Micro resistance slow closing butterfly check valve, low water hammer, noise reduction, backflow prevention, universal for large-diameter pipelines

Description :

  Micro resistance slow closing butterfly check valve is an automatic valve installed on horizontal or vertical pipelines, mainly used to prevent medium backflow and eliminate the water hammer effect generated when the pump stops. This valve achieves a two-stage closing action of fast and slow closing through a special hydraulic buffering system, effectively protecting the water pump and pipeline system from high-pressure impact damage. It is widely used in municipal water supply, sewage treatment plants, high-rise building water supply and drainage, and large-scale industrial circulating water systems, especially suitable for working environments with high requirements for noise control and pressure stability. It is an ideal upgraded product to replace traditional swing check valves.

  The main body of the micro resistance slow closing butterfly check valve is usually made of ductile iron or carbon steel casting, and the valve plate is precision machined to ensure the flatness of the sealing surface. Nitrile rubber or EPDM rubber are commonly used as sealing materials, which have good wear resistance and corrosion resistance, and are suitable for room temperature water or non corrosive liquid media. The execution standards generally comply with GB/T 12238 or JB/T 8937 specifications, and the common connection method is flange connection. The pressure rating covers common specifications such as PN10, PN16, PN25, etc. The valve body has a compact structure and a small flow resistance coefficient. It is equipped with an adjustable needle valve inside, which can accurately control the closing speed and ensure that the slow closing action is completed within 0.5 to a few seconds. The specific parameters need to be set according to the actual pipe diameter and working conditions.

  When selecting a micro resistance slow closing butterfly check valve, it is important to consider the properties of the pipeline medium, working pressure, and installation space. For sewage media containing particulate impurities, it is recommended to install filters or choose hard sealed structures to prevent blockages; For large-diameter pipelines, their lightweight design has installation advantages over traditional check valves. Please note that this valve is not suitable for special chemical media that are highly toxic, flammable, explosive, or require extremely high sealing. Compared with ordinary butterfly valves, micro resistance slow closing butterfly check valves add hydraulic cylinders and lever mechanisms. Although the structure is slightly more complex, their performance in preventing water hammer and reducing energy consumption is significantly better than ordinary check valves. When selecting, it should be confirmed that the pipeline flow direction is consistent with the valve identification.

  Before installing the micro resistance slow closing butterfly check valve, the welding slag and debris inside the pipeline should be cleaned to avoid damaging the sealing surface. Valves can be installed horizontally or vertically, but it is necessary to ensure that the actuator is not compressed by external forces. In daily maintenance, it is necessary to regularly check whether the hydraulic cylinder has leaks and observe whether the closing time meets the design requirements by adjusting the needle valve. If it is found that closing too quickly causes water hammer or closing too slowly causes large backflow, the fast and slow closing angles and time need to be readjusted. When the valve is not in use for a long time, it should be kept open and dry. The valve plate should be moved regularly to prevent rusting and jamming, ensuring that it can respond sensitively in emergency conditions and ensuring the safe and stable operation of the pipeline system.

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