Steyr valve vs anscutz valve

Discussion in 'Steyr' started by hmangphilly, Apr 12, 2019.

  1. hmangphilly

    hmangphilly Can't Re Member

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    Almost the same but not quite

    Steyr is the fatter body and fatter spring Pip
    IMG_4107.JPG IMG_4108.JPG
     
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  2. C.Eaton

    C.Eaton Confirmed Anschutz Nut...

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    Have you tried weighing the two hammers, my guess is that the Anschutz is lighter so only needs a smaller spring?
     
  3. RobF

    RobF Administrator Staff Member

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    What about the orings?
     
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  4. hmangphilly

    hmangphilly Can't Re Member

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    Dunno
    The ports are 4.1 steyr and 4.0 anschutz
     
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  5. cloverleaf

    cloverleaf Active Member

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    The valve mass shouldn't really have much of a relationship with the necessary spring spec IMO ;)

    Indeed - the most important value here IMO is the ID of the O-ring once compressed and hence the pressure loading across the valve when closed / force required to open it, curtain area, lift required to achieve full flow and all that good stuff :)


    Very interesting that they're so similar in format and yet different. Are their stems the same diameter?
     
    Last edited: Apr 13, 2019
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  6. cloverleaf

    cloverleaf Active Member

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    Quite telling of the guns' origins and development IMO; as large as they can / need to be for sub 12ftlb (and more likely sub 6ftlb) use but a bit smaller than would be ideal for high output.

    This is one of the facets I love about the LG110; the port sizing is large enough to give the best performance with different pellet weights at the required muzzle energy output while not being so excessively large as to require more energy to open the valve than necessary.

    Shows some proper thought was put into the process by some knowledgeable people, rather than just plucking arbitrary figures out of the air like "some other" manufacturers seem to do..
     
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  7. hmangphilly

    hmangphilly Can't Re Member

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    Oh look
    I spelt anshuts wrang in the titttle.

    Bum
     
  8. dave croucher

    dave croucher FT, the sport where simple becomes complicated

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    I noticed this but didnt mention it as you seem quite clever and i didnt want to discourage you
     
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  9. RobF

    RobF Administrator Staff Member

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    oh what have you done...
     
  10. hmangphilly

    hmangphilly Can't Re Member

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    IMG_4109.JPG IMG_4110.JPG IMG_4112.JPG IMG_4113.JPG IMG_4114.JPG

    Stems the same dia 1.48 mm

    Heads give or take 8 mm steyr , 7.5 anschutz

    O rings different size
    Both. Seem 1 mm ish section
    Hard to measure sizes because they've been squished and swaged
    But kinda sorta
    4.5 I d / 6.3 od steyr
    4mm id / 5.4 od anschutz

    the steyr o ring sits less pronounced than the anschutz..possibly less temp affected because of that .

    the anschutz o ring inner edge is really close to the port

    i have taken a steyr valve down to around the same dia as the anschutz
     
    Last edited: Apr 12, 2019
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  11. nemesis

    nemesis 55yrd standing expert, or was it 8 or 9?

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    I wud o thought yad'a scrubed yer fingernails after yer date with Dave, Wots that brown stuff. :eek:
     
  12. C.Eaton

    C.Eaton Confirmed Anschutz Nut...

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    Interesting that the Steyr hammer is heavier and longer. I’m still amazed how long that sucker is in comparison with the Anschutz one.
     
  13. hmangphilly

    hmangphilly Can't Re Member

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    It has to be that long cos the spring is a long way from The valve
     
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  14. cloverleaf

    cloverleaf Active Member

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    Interesting! From the valve O-ring sizes it looks like the Anschutz valve is a closer match to the valve throat; which is a good thing as it will reduce valve opening load (by nearly 25% if we're talking 4.0mm ID versus 4.5mm on the Steyr) while not choking flow at the throat.

    When measuring mine IIRC I found the Steyr's valve throat to be around 4.25mm diameter; giving an area of around 14.2mm^2, or 12.4mm^2 flow area once the 1.8mm^2 area of the valve stem has been taken into account. This is pretty well matched to the 12.6mm^2 flow area of the 4mm porting throughout the rest of the system.

    I imagine Steyr back-worked the port size from the bore - make the port 0.5mm smaller on the OD than the smallest bore to prevent the pellet falling into it, make the valve stem as small as possible without compromising strength, make the throat whatever diameter is necessary to give the same flow area as the porting then spec the next standard size up for the O-ring in the valve.

    Going as large as possible on the port ensures the lowest operating pressure (so more shots per charge) and minimal sensitivity to pellet mass.

    Am I correct in thinking that the LG100 series started out as a dedicated 10m gun (so .177, 6ftlb only) before they released the higher output "adventure" / Hunting / FT guns? Would figure as the porting is ideal for .177 but a bit lacking for .22 - especially at the 40J they knock them out at.
     

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