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JD745X Multifunctional Water Pump Control Valve
JD745X Multifunctional Water Pump Control Valve Structure
JD745X multifunctional water pump control valve is suitable for industrial, mining, enterprise, high-rise buildings directly from the water supply and drainage system of the pump, to prevent and reduce the water hammer of the pipeline when the pump is opened and closed, to prevent water backflow, to protect the pump, to maintain the safety of the pipeline, and to have a stop valve , Check valve, electric valve and water hammer eliminator four functions. It is especially suitable for supporting automatic control systems. It does not require an electrical control cabinet and external power. It automatically opens and closes according to the routine. It has three functions of quick closing, slow closing, and energy absorption cavity to prevent and eliminate water hammer, which can effectively improve the safety and reliability of the system. Meet the requirements of system engineering equipment automation control.
- Before the pump starts, the pressure at the valve outlet end acts on the main valve plate, and the valve is in the closed position. At the same time, the upper cavity of the diaphragm controller communicates with pressure water, and the lower cavity communicates with the low pressure at the inlet end of the valve.
- After the pump is started, the pressure at the valve inlet gradually increases, and at the same time, the pressure water slowly enters the lower cavity of the diaphragm controller through the connecting pipe at the valve inlet to realize the slow opening of the main valve plate. The opening speed can be adjusted by the control valve.
- When the pump stops, the pressure at the valve inlet decreases. When the flow is close to zero, the main valve plate closes quickly under its own gravity. As the pressure at the inlet of the valve decreases, the pressure water at the outlet of the valve enters the upper cavity of the diaphragm controller through the connecting tube, and the water in the lower cavity is pressed back to the inlet of the valve through the connecting tube at the inlet of the valve. The slow-closing valve plate closes slowly. Adjusted by control valve. The quick-closing of the main valve plate and the slow-closing of the slow-closing valve plate comply with the two-phase closing rule, which can effectively eliminate water hammer.
- No operational controls are required. The water pressure difference between the valve before and after the pump starts and stops is used as the control power, and it has the function of automatic opening and closing as the pump opens and closes.
- The opening and closing of the valve can effectively prevent accidents caused by the rise of water hammer pressure waves. According to the field usage survey and actual measurement, the peak pressure of the water hammer when the pump is stopped are all within 1.3 times the working pressure.
- No on-site debugging is required, and the applicable working range is wide.
- Maintenance-free. Because one valve replaces three valves, the maintenance and repair workload is greatly reduced.
- Small resistance loss. Adopting streamlined, wide valve body design, resistance loss is reduced by more than 50% compared with similar foreign products. For example, when the DN200 product is operating at an economic flow rate of v = 2m / s, the multi-functional pump control valve loss is 0.7m, while similar foreign products It is 1.5m.
|Design specification||QB / T219|
|Structure length||QB / T219|
|Test and inspection||GB / T13927|
|Flange connection||JB / T79, GB9112 ～ 9131, HG20592, SH3406, ANSI B16.5|
|Product Identification||GB / T 12220|
|Delivery specifications||JB / T 7928|
| Nominal pressure |
| Shell test pressure |
| Seal test pressure |
| Slow closing time |
| Minimum operating pressure |
|Applicable medium|| Medium temperature |
|1.0||1.5||1.1|| 3-60 |
|Part Name||Parts material|
|Body valve cover||HT200, QT350, WCB|
|Valve seat||Copper alloy / 2Cr13|
|O-ring seal||Nitrile rubber|
|Cylinder liner piston (piston type)||2Cr13|
|Diaphragm (diaphragm type)||Fabric with nitrile rubber|
|Regulating valve||Copper alloy|