How to calculate thickness of the segmental ring?

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Discussion Overview

The discussion centers around calculating the thickness of a segmental ring used in pressure seal bonnet valve design. Participants are exploring the design considerations and requirements for this component, including its role in withstanding forces due to working pressure.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant, a design engineer, seeks guidance on how to calculate the thickness of a segmental ring used in valve design.
  • Another participant points out that more information is needed to provide a better response, suggesting that the initial query lacks sufficient detail.
  • Questions are raised regarding the application specifics, such as whether the setup involves a reciprocating or rotating shaft, the type of fluid involved, and the maximum operating pressure and temperature.
  • Concerns are expressed about the absence of contact between a moving shaft and a seal in the provided diagram, leading to inquiries about the placement of the segmental seal.

Areas of Agreement / Disagreement

Participants have not reached a consensus, as there are multiple questions and requests for clarification regarding the specifics of the application and design requirements.

Contextual Notes

The discussion highlights limitations in the initial query, particularly the need for more detailed information about the application and operational conditions to accurately address the calculation of the segmental ring's thickness.

saran
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Hi,
I am working as a design engineer. I am new to pressure seal bonnet Valve design. In that valve concept we are using a ring called as Segmental ring. The purpose of this ring is to withstand the entire force acting on the bonnet due to is working pressure. Now i want to know how to calculate the thickness of that ring. Here i am attaching the Picture for your ref. Thanks in advance.
 

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Hi saran

As per the first thread in this section of PhysicsForums (PF), this is for introductions only (https://www.physicsforums.com/threads/please-read-no-questions-in-new-member-introductions.776481/). Please post your questions in the other areas of PF.

And also, welcome to PF!

Stevie
 
Baluncore said:
Here is a link to; Mechanical packing design and theory of operation. It includes segmental ring seals.
http://www.c-p-i.com/media/cms_page_media/11/cpi mech pck bklt US-updte6 11-.pdf
We need more information before we can give a better response.

Baluncore said:
Here is a link to; Mechanical packing design and theory of operation. It includes segmental ring seals.
http://www.c-p-i.com/media/cms_page_media/11/cpi mech pck bklt US-updte6 11-.pdf
We need more information before we can give a better response.

Hi Baluncore thanks for your reply. What kind of details you want for this?
 
Is this for a reciprocating or a rotating shaft?
Is it for air, steam or some other fluid?
What is the maximum operating pressure and temperature?

In your section diagram 10e.jpg I see no contact between a moving shaft and a seal that will wear. It appears to only involve a static packing. So where is your segmental seal going to be placed?
 

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