Need Hydraulic Tips
Need Hydraulic Tips
(OP)
I'm making a custom hydraulic hand pump and a cylinder. But before I start, I need some tips/answers from you expert engineers.
Why Guide/Wear ring is used ? I read some place it absorbs transverse forces and it prevents metal-to-metal contact. I do understand how guide ring works, but why ? What wrong with metal to metal contact ? and how can it absorbs transverse better than metal touching the metal ?
Another question is, what seal is better for pump piston ? Usually I see O-ring is used with a backup ring. But I think O-Ring doesn't last long. In some hand pump piston, I saw leather seal. But what is the best seal for 12mm pump piston ? Can I use V-Seal for it ?
Why Guide/Wear ring is used ? I read some place it absorbs transverse forces and it prevents metal-to-metal contact. I do understand how guide ring works, but why ? What wrong with metal to metal contact ? and how can it absorbs transverse better than metal touching the metal ?
Another question is, what seal is better for pump piston ? Usually I see O-ring is used with a backup ring. But I think O-Ring doesn't last long. In some hand pump piston, I saw leather seal. But what is the best seal for 12mm pump piston ? Can I use V-Seal for it ?





RE: Need Hydraulic Tips
V-shaped seals will work.
What is the fluid and pressure?
Ted
RE: Need Hydraulic Tips
For pump piston, I just need to know which seal should I use ? O-Ring or V-Ring ? The problem with V-Ring is that, the pump piston diameter is 12mm and I cant seem to find V-Ring with 12mm OD.
I'm not sure about fluid and pressure. I'm thinking of using general hydraulic oil and cylinder should be able to lift 5-10 ton.
RE: Need Hydraulic Tips
Same answer re guide rings on the cylinder piston, assuming ram style cylinder. Guide rings allow larger piston tolerance and prevent metal to metal scoring.
Ted
RE: Need Hydraulic Tips
And if I use polished cylinder and Piston without guide ring, would they still make scratches ? I can put guide ring on cylinder Piston but it won't be easier to put guide ring inside a bore for rod. Because there is a rod attached to Piston that will do the lift.