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4560 Mini Bench Top Reactors
Parr Instrument Company
Revision 6-28-02
Fixed Head or Removable Head
Vessel Design
In the fixed head design, the head of
the vessel may remain fixed in the reactor
support stand. All attachments to the head,
gas and liquid feed and discharge lines,
cooling water, vapor take-off and condenser,
thermocouple, and any electrical leads can
remain permanently in place. The reactor is
opened by removing the cover clamp
sections and lowering the cylinder away
from the head. In the removable vessel
design, the entire vessel must be removed
from the support stand for charging, product
recovery, and cleaning.
There is no difference in the pressure
or temperature limits or basic operating
instructions based upon the fixed head or
movable vessel options. There are
differences in the design of the stand
components which adapt the vessels to the
support system.
Flat PTFE Gasket or Self Sealing O-
Ring Closure
The flat gasket is held in a recess in
the vessel head and a machine pilot on the
cylinder closes the recess to completely
contain the gasket. The split ring closure
used with this gasket has six cap screws
which must be tightened to develop the
loading on the gasket.
The self sealing design features an
O-ring retained in a groove on the vessel
head. This design is self sealing and the
split ring used with this sealing system does
not require nor have the cap screws used
with the flat gasket.
The flat PTFE gasket can be used to
operating temperatures as high as 350 !C.
The maximum temperature of the vessels
equipped with O-ring seals depends upon
the material used for the O-ring. The most
common material is a fluoroelastomer (FKM)
which has a 225 !C maximum operating
temperature limit.
Parr Series 4560 Mini Reactors are furnished with two structural options in addition to
the size, pressure range, stirrer motor, controller and similar options. These are:
Fixed Head with O-Ring
Moveable Head with Flat Gasket
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