The soft seated double offset butterfly valve is a quarter-turn isolation valve designed for water treatment, wastewater, HVAC, industrial utilities, chemical processing, and marine applications requiring tight shutoff and reliable performance.
Key Features
Double Offset Kinematics: Disc disengages from the seat during initial opening, reducing seat friction, wear, and operating resistance.
Zero-Leakage Sealing: Precision-molded resilient seats deliver bubble-tight isolation across pressure ranges.
Actuation-Ready Design: Top flange built to ISO 5211 standard for seamless integration with manual gears, electric actuators, or pneumatic actuators.
Global Flange Compatibility: Manufactured to fit EN, DIN, ANSI, ISO, JIS, and AWWA flange dimensions.
Heavy-Duty Construction: Rugged body and stem designs suited for large-diameter and high-cycle pipelines.
Technical Specifications
|
Parameter |
Options / Standard Range |
|
Valve Type |
Soft Seated Double Offset / Double Eccentric Butterfly Valve |
|
Function |
Quarter-Turn Pipeline Isolation & Tight Shutoff |
|
Size Range |
DN50 to DN2400 (2 inches to 96 inches) |
|
Pressure Ratings |
PN10, PN16, PN25, PN40 / Class 150, Class 300 |
|
Design Standards |
EN 593, API 609, MSS SP-67, BS 5155 |
|
Testing Standards |
API 598, ISO 5208, EN 12266-1 |
|
Face-to-Face Standards |
ISO 5752, EN 558, API 609, DIN 3202 |
|
Actuator Mounting |
ISO 5211 Direct Pad |
|
Flange Drilling |
EN 1092-2, ANSI B16.5, ISO 7005, JIS B2220, AWWA C207 |
|
Body Materials |
Ductile Iron (GGG40/50), Carbon Steel (WCB), Stainless Steel (CF8/CF8M) |
|
Disc Materials |
Ductile Iron (Epoxy/Ni-Plated), CF8, CF8M, Duplex Stainless Steel |
|
Stem Materials |
SS410, SS420, SS316, 17-4PH Stainless Steel |
|
Seat Materials |
EPDM, NBR, PTFE, FKM |
Seat Material Selection Guide
Selecting the appropriate elastomer seat is critical to ensuring operational safety and maximizing valve lifespan.
|
Material |
Suitable Media & Applications |
Temp. Range |
Selection Considerations |
|
EPDM |
Potable water, raw water, HVAC, treated effluent |
-20°C to +120°C |
Excellent weather/ozone resistance; unsuitable for oils. |
|
NBR |
Crude oil, petroleum, hydrocarbons, compressed air |
-10°C to +80°C |
High resistance to oils and fuels; limited weather resistance. |
|
PTFE |
Acids, alkalis, aggressive chemical media |
-20°C to +180°C |
Superior chemical inertness and low friction coefficient. |
|
FKM |
High-temperature oils, solvents, process chemicals |
-10°C to +200°C |
Excellent heat and chemical resistance for severe service. |
Quality Assurance & Testing
In-House Processing: Strict dimensional control over seat vulcanization and CNC stem machining.
100% Factory Inspection: Pressure testing, shell integrity testing, and seat leakage inspection performed per API 598 or ISO 5208 before shipment.
Traceability: Full material test certificates (MTC per EN 10204 3.1) available upon request.
Applications
Water Supply & Treatment: Raw water intake, pumping stations, distribution networks, and desalination systems.
Wastewater & Municipal: Sewage treatment plants and industrial effluent piping.
HVAC & Building Services: Chilled water loops, cooling towers, and boiler feed utilities.
Industrial & Chemical: Process piping, chemical drainage, and utility isolation lines.
RFQ & Customization Checklist
To receive an accurate technical proposal and quotation within 24 hours, please provide the following details:
Nominal Diameter (DN/Inches) & Pressure Class (PN/Class)
Pipeline Medium, Concentration, and Operating Temperature Range
Preferred Seat, Body, Disc, and Stem Materials
Flange Connection Standard (e.g., ANSI Class 150, EN 1092-2 PN16)
Operation Type (Bare Shaft, Manual Gear, Pneumatic, Electric)
Required Inspection Certificates or Project Standards
FAQ
Q: What is the primary advantage of a double offset butterfly valve over a concentric design?
A: The stem of a double offset butterfly valve is offset from both the pipe centerline and the sealing plane. This geometry allows the disc to disengage from the seat immediately upon opening, minimizing continuous sliding contact.
Q: How do I determine the correct seat material for my application?
A: Seat selection depends on the fluid composition, temperature, and pressure. EPDM is standard for water and HVAC applications, NBR is ideal for oil and hydrocarbon media.
Q: Can this valve be automated with electric or pneumatic actuators?
A: Yes. The valve comes equipped with a standardized ISO 5211 mounting pad, allowing easy direct mounting of pneumatic actuators, electric actuators, or manual worm gearboxes without requiring custom brackets.
Q: Are these valves compliant with international pressure and testing standards?
A: Yes. Our valves are designed in accordance with EN 593, API 609, and MSS SP-67, and are 100% pressure-tested to API 598, ISO 5208, or EN 12266-1 standards prior to delivery.
Q: Can you supply valves that match existing replacement dimensions?
A: Yes. We offer standard face-to-face dimensions conforming to ISO 5752, EN 558, and API 609. By confirming your current flange drilling, face-to-face dimensions, and pressure class, we can supply a direct replacement valve for existing piping systems.
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