When using the pipeline pump will encounter the need to adjust the flow of time, the following by our pipeline pump manufacturers in Shanghai Weihu pump for everyone to talk about what methods to adjust the pipeline pump flow.
When this method is used to regulate the flow rate, the required power can be reduced to a minimum, and an overheating in the flow regulation process can be eliminated. Steam turbines and internal combustion engines easily adapt to speed regulation at very little additional cost. A variety of mechanical, magnetic, hydraulic transmission and DC and AC variable speed motors can be used to adjust the speed. In general, variable speed motors are too expensive and can only be adjusted with adjustable blades only after economic studies have been done for special cases.
Second, bypass regulation
All or part of the flow may be diverted from the discharge line of the pipeline pump through the bypass line to the suction port of the pump or other appropriate point. The bypass can be equipped with one or more flow orifice plates and a suitable control valve. Metering bypass is usually used to reduce the boiler feed pump flow, mainly to prevent overheating. Substantial power savings can be achieved by bypassing the surplus flow of the propeller pump to replace the outlet throttling.
Third, exports throttle
This is one of the most common and inexpensive flow adjustment methods for low- and medium-specific speed pumps. Usually this method is also limited to low, medium speed than the number of pumps used. Partially closing any type of valve on the outlet line will increase the system head so that the system head curve will intersect the pipe pump head curve at a lower flow rate. The outlet throttling moves the operating point to a lower efficiency point and has a power loss at the throttle valve. This may be important for large-scale pump installations, and a higher investment adjustment method may be more economically attractive. Throttle to the dead point may cause fluid overheating in the pump, bypass can be used to maintain the necessary minimum flow, or a different adjustment means. This is very important for the pumps mentioned above for the treatment of hot or volatile liquids.
Fourth, the intake throttling
If there is sufficient NPSH available, then the suction line can be throttled by saving some power. Because the throttling of the outlet can cause the liquid to overheat or vaporize, the jet fuel pump often uses inlet throttling. At very low flow, the impeller of these pumps is only partially filled with liquid, so the input power and temperature rise is about throttle exhaust throttle full operation bit 1/30 condensate pump flow is usually used to control the depth of submergence 7, This is equivalent to the entrance throttling. Special designs can reduce the cavitation damage of these pumps to a negligible extent, but the energy levels also become quite low.
Fifth, qi
Air intake to the suction line of the pump is also a method of regulating the flow rate, this method can save some power compared with the output throttle. In general, it is not desirable to have air present in the delivered liquid and too much air always has the risk of the pump losing its priming head, so this method is rarely used in practice except in a few cases.
If you want to buy pipeline pump can contact us Weihu pump, our company is specialized in various types of pump manufacturing and computer control of water supply and drainage complete sets of equipment manufacturers to operate the pump-based products related to general motors, pumps and other related accessories.
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