Data Sheet

ET Valve
D100022X012
Product Bulletin
51.1:ET
December 2012
19
Table 11. Bonnet Selection Guidelines
BONNET STYLE PACKING MATERIAL
IN-BODY PROCESS TEMPERATURE LIMITS
(1)
_C _F
Plain:
JStandard for all valve sizes through NPS 6 with
2-13/16 yoke boss diameter
JStandard for NPS 6 and 8 valves in cast iron and WCC
steel bonnet material with 3-9/16 yoke boss diameter
PTFE V-ring -18 to 232 0 t o 450
PTFE/Composition -18 to 232 0 to 450
Graphite ribbon/filament 0 to 316
(2)
0 to 600
(2)
Style 1 Cast Extension:
JStandard for NPS 8 valves in S31600 bonnet material
with 3-9/16 yoke boss diameter
PTFE V-ring
-46 to 316
(2)
-50 to 600
(2)
PTFE/Composition
Graphite ribbon/filament
Style 2 Cast Extension:
JOptional for NPS 2 through 4 valve sizes with 2-13/16
inch yoke boss diameter
JOptionalforNPS6and8valveswith3-9/16 yoke boss
diameter. Not available for NPS 8 valve in S31600
bonnet material
PTFE V-ring
-101 to 316
(2)
-150 to 600
(2)
PTFE/Composition
Graphite ribbon/filament
ENVIRO-SEAL bellows seal bonnet
PTFE
For exceptional stem sealing capabilities. See Bulletin
59.1:070, ENVIRO-SEAL Bellows Seal Bonnets, for
pressure/temperature ratings.
Graphite ULF
For exceptional stem sealing capabilities. See Bulletin
59.1:070, ENVIRO-SEAL Bellows Seal Bonnets, for
pressure/temperature ratings.
1. These in-body process temperatures assume an outside, ambient temperature of 21_C(70_F) and no insulation on the bonnet. When using any packing at low process temperatures, a cast
extension bonnet may have to be used to prevent packing damage which could result from the formation of valve stem frost. Material selection for trim and other components will also be
limiting factors.
2. Temperatures above 232_C (450_F) require PEEK anti-extrusion rings and spring-loaded seal ring.
Table 12. Maximum Flow Coefficients for Full-Sized Trim with Equal Percentage Cage and Normal Flow Direction
Valve Valve Size, NPS Cv at Max. Valve Plug Travel
ET
1
1-1/2
2
2-1/2
3
17.2
35.8
59.7
99.4
136
4
6
8
(1)
8
(2)
224
394
567
819
EAT
with liner
1
2
3
4
6
18.5
48.1
149
152
336
without liner
1
2
3
4
6
19.0
47.2
148
156
328
ETR
1
1-1/2
2
2-1/2
3
4
17.2
35.8
59.7
99.4
136
224
1. With 51 mm (2 inch) travel.
2. With 76 mm (3 inch) travel.