How to determine the inlet and outlet of a pump

Based on the selection direction and the direction of the inlet and outlet volutes, if the rotation direction is the same as that of the volutes, it is the inlet; if the rotation direction is opposite to that of the volutes, it is the outlet

I agree with what was said on the second floor; that’s how I judge it as well

1. The diameter of the pump outlet pipe is generally smaller than that of the inlet pipe； 2. Regarding the motor direction with respect to the pump, the inlet is generally located at the lower right part of the pump head ； 3. Generally, export versions are equipped with pressure gauges, check valves, drain valves, etc ； 4. If it is not installed, the outlet can be seen at the flange where the impeller is located ； 5. If one of the pump’s inlet and outlet is axial and the other is radial, then the axial one is the inlet and the radial one is the outlet ； 6. If both the inlet and outlet of the pump are radial, then looking from the motor side toward the pump, the left side is the inlet and the right side is the outlet ； 7. Generally, pump manufacturers will indicate the rotation direction of the pump on its body; the direction indicated by the arrow is the outlet, while the opposite direction is the inlet. Issues with the size of the inlets and outlets of pumps and the pipes connecting them

Based on the selection direction and the direction of the inlet and outlet volutes, if the rotation direction is the same as that of the volutes, it is the inlet; if the rotation direction is opposite to that of the volutes, it is the outlet

The rotation direction of the impeller is consistent with the expansion direction (from small to large) of the volute in the water chamber, so that the fluid inside the volute can flow out properly； Also, the rotation direction of the water pump is opposite to the bending direction of the blades