On which side of the orifice plate is the handle stamped?

The handle of an orifice plate is stamped on the upstream inlet side. This design serves several important purposes in fluid dynamics and instrumentation.

When working with orifice plates, it is important to know the direction of flow, as the proper installation orientation is crucial for accurate flow measurement. Stamping the handle on the upstream side clearly indicates the flow direction. This helps technicians and operators quickly identify how the orifice plate should be installed within a piping system, minimizing the risk of incorrect installation that can lead to inaccurate readings or system inefficiency.

Additionally, having the handle marked on the upstream side ensures that anyone observing the instrument can easily identify the point of higher pressure relative to flow, as fluids are generally at a higher pressure before passing through the orifice. This clear identification supports maintenance, adjustments, and monitoring activities, contributing to the overall effectiveness and reliability of the measurement system in various applications.