Flanged Swing Check Valve Model No. H44X-1.6

Flanged Swing Check Valve Definition and Components

A Flanged Swing Check Valve Model No. H44X-1.6 is an automatic, one-direction flow control valve designed for general industrial and commercial pipeline systems. The suffix "-1.6" specifically denotes its pressure rating of PN16 (16 bar, approximately 232 psi), making it suitable for medium-pressure applications. This model is part of the "H44X" series, where "H" indicates a check valve, "4" represents flanged ends, the second "4" signifies a swing disc design, and "X" denotes a resilient (rubber) seat for tight sealing.

Key Terminology:

• Flanged Ends:The valve has integral flanges for bolted connection to pipelines, ensuring robust and leak-proof installation.
• Swing Disc:The closure mechanism is a hinged disc that swings open with forward flow and closes automatically to prevent backflow.
• Resilient Seat:Features an elastomer sealing surface, providing bubble-tight closure and reducing water hammer effects compared to metal-to-metal seats.
• PN16 Rating:The valve is designed for a maximum working pressure of 16 bar at a specified temperature (usually 120°C for cast iron), following European (EN) and ISO pressure class standards.

Fire Protection Check Valve Main Parts:

• Valve Body: The main pressure-containing component with integrally cast flanges.
• Cover/Bonnet: Provides access to internal parts and is bolted to the body.
• Disc: The swinging closure member that moves on a hinge.
• Hinge Pin/Arm Assembly: Allows the disc to pivot freely.
• Resilient Seat Ring: Made of elastomer (e.g., NBR, EPDM), mounted in the body to ensure tight sealing with the disc.
• Gasket: Seals the joint between the body and cover.
• Fasteners: Bolts, nuts, and washers for assembling the valve and connecting it to pipelines.

Role, Characteristics, and Application Scenarios of Flanged Swing Check Valve in Pipelines

Fire Check Valve Functions:

• Backflow Prevention:Automatically prevents reverse flow in pipelines, ensuring unidirectional flow.
• Equipment Protection:Safeguards pumps, compressors, and other equipment from damage caused by backflow.
• System Integrity:Maintains pressure and prevents contamination by isolating different sections of a system.

Operational Features:

• Automatic Operation:Functions based on flow dynamics—opens with forward flow and closes under backflow or gravity.
• Low Flow Resistance:The disc swings fully open, offering minimal obstruction to flow, which reduces pressure drop.
• Bubble-Tight Sealing:The resilient seat ensures near-zero leakage when closed.
• Horizontal Installation Required:Must be installed horizontally with the hinge pin axis horizontal to ensure proper disc swing and gravity-assisted closure. Vertical installation is not recommended unless specifically designed.
• Slam Potential:Like most swing check valves, it may experience disc slam under rapid flow reversal, leading to water hammer. For systems prone to this, a non-slam or spring-assisted check valve is preferred.

Primary Usage Scenarios:

This valve is commonly used in water supply, HVAC, industrial process lines, and irrigation systems where PN16 pressure rating is sufficient and backflow prevention is necessary.

Scenario Diagram:

Flanged Swing Check Valve Standards: Materials, Design, and Connections

How to Select Flanged Swing Check Valve

Step 1: Define Technical Specifications

Ensure the valve meets the system requirements for PN16 pressure rating.

• Service Conditions:Specify fluid type, maximum temperature (e.g., 120°C for cast iron with EPDM seat), and design pressure (e.g., 16 bar).
• Size & Flange Details:Nominal Diameter (e.g., DN200) and Flange Standard (e.g., EN 1092-2 PN16, Form B1, Raised Face).
• Materials:Body material (e.g., Ductile Iron EN-GJS-400-15), seat material (e.g., EPDM per EN 681-1), disc and hinge pin material (e.g., Stainless Steel).
• Design Standard:Reference EN 12334 for design compliance.
• Special Requirements:If slam prevention is needed, consider a different model (e.g., spring-assisted check valve).

Step 2: Source and Evaluate Suppliers

• Source from manufacturers specializing in EN/ISO standard valves, particularly those with a CE marking if required for the European market.
• Request product data sheets, material certifications (e.g., 3.1 material certificates per EN 10204), and dimensional drawings.
• Verify that the valve is rated for PN16 and suitable for the intended service.

Step 3: Order Execution

• Confirm lead times and availability for required sizes and materials.
• Required documents: Commercial Invoice, Packing List, Certificate of Conformity (CoC), and Material Test Certificatesper EN 10204.

Pre-Shipment Inspection for Export Valves and Key Considerations

Fire Fighting Valve Inspection Checklist:

Key Precautions for Export:

• Immobilize the Disc:Secure the disc using a plastic clamp, wooden block, or strong nylon strap to prevent damage to the hinge pin and seat. This is critical for swing check valves.
• Protect Flange Surfaces:Use proper flange protectors that are bolted on, not just taped, to prevent damage to the sealing faces.
• Corrosion Prevention:Apply a suitable anti-corrosion coating or VCI (Vapor Corrosion Inhibitor) to all machined surfaces, especially the flange faces and bolt holes.
• Robust Crating:Due to the weight and shape, use strong wooden crates with internal bracing. Clearly mark the lifting points and "TOP" side on the crate.
• Documentation Pack:Include copies of the test certificates, material certificates, and installation manual in a waterproof bag inside the crate. Ensure the commercial documents state the correct pressure rating (PN16).

Flanged Swing Check Valve Size Chart