What not use a proportional relief valve?

In summary, there is a debate in the nuclear industry about the use of venting valves. Some experts argue that a rupture disk may be better in certain cases, while others support the use of manually controlled systems. However, there is also the option of using proportional relief valves, which are designed to open and close with changes in pressure. These valves have been used in the past but are not commonly seen in nuclear power plants. The recent Fukushima disaster has brought attention to the importance of proper venting measures and the need for further investigation into what went wrong.
  • #1
tsutsuji
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There is this talk in the New York Times about venting valves :

But the consensus in the nuclear industry supports the existing systems. Douglas E. True, the president of ERIN Engineering and Research of Walnut Creek, Calif., said: “In some cases you can argue it might be better to have a rupture disk. In other cases, it would certainly be better to have a manually controlled system.” For example, he said, the disk is backed up by a valve that is normally in the open position. If the disk ruptured and there was no electricity, it might be impossible to close the valve, and the venting would be permanent.
http://www.nytimes.com/2011/05/19/science/earth/19nuke.html?partner=rss&emc=rss

What not use a proportional relief valve ?
 
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  • #2
I Found the following comment :
John Neely Ft. Collins said:
I don't know what happened to pressure release valves. They are opened by excessive pressure and close themselves when the pressure drops. You will find them on your water heater and even simpler versions on a pressure cooker. They were used on the test loops at the Idaho test reactors in the late 60's and presumably still are.
(...)
I'm curious why they aren't used.
http://green.blogs.nytimes.com/2011...eatens-to-blow-its-stack/?partner=rss&emc=rss

So am I.
 
  • #3
Very interesting article Tsutsuji, thanks!

All this venting subject is totally unclear in this Fukushima disaster, obviously it's not the primary cause of the disaster but it revealed that a lot of things didn't work as expected ALSO in this department... which ended up making things worse i think.

We will need time and torough expertise to clarify what really happened...
 

Related to What not use a proportional relief valve?

1. Why should I not use a proportional relief valve?

Proportional relief valves are designed to provide a variable flow rate, which can be useful in certain applications. However, they are not recommended for use in systems with fluctuating flow rates or high pressure differentials. This is because the valve may not be able to accurately control the flow and could lead to potential safety hazards.

2. What are the limitations of a proportional relief valve?

Proportional relief valves have a limited range of flow control, typically up to 30% of the maximum flow rate. They also have a limited turndown ratio, which means they may not be able to accurately control low flow rates. Additionally, they are sensitive to changes in pressure and may not function properly in systems with high pressure differentials.

3. Can I use a proportional relief valve for all applications?

No, it is important to carefully consider the application before using a proportional relief valve. They are not suitable for systems with fluctuating flow rates or high pressure differentials. They also may not be appropriate for systems with low flow rates or where precise flow control is required.

4. What are the advantages of using a traditional relief valve over a proportional relief valve?

Traditional relief valves are simple and reliable, with a fixed set pressure and full flow capacity. They are also less sensitive to changes in pressure and are suitable for a wide range of applications. Additionally, they are typically less expensive than proportional relief valves.

5. How do I know if a proportional relief valve is the right choice for my system?

The best way to determine if a proportional relief valve is suitable for your system is to consult with a qualified engineer or valve specialist. They can evaluate the specific requirements of your system and recommend the most appropriate type of relief valve for your application.

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