General Purpose Pressure Vessels
Parr Instrument Company
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.
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