Flange Size Optional 360° Metal Lip Fixed Bidirectional Flow Soft Seal Plug Valve Sleeve Type Soft Sealing Plug Valve

Specification

TIANYU 360° Metal Lip Check Valve: Full-Bore Industrial Pipeline Backflow Prevention Solution

I. Product Overview

TIANYU 360° metal lip check valves are constructed from WCB carbon steel, 304/316 stainless steel, and ductile iron, designed to ASME B16.34, API 594, and GB/T 12236 standards. The metal lip disc automatically rebounds to enable unobstructed one-way flow control. Covering DN50-DN1200 (2″-48″) with pressure classes PN10-PN40 (Class 150-Class 300), they operate at -40℃~232℃, suitable for water, sewage, oil, steam, and other industrial media in municipal water supply, industrial circulating water, and building fire protection systems.

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), PN25 (2.5MPa), PN40 (4.0MPa)
- Temperature Range: -40℃~232℃ (standard), -196℃~300℃ (low/high temperature customization)
- Media Compatibility: Freshwater/seawater, sewage (solid content ≤5%), lubricating oil, saturated steam (≤1.6MPa)
Materials & Sealing System
- Body/Bonnet: WCB carbon steel (tensile strength ≥485MPa), QT450-10 ductile iron (elongation ≥10%), 316 stainless steel (ASTM A351 CF8M)
- Disc: Metal lip structure (carbon steel overlaid with STL alloy/stainless steel monolithic), sealing surface roughness Ra≤1.6μm
- Connection: Flanged (RF face, ASME B16.5/GB/T 9113), wafer type (for double-flange installation)
- Sealing Type: Metal hard seal (leakage rate ≤1×10⁻⁶cc/s), optional NBR rubber soft seal (Class VI)
Mechanical Performance
- Opening Pressure: ≤0.015MPa (forward flow resistance)
- Closure Response Time: ≤0.2s (triggered by backflow)
- Fatigue Life: 100,000 cycles without seal failure (GB/T 13932 standard)

Product Overview

III. Structural Design & Technical Features

360° Metal Lip Disc
- Self-Balancing Rebound Design: The lip disc edge features a 45° bevel that automatically conforms to the seat using media pressure, achieving bidirectional bubble-tight sealing with specific pressure ≥15MPa.
- Low Flow Resistance: Flow resistance coefficient ≤0.7 (DN100), 35% lower than traditional swing check valves, suitable for media velocity ≤10m/s.
- Jamming-Free Structure: No moving pins between disc and seat prevent blockage by particles (≤2mm), ideal for sewage containing suspended solids.
Full-Bore Streamlined Design
- The body uses an equal-diameter flow path with polished inner wall (Ra≤6.3μm) to minimize media deposition and scaling, ensuring long-term operation in sewage pipelines.
- Wafer-type structure is only half the length of flanged valves, reducing weight by 40% and saving installation space and pipeline support costs.
Environmental Adaptability
- Low-Temperature Toughness: Ductile iron disc maintains impact toughness ≥30J/cm² at -40℃ to prevent cold cracking.
- High-Temperature Stability: 316 stainless steel withstands creep strength ≥120MPa at 232℃ for reliable long-term sealing.

IV. Manufacturing Processes & Quality Control

Precision Casting & Machining
- Body Casting: Ductile iron parts use lost foam casting with graphite nodularity ≥90% (GB/T 1348), 100% ultrasonic testing (UT) for internal defects.
- Sealing Surface Treatment: Metal lip edges are CNC ground with angle deviation ≤0.5°, contact rate ≥85% verified by red lead test.
Surface Protection Technology
- Carbon steel bodies are hot-dip galvanized (coating thickness ≥85μm), passing 1000-hour salt spray test (ASTM B117).
- Stainless steel parts undergo pickling and passivation to form a dense oxide film, improving chloride resistance by 50% (Cl⁻≤5000ppm).
Comprehensive Testing System
- Hydrostatic Test: 1.5x pressure (2.4MPa for PN16) held 30min, 1.1x sealing pressure—zero leakage.
- Particle Tolerance Test: Passes continuous 冲刷 test with 1mm particles, seal wear ≤0.08mm after 10,000 cycles.
- Certifications: ISO 9001:2015, CE-PED 2014/68/EU, provides Material Test Reports (MTR) and pressure test certificates.

Valve Details

V. Core Product Advantages

Multi-Scenario Backflow Prevention
- Municipal Water Supply: DN600 PN16 valve at pump station outlet closes in 0.2s to prevent backflow, leak-free operation for 5 years in a waterworks case.
- Industrial Wastewater Treatment: Ductile iron body resists sewage corrosion, lip structure prevents sludge entanglement, reducing maintenance frequency by 60% in a petrochemical plant.
- Building Fire Protection: DN100 PN25 valve meets GB 50974 standards, reduces water hammer pressure peak by 40%.
Full-Life Cycle Cost Optimization
- Maintenance-Free Design: No moving parts to wear, lubrication-free, maintenance-free cycle up to 8 years or 100,000 cycles, reducing maintenance costs by 70% compared to traditional valves.
- Quick Replacement: Wafer structure allows seal replacement in ≤30 minutes without pipeline disassembly, minimizing downtime.
Installation Flexibility
- Flange Compatibility: Supports ASME, DIN, GB standards; DN200 valve directly replaces same-size imported products.
- Direction Adaptability: Installs horizontally/vertically (vertical flow upward), no strict angle restrictions for complex pipeline layouts.

Application

VI. Application Fields & Case Studies

Urban Wastewater Treatment Plant: DN800 PN10 valve controls return sludge (3% solids) in aeration tanks, lip disc operates jam-free, reducing annual overhauls from 4 to 1.
Thermal Power Plant Circulating Water System: 316 stainless steel valve in chloride-containing (1500ppm) cooling water shows only 0.1mm seal wear after 7 years.
Commercial Complex Fire Protection System: DN150 PN16 valve passes 3C certification, maintains sealing performance after 100 water hammer impacts at 1.6MPa.