Compact chemical reactors, pharmaceutical sterile workshops, and fine chemical production lines require valves to save space while meeting strict sealing and corrosion resistance requirements. Koreyda’s double offset butterfly valves, with PTFE or alloy steel seats, adapt to various corrosive media (acids, alkalis, organic solvents) and can be integrated with automated actuators for precise flow control. Their modular design allows maintenance without removing the valve body, suitable for clean rooms and narrow production areas.
Get a Free QuoteDouble Offset Structural Design Advantages
The core advantage of Koreyda's double offset butterfly valve lies in its sophisticated double eccentric structure (axial and radial eccentricity), where the valve stem axis deviates from both the seat centerline and the butterfly plate center. This design achieves targeted performance upgrades for chemical and pharmaceutical scenarios, addressing industry-specific challenges:
Corrosion & Wear Resistance Enhancement: When opening, the butterfly plate quickly disengages from the seat, reducing sealing surface friction by over 70% compared to conventional valves. This minimizes wear caused by corrosive media scouring and particulate matter, avoiding seal failure and medium leakage, ensuring stable operation for over 30,000 cycles—critical for continuous chemical production and batch pharmaceutical processing.
Low Torque & Explosion-Proof Adaptability: The optimized eccentric structure significantly reduces opening/closing torque (electric actuation torque ≤350 N·m for DN600 valves), enabling flexible matching with explosion-proof actuators. It avoids torque overload under high-pressure (PN40) and viscous medium conditions, ensuring safe operation in flammable and explosive chemical workshops.
Sterile & Low-Dead-Volume Design: The streamlined butterfly plate and full-bore flow channel minimize dead volume, eliminating medium retention areas that are difficult to clean. The structure meets GMP requirements for "no dead corners," preventing cross-contamination between batches in pharmaceutical production while ensuring uniform flow of viscous chemical media.
Sealing Performance & Maintenance Convenience
Sealing reliability is critical for preventing corrosive medium leakage (chemical industry) and cross-contamination (pharmaceutical industry). Koreyda's double offset butterfly valve adopts a bidirectional elastic sealing structure, integrated with a food-grade sealing element and a bellows isolation system. For pharmaceuticals, the seal achieves bubble-tight leakage (EN 12266-1 Rate A) and is compatible with CIP (Clean-in-Place) and SIP (Sterilize-in-Place) processes, withstanding 134℃ high-temperature sterilization. For chemicals, the seal resists swelling and degradation from organic solvents, ensuring long-term sealing stability under alternating temperature and pressure conditions (-20℃~180℃).
Optimized for batch production and frequent maintenance, the valve features a split-body and quick-release seat design. The seat and sealing elements can be replaced on-site without disassembling the pipeline, reducing downtime for pharmaceutical batch switching and chemical medium replacement. The electropolished surface (Ra≤0.38μm) has no residual media, meeting GMP cleaning verification requirements, and the valve body is designed with drainage holes to avoid liquid accumulation and bacterial growth.
Drive & Control Adaptability
To match the automated control, explosion-proof, and sterile requirements of chemical and pharmaceutical production systems, Koreyda's double offset butterfly valve supports multi-drive modes with industry-specific upgrades:
Pneumatic Drive: Equipped with Ex d IIC T6 explosion-proof cylinders (suitable for flammable solvent workshops), available in double-acting and spring-return (fail-safe) types. Equipped with a smart positioner with 4-20mA signal output, achieving precise flow regulation for chemical reaction process control, with response time ≤1.8 seconds.
Electric Drive: Configured with SIL3-certified explosion-proof electric actuators, supporting on-off control, proportional adjustment, and real-time monitoring of valve position and torque. Compatible with DCS and SCADA systems for remote control and data traceability, meeting pharmaceutical production traceability requirements, and featuring IP67 protection for humid workshop environments.
Manual Drive: Equipped with a self-locking worm gear mechanism with a torque limiter for small-diameter auxiliary pipelines (e.g., pharmaceutical reagent addition). The detachable handwheel with a locking device prevents misoperation, and the surface is electropolished to meet sterile workshop standards.
Technical Specifications & Application Scenarios
The valve complies with GB/T 12238, API 609, EN 593, FDA 21 CFR Part 177, and GMP standards, optimized for chemical and pharmaceutical industries with key parameters:
Nominal Diameter: DN50 ~ DN1500mm
Nominal Pressure: PN10 ~ PN40bar (adapts to chemical high-pressure reaction systems)
Medium Temperature: -20℃ ~ 180℃ (covers CIP/SIP and high-temperature chemical processes)
Connection Method: Wafer type, flange type, clamp type (electrolytic polishing, Ra≤0.38μm)
Leakage Rate: EN 12266-1 Rate A (bubble-tight); sterile grade zero leakage for pharmaceuticals
Surface Treatment: Electrolytic polishing, passivation, anti-static coating (for chemical solvent systems)
Typical application scenarios include: chemical industry - reaction kettles, solvent recovery pipelines, acid/alkali storage and transportation, chemical wastewater treatment; pharmaceutical industry - API synthesis lines, sterile water systems, buffer solution preparation, CIP/SIP cleaning circuits, and reagent delivery pipelines. It effectively prevents corrosive leakage and cross-contamination, ensures compliance with regulatory requirements, and supports efficient and stable production in both industries.
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