Model 521
SKU#:
Model 521
Description
The Cashco Model 521 is a sliding stem, globe style, bellows sealed, pneumatically actuated control valve designed to provide superior long-term performance and maximum corrosion resistance in pure chemical service.
The design allows for all wetted internal parts to be machined from a solid block of isostatically compacted, virgin TFE, thus ensuring maximum density and the lowest possible permeability. An additional design benefit is that the wall thickness integrity is ensured as a result of the TFE body being internally machined after it is secured in a cast 304 SST body shell, thus preventing distortion problems related to the plastic stability of TFE. There is simply no better design or materials available when consideration is given to corrosion resistance and thermal stability.
Design Pressure
Maximum Allowable Working Pressure: Up To 275 psig (19.0 Barg)
Line Sizes
- 1/2" (DN15)
- 1" (DN25)
- 1-1/2" (DN40)
- 2" (DN50)
End Connections
- Standard – 150# RF flanged; gasketless design. Flange bolt circle per ANSI B16.5. Bolt holes drilled and tapped to receive flange bolting.
- Optional ANSI - 300# RF per above.
- Optional DIN - Standard ANSI raised face dimensions on body.
Features
- Unibody TFE construction minimizes potential leak paths.
- Dual stem seal design: 100,000 full-cycle bellows primary
- seal plus V-ring secondary stem seal.
- Anti-stem rotation device to prevent bellows damage.
- 304 SST body jacket resists external corrosion.
- Quick change trim with easily replaceable plug-tip.
- Four body sizes - 1/2", 1", 1-1/2", and 2"; (DN 15, 25, 40
- and 50).
- Wide selection of trim sizes and forms.
- 150# RF, flanged body with “gasketless” pipe-to-valve joint.
- Optional capability to mate with 300# RF.
- Optional capability to mate with PN16, PN25, or PN40 DIN
- flanges.
- Class VI shutoff.
- Spring-loaded bonnet seal.
- All wetted parts are machined from isostatically compacted
- TFE.
- May be applied in full vacuum service.
- Standard Actuator compliant with IEC 60534-6-1 for
- mounting standardized positioners.
| Line Size | 1/2" (DN15), 1" (DN25), 1.5" (DN40), 2" (DN50) |
|---|---|
| End Connections | RF Flanged |
| Service | Gases, Liquids |
| Body Material | TFE |
