oil and gas piston, change

[antonio s]

Hello.
I'm new and I'm looking for someone who understands dynamic oleum to ask for information, I have a hydraulic piston, which was loaded with oil and nitrogen at about 70bar.

Now it is unloaded, so the idea is to repeat what others have done, i.e., connect a hydroguided pump of car and inject pressure oil to raise the stem, the plunger, then reverse the polarity of the hydroguide pump to bring down the stem.

I hope I could explain.

Don't massacre me, please, but if you please explain to me whether it's feasible or not.

 

[stefanobruno]

Yes, but stay away, that when it all pops out you squirt oil.
hoses, hoses, fittings.
70 bars...boom.

Forget it.

 

[antonio s]

Hello and thank you,
Don't worry, I'm not exploring unknown roads, indeed, it's a very used change on those pistons, which is part of a nautical engine.

I just wanted to understand one thing:
being that the pump of the indroguida pushes the oil in a direction, much have put a two-way electrovalve, therefore, appropriately connected the whole, the circuit works like this:

button one, feed the pump and open the valve 1, then the piston rises.
button two, feed the pump and open the valve 2, then the oil flows backwards into the piston and then descends.

my questions:
if instead of the two electrovalves reverse the polarity of the motor of the pump? Does the circuit work backwards?

if this is not possible what is the ecomic alternative to the electrovalves?

Thank you.

 

[TECNOMODEL]

In my opinion no, you need to send oil in pressure alternately in one room or another of the piston.
If you only reverse the direction of rotation of the pump, if it works, you would aspire from the same room instead of entering the opposite room.

 

[antonio s]

ok, thank you, in fact I had thought the same thing, that aspiring you do not get a good operation.

so it remains to be understood if I can use alternative valves, or taps, instead of costly valves.

the practice I just have to raise the piston before putting the boat in water, so keep it up with a mechanical stop, which already I have, remove the stop and lower the engine, which in fact with its weight you could also lower alone if the oil circuit is open.

finished work, you have to do nothing else.

Thank you.
greetings

 

[antonio s]

Here, I found a 3-way manual valve:
therefore the idea is, connect the pump to the center, the two piston vessels to the two outlets, position one, feeding the pump and then sending oil under pressure in the vase one, position two almond oil in the pot two.

but I don't know if it's okay, because the oil coming out of the vase should not be in pressure should return to the pump, but can it do it with that tap in the photo according to you?

 

[TECNOMODEL]

No, you must have a valve that allows you to download the oil.

 

[antonio s]

Thanks for the answer, kindly can you be more precise and give me an example or a pattern or a photo of what I need?

Thank you.

 

[antonio s]

Could you do with a four-way valve?

 

[TECNOMODEL]

One thing about the generein practice send oil in one cylinder chamber while the other is connected to the discharge, then reverse the situation.

for the 4 way depends how it is made, if it can connect alternately one room to the pump and the other to the discharge I would say yes.

 

[TECNOMODEL]

with this you can do

 

[antonio s]

Thank you, unfortunately I don't have the skills to understand that pattern, so I'll have to study first.

I have a four-way valve in the description :

This valve is used to reverse oil flow from 2 ways to two exit routes. It could be used to control a double effect actuator or to reverse rotation of a hydraulic motor
- - - updated - - - -Could you go?

 

[TECNOMODEL]

I would say yes, if you have an image, a pattern, a code I can try to take a look.

 

[antonio s]

ho solo questa foto per adesso, mi spiace
Thank you.

 

[antonio s]

I think I found the pattern, and it looks like yours.

 

[TECNOMODEL]

If it's the schematic duo I'd say it's okay, you need the one in the open center to download the oil that sends the pump when you have the valve shut.

 

[antonio s]

thanks to the answer, I attach a design, assuming that drawn under is the valve in position one, how do you reverse in flow?

just to understand,
Thank you.

 

[MBT]

there are 4/2 or 4/3 valves that reverse the flow depending on their position
depending on the needs, in rest position there are valves that can stop all flows, allow the pump to discharge, allow the discharge of pressures etc.
in working positions, however, can reverse the flows, send one to exhaust and one to pressure etc.
http://www.boschrexroth.com/ics/con...geid=p544861&history=p544861&displaytype=pictMaybe one of these could help you
Htttp:/www.boschrexroth.com/ics/vor...33,p537335,p537698,p544858,ulgakeid=544874444Consider that you have 90 bar pressure. for me they are fuffigne, but still you need valves and fittings "seri"

 

[antonio s]

Hello, mbt.
thanks to the answer, but therefore, (discussed but I don't understand) that four-way valve, with open center that I had shown, is not okay?

I felt like a good, economical and easy-to-realization solution, as I don't know where to go looking for the products you have indicated to me and actually I don't even know what to take, as you will easily understand I don't understand anything about oleodynamics and so you should explain things to me like a 5-year-old child.

Thank you.

 

[antonio s]

I imagined such an operation, that four-way valve: