I want to set the PRV downstream control so that it maintains for example 10 mH at my target point all the time. Means the PRV downstream pressure will fluctuate to maintain 10mH at the target point. It is not a fixed outlet PRV.
How can I set such PRV controls?
Hello Mohamad,
What you have described is in fact the way a PRV works. It will reduce pressure downstream to the pressure set as long as the upstream hydraulic grade is higher than downstream. See the article below which provides details on how a PRV functions;
How does the Pressure Reducing Valve (PRV) work in WaterGEMS and WaterCAD?
Let me know if this helps.
Regards,
Yashodhan Joshi
Thank you for your info. Let me elaborate a little further. As per figure below, the orange line is upstream PRV pressure and the grey line is the downstream PRV pressure currently set to about 11mH from 10pm to 5am. And set to 16mH the rest of the day. This is a fixed outlet PRV setting based on time. This PRV control results in the target point (blue line) to have pressure of at least 10 mH (fluctuating between 10mH - 15mH)
What I would like to have is a PRV control whereby the downstream pressure control is such that it always maintains 10mH at my target point. i.e. the PRV downstream pressure fluctuates to maintain 10mH at the blue line all the time.
How can I control the PRV such way?
If I am getting this correctly you want to control pressure at some remote location using PRV, whereas conventional PRV controls pressure at valve location and you are looking to control pressure at other point in the system.
Which is not possible to model currently in WaterGEMS / WaterCAD, we have filed an enhancement for this to consider modeling this in future versions, reference number is # 278426, please read detailed information about this below.
Modeling PRV / PSV controlled by pressure at remote location in the model
Sushma Choure
Bentley Technical Suppport