CPVC Butterfly Valve
This CPVC (Chlorinated Polyvinyl Chloride) wafer butterfly valve controls flow in corrosive chemical and high-temperature liquid lines up to 200°F (93°C). Built with a full-liner seat design, the valve isolates the body from pipeline media.
Description
Products Description
This CPVC (Chlorinated Polyvinyl Chloride) wafer butterfly valve controls flow in corrosive chemical and high-temperature liquid lines up to 200°F (93°C). Built with a full-liner seat design, the valve isolates the body from pipeline media. It replaces stainless steel or lined metal valves in medium-pressure applications, reducing piping system weight and eliminating external galvanic corrosion. Compatible with ANSI B16.5 Class 150 bolt patterns, it fits directly between standard flanges.
Key Product Characteristics
Full-Liner Body Isolation: The elastomer liner fully covers the inner body wall and flange face, eliminating liquid contact with the valve housing and preventing stem leakage.
Corrosion & Temperature Resistance: Cell class 23447 CPVC material maintains structural rigidity and chemical inertness under hot acid, alkali, and saline flow conditions.
Low Operating Torque: Dual shaft O-ring seals combined with an optimized disc profile reduce opening and closing torque requirements, extending actuator service life.
ISO 5211 Direct Mounting Pad: Integrated top flange allows direct mounting of pneumatic or electric actuators without external brackets or drop-in adapters.
Bi-Directional Sealing: Symmetrical disc geometry ensures bubble-tight shutoff (Class VI) regardless of flow direction.
Key Specifications
|
Parameter |
Specification |
|
Size Range |
DN50 – DN300 (2" – 12") |
|
Pressure Rating |
150 PSI (10.3 bar) @ 73°F (23°C); de-rated to 50 PSI @ 200°F (93°C) |
|
Temperature Range |
32°F to 200°F (0°C to 93°C) |
|
Body & Disc Material |
Cell Class 23447 CPVC (ASTM D1784) |
|
Seat Material Options |
EPDM, FKM (Viton) |
|
Stem/Shaft Material |
Stainless Steel 304 / 316 / Titanium (Fully Encapsulated) |
|
Flange Standard |
ANSI B16.5 Class 150 / EN 1092-1 PN10 / JIS 10K |
|
Leakage Class |
ANSI/FCI 70-2 Class VI (Zero Leakage) |
|
Actuation Interface |
ISO 5211 (F05 / F07 / F10 depending on size) |
Materials & Media Compatibility
CPVC Body & Disc: Resistant to sodium hypochlorite, sulfuric acid (up to 80%), hydrochloric acid, nitric acid mixtures, and deionized water. Unsuitable for aromatic hydrocarbons, esters, and ketones.
EPDM Seat: Recommended for water treatment, sodium hydroxide, dilute acids, and HVAC glycol loops. Operating range: -20°F to 230°F (-29°C to 110°C).
FKM (Viton) Seat: Required for concentrated acids, petroleum-based fluids, chlorinated solvents, and aggressive organic chemicals. Operating range: 0°F to 400°F (-18°C to 204°C).
Stem Protection: The drive shaft is isolated from line fluids by dual EPDM/FKM stem seals and internal disc sleeve geometry, preventing chemical attack on internal hardware.
Connection & Configuration Options
Flange Connection
Wafer body style with guide holes for alignment between ANSI 150#, PN10, or JIS 10K companion flanges.
Manual Operators
2" to 4": Lever handle with 9-position notch plate and locking tab.
6" to 12": Worm gear operator with cast aluminum housing and handwheel position indicator.
Automated Actuation Options
Pneumatic Actuator: Double-acting or Spring-Return (Fail-Safe), aluminum anodized body, Namur solenoid mounting pad.
Electric Actuator: On/Off or Modulating (4-20mA / 0-10V input), 24V DC / 110V AC / 220V AC, IP67 enclosure rating.
Application-Specific Design Considerations
Thermal Expansion: CPVC has a linear expansion coefficient higher than steel (3.8 x 10^-5 in/in/°F). Ensure expansion loops or joints are placed near valve stations in elevated-temperature lines.
Velocity Limits: Maximum recommended fluid velocity is 8 ft/sec (2.4 m/s) for liquids containing suspended solids to prevent localized seat wash-out.
Pressure De-rating: Working pressure decreases as system operating temperature increases. Always verify system thermal profile against the pressure-temperature curve prior to sizing.
CPVC Temperature De-rating Factor: 73°F (23°C): 1.00 | 110°F (43°C): 0.83 | 140°F (60°C): 0.50 | 180°F (82°C): 0.25 | 200°F (93°C): 0.20
Applications
Industrial Chemical Processing
Dosing and transfer lines for aggressive acids, bases, and process reagents.
Industrial Wastewater & Water Treatment
Hypochlorite disinfection, neutralization tanks, and reverse osmosis pre-filtration.
Metal Finishing & Electroplating
Acid pickling, anodizing solutions, and plating bath circulation lines.
Chlor-Alkali Plants
Brine filtration, chlorine cell discharge, and sodium hydroxide distribution systems.
Quality & Inspection
Hydrostatic Pressure Testing: Every valve undergoes shell testing at 1.5x working pressure (225 PSI) and seat closure testing at 1.1x working pressure per ISO 5208 standards.
Dimensional Inspection: Critical dimensions, including flange bolt circle diameters, face-to-face width (ISO 5752 series 20), and stem square drive sizes, are verified using CMM and gauge fixtures.
Material Traceability: Raw CPVC resin batch inspection includes melt flow index and density checks. Mill test reports (MTR) for metallic stems are archived per batch.
OEM / ODM & Customization
Private Labeling & Marking: Custom laser marking on body pads, cast logo integration on lever handles, and customized nameplates with specific tag numbers.
Material Customization: Special stem alloys (Titanium Grade 2, Hastelloy C-276) for extreme halide exposure.
Packaging & Kitting: Individual boxed packaging with barcode labeling, pre-assembled actuator-valve packages, and custom OEM bulk palletizing.
FAQ
Q: How does CPVC compare to PVC for butterfly valve selection?
A: CPVC supports operating temperatures up to 200°F (93°C), whereas standard PVC is limited to 140°F (60°C). CPVC also provides higher impact strength and broader chemical resistance against concentrated acids at elevated temperatures.
Q: Can this CPVC butterfly valve be installed at the end of a pipeline?
A: No. Wafer-style butterfly valves require clamping between two pipe flanges for structural support and seat sealing. End-of-line service requires a lug-style butterfly valve with threaded inserts.
Q: What flange gaskets are required for installation?
A: No separate flange gaskets are needed. The full-liner seat folds around the valve face, acting as an integrated seal against companion flat-face flanges.
Q: Is this valve compatible with metal companion flanges?
A: Yes. However, flat-face companion flanges are mandatory. Mating to raised-face metal flanges can cause uneven stress distribution and crack the plastic flange ring when torqued.
Q: What torque pattern should be used when tightening flange bolts?
A: Tighten bolts in a star (criss-cross) pattern in incremental steps (30%, 60%, 100% of target torque) using a torque wrench. Refer to the manual for specific ft-lb limits to prevent body deformation.
Q: Are spare seats and discs available for field maintenance?
A: Yes. Replacement EPDM/FKM seat liners, CPVC discs, and stem assemblies can be ordered separately for field overhaul.
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