1, the valve to eliminate water hammer characteristics. From the principle of generating destructive water hammer, it can be known that there are mainly two factors to reduce the water hammer boost: shut off the main valve plate when the water flow velocity v just before being cut off is as small as possible (close to zero). The opening of the main valve plate of the multi-function pump control valve is determined by the impact force of the water flow in the pipeline. The main valve plate opens at a high flow rate. When the flow rate decreases, the valve plate opening degree is small: when the flow rate approaches zero, the main valve plate closes. The whole process is consistent with the elimination of the principle of water hammer close fast, so the elimination of water hammer works well. Pump control valve slow closing valve plate must be formed in the diaphragm control chamber pressure difference before and after the cavity can be achieved, that is, the main valve plate is closed, the slow closing valve plate can only be closed, it is impossible to produce slow closing and quick closing Synchronization phenomenon. 2, the design of the diaphragm. The quality of the diaphragm is a key component that directly affects the valve effect and service life. Through a variety of screening, the neoprene is used as the raw material, and the middle is reinforced with the nylon fiber mesh. The fatigue test is carried out by Hunan Rubber Quality Supervision and Quarantine Bureau 650,000 times without rupture, can be used for more than 10 years. 3, the valve resistance characteristics. In order to reduce water flow resistance, the design reduces the weight of the main valve plate, while using a streamlined spacious body design. The Hunan Hydraulic Machinery Quality Supervision authorized station test, DN200 multi-function pump control valve resistance coefficient of about 3.8, while the same specifications of the pipe swing check valve resistance coefficient of 5.5. 4, connecting pipe parts design. The function of the multi-function pump control valve is to ensure that the valve opening time is greater than the motor start-up time, so that the motor light load start; the same time to avoid opening the valve caused by too fast to open the pump water hammer. Valve opening time by the control valve according to field conditions pressure settings. The control valve can adjust the water flow speed of the upper and lower chambers of the diaphragm controller so as to adjust the slow closing time; the diaphragm controller can be repaired when the valve is closed; and the valve can be manually operated when the pump is in normal operation. The filter is to ensure the cleanliness of the water in the upper and lower chambers of the diaphragm controller. As the valve in a process of opening and closing the water is reciprocating access, itself has the role of backwash, it can also be used for poor medium conditions.
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