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Product brand informationDiaphragms
DiaphragmsSeparating, switching, regulating,accumulating, pumping
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Vibration Control
Special Sealing Products: Bellows, Diaphragms,Elastomer Composite Parts and Precision Mouldings
Lederer Liquid Silicone Products
ISC O-Ring
Integral Accumulator
Merkel Hydraulics / Pneumatics
Simmerring®
Simrit offers a complete package of
products and services, including leading
brands such as Simmerring®, Merkel,
Integral Accumulator, Lederer and
ISC O-Ring.
This way we secure competitive
advantages for you based on
experience all around the world:
Simrit has a presence through-
out Europe, America and Asia,
either directly or through its
affiliated companies NOK
(Japan) or Freudenberg-NOK
(USA). The transfer of know-
ledge between these markets isincorporated directly into the
Simrit service package.
With our many Simrit Service
Centres and Simrit distribution
Partners, we serve and supply
more than 100,000 customers
worldwide. Our Simrit Partners
ensure rapid availability from
stock. This means spare parts
quickly arrive when and where
they are needed. There is aSimrit Partner near you as well.
Simrit, Your GlobalTechnology Specialistfor Seals and VibrationControl offers you acomplete service pack-age. A unique rangeof products and servicesguarantees you nume-rous advantages over
the competition.
Simrit acts as a partner to
general industry. Its position as
a market leader is achieved
through continuous research,
development and manufacture.
We have the world’s widest ran-
ge of seals and vibration con-
trol products, and can offer you
solutions based on the demands
of state-of-the-art-technology,solutions which set standards.
Make the most of Simrit’s service
package and give yourself a
real competitive edge:
Constant innovations
Uniquely wide range of
products
Strong product brands
Unique materials expertise
A wide range of value
added services
Global cooperation and
partnership
Simrit®, Your Global Technology Specialistfor Seals and Vibration Control
2
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State-of-the-art Simrit® diaphragmsfor your applications
3
When design engineers have to
provide flexible connections for
components in specific applica-
tions, separate off areas bet-
ween them and simultaneously
ensure a leakproof partition,
this problem can almost always
be solved by using diaphragms
made of elastic materials.
As well as customised dia-
phragms we also offer a com-
prehensive standard range of
over 300 different dimensions.
This includes long-stroke rolling
diaphragms, diaphragms for
compressed air brake systems,
diaphragm fabrics (fabric coa-
ted with rubber on both sides)
as well as sheet goods made of
different materials and combi-
nations of materials.
Application examples:■ actuators
■ valves
■ breathing equipment
■ brakes
■ hydro accumulators
■ compressors
■ food processing industry
■ aerospace industry
■ pumps
■ sanitary installations■ valves and regulators
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Every diaphragm is a tailor-made solution
There is a difference whether a
diaphragm is used for control,
switching, accumulation or
pumping. In addition, the ope-
rating conditions and medium
have a direct impact on the de-
sign of a functional diaphragm
and the housing. At the initial
design stage it is already
necessary to take account ofdesign-related outline conditi-
ons such as
■ pressurisation on one or both
sides
■ ratio stroke to diameter
■ alteration of effective diame-
ter via the stroke
■ need for an insert and/or
covering using reinforcement
material.
For this reason we jointly de-
velop every diaphragm with you exactly in accordance with
the defined function.
Four fundamentaldiaphragm forms offerthe basis for tailor-madesolutionsWe use these four basic
diaphragm forms
■ flat diaphragm
■
dished diaphragm■ convoluted diaphragm
■ rolling diaphragm
to develop the best variant for
your application.
Flat diaphragm
Dished diaphragm
Convoluted diaphragm
Rolling diaphragm
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In addition, we optimise the
sealing bead for clamping. The
type of pressurisation also has
a major impact on whether
fabric reinforcement is incorpo-
rated in the diaphragm and in
what manner.
Calculated functionalreliability We use these basic parameters
to proceed with calculation,
simulation and detail optimisa-
tion. For the FEM calculations
we have our own material
models for elastomers.
With single-sided pressurisation a fabric reinforcement is positioned differently
in the diaphragm structure than with pressurisation on both sides.
Automated FEM calculations
ensure short, highly cost-
effective development and
optimisation times. Here the
experience of our staff is
a guarantee for the fast and
economical realisation of
customer-specific solutions.
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Modern technology makes use
of diaphragms made solely of
elastomer as well as a combi-
nation of elastomers with
■ fabrics for reinforcement
■ PTFE foils to protect against
attack from chemicals
■ metal or plastic inserts for
the transmission of power/
stroke and support.
With Simrit you have a partner
who can offer exemplary
know-how for the optimum
connection of these different
diaphragm components to
form a strong unit.
Strong thanks to fabric and foils
Strategic reinforcementIn particular the mechanical
properties of a diaphragm can
be optimised with fabric and
other new types of reinforce-
ment materials. To cater for the
operating parameters to opti-
mum effect when selecting the
appropriate reinforcement, we
use fabric reinforcement made
of polyester, polyamide andaromatic polyamide.
The location and position of the
reinforcement fabric is matched
to the operating conditions not
only via the diameter of the
diaphragm but also within the
layer structure. This means that
a reinforcement is always posi-
tioned where it has the greatest
effect on the long-term resi-
stance and life cycle costs of
your product.
Optimum protectionthrough PTFE foilcoveringFor aggressive media as often
occur with diaphragm pumps
PTFE foil coverings permanently
fixed to the diaphragm or modi-
fied PTFE foil coverings have
proved to be highly effective for
shielding. With foils made of
electrically conductive materialwe can supply components for
ATEX-compliant units.
Take advantage of our know-
how when it is also a question
of ensuring top-class solutions
for critical applications and dia-
phragms with a PTFE covering
are required for a truly reliable
solution.
Foil■ PTFE or modified
PTFE (TFM)
Fabric■ Polyester ■ Nomex
■ Polyamide ■ Aromatic Polyamide
Carrier part■ Steel
■ Aluminium
■ Plastic
Elastomer coating■ FKM ■ ACM ■ VMQ
■ EPDM ■ HNBR
■ AEM ■ NBR
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Over 400 elastomer blends for chemically, thermallyand mechanically optimised diaphragms
Pumping hydrochloric acid,
control with compressed air or
accumulation involving hydrau-
lic media – every diaphragm
must be exactly tailored to the
chemical, thermal and mechani-
cal stresses. Selection of the
elastomers depends on this.
But sealing at the clamping
area, processability, the controlprecision of the diaphragms or
permeation behaviour are also
criteria for the selection of
materials.
Virtually all of the standard
elastomers available today can
be used for the development of
your diaphragms e. g. NBR,
CR, VMQ and EPDM as well ashigh-performance elastomers
such as IIR, ECO, FKM, CSM,
HNBR, FVMQ or Simriz®
(FFKM). With over 400 blends,
Simrit offers the largest basis
for the strategic development of
diaphragms in the world.
These diaphragm materials of
course comply with the stan-
dards governing the relevant
application areas such as FDA,
BGA (German Federal HealthOffice), KTW, WRc, ACS,
NSF International or they have
approval via OEM customers.
Our own highly specialised
mixing systems and develop-
ment cooperation projects with
leading polymer and chemicals
manufacturers guarantee state-
of-the-art diaphragm develop-
ment.
EPDM
IIR
NR
SBR
AEM
CSM CO
HNBR
FFKM,FKM
ACM
FVMQ
NBR
MQ,VMQPVMQ,PMQ
170 100 80 60 40 20 10120A B C D E F G H K
70
100
125
150
175
200
225
250
CR
Class Vol.change (%)Oil resistance
Heat resistance °C
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In addition to a sound know-
ledge of materials and elasto-
mer development tailored to
diaphragms we can offer you
unique production know-how
based on the global pool of
knowledge of the Freudenberg
Group with its own Technical
Development Centre, research
facilities and partners NOK(Japan) and Freudenberg-NOK
(USA).
Controlled diaphragm productionto validation of components
Our outstanding experience in
the manufacture of diaphragms
of any diameter includes all
production steps: weighing
of the mixing components,
creation of the raw mixture,
production of blanks, pretreat-
ment of the carrier parts, deep-
drawing of fabrics, vulcanisa-
tion of diaphragms and also
the removal of burrs and sur-face treatment.
For elastomer processing
we used both compression
moulding (CM) and injection
moulding (IM). The CM process
has proved to be an ideal
production platform particularly
for diaphragms plus fabric,
foil and insert while IM is
suitable when manufacturing
diaphragms made solely of
elastomer or including a metalsection.
Diaphragms are manufactured in diameters ranging from a few millimetres to almost
1 metre in size. The smallest diaphragm produced to date has an outer diameter of
5.4mm with a vulcanised metal section 1.8 mm in diameter.
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We also coordinate the shaping
process to the respective requi-
rement profiles. At our plant
diaphragms are shaped by
punching, cutting, water jetcutting as well as laser beam
cutting, as shown here, to
ensure extremely precise dia-
phragm edges.
Our production processes are
exactly matched to your requi-
rements.
Test rigs for testingcomponentsFollowing development and ma-
nufacture the overall process is
completed with the validationof diaphragms. We subject dia-
phragms to rigorous testing on
your unit according to specified
test parameters.
Climatic cabinets are also
available to ensure that testing
corresponds to the actual ope-
rating conditions. This not only
includes low-temperature (down
to –40°C) and high-tempera-ture behaviour (+220°C) but
also the switching performance
of diaphragms. Service life
tests using different media and
variable switching cycles are
possible as well. If wished,
comprehensive validation docu-
mentation detailing the qualities
of the diaphragms in your spe-
cific unit can also be provided.
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As leakproof yet flexible parti-
tions between two component
areas, elastomer diaphragms
are extremely versatile construc-
tional elements.
With our extensive selection of
■ diaphragms made solely of
elastomer
■ fabric diaphragms■ PTFE-coated diaphragms
■ fabric diaphragms with
PTFE foil and
■ diaphragms with inserts
we offer you the widest possi-
ble range of solutions for three
entirely different main functions:
A fascinating variety of individual designsolutions offered by diaphragms
Control and switching via diaphragmsIf pressure is applied to the
active surface of a diaphragm,
it can be transformed into rod
force and used to actuate
switching, control or display
equipment.
Conveying and com-pressing via diaphragmsThe positive displacement
principle of all diaphragm
pumps is based on a force
acting on the diaphragm,
which displaces and thus
conveys a fluid from a defined
area.
Separating and accumu-lating via diaphragmsDiaphragms act on the one
hand as a flexible separating
element between media with an
identical or different pressure
level or on the other hand as
an accumulator with a flexible
barrier.
These fascinating properties are
the ideal basis for a variety of
applications in a whole number
of sectors.
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Take advantage of our know-how foryour innovative diaphragm solutions.
They range from valvesthrough medical enginee-ring to space travel.Diaphragms are used ascontrol and sealing ele-ments in valves found indrinks filling equipment. With diaphragm accu-mulators in hydraulic
systems a high level ofgas tightness is essential. Without diaphragmsgas pressure regulatorsor breathing equipment would not functioneither.
Thin-Walled SensitiveDiaphragms for Actua-ting and Regulating
ValvesThin-walled diaphragms with
or without fabric reinforcement
are needed to guarantee extre-
mely light response characte-
ristics in a regulating valve.
Special materials based on
silicone ensure appropriate
operational reliability at low
temperatures down to –100°C.
Silicone Diaphragms
Rolling diaphragms and returnflow diaphragms consisting
partially of oil-resistant solid
and liquid silicones with
excellent temperature stability
(up to 250°C) and flexibility
when subject to refrigeration
(down to –50°C). Customer-
specific designs for e.g. sani-
tary engineering and other
pneumatic applications.
Diaphragms forDiaphragm Pumpsand CompressorsModern technologies use both,
pure elastomer diaphragms
and also the combination of
elastomers with: fabric for
reinforcement, PTFE film as
protection against aggressive
chemicals and metal or plastic
insert components for force
or path transmission and as
support.
Accumulator Diaphragms
Diaphragms made from NBR,HNBR, ECO, IIR, EPDM and
other materials with extremely
low gas permeation and high
flexibility at low temperatures
for use in accumulators within
hydraulic systems (e.g. industri-
al Hydraulics).
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Product brand informationDiaphragms
5 0 G B 0 0 2 0 . 5
1 2 0 5 B r . A B T
Phone +49 (0) 1805 -S im r i t
Phone +49 (0) 1805- 746748Fax +49 (0) 18 03 - 74 67 48E-mail: [email protected]
Headquarters Europe:Freudenberg Simrit GmbH & Co. KG
69465 Weinheim, Germany
Simrit®, Your Global Technology Specialistfor Seals and Vibration Control
Innovative variety
Customised problem solutions
Development parameters
e.g.
Your Benefits
Simrit Services Your Benefits
Special Sealing Products: Diaphragms
Unique materials expertise
Specialised technological expertise
All from one source
Technological edgeConstant innovations
Uniquely wide range of products
Strong product brands
Longer unit service life
Competitive advantages, efficiency and lower costsA wide range of value added services
Locational advantage and knowledge transferGlobal cooperation and partnership
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