13/13 I would like to reiterate the fact that THERE IS NO HEAVY TECHNICAL VOCABULARY! It is refreshing to watch an engineering video that is straightforward and visually aiding.
@@martynasvizbaras1180 basically everything is built into the closed loop system . enough room for oil and the control valves. seems like the open system is more user friendly. easier to repair.
Really many many thanks for your your existence, and the videos you upload. I've been trying to understand the hydraulic system on the bulk carrier ships i work and you are definitely helping.
A very good video. Very well explained with the help of equipment. There are no clutters in the explanation and hence easy to understand. Thanks very much...
Great video mate very descriptive. My favourite part was how you drew the hoses on the white board demostrating whats happening then showing us physically afterwards. Thank you for the content
Very well done. I am fluid power certified hydraulic mechanic with 40 yrs. Exp. Best video i have seen. Here in the US we say Open Center and Closed Center. But great job
Awesome video. I learned practical things that i did not fully understand due to the limitation that i studied it through books only. Thanks. Keep it up please
Very helpful and informative! I loved the way you demonstrated your point: by sequentially adding parts and explaining the differences in the state of the loop as you went.
But here is a flaw concerning the open loop system. Directional control valves are usually proportional. You can control the speed with the lever pretty well. You don't normally need any flow control valve that increases unneccessary pressure, energy consumption, heating and wear on the pump.
On every tractor, loader, excavator etc with a fixed displacement pump for the working functions you control the hydraulic cylinders and even motors by the levers on the control valve and rarely any flow control valve is used. Controlling the speed of a cylinder is pretty much like controlling the speed of a motor.
@@ontheroadagain4773 Exactly. In most cases, you don't need a flow valve when you have a control valve that will do the same. The systems with solenoid control valves you do if you don't want full flow on part of the circuit.
Good presentation. In summary from my past experience as an ex hydraulic engineer. Closed loop systems primarily used in mobile applications where a compact design is needed and a direct, dual direction connection is required between a single pump and motor or motors. Advantages: compact design due to smaller tank, smaller hydraulic pipes, less valves. Disadvantages: expensive components, often variable dual direction pumps and/or motors, design limitations in adding additional end uses, unequal displacement end users users (such as standard cylinders). Open loop systems primarily used in static industrial systems. Advantages: lower component costs and unlimited design options, multi independent actuators from a single system. Disadvantages: bigger tank capacity required, bigger pipes on the return side, separate valves.
@Ask APT No, moved out of the field 21 years ago. Still very passionate about all hydraulic. While mechanically I would imagine the systems remained similar, I am sure on the control side, there have been good developments over the past 20 years. All the best.
I also taught hyd and some folks just never really unstand how it works 😊 No matter how you explain it to them 😢 I loved working but had to retire at 68
Just watched your Great video, very well done!. I learnt hydraulics 35 years ago, as a mechanical fitter working on presses and factory equipment, just a mention that the swash plate in a axial piston pump changing positions may not just change displacement volume, but also can change its relative position to the inlet and outlet ports on certain pumps!. What amazes me is the service life of some equipment may have been from WW2.😂 All gone now I imagine!
Great video , can you make a video on how to correctly add a oil cooler , return side , with all the components and options like how much oil to put through the cooler , GPM flow etc . Cheers
Good explanation . Closed loop systems would generally have some kind of top up or boost pump incorperated to keep a contant gpm. also without a top up a possibility of cavitation could occur. If there was some kind of drag/force holding the wheel then pressure would build up thats why a PRV would be installed to divert back to tank. hense the reason for a boost pump to keep the fliud topped up. and hense the reason the tank is still there.
closed loop is used in transmissions in just about every construction, forestry and farming machines these days, open loop is for hydraulic cylinders where the oil needs to be returned to a tank as the oil amount varies to and from the hydraulic rams/cylinders.
@@braddavis4377Automatic cars have a torque converter, comparable to this closed loop with a fixed swash plate angle. Pumping fluid creates drag so its really only good for high torque low speed
On a car, the open loop system is the better choice for a lot of reasons! The variable speed ability is taken over by the engine, and gives you the ability to use sliding vane or gerotor pumps for simplicity and longevity. An example is a power-steering assembly. These systems pump fluid through an a little hole (called an orifice). At low engine speed, the orifice is too big to be a restriction, and the car is likely parked or has low duty requirements, so drag isn't a problem. You can turn your power steering pump with your hand! Pressure gain has exponential characteristics. Doubling engine speed will quadruple the pressure, and the engine often goes over 10-times the idle speed. Any shock loads against these systems are typically resolved with the tremendous amounts of momentum in the engine. For an Electric motor that rotates at a fixed frequency (60hz, geared down to whatever suits your nominal shaft torque requirements and pump speeds), the closed loop system makes sense, but has its own sacrifices. For example, we might need a sudden burst of speed. The motor often can't cope with this, or becomes a reactive load for the power source. The work-around is to have a huge flywheel on the motor. If you're dealing with shock loading, the flywheel will give you all of the load you could ever want, but the shock loads can trigger your safety valves, causing the system to go backwards.
Automatic transmissions have open-loop systems that are optimized for the duty at hand. You have control over engine speed and should be mature enough to know what kind of gear shifting duty the transmission would ever need to do. Given that information, an open loop system can be made, such that its mode of failure is known and forced to happen for safety reasons.
This guy really knows how to teach. But I would suggest for a more tidy environment especially since its a video presentation. One can easily be distracted. Also I suggest that different colour hoses be used for 'send' and return lines. But I really like how he teaches. keep it up. What textbooks are recommended for the study of hydraulics installation and repair?
Very cool I am watching this and all of a sudden a light comes on and this is my John Deere transmission driving lawn mower I rebuilt, basically I changed about 40 Orings & a couple of shaft seals they wanted a thousand dollars for a new one I bought a rebuild kit for 80 dollars I must of fixed it still working after two years !! LOL
Great video, it visualization gave me a better understanding with its explanation of course but als intrigued me. Like how fixed is the motor as it’s closed off and does the restriction valve boost the power too besides restrictions the pump?
But this isn't how an open loop system works in practice. Directional control valves are usually proportional. You can control the speed with the lever pretty well. You don't normally need any flow control valve that increases unneccessary pressure, energy consumption, heating and wear on the pump. But in systems with solenoid control (on-off function) valves you need flow control valves if you don't want full flow on part of the circuit.
Thank you that was very informative, a question on this though, in case I want to control not just the direction of the tyre but also the I need multiple functions using the same pump(HPU) in that case an open loop system would be the only option as I can have the feed line to the pump on a control panel and the return line on the tank section of the control panel and have multiple ports at the panel for different functions. and this cannot be achieved in a closed loop system as the return isn't going to the tank but the pump itself, am I right?
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A very well presented video, with clear uncomplicated use of English Language, and obviously well-prepared visual aids.
10/10 for this one!
9/9 how do you fill the closed loop system with oil without tank, thats what i missed the most :(
Brian Gillis Baie has
13/13 I would like to reiterate the fact that THERE IS NO HEAVY TECHNICAL VOCABULARY! It is refreshing to watch an engineering video that is straightforward and visually aiding.
@@martynasvizbaras1180 basically everything is built into the closed loop system . enough room for oil and the control valves. seems like the open system is more user friendly. easier to repair.
The best demonstration I found so far, it is really best to explain while showing the actual system work at the same time.
This is the best and most clearly explanation of closed and open loop systems I’ve ever seen. Thank you for the post!!
Excellent demonstration. Thanks for taking the time to do this.
This is the best, simple, practical explaination I have seen on youtube for this subject matter.
Well stated👍
I don't think it is the best simple practical explanation but it's not bad for a beginner.
Best explanation of this I've ever seen.
Well done and thank you.
Super nice presentation. Good understandable language, no dumb loud music.
Thank you and keep up the good work
Really many many thanks for your your existence, and the videos you upload. I've been trying to understand the hydraulic system on the bulk carrier ships i work and you are definitely helping.
The most excellent presentation ever.
I've understood the concepts I've been missing for year.
A very good video. Very well explained with the help of equipment. There are no clutters in the explanation and hence easy to understand. Thanks very much...
this was honestly a well made video. straight to the point. I learnt something today thanks.
Good explanation how the hydraulic pump works.This gentleman makes it easy to understand
wow i got this i thought it was going to trigger headache but the explanation has gone so well and i really enjoyed it thank you so much
the best illustration of open and closed systems. thanks sir
Great video mate very descriptive. My favourite part was how you drew the hoses on the white board demostrating whats happening then showing us physically afterwards. Thank you for the content
Absolutely clear and concise. Brilliant. Thanks!
Very well done. I am fluid power certified hydraulic mechanic with 40 yrs. Exp. Best video i have seen. Here in the US we say Open Center and Closed Center. But great job
Awesome video. I learned practical things that i did not fully understand due to the limitation that i studied it through books only. Thanks. Keep it up please
Very informative. Thanks for sharing. I just bought my first tractor and this will help me comprehend how to hydraulic systems work on it. God Bless.
This guy explains things so well. Natural teacher.
Very helpful and informative! I loved the way you demonstrated your point: by sequentially adding parts and explaining the differences in the state of the loop as you went.
But here is a flaw concerning the open loop system. Directional control valves are usually proportional. You can control the speed with the lever pretty well. You don't normally need any flow control valve that increases unneccessary pressure, energy consumption, heating and wear on the pump.
On every tractor, loader, excavator etc with a fixed displacement pump for the working functions you control the hydraulic cylinders and even motors by the levers on the control valve and rarely any flow control valve is used. Controlling the speed of a cylinder is pretty much like controlling the speed of a motor.
@@ontheroadagain4773 Exactly. In most cases, you don't need a flow valve when you have a control valve that will do the same.
The systems with solenoid control valves you do if you don't want full flow on part of the circuit.
It was clear, simple, and viable. Thank you so much.
Thanks for the great video,,,like everyone said, very clear with vocabulary and visual aids and no annoying music
You the best hydraulics tutor on TH-cam right now,Respect🙇🏽♂️
A very excellent video presentation- clear, simple, and succinct. Many Thanks for this, really really appreciate it!
Fantastic explanation,even a layman can understand ❤
Really well put together! learned loads! thanks dude!
Awesome demonstration! Great job explaining this
Good presentation. In summary from my past experience as an ex hydraulic engineer. Closed loop systems primarily used in mobile applications where a compact design is needed and a direct, dual direction connection is required between a single pump and motor or motors. Advantages: compact design due to smaller tank, smaller hydraulic pipes, less valves. Disadvantages: expensive components, often variable dual direction pumps and/or motors, design limitations in adding additional end uses, unequal displacement end users users (such as standard cylinders). Open loop systems primarily used in static industrial systems. Advantages: lower component costs and unlimited design options, multi independent actuators from a single system. Disadvantages: bigger tank capacity required, bigger pipes on the return side, separate valves.
@Ask APT No, moved out of the field 21 years ago. Still very passionate about all hydraulic. While mechanically I would imagine the systems remained similar, I am sure on the control side, there have been good developments over the past 20 years. All the best.
Absolutely perfect presentation!
Great job. Loved it. Greatly appreciated.
Thanks for the video.... very well made! Easy to understand the basics!
Good explanation of the main two kinds of hydraulic system differences.
The yeare is 2024 and this video is helping me with my A&P hydraulics class better than my instructor! Thank you so much for the amazing video!!!
Excellent explanation. Thank you for this!
Visual learning is way better than theory training. Great job! Keep the vids coming.
Thank you ! Keep it up . appreciate it .
I taught hydraulics for John Deere techs at a Technical College. This presentation is SUPER GOOD. Every Tech should see this one. Great Job!!!
I also taught hyd and some folks just never really unstand how it works 😊
No matter how you explain it to them 😢
I loved working but had to retire at 68
Great video, I will definitely recommend this training to others.
A very well presented good job and thanks for the great information
Excellent presentation bro. I really appreciate the good explanation.
Brilliant clear concise video. Thanks
Have a good explanation.
Very thanks
Excellent presentation!
Great video demonstration. Thank you!
I learned in this 10 minutes more than those hours in the class!
thanks bro , it was easy to understand basics of hydraulics. Keep it up
It's so clear to understand, thank you so much
Thanks you very much from Egypt
Just watched your Great video, very well done!. I learnt hydraulics 35 years ago, as a mechanical fitter working on presses and factory equipment, just a mention that the swash plate in a axial piston pump changing positions may not just change displacement volume, but also can change its relative position to the inlet and outlet ports on certain pumps!. What amazes me is the service life of some equipment may have been from WW2.😂 All gone now I imagine!
Thankyou soo much.very easy and simple way of teaching.I really appreciated.
Awesome video! Thank you 😊
Good clear and simple explanation. Top marks
Good stuff man
wonderful accesible cogent clarity!
Thank you for the well informed video. Came out great.
the best video on this topic, we learned so much
Excellent Infomation and clear understanding method. Thanks.
Wow, well done; thank you so much!
Thank u soooo sooo much!!!
You made it clear ..
Wow, simply awesome 😊😊
Great job. I feel these would be awesome in cars and trucks
This lad will go far. Thx
excellent demonstration. THANK YOU
Best explanation so far!!! How do I learn more? where? And thank you for sharing this!
Great video , can you make a video on how to correctly add a oil cooler , return side , with all the components and options like how much oil to put through the cooler , GPM flow etc . Cheers
There should be oil cooler in closed hydraulic system..
As the hydraulic oil on heating reduces the efficiency..
amazing video, thank you for making this video. really helpful for students like me,
Nice class!! My old tractor vs my new zero turn mower, Now I get it :) Thanks!!
It clears the concept of open & closed loop pump
Good explanation .
Closed loop systems would generally have some kind of top up or boost pump incorperated to keep a contant gpm. also without a top up a possibility of cavitation could occur.
If there was some kind of drag/force holding the wheel then pressure would build up thats why a PRV would be installed to divert back to tank. hense the reason for a boost pump to keep the fliud topped up. and hense the reason the tank is still there.
closed loop is used in transmissions in just about every construction, forestry and farming machines these days, open loop is for hydraulic cylinders where the oil needs to be returned to a tank as the oil amount varies to and from the hydraulic rams/cylinders.
Why are they not used in cars: Is there torque multiplication, Can they be used for high speed?
Wait why not use a closed loop since then you just have a pump on every ram instead of one with a complicated valve system?
@@braddavis4377Automatic cars have a torque converter, comparable to this closed loop with a fixed swash plate angle. Pumping fluid creates drag so its really only good for high torque low speed
On a car, the open loop system is the better choice for a lot of reasons!
The variable speed ability is taken over by the engine, and gives you the ability to use sliding vane or gerotor pumps for simplicity and longevity. An example is a power-steering assembly. These systems pump fluid through an a little hole (called an orifice). At low engine speed, the orifice is too big to be a restriction, and the car is likely parked or has low duty requirements, so drag isn't a problem. You can turn your power steering pump with your hand! Pressure gain has exponential characteristics. Doubling engine speed will quadruple the pressure, and the engine often goes over 10-times the idle speed. Any shock loads against these systems are typically resolved with the tremendous amounts of momentum in the engine.
For an Electric motor that rotates at a fixed frequency (60hz, geared down to whatever suits your nominal shaft torque requirements and pump speeds), the closed loop system makes sense, but has its own sacrifices. For example, we might need a sudden burst of speed. The motor often can't cope with this, or becomes a reactive load for the power source. The work-around is to have a huge flywheel on the motor. If you're dealing with shock loading, the flywheel will give you all of the load you could ever want, but the shock loads can trigger your safety valves, causing the system to go backwards.
Automatic transmissions have open-loop systems that are optimized for the duty at hand. You have control over engine speed and should be mature enough to know what kind of gear shifting duty the transmission would ever need to do. Given that information, an open loop system can be made, such that its mode of failure is known and forced to happen for safety reasons.
Thank you very much! your video is very easy to understan and clear.
Best explanation ever, Thank you.
Excellent explanation😀
excellent video, really helped me understand a few things. One subscription right here.
Fantastic Bravo simple and straight forward
Thanks. Good clear training
very simplified & helpful vdo, plz make more vdos like this. thank u
Very informative, thank you.
i really love your explanation
well done ,thank you so much for this video and information
This guy really knows how to teach. But I would suggest for a more tidy environment especially since its a video presentation. One can easily be distracted. Also I suggest that different colour hoses be used for 'send' and return lines. But I really like how he teaches. keep it up. What textbooks are recommended for the study of hydraulics installation and repair?
a discussion about balanced close system and therefore very little heat could be included. Nice presentation.
I like it.. im a member to your channel now..
This is genius design ...thanks
Fantastically simple explanation. Thank you very much for posting this video.
very informative and well explained
Very informative video... thank you
Excellent video!
Just awesome...thank you very much Sir.
Very cool I am watching this and all of a sudden a light comes on and this is my John Deere transmission driving lawn mower I rebuilt, basically I changed about 40 Orings & a couple of shaft seals they wanted a thousand dollars for a new one I bought a rebuild kit for 80 dollars I must of fixed it still working after two years !! LOL
Excellent video, thank you!
Great explanation !
Very informal. Thank you Very Much !
Well done young man.
Great video, it visualization gave me a better understanding with its explanation of course but als intrigued me. Like how fixed is the motor as it’s closed off and does the restriction valve boost the power too besides restrictions the pump?
Excellent video
omg thank you so much for sharing such a awesome video. It is very understandable and easy for beginner.
But this isn't how an open loop system works in practice. Directional control valves are usually proportional. You can control the speed with the lever pretty well. You don't normally need any flow control valve that increases unneccessary pressure, energy consumption, heating and wear on the pump.
But in systems with solenoid control (on-off function) valves you need flow control valves if you don't want full flow on part of the circuit.
very nice info about hydraulic system thank you very much
Thank you for the great explanation!
What is the type of the motor on the closed loop system?
Thank you that was very informative, a question on this though, in case I want to control not just the direction of the tyre but also the I need multiple functions using the same pump(HPU) in that case an open loop system would be the only option as I can have the feed line to the pump on a control panel and the return line on the tank section of the control panel and have multiple ports at the panel for different functions.
and this cannot be achieved in a closed loop system as the return isn't going to the tank but the pump itself, am I right?