Proportional Pressure reducing/relieving valve.

Discussion in 'The Projects Forum' started by manuatl, Sep 25, 2015.

  1. manuatl

    Thread Starter New Member

    Sep 25, 2015
    I want to use a proportional valve for controlling the pressure in a tank/cylinder. In our design we need to have two profiles for PC valve. The profiles have to be time based. One profile is to build the pressure from 0 bar to 50 bar in 2 Secs and another to drop the pressure from 50 bar to 0 bar in 2 Secs (see figure below). Profile is shown in attachment. The PC valve I am using is Reducing/Relieving valve. Does my design require a PID? Any help is appreciated....

    The accuracy isn't that much stringent. I am a newbie in the field of hydraulics.
    The valve I have chosen is, pressure reducing/relieving. My doubt is, whether I can achieve the requirement as per in graph using an Open loop method. Or should I go for a closed loop method (using PID/similar) since over the period the spring constant of valve may get changed and thus the pressure values as per current rating.
  2. BR-549

    Well-Known Member

    Sep 22, 2013
    If you want those pressure steps for those milliseconds, I believe you will need a processor.
  3. MaxHeadRoom


    Jul 18, 2013
    Normally a Hyd proportional valve requires some kind of PID control.