Specification

Newway Flanged Knife Gate Valve: Industrial Solution for Particulate Media Control

I. Product Overview

Newway flanged knife gate valves are specifically designed for fluids containing solid particles or fibrous materials, constructed from high-strength ductile iron (GGG50) or stainless steel (304/316). The vertical-lifting knife gate enables precise flow cutoff, covering DN50-DN600 (2″-24″) with PN10-PN16 (1.0-1.6MPa) pressure ratings. Ideal for sewage, papermaking, and food slurry applications, the blade-shaped gate cuts through viscous media while elastic sealing ensures zero leakage—perfect for industrial solid-liquid mixed fluid control.

II. Core Technical Parameters

Specifications & Pressure Classes

Nominal Diameter: DN50-DN600 (2″-24″), customizable for extra-large sizes

Pressure Rating: PN10/PN16 (1.0MPa/1.6MPa) for medium-low pressure systems

Temperature Range: -20℃~120℃ (standard), -40℃~200℃ (high-temperature customization)

Materials & Sealing System

Body/Gate: Ductile iron GGG50 (tensile strength ≥500MPa), 304/316 stainless steel

Sealing Components: NBR or VITON, leakage rate ≤0.1% (API 598)

Stem: 2Cr13 stainless steel, chrome-plated (HRC35+ hardness) for corrosion resistance

Connection: Flanged (ASME B16.5, GB/T 9113), RF face

Actuation & Operation

Manual Drive: Aluminum handwheel, DN100 operating torque ≤120N·m

Pneumatic/Electric Actuation: Optional, response time ≤1 second

Protection Grade: IP65 (body), Ex d IIB T4 (explosion-proof for electric models)

Product Overview

III. Structural Design & Technical Features

**Knife Gate Flow Optimization

Blade-shaped gate design cuts through fibrous media (e.g., paper pulp, sewage fabrics) to prevent tangling.

Straight-through flow path reduces flow resistance by 25% compared to conventional gate valves, suitable for high-viscosity fluids.

**Elastic Sealing Reliability

Lip-shaped elastic seat design automatically compensates sealing specific pressure (≥8MPa) via medium pressure.

Double-sealing surface grinding precision ≤0.03mm flatness, verified by red lead powder testing.

**Anti-Jamming Details

Gate guide groove tolerance ≤0.1mm ensures precise lifting, avoiding particle jamming.

Inclined body bottom design prevents medium sedimentation, improving self-cleaning by 30%.

IV. Manufacturing Processes & Quality Control

**Precision Casting

Ductile iron castings use lost foam process with graphite spheroidization grade ≥2, eliminating shrinkage defects.

Stainless steel parts undergo 1050℃ solution treatment, grain size ≥Grade 5 for excellent intergranular corrosion resistance.

**High-Precision Machining

Gate blade processed by 5-axis CNC grinder, edge roughness Ra≤1.6μm.

Stem thread precision reaches 6g grade, fit clearance ≤0.05mm.

**3D Quality Inspection

Hydrostatic test: 1.5x working pressure for shell (30min hold), 1.1x for sealing (zero leakage).

Spectral analysis: Element deviation ≤0.05% per heat to ensure material consistency.

NDT: 100% ultrasonic testing (UT), compliant with GB/T 2970 Grade III.