Check the amplitude of any highly excitational pressure spikes in pump literature aka "Velocity Jump" causing "Joukowsky shock"
You can reduce Velocity Jump Shock to a generally insignificant figure in 4 steps:
1. Select a damper with an ID 12 times the diameter of the inlet connection.
2. Have an outlet 1/2 the area of the inlet.
3. Increase the volume by 3 x the in-efficiency.
4. Decrease the cushion pre-fill pressure proportionately to the volume increase, from 80% of system pressure to as low as 50%.