9 replies to this topic

[firewall200]

Hello everybody
iam going through my final year of studying to earn master degree of mechanical engineering
My research topic is the pilot operated relief valve performance, the big problem that I need technical information about how to design the valve, you know engineering stuff (technical documentation, equations of design the whole valve) but all I can found is a commercial pamphlets and sizing for orifice of the valve
iam kind of lost now so if anyone could help it would be the best thing I have ever had since a long time
I need in brief
Technical documentation for this valve design with all details drawings, documents, books anything even names of books that may help but in the whole design thing
I hope the miracle could come true and found anyone to help

[Dazzler]

Hello Firewall200
Perhaps sourcing and reading a couple of main API standards particularly API Std 521, and some of the main vendors manuals Fisher, Masonelian, Samson, Tyco, Crosby etc, may help.
Dazzler

[firewall200]

thanks Dazzler for your response
i have already tried with crosby and tyco valves they have great experience in this valves manufacturing but they don’t offer a full technical document for each valve component which iam looking forward to see and read i need a technical documents to guide me through the design process like where to start what are the major component in the valve design ( iam kind of lost )
All papers as I said before talks about sizing the orifice they don’t talk about stem and seat design for example which helps me to understand how the valve operates but makes me unable to design a new prototype until now
Of course I will try with Samson and dresser hoping to find what iam looking for
Until this happened if you found out anything could help I would be most appreciated your effort
Thanks again

[Michael Conway]

Firewall200, I have worked on relief valves for about 13 years. You can contact me at akhammer23@live.com and I can see what I can do to help you out. Please included Pilot valve in the subject so I know it's you.

[firewall200]

thank you all for your interaction with my problem but unfortunatly untill now i did not received any technical information from any one
so if any one could help me plz contact me as am i in need to this information
am i already late on my project time scale progress
thank you all again

[firewall200]

thank you all for your interaction with my problem but unfortunatly untill now i did not received any technical information from any one
so if any one could help me plz contact me as am i in need to this information
am i already late on my project time scale progress
thank you all again

to mr Michael Conway
based on your acceptance i have already sent you 2 mails but you didnot respond to my e mails so plz take my e mail from this topic ( bebo_bebe@hotmail.cm)
plz check your inbox and reply
i hope you would help

[firewall200]

Come on people
I can't believe it!!!!!!!!!!
Iam in the safety relief devices section and nobody can answer my questions??
If I did not found the answers here where else should I go???
My question had been here for more than 6 weeks and all I have just general answers and promises to help and I actually got nothing
"Sharing is caring people"
If you have any information keeping it in your computer or your mind will not make you better and will not help humanity or other people
We are in the forum to help each other and to exchange our experiences
Iam really disappointed and I cannot find any word to express how depressed am I due to the strange behavior from some members promise to help and they do not even answer my e mails
Thanks to everyone and sorry if I crossed my line

[chemsac2]

Firewall200,

There are many articles on www.sciencedirect.com website (Elsevier publications), particularly journals like "Journal of loss prevention in process industries", "Simulation modelling practice and theory". A simple search of "pressure relief valve" yielded 18200 results on sciencedirect.

I found this reference on pilot PSVs which may be of interest to you.

Dynamic analysis of pilot operated pressure relief valve
Simulation Modelling Practice and Theory, Volume 10, Issues 1-2, 15 October 2002, Pages 35-49
K. Dasgupta, R. Karmakar

Unfortunately I do not have access to this website nor have copy of this article. Many univerisities have access to these journals.

Hope it helps.

Regards,

Sachin

[firewall200]

i would like to thank you for your response
i have a copy of this article you are talking about but unfortunately it just talks about the valve simulation and did not talk about the design of the valve
any way thanks again and if you would like to have a copy of this article i will send it to you any time
what i_am looking for is some technical details about design of the internals of the valve itself to be able to manufacture a small model of this valve so the deep theoritical articles does not help so much so i thought that people with experience in this area would have a simple information about this topic in the point of view of the manufacturing philosophy

your response was great , it make me feel that there are some people care ,thanks a lot for that




Regards,

firewall200

[chemsac2]

Firewall200,

Note sure if this is what you are looking for, but this is how I would do it if wanted to do it from basics.

1. Pilot of PSV is just like another balanced bellow or conventional PSV.
2. These can be modeled using simple force balance on disc consisting of inertia of disc, spring force, pressure force etc. A method is outlined in "Model to predict transient consequences of heat exchanger tube rupture", Sumaria, V.H., 631-654, Proceedings - Refining Department, API, Washington DC. This article can be obtained from Linda Hall Library.
3. Main valve can be modeled using force balance on disc consisting of downward disc force due to larger top area of disc, upward pressure force and inertia force of the disc

I am not sure how to integrate pilot and main valve equations, but detailed analysis can suggest some way.

Regards,

Sachin