Pressure changes in the positive and negative pressure chambers when the orifice plate is installed reversely

When properly installed, the orifice plate has its throat facing the direction of fluid flow. The fluid contracts locally at the orifice center, which increases the flow velocity and reduces the static pressure; as a result, a static pressure difference is created before and after the orifice, and this pressure difference is in a certain functional relationship with the flow rate. When the orifice plate is installed in the reverse direction, its inlet end face assumes a conical shape. As a result, the degree of contraction of the fluid as it passes through the orifice plate is less compared to when it is installed correctly; moreover, the point where the flow stream narrows is located further away from the orifice plate than in the correct installation. The velocity of the fluid as it passes through the rear end face of the orifice plate is also lower than in the correct installation, which leads to a higher pressure behind the orifice plate. This in turn reduces the static pressure difference across the orifice plate, resulting in a decrease in the flow rate and affecting the accuracy of flow measurement.

It was explained very clearly upstairs~ Great. In short, the differential pressure value will decrease