Can the outlet pipeline of a centrifugal pump be without a control valve?
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Case: There is currently a TCM system, consisting of a centrifugal pump and a heat exchanger. On the cooling water side, the centrifugal pump and the heat exchanger form a circulation loop; (there are also pipes connected to the main cooling water pipeline, with manual ball valves on both the inlet and outlet pipes.) ) But there are no manual valves on that circuit. Question: 1. There is no on/off valve on the pump outlet pipeline; can the centrifugal pump be started? (In normal operating procedures, it is required to close the outlet valve at startup.) 2. The maximum shaft power of the centrifugal pump is 2.5 kW, while the maximum power of the motor is 3 kW; is the motor safe? I’m new to Haichuan; I hope everyone can offer me a lot of guidance!
Generally, a valve is installed at the outlet of a centrifugal pump. Firstly, the pump needs to be started with the outlet valve closed; secondly, it facilitates flow control; and thirdly, it helps to cut off the flow of material during pump maintenance. However, for independent small pumps such as those used for clean water, it is possible to start them directly without installing an outlet valve, though this situation is rare.
The rated shaft power is 2.5; a 3.0 motor can just work. But you need to see what the shaft power at maximum flow is. Because, if no valves are installed on the outlet pipeline, it is equivalent to the maximum flow rate. The greater the flow rate, the higher the shaft power. Installing an orifice plate can also limit flow.
2.5 is already the maximum power; the rated power is 2.1