Data Sheet

YD and YS Valves
D100031X012
Product Bulletin
51.1:YD
June 2014
22
Figure 8. Fisher YD and YS Dimensions (also see table 9)
D
A2
A
MATCH LINE
FOR ACTUATOR
A2
A1893A-1
D
C
A
MATCH LINE
FOR ACTUATOR
A2
A1893A-1
NPS8YDandYSHIGHTEMPERATURE
Table 11. Bonnet Selection Guidelines
BONNET STYLE PACKING MATERIAL
IN-BODY PROCESS TEMPERATURE LIMITS
(1)
_C _F
Plain (standard)
PTFE V-ring -18 to 232 0 to 450
PTFE/composition -18 to 232 0 to 450
Graphite ribbon/filament -18 to max shown in table 5 0 to max shown in table 5
Style 1 cast extension
PTFE V-ring
-46 to 427 -50 to 800
PTFE/composition
Graphite ribbon/filament -46 to max shown in table 5 -50tomaxshownintable5
Style 2 cast extension
PTFE V-ring
-101 to 427 -150 to 800
PTFE/composition
Graphite ribbon/filament -101 to max shown in table 5 -150 to max shown in table 5
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
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 the packing damage which could result from the formation of valve stem frost. Material selection for trim and other components will also be
limiting factors.