4 way directional control valve port dimensions

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Paraic OKelly
Paraic OKelly on 2 Mar 2016
Answered: Yifeng Tang on 29 Jun 2022
Hello, I am modelling a double acting hydraulic cylinder which is located on the seabed. I am using a 4 way directional control valve to facilitate the function. I have also inverted a Hydraulic Constant Pressure Source to simulate hydrostatic pressure at water depth. This is connected to the "T" port on the directional control valve as the function vents to sea. Does the value I set as the Valve Passage Maximum Area in the parameterisation of the directional valve also apply to the dimensions of the ports themselves? So, for example, if I set the maximum passage area to 5e-4 m^2 does this also mean the hydrostatic pressure acts on an area of 5e-4 m^2 (which would be the "T" port area) ?
Many thanks,
  1 Comment
Eric Money
Eric Money on 9 Jun 2016
Might be a bit old, but if not.
If I'm picturing this properly I'd say yes it should. If you want to be sure it does/doesn't though (or just want to be very deliberate about what area that pressure acts on) you could always put in a fixed orifice or a hydraulic pipe component in order to restate the dimensions.

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Answers (1)

Yifeng Tang
Yifeng Tang on 29 Jun 2022
The hydrostatic pressure does acts on such an area AND it only acts on the fluids. No pipe wall or any solid part is experiencing any force -- I am guessing this is where the question comes from since p*A is force and that seems to only be relavant when you have some solid part to act on. The main effect of a different passage area is the amount of pressure drop over this component for a certain flow rate, or dP vs Q relationship.

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