A double flanged butterfly valve with vulcanized rubber seat is a quarter-turn rotary valve engineered for critical isolation/regulation in pipelines. Its vulcanized elastomeric seat delivers zero leakage (ISO 5208 Class A) while double flanges (ASME B16.5/EN 1092-1) ensure rigid, leak-free piping connections. Widely used in water, HVAC, and fire safety systems.
l Bubble-Tight Shutoff
Vulcanized rubber seat (EPDM/NBR/FKM) chemically bonded to valve body during manufacturing.
Achieves zero measurable leakage per ISO 5208 Rate A standards.
Resilient seal compensates for minor disk imperfections.
l Robust Flange Design
Double flanged ends (Class 125/150) simplify bolting between pipeline flanges.
Complies with ASME B16.5, EN 1092-1, and AWWA C504 standards.
Eliminates gasket misalignment vs. wafer-style valves.
l Low Operating Torque
30% lower torque than metal-seated valves → smaller actuators = cost savings.
Smooth 90° operation reduces wear.
Body: Ductile iron (epoxy-coated), SS316, or carbon steel.
Seat options:
Material | Temperature Range | Key Applications |
EPDM | -20°C to 120°C | Water, steam, chemicals |
NBR | -10°C to 80°C | Oils, fuels, gas |
FKM | -15°C to 180°C | Aggressive chemicals, high temp |
Water & Wastewater: Pump discharge, filtration, distribution (EPDM seats).
Fire Protection: UL/FM-approved sprinkler systems (AWWA C504 compliant).
HVAC: Chilled water, cooling towers (EPDM).
Industrial:Chemical processing (FKM), food/beverage (FDA-grade EPDM).
l 15+ Years Manufacturing Expertise
l ISO 9001 Certified Production
l 24hr Technical Support
l Global Shipping (FOB/CIF)
For zero-leakage, high-quality double flanged vulcanized rubber seat butterfly valves, Contact Us.
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