The wafer-style resilient seated butterfly valve provides compact, quarter-turn flow isolation and throttling control across industrial piping, water treatment facilities, and HVAC systems. Positioned between standard pipeline flanges using through-bolts, this streamlined design minimizes space requirements and installation weight. Featuring an eccentric or concentric resilient liner and a precision-machined disc, the valve achieves bubble-tight shut-off while optimizing flow coefficients and reducing overall system energy loss.
Technical Specifications
|
Parameter |
Specification Details |
|
Size Range |
DN50 to DN1000 (2 inches to 40 inches) |
|
Pressure Ratings |
PN10 / PN16 / Class 150 LB |
|
Body Material |
Ductile Iron (ASTM A536) or Cast Iron (ASTM A126 Class B) |
|
Disc Material |
Ductile Iron (Nylon/Nickel Plated), Stainless Steel (CF8/CF8M), Aluminum Bronze |
|
Liner (Seat) Material |
EPDM, NBR, Viton (FKM), or PTFE |
|
Stem Material |
Stainless Steel (AISI 410 / AISI 304 / AISI 316) |
|
Flange Compatibility |
PN10, PN16, EN 1092-2, ASME B16.5, JIS B2220 |
|
Face-to-Face Standard |
ISO 5752 Series 20, EN 558 Series 20, API 609 Table 1 |
|
Top Flange Mounting |
ISO 5211 Direct Mounting Pad for Actuators |
Key Features
Zero-Leakage Resilient Seat: The molded elastomer liner features an integral O-ring flange seal that eliminates the need for separate gasket seals during pipe installation.
Streamlined Disc Profile: Polished hydrodynamic disc contour reduces flow turbulence, lowering pressure drop and minimizing dynamic torque requirements.
Pinless or Wet-Stem Protected Design: High-strength stem fixation prevents media contact with internal fasteners, eliminating crevice corrosion and leakage risks at the pin connection.
ISO 5211 Direct Top Flange: Universal actuator mounting pad allows immediate integration of manual gear operators, pneumatic actuators, or electric motors without requiring transition brackets.
Replaceable Liner Configuration: Cartridge or vulcanized liner designs allow seat replacement during scheduled plant maintenance, extending body service life.
Applications
Municipal Water Treatment: Potable water networks, filtration skids, and wastewater treatment aeration lines.
HVAC Mechanical Rooms: Chilled water loops, condenser lines, and cooling tower isolation systems.
Industrial Utility Lines: General plant water supply, compressed air headers, and low-corrosion chemical fluid transfer.
Marine & Shipbuilding: Seawater cooling circuits and ballast water management piping (when paired with aluminum bronze or stainless steel trim).
Manufacturing Capability & Customization (OEM/ODM)
Our manufacturing plant utilizes automated CNC lathe turning centers, precision elastomer vulcanization presses, and automated pressure testing benches designed for high-volume valve production.
Custom Material Trims: Disc and stem metallurgy custom-matched to specific chemical compatibility or offshore marine requirements.
Actuator Integration: Factory-calibrated electric and pneumatic actuators mounted, stroke-tested, and shipped as fully integrated control assemblies.
Surface Protection: Fusion Bonded Epoxy (FBE) or multi-layer polyurethane exterior coatings applied at 200+ microns for heavy industrial and chemical environment defense.
Traceability & Inspection: Individual serial tracking and material test certificates (MTR) provided per production lot.
Testing, Quality & Documentation
Every wafer butterfly valve undergoes performance verification before dispatch, complying strictly with API 598 and EN 12266-1:
Shell Strength Test: 1.5x rated working pressure using water to confirm structural body integrity.
Seat Sealing Test: 1.1x rated working pressure testing bidirectional seat leakage resistance against precision elastomer tolerances.
Operational Torque Test: Verifies smooth 90-degree quarter-turn operation and seating alignment.
Documentation Packets: Supplied with material test reports, dimensional inspection sheets, and pressure test verification certificates.
FAQ
Q: Can a wafer butterfly valve be used for flow throttling, or is it strictly for on-off isolation?
A: While primarily designed for on-off isolation, resilient seated butterfly valves can be used for throttling between 20° and 70° open positions. Continuous operation below 20° open under high flow velocities is discouraged to prevent disc flutter and premature seat wear.
Q: Are additional flange gaskets required when installing wafer-style valves?
A: No. The integrated resilient liner extends across the raised face of the valve body, serving as a built-in gasket when clamped between mating pipe flanges.
Q: How do I select between EPDM, NBR, and Viton seat liners?
A: EPDM is standard for water, HVAC, and mild chemicals (-10°C to 120°C). NBR is chosen for oil, petroleum, and hydrocarbon-infused water. Viton (FKM) is specified for high-temperature or aggressive chemical applications.
Q: Can this valve be fitted with an electric actuator later?
A: Yes. The standardized ISO 5211 top flange allows direct mounting of pneumatic or electric actuators without modifying the existing valve stem or body.
Request a Quote
Need project-specific torque calculations, custom elastomer compounds, or volume pricing? Submit your technical parameters to our engineering team for a rapid evaluation.
Required Data for Fast Response: Size, Quantity, Pressure Rating (PN/Class), Disc/Seat Material, and Actuation Type (Lever, Gearbox, or Motorized).
[ Request a Quote / Contact Engineering Team ]
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