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Double Flanged Double Offset Butterfly Valve China Manufacturer

From a China manufacturer, I present a robust Double Flanged Double Offset Butterfly Valve designed for critical pipelines. The double-offset geometry eliminates seat rubbing, delivering long life and reliable shut-off under heavy service. It's suitable for water, oil, gas and chemicals, and available in stainless steel, ductile iron, and high-strength alloys. The flange connections meet ANSI/ISO standards, and the trim is customizable to your process. I focused on low torque operation, easy installation and maintenance, and corrosion resistance. This valve features fire-safe seals, bolted bonnet, and various trim options. I can offer competitive bulk pricing, fast lead times, and OEM/ODM support for distributors and project buyers. If you’re sourcing in China, you’ll appreciate the consistent quality, traceable materials, and export-ready documentation I provide as a manufacturer.

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Double Flanged Double Offset Butterfly Valve Products Factory

As a dedicated manufacturer of double flanged double offset butterfly valves, our factory focuses on delivering robust, low-torque isolation solutions engineered for tight shut-off and long service life. The double-offset geometry minimizes seat wear and provides metal-to-metal or resilient sealing options across a wide range of sizes and pressure classes. Materials and finishes include carbon steel, stainless steels, duplex alloys and specialty coatings suitable for oil & gas, petrochemical, power, water treatment, HVAC and marine applications. Valves are available with manual, pneumatic or electric actuation, and can be tailored with fire-safe design, anti-blowout stems, and special linings for abrasive or corrosive media. Global buyers benefit from high production capacity, rigorous quality control to international standards (API/ISO/EN), full pressure and leakage testing, non-destructive inspection and batch traceability. We support project sourcing with engineering review, rapid prototyping, OEM packaging and competitive lead times for bulk orders. Export-ready packaging, spare-part kits and aftermarket support ensure reliable operation in field conditions. For turnkey procurement or specification assistance, technical quotations and custom configurations are readily provided to meet global project schedules and performance requirements.

{ Double Flanged Double Offset Butterfly Valve Products Factory}
Model Valve Type Nominal Diameter (DN, mm) Face-to-Face (mm) Pressure Rating Body Material Disc Material Seat Material Shaft Material End Connection Actuation Leakage Standard Operating Temp Range (°C) Notes
DFDOV-050-10 Double Offset Butterfly 50 68 PN10 Ductile Iron (epoxy-coated) 316 Stainless Steel EPDM 17-4 PH Stainless Double Flanged PN10 Manual Lever / Gear EN 12266-1 Rate A -20 to +120 General water and utility services
DFDOV-080-16 Double Offset Butterfly 80 78 PN16 Carbon Steel (WCB) with primer 316 Stainless Steel NBR 420 Stainless Steel Double Flanged PN16 Gear Operator EN 12266-1 Rate A -20 to +120 Suitable for oil & low-viscosity fluids
DFDOV-100-16 Double Offset Butterfly 100 102 PN16 Cast Stainless (CF8M) 316 Stainless Steel PTFE (full-lip) 316 Stainless Steel Double Flanged PN16 Electric Actuator EN 12266-1 Rate B -20 to +200 Chemical service, low-permeability seat
DFDOV-150-16 Double Offset Butterfly 150 125 PN16 Carbon Steel (WCB) Duplex Stainless Steel PTFE (reinforced) 17-4 PH Stainless Double Flanged PN16 Pneumatic Actuator EN 12266-1 Rate B -20 to +220 High-cycle industrial applications
DFDOV-200-10 Double Offset Butterfly 200 140 PN10 Ductile Iron (coated) Aluminum Bronze PTFE-faced resilient 316 Stainless Steel Double Flanged PN10 Gear Operator EN 12266-1 Rate A -29 to +180 HVAC, water treatment and seawater service
DFDOV-250-16 Double Offset Butterfly 250 152 PN16 Cast Stainless (CF8M) Duplex Stainless Steel PTFE 316 Stainless Steel Double Flanged PN16 Electric Actuator EN 12266-1 Rate B -20 to +200 Petrochemical pipelines and services
DFDOV-300-25 Double Offset Butterfly (metal seat) 300 165 PN25 Carbon Steel (WCB) 316L Stainless Steel Metal (stainless) sealing 17-4 PH Stainless Double Flanged PN25 Hydraulic / Special Actuation EN 12266-1 Rate C +50 to +450 High-temperature steam and thermal fluids
DFDOV-400-16 Double Offset Butterfly 400 200 PN16 Carbon Steel (WCB) 316 Stainless Steel PTFE 318 Stainless Steel Double Flanged PN16 Gear Operator EN 12266-1 Rate B -20 to +200 Large bore industrial installations
Notes: Face-to-face values are representative typical dimensions; final specifications follow applicable standards and project requirements.

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Double Flanged Double Offset Butterfly Valve Sets the Industry Standard Your Trusted OEM Partner

Performance Metrics Across Valve Sizes: Efficiency, Torque, and Leakage Trends

This chart presents a concise comparative analysis of three critical performance metrics across common double-flanged, double-offset butterfly valve sizes: flow efficiency, required actuation torque, and leakage rate. Flow efficiency (left axis) generally improves from small to medium sizes, peaking around the 8" valve where the offset geometry and disc-to-seat interaction commonly yield optimal hydraulic performance. Larger diameters show a modest decline in percentage efficiency due to scale effects, boundary layer changes, and increased potential for flow disturbances. Actuation torque (right axis) rises sharply with size because larger discs create greater moment arms and friction at seals grows with sealing contact area; this necessitates progressively stronger actuators or gearbox ratios for larger valves. Leakage rate (right axis, dashed line) is lowest near mid-range sizes where sealing design most effectively balances contact pressure and surface conformity; at very small sizes minor machining tolerances and at very large sizes alignment and seat deformation can elevate leakage. Interpreting these trends together helps engineers and procurement teams optimize valve selection: mid-range sizes often offer the best compromise between high efficiency, manageable torque, and minimal leakage, while very large valves require careful actuator specification and periodic maintenance to preserve sealing performance. Use this aggregated view to prioritize design changes, actuator sizing rules, and maintenance intervals when integrating double-offset butterfly valves into piping systems.

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  • Sally 2022.12.15 11:53:10

    We have worked with many companies, but this time is the best，detailed explanation, timely delivery and quality qualified, nice!

  • Alexander 2022.11.07 06:51:47

    The customer service staff is very patient and has a positive and progressive attitude to our interest, so that we can have a comprehensive understanding of the product and finally we reached an agreement, thanks!

  • Renee 2022.10.07 15:25:20

    The company can think what our think, the urgency of urgency to act in the interests of our position, can be said this is a responsible company, we had a happy cooperation!

  • Elaine 2022.10.06 06:59:24

    The company has a good reputation in this industry, and finally it tured out that choose them is a good choice.

  • Sandra 2022.09.16 12:51:50

    Factory equipment is advanced in the industry and the product is fine workmanship, moreover the price is very cheap, value for money!

  • Elizabeth 2022.06.15 01:40:55

    Hope that the company could stick to the enterprise spirit of "Quality, Efficiency, Innovation and Integrity", it will be better and better in the future.

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