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  • RTFE amp; RPTFE - Polymer engineering | Eng-Tips
    Depends PTFE usually means poly-tetra fluoro ethylene, aka Teflon, and there aren't many other acronyms with those letters
  • PCTFE and RPTFE - Valve engineering | Eng-Tips
    RTFE is reinforced (typically glass) seating It is better and will be suitable to valves with higher pressures but may still be limiting in Class 900 and 1500 valves which might not be able to have full flange rating Again, immune to most environments PEEK is good to all ASME pressure classes and is highly resistant to most environments
  • API 6D Slab Gate Seats: RTFE vs Devlon vs Metal to Metal
    A customer of mine wants some large bore API 6D slab gates, media is corrosive brackish water The customer absolutely insists on RTFE seat inserts Usually a 900# valve would come with Devlon seats, with PEEK being a more expensive alternative for the highest temperatures For whatever reason they wont accept Devlon or any nylon type product
  • Operating Range of RTFE seats in a Butterfly valves 1 - Eng-Tips
    Theoretically RTFE should be OK for the range, but I would as you sought for improved solutions Suggestions are FFKM (for instance Kalrez from du Pont) or probably better, as used for steam-valves, sealings reinforced with graphite (carbon) for soft sealing, or pure metal or sintered metal sealings
  • RTFE coating for valve seats --where particulates in fluid exist - Eng-Tips
    For ball valve seat material selection can someone advise if there is a selection criteria to allow one to assess the acceptability of coatings for erosion resistance such as RTFE for given concentration of particulates in a fluid that the valve or material may be exposed to Specifically to be able to define what is "sandy service" and what isn't
  • RPTFE SEAT BALL VALVE TEMP RANGE - Valve engineering - Eng-Tips
    Forget it RTFE, irrespective of type, is no longer reliable beyond 232 C (450 F) Some people claim some resistance to 260 C (500 F) but there is very little data to support valve seats made of RTFE at that temperature Generally, if you need sustained service between 232 and 315 C you must use PEEK
  • Ball Valve Seats and Seals Help - Valve engineering | Eng-Tips
    It seems the main Seat materials are PTFE RTFE, Devon, Nylon, PEEK, Viton-A, and Metal-Metal The Seal materials are Buna-N, HNBR, PTFE, and Viton-A So my problem is that I was told not to use Buna HNBR etc because the benzene in our product eats through that too easily, and I need low temp capabilities (-40) so that puts out Viton-A
  • 2nd Generation PTFE vs. Reinforced TFE - Valve engineering
    The reference is to Dyneon, the former Hoechst, grade TFM It is modified with the monomer used to produce PFA which results in a material possessing extremely high resistance to creep (cold flow) with out the addition of additives, such as fiberglass used in reinforced PTFE parts
  • Seat Material Devlon with RPTFE | Eng-Tips
    Hi all, Recently i came across a thing, where we selected RPTFE as the seat material for trunnion mounted ball valve with an operating conditions of max temp 53 deg C and pressure upto 16 9 barg However, the VENDOR has provided suggested DEVLON seat material against the one we have
  • PTFE Teflon body seals on ball valves - Valve engineering
    The trouble is your 200 C temperature range Full flange class pressure rating at 200 C may be beyond the limits of PTFE or RTFE body seals- it certainly will be beyond the limits of PTFE RTFE ball valve seats Grafoil is typically specified as an alternative





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