Cage type double seated control valve for a wide range of applications with pressure rating up to ANSI2500.
- Vibration and wear resistant construction with the plug held directly in the cage
- Top-entry structure that is easy to disassemble and can be inspected and maintained in a short time
- SIL3 Capable - Certified by exida Corporation
| Structural drawing | Image
| Image
|
|---|---|---|
| Valve type | Cage type double seated control valve | High pressure service cage type double seated control vavles |
| Model No. | VDC_ _ _ | VDC_ _ _ |
| Size | 5", 10", 12" | 5", 10", 12" |
| Pressure rating | ANSI/JPI 150 to 600 JIS10K to 40K | ANSI/JPI 900 to 2500 JIS63K |
| End connection | Flanged : RF, FF, RJ | Flanged : RF, RJ Welded : SW, BW |
| Body material | Carbon steel Stainless steel | Carbon steel Stainless steel |
| Trim material | SCS24 SCS14A with CoCr-A or Atomloy treatment SCS16A, SCS16A with CoCr-A | SCS24 SCS14A, SCS14A with CoCr-A, SCS14A with Atomloy treatment SCS16A, SCS16A with CoCr-A |
| Temperature range | -195 to 600°C | 0 to 520°C |
| Leakage performance | Class II, III, VI | Class II, III |
| Cv range | 99 to 1440 | Class 1500 or less : 83 to 1180 Class 2500 : 56 to 820 |
| Range ability | 30:1 (option 50:1) | 30:1 (option 50:1) |
| Application | General-use process for petrochemical and chemical plant | High temperature and high pressure steam of boiler and turbine unit for power plant and private power generation |
| Option | Bellow seal bonnet, steam jacket | － |
A wide range of material specifications
Products can be provided by using different materials for valve stems - e.g., carbon steel is generally used with water, steam, and fuel oil; and high corrosion resistant stainless steel that is essential for controlling corrosive fluids.
Corresponding to service
The excellent anti-cavitation performance of these cage valves plays an essential role in controlling fluids at high temperatures and under high differential pressures. Optional specifications can be applied to reduce aerodynamic noise produced by steam and gas.
Excellent seat leakage performance
Metal sheet tight shut (class II, III) and soft sheet tight shut (class VI) are available.
Excellent external leakage prevention performance
A bellows seal can be added to valve stems. Increasingly sought-after specifications for gland packings can be applied to comply with fugitive emission regulations of volatile organic compounds.
High control performance
High control performance is achieved by a combination of wide rangeability and a smart valve positioner.
The original internal valve structure adopted by azbil essentially eliminated the shortcomings of conventional double-seated control valves that suffered from reversal of fluid reaction force, thereby achieving stable control.
