Polyurethane Foam - Whats in the valve. This video shows what's inside the valve used on an expanding polyurethane foam can.
I remove the valve from the can, separate the hard inner plastic part from the soft rubber outer part, split the rubber part, and split the plastic part both horizontally and vertically.
In both types of valves, the main part of the valve is 5/32 wide, and goes for about 15/16.
At that point the small valve is 3/32 wide and the large valve is 1/8 wide.
That last part of the valve is about 1/4 deep so the total depth for both valves is 1-3/16.
The valve gets stopped up because the ports inside the valve are tapered. If you don't clean the inner cavities of the port, the small amount of foam left deep inside gets hard, bonds to the rubber part of the valve, and plugs the ports in the plastic part of the valve.
In my next vide, I will show how to clean most of the remaining foam from the deeper parts of the valve and then use a mixture of a special oil and a solvent to keep the remaining foam from setting up.
Until I make that video, here are some things you can do to increase the chances of getting a can to work more than once.
Foam that isn't exposed to air and moisture sets up very slow. If you leave a can setting upright after use, the foam in the straw will seal the end of the straw. The remaining foam won't cure very quick, so it will condense and settle into the ports of the valve. If you leave the can like that for several days, the foam will eventually turn into a hard rock and you won't be able to use the can again.
Instead, if you keep the nozzle screwed tight and lay the can on it's side, or even better, up side down, most of the foam will settle in the far end of the straw before it gets hard. The small amount of leftover foam will harden in the ports and bond to the rubber part of the valve, but it won't be very dense.
The longer you wait between uses, the less likely it is to get the can working again.
When you're ready to try the can again, take the straw apart and clean the two parts with a fine wire.
Look down the can nozzle. If you see any foam, *"gently"* clean it out with a 1/8 drill bit. If you drill thru the bottom of the nozzle, you'll have a drill bit shot thru your skull, your eyes will be glued shut and your lungs will be sealed with foam. Then put the straw back on the can and test the can. Sometimes, the pressure in the can is enough to blow the foam out of the ports. If not, rotate the inner part of the valve while holding the outer part with needle nose pliers. Test the can again. If the foam still doesn't flow, sometimes a chunk of cured foam will come out of the valve and stop up the tiny port in the straw. Remove the straw and make sure it's clear and try again. If it sill doesn't work, the can is ready for the trash.
Just keywords beyond this point
How to use great stuff foam
Reusing spray foam cans
Making a great stuff foam background
How to get spray foam off your hands
great stuff video
great stuff foam hacks
great stuff foam car
great stuff foam removal
polyurethane foam spray can
spray polyurethane foam insulation
spray polyurethane foam shrinkage
spray polyurethane foam application
polyurethane foam art
polyurethane foam molding
PU Polyurethane spray foam insulating sealant expanding caulk glue foam
dow dap ge general electric Loctite Daptex Plus OSI QUAD Pro
Different Brand Great stuff foam touch-n-foam tight foam Gorilla glue adhesive
types gaps cracks window trim Max Fill Kwik foam pond stone pestblock
nozzle valve applicator barrel straw gun can port tube hose tip
cut explode rupture bust blast drain separate drop shake break leak trim release turn
drill rotate broke press mix empty release soak spray screw plug removed pump
test experiment Interesting epic attempt try force work
Latex open closed cell
MSDS material data safety sheet
liquid wet dry time tack free fully total cure cutable
fill expansion expand full seal hole cavities layers filler
apply dispense contact application proper correct
harmful health harm skin hand arm fabric hair
clean cleaner dissolve remove wears off remove wipe
wash water solvent furniture remover soap vegetable oil wd40 petroleum jelly
vegetable oil soap corn PEG polyglycol-based Acetone pumice stone
Dish soap Baby oil peanut Denatured Alcohol lighter fluid
very sticky thick mess quick speed stick slime
Price available Lowes Home Depot Walmart Dollar General local big box stores drug stores
uses tires rocket decoration paint craft prop-making mold mould
polyurithane poliurithane fome
HowToAutoRepair How2AutoRepair h1t1a1r1
Tags: Polyurethane Foam - Whats in the valve, Fixpro256, f1i1x1p1r1o1, HowToAutoRepair, h1t1a1r1, xyzzyHowToAutoRepairxyzzy