Multi functional water pump control valve with slow closing noise reduction check cast iron flange connection

Description :

  Multi functional check valve is a new type of hydraulic control valve that integrates the functions of electric gate valve, electric butterfly valve, and check valve. It mainly solves the water hammer hazard and medium backflow problem during the start and stop of water pumps. This valve is widely used in high-rise building water supply and drainage systems, fire protection pipelines, and industrial circulating water systems. It can effectively protect water pump units from reverse pressure shocks and ensure the safe and stable operation of pipeline systems. Through hydraulic automatic control, the action logic of slow opening and fast closing or fast opening and slow closing can be achieved, significantly reducing pipeline vibration and noise. It is an indispensable key control component in modern fluid transportation systems.

  The main body of this multifunctional check valve is usually cast with high-strength gray cast iron or ductile iron, and the internal valve plate is precision machined and treated with anti-corrosion to ensure long-term sealing and durability. The execution standards follow relevant national machinery industry standards such as GB/T 12236 and JB/T 8937, and the flange connection dimensions comply with GB/T 17241.6, suitable for common nominal pressure levels PN10, PN16, and PN25. The valve body structure is compact, and the flow channel design is optimized to reduce local resistance losses. The key sealing parts adopt a combination of hard alloy or rubber soft seals, which are suitable for various medium working conditions such as clean water and non corrosive liquids. The working temperature range is usually between 0-80 degrees Celsius, meeting most conventional fluid control requirements.

  In the selection process, specific specifications should be determined based on the nominal diameter, working pressure, and installation space of the actual pipeline system. Multi function check valves are suitable for horizontal installation, and if used in vertical pipelines, special flow requirements should be specified. Compared with ordinary rotary check valves, its advantage lies in eliminating the impact sound when closing and having flow regulation function; Compared with electric valves, they do not require external power to drive and rely on the pressure of the medium to operate, resulting in a lower failure rate. Not suitable for sewage media containing a large amount of solid particles or fiber impurities, in order to avoid blocking the control pipeline or wearing the sealing surface. It is recommended to use sewage type special valves or install filters for such working conditions.

  Before installation, the welding slag, stones, and other debris inside the pipeline should be thoroughly removed to prevent blockage of the valve plate and poor closure. During the debugging phase, it is necessary to adjust the opening of the throttle valve on the control pipeline to set an appropriate closing time, which is usually divided into two stages: fast closing and slow closing, in order to balance the effect of eliminating water hammer and preventing medium backflow. During daily maintenance, it is necessary to regularly check whether there is any leakage outside the valve body, monitor whether the operating sound is abnormal, and clean the control pipeline every six months to one year to prevent dirt deposition from affecting the sensitivity of the operation. If it is found that the closing is not tight or the action is slow, it is often caused by impurities jamming or spring fatigue. It is necessary to disassemble, clean or replace the corresponding components to restore performance.

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