Silent check valve

Water system check valves are mainly used for clean water, hot and cold circulating water, domestic water supply and industrial water system, widely used in building water supply and drainage, HVAC, fire fighting and industrial water treatment and other fields. It is suitable for normal temperature and pressure to medium pressure working condition, and the working temperature range is generally from 0℃ to 120℃. Its function is to prevent backflow, protect pumps and system equipment, and ensure the safety of water quality. The valve relies on media pressure to open and close automatically, compact structure, opening and closing sensitive. Commonly used materials are ductile cast iron, brass, stainless steel, etc., the sealing surface can be rubber, PTFE, etc., good corrosion resistance, easy maintenance.

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products

Silent check valve

Model: H42X

Subtitle：Silent waterproof hammer check valve

The Silent Check Valve is a high performance check valve designed to prevent backflow in piping systems while eliminating noise and water hammer effects. The valve utilizes a silent closing mechanism and hydraulic dampening system to ensure smooth and quiet operation, making it ideal for residential, commercial and industrial applications.

Tags:Water Hammer Elimination Check Valve

Classification:Water system check valves

Working conditions:construction work, waterwork, water treatment plant

Product Overview

Made of ductile iron, stainless steel or bronze, this valve is durable and corrosion resistant for water, steam and oil systems. Its compact design and low pressure drop make it a reliable choice for HVAC systems, water supply networks and fire protection systems.

Main characteristics

Silent Shutdown Mechanism: Hydraulic dampening system ensures slow, controlled shutdown, reducing noise levels to less than 50 dB(A). Eliminates water hammer effect and protects pumps, piping and fittings.

Low resistance design: optimized flow path minimizes pressure drop and ensures energy efficiency. Ideal for high-flow systems such as heating, ventilation and air conditioning (HVAC) and water supply networks.

Durable construction: Valve body material: ductile iron (EN-GJS-400-18), stainless steel (CF8M) or bronze (C83600). Internal structure: Stainless steel valve flap and spring for corrosion resistance and long service life.

Compact and lightweight: Space-saving design simplifies installation in tight spaces.

Compliance: Meets EN 1074, AWWA C508 and ISO 5208 for water and wastewater applications.

Comparison with standard check valves

specificities	Silent check valve	Standard Check Valves
noise level	≤50 dB(A)	70-85 dB(A)
Closure mechanism	Hydraulic damping (2-10 seconds)	Spring or gravity (<1 sec)
Water hammer control	Excellent (eliminates pressure fluctuations)	Limited (may cause water hammer)
appliance	HVAC, water supply, fire protection	General industrial systems

Medium of use

Water/hot water

working condition

construction work, waterwork, water treatment plant

summarize

The Silent Check Valve is a reliable, high-performance solution for preventing backflow and eliminating noise in water, steam and oil systems. Its quiet closing mechanism, low resistance design and compliance with international standards make it ideal for HVAC, water supply and fire protection applications. The valve combines quiet operation with long-lasting performance to ensure system efficiency and longevity.

Product Parameters

Nominal diameter	DN50 to DN600 (2" to 24")
Nominal pressure	PN10 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 Material	Ductile Iron (EN-GJS-400-18), Stainless Steel (CF8M), Bronze (C83600)
Valve material	Stainless steel (316/304)
sealing material	EPDM, NBR or PTFE for zero leakage
connection method	Flanges (EN 1092, ASME B16.5)