Parr Instrument Series 4560 - Manual (Page 6)

Mini Bench Top Reactors
P a r r I n s t r u m e n t C o m p a n y 6
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 or Removable Head
Vessel Design
In the fi xed head design, the head of the vessel
may remain fi xed 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 charg-
ing, product recovery, and cleaning.
There is no difference in the pressure or tempera-
ture limits or basic operating instructions based
upon the fi xed head or movable vessel options.
There are differences in the design of the stand
components which adapt the vessels to the support
system.
Fixed Head with O-ring
Flat PTFE Gasket or Self Sealing
O-ring Closure
The fl at gasket is held in a recess in the vessel head
and a machine pilot on the cylinder closes the re-
cess 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 sys-
tem does not require nor have the cap screws used
with the fl at gasket.
Maximum temperatures of a given system are de-
pendant upon the material of construction and type
of seal. Other accessories may limit operating tem-
perature. The fl at PTFE gasket can be used to operat-
ing temperatures as high as 350 °C. The fl at fl exible
graphite gasket can be used to operating tempera-
tures as high as 500 °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 fl uoroelastomer (FKM) which
has a 225 °C maximum operating temperature limit.
Moveable Head with Flat Gasket