Multifunctional pump control valve in the pump station automation application

Currently in the water plant level, two pump stations, pump outlet equipped with two-speed valve and manual gate valve in the urban pressure station in the water pump equipped with micro-slow closing check valve and manual butterfly valve , Through the years of operation, the main problems are: two-speed valve opening and closing is not flexible enough, electromagnetic four-way valve failure rate is relatively high, can not meet the pump station automation requirements; slow closing check valve stroke is difficult to debug Grasp, and therefore often appear slow closure check valve closed lax pump reverse phenomenon, such as hydraulic maintenance and maintenance more troublesome. In 2001 l0 months, the company in Yihe North pumping station switch to Zhuzhou South Valve Manufacturing Co., Ltd. production of "multi-function pump control valve", the more ideal solution to the above problems, improve the reliability of water supply safety, to achieve the pump Automated operation of the station. First, the multi-functional pump control valve Introduction JD745X series of multi-function pump control valve is a new type of automatic operation of the whole process of hydraulic valves to fully automatic centrifugal pump to open the pump when the slow open, Slow closing to prevent media backflow in the pipe, the valve can simultaneously replace the pump outlet pipe on the operation of the valve, two-speed valve, slow closing valve check valve water hammer eliminator. Second, the design of several major features 1. The main valve plate and the stem to form a sliding fit, the valve plate opening with the size of the flow can change, which can be close to zero flow close, to eliminate the ideal state of water hammer. 2. The diaphragm is designed in the control chamber to avoid the switch failure caused by the resistance in the piston-cylinder control chamber. At the same time reduce the pressure on the action, the diaphragm material first reinforced nylon fiber reinforced neoprene, action life of up to 650,000 times. 3. Less than the Swing Check Valve 31% of electricity consumption, reducing the design of the main valve plate weight, using a streamlined spacious seat design, the drag coefficient of 3.8, significantly lower than the drag coefficient of 5.6 Gyreck valve. 4. Easy maintenance, using a wide bonnet, without removing the connection flange, you can remove all valve components. Third, the operating data Pump Type 8Sh a 6A Motor 90KW Rated speed 2950r / min Head 83m Flow 224m3 / h Test conditions: 1. The control valve automatically opens for 30 to 40 seconds and automatically closes for 10 to 15 seconds. 2. After the pump valve reaches the maximum opening in 2min. Fourth, the use of effect Our water division in October 2000 to use the normal operation of the product for 5 months, accumulated more than 2000 hours without any failure, showing that the valve operating conditions are very stable. 1. Centrifugal pump to meet the closing brake requirements to ensure that the pump motor light start, without electricity and hydraulic pressure, can be achieved directly on the pump start and stop control, not only completely resolved due to a sudden power outage caused by the pumping medium on the pumping system The resulting water hammer impact, media backflow, but also greatly reduce the labor intensity of workers. 2. Elimination of water hammer ideal effect, stop the pump when the valve off a smooth silent, vibration, close the valve tight, because this control valve relies entirely on hydraulic self-control, so no special management.