Technical Specifications

21000 Series Control Valves Technical Specifications | 3
n Flow Direction
contoured: flow-to-open/flow-to-close
Lo-dB: flow-to-open
anti-cavitation: flow-to-close
n Body
type: high capacity globe
high capacity angle
n Bonnet
type: bolted standard
bolted extension
bolted cryogenic
n Body and Bonnet
materials: carbon steel
316 stainless steel
chrome-molybdenum steel
others
n Trim
plug type: contoured
soft seat
Lo-dB (1 or 2 stages)
anti-cavitation (1 or 2 stages)
seat ring: threaded
quick change
guide: heavy top guided
capacity: full area
reduced capacity in all sizes
C
V
ratio: 50:1
flow
characteristic: linear
equal percentage
modified percent
n Actuator
type: spring diaphragm
handwheel: optional
General Data
Flow
Characteristics
Optional
Configuration
Numbering System
1st 2nd
5th4th3rd2nd1st 6th
Actuator Type
0. Undefined
1. Contoured
6. Soft Seat
7. Single Stage
Lo-dB/
Anti-Cavitation
8. Double Stage
Cavitation
Containment
9. Double Stage
Lo-dB
Plug Type
Body
Series
21
A Angle Body
BS Bellows
Seal
EB Extension
Bonnet
C Cryogenic
0. Undefined
4. Quick Change
5. Threaded
Seat Type
0. Undefined
1. Linear
2. Equal
Percentage
3. Modified
Percent
87 Spring Diaphragm
Air to Close
88 Spring Diaphragm
Air to Open