Great series. Any chance that you could do one on using unmatched hose and fittings and determining a safe compromise to get a customer up and running , as this is a scenario that is common in bush areas with a crimping machine and not a huge stock or range of hose and fittings. Thanks Greg.
Thanks for the Comments gomond1 the answer is Possibly! the key words here are "a safe compromise" and "unmached hose and fittings". Best you give us a real life example and I will try and come up with a solution. We in a pinch we have used medium pressure hose fitting on High pressure hoses by "skiving" the hose and crimping to tail collapse. and high pressure fittings on different or unusual hoses. Try this watching this video for an brief expalanation of what we consider "a safe compromise" ruclips.net/video/XjTlC2XjZQs/видео.html
All bypass and return lines should return to the tank below the minimum oil level, if returning to the top of the tank it is recommended to use a dip pipe to ensure oil returns below the surface. Most tanks have breathers to allow excess air out or to let air in as the oil level drops and rises. Some tanks especially on mobile plant such as excavators have very light pressure relief valves to create a small positive pressure in the tank to help push oil into the pump.
Also, your explanation of the bypass valve is wrong. You had the pressure and suction back to front… where you said the pressure side pushes the spring up and goes back to tank, that’s wrong. That’s the suction side my friend.
@@Hydraulic.Onlineyeah mate. At 4:30 you’re clearly pointing at the suction side, I don’t need to say it’s a dead giveaway because of the bolt holes where the suction flange bolts to.
Anyway your explanation on the solenoid stem being normally closed and energized to open to send oil to close the check is wrong. You’re kinda on the right path. The stem is actually normally open allowing the oil to pass through it and create the circulation within the pump and passing oil through the bypass line if it’s a closed centre circuit or there’s enough back pressure created in an open circuit. Once you energize it, it closes and back pressures the check in turn stopping the pump circulation within itself or through the drain line and creating a full displacement. I don’t know why I’m referring to it as a check because it’s not quite a check valve as it works on pressure differentials through the orifices (note the tiny holes on the “check”)
Great series. Any chance that you could do one on using unmatched hose and fittings and determining a safe compromise to get a customer up and running , as this is a scenario that is common in bush areas with a crimping machine and not a huge stock or range of hose and fittings. Thanks Greg.
Thanks for the Comments gomond1 the answer is Possibly! the key words here are "a safe compromise"
and "unmached hose and fittings". Best you give us a real life example and I will try and come up with a solution.
We in a pinch we have used medium pressure hose fitting on High pressure hoses by "skiving" the hose and crimping to tail collapse.
and high pressure fittings on different or unusual hoses.
Try this watching this video for an brief expalanation of what we consider "a safe compromise"
ruclips.net/video/XjTlC2XjZQs/видео.html
If the bypass line is put into the top of the tank, can this create an air pocket resulting in potential pump failure?
All bypass and return lines should return to the tank below the minimum oil level, if returning to the top of the tank it is recommended to use a dip pipe to ensure oil returns below the surface. Most tanks have breathers to allow excess air out or to let air in as the oil level drops and rises. Some tanks especially on mobile plant such as excavators have very light pressure relief valves to create a small positive pressure in the tank to help push oil into the pump.
Also, your explanation of the bypass valve is wrong. You had the pressure and suction back to front… where you said the pressure side pushes the spring up and goes back to tank, that’s wrong. That’s the suction side my friend.
I am not so sure about your statement Buddy, Can you please provide some proof to back it up?
@@Hydraulic.Onlineyeah mate. At 4:30 you’re clearly pointing at the suction side, I don’t need to say it’s a dead giveaway because of the bolt holes where the suction flange bolts to.
Anyway your explanation on the solenoid stem being normally closed and energized to open to send oil to close the check is wrong.
You’re kinda on the right path. The stem is actually normally open allowing the oil to pass through it and create the circulation within the pump and passing oil through the bypass line if it’s a closed centre circuit or there’s enough back pressure created in an open circuit. Once you energize it, it closes and back pressures the check in turn stopping the pump circulation within itself or through the drain line and creating a full displacement. I don’t know why I’m referring to it as a check because it’s not quite a check valve as it works on pressure differentials through the orifices (note the tiny holes on the “check”)
@@Hydraulic.OnlineI mean it’s easy enough to google OMFB, Hydro Leduc, Interpump etc schematics to back up my statement.