Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 67 users online :: 4 registered, 0 hidden and 63 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

Registered users: Bing [Bot], Google [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

PVC bolt in flat plug for piston valve

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
Sponsored 
  • Author
    Message

PVC bolt in flat plug for piston valve

Unread postAuthor: c11man » Sun Mar 14, 2010 1:16 am

since spring is just around the corner i can start using my favorite spudgun material again, PVC. this cannon would be a 2inch piston but built completly out of sch 80 to allow for up to 300psi use. to keep the pilot side of the valve nice clean and small my idea is to make a flat plug out of some impact resistant pvc (off mcmaster) that fits in the pipe. it would be held in with bolts and sealed with an oring or 2. also 1/2 or 3/4in npt threads would be in the center of it. my question is how thick of pvc would i need to handle the 300psi with a saftey factor of 2~3.
  • 0

User avatar
c11man
Brigadier General
Brigadier General
 
Posts: 783
Joined: Fri Feb 06, 2009 4:37 pm
Location: Wisconsin, USA
Country: United States (us)
Reputation: 0

Unread postAuthor: spudtyrrant » Sun Mar 14, 2010 1:28 am

well i guess its time to refer to the trusty old PVC pressure graph Image it looks like 2" sch 80 should be just about suited to your needs, that is assuming this test was done with air tho, not water.
  • 0

I ♥ ♣'in baby seals
User avatar
spudtyrrant
Colonel
Colonel
 
Posts: 550
Joined: Fri Jan 02, 2009 6:10 pm
Reputation: 0

Unread postAuthor: c11man » Sun Mar 14, 2010 9:50 am

im sorry i guess the question was worded poorly. i am wondering how thick i need to make a plug that fits inside of the 2inch sch 80. the plug is flat so i know it will have to be fairly thick but beyond that i have no clue
  • 0

User avatar
c11man
Brigadier General
Brigadier General
 
Posts: 783
Joined: Fri Feb 06, 2009 4:37 pm
Location: Wisconsin, USA
Country: United States (us)
Reputation: 0

Unread postAuthor: Gippeto » Sun Mar 14, 2010 10:01 am

c11. sheet product would have to be pretty thick to withstand the pressure....and the piston impacts, which would be pretty substantial at 300psi.

I'd use a reducer bushing...something like this;

http://www.aquariumsupplies.co.za/image ... 37-338.jpg

I'd use it something like this;


Edit: I see you know it'll need to be thick...damn wasted time searching for pictures. :roll:
  • 0

Attachments
Piston valve 2.JPG
"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
User avatar
Gippeto
Donating Member
Donating Member
 
Posts: 2393
Joined: Sat Jan 19, 2008 10:14 am
Location: The Great White North...Canada eh!
Reputation: 11

Unread postAuthor: c11man » Sun Mar 14, 2010 3:09 pm

i want to avoid a actual fitting if posssible for several reasons like how the stock is going to atttach, ease of oring machining etc..... i would make the plug out of the same pvc rod that i am going to make the piston out of and it comes is 1ft sections so i will have about 8inch of the rod left over. so i can make it as thick as i want! now how think will i Need it to be?
  • 0

User avatar
c11man
Brigadier General
Brigadier General
 
Posts: 783
Joined: Fri Feb 06, 2009 4:37 pm
Location: Wisconsin, USA
Country: United States (us)
Reputation: 0

Unread postAuthor: Gippeto » Sun Mar 14, 2010 10:47 pm

Time to do some research and learn some new math perhaps. :)

Have fun.
  • 0

"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
User avatar
Gippeto
Donating Member
Donating Member
 
Posts: 2393
Joined: Sat Jan 19, 2008 10:14 am
Location: The Great White North...Canada eh!
Reputation: 11

Unread postAuthor: c11man » Sun Mar 14, 2010 11:32 pm

so i did some quick looking around and a 2inch sch 80 end cap has an overal length of 2 9/32 and a socket depth of 1.5inches, simple math and some major rounding up i get 1.5 inches thick to be on the safe side. how does that sound?
  • 0

User avatar
c11man
Brigadier General
Brigadier General
 
Posts: 783
Joined: Fri Feb 06, 2009 4:37 pm
Location: Wisconsin, USA
Country: United States (us)
Reputation: 0

Sponsored

Sponsor
 


Return to Pneumatic Cannon Discussion

Who is online

Registered users: Bing [Bot], Google [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'