Parr Instrument Series 5500 - Manual (Page 6)

Compact 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
INSTALLATION
Flat PTFE Gasket
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 flat PTFE gasket can be used to operating
temperatures as high as 350 ºC.
Self Sealing O-Ring Closure
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 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 ºC maximum
operating temperature limit.
Moveable Head with PTFE Gasket Moveable Head with O-ring Seal & Easy Close Split Ring