Pressurized Hydraulic Reservoir [1<P<5] psig
Pressurized Hydraulic Reservoir [1<P<5] psig
(OP)
I am looking for an economical and reliable method to provide a small mobile hydraulic reservoir with a small amount of positive pressure. Looking for component recommendations for the following ideas.
1. Use air over oil volume as accumulator.
Tmin = 32F, Tmax = 150F.
System always draws oil from reservoir nominal.
Worse case system draw is 13 in^3.
Nominal air volume is 380 in^3.
Need vacuum breaker and relief device for safety??
2. System has access to pressurized air. Would need to filter and remove water from air.
Need regulator/relief to maintain pressure??
Other ideas include a bladder accumulator, but this is expensive. What about a small spring return pneumatic cylinder as an accumulator?
Any other ideas?
1. Use air over oil volume as accumulator.
Tmin = 32F, Tmax = 150F.
System always draws oil from reservoir nominal.
Worse case system draw is 13 in^3.
Nominal air volume is 380 in^3.
Need vacuum breaker and relief device for safety??
2. System has access to pressurized air. Would need to filter and remove water from air.
Need regulator/relief to maintain pressure??
Other ideas include a bladder accumulator, but this is expensive. What about a small spring return pneumatic cylinder as an accumulator?
Any other ideas?





RE: Pressurized Hydraulic Reservoir [1<P<5] psig
Valuable advice from a professor many years ago: First, design for graceful failure. Everything we build will eventually fail, so we must strive to avoid injuries or secondary damage when that failure occurs. Only then can practicality and economics be properly considered.
RE: Pressurized Hydraulic Reservoir [1<P<5] psig
Mike Halloran
Pembroke Pines, FL, USA
RE: Pressurized Hydraulic Reservoir [1<P<5] psig
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Ted
RE: Pressurized Hydraulic Reservoir [1<P<5] psig
'Mobile' equipment: Do you have turbocharger air pressure available? I have seen that several times.
Do you have to have guaranteed positive pressure on startup? If not, a simple pressure vacuum breather may work. The system pressure would build with heat. We use the Bruning, now Parker, -.3 psi to +3 psi I think.
I have an acquantaince who does undersea hydr stuff with pressurized small tanks. I will check with him.
We also use the Greer, also now Parker, KleenVent breather bag. Effective, but they are really big.
kcj
RE: Pressurized Hydraulic Reservoir [1<P<5] psig
In the subsea industry, we call these items compensators. Several companies make them, including my own. Charge pressures tend to be a little higher than you prescribe- 7-15 psi is typical, but every manufacturer has a different standard. We just released a 1 gallon model with 4-5 psi pressure.
I am not sure about the policies of self promotion on this forum, so I'll give some references, including my own company.
DOER Marine (this is an older data sheet that does not list the new 5 psi availability)
ht
Schilling Robotics (no direct link on their website, but I know they make them as we have one in our shop)
Perry Slingsby
http://w
Sound Ocean Systems
htt
Technadyne
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A Google search will probably turn up more manufacturers.
I would be happy to offer opinions on features, if you like...