Calculating Hydrostatic Force on valve cavity in a Solenoid Valve

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Discussion Overview

The discussion revolves around calculating the hydrostatic force on the valve cavity of a solenoid valve, focusing on how pressure varies within the valve during operation. Participants explore the relationship between valve position, flow, and pressure distribution.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants note that the maximum static pressure in the valve cavity will be less than the static pressure at the inlet while flow is occurring.
  • Others propose that pressure in the valve cavity changes according to the degree of closing and opening of the valve.
  • It is suggested that even when the valve is fully open, pressure will not be constant along the path from port A to port B due to changes in area.
  • Some participants question whether the force on the walls of the valve would remain constant, indicating that it may vary as static pressure changes along the valve path.
  • One participant mentions that as the valve closes and flow is reduced, static pressure becomes more uniform along the path, although at a lower value.
  • For calculations, it is proposed that maximum static pressure occurs at full open flow and is closer to the inlet.

Areas of Agreement / Disagreement

Participants express varying views on how pressure behaves in relation to valve position and flow, indicating that multiple competing perspectives remain without a clear consensus.

Contextual Notes

Participants do not fully resolve the implications of area changes on pressure distribution or the conditions under which static pressure is considered maximum.

jackmrrabbit
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TL;DR
By any chance, can someone help me understand how one would calculate force acting on the walls of the valve cavity? Is pressure usually assumed to be constant? Assuming the fluid is an incompressible fluid. Thank you.
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The maximum static pressure it will have while flowing will be less than the static pressure at the inlet. While flow is passing from port A to port B the pressure will drop through the restriction near the "valve core bottom".
 
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Welcome!
Pressure in the valve cavity should change according to the degree of closing-opening of the valve.
 
Lnewqban said:
Welcome!
Pressure in the valve cavity should change according to the degree of closing-opening of the valve.
If the valve was set to the open position, pressure would still not be constant throughout the path from A to B due to area changes right?
 
jackmrrabbit said:
If the valve was set to the open position, pressure would still not be constant throughout the path from A to B due to area changes right?
Would force be constant?
 
jackmrrabbit said:
If the valve was set to the open position, pressure would still not be constant throughout the path from A to B due to area changes right?
If there is flow when the valve is set to full open, then the pressure will not be constant throughout the path from A to B.
 
jackmrrabbit said:
Would force be constant?
The force on the walls will vary as static pressure varies along the path of the valve.
As the valve closes, and flow is reduced, the static pressure becomes more uniform along the path, but its value is lower.
For your calculation, maximum static pressure should happen at full open flow and closer to the inlet.
 

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