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This post was last edited by 845552188 on 2019-9-5 at 12:43. Installation instructions (with diagrams) for self-priming magnetic pumps. Operating conditions for self-priming magnetic pumps: 1. When a self-priming magnetic pump is used in self-priming mode, there is no need to install a bottom valve at the bottom of the pump’s inlet pipe; the pump chamber must be filled with the liquid to be transported before starting the pump. An outlet valve must be installed at the outlet of the 2 pumps to regulate the flow rate. If a check valve is installed on the outlet pipe, an exhaust pipe must be provided below the check valve. 3. The self-priming height for this operating condition can be calculated simply by using the self-priming height for clean water, which is 3 meters. The density of the medium being transported determines the actual self-priming height; for example, for 98% sulfuric acid, the self-priming height is 3 meters, and 184 = 163 meters. The density of 98% sulfuric acid is 184*10^3 kg/m3. Regarding the backflow operation of self-priming magnetic pumps: http://www.dsc86.com/newsdetail_1885960.html. When a self-priming magnetic pump is used in backflow conditions, an inlet valve must be installed at the pump’s inlet to allow for easy closing of the valve during maintenance, thereby preventing the liquid in the tank from leaking out. An outlet valve must be installed at the outlet of the 2 pumps to regulate the flow rate (it is not allowed to use the inlet valve for this purpose). 3. In this operating condition, there is no self-priming process; the pump can be started directly (with the valve closed) to enter operation mode. Precautions for using self-priming magnetic pumps: 1. Self-priming magnetic pumps must not be operated without liquid; the minimum flow rate required for the pump to operate is 30%–35% of its maximum efficiency point. 2. Self-priming magnetic pumps must not be used to transport media containing solid particles or substances that tend to crystallize. 3. Self-priming magnetic pumps cannot transport media that generate a large number of bubbles, nor can they transport gas-liquid mixed media. 4. When a self-priming pump is in operation, cavitation must not occur; if it does, the liquid must be refilled so that priming can take place again. Therefore, the user must have a device to control the minimum liquid level or assign someone to monitor it, in order to prevent the medium in the tank from being drawn down to zero. 5. The self-priming height is below 3 meters; if the self-priming time exceeds 5 minutes and the system does not discharge liquid properly, stop the machine to check the pipelines and pump, otherwise the pump will be damaged. 6. When using the pump after a long period of inactivity, check before starting whether there is sufficient liquid inside the pump; if not, add more liquid before attempting self-priming. Suction magnetic pump pipeline: 1. The inlet pipeline of the pump should be located as close as possible to the water tank. 2. The diameter of the pump’s inlet pipe must not be larger than the specified value, and the total length of the inlet pipe shall not exceed 5 meters; the shorter it is, the better, provided that the requirements are met. A filter should be installed at the bottom of the inlet pipe to prevent large particles or debris from entering the pump and damaging the impeller or affecting its operation; the filtering area should be 3 to 4 times larger than the cross-sectional area of the pipeline. 3. The liquid outlet pipeline of the pump must be equipped with a valve to regulate the flow rate, ensuring that the pump operates at the specified flow rate and preventing it from overloading due to excessive flow. The diameter of the liquid outlet pipe must not be smaller than the specified requirements; ideally, the larger the diameter of the liquid outlet pipe, the better. The total length of the liquid outlet pipe must be more than 1.5 times the total length of the liquid inlet pipe; it’s better if it is longer whenever possible. 4. When the pump is used in backflow conditions, air valves and check valves must not be used; in such cases, these valves should be removed. 5. No check valve shall be installed on the pump outlet pipeline; if one is present, an exhaust device must be installed below the check valve. Installation of self-priming magnetic pump: 1. The pump must be installed and fixed on a stable base, free from influence by other mechanical vibrations. The weight of the foundation itself is more than 3 times the mechanical weight; its area must be larger than that of the base. The pump unit is placed on the foundation, and a cushion should be placed between the base and the foundation. Sufficient space should be reserved around the pump to facilitate its repair and maintenance. 2. When installing the inlet piping, there should be no upward bends in the pipes, to prevent air bubbles from forming inside them and affecting the performance of the pump. 3. When installing the pump, the pipes connected to it should be cleaned, and separate supports should be provided for the inlet and outlet pipes; the weight of the pipes must not be supported by the pump itself. 4. When installing the pipeline, connect the inlet pipe first; fill it with liquid before connecting the outlet pipe. Alternatively, add liquid from the pump’s outlet pipe, making sure to remove any air from the pipelines and the pump chamber during this process. 5. All connections of the inlet and outlet pipes must be tight to prevent air leakage; otherwise, it will affect the self-priming function and the proper operation of the pump. 6. When the pump is used in suction mode, an outlet valve must be installed on the pump’s outlet ； When the pump is used under backflow conditions, valves must be installed at both the inlet and outlet of the pump. Pipe compensators should be installed as much as possible at the pump’s inlet and outlet to facilitate maintenance. Starting a self-priming magnetic pump: 1. After the piping installation is complete, connect it to the power supply. In the suction mode, the liquid to be transported is drawn into the pump ； In the backflow condition, open the inlet valve to supply the liquid source, and use the jog mode to check whether the pump rotates smoothly and whether its rotation direction matches the direction indicated by the pump’s orientation marker. 2. For the priming operation, open the outlet valve to 1/3–1/4, and then the pump can be started (that is, start it with the valve open). After the pump completes the priming process (the priming time varies depending on the piping), gradually adjust the outlet valve to bring the pump to the specified flow rate range. 3. In the backflow condition, close the outlet valve (that is, start the pump with the valve closed), then start the pump directly, and subsequently open the outlet valve while adjusting its opening degree to ensure that the pump operates within the specified flow rate range. 4. Run the unit for 5–10 minutes; if no abnormalities are observed, it can be put into normal operation. Operation of self-priming magnetic pumps: It is strictly prohibited to use closing or adjusting the inlet valve to control the flow rate, in order to avoid damage to the impeller and other components. 1. When the installed head of the pump is less than its rated head, reduce the opening of the outlet valve to bring the flow rate to the rated value; if the outlet valve is fully open, the flow rate will be higher than the rated value. Operating at such parameter settings can easily cause the motor to overload, which is unsafe. 2. During operation, if abnormal noises or other faults are detected, the machine must be stopped immediately for inspection; it can only be restarted after the fault has been resolved. Shutting down a self-priming magnetic pump: 1. When shutting down, first close the outlet valve, then cut off the power supply, and finally close the inlet valve. 2. Keep the outside of the pump and its surrounding area clean. When flushing with water, prevent the motor from getting wet; after flushing, wipe away any water residue from the pump using a cloth. 3. If the pump is located outdoors, rain protection measures should be taken to prevent the motor from getting wet and burning out. 4. After shutting down the machine, if the ambient temperature is below the freezing point of the transport medium, the liquid inside the pump must be completely drained to prevent freezing and cracking. 5. When the pump will not be used for an extended period of time, the power supply should be disconnected, the flow channels inside the pump should be cleaned, and they should be rinsed thoroughly with clean water. In particular, the sealing components need to be carefully cleaned, and the inlet and outlet of the pump should be sealed properly before it is stored safely. Before restarting, check whether there is sufficient liquid in the pump chamber; if not, top it up before self-priming can occur and normal operation can be achieved. Note: For specific operating procedures, please refer to the user manual.