As a core fluid control component in the printing and dyeing industry, the double offset butterfly valve, independently developed and manufactured by Koreyda, is tailored to the harsh operating conditions of this sector. Printing and dyeing processes involve frequent handling of high-temperature steam, corrosive dyes, chemical auxiliaries, and circulating water, requiring valves to possess excellent sealing performance, corrosion resistance, temperature adaptability, and reliable regulatory capabilities.
Get a Free QuoteDouble Offset Structural Design Advantages
The core highlight of Koreyda's double offset butterfly valve lies in its sophisticated double eccentric structure, where the valve stem axis deviates from both the seat centerline and the butterfly plate center. This design delivers multiple performance upgrades compared to ordinary butterfly valves, perfectly matching the printing and dyeing industry's requirements for frequent opening and closing and stable operation:
Reduced Friction & Extended Service Life: When the valve is opened, the butterfly plate quickly disengages from the seat, reducing friction between the sealing surfaces by over 70% compared to conventional valves. This minimizes wear on the seat and butterfly plate, ensuring stable operation for tens of thousands of cycles without damage, adapting to the high-frequency switching demands of dyeing machines and auxiliary delivery pipelines.
Low Operating Torque & Energy Saving: The double offset design optimizes the force mechanism during valve operation, significantly reducing opening and closing torque. For DN600 valves, the electric actuation torque is ≤ 350 N·m, reducing energy consumption by 25% compared to similar products. It can be easily driven by manual, pneumatic, or electric actuators, suitable for automated production lines in printing and dyeing workshops.
Excellent Flow Regulation Performance: The streamlined butterfly plate and large flow channel design result in a flow resistance coefficient as low as 0.1, ensuring unobstructed flow of dye solutions and steam, avoiding fluid stagnation and energy loss. The flow characteristic curve is approximately linear, enabling precise adjustment of medium flow and pressure to meet the strict process requirements of dyeing temperature and concentration control.
Sealing Performance & Maintenance Convenience
Sealing reliability is crucial in printing and dyeing production to prevent dye cross-contamination and steam leakage. Koreyda's double offset butterfly valve adopts a bidirectional elastic sealing structure with an elastic energizing ring inside the seat, which automatically compensates for wear and temperature changes to maintain stable sealing performance. The valve seat and flange surface are sealed with an integrated O-ring, eliminating the need for additional gaskets and avoiding leakage points.
In terms of maintenance, the valve adopts a split body design and a detachable seat structure. The seat can be replaced on-site by removing the gland without disassembling the butterfly plate and valve stem, greatly reducing maintenance time and labor costs. This design is particularly suitable for printing and dyeing workshops where production downtime needs to be minimized.
Drive & Control Adaptability
To meet the automated control needs of modern printing and dyeing production lines, Koreyda's double offset butterfly valve supports multiple drive modes:
Pneumatic Drive: Equipped with AT/GT series cylinders, available in double-acting and single-acting (spring return) types, with a response time of ≤ 1.5 seconds, suitable for fast switching scenarios such as dyeing machine feeding and discharging.
- Electric Drive: Configured with intelligent electric actuators, supporting on-off control, proportional adjustment, and three-stage positioning, enabling precise control of flow and pressure, and compatible with remote control systems in printing and dyeing workshops.
Manual Drive: Equipped with a worm gear mechanism for small-diameter valves in non-automated sections, featuring labor-saving operation and a locking device to fix the opening position.
Technical Specifications & Application Scenarios
The valve complies with GB/T 12238, API 609, and EN 593 standards, with the following key technical parameters:
Nominal Diameter: DN50 ~ DN1200mm
Nominal Pressure: PN6 ~ PN40bar
Medium Temperature: -40℃ ~ 350℃ (depending on material combination)
Connection Method: Wafer type, lug type, flange type
Leakage Rate: EN 12266-1 Rate A (zero leakage for RT FE seat)
Typical application scenarios in the printing and dyeing industry include: dye and chemical auxiliary delivery pipelines, high-temperature steam control for dyeing machines, circulating water systems, wastewater treatment and discharge links, and pre-treatment equipment such as desizing and bleaching tanks. It effectively ensures the stability of dye color, reduces energy consumption of steam and water, and achieves green and efficient production.
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