pilot operated check valve to open only by pilot pressure x

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The pilot operated checkvalve provided in simscape fluids is operated by pressure at A or pilot pressure X or both, I wish to open the checkvalve only by pilot pressure . can anyone say is there anything I can do?
  3 Comments
murali manohar boopathy
murali manohar boopathy on 23 May 2021
actually my need is to close a checkvalve with a pilot pressure i.e even when there is craking pressure at A ,the pilot pressure should close the checkvalve but I found the checkvalve in simscape fluids opens with pilot pressure x so i chose to open the checkvalve when needed as i need to open and close 2 checkvalves but the checkvalve is in a way that it opens with both pressure at A and X like it's in double pilot checkvalve. I have attached a picture for your better understanding of my problem.
Hamed Shamsi khani
Hamed Shamsi khani on 23 Apr 2022
Hello.
I'm working at excavator engineering department.
It's very intersting that you want to open a check valve with a signal!
Do you want to analysis your hydraulic circuit( attached photo)?

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Accepted Answer

Yifeng Tang
Yifeng Tang on 24 May 2021
Thanks for the details.
The pilot in this case is acting in the opposite direction as in the "Pilot-Operated Check Valve (IL)" block. It's equivalent to having a negative pilot ratio, but it won't allow you to set a negative value in the block.
Anyway, I think your best bet is to use a "Cartridge Valve Actuator (IL)" and a "Orifice (IL)" block.
The actuator allow you to open the check valve, with a physical signal, when the pressure combination is correct, and the Orifice will translate that signal to an opening that allows/blocks flow.
  3 Comments
Yifeng Tang
Yifeng Tang on 30 May 2021
Yes, the actuator should generate no flow in the Hydraulic or Isothermal Liquid ports and produces a physical signal that you can use to drive the Orifice. You may need a PS lookup table to estabilish the spool position PS from the actuator to the Orifice opening size (depending on which orifice block you end up using). But be careful with how you connect the ports and read the documentation here for when an opening condition is met with this actuator block: https://www.mathworks.com/help/physmod/hydro/ref/cartridgevalveactuatoril.html
I THINK you'll need the 4-port configuration, with the B port unused. PLEASE go over the math yourself.
"Starting in R2020a, MathWorks recommends that you use the Isothermal Liquid blocks for modeling hydraulic systems where the working fluid temperature remains constant during simulation."

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