JimMorrissey
Veteran Member
Will a 3000psi system destroy a 2500lb cylinder over time? I'm wondering because I have ready access to 2500psi cylinders at Tractor Supply and my machine has 3000psi of pressure. Thanks.
cylinder pressure
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RonMar
Elite Member
Yes.
How fast depends upon how often you load the system up to beyond 2500 PSI. Best case failure would be the seals around the shaft start to leak then spray. Worst case is the cylinder wall ruptures. Depending upon how it is installed, this could lead to a catistrophic failure(cylinder collapse/fold).
You could set the safety relief pressures down on your machine to limit the system pressure to 2500 PSI or less, then the cylinders you are looking at would last as long as they normally would last given the operating conditions involved.
How fast depends upon how often you load the system up to beyond 2500 PSI. Best case failure would be the seals around the shaft start to leak then spray. Worst case is the cylinder wall ruptures. Depending upon how it is installed, this could lead to a catistrophic failure(cylinder collapse/fold).
You could set the safety relief pressures down on your machine to limit the system pressure to 2500 PSI or less, then the cylinders you are looking at would last as long as they normally would last given the operating conditions involved.
OP
JimMorrissey
Veteran Member
Thanks Ron. Since I'm moving some heavy rocks, and in light of your comments, it seems to make sense to use a matching cylinder for my machine's system....just order a 3000psi unit off the Web.
I figured it would eventually damage it, but didn't realize it could be total destruction for the extra 500psi.
I figured it would eventually damage it, but didn't realize it could be total destruction for the extra 500psi.
Pooh_Bear
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I think you can get a special inline relief valve.
So you hook your 3000psi line to the relief valve.
Then hook your 2500psi downstream system to the other side of the valve.
and hook a third line as a return to the tank.
If the pressure goes above 2500psi the relief valve diverts the extra to the tank.
At least I think thats what the valve does that I am
looking at in the surplus center catalog.
If not, somebody should invent one of these quick.
Pooh Bear
So you hook your 3000psi line to the relief valve.
Then hook your 2500psi downstream system to the other side of the valve.
and hook a third line as a return to the tank.
If the pressure goes above 2500psi the relief valve diverts the extra to the tank.
At least I think thats what the valve does that I am
looking at in the surplus center catalog.
If not, somebody should invent one of these quick.
Pooh Bear
OP
JimMorrissey
Veteran Member
Thks Pooh.
JimR
Elite Member
Cylinders are rated for certain pressures. They also have a built in safety factor. Otherwise they would be blowing at 2500 psi. if only rated for 2500psi. If the piston in question was one of the rod bolt type I would not use it. If it was a one piece type piston I would use it. How many times have you overloaded your bucket cyclinders by either trying to push something with the bucket like a tree with your tractor or trying to move a boulder? Did the cylinders break? I'm sure that with the extra weight of the tractor the exerted force on the cylinder was above 2500 psi.
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JimMorrissey
Veteran Member
That's a good point about the excessive pressures on the cylinders when overloading a machine in whatever situation. I'll end up ordering a 3500lb unit.
JimR
Elite Member
</font><font color="blue" class="small">( That's a good point about the excessive pressures on the cylinders when overloading a machine in whatever situation. I'll end up ordering a 3500lb unit. )</font>
Jim, I've had some serious instances where I know I put a lot more pressure on a cylinder than what it is capable of handleing. I wouldn't worry too much about the cylinder exploding or such from overpressure. I even bent a 2" rod on a piston once on my old backhoe that I owned. The cyclinder held up fine. I have yet to know of anyone that blew a piston apart before a hose blew. I wouldn't worry too much about going overboard on a high pressure piston. What are you planning on using this for?
Jim, I've had some serious instances where I know I put a lot more pressure on a cylinder than what it is capable of handleing. I wouldn't worry too much about the cylinder exploding or such from overpressure. I even bent a 2" rod on a piston once on my old backhoe that I owned. The cyclinder held up fine. I have yet to know of anyone that blew a piston apart before a hose blew. I wouldn't worry too much about going overboard on a high pressure piston. What are you planning on using this for?
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JimMorrissey
Veteran Member
Wanted to used it for a rock grapple I'm thinking about and assorted other things....just wondering because my system is 3K and pretty much every cylinder I see is rated for 2500.
MadDog
Platinum Member
Jim: There are plenty of cylinders rated for 3000psi available at Northern Tool, Surplus Center and Baileys.
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JimMorrissey
Veteran Member
Yep....just easier to drive down the street to TSC. Surprised they don't have any.
dfkrug
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pat32rf
Veteran Member
Jim M- I wouldn't use an underpressure cylinder on a wood splitter or for a load lift function, but to position a grapple, i wouldn't think it would take the full 3000psi, as long as you don't make a habbit of holding it against the stops ona regular basis. I have blown hoses, but never a cylinder on my FEL or BH. /forums/images/graemlins/blush.gif(normally from a shock load, where the pres relief couldn't let go) Pat
