Butterfly type slow closing check valve

Butterfly check valve is suitable for water, sewage, oil and gas and other media, widely used in municipal water supply and drainage, chemical industry, fire fighting and HVAC systems. Its structure is compact, rapid opening and closing, suitable for low-pressure working conditions, the working temperature is generally 0 ℃ to 150 ℃. The valve plate realizes one-way control of medium flow direction through rotation, prevents backflow and protects the safety of pipeline network. Valve body materials commonly used include ductile cast iron, stainless steel and carbon steel, sealing materials are mostly rubber or fluorine plastic, with good corrosion resistance and sealing performance, easy maintenance and long service life.
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Butterfly type slow closing check valve

Butterfly type slow closing check valve

Model: HH47X
Subtitle：Large diameter check valve
The Large Bore Check Valve is a high performance butterfly check valve designed for large piping systems that require reliable flow control and water hammer protection. Suitable for use in water supply, wastewater treatment, power generation and industrial processes, the valve prevents backflow and protects piping and equipment from damage caused by backflow or pressure fluctuations.
Tags:Water Hammer Elimination Check Valve
Classification:Butterfly Check Valve
Working conditions:power plants, waterwork, water treatment plant
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Product Overview

The Large Bore Check Valve is a high performance butterfly check valve designed for large piping systems that require reliable flow control and water hammer protection. Suitable for use in water supply, wastewater treatment, power generation and industrial processes, the valve prevents backflow and protects piping and equipment from damage caused by backflow or pressure fluctuations.

Available in a variety of sizes from DN300 to DN2600 (12 in. to 104 in.), the valves are constructed of durable materials such as ductile iron, carbon steel, or stainless steel to ensure long-lasting performance even in harsh environments. Its butterfly flap design minimizes pressure drop and provides efficient, low-maintenance operation.

Applicable working conditions

Water supply network: pump discharge points installed in municipal water supply systems and reservoirs.

Wastewater treatment: for sewage discharge and sludge treatment systems.

Power generation: Protection of cooling water circuits and condensate recovery systems in power plants.

Industrial piping: for large process water, oil and gas systems.

Product Characteristics

Butterfly valve flap design: Large diameter butterfly valve flap ensures low resistance to flow with a flow coefficient (Cv) of 0.1-0.6. Suitable for high flow systems such as water supply and sewage treatment plants.

Durable construction: Valve body material: ductile iron (EN-GJS-400-18), carbon steel (ASTM A216 WCB) or stainless steel (ASTM A351 CF8M). Internal structure: Stainless steel butterfly valve flap and spring for corrosion resistance and long service life.

Reliable sealing: Metal-to-metal seal: for high temperature and high pressure applications. Rubber seals: ensure zero leakage in water and wastewater systems.

Low Maintenance: Self-cleaning design and corrosion-resistant materials reduce downtime and maintenance costs.

Compliance: Meets international standards such as AWWA C508, EN 1074 and ISO 5208.

Product Advantages

Watertight hammer: slow-closing mechanism reduces pressure fluctuations and protects piping.

Energy saving: low resistance to flow minimizes pump energy consumption.

Versatile: suitable for horizontal or vertical installation (upward flow).

Easy to install: flange connections simplify integration with existing systems.

Comparison with standard check valves

specificitiesLarge caliber check valveStandard Check Valves
fluxHigh (Cv ≥10,000 at DN1000)Medium (Cv ≤5,000 for DN1000)
Water hammer controlExcellent (slow closure mechanism)Limited (may cause water hammer)
applianceLarge-scale water supply, power generationGeneral industrial systems
cost-effectivenessHigher upfront costs, lower life cycle costsLower upfront costs

Medium of use

Water/hot water

working condition

power plants, waterwork, water treatment plant

summarize

The Large Bore Check Valve is a reliable, high-performance solution for preventing backflow and mitigating water hammer in large piping systems. Its butterfly flap design, durable construction and compliance with international standards make it ideal for use in water supply networks, wastewater treatment plants and industrial systems. The valve combines energy efficiency and reliable performance to ensure the safety and longevity of critical infrastructure.

Product Parameters

Nominal diameterDN300 to DN2600 (12" to 104")
Nominal pressurePN10 to PN25 (EN 1092) or Class 150 to Class 300 (ASME B16.34)
Applicable temperature-10°C to 120°C (EPDM seals) / -20°C to 80°C (NBR seals)
Valve MaterialDuctile Iron (EN-GJS-400-18), Carbon Steel (WCB), Stainless Steel (CF8M)
Valve materialDuctile Iron (EN-GJS-400-18), Carbon Steel (WCB), Stainless Steel (CF8M)
sealing materialEPDM, NBR or PTFE for zero leakage
connection methodFlanges (EN 1092, ASME B16.5)

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