A silent check valve is an automatic valve that controls the opening and closing of the valve disc based on the direction of medium flow, allowing only unidirectional flow and preventing backflow. Its core design achieves silent operation through a streamlined internal flow channel and a short-stroke valve disc:
Forward Flow: Medium pressure pushes the valve disc open, allowing fluid to flow smoothly along the streamlined channel with minimal pressure loss.
Reverse Flow: The valve disc closes quickly under its own weight, the reverse pressure of the medium, and the spring force, blocking backflow and avoiding the noise generated by valve disc impact in traditional valves.
Core Structural Advantages
Outstanding Quiet Performance: Through optimized structure (such as a slow-closing valve disc and soft-seal materials), noise is controlled at 20-40dB (close to a library environment), far lower than the 30-60dB of traditional check valves. Suitable for noise-sensitive scenarios:
Residential Systems: Avoids noise interference from toilet flushing, washing machine drainage, etc.
Medical and Office Facilities: Hospital operating rooms, laboratories, and central air conditioning systems in office buildings require a quiet environment.
High-Efficiency Backflow Prevention and System Protection
Fast Response: The valve disc triggers closure at the initial stage of backflow, preventing high-pressure media from impacting the pump body, heat exchangers, and other equipment.
Stable Sealing: Rubber or PTFE soft-seal valve seats reduce the risk of leakage, suitable for water supply, drainage, HVAC, and other systems with high sealing requirements.
Energy Saving and Flow Resistance Optimization: The streamlined straight-through flow channel design reduces the medium flow resistance coefficient by 30%-50%, reducing pump energy consumption by 10%-20%, while stabilizing flow velocity, avoiding pressure fluctuations, and extending the life of pipelines and equipment.
Installation Flexibility and Adaptability
Free Angle Installation: Can be installed horizontally, vertically (medium flowing upwards), or at an angle, suitable for space-constrained scenarios such as residential piping and equipment rooms.
Wide Diameter Coverage: Mature products are available from DN15 (domestic) to DN600 (industrial), meeting the needs of everything from domestic water supply to industrial circulation systems.
Application Scenarios and Selection Recommendations
Applicable Scenarios
Low-Noise Environments: Residential secondary water supply, hospitals, hotels, office building central air conditioning systems. Systems with high energy-saving requirements: Water supply and drainage, HVAC, and fire protection pipelines. Reduce flow resistance to lower energy consumption.
Clean media systems: Media without particulate impurities, such as tap water, purified water, and ordinary cooling water.
High-temperature/highly corrosive environments: Conventional products are temperature resistant from -10℃ to 120℃, but cannot be used in steam systems (>150℃) or strong acid/alkali media (such as hydrochloric acid and sodium hydroxide solution).
Media containing particulate impurities: Mud, rust, welding slag, etc., can easily cause valve disc blockage or sealing surface wear, requiring the use of a filter.
Low-temperature environments: Below -10℃, rubber seals harden, and the slow-closing mechanism may freeze, leading to seal failure or noise rebound.
Large-diameter, high-pressure systems: Products above DN200 have reduced noise reduction due to large media flow and high velocity, requiring complex hydraulic slow-closing systems, significantly increasing costs.
Key selection parameters:
Material: Stainless steel or alloy steel for chemical workshops; heat-resistant alloy steel for high-temperature steam pipelines.
Flow and Pressure: Determine the nominal diameter based on the pipeline flow rate to avoid excessively fast or slow flow velocities; the nominal pressure must be ≥ the system operating pressure.
Installation and Maintenance: Select horizontal, vertical, or inclined installation methods based on the pipeline layout; when space is limited, prioritize wafer-type connections or compact valves.
Silencing Check Valve Factory
