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So, I'm designing a basic downhole hydraulic tool cutter of an OD = 5 1/2 in., and my tool contains a relief valve and a piston. I am trying to calculate pressure drop across the relief valve so that I can calculate the force on piston that activates the knives. Please help me how can I achieve this. Q, flow rate = 30 L/s Pressure = 25 MPa

I haven't completed the drawing yet, but I'm referring to this design. I was suggested to add a valve and a spring. enter image description here

Karima Zafar
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    A drawing or sketch of the system wtih relavant dimensions would be helpful. – J. Ari May 17 '20 at 15:13
  • Have you used a standard orifice calculation formula and found that it is wrong? – J. Ari May 19 '20 at 21:21
  • @J.Ari I found how to calculate it, but I am a bit confused. If I'm adding a valve, and a nozzle in the piston, am I supposed to calculate the pressure drop across the valve or the nozzle? And where should I actually place the valve? between the piston and the top sub? It's a bit confusing for me... I really hope you can suggest me something on that. – Karima Zafar May 25 '20 at 12:24
  • Do you have a sketch of the actual device showing the new and existing parts? We also need to know the fluid paths and the dimensions of the various fluid paths. – J. Ari May 25 '20 at 13:46

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