Specification

Ductile Iron DN100-1200mm Gearbox / Pneumatic / Electric Acuator Double Offset Butterfly Valve

Product Overview

Newway Ductile Iron Double Offset Butterfly Valve: An Efficient Solution for Industrial Fluid Control

I. Product Technical Overview

Newway double offset butterfly valve is specially designed for fluid regulation and shut-off in industrial pipeline systems. It adopts a double offset sealing structure (dual eccentricity between the stem axis and disc center, as well as the sealing surface centerline), covering DN100-DN1200 (4″-48″) in diameter, suitable for PN10/PN16 (1.0/1.6MPa) and ANSI 125LB/150LB pressure classes, with medium temperature ranging from -20℃ to 120℃ and short-term resistance up to 150℃. The body uses ductile iron, the sealing seat adopts EPDM/NBR rubber, and it supports three drive modes: gearbox, pneumatic, and electric. Widely applied in municipal water supply/drainage, industrial fluid transportation, and building HVAC, it meets the control needs of media such as water, oil, and gas.

II. Core Product Features

(A) Double Offset Sealing Structure Design

The core advantage of Newway double offset butterfly valve lies in its geometric offset principle:

Dual Eccentric Design: The stem axis is offset by 1.5mm from the disc center and 1mm from the sealing surface centerline, making the disc completely disengage from the seat after opening 5°, reducing friction and wear. During closing, it gradually compresses the sealing surface with the increase of the angle, forming a self-tightening seal, with a leakage rate ≤5×10⁻⁸m³/s (EN12266 standard).

Low Torque Operation: The opening/closing torque is 30% lower than that of concentric butterfly valves. The gearbox driving torque for DN300 valve is ≤150N·m, adapting to the fast response needs of automation systems.

Wear Resistance: The offset structure avoids direct friction between the disc and seat, extending the service life by 2 times compared to ordinary butterfly valves in sewage with minor particles.

(B) High-Performance Material System

(C) Multi-Scenario Drive System

Gearbox Drive: Speed ratio 1:20-1:40, suitable for torque amplification of large-diameter valves. DN600 valve gearbox opening/closing time ≤30s.

Pneumatic Actuator: IP65 protection level, optional single-acting (spring return)/double-acting, air source pressure 0.4-0.7MPa, response time ≤5s.

Electric Actuator: Supports 4-20mA signal adjustment, positioning accuracy ±1%, compatible with DCS system remote control, with overload protection.

III. Key Technical Attributes

IV. Manufacturing Processes and Quality Control

(A) Precision Manufacturing Flow

Body Molding:

Adopts lost foam casting process. Ductile iron undergoes high-temperature annealing to relieve casting stress, with ferrite content ≥85% in the metallographic structure, ensuring low-temperature toughness (-20℃ impact energy ≥27J).

Castings are inspected by ultrasonic testing (UT), with surface roughness Ra≤12.5μm and dimensional accuracy reaching CT6 level.

Disc Processing:

The disc is processed by CNC lathe, with flatness error ≤0.03mm. Stainless steel discs are solution-treated with grain size ≥Grade 6.

Surface chrome/nickel plating (thickness ≥15μm), passing 500-hour salt spray test without corrosion.

Sealing Assembly:

Rubber sealing seats are compression-molded, with an interference fit gap with the body ≤0.02mm. Each valve undergoes 1.5x nominal pressure hydrostatic test (30-min hold) and 1.1x air pressure test (helium leak detection).

Sampled for 100,000 opening/closing life tests, with sealing performance retention rate ≥95%.

(B) Quality Certification System

Material Traceability: Batch numbers of key components can be traced to heat numbers and chemical composition reports, supporting third-party PMI material testing.

System Certifications: Certified by ISO 9001 and CE. Products for drinking water comply with WRAS standards.

Performance Guarantee: Commits to free replacement for leakage caused by process problems within an 18-month warranty period.