Pump industry suppliers - Automatic self-priming pump FAQ

Small make up today give you a brief introduction of self-control self-priming pump solution to a common question:

1, q: self-priming pump does not leak at run time, downtime starts again began to leak, why? How to solve? A: self-priming pump in the long term stable operation of automatic control and mechanical seal ring and static ring formed between a consistent track. stop leaking after restart may be because of two reasons: 1. Mechanical seal spring compensating force is insufficient, can't make the mechanical seal ring and static ring clamp fully; 2. Ring and static ring can no longer return to the original track. Can let the water pump in the case of leakage, running 12 hours continuously, could gradually don't leak, or need to replace the mechanical seal. 2, q: why must close the outlet valve control self-priming pump start? A: automatic self-priming pump must closing valve pump, is to make the pump light load startup. To prevent the starting current is too large, cause the motor trip. Close the outlet valve, start the pump, stable running, gradually open the outlet valve slowly, to achieve the required pressure, observe the running current at the same time, make its rated current range. 3, ask: why submersible pump must close the outlet valve parking? Answer: the pump in the process of running, pipe has certain pressure. If not close stop pump outlet valve, the pressure inside the pump suddenly dropped to zero, will be under pressure of the water in the pipe and return water pump, causing & quot; Water hammer & quot; Phenomenon. Impeller of pump, mechanical seals, bearing bushing, key and keyway on the shaft and bearing has a certain impact, cause certain harm, will shorten the service life of the above parts. A non-return valve, will harm the non-return valve, will hear a big impact. 4, q: automatic control of self-priming pump outlet valve can open 30%, or running current would be beyond the rated current. Why is that? How to solve? A: automatic self-priming pump selection deviates from the actual operation condition is too much, the main pump head is chosen. Can be calculated to solve the cutting after cutting impeller diameter. 5, q: automatic control of self-priming pump outlet valve can open 20%, if continue to open the outlet valve surge occurs. Why is that? How to solve? A: automatic self-priming pump selection deviates from the actual operation condition is too much, mainly is the flow of water pump to choose. Can only be run down the valve. Either replacing suitable types of pumps. 6, ask: why per shift records to fill water, pond water level, and calculate the water supply. Answer: the system running parameters state of reaction system in a certain sense, each class records to fill water, pond water level, and calculate the water supply, can be used to detect whether the system is in normal state, the water meter in case of problems, for example, we can timely found that from losses to the company. Monitor factory operation level, promote the coordination to save water. 7, q: daily patrol the main points of the circulation pump is what? Answer: patrol the main points of the circulating pump: 1. Look, pressure is within the normal range, pump body, pipeline accessories if there is a leak; 2. Listen, the motor sound, water pump bearing abnormal voice whether; 3. Touch, water pump bearing place whether fever, motor bearing whether fever. 8, ask: what is the pump's 'surge' phenomenon? How to solve? Answer: the pump in the process of running smoothly, the outlet valve to keep a certain opening. When the water cut, pump body will send out the voice of water hit back and forth, non-return valve indicates the swinging rod have small amplitude. Is mainly due to the supply of the system. Turn down the pump outlet valve, 'surge' phenomenon can be eliminated. 9, q: pump body of water and turning order matter? Why is that? Answer: the pump body of water and turning order is important. Must first after irrigation, the plate of the car, because the pump body filled with water, after turning again, can make the water into the mechanical seal face, have the effect of cooling lubrication, prevent mechanical seal damage suddenly start. 10 q: how to arrange the operation of the submersible pump and standby pump? Why is that? A: for long-term stable operation of the pump, in principle not for artificial active switching operation of the running pump and standby water pump. Only when the running pump need downtime for maintenance or repair, natural to switch. Because water pumps, especially large pumps, start in, stop in for mechanical seal, shaft, bearing bushing, key in the keyway, bearing has a certain impact, if frequent start-stop pumps, will shorten the service life of the above parts. Secondly, in the process of the water pump in the long run, must be formed between mechanical seal ring and static ring close orbit, after stop, start the pump again, may be the cause of orbital cannot match, lead to mechanical seal leakage and need to be replaced. 11, q: to what maintenance spare pump should be? Time how to arrange? A: in the standby state of the pump shall be carried out once a month the following maintenance work, barring a few laps, make the mechanical parts of motion of the pump body; Exhaust check whether the water pump body is filled with water, make sure the standby pump can start at any time, especially large pumps, because the irrigation pump for a long time; Rotation number of inlet and outlet valve ring to prevent long-term use, rust. Every 2 months shall check the oil level of bearing.

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