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Cashco — MODEL 521 TOTAL TFE, GLOBE-PATTERN CONTROL VALVE

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                  APPLICATIONS

handling chlorine (wet or dry); bromine; hydrochloric, sulfuric,nitric, and hydrofluoric acids; and most industrial reagents.
Also performs well in alkaline or strong basic fluids and most
or gan ics. Refer to Section "Chemical Resistance" on pages
8 and 9 for additional application information.
                    DESIGN FEATURES
The Model 521 combines the TFE corrosion resistance with
superior design and construction for the Chemi cal Process
In dus try:
• Unibody TFE construction mini mizes po ten tial 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.


GENERAL SPECIFICATIONS
Body Sub-Assembly


Body Form:

Globe style; straight body pattern.


Body Sizes:

1/2", 1", 1-1/2" and 2"; (DN 15, 25, 40 and 50).

Pressure Vs. Temperature application zone
indicated in Graph No. 1:


MaximumPres sure &Working Temperature:

Pressure:

Up to 275 psig (19.0 Barg).
Full Vacuum: Down to 0 psia (-14.7 psig,
-29.92" Hg); 0 BarA (-1.01 Barg, -760
mm Hg).
Temperature Range: 0° to +310°F
(-17.4° to + 155°C).


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. Mating bolt circle dimensions
in accordance with DIN standard
2501 and ISO 2084, classes PN16, PN25
and PN40. Bolt holes drilled and tapped
to receive metric bolting. Provided with
compression molded TFE annular adapter
gaskets to ensure proper loading of integral
body gasket. (See Figure 2). Recommended
to use flange gasket.


Stem Seal:

Dual design —Primary Seal: TFE bellows with 100,000full stroke cycle design life.
Secondary Seal: TFE “V-ring” pack ing.

Seat Leakage:

ANSI/FCI 70-2 (Rev. 2006), Class VI.
Flow Direction:

Standard is Flow-to-Open (FTO).
Inherent Flow Characteristic:

Standard – Equal Percentage (Equal %).
(Characteristic only maintained in FTO
direction.)
Maximum Pres sure Drop:

Up to 275 psid (19.0 Bard). Dependent on
ac tua tor size and bench set selection. See
Table 2.

Seat Design:

Integral TFE seat. Replaceable TFE plug-tip


Flow Capacity Range:

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See Table 1 for theoretical Cv @ % travel.
Equal % Characteristics - available in all
trim sizes.

Rangeability:

Standard – 50:1, except 1/4" (6 mm) orifice.
Minimum – 25:1 for 1/4" (6mm) orifice.
See Table 1.


Actuator Sub-Assembly Models: C27 & C53


Design:Spring-diaphragm type.

AmbientTemp. Range:

-50 to +180°F (-45 to +83°C).
-20° to +140°F (-29° to +60°C) with
elec tri cal accessories.


Bench Set:See Table 2.


Supply Pressure:

See Table 2. Design Max is 100 psig.


Stroke:1/2" Size = 0.500"
1" through 2" Size = 0.750".

SupplyConnection:

1/4" female NPT.
MountingPosition:

Model Horizontal-to-vertically up, and all
angles in between.
Painting:

Standard – All non corrosion resistant
portions are powder coated per Spec.
S-1743 and/or with corrosion resistant ep oxy
paint per Cashco Spec #S-1606.
Alternate: See Opt-95.
Sizes, Strokes& Volumes:See Table 3.

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MATERIALS SPECIFICATIONS
Body Sub-Assembly


Body, Plug Head& Bellows:

Isostatically compacted, high density TFE
- tetrafluoroeth ylene; i.e. PTFE – polytetrafluoroethylene. Pre ci sion ma chined.
(Note: TFE or PTFE are used as ab bre viations;
they are the same material.)


Body Shell andBonnet:

Investment castings. Cast 304 SST per
ASTM A351-CF8.


Body & BonnetBolting:18-8 SST.


Bonnet Gasket:TFE.


SecondaryPacking:TFE – “V-ring”.


Belleville SpringWashers:18-8 SST.

StemAssembly:

Standard: 316 SST stem and anti-ro ta tional
stop; 420 SST pin (body sizes 1/2" (DN 15)
and 1" (DN 25)), silver soldered (body sizes
1-1/2" (DN 40) and 2" (DN 50)). Em bed ded
stem-to-bel lows con nec tion nut of 316 SST.
Optional: Two optional stem con struc tions
available - both utilize Hastelloy body to
bonnet bolting.


Option “D” – Hastelloy C-22 stem, antirotational
stop and pin, and em bedded
stem-to-bellows connector nut.
Option “F” – Hastelloy C-22 stem only.
Stop and pin of standard materials.


NOTE: Alternate stem materials should
be considered when the fluid is known to
permeate TFE and is corrosive to 316 SST
in the pres ence of moisture. See Section
“Chemical Re sis tance” and Op tions “D”
and “F” above.

Packing Follower:18-8 SST.

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