PPH Butterfly Valve
Polypropylene Homopolymer (PPH) butterfly valves provide reliable flow control and isolation in chemical processing and industrial water systems. Engineered for high chemical resistance against concentrated acids, alkalis, and organic solvents, PPH outperforms traditional PVC in both temperature tolerance (up to 95°C / 203°F) and structural rigidity.
Description
Product Overview
Polypropylene Homopolymer (PPH) butterfly valves provide reliable flow control and isolation in chemical processing and industrial water systems. Engineered for high chemical resistance against concentrated acids, alkalis, and organic solvents, PPH outperforms traditional PVC in both temperature tolerance (up to 95°C / 203°F) and structural rigidity.
Available in wafer and lug patterns from 2" to 12" (DN50–DN300), these valves feature a drop-tight shutoff mechanism, low torque requirements, and compatibility with manual levers, worm gearboxes, pneumatic actuators, and electric actuators.
Key Product Characteristics
High Chemical Resistance: Homopolymer structure resists stress cracking when exposed to strong acids (HCl, H2SO4), caustic solutions (NaOH), and aggressive chlorination agents.
Extended Thermal Range: Maintains dimensional stability and mechanical strength at continuous operating temperatures up to 95°C (203°F).
Low Operating Torque: Precision-molded disc profiles reduce friction against the elastomeric liner, enabling smooth manual actuation and lower torque requirements for automated packages.
Bi-Directional Sealing: Symmetrical seat design maintains a bubble-tight seal in either flow direction.
Non-Contaminating Flow Path: High-purity PPH surface prevents ion leaching and scaling, making it suitable for ultrapure water (UPW) and deionized water networks.
Key Specifications
|
Parameter |
Specification / Value |
|
Size Range |
2" to 12" (DN50 – DN300) |
|
Nominal Pressure |
PN10 / 150 PSI @ 20°C (68°F) |
|
Temperature Range |
-10°C to +95°C (+14°F to +203°F) |
|
Flange Compatibility |
ANSI B16.5 Class 150 / EN1092-1 PN10 / JIS 10K |
|
Actuation Mounting |
ISO 5211 Direct-Mount Flange |
|
Body / Disc Material |
Polypropylene Homopolymer (PPH) |
|
Stem Material |
Stainless Steel 304 / 316 / Titanium (Fully Encapsulated / Dry Shaft) |
|
Seat / Liner Options |
EPDM / FPM (Viton) / PTFE-Lined EPDM |
|
Test Standards |
EN 12266-1 / ISO 5208 (Shell & Leakage Testing) |
Materials & Media Compatibility
Material Selection Guide
PPH (Polypropylene Homopolymer): Offers higher mechanical strength, tensile modulus, and thermal resistance than standard PP-R or PVC.
EPDM Seat: Recommended for water treatment, diluted acids, alkalis, and ozone. Operating range: -10°C to +90°C.
FPM (Viton) Seat: Recommended for concentrated acids, petroleum-based oils, aromatic hydrocarbons, and high-temperature chemicals. Operating range: -10°C to +95°C.
PTFE-Lined Seat: Combines the chemical inertness of PTFE on the wetted face with an EPDM elastomeric backing for high seal resilience.
Connection & Configuration Options
Body Styles
Wafer Type: Fits between standard companion flanges; lightweight and space-saving.
Lug Type: Features threaded inserts for end-of-line service and system maintenance without downstream pressure loss.
Actuation Options
Manual: Lever handle with multi-position notch plate (2"–6") or heavy-duty worm gearbox (8"–12").
Automated: ISO 5211 direct-mounting pad allows retrofit of double-acting/spring-return pneumatic actuators or 24V/110V/220V electric actuators.
Application-Specific Design Considerations
Pressure De-Rating: Working pressure decreases as temperature rises above 20°C. At 80°C, maximum allowable working pressure is reduced from 10 bar to 3.5 bar.
Thermal Expansion: PPH has a higher thermal expansion coefficient than carbon steel (approx. 1.5 x 10^-4 / K). Piping layout must account for thermal growth in hot-process lines.
Cavitation & Velocity: Recommended maximum fluid velocity is 3 m/s for liquids. Avoid throttling below 15 degrees open to prevent high-velocity cavitation erosion on the disc edge.
Applications
Industrial Chemical Processing: Acid handling, caustic transfer lines, and chemical dosing systems.
Water & Wastewater Treatment: Desalination plants, industrial effluent treatment, and municipal water purification.
Surface Finishing & Electroplating: Pickling tanks, etching lines, and acid recovery units.
Semiconductor & Electronics: High-purity fluid handling and deionized water distribution networks.
Aquacultural Engineering: Recirculating aquaculture systems (RAS) sensitive to metallic contamination.
Quality & Inspection
Each batch undergoes strict quality control procedures before shipment:
Raw Material Inspection
MFI (Melt Flow Index) testing and density verification on virgin PPH resin.
Dimensional Verification
CMM inspection of disc profile, shaft bore alignment, and flange hole PCD tolerances.
Pressure & Leakage Testing
Shell Hydrostatic Test: 1.5x PN (15 bar / 225 PSI) for 60 seconds.
Seat Closure Test: 1.1x PN (11 bar / 165 PSI) pneumatic/hydrostatic test; zero visible leakage (ISO 5208 Rate A).
Torque Validation
Verification of breakout torque to ensure proper motor sizing for automated valves.
OEM / ODM & Customization
We support custom engineering requirements for global distributors and system integrators:
Custom Tagging & Marking: Laser-etched stainless steel nameplates, custom body color options, and private label branding.
Specialized Shaft Materials: Duplex stainless steel, Hastelloy C-276, or Titanium stems for extreme media applications.
Pre-Assembled Valve Packages: Factory assembly and testing of valves fitted with customer-specified pneumatic/electric actuators, limit switch boxes, and electro-pneumatic positioners.
FAQ
Q: What is the main difference between PPH and PVC butterfly valves?
A: PPH offers superior thermal resistance (up to 95°C vs. PVC's 60°C) and higher impact resistance at elevated temperatures. PPH also exhibits better resistance to organic solvents and stress cracking in aggressive chemical environments.
Q: Is the shaft in direct contact with the process fluid?
A: No. The stem features a dry-shaft design. Double O-ring seals and an encapsulated disc hub isolate the metallic shaft completely from the wetted flow path, preventing media contamination and shaft corrosion.
Q: How do I select between EPDM and FPM seat materials?
A: Use EPDM for water, dilute acids, alkalis, and general chemical applications under 90°C. Select FPM (Viton) when handling concentrated acids, oils, fuel, or halogenated hydrocarbons up to 95°C.
Q: Can this valve be used for throttling applications?
A: Yes. Manual lever versions include a multi-position notch plate for flow regulation. However, continuous operation between 0° and 15° open is not recommended due to high-velocity flow turbulence and localized seat wear.
Q: Can I mount my own actuator on this valve?
A: Yes. The valve top flange complies with ISO 5211 dimensions. You can mount standard pneumatic or electric actuators directly or via a standard bracket and coupling.
Q: What pressure rating applies at maximum operating temperature?
A: At the maximum continuous temperature of 95°C, the allowable working pressure de-rates to 2 bar (30 PSI). Always consult the temperature/pressure de-rating chart prior to final system specification.
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