High-performance Valves With Enhanced Sealing And Low Torque
Double offset soft seated butterfly valve ensures precise flow control and tight shut-off in industrial pipelines, offering corrosion resistance and low torque operation.
High-performance Valves With Enhanced Sealing And Low Torque
Double offset soft seated butterfly valve ensures precise flow control and tight shut-off in industrial pipelines, offering corrosion resistance and low torque operation. ideal for water, oil, and gas systems, it provides reliable performance up to 300 psi.
A Double Offset Butterfly Valve, also called a "double eccentric" valve, is a high-performance valve designed for tight shut-off and long service life in demanding applications. It achieves this with two offsets: the shaft is positioned behind the centerline of the disc, and the disc is offset from the shaft. This double offset creates a camming action, lifting the disc from the seat as it opens and preventing wear and seat compression, leading to zero-leakage performance in high-pressure, high-temperature, and even vacuum conditions
SIZE: 48″
RATING: 300LB
ASTM A216 WCB
Ball: ASTM A182 F316
Stem: ASTM A182 F316
Seat: ASTM A182 F316 collar with DEVLON insert
Spring: INCONEL
X-750
Pneumatic Actuator
Sealing Structure: Soft seal for pure
medium, metal seal for medium with solids
Safety Design: Fire safe
(API607), anti-static & anti-blowout stem, DBB function
Inspection:
API598, API6D
Double Offset Soft Seated Butterfly Valve is a high-performance valve designed for precise flow control and reliable shut-off in industrial piping systems. Compliant with standards like API 609, ASME B16.34, and EN 593, these industrial butterfly valves are constructed from materials such as ductile iron (ASTM A536), stainless steel (AISI 316/304), or carbon steel (WCB), offering exceptional corrosion resistant butterfly valve properties. Widely used in water treatment, oil and gas, chemical processing, and HVAC systems, they provide efficient pipeline flow control under pressures up to 300 PSI and temperatures ranging from -29°C to 150°C, ensuring durability and performance in diverse environments.
Manufactured through precision casting or forging, the double offset soft seated butterfly valve features a unique double eccentric design, with the disc offset from the valve centerline in two directions, reducing seat wear and torque requirements. Available in sizes from 2" to 48" (DN50 to DN1200), they support wafer, lug, or double flanged connections per ASME B16.5 or EN 1092. The soft seats, typically made of EPDM, NBR, or PTFE, provide bubble-tight sealing, ideal for applications requiring chemical compatibility and zero leakage. Surface treatments like epoxy coating or nickel plating enhance corrosion resistance, making these valves suitable for water, oil, gas, and mildly corrosive media in soft seated butterfly valve applications.
Double Offset Soft Seated Butterfly Valves undergo rigorous testing, including hydrostatic, leakage, and cycle tests, to comply with API 598, API 6D, and EN 12266 standards. With a minimum tensile strength of 485 MPa and yield strength of 275 MPa for ductile iron, these valves ensure structural integrity in demanding conditions. The double offset design minimizes disc-to-seat contact, extending seat life and enabling smooth operation with low torque, ideal for frequent cycling applications. Features like anti-blowout stems, ISO 5211 mounting pads, and bidirectional sealing enhance safety and compatibility with pneumatic or electric actuators, supporting automation in high-performance butterfly valve systems.
Compared to concentric or triple offset butterfly valves, the double offset soft seated butterfly valve offers a balance of tight sealing, reduced wear, and cost-effectiveness, making it ideal for medium-pressure systems. Certified by WRAS for potable water and API 609 for performance, these valves are designed for long service life, with replaceable seats for easy maintenance. Their compact design and low weight make them suitable for large-diameter pipelines, while fire-safe options meeting API 607 standards cater to high-risk applications. The valves’ versatility extends to handling abrasive fluids with caution, as soft seats may require replacement in such conditions.
Addressing challenges like pipeline leaks, corrosion, and frequent maintenance, Double Offset Soft Seated Butterfly Valves deliver reliable, efficient solutions for industrial piping systems. Their corrosion-resistant materials, low-torque operation, and superior sealing make them a preferred choice for engineers seeking durable high-performance butterfly valves. Backed by Sunny Steel’s white-glove service, these valves ensure exceptional performance, safety, and longevity in water treatment, oil and gas, and HVAC applications.
| Organization | Standard | Description |
|---|---|---|
| ANSI | American National Standards Institute | General industrial standards |
| API | American Petroleum Institute | Standards for oil and gas industry |
| ASME | American Society of Mechanical Engineers | Boiler and pressure vessel codes |
| BS | British Standards | UK national standards |
| GB, JB, HG | China Valve Standards | Chinese national and industry standards |
Upstream, midstream, and downstream operations, including drilling, refining, and transportation.
Handling corrosive and hazardous chemicals in various chemical plants.
Steam, water, and fuel systems in thermal, nuclear, and hydroelectric plants.
Municipal water supply, wastewater treatment, and industrial water management.
Heating, ventilation, and air conditioning systems in commercial and industrial buildings.
Sterile and hygienic applications, precise flow control in sensitive industries.
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