Burkert Type 3236 - Manual (Page 20)

20
TechnicalData
Type 2035 / 3236
Connections
Port connections welded spigots DIN EN ISO 1127
(ISO 4200), DIN 11850 Series 2,
ASME BPE
SMS 3008, BS4825 (other welded con-
nections, clamps and sterile screw fittings
on request)
Pilot air port G1/8
Surface quality interior Ra 0.5 µm passivated
exterior Ra 3.2 µm glass bead blasted
optional electro-polished
(other surface finishes on request)
Installation position any position; preferably connection B
downwards; for self-drainage see chapter
"5.3. Valve self-draining"
Service life
The service life of the device depends heavily on the conditions of use.
Especially the service life of the diaphragm depends very heavily on
the conditions of use, such as the medium, temperatures, switching
frequency, pressure etc.
7.6.1. Diaphragm
The diaphragm seals the valve. It must be selected with care. The
choice of material should be made bearing in mind the process
medium, the temperature and the mechanical boundary conditions
(e.g. operating pressure, switching frequency etc.).
The standard materials are contained in the following table.
For conformity with FDA CFR 21 Para. 177.2600 or Para. 177.1550
and USP VI certification, see "Tab. 1: Diaphragm materials".
Diaphragm
material Description of
material Use FDA USP VI
EPDM peroxide-vulcanized
ethylene-propylene
rubber oxidizing
chemicals,
steam and hot
water x x
PFA /
EPDM PFA
laminated EPDM most chem-
icals and acids x x
FKM fluorinated rubber acids and
mineral oils x
silicone platinum-stabilized
silicone rubber aliphatic oils x x
PFR 91 PFR 91
fluorinated rubber aliphatic oils x
Tab. 1: Diaphragm materials
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