Parr Instrument Series 5500 - Manual (Page 6)

Compact Micro Reactors
P a r r I n s t r u m e n t C o m p a n y 6
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 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 flat gasket.
The face seal O-ring with screw cap closure is de-
signed to be simply hand tightened.
The flat PTFE gasket can be used to operating tem-
peratures as high as 350 ºC. The maximum tem-
perature 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 ºC maximum operating tempera-
ture limit.
Moveable Head with PTFE Gasket Moveable Head with O-ring Seal & Easy Close Split Ring