Coliter ® Double Eccentric Telescopic Butterfly Valve – PN10/16, -10~120°C, Integrated Expansion Joint for Pipeline Stress Relief

SD(3/9)42X Double Eccentric Telescopic Butterfly Valve – Dual-Offset Design with Axial Extension for Pump Stations & Thermal Pipelines

The Coliter® SD(3/9)42X Double Eccentric Telescopic Butterfly Valve is an advanced flow control solution that combines the functions of a high-performance butterfly valve and an expansion joint in a single unit. Engineered for water supply, HVAC, fire protection, and industrial systems, it features a double eccentric (dual-offset) disc design—where the shaft is offset both from the centerline of the bore and the seat sealing plane—minimizing friction during operation and enabling bubble-tight shut-off with extended seal life. The integrated telescopic (axial extension) mechanism allows for controlled linear movement (typically ±20–50 mm depending on size), absorbing thermal expansion, contraction, and pipeline misalignment stresses—making it ideal for pump discharge lines, underground installations, and long-distance pipelines. Constructed with a ductile iron (QT450) body, stainless steel disc and shaft, and a soft-sealing seat made of EPDM or NBR rubber, it ensures corrosion resistance and reliable sealing. Rated for P_N10/PN16 (1.0–1.6 MPa), it operates within a temperature range of -10℃ to 120℃ (soft seal) or up to 200℃ with optional metal seals. Available in sizes from DN300 to DN1200, it complies with GB/T 12238 and features flanged end connections per ISO 7005 / GB/T 17241.6. Drive options include manual, worm gear, electric (SD942X), or pneumatic (SD642X). This valve delivers lower operating torque, reduced wear, and dual functionality—eliminating the need for separate expansion joints while ensuring system integrity and maintenance efficiency.