DIY pcp air gun valve building.wmv

one way to build a simple "knock open-valve" for homebuilt pcp air guns. A bit long and rather cheesy... You have been warned!
Please se my other video; "diy pcp airgun valve design" for an explanation of this type o valve.

Category:

Entertainment

Tags:

• DIY
• pcp
• air
• gun
• valve
• building

[alehax27]

great video. What material are you using for the valve pin?

[ulanbatorgator]

@alehax27 Hi, the pin is cut from a piece taken from a scrapped printer.

thanks 

[pyronathanpyro]

nice :) im gona build one on a friends lathe also your english well you trying to speak english i actualy understood you better than a fluent english speaker thx man also you know the end of the pin that gets hit by the hammer well how to i stop air leaking out of that bit when it opens ? can i put an o ring on the valve pin its self just past the exit hole ? inside the plastic housing so it stays air tight ? cheers

[ulanbatorgator]

@pyronathanpyro Thanks! You are right aboutthe air loss past the valve stem during fireing.. I have built valves both with and with out o-ring on the stem. The valve built in this video has a stem diam of 2,3mm so it doesn't have enough material to cut a o-ring groove in. As long as you get a good fit between valve stem and the hole the air loss is acceptable.

thanks

[pyronathanpyro]

@ulanbatorgator ahh right will do :) cheers i plan on making the stem like 6-8 mm so i can have room for an o ring if needed cheers :)

[ulanbatorgator]

@pyronathanpyro One thing to consider is that the force needed to knock open the valve is proportional to the "sealed area".. it takes a lot more hammer force to open a valve head with a diam of 10mm compared to a valve head of 5 or 6mm.. Also a bigger diam valve stem means higher weight and more inertia. If you go with a stem of 4,5mm you have enough material to fit an oring, and if you use a 4,5-5mm inlet in the valve body and turn down the stem just behind the head it's good for +900fps...

[samuraimaster93]

great video, u should make more similar videos about hammer valve and pcp

greetings from Serbia

'KOSOVO IS SERBIA!'

[pyronathanpyro]

@ulanbatorgator ill do that then as i will be using soda stream co2 canisters to power it and so on

[alehax27]

@ulanbatorgator

The reason I was asking was because it looked a bit soft. If you've used it before then I'm assuming it works fine.

[pyronathanpyro]

@alehax27 ahh right i sea how would i go about sealing it or shoudl it be ok ? if not i can make a deeper groove and oil it so it doesnt create friction

[alehax27]

@pyronathanpyro

I've read that adding an o-ring to the pin causes extra friction. That extra friction affects the performance.