Specification

DN50 PN16 Brass/Aluminum Bronze Flanged Ends Swing Check Valve

I. Product Overview

TIANYU DN50 PN16 brass/aluminum bronze flanged ends swing check valve is a specialized backflow prevention component designed for medium-diameter industrial pipelines. Crafted with brass (for general water systems) or aluminum bronze (for corrosive environments like marine settings), it features a swing disc structure and flanged connection to ensure unidirectional flow of water, oil, and mild corrosive media. Operating at -10℃~120℃ and PN16 pressure, it closes automatically when flow reverses, protecting pumps and pipelines from damage. Compliant with EN12334 and API 598 standards, it balances compact design, corrosion resistance, and reliable backflow prevention—ideal for water supply, marine, and light industrial systems where safety and space efficiency matter.

II. Key Attribute Parameters

Size: DN50 (2″), optimized for medium-diameter pipelines in water supply and industrial flow control.
Pressure Rating: PN16 (1.6MPa), suitable for low to medium pressure applications such as hot water lines and marine auxiliary pipelines.
Temperature Range: -10℃~120℃, adapting to ambient and moderately heated media like hot water and low-pressure steam.
Material Configuration:
- Body & Disc: Brass (for freshwater systems) or aluminum bronze (resisting saltwater corrosion in marine use).
- Pin: Stainless steel 304, ensuring strength to support the swing disc and resisting rust.
- Seat: EPDM (for water/hot water) or PTFE (for mild chemicals), achieving tight sealing and media compatibility.
- Flange: Integral with body, compliant with EN1092 PN16 and ASME B16.5 Class 150 for global pipeline integration.
Connection Type: Flanged ends, fitting securely between pipeline flanges for leak-tight installation.
Design Standards: EN12334, API 598, ensuring compliance with industrial performance and testing requirements.

Product Overview

III. Features Description

Swing Disc Backflow Prevention: The disc swings open under forward flow (driven by media pressure) and closes automatically via gravity within 1~2 seconds when flow reverses. This prevents pump cavitation, media mixing, and pipeline overpressure—critical for protecting water pumps and marine equipment.
Material-Specific Corrosion Resistance: Brass bodies resist rust in freshwater systems, while aluminum bronze (containing 9~12% aluminum) withstands saltwater corrosion in marine environments, avoiding the rust-related jamming common in carbon steel valves.
Tight Sealing Performance: EPDM/PTFE seats form a reliable seal with the disc, achieving API 598 leakage standards (no visible leakage under test pressure). EPDM handles hot water up to 120℃, while PTFE resists mild acids and solvents.
Low Flow Resistance: The streamlined internal flow path and full-port design minimize pressure drop, allowing unobstructed media flow to reduce pump energy consumption in water circulation systems.
Easy Installation & Maintenance: Flanged ends align with standard pipeline flanges for quick installation. The replaceable seat and accessible disc make maintenance simple—components can be replaced without removing the valve from the pipeline.

IV. Manufacturing Processes

Material Inspection: Brass and aluminum bronze castings undergo ultrasonic testing to eliminate internal defects. Chemical analysis verifies alloy content (e.g., brass with 60~65% copper) to ensure corrosion resistance.
Precision Machining: CNC lathes machine the valve body and disc to tight tolerances (±0.05mm), ensuring the disc swings smoothly without jamming. Flange faces are finished to Ra ≤1.6μm for leak-tight gasket sealing.
Seat Assembly: EPDM/PTFE seats are molded to fit the valve’s sealing surface and bonded with high-temperature adhesive. The seat-disk contact area is lapped to enhance sealing precision.
Testing:
- Hydrostatic Test: Body tested at 2.4MPa (1.5×PN16) for 30 minutes; seat tested at 1.76MPa (1.1×PN16) with water to confirm no leakage.
- Operation Test: 100+ open/close cycles verify smooth disc movement, with focus on closing speed under simulated backflow.

Valve Details

V. Product Advantages

Reliable Backflow Protection: Rapid disc closure reduces equipment damage risks by 90% compared to slow-closing valves, lowering maintenance costs in water and marine systems.
Long Service Life: Brass and aluminum bronze materials extend service life to 8~10 years in their respective environments, outperforming plastic valves in durability.
Energy Efficiency: Low flow resistance cuts pump energy consumption by 15% in water circulation systems, ideal for large-scale water supply networks.
Versatile Compatibility: Flanged design and standard compliance fit global pipelines, avoiding the need for custom adapters in international projects.
Low Maintenance: Replaceable seats and accessible components simplify repairs, reducing downtime by 50% compared to welded valves.

Application

VI. Application Fields

Municipal Water Supply: Installed in water distribution pipelines and pump outlets, with brass bodies and EPDM seats resisting chlorine and ensuring uninterrupted water flow.
Marine Systems: Used in small-diameter ballast and freshwater lines on ships, with aluminum bronze bodies resisting saltwater corrosion to prevent backflow between systems.
HVAC & Plumbing: Controls hot water flow in building heating systems, with EPDM seats handling 120℃ temperatures and maintaining sealing performance.
Light Industrial: Manages coolant and mild chemical flow in small-scale factories, with PTFE seats resisting weak acids and ensuring media purity.
Food & Beverage: Regulates potable water flow in processing lines, with brass bodies (food-safe) and EPDM seats avoiding contamination.