Reply With QuoteIt could be a solid ptfe seal. I think TR Robb is the only bloke to sell them these days. I should replace it with a new seal if I were you.
atb
Max
Member
I have just stripped down my project HW80.
The piston doesn't have a parachute seal like I am used to seeing, it has some sort of solid nylon block thing.
So - my question
Anybody know what this is? How do you change them? Should I change it? Is a parachute seal better? Is there a conversion out there to change from one to the other?
I have searched the internet with no success so far so I hope the vast wealth of knowledge on here can come to my rescue!
Registered User
It could be a solid ptfe seal. I think TR Robb is the only bloke to sell them these days. I should replace it with a new seal if I were you.
atb
Max
Plinkerer and Tinkerer
Registered User
Are you sure it is not a parachute seal ? The standard seal is white polyurethane with a very narrow undercut near the edge which expands against the chamber walls on compression. See if you can easily cut it with a knife, if so it could be a PTFE replacement someone has fitted. I would think PTFE is the wrong material to use on a piston head as it is malleable and changes shape. That is why it is used as flange seals because it adapts to indentations. You need a resilient material like polyurethane which is used by the majority of spring gun manufacturers.
Baz
Last edited by Benelli B76; 14-10-2015 at 11:53 AM.
BE AN INDEPENDENT THINKER, DON'T FOLLOW THE CROWD
Member
I have managed to get it off. It was so loose int he groove that it gave the impression of being solid and attached by some sort of central mechanism. It is very hard - harder than the seals on my other guns - I suspect it is just old....
Registered User
i can thoroughly recommend the red seals sold by customairseals in australia,they are on the bay of e.cheap as chips,fast postage and an excellent seal.
Member
Originally Posted by larrylamppost
Cheers mate - might give them a go
Registered User
Yes TDI polyurethane with red dye colouring. You can add any colour to the neutral base polymer. Red, green and blue being the most popular for piston seals.
Baz
BE AN INDEPENDENT THINKER, DON'T FOLLOW THE CROWD
Registered User
I have a blue colour seal which was part of the Vortek kit for HW 95/98 ( this kit did not fit my HW 98 BTW ). It was not as efficient as the standard Weirauch seal on my HW 98 by quite a margin. The appearance was also different with a very shallow undercut on the face of the seal. The standard seal has a deep groove around the edge of the seal allowing the compressed air to expand the thin lip of the seal on compression. This probably accounts for the extra efficiency of the original seal which incidentally is not white or cream in colour but old ivory. Whether this indicates a different material is anyone's guess.
Regards,
A.G
Administrator
Does anyone know if the Walther Century seal fits onto an HW80 or HW35 piston ?
All the best Mick
Has a taste for the French fancys
hello neil.I have just stripped down my project HW80.
The piston doesn't have a parachute seal like I am used to seeing, it has some sort of solid nylon block thing.
So - my question
Anybody know what this is? How do you change them? Should I change it? Is a parachute seal better? Is there a conversion out there to change from one to the other?
I have searched the internet with no success so far so I hope the vast wealth of knowledge on here can come to my rescue!
i find the older parachute seals work much better on the hw"s, the newer ones, i have
found to be a bit slack.
Registered User
A second for that, excellent quality item, especially the latest MoS impregnated version, Laurie the owner is a really helpful guy too.
Registered User
http://youtu.be/kNCk0po7QOQ
Take a look at this on YouTube apparently it made a hell of difference to the Walther century power.
Administrator
Thanks for that Mole5.
Bit of a shame the chap didn't use a chrono but his graph worked well enough.
All the best Mick
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