1. Water Hammer Elimination Function. Based on the mechanism behind destructive water hammer, it's clear that minimizing the water flow velocity before the valve closes is crucial in reducing pressure surges. The opening degree of the main valve plate in a multi-function water pump control valve is determined by the impact force of the flowing water. When the flow rate is high, the valve plate opens wider; when the flow decreases, the opening becomes smaller; and when the flow approaches zero, the main valve plate fully closes. This process aligns perfectly with the principle of water hammer elimination, resulting in highly effective performance.
2. The slow-closing mechanism of the pump control valve must be activated only after the pressure difference between the upper and lower chambers of the diaphragm controller is established. Once the main valve plate is closed, the slow-closing plate can then close, preventing any synchronization issues between fast and slow closing actions.
3. Diaphragm Design. The quality of the diaphragm plays a critical role in determining the valve’s performance and longevity. After extensive testing, neoprene was selected as the primary material, reinforced with nylon fiber mesh for added strength. The Hunan Rubber Quality Supervision Station tested the diaphragm for fatigue bending and found it could withstand over 650,000 cycles without cracking, ensuring a service life of more than 10 years.
4. Valve Resistance Characteristics. To minimize water flow resistance, the design reduces the weight of the main valve plate and incorporates a streamlined, spacious valve body. According to tests conducted by the Hunan Provincial Hydraulic Machinery Quality Supervision Station, the resistance coefficient of a DN200 multi-function water pump control valve is approximately 3.8, compared to 5.5 for a swing-type check valve of the same size.
5. Pipe Connection Component Design. The function of the multi-function water pump control valve is to ensure the valve opening time exceeds the motor start-up time, allowing the motor to operate under light load conditions and avoiding water hammer caused by rapid valve opening. The opening time can be adjusted via the control valve according to field pressure conditions. The control valve can also regulate the flow speed in the upper and lower chambers of the diaphragm controller to adjust the slow-closing time. In case of maintenance, the diaphragm controller can be repaired without removing the entire system. During normal operation, the valve can be manually operated for opening and closing. A built-in filter ensures clean water in both chambers of the diaphragm controller. Since the water flows back and forth during the opening process, the valve also has a self-cleaning (backwashing) function, making it suitable for use in environments with poor water quality.
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