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vishnudev
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Join Date: Jul 2010
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Valve Trim

07/06/2010 7:39 AM

hi friends,

any one can help me to give me the exact definition of valve trim and what are the different parts that comes under this?

thank you.
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PWSlack
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#1

Re: Valve Trim

07/06/2010 9:08 AM

Check-out the article in Wikipedia on globe valves and start from there.

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lyn
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#2

Re: Valve Trim

07/06/2010 9:56 AM

Are you studying for an exam? That's quite a flurry of questions from you.

Some explanation of your motives might yield more help.
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ad016
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#3

Re: Valve Trim

07/07/2010 4:38 AM

Hi,

To quote 'Valvology' booklet: "Trim: The internal components of a valve exposed to the flowing fluid, ie. the Seat, Disc and Spindle."

Sometimes 'Trim' is used to refer to the 'Disc' or 'Valve Member'

Here is a picture of a simple Stop Valve to illustrate:

The Seat is not always machined as part of the Body, it can be a separate item.

I hope this is of some use.

Drew
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vishnudev
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Posts: 8
#4

Re: Valve Trim

07/08/2010 5:18 AM

thank you..

what about the inner lining of the valve body? Is that also called trim? if yes then, Is the inner lining is made of 13% cr for any carbon steel valve body?
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ad016
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#5
In reply to #4

Re: Valve Trim

07/08/2010 1:06 PM

Not sure what you mean by the 'inner lining'. If you mean the material surrounding the Spindle in my sketch, that's called a 'Bonnet' and is not part of the Trim and would not normally be made of stainless steel in a carbon steel valve (unless your standard product was stainless and making a carbon steel version would be an expensive one-off)

Could you enlarge on your comment please.

Drew
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vishnudev
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#6
In reply to #5

Re: Valve Trim

07/08/2010 10:30 PM

no no not bonnet.. i meant to say the body itself. after flowing through the valve body only, the fluid will be able to come in contact with disc, stem and other trim parts. so i was asking whether internal part of body can also be considered as a part of trim. hope u get me now..
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ad016
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#7
In reply to #6

Re: Valve Trim

07/09/2010 2:34 AM

No, the Body is not considered part of the trim.

It is not unusual to have stainless trim parts in a carbon steel valve, but it will be quite tricky to have a stainless inner surface in a carbon steel body (ref your comment #4)

I would endorse P.W.Slack's comment and have a look at Wikipedia.

Drew
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ad016
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#8
In reply to #7

Re: Valve Trim

07/09/2010 7:05 AM

Thinking about this further; it is fairly common to have a stainless steel (440C) or corrosion resisting steel (BS3S145) Seat brazed into a carbon steel Body. This could conceivably be specified as part of the valve trim. Perhaps this is what you had in mind in post #4

Drew
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ad016 (4); lyn (1); PWSlack (1); vishnudev (2)

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