How can I find water deceleration in a pipeline with a check valve?
First, run the Initial Condition analysis and record the velocity in the pipe downstream of the check valve.
Next, run the transient simulation and open the Transient Results Viewer. Plot a time history graph of flow in the pipe downstream of the check valve and measure the time from when the pump turns off until the flow curve crosses the x-axis (i.e., when flow reaches zero).The deceleration of the water column would be the velocity divided by the time. This is an average deceleration rate, which is typically what valve manufacturers provide.
Finding Water Deceleration in Pipeline - Check Valve Slam Analysis
Modeling Reference - Check Valve in HAMMER
Check Valve Dynamic Curve or Reverse Velocity vs. Deceleration Curves for a Check Valve in HAMMER