The valve eliminates water hammer characteristics. From the principle of generating a destructive water hammer, it is known that there are two main factors for reducing the water hammer boost: the main valve plate is closed when the water flow velocity v just before being cut is as small as possible (close to zero).
1. The water hammer function of the valve is eliminated. From the principle of generating a destructive water hammer, it is known that there are two main factors for reducing the water hammer boost: the main valve plate is closed when the water flow velocity v just before being cut is as small as possible (close to zero). The opening degree of the main valve plate of the multi-function water pump control valve is determined by the impact force of the water flow in the pipe. When the flow rate is high, the main valve plate has a large opening degree: when the flow rate is reduced, the valve plate opening degree is small: when the flow rate is close to zero, the main valve plate is closed. The whole process is consistent with the principle of eliminating the water hammer, so the effect of eliminating the water hammer is very good.
The closing of the pump control valve slow-closing valve plate must be realized after the pressure difference between the upper and lower chambers of the diaphragm controller is realized. After the main valve plate is closed, the slow-closing valve plate can be closed, so that it is impossible to produce a slow closing and a quick closing. The phenomenon of synchronization.
2, the design of the diaphragm. The quality of the diaphragm is a key component that directly affects the valve's use effect and service life. After various screenings, neoprene is used as the raw material, and the middle is strengthened with nylon fiber mesh; the Hunan rubber quality supervision authorized station detects fatigue bending. 650,000 times without cracking, can be used for more than 10 years.
3. The resistance characteristics of the valve. In order to reduce the water flow resistance, the design reduces the weight of the main valve plate, and adopts a streamlined and spacious valve body design. Tested by the Hunan Provincial Hydraulic Machinery Quality Supervision Station, the resistance coefficient of the DN200 multi-function water pump control valve is about 3.8, while the resistance coefficient of the swing-type check valve of the same specification pipe is 5.5.
4. The design of the components of the connecting pipe. The function of the multi-function water pump control valve is to ensure that the valve opening time is greater than the motor starting time, so that the motor is lightly loaded, and at the same time avoiding the water hammer caused by the valve opening speed being too fast. The valve opening time can be set by the control valve according to the field operating pressure. The control valve can adjust the water flow speed of the upper and lower chambers of the diaphragm controller to adjust the slow-closing time; when closed, the diaphragm controller can be repaired; when the pump is in normal operation, the valve can be manually operated to open and close the valve. The filter is to ensure the cleanliness of the water in the upper and lower chambers of the diaphragm controller. Since the water flow is reciprocating in and out during the opening process, it has the function of backwashing, so it can also be used in the case of poor medium.
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