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4 Valve Description
22 of 100
4.3.3.1 Operating data
Table 16: Operating properties
Characteristic
Value
Nominal pressure
Class
800 - 2500
Nominal size
NPS
½
" - 2"
Max. permissible pressure
431
bar /
6250
PSI
Min. permissible temperature
0 °C / 32 °F
Max. permissible temperature
+538
°C /
+1500
°F
Temperatures < 0 °C on request
Selection as per pressure/temperature ratings
(
ð
Section 4.3.3.4, Page 24)
4.3.3.2 Fluids handled
▪
Steam
▪
Fluids containing gas
▪
Gas
▪
High-temperature hot water
▪
Fluids containing mineral oils
▪
Oil
▪
Feed water
4.3.3.3 Design details
Design
▪
Globe valve to API 602
▪
Tested to API 598
▪
Body made of forged steel
▪
Bolted bonnet (Class 800)
▪
Welded bonnet
▪
Outside screw
▪
Outside yoke
▪
Rotating stem
▪
Rising handwheel
▪
Stem sealed by gland packing
▪
Reduced bore
▪
Two-piece self-aligning gland follower
▪
Graphite gland packing
▪
Stem with burnished shank
▪
Fully confined bonnet gasket (Class 800)
▪
Back seat
▪
Solid valve disc
▪
Integral seat - ST6 (HF)
▪
The valves satisfy the safety requirements of Annex I of the European Pressure
Equipment Directive 97/23/EC (PED) for fluids in Groups 1 and 2.
▪
The valves do not have a potential internal source of ignition and can be used in
potentially explosive atmospheres, Group II, category 2 (zones 1+21) and
category 3 (zones 2+22) to ATEX 2014/34/EU.