It is actually possible to install the butterfly valve at the outlet of the centrifugal pump. The butterfly valve flow characteristics are approximately linear. It has good conditioning properties. It opens and closes at 90°. The switch is quick and effortless. The structure is simple and the sealing performance is good. It is feasible to use at the centrifugal pump outlet. However, one thing we need to pay attention to is that if the butterfly valve is installed at the outlet of the centrifugal pump as a shut-off valve, a check valve must be added behind the butterfly valve. Because only the use of butterfly valves can not prevent the backflow in the pipeline. As a shut-off valve, the sealing of the butterfly valve is not as good as the full-bore valve ball valve and gate valve.
Although the butterfly valve can also be used as a shut-off valve, it is not as good as the full-bore valve ball valve and gate valve. Moreover, it is necessary to frequently open the butterfly valve when installed at the outlet of the centrifugal pump, so that the sealing property cannot be guaranteed. Butterfly valves are also not suitable for too high a pressure. A butterfly valve is usually added to the water delivery pipe. If it is installed at the pump outlet it is also installed at a lower pressure pump port.
In fact, the use of butterfly valves instead of gate valves installed in the pump port is also advantageous. For example, if a gate valve is installed, the valve is closed before the pump is turned off, and the valve is closed before the pump is turned off, so the valve plate is much stressed. In this case, the sealing surface of the gate valve is seriously worn. If it is a soft sealing gate valve, it is easier to cause the gate rubber to grind on the groove, and the damage is faster. We know that the butterfly valve is designed for through-axis, with uniform force and 30% opening. If a butterfly valve is used, the flow rate can reach 80% or more. Although the sealing of the butterfly valve is not as good as the gate valve, it is good if a good quality butterfly valve is used.
Therefore, the butterfly valve can be installed at the outlet of the centrifugal pump. However, the necessary conditions are as follows: the pump port pressure is not particularly large. And the check valve needs to be installed after the butterfly valve. The purpose of this is to ensure that the butterfly valve is well sealed when servicing the pump. If the butterfly valve is not tightly closed, the check valve can also effectively prevent the medium from flowing backwards and effectively prevent the water hammer. Now, the Bundor valve is also selling a butterfly check valve, which is more worry-free for companies in need. For more information, please contact us.