General Purpose Pressure Vessels
P a r r I n s t r u m e n t C o m p a n y
12
HEAD ASSEMBLY GUIDE
Refer to this table for more information about Head Styles Listed in Series Working Limits and Parts List section.
Head Style
Description
One opening, TBD
One opening, size to be determined by user
“A” Socket
One Type “A” Socket opening, to be used with 4316 Gage Block Assembly
1
“B” Socket
One Type “B” Socket opening, to be used with 4317 Gage Block Assembly
1
VGR
Valve, gage, rupture disc, and thermocouple
2 3
Notes:
1) Reference pages 32-35 for more information about Gage Block Assemblies.
2) Number of valves varies amongst series. See individual heads for number of valves.
3) A thermowell with thermocouple is offered for most series if needed.
MATERIAL DESIGNATIONS
Material Designations for Alloys other than T316SS
For parts made from alternate materials use the codes shown below as a suffix to the standard part number.
CM -
Alloy 400
CC -
Alloy 20Cb3
CH -
Alloy C-276
CT -
Alloy 600
CAD -
Titanium G2
CXA -
Zirconium G702
CG -
Alloy B-2
CAA -
Titanium G4
CXB -
Zirconium G705
Gasket Material Designations
Common Trade Name Type of Material
ASTM Designations
Parr Suffix
Nitrile, buna-N
Butadiene / acryloelastomer
NBR
JB
Viton®
1
Fluoroelastomer
FKM
JV
Kalrez®
2
Chemraz®
3
Parofluor®
4
Perfluoroelastomer
FFKM
JK
Ethylene/ Propylene
Ethylene propylene Copolymer elastomer EP
JE
Teflon®
5
Tetrafluoroethylene polymer
PTFE
HA
Grafoil®
6
Flexible graphite
FG
KL
1) Viton® is a registered trademark of DuPont
2) Kalrez® is a registered trademark of DuPont
3) Chemraz® is a registered trademark of Green, Tweede & Co. Ltd.
4) Parofluor® is a registered trademark of Parker Hannifin Corporation
5) Teflon® is a registered trademark of DuPont
6) Grafoil® is a registered trademark of UCAR Carbon, Inc.