions outside one's indi-
vidual scope of responsibility.
o Wear personal protective equipment.
o Observe the relevant safety data sheets
when handling lubricants/equipment.
1.2 General behavior when handling the product
1. Safety instructions

1010
ENEN
1.3 Qualified technical personnel
Only qualified technical personnel may install,
operate, maintain, and repair the products
described here.
Such persons are familiar with the relevant
standards, rules, accident prevention regu-
lations, and assembly conditions as a result
of their training, experience, and instruction.
They are qualified to carry out the required
activities and in doing so recognize and
avoid any potential hazards. The definition
of qualified personnel and the prohibition
against employing non-qualified personnel
are laid down in DIN VDE 0105 and
IEC 364. Relevant country-specific defini-
tions of qualified technical personnel apply
for countries outside the scope of
DIN VDE 0105 or IEC 364.
The operator is responsible for assigning
tasks and the area of responsibility.
The personnel must be trained and in-
structed prior to beginning work if they do
not possess the requisite knowledge.
Product training can also be performed by
SKF in exchange for costs incurred.
1.4 Electric shock hazard
WARNING
Electric shock
Assembly, maintenance, and re-
pair work may only be performed
by qualified technical personnel.
De-energize the product prior to
beginning work.
Local conditions for connections
and local regulations (e.g., DIN,
VDE) must be observed.
1.5 System pressure or hydraulic
pressure hazard
WARNING
System pressure
The product described here is
pressurized during operation.
Depressurize the product before
starting any assembly, mainte-
nance, or repair work.
WARNING
Hydraulic pressure
The product described here is
pressurized during operation.
Depressurize the product before
starting any assembly, mainte-
nance, or repair work.
1. Safety instructions

1111
1
ENEN
1.6 Operation
The following must be observed while working
on the product.
o All information within this manual and
the information within the referenced
documents
o All laws and regulations that the operator
must observe
o The information on explosion protection
according to Directive
1999/92/EC (ATEX 137), if applied
All relevant persons (e.g., operating personnel,
supervisors) must be informed of the activ-
ity prior to beginning work. Precautionary
operational measures / work instructions
must be observed.
o Take appropriate measures to ensure
that moving/detached parts are im-
mobilized during the work and that no
body parts can be pinched by unintended
movements.
o Assemble the product only outside the
operating range of moving parts, at an
adequate distance from sources of heat
or cold.
o Prior to performing work, the product
and the machine/system in which the
product will be integrated must be de-
pressurized and secured against unau-
thorized activation.
o All work on electrical components may be
performed only with voltage-insulated
tools.
o Fuses must not be bridged. Always re-
place fuses with fuses of the same type.
o Ensure proper grounding of the product.
o Drill holes required for assembly only on
non-critical, non-load-bearing parts.
o Other units of the machine/the vehicle
must not be damaged or impaired in their
function by the installation.
o No parts of the centralized lubrication
system may be subjected to torsion,
shear, or bending.
o Use suitable lifting gear when working
with heavy parts.
o Avoid mixing up/incorrectly assembling
disassembled parts. Label parts.
1.7 Assembly / maintenance / malfunction / decommissioning / disposal
1. Safety instructions

1212
ENEN 1. Safety instructions
1.9 Foreseeable misuse
Any usage of the product differing from
the aforementioned conditions and stated
purpose is strictly prohibited. Particularly
prohibited are use:
o In another, more critical explosion
protection zone
o To feed / forward / store Group 1 dangerous
fluids according to Directive 67/548/EEC
o To feed / forward / store gases, liquefied
gases, dissolved gases, vapors, or fluids
whose vapor pressure exceeds normal at-
mospheric pressure (1013 mbar) by more
than 0.5 bar at their maximum permissible
operating temperature
1.8 Intended use
Modular feeders (progressive feeders) of the
series PSG are designed for positively driven
distribution of lubricants (oils/greases) in
centralized lubrication systems.
The maximum inlet volumetric flow of the
PSG1 is 0.8 l/min, 2.5 l/min for the PSG2,
and 6.0 l/min for the PSG3.
The maximum permissible operating pressure
is 200 bar in all three basic designs. This
may be lower if attachments are connected.
Consult and comply with the relevant data
from Chapter 4, "Technical data."
The inlet and outlet screw unions and their
connecting lines must be designed for the
permissible maximum pressure.
The technical requirements for the instal-
lation of the modular feeders are set out in
Chapter 6, “Assembly.” These requirements
must be complied with. The same applies
to the technical specifications in Chapter 4,
“Technical data.”
Any other or additional usage of modular
feeders of the series PSG is deemed non-
compliant with the intended use.
Modular feeders of the series PSG are
classified as components according to
the VDMA Position Paper "Umsetzung
der Maschinenrichtlinie 2006/42/EG in
Zentralschmiertechnik" (implementation
of the Machinery Directive 2006/42/EC in
centralized lubrication systems). This docu-
mentation is designed as documentation for
these feeders.
PSG feeders are also available in designs
compliant with the ATEX Directive.
PSG ATEX feeders may only be used in the
permitted potentially explosive atmosphere,
which is indicated on the feeder rating
plate. Any alterations or attachments to
ATEX feeders are strictly prohibited.
This documentation is designed as operat-
ing instructions according to EC Directive
94/9/EC (ATEX) for these feeders.

1313
1
ENEN
1. Safety instructions
Only the feeder types tested and approved
by SKF in accordance with ATEX Directive
2014/34/EU are permitted to be used in
potentially explosive atmospheres.
The relevant class of explosion protection is
indicated on the feeder rating plate.
o A written work authorization from the
operator is required prior to start-
ing installation in potentially explosive
atmospheres.
o Assembly work can be performed only if it
is ensured that no explosive atmosphere
is present.
o Before commissioning the product, the
operator must take all ATEX-relevant
safety precautions
and conduct all relevant ATEX tests.
o The introduction of ignition sources such
as sparks, open flames, and hot surfaces
into potentially explosive atmospheres is
prohibited.
o The electrical circuit of the piston detector
or proximity switch must be established by
an intrinsically safe circuit, e.g., through
the installation of an ATEX-compliant iso-
lating switch by the customer.
Only lines that are made of corrosion-
resistant stainless steel may be used.
These must also be grounded.
o When installing the product, make
sure that the setup location is flat and
low-vibration.
o While working, use only ESD tools or
ensure that no potentially explosive at-
mosphere is present.
o The product must undergo a function and
leak test at regular intervals.
o Perform appropriate repairs in the event
of damage, leaks, or rust. Replace the
product if necessary.
o The operator must make sure through
the choice of the lubricant to be delivered
that no reactions capable of serving as
ignition sources will occur in conjunction
with the
1.10 Disclaimer of liability
The manufacturer shall not be held liable
for damage resulting from:
o Failure to comply with these instructions
o The use of lubricants/media not approved
for the feeder type
o Contaminated or unsuitable lubricants
o Installation of non-original SKF
components
o Inappropriate usage
o
Improper assembly, configuration or filling
o Improper reaction to malfunctions
o Non-observance of maintenance
intervals
o Independent modification of system
components
1.11 Explosion protection in ATEX

1414
ENEN 1. Safety instructions
1.12 Referenced documents
In addition to this manual, the following
documents must be observed by the
respective target group:
o The explosion protection document of the
operator
o Operational instructions / approval rules
o Instructions from suppliers of purchased
parts
o Manual for the insulation resistance tester
o Safety data sheet of the lubricant / equip-
ment used
o Project planning documents and other
relevant documents
The operator must supplement these docu-
ments with applicable regulations for the
country of use. The documentation must be
included if the product is transferred to a
new operator.
anticipated potentially explosive
atmosphere.
o The lubricant’s ignition temperature has to
be at least 50 kelvin above the maximum
surface temperature (temperature class).
o Explosion protection measures must nev-
er be deactivated, changed, or bypassed.
ATEX approval is nullified by:
Any usage of the product differing from the
aforementioned conditions and stated pur-
pose is strictly prohibited.
Particularly prohibited are:
o Use in another, more critical explosion
protection zone
o Use to feed / forward / store Group 1
dangerous fluids according to Directive
67/548/EEC
o Non-compliant usage
o Installation of non-original SKF
components
o Failure to comply with this manual and
referenced manuals.
o Use of non-specified equipment
o Failure to observe the prescribed
maintenance/refilling and repair
intervals.
o Unauthorized alterations.

1515
1
ENEN
1. Safety instructions
1.13 Residual risks
Residual risk Remedy
Life cycle: Assembly
People slipping due to contamination of
floor with spilled/leaked lubricant
• Exercise caution when connecting the product’s hydraulic connections
• Promptly apply suitable binding agents and remove the leaked/spilled lubricant.
• Follow operational instructions for handling lubricants and contaminated parts
Tearing/damage to lines when installed on
moving machine components
• If possible, do not install on moving parts; if this cannot be avoided, use flexible hose lines.
Life cycle: Commissioning / operation
Lubricating oil spraying out due to faulty
component fitting/line connection.
• Tighten all components securely or using the specified torques. Use hydraulic connections
and lines suitable for the indicated pressures. These must be checked for proper connection
and for damage prior to commissioning.
Life cycle: Setup/retrofit/malfunction/troubleshooting/maintenance, repair/shutdown/disposal
Environmental contamination by lubricants
and wetted parts
• Dispose of contaminated parts according to the applicable legal/company rules
People slipping due to floor contamination
with spilled/leaked lubricant
• Exercise caution when disconnecting the product’s hydraulic connections
• Promptly apply suitable binding agents and remove the leaked/spilled lubricant.
• Follow operational instructions for handling lubricants and contaminated parts
Environmental contamination by lubricants
and wetted parts
• Dispose of contaminated parts according to the applicable legal/company rules

16
EN 2. Lubricants
2. Lubricants
2.1 General information
Intended use is the use of the products for
the purpose of providing centralized lubri-
cation/lubrication of bearings and friction
points using lubricants within the physical
usage limits which can be found in the doc-
umentation for the devices, e.g., operating
instructions and the product descriptions,
e.g., technical drawings and catalogs.
Particular attention is called to the fact that
hazardous materials of any kind, especially
those materials classified as hazardous
by EC Directive 67/548/EEC, Article 2, Para.
2, may only be filled into SKF centralized
lubrication systems and components and
delivered and/or distributed with such sys-
tems and components after consulting with
Selection of a lubricant suitable for the
lubrication task is made by the machine/
system manufacturer and/or the operator of
the machine/system in cooperation with the
lubricant supplier.
When selecting a lubricant, the type of
bearings/friction points, their expected load
during operation, and the anticipated ambi-
ent conditions must be taken into account.
All economic and environmental aspects
must also be considered.
NOTE
Observe the instructions from the machine
manufacturer regarding the lubricants that
are to be used.
The amount of lubricant required at a
lubrication point is specified by the bearing
or machine manufacturer. It must be en-
sured that the required quantity of
lubricant is provided to the lubrication
point. The lubrication point may otherwise
not receive adequate lubrication, which can
lead to damage and failure of the bearing.
2.2 Selection of lubricants
and obtaining written approval from SKF
Lubrication Systems.
No products manufactured by SKF Lubrication
Systems are approved for use in conjunction
with gases, liquefied gases, pressurized
gases in solution, vapors, or such fluids
whose vapor pressure exceeds normal at-
mospheric pressure (1013 mbar) by more
than 0.5 bar at their maximum permissible
temperature.
Other media which are neither lubricant nor
hazardous substance may only be fed after
consultation with and written approval from
SKF Lubrication Systems.
SKF Lubrication Systems considers lubricants
to be an element of system design that
must always be factored into the selection
of components and the design of centralized
lubrication systems. The lubricating properties
of the lubricants are critically important in
making these selections.
NOTE
All products from SKF Lubrication
Systems may be used only for their in-
tended purpose and in accordance with
the information in the product's operating
instructions.

17
2
EN
2. Lubricants
Please contact SKF Lubrication Systems
if you have further questions regarding
lubricants. It is possible for lubricants to be
tested in the company's laboratory for their
suitability for pumping in centralized lubri-
cation systems (e.g., "bleeding").
You can request an overview of the lubricant
tests offered by SKF Lubrication Systems
from the company's Service department.
The product described here can be operated
using lubricants that meet the specifica-
tions in the technical data. Depending on the
product design, these lubricants may be oils,
fluid greases, or greases.
Mineral, synthetic, and/or and rapidly bio-
degradable oils and base oils can be used.
Consistency agents and additives may be
added depending on the operating condi-
tions.
Note that in rare cases, there may be
lubricants whose properties are within the
permissible limits values but whose other
characteristics render them unsuitable for
use in centralized lubrication systems. For
example, synthetic lubricants may be in-
compatible with elastomers.
NOTE
Only lubricants approved for the product
may be used. Unsuitable lubricants can
lead to failure of the product and to prop-
erty damage.
2.3 Approved lubricants
NOTE
Different lubricants must not be mixed
together. Doing so can cause damage and
require costly and complicated cleaning
of the product/lubrication system. It is
recommended that an indication of the lu-
bricant in use be attached to the lubricant
reservoir in order to prevent accidental
mixing of lubricants.
NOTE
If necessary, SKF Lubrication Systems can
help customers to select suitable compo-
nents for feeding the selected lubricant
and to plan and design their centralized
lubrication system.

18
EN 2. Lubricants
2.5 Lubricant hazards2.4 Lubricants and the environment
NOTE
Lubricants can contaminate soil and wa-
terways. Lubricants must be properly used
and disposed of. Observe the local regula-
tions and laws regarding the disposal of
lubricants.
It is important to note that lubricants
are environmentally hazardous, flammable
substances which require special precau-
tionary measures during transport, storage,
and processing. Consult the safety data
sheet from the lubricant manufacturer for
information regarding transport, storage,
processing, and environmental hazards of
the lubricant that will be used.
The safety data sheet for a lubricant can be
requested from the lubricant manufacturer.
WARNING
Lubricants
Pumps must always be free of
leaks. Leaking lubricant is hazardous
due to the risk of slipping and inju-
ry. Beware of any lubricant leaking
out during assembly, operation,
maintenance, or repair of central-
ized lubrication systems. Leaks
must be sealed off without delay.
Leaking lubricant is a serious hazard. Leak-
ing lubricant can create risks that may result
in physical harm to persons or damage to
other material assets.
NOTE
Follow the safety instructions on the
lubricant's safety data sheet.

1919
3
General
Modular feeders (progressive feeders) of the
series PSG are designed for positively driven
distribution of lubricants (oils/greases) in
centralized lubrication systems.
The inlet and all outlets of the feeders are
located in the baseplate. The functional sec-
tions are attached to the baseplate and can
be replaced without loosening the tubing.
The volumetric flow fed via a tube is forcibly
distributed in a predetermined ratio to the
outlets, i.e., to the lubrication points or
downstream progressive feeders. Pistons
aligned in series meter the lubricant for
two opposite outlets each and control the
function of the neighboring piston. In this
way, the function of the modular feeder can
be checked by monitoring any piston (with
a cycle indicator or piston detector) or the
inlet volumetric flow (with gear-type flow
indicator).
2
EN
3. Overview/functional description
3. Overview / functional description
3.1 Overview of progressive feeders
Types and frame sizes, Fig. 1
VPK
PSG1 000 500 400 300 200 100
SPVSPSG2
PSG3
3 0004 0002 0002 5001 800
Q max. [cm³/min]
6 0005 0001 000 500 400 300 200 1003 0004 0002 0002 5001 8006 0005 000
VPVPB
246135
SPVSVPB 4545
Q max. [cm³/min]
VPVPK
PSG1
700 700

2020
3.2 Information on volume data
In centralized lubrication systems, the nom-
inal volume is indicated per stroke. This is
calculated from the piston diameter and the
maximum possible stroke of the particular
metering piston, the maximum stroke. The
maximum achievable piston capacity is
typically used as the nominal volume when
configuring a progressive feeder, though
the movement of the piston is influenced by
various factors such as:
o Differences in back pressures at the
outlets, for example due to long tubing
lengths or connected roller bearings or
shaft bearings.
o Stroke frequency (dynamics)
o Working temperature, viscosity
o fluctuations due to strong temperature
changes
The maximum stroke and thus the piston
capacity/metered quantity can reduce due
to these factors.
The minimum piston stroke, also referred
to as the compulsory stroke, is determined
by the position of the control borings in the
feeder and the control edges on the metering
piston. If only the compulsory stroke is per-
formed, the metered quantity at the affected
outlet is reduced, which also increasing
the effective number of piston strokes. The
theoretically determined number of piston
strokes can therefore deviate from the actual
measured value. This must be considered
when evaluating pulses on feeders with a
mounted piston detector.
The ratio of piston capacity per feeder
outlet determines the distribution ratio of
the quantity of lubricant supplied to the
feeder. This distribution ratio is usually
constant under all operating conditions.
Figure 2 shows the piston positions of a
feeder module at maximum stroke and at
compulsory stroke (minimum stroke).
Maximum stroke and compulsory stroke,
Fig. 2
Maximum stroke
Shown: Maximum stroke for piston 1 and
piston 2
Shown: Compulsory stroke for position
of piston 1
Compulsory stroke
EN 3. Overview/functional description