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My issue is that downstream, I have a boiler making pressure at 10.54 bar and upstream I have a system that must NOT be heated at any point beyond 130 °C. My plan is to make sure the system pressure upstream stays 3 bar at max and doesn't fall significantly below that as long as the pressure downstream is greater than 3 bar but I can't use any relief valves or anything as they bleed away too much steam. Is there a check valve or any other valve systems that will make sure that the pressure stays less than 3 bar at all times and preferable, more than 2 bar as well? Please don't recommend any electronic systems.

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    $\begingroup$ Use a pressure regulator. $\endgroup$
    – DKNguyen
    Sep 2, 2022 at 20:25
  • $\begingroup$ That would require too much human input in case the boiler pressure fluctuates. I need a system that opens the valve when pressure drops below 2 kg and closes the valve as soon as it goes above 3kg and just heats the system from 2-3 kgs of steam. $\endgroup$ Sep 3, 2022 at 2:39
  • $\begingroup$ Human input? What do you think a pressure regulator does exactly? Also, you seem to be using the terms "downstream" and "upstream" backwards. Rivers begin upstream and flow in the downstream direction. $\endgroup$
    – DKNguyen
    Sep 3, 2022 at 3:02
  • $\begingroup$ Okay so they operate constantly they just need excess pressure on inlet side. Kinda what I was looking for so this will work. Thanks $\endgroup$ Sep 3, 2022 at 3:27
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    $\begingroup$ Yeah.................. $\endgroup$
    – DKNguyen
    Sep 3, 2022 at 3:39

1 Answer 1

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It's called a pressure regulator or pressure reducing valve.

They work by mechanically actuating a valve based on the outlet pressure (the one you want to keep at 3 bar), choking off the flow when it rises.

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