Ball checks are similar to globe valves in layout in the sense that the flow tends to be up and over (or around) rather than a "straight-through" pattern that wafer checks have. This would seem to result in more turbulence and higher pressure drop.
My experience in refineries that were built 60+ years ago indicates that at that time there were limited alternatives as to check valve choices and wafers don't exist in the original specs. Same goes for high-performance butterfly valves.
If you are unsure, consult an expert for the intended fluid and pressure application.
If you are diverting from original plant specs and rely on supplier recommendations, I STRONGLY suggest that you check out the supplier.
In the past, stuff has blown up because products looked good (for the price) but actually were non-code. We don't want to kill anybody here.
Paul
> It is availble with the vendor that he can supply rightaway.enough space
is
> avialable. wafer is replaced with ball type. pressure loss is very less.
>
> regards
> lakshmi narayana
>
> -----Original Message-----
> From: rajendra bajikar [mailto:rajendrabajikar@yahoo.com]
> Sent: Wednesday, October 29, 2003 8:40 AM
> To: PipingDesign@yahoogroups.com
> Subject: Re: [PipingDesign] check valve
>
>
> The Non Return Valve, whatever type you use, is to prevent back flow. You
> may want to check out the pressure losses between the two, if it is
critical
> in any way. You have not mentioned the reason for this change.
> Regards,
>
> "Lakshmi V. Narayana" <LNarayana@safco.net> wrote:
>
> Dear friends,
>
> Instead of wafer type check valve(PTFE lined),PTFE ball type check valve
is
> being used for oily water service (3"NB) pressure 4KG/cm2 temp 44C . is
> there any negative impact in doing so. can anybody throw some light on
this
> .
>
> Regards
> LAKSHMINARAYAN
> MECHANICAL ENGINEER
> SAFCO
Received on Thu Oct 30 00:13:00 2003
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