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

Product Attribute: port size:DN50-DN1200
structure:Gate
application:General
power:Pneumatic
customized support:OEM, ODM
temperature of media:Normal Temperature
brand name:TIANYU
media:sewage,slurry and else
Keyword:pneumatic knife gate valve
material:stainless steel
Medium:sewage,slurry and else
Connection:flange,lug
Product name:pneumatic stainless steel knife gate valve

INFO@TYFLUIDGROUP.COM

Specification

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

I. Product Overview

TIANYU 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.

Valve Details

V. Core Product Advantages

**Multi-Scenario Adaptability

Wastewater treatment: Resists sand abrasion, gate cuts fibrous impurities in sewage for DN≤300 pipes.
Papermaking: VITON seals withstand 120℃ cooking liquor, service life >8 years.
Food processing: 316 stainless steel + FDA-certified seals meet 3-A sanitary standards for slurry transport.

**Full-Life Cost Optimization

Replaceable seat design reduces on-site maintenance costs by 50%.
Maintenance-free cycle reaches 10,000 operations, doubling similar products.

**Global Certification Support

CE/PED 2014/68/EU certified, China Special Equipment Manufacturing License (TS).
Provides Material Test Reports (MTR) and pressure test certificates (ISO 5208).

Application

VI. Application Fields & Cases

Municipal wastewater plant: DN400 PN10 knife gate valve in post-grating pipes, 3-year jam-free operation for fibrous sewage.
Papermaking pulping workshop: DN200 PN16 stainless steel valve controls wood pulp, VITON seals maintain zero leakage at 80℃.
Food starch plant: DN100 316 stainless steel valve in corn slurry pipes, electropolished (Ra≤0.8μm) to meet FDA standards.

VII. Customization Services

**Material Upgrades

Duplex stainless steel (2205): Resists Cl- ≤20,000ppm for seawater treatment.
Hastelloy C-276: Withstands strong acid/alkali (pH 1-14) media.

**Functional Enhancements

Anti-static design: Conductive spring between gate and body, ground resistance ≤10Ω.
Fire-safe structure: Complies with API 6FA, maintains sealing for 30min during fires.