Kiwi Airgunners Homepage
Forum Home Forum Home > Technical > Pauly's Technical Area
  New Posts New Posts RSS Feed - Valve mod - pcp pistol
  FAQ FAQ  Forum Search   Register Register  Login Login

Valve mod - pcp pistol
 Post Reply Post Reply Page  <1 567
Author
Message Reverse Sort Order
  Topic Search Topic Search  Topic Options Topic Options
Pauly5 View Drop Down
Forum Moderator
Forum Moderator
Avatar

Joined: 11 Mar 2013
Location: Titahi Bay
Status: Offline
Posts: 1601 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pauly5 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2024 at 6:06am
Thanks Xyon, that makes sense, I might go that way. I know I could use HSS drill shanks too, then use the relevant reamer for the hole. But I have no reamers at this stage.

Kruz, I would like to put a reg into it, but they cost about $70 to $80 Euro + delivery each. I should be able to fit one at a later date as the way I have made the body should provide a plenum.
Back to Top
nunga View Drop Down
Admin
Admin
Avatar

Joined: 09 Mar 2013
Location: Pukekohe
Status: Online
Posts: 1057 		Post Options Post Options   Thanks (0) Thanks(0)   Quote nunga Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2024 at 5:57am
The screwdriver shaft is not hardened only the tips are hardened steel. and you would find it very difficult to machine the hardened steel anyway. you will need grind it.

If it was me doing it i would be looking into 316 stainless for the valve and bronze alloy or brass for the seat. I have both here if you want to play with that. I have 10 and 20mm round 316 bar here. can easily make what ever bronze alloy you want.

Just a thought.
2nd place HP springer - WFTF World Championships 2014
Back to Top
xyon View Drop Down
Senior Member
Senior Member
Avatar

Joined: 21 Dec 2016
Location: Canterbury
Status: Offline
Posts: 135 		Post Options Post Options   Thanks (0) Thanks(0)   Quote xyon Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2024 at 5:41am
If you need to machine the valve then a steel than can be annealed and hardened is good.
I've a used Class 10.9 or was it 12.9 bolt as they are strong but still machinable with HSS tooling.
---
My favourites
springer - Diana 52
PCP - FX Wildcat III
Back to Top
Pauly5 View Drop Down
Forum Moderator
Forum Moderator
Avatar

Joined: 11 Mar 2013
Location: Titahi Bay
Status: Offline
Posts: 1601 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pauly5 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2024 at 5:02am
The pin is around 3 - 4mm dia, so while a chisel material is perfect, it's too big.
Back to Top
J-S View Drop Down
Senior Member
Senior Member


Joined: 20 Oct 2014
Location: Auckland
Status: Offline
Posts: 468 		Post Options Post Options   Thanks (0) Thanks(0)   Quote J-S Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2024 at 4:54am
ooh looks interesting
J S Airguns
Air Arms TX200('s)
Theoben Sirocco
HW77
FWB 300s
Webley Patriot
One or two others...

Current projects:
Too many..
Back to Top
kruzaroad View Drop Down
Senior Member
Senior Member
Avatar

Joined: 03 Jul 2022
Location: Hastings 4 now
Status: Offline
Posts: 2512 		Post Options Post Options   Thanks (0) Thanks(0)   Quote kruzaroad Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2024 at 4:30am
Question, would chisel shaft be better?, as they are designed to take to be hit.
You puting a regulator on it?
Back to Top
Pauly5 View Drop Down
Forum Moderator
Forum Moderator
Avatar

Joined: 11 Mar 2013
Location: Titahi Bay
Status: Offline
Posts: 1601 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pauly5 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2024 at 4:03am
Valve body out of aluminium, the seat made out of stainless and I will use stainless for the opposing valve pin seat too.

My plan is to make the pin out of a screw driver shaft and then use valve grinding paste to bed them in with each other.

That's the plan.

I could make the whole pin and seat out of stainless, but I wasn't sure how well it will handle being struck by the hammer, where the screwdriver shaft is hardened.
Back to Top
nunga View Drop Down
Admin
Admin
Avatar

Joined: 09 Mar 2013
Location: Pukekohe
Status: Online
Posts: 1057 		Post Options Post Options   Thanks (0) Thanks(0)   Quote nunga Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2024 at 3:48am
what are you making the value out of?
2nd place HP springer - WFTF World Championships 2014
Back to Top
Pauly5 View Drop Down
Forum Moderator
Forum Moderator
Avatar

Joined: 11 Mar 2013
Location: Titahi Bay
Status: Offline
Posts: 1601 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pauly5 Quote  Post ReplyReply Direct Link To This Post Posted: 04 Sep 2024 at 4:41pm
After a long break from doing anything creative I have started on a new pistol build. This time I am making the valve differently. After some advice from fellow gunners and also copying a proven design I started.

Instead of trying to form a good seal on a surface within the valve body I am making the valve seat out of stainless and it will sit in the body, but can be removed/replaced if needed. You will see in the photo an FX Bobcat valve stem and seat, and next to it my valve seat with O ring groove cut into it and the valve body behind.

Next stage is the valve stem with sealing surface.
Back to Top
 Post Reply Post Reply Page  <1 567
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 10.14
Copyright ©2001-2012 Web Wiz Ltd.

This page was generated in 0.016 seconds.