Dynamic Pressure Valve for Heated Gas Release

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Discussion Overview

The discussion revolves around the design and functionality of a valve that can release heated gas at a specific pressure and then close once the pressure drops. The context includes applications in systems where gas is heated to high temperatures, such as in boilers.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about a valve that opens at a high pressure and closes once the pressure decreases back to a lower threshold.
  • Another suggests that a regulator could serve this purpose, although the specifics of the requirement are not fully addressed.
  • A participant proposes a pressure relief valve as a possible solution.
  • One response mentions a solenoid operated valve, indicating that there are various manufacturers available.
  • A later reply questions whether the pressure needs to return to the original level or just below a certain threshold, suggesting that a simpler valve might suffice.
  • Another participant shares their experience with mechanically operated safety valves in boilers, describing how they function with a spring mechanism to manage pressure.
  • There is a discussion about the size and application of these valves in large boilers, with a focus on safety and venting practices.

Areas of Agreement / Disagreement

Participants express differing views on the type of valve needed, with some suggesting regulators or solenoid valves, while others advocate for pressure relief valves. The discussion remains unresolved regarding the specific requirements and preferences for the valve design.

Contextual Notes

Some assumptions about the pressure levels and the purpose of the valve are not fully clarified, leading to varying interpretations of the requirements. The discussion also highlights the potential for different operational mechanisms (mechanical vs. solenoid) without reaching a consensus on the best approach.

Drakkith
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Is there a valve that can be set to open to let hot gas out at a certain pressure, and then close once the pressure drops back down?

Edit: Sorry, I'm looking for a valve that will let the pressure build up to a high point, then open to release the gas until the pressure is released, then close again until the system builds up another cycle of high pressure. For example, I pump a cool gas into a closed space and heat it up to 500 degrees, at which point this valve opens up and releases the pressurized gas until the pressure is reduced to the original pressure of the cool input gas, then closes until the next cycle of air reaches 500 degrees.
 
Last edited:
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A regulator. They come in all shapes and sizes.
 
boneh3ad said:
A regulator. They come in all shapes and sizes.

Whoops, i don't think i described what i needed very well. Lemme edit it.
 
So a pressure relief valve (that is what it is called)?
 
A solenoid operated valve is what I think you are looking for. There are many manufactures for this. http://www.ascovalve.com/"
 
Last edited by a moderator:
Well, I suppose the question is whether or not you need the pressure to go all the way back down to the original pressure after it vents or just down to the threshold pressure for the valve. There is no need for a complicated and expensive solenoid valve if you just want your system to vent once it gets above a certain pressure and then when it drops back below that pressure to close back up.

What is the purpose of this valve? That would probably net you some better responses.
 
wmazz said:
A solenoid operated valve is what I think you are looking for. There are many manufactures for this. http://www.ascovalve.com/"

Thanks!
 
Last edited by a moderator:
I work at sea, and on our boilers we have these types of valves. We use them as safety valves to ensure the pressure inside the boiler doesn't get too high.

Ours are mechanically operated using a spring though. Spring is set to compress at a certain pressure, it is normally closed, pressure builds up, gets too high and the valve opens. Then when the pressure is back to where the spring will close, the valve closes.

Might be useful?
 
DannyT said:
I work at sea, and on our boilers we have these types of valves. We use them as safety valves to ensure the pressure inside the boiler doesn't get too high.

Ours are mechanically operated using a spring though. Spring is set to compress at a certain pressure, it is normally closed, pressure builds up, gets too high and the valve opens. Then when the pressure is back to where the spring will close, the valve closes.

Might be useful?

I think his edited post made it quite clear that he wants the valve to close again considerably below the threshold level (for whatever reason). Interesting that the boilers have this system, it must be quite large! Where does it vent to? Not the boiler room?
 
  • #10
Ahhh, My apologies.

Yeah we are talking big boilers, we need a fair bit of steam for all the heating systems for fuel oils etc. They vent to atmosphere usually via the funnel.
 

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