PRESSURE/TEMPERATURE LIMITATIONS OF SOFT SEAT INSERT SEAT MATERIAL
TRUNNION M0UNT
BAR PSI
500 7250
PEEK
DEVLON V
400 5800
DELRIN
300 4350
P.C.T.F.E. (KEL 'F)
200 2900
REIFORCED PTFE
100 1450
VI RGI N PT
0 0
°C -200 -150 -100 -50 -0 +50 +100 +150 +200 +250 +300 °C
°F -328 -238 -148 -58 +32 +122 +212 +302 +392 +482 +572 °F
Starline Torque and Seat PT Ratings - AS
SEATS AND SEALS MATERIALS
SEAT MATERIALS
STARLINE TEMPERATURE RANGE
MATERIAL TYPE APPLICATION RECCOMENDATIONS
CODE °C °F
REINFORCED PTFE -190 -310 Medium pressure Higher temperature and Pressure than Virgin
STANDARD
S 20% Carbon + 5% Graphite +260 +500 Low/High temperature PTFE. Good for Steam Service
-196 -319 Low pressure All services subject to
T VIRGIN PTFE +200 +392 Low torque – Low temperature temperature limitation.
REINFORCED -196 -310 Medium pressure Auto lubricant properties –
B PTFE +BRONZE +250 +482 Low/High temperature recommended for steam
DEVLON – V -100 -148 High pressure
N POLYAMIDE – NYLON +155 +311 High temp – Low temperature
H2S and Hydrocarbons
-90 -130 Low pressure – Not suitable for high cycles or
G GRAPHITE
HIGH PERFORMANCE
+350 +662 High temperature automated valves.
DELRIN -70 -94 High pressure Hydrocarbons. Nace.
D ACETAL RESIN +95 +203 Low temperature Co2. Do not use for oxigen
PEEK -80 -62 High pressure Hydrocarbons. Nace.
P POLYETHER KETONE +250 +482 High temperature For Tobacco and Nuclear Service
VESPEL SP 21 -200 -328 High pressure Good Chemical Resistance. For Gas,
E POLYIMIDE + 260 +500 High temperature Oil, Petroleum. Not for Steam
UHMWPE -150 -240 Low pressure Food and Tobacco industries.
U POLYETHILENE +150 +300 Low torque Nuclear service
KEL’F -196 -319 High pressure Like virgin ptfe but improved resistance to nitric acid,
K PCTFE +150 +302 Low temperature hydrofluoric acid and liquid oxygen.
-60 -76 Medium pressure Lower Porosity – Particularly Good to
Y PFA +250 +482 Low/Medium temperature Avoid Polymerisation
M METAL SEAT -200 -328 High pressure – Abrasion and high temperature
(tungsten carbide or chrome carbide) +500 +932 High temperature applications
SEAL MATERIALS
STARLINE
CODE MATERIAL TYPE TEMPERATURE RANGE °C APPLICATION
+120 CONTINUOS
N NITRILE NBR -30 +150 INTERMITTENT
Water
H HYDROGENATED NITRILE HNBR -46 +160 CONTINUOS H2S, crude oil, hydrocarbons, small
+180 INTERMITTENT concentration of methanols
+160 CONTINUOS H2S, crude oil, hydrocarbons, small
E MODIFIED HYDROGENATED NITRILE HNBR-LT -55
+180 INTERMITTENT concentrations of methanols
FLUOROELASTOMERS +220 CONTINUOS
V (VITON B) FKM -20
+230 INTERMITTENT Sour gas, hydrocarbons
“O” RINGS
FLUOROELASTOMERS +230 CONTINUOS
V (VITON AED) FKM -29
+250 INTERMITTENT
Sour gas, hydrocarbons
FLUOROELASTOMERS +220 CONTINUOS
V (VITON GLT) FKM -46 (-40 continuous) +250 INTERMITTENT
Sour gas, hydrocarbons
C PERFLUOROELASTOMERS +315 CONTINUOS Sour gas, hydrocarbons, high % of
(CHEMRAZ 526) FFKM -25 +350 INTERMITTENT methanol
PERFLUOROELASTOMERS
K (KALREZ) FFKM -25 +325 Sour gas and corrosive fluids
A AFLAS FEPM +5 +200 Amine / Methanol service
I SILICON+PFA -60 +250 Low temperature applications/ Good
Chemical Resistance
G +680 Used on Metal Seated High
SPECIAL
EXPANDED GRAPHITE -240
Temperature valves
L LIPSEAL -196 +260 Good for Chemical Resistance
FIRE SAFE SEAL
STARLINE
CODE MATERIAL TYPE TEMPERATURE RANGE °C APPLICATION
G GRAPHITE -200 +400 All - excluding clean services
Values indicated are the original values given by the manufacturers. Additional limitation to these values shall be considered
based on the size of valve, seat construction and valve operating pressure.
SEAT PRESSURE/TEMPERATURE RATING - FLOATING
This table express the Seat material resistance as declared by the original manufacturers. The values are to be mixed
with the other parameters such as other non metallic seals as well as temperature limitations on metals used as per
by ASME B16.34
BAR PSI
500 7250
DEVLON - V “N”
400 5800
300 4350
P.C.T.F.E. (KEL’F) “K”
REINFORCED PTFE GLASS
200 2900
REINFORCED PTFE CARBON
POLYETYLENE “U”
VIRGIN PTFE “T”
100 1450
GRAPHITE “G”
0 0
ºC -200 -150 -100 -50 0 +50 +100 +150 +200 +250 +300 ºC
ºF -328 -238 -148 -58 +32 +122 +212 +302 +392 +482 +527 ºF
THE ASME PRESSURE CLASS RATING OF THE VALVE IS NOT TO BE EXCEEDED.
Starline-Floating-Seat-Pressure-Temp-v3 - TS
Starline Torque and Seat PT Ratings - AS
FLOATING
