â… ï¼ŽProduct Introduction
The Cast Iron Swing Non Return Valve is a vital fluid control component designed to prevent reverse flow in pipelines, ensuring the one-way circulation of media and protecting downstream equipment from potential damage caused by backflow. Constructed with high-quality cast iron, this valve boasts excellent mechanical strength, corrosion resistance, and wear resistance, making it suitable for a wide range of industrial and municipal applications.
Its core working principle relies on the swing of a disc (flap) driven by the pressure of the medium. When the medium flows in the forward direction, the pressure pushes the disc open, allowing unobstructed flow; when the medium tends to flow backward, the reverse pressure and the weight of the disc itself cause the disc to quickly close against the valve seat, thereby cutting off the reverse flow path. This simple yet reliable structural design ensures stable operation even in harsh working environments, with low maintenance requirements and a long service life.
Common application scenarios include water supply and drainage systems, heating pipelines, ventilation and air conditioning (HVAC) systems, industrial circulating water systems, as well as some low-pressure steam and gas pipelines. It is an essential valve type for maintaining the normal and efficient operation of pipeline systems.
Ⅱ．Product Features
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Superior Material Performance: Adopts high-grade cast iron (such as gray cast iron, ductile iron) as the main body material, which has good casting performance, high hardness, and strong resistance to atmospheric corrosion and general chemical media corrosion. The material meets relevant international and national standards, ensuring the overall structural stability and durability of the valve.
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Reliable Backflow Prevention: The swing disc structure is matched with a precision-machined valve seat, ensuring tight sealing when closed. The disc closes quickly under the combined action of reverse medium pressure and its own weight, effectively preventing backflow and avoiding water hammer phenomenon, thus protecting pumps, meters, and other equipment in the pipeline.
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Low Flow Resistance: The streamlined internal flow channel design minimizes the obstruction to the medium flow, reducing pressure loss and energy consumption. Compared with other types of check valves, it has lower flow resistance coefficient, which is conducive to improving the overall efficiency of the pipeline system.
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Simple Structure & Easy Installation: The overall structure is compact and lightweight, with fewer internal components, which simplifies the installation process. It can be installed horizontally or vertically (depending on the model), and the connection methods (such as flange connection, threaded connection) are diverse, adapting to different pipeline installation requirements.
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Low Maintenance Cost: The key components (disc, valve seat) are wear-resistant and corrosion-resistant, with a long service life. In daily use, only regular inspection of the sealing performance and disc swing flexibility is required, and parts replacement is simple and convenient, greatly reducing maintenance time and cost.
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Wide Operating Range: It can adapt to a wide range of medium temperatures and pressures (specific parameters refer to technical data). It is suitable for various media such as clean water, sewage, industrial circulating water, low-pressure steam, and neutral gas, and has strong versatility.
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Stable Operation & Low Noise: During the opening and closing process, the disc swings smoothly without obvious impact, resulting in low operating noise. It can maintain stable performance even in long-term continuous operation, ensuring a quiet working environment.
Ⅲ．Technical Data
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Item
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Specification
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Valve Body Material
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Gray Cast Iron (HT200/HT250), Ductile Iron (QT450-10/QT500-7)
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Disc Material
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Cast Iron, Cast Steel, Stainless Steel (304/316) (optional according to medium)
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Valve Seat Material
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Nitrile Rubber (NBR), EPDM, PTFE, Metal (optional according to medium and working conditions)
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Nominal Diameter (DN)
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DN15 – DN600 (customizable for special specifications)
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Nominal Pressure (PN)
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PN1.0, PN1.6, PN2.5 (MPa)
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Working Temperature Range
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-20℃ – 200℃ (specific temperature depends on the material of valve seat and disc)
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Applicable Medium
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Clean water, sewage, industrial circulating water, low-pressure steam, neutral gas, oil (excluding strong corrosive media)
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Connection Method
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Flange Connection (GB, DIN, ANSI standard), Threaded Connection (for small diameter DN15 – DN50)
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Installation Direction
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Horizontal installation (preferred), Vertical installation (upward flow direction)
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Sealing Performance
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No leakage under the specified test pressure (conforms to GB/T 13927 or API standard)
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Pressure Loss Coefficient
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≤0.8 (tested under standard working conditions)
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Ⅳ．The main shape and connection size
