Specification

NEWWAY ANSI DN1200 Ductile Iron Manual Flange Type Globe Valve

I. Product Overview

NEWWAY ductile iron flange globe valves are designed to strict BS5152 and ANSI B16.10 standards, constructed from QT450-10 ductile iron and HT250 gray cast iron. Operated manually for flow cutoff and regulation, these valves cover DN50-DN1200 (2″-48″) with PN10-PN16 (1.0-1.6MPa) pressure ratings, suitable for -10℃~80℃ media like water, sewage, and neutral liquids. Their dual-seal structure and precision casting ensure stable performance in municipal water supply, building networks, and industrial water treatment.

II. Core Technical Parameters

Specifications & Operating Range

Nominal Diameter: DN50/80/100/150/200/250/300/400/500/600/800/1000/1200 (2″-48″)

Pressure Class: PN10 (1.0MPa), PN16 (1.6MPa) (compliant with BS EN 1092-1 flanges)

Temperature Range: -10℃~80℃ (standard), -20℃~120℃ (optional special seals)

Media: Water, sewage, non-corrosive oils, air

Materials & Sealing System

Body/Bonnet: QT450-10 ductile iron (tensile strength ≥450MPa, elongation ≥10%), HT250 gray cast iron (HB200-240)

Disc/Seat: Ductile iron metal seal (Ra≤1.6μm), optional NBR/EPDM soft seal (leakage rate ≤0.1%)

Connections: Flanged (RF face, BS EN 1092-1/ANSI B16.5), female threaded (NPT, API 5B)

Actuation: Manual (handwheel/lever, operating torque ≤200N·m@DN200)

Certifications

Quality System: ISO 9001:2015

Product Certifications: CE-PED 2014/68/EU, WRAS (UK drinking water), ACS (French sanitary standard)

Product Overview

III. Structural Design & Technical Features

International Standard Compliance

Body length meets ANSI B16.10, flange dimensions compatible with BS EN 1092-1 and GB/T 9113 for global projects.

Ergonomic handwheel design: levers for DN≤150, gear-reduced handwheels for DN≥200 to minimize operating force.

Durability Optimization

Ductile iron body annealed at 920℃ to eliminate casting stress, fatigue resistance 30% higher than common cast iron.

Stem made of 2Cr13 stainless steel (HRC30-35), chrome-plated (≥25μm) for corrosion and wear resistance.

Enhanced Sealing Performance

Wedge disc with 5° tapered seat self-seals via medium pressure, sealing specific pressure ≥15MPa.

Packing uses V-type PTFE + flexible graphite, gland bolts adjustable online for zero external leakage (≤1×10⁻⁶cc/s).

IV. Manufacturing Processes & Quality Control

Precision Casting Flow

Lost foam casting process, blank dimension tolerance ≤±0.8mm, 100% magnetic particle inspection (MPI) for surface cracks.

Ductile iron parts low-temperature annealed (550℃×2h), graphite morphology controlled to GB/T 1348 Grade Ⅱ+.

High-Precision Machining

Seat sealing surface CNC lapped to flatness ≤0.01mm, red lead test contact rate ≥85%.

Stem straightness ≤0.02mm/m, coaxiality with packing ≤0.05mm for smooth operation.

3D Quality Inspection

Hydrostatic test: 1.5x working pressure (2.4MPa for PN16) held 30min, 1.1x sealing pressure—zero leakage.

Material traceability: Spectral analysis per heat (C/Si/Mn deviation ≤0.05%), provided with Material Test Reports (MTR).

Life test: 100,000 cycles without sealing degradation (GB/T 13932).