High Quality Flange Knife Gate Valve Pneumatic Stainless Steel Knife Gate Valve

III. Structural Design & Technical Features

1. **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.

2. **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.

3. **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

1. **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.

2. **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.

3. **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.