Re: Internals

On the Anti-friction type components, such as wear strips, bushing guide and possibly seal case, you could go to a high temperature polymer, such as PEEK (poly ether etherketone) -think I got the name right, definitely known in industry as PEEK. We have run valve components of this material, it's good for high temperatures but NOT for low - gets brittle at low temps.

George McKinney
----- Original Message -----
From: "Lakshmi V. Narayana" <LNarayana@safco.net> To: <PipingDesign@yahoogroups.com>
Sent: Monday, November 10, 2003 12:34 AM Subject: [PipingDesign] Internals

>
> Pneumatic driven check valve(control valve) for process air to
> reformer, soft internals of actuator are getting damaged (become brittle)
> and being replaced in every shutdown.
>
> The internals like bushing guide,(made of Teflon),Rod wiper ,seal
> ring case for case(Rubber),wear strip(teflon),U-cup,seal ring piston
> (Rubber) are getting damaged due to high temperature .
>
> The temperature of process air is 520 C. this may be due to heat
> conduction through spindle to actuator.
>
> TEFLON can take 250 C max. TEFLON can be replaced with TEFZEL. If
any
> body has faced such kind of experience please send suggestions.
>
> LAKSHMI NARAYANA V
> MECHANICAL ENGINEER
> SAUDI ARABIAN FERTILIZER CO.
>
>
>
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Received on Mon Nov 10 07:45:00 2003