Zero leakage Triple Offset Butterfly Valve Description
The triple-offset butterfly valve with zero leakage embodies its core features in three "offsets". Specifically, these three offsets are: the rotation centerline of the valve stem is offset from the centerline of the valve seat by a certain distance, forming the first offset; the rotation centerline of the valve stem is offset from the centerline of the valve body by a certain distance, constituting the second offset; and the centerline of the valve body is offset from the centerline of the conical sealing surface of the valve seat at a certain angle, forming the crucial third offset. This ingenious triple-offset design ensures that during valve opening or closing, the sealing ring of the butterfly valve can quickly disengage from or contact the valve seat, significantly reducing friction and wear between the sealing pairs, thereby markedly enhancing the valve's service life and sealing performance.
Zero leakage Triple Offset Butterfly Valve Specification
Design Standard: API609
Size Range: NPS1/2''-42'' (DN10-DN1200)
Pressure Rating: 150-600LB
End Connection: Wafer, Lug, Double flange
Operation: Lever, Gear, Electric, Pneumatic actuator
Performance Characteristics
1. Superior Sealing Performance
The triple-offset structure ensures uniform contact pressure between the disc and seat, eliminating localized overpressure-induced leakage to achieve "zero leakage" sealing, suitable for high-pressure and extreme-temperature conditions.
Metal-to-metal sealing (e.g., stainless steel seat + hard alloy sealing surface) offers exceptional wear resistance, maintaining shape integrity over long-term operation.
2. High-Temperature and High-Pressure Resistance
Wide temperature range (-196℃ to 650℃) and high-pressure ratings (PN10-PN160, ANSI CL150~CL900), meeting stringent demands in industries like petrochemicals and power generation.
3. Excellent Fluid Control Capability
Optimized flow path design minimizes fluid resistance, enabling high flow rates, ideal for large-diameter pipelines (DN≥1000).
Precise regulation with a control ratio of up to 100:1, allowing accurate flow adjustment from 0° opening.
4. Extended Service Life
Instantaneous separation between seat and sealing ring during opening eliminates friction, drastically reducing wear.
Truss-structured disc ensures high strength, large flow area, and low resistance.
5. User-Friendly Operation
70-90° valve stem rotation for quick on/off operation.
Compatible with multiple drives: manual, worm gear, pneumatic, electric, and hydraulic.
6. Safety and Reliability
Dual safety features (e.g., independent thrust rings) prevent disc deformation and stem misalignment.
Low packing wear and external leakage (≤100 ppm under EPA21 standards).
Zero leakage Triple Offset Butterfly Valve
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