grit valves for cheap pots

[Brad93]

a lathe and a welder is all that is needed to make the pots and some metal a bottle .time and enthusiasm

I have on of the pots from eBay just sitting there, I can plum it in to my sandblasting cabinet if it all works better.

 

[brightspark]

for the valves 3 inch minimum 4 would be real nice. I have made the patterns up for the 4inch to make them out of cast alloy its quicker to machine and half made . my bruv casts them for me in his small foundry did have the piccys for the castings but lost them will do some more heres the half finished article

 

[Brad93]

I’ll just get a lump of something. I have 90mm but sure there is thicker somewhere

 

[brightspark]

steel can be used or ally for the body

 

[brightspark]

heres the bits

 

[Brad93]

heres the bits

That central hole is it ⅜” BSP or ⅝” BSP?

looks bigger than 15mm

 

[brightspark]

That central hole is it ⅜” BSP or ⅝” BSP?

looks bigger than 15mm

that valve has half inch bsp both sides on my pot that runs at 90cfm on the mobile comp with a 6mm jet the smaller blaster has the 3mm jet and the valve has half inch bsp inlet and 3/8 th bsp outlet

 

[Brad93]

that valve has half inch bsp both sides on my pot that runs at 90cfm on the mobile comp with a 6mm jet the smaller blasdter has the 3mm jet and the vaslve has half inch bsp inlet and 3/8 th bsp outlet

Perfect thanks.

I will Probably run the small pot from the hydrovane in the workshop. Think that’s 40CFM or there abouts. Should be enough air in a glove box.

I’ll go ½” inlet, ⅜” outlet.

cheers

 

[brightspark]

god my typing is getting worse gotta check more before I post

 

[Brad93]

Starting on our small pot to hook up to blasting cabinet today.

first thing first.

Where can I get a new ¼” BSP safety/relief valve?

Guessing I want a valve that lets got at 125-140PSI on these Chinese import pots?

secondly, the output on the bottom of the pot is ⅜” BSP. Is that too small? Should I make it a bit bigger before making the grit valve?

 

[Brad93]

heres the bits

Where did you get that proper little blast hose?

 

[Brad93]

Would this be big enough? @brightspark

 

[brightspark]

Would this be big enough? @brightspark

ideal ready made just cut a section out about 3/4 of an inch and make an endcap either side out of some 10mm plate and bolt it all together with 8mm nuts and bolts

 

[brightspark]

just noticed its best to have a half inch bsp outlet on bottom of the pot to the valve my blast hose is 10mm bore steam hose I scrounged ace engineering sell decent hose that will work on the 3mm jet. heres the list prices on the hose and blast jets https://www.blastitclean.co.uk/page12.html

 

[Brad93]

Where do you buy the fittings? Just plain malleable iron?

 

[Brad93]

And what sort of gasket do you use between?

 

[Brad93]

Will drill this hole out in the bottom of the pot and tap that ½” BSP first job.

 

[brightspark]

I just made my own steel boss to weld under tank and threaded it half inch bsp. im sure the rest are iron welded in no need to bother using a gasket on the valve faces . just a smear of silicone

 

[Brad93]

I just made my own steel boss to weld under tank and threaded it half inch bsp. im sure the rest are iron welded in no need to bother using a gasket on the valve faces . just a smear of silicone

Yeah I think I’d cut this one out to be honest and make the boss in the lathe.

what about a spring for the handle?

 

[brightspark]

Yeah I think I’d cut this one out to be honest and make the boss in the lathe.

what about a spring for the handle?

is that the one on the slide valve spindle? no 8 on the exploded view in post 1