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Paraflow Plate Heat Exchanger
Instruction Manual
Issue 5 Section 3.0
June 13, 2008 Page 13 of 36
3.3 Gaskets
The seal between the plates is achieved by a single
gasket around the perimeter of the plate and a
double gasket around the two through ports. This
double gasket separates the port from the heat
transfer area with a double barrier. The space
between the double gasket is vented to atmosphere
to prevent cross contamination.
(Figure 7).
Interlocking Gaskets
APV Paraflow Plate Heat Exchanger plates have
interlocking gaskets with upstanding lugs and
scallops evenly spaced around the outside edges.
These scallops ensure that there are no
unsupported portions of the gaskets and, in
combination with the patented form of the pressed
groove, provide mechanical plate-to-plate support
for the sealing systems. The upstanding lugs
(Figure 8) maintain plate alignment in the Paraflow
during plate pack closure and operation. The
groove form provides 100% peripheral support of the
gasket, leaving none of the material exposed to the
outside. In addition, the gasket exposure to the
process liquid is minimized by the full depth plate
gasket groove.
Gasket Materials
As detailed in Figure 9 , various gasket materials are
available as standard which provide chemical and
temperature resistance coupled with excellent
sealing properties. Other gasket materials are
available for special applications. Gasket material
selection must take into consideration the chemical
composition of the fluids involved as well as the
operating conditions.
Materials Application
Paracil
General Purpose material for aqueous
and fatty duties
EPDM
High temperature general purpose
material for chemical and steam
applications
Paraflor
Mineral oils, acids, steam and hot water
at high temperatures
Paradur Organic solvents, chemicals and sulfuric
acid
Paraprene
(Neoprene) Refrigeration duties with ammonia and
freon.
Figure 9
Gasket Attachment
APV Paraflow Plate Heat Exchanger gaskets are
attached to individual plates by one of two methods,
glued or clip in. The glued in gaskets are attached
by a thermoplastic adhesive which is heat cured for
maximum strength.
Figure 8
Figure 7
Kemper County MM218132 Approved