Dual Plate Brass Swing Check Valve 6 Inch Double Disc Bronze Wafer Check Valve

Specification

TIANYU Dual-Plate Swing Wafer Check Valve: Bronze Industrial Backflow Prevention Solution

I. Product Overview

TIANYU dual-plate swing wafer check valves are constructed from C95300/C95400 bronze alloys, designed to ASME B16.10 and API 594 standards. The dual plates rotate around a pin to prevent backflow automatically, covering DN50-DN300 (2″-12″) with Class 150 (PN20) pressure rating and -20℃~120℃ temperature range. Suitable for water, seawater, and mildly corrosive media, they excel in municipal water supply, marine, and food processing applications.

II. Core Technical Parameters

Specifications & Operating Range
- Nominal Diameter: DN50/80/100/150/200/250/300 (2″/3″/4″/6″/8″/10″/12″)
- Pressure Class: Class 150 (PN20, test pressure 3.0MPa)
- Temperature Range: -20℃~120℃ (standard), -40℃~150℃ (high-temperature bronze option)
- Media Compatibility: Freshwater, seawater, non-corrosive oils, food-grade liquids
Materials & Sealing System
- Body/Disc: C95300 aluminum bronze (tensile strength ≥540MPa), C95400 nickel-aluminum bronze (seawater-resistant)
- Sealing Pair: Bronze metal seal (Ra≤1.6μm), optional NBR rubber lining (leakage rate ≤0.1%)
- Connection: Wafer Type (fits ASME B16.5 flanges)
- Pin Shaft: 316 stainless steel (HRC30-35), erosion-resistant
Mechanical Performance
- Opening Pressure: ≤0.03MPa (forward flow resistance)
- Closure Response Time: ≤0.5s (triggered by backflow)
- Fatigue Life: 100,000 cycles without seal failure (GB/T 13932)

Product Overview

III. Structural Design & Technical Features

Dual-Plate Swing Mechanism
- Symmetric dual plates disperse medium impact, reducing water hammer effect by 50% vs. single-plate valves, suitable for high-flow pipelines (velocity ≤12m/s).
- Plate opening angle ≤45° with streamlined flow path, DN100 pressure loss ≤0.08MPa (25% lower than lift checks).
Bronze Material Advantages
- Aluminum bronze (8-10% Al) corrodes at ≤0.05mm/year in seawater, ideal for marine systems.
- Nickel-aluminum bronze with nickel content offers 40% better chloride resistance, withstands Cl⁻ ≤30,000ppm.
Compact Installation Design
- Wafer structure shortens length by 40% and reduces weight by 30% vs. flanged types, saving installation space.
- Disc replacement requires no pipeline disassembly, maintenance time reduced to 1.5 hours/operation.

IV. Manufacturing Processes & Quality Control

Precision Casting Flow
- Investment casting process, blank tolerance ≤±0.5mm, 100% ultrasonic testing (UT) for internal shrinkage.
- Bronze parts solution-treated at 950℃, grain size controlled to Grade 5+ for 30% higher fatigue resistance.
Surface Treatment Technology
- Seal surfaces ground by 5-axis CNC to flatness ≤0.01mm, red lead test contact rate ≥85%.
- Pin shaft chrome-plated (≥20μm) with PTFE bearings, friction coefficient reduced to 0.08.
Comprehensive Testing
- Hydrostatic test: 1.5x pressure (3.0MPa) held 30min, 1.1x sealing pressure (2.2MPa)—zero leakage.
- Salt spray test: C95400 passes 1000h without corrosion (ASTM B117).
- WRAS certified: Material complies with UK drinking water standards for municipal use.

Valve Details

V. Core Product Advantages

Exceptional Corrosion Resistance
- Marine industry: C95400 valves in seawater cooling systems last 5 years leak-free, 3x longer than cast iron alternatives.
- Offshore projects: Withstands 20,000ppm Cl⁻ seawater, corrosion rate 1/10th of cast iron.
Efficient Backflow Prevention
- Dual-plate linkage closes rapidly during flow deceleration, reducing water hammer pressure by 90% in a municipal pump station case.
- Bronze seal resists wear in particle-laden media (≤0.5mm particles), lifespan >80,000 cycles.
Easy Installation & Maintenance
- Wafer installation requires no additional supports, DN150 installation time 40% faster than flanged valves.
- 3-year warranty includes free seal lapping service, total cost of ownership (TCO) reduced by 25%.

Application

VI. Application Fields & Cases

Port desalination plant: DN200 C95400 valve in 28,000ppm Cl⁻ seawater line, 3-year wear ≤0.1mm.
Food beverage factory: DN100 bronze valve with NBR lining meets FDA standards, extends milk pipeline cleaning cycles to 6 months.
High-rise building: DN150 valve in 12-story fire pipeline reduces vibration by 60% through water hammer protection.

VII. Installation & Maintenance Guide

Installation Notes
- Mount horizontally between flanges, align flow with body arrow; torque bolts diagonally in three steps (ASME PCC-1).
- DN≥200 valves recommend supports to avoid pipeline stress affecting seals.
Routine Maintenance
- Check plate mobility quarterly; flush pin area monthly in seawater systems to prevent biofouling.
- Minor seal wear repairable by lapping; replace rubber lining for severe damage.

VIII. Product Summary & Market Positioning

TIANYU dual-plate swing wafer check valves leverage bronze corrosion resistance and dual-plate design, covering DN50-DN300 with Class 150 rating. Precision casting and WRAS certification deliver reliable solutions for marine, offshore, and municipal sectors. Their long life, low maintenance, and superior corrosion resistance make them preferred alternatives to steel check valves.