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Keofitt W9 User Manual

Keofitt W9
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KEOFITT W9 USER MANUAL V.4 PAGE 14
3.7 Membranes
All valve heads may be delivered with any of the 4 materials: Silicone, EPDM, PTFE and FFKM.
The only exception is the MicroPort Valve head, for which membranes are only available in Silicone and
EPDM.
They all have dierent properties and dierent resistance to various chemical substances, as seen in the
table below.
Resistance to - EPDM Silicone PTFE (Teon) FFKM
- weather and Ozone
- hydrolysis (water and
steam)
- to acids and bases
- mineral oil and gas
X
X=not suitable =less suitable =Suitable =Very Good =Excellent
Put in words the properties can also be described like this:
The Silicone membrane has the advantage that it in general can withstand high
temperatures, but it cannot tolerate moisture condensation resulting from steam
sterilisation
The EPDM membrane is better able to cope with the condensation in the steam and at
the same time it can be used with a majority of CIP uids and disinfectants in normal
concentrations
The PTFE membrane resists all CIP uids and disinfectants except highly oxidising acids in
high concentrations
The FFKM covers the highest temperature range and has excellent chemical resistance to
virtually any chemical compound
Membranes in rubber materials like EPDM, Silicone and FFKM are fully interchangeable (except for the
MicroPort version). This means that you may change from for instance Silicone to EPDM, if required.
However, valve heads with PTFE membranes are designed dierently from the others. As PTFE is a sti
material with no elastic properties, it cannot be stretched. Therefore, it is made with a bellow to allow for
the valve movement.
If you would want to upgrade from Silicone/EPDM to PTFE, it is necessary to contact your local Keott
dealer or Keott directly.
NOTE! The membrane functions as a dynamic seal in the valve seat as well as a hygienic static
sealing against the valve head.

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Keofitt W9 Specifications

General IconGeneral
BrandKeofitt
ModelW9
CategoryControl Unit
LanguageEnglish