Very well explained . Ive experienced this very thing . On a 20 tonne Cat excavator we had a thumb installed and used a old Hitachi boom lift ram off a 10 tonne Hitachi . The Hydraulic hose guy we got to plumb it up only used 3/8 hose and a 3/8 cross line relief valve . The bucket hoses on the Cat were 3/4 . When grabbing a lot of trees and rubbish the cylinder shattered in half. We replaced it and it did it again about a week later . We got and expert hydraulic man to take a look and he replaced everything with 1/2 inch and the problem went away . The oil just could not return fast enough through the 3/8 system . The danger of using people that know enough to be dangerous and a costly lesson . The technician that fix it said that it could have cause a spike as much as 20000 psi inside the cylinder . Just completely chopped it in half
Very informative and quite interesting. From your demonstration, it's easy to see how you could generate too much pressure in a hydraulic cylinder especially when it bottoms-out. A very dangerous situation. Thank you.👍🏽🤠 4/10/23
Great explanation! Very easy to understand this. Since there is less surface area of the side with the restrictor due to the piston rod, that side will build a higher fluid pressure to balance the push against both sides of the piston. However, I think that the less the restriction of flow, there is more relief to reduce the higher pressure differential. I find that there are one-way flow restrictors to eliminate need to a directional bypass. I had to subscribe.
thanks sir, a very good idea.. we exploded one cylinder twice by giving more pressure in extraction and now only i came to knew why.. nice job. upload more videos.
Bravo.Clean and crystal clear 🤝 It would be a great help if you teach us how to manufacture a Double acting cylinder. With circuit Diagrams,Design & material selection.
I want to build a hydraulic system and I need t work out what size pump to use...I got a 6 horse power Kubota diesel...that is the starting point...I am building a log splitter maby one 30 ton cylinder ....do you have a video to explain
Very good videos, have you changed your page as I notice you haven't posted any videos in a while? Also is this pressure increase ever used on purpose?
Hi , by changing a bucket hydraulic cylinder ,do 8 have to bleed lines. I used my tractor to blow wet snow an things worked for about 5 hrs, then lost pto lift an bucket lift. Any thoughts on what I should look at to trouble shoot an fix. Thanks R9b
There actually is one very good reason to use a meter out flow control valve. If you have an overhung load on the cylinder (the load can pull or push the rod), with meter in, the load can produce a vacuum within the cylinder and travel unexpectedly. With meter out, it will be fluid locked and can not be pushed or pulled by the load. Much safer. Just use components capable of handling the pressure.
How is the pump relieving pressure when the hand valve is in the neutral position? Is it going through the hand valve back into the tank, the red line?
Is there a way to reroute your ram end pressure line with a relief valve on return to valve bank that would push that oil straight back into the base end of the cylinder for a faster extending of the ram ?? Kinda like an ER system
ive watched this a few times, i understand your correct way of limiting the speed to the back of the cylender, but you only showed the 'wrong' way to attach the flow control valve to the top end. IS the correct way just the other way around? (if i want to limit the retraction speed - to make them the same) i'm hoping to make my own little excavator. many thanks for these videos they are so great and helpful cheers from the UK o/
Dear sir, Firstly if we close rod end of this piston then we put pr in a confined hydraulic so how pr is increases? Also as the system pr is same for area difference of the piston head end & rod end force is different but pr should be same. I still not understand how pr increases? Plz explain anyone.
so meter out is not the way to go, it will increase the pressure, build up heat which is not good for the system i suppose, correct me if i am wrong, thanks.
Is there a flow control valve to regulate even flow to 4 cylinders at once? I'm trying to make/operate 2 scissor lifts simultaneously to lift the rear of a truck up 20" to dock height. So 1 scissorlift on each rear corner of the truck and 2 cylinders on each scissorlift. They'd be driven off a drive powered by a 12vdc battery. I'm not far into planning this yet so.....
Hi David, there are methods such as using flow divides or phasing cylinders that allow for almost even extension speed of cylinders. For the application you described however it sounds like you will need some electrical control/monitoring and would best off consulting an expert for assistance.
One question i have an electric dual hydraulic pump but need to use on a single cylinder can i still manage to use the dual hose electric pump with that single cylinder? Is there a y adapter that can make that possible?
Hi there, we are doing a live Q&A tomorrow at 7:30am (NSW) - join us live and we might answer this question for you. Join us here: facebook.com/events/176497570992728/
I have a small trailer that has a hydrolic hand jack to raise turn lever and it goes down I am changing to a hydraulic cylinder with hoses to run back to valves on my sub compact tractor. What kind of cylinder do I look for to raise and lower bed ? Wagon capacity is 2000 lbs
Hi Roy, we would like to help you with your questions - we gathered questions, like this, for our live Q&A tomorrow. Join us there and we might answer this question for you: facebook.com/events/176497570992728/
I noticed the same thing. If he installed the valve like he had it on the board I thought it would have stopped the flow creating the 150 bar without him needing to close the valve..
Cool! Ok so how do you maximize the speed in both directions (and have them at least the same) to get the fastest cycle times? Also, what effect does speeding up the cycle have on the max force that a cylinder can generate?
To maximize the speed in the extension direction you would have to adjust the circuit to make it a regenerative Circuit. Regenerative Circuits increase the extension speed of a double acting cylinder by taking return oil from the rod end and use it in the piston end to speed up extension. but in a regenerative circuit reduced cylinder force is a major disadvantage.
@@CustomHydraulics I don't know of any way to "adjust" a basic circuit into a regenerative circuit. You'd have to redesign it. Besides, a regen circuit is most effective only when the piston diameter to rod diameter ratio is greater than 2:1. The simplest way to achieve equal force for extension and retraction is a to use a double rod end cylinder-and it may not require redesigning the circuit. To achieve the same extension force as with the single rod end cylinder, you'd have to use a double rod end cylinder with a slightly larger bore. There are others ways, such as using a flow combiner, but they would require redesigning the circuit.
very helpful videos, but i have challenges controlling the swing speed of an FFLB crane, i notice that there are variable voltage soleniods that also control speeds of hydraulic flow and cylinder movements. pls have you come across such solenoids??
My question is more about rotary actuator speed control not so much as linear. Quick question....most people discuss hydraulic motor RPM off the reference to an electric motor driven pump. I understand that hydraulic motor speed is established off volumetric flow. Since most pumps are driven off AC motors they tend to have a set RPM which in turn produces a set GPM output flow. This in turn results in the hydraulic motor having a set RPM if not controlled by some form of restriction valves. However, in the case of a gasoline or diesel power engine driving the hydraulic pump....don't we gain greater control over the RPM of the hydraulic motor, by controlling the engine RPM since that should change the GPM of the attached hydraulic pump?? I guess what I'm asking is if we slow down or speed up the RPM of the pump we would essentially be decreasing or increasing the supplied GPM at the motor and effect the speed.....correct??
Directional control valves are usually proportional, which means you can control the speed pretty well by the lever. In this case you definitely don't need any restriction valve that unnecessarily increases the pressure, that in turn heats up the oil, wastes energy and causes wear to the pump. And the answer to your question is Yes. - But by using a combustion engine you can't control the hydraulic motor from zero speed without a control valve.
APT Specialist Hydraulics and Training is there a way of changing the rate of flow with out changing the the size of the pump or the motor that drives it. Or would you just have to change both to increase the speed of the cylinder?
if the flow control valve cum check valve piston side flow control valve rod side.how i increase the forwerd and reverse speed of the cylinder if pump not change.
Hi Gurdeep, we want to help you and answer your question. We are doing a Live Q&A tomorrow at 7:30am, join us live there and we might answer this question for you: facebook.com/events/176497570992728/
Gary Hall yeah, the temperature increases because you are wasting energy. All the energy that is not used to perform work, will be transfomed into heat. It is way better to design a system where you do not need a flow regulator. If you need to, it is quite possible que you will have to install a heat exchanger
@@garyhall867 Yes when you tell the smart hydraulic oil to slam into the dumb hydraulic oil it creates friction which in turns raises the working temperature in the containment vessel..
Very well explained . Ive experienced this very thing .
On a 20 tonne Cat excavator we had a thumb installed and used a old Hitachi boom lift ram off a 10 tonne Hitachi . The Hydraulic hose guy we got to plumb it up only used 3/8 hose and a 3/8 cross line relief valve .
The bucket hoses on the Cat were 3/4 . When grabbing a lot of trees and rubbish the cylinder shattered in half. We replaced it and it did it again about a week later . We got and expert hydraulic man to take a look and he replaced everything with 1/2 inch and the problem went away . The oil just could not return fast enough through the 3/8 system . The danger of using people that know enough to be dangerous and a costly lesson . The technician that fix it said that it could have cause a spike as much as 20000 psi inside the cylinder . Just completely chopped it in half
I was looking to learn about hydraulics for a dyi - thank you! Your clips are amazing. You're a good teacher.
You are doing a great job! Super clear explanations.
You are a remarkable and effective instructor. Thank you!
This is the coolest thing I've found. Great work on the videos. Cheers.
This video is incredibly informative! Thank you for making it!
Thanks... It helps me a lot...i'm studied electrical but now works in mechanical and starts hydraulic...
Very informative and quite interesting. From your demonstration, it's easy to see how you could generate too much pressure in a hydraulic cylinder especially when it bottoms-out. A very dangerous situation. Thank you.👍🏽🤠 4/10/23
Great explanation! Very easy to understand this. Since there is less surface area of the side with the restrictor due to the piston rod, that side will build a higher fluid pressure to balance the push against both sides of the piston. However, I think that the less the restriction of flow, there is more relief to reduce the higher pressure differential.
I find that there are one-way flow restrictors to eliminate need to a directional bypass.
I had to subscribe.
Great presentation, very clear and accurate. 🇬🇧
very good information and presentation. well explained thank you and keep them coming
Thank you for the good simplified information. I liked you accent.
thanks sir, a very good idea.. we exploded one cylinder twice by giving more pressure in extraction and now only i came to knew why.. nice job. upload more videos.
This is really an awesome video.Its going to help in my designs.Thanks for the great work
Very good, I've learned a lot. Thank You.
Great video!! We love hydraulic repair down in Alabama.
Great explanation. Very clear. thank you.
Very good demonstration. Thank you 🙂
Excellent illustration
Excellent video and explanation thank you🤘
Bravo.Clean and crystal clear 🤝
It would be a great help if you teach us how to manufacture a Double acting cylinder. With circuit Diagrams,Design & material selection.
That was super easy to understand. Thank you
Very good video. clear and easily understood.
One word, actually three - Very Good Teacher
Awesome job!
This is awesome, thank you very much
Very helpful. Thank you so much!
Heartfelt thanks for unselfish sharing your knowledge Sir!
Very clear and informative.
Amazing well explained
Good teacher.... Give us more
Good training for learning stage peoples thank you very much
Great! Thanks allot for that video
thank you very much for your video
I want to build a hydraulic system and I need t work out what size pump to use...I got a 6 horse power Kubota diesel...that is the starting point...I am building a log splitter maby one 30 ton cylinder ....do you have a video to explain
Very good videos, have you changed your page as I notice you haven't posted any videos in a while?
Also is this pressure increase ever used on purpose?
Nice explanation. Great safety glasses.
Hi , by changing a bucket hydraulic cylinder ,do 8 have to bleed lines. I used my tractor to blow wet snow an things worked for about 5 hrs, then lost pto lift an bucket lift. Any thoughts on what I should look at to trouble shoot an fix. Thanks R9b
thank you, very good video
super dear lot "love" from Jammu(india)
Maximum stroke per minute
of hydraulic double acting cylinder.??
Hi, is it possible to use a Hydraulic cylinder as an oscillator at 150Hz?
thank you bro for your explain ❤
អគុណបងthank
There actually is one very good reason to use a meter out flow control valve. If you have an overhung load on the cylinder (the load can pull or push the rod), with meter in, the load can produce a vacuum within the cylinder and travel unexpectedly. With meter out, it will be fluid locked and can not be pushed or pulled by the load. Much safer. Just use components capable of handling the pressure.
How is the pump relieving pressure when the hand valve is in the neutral position? Is it going through the hand valve back into the tank, the red line?
Thx this was insightful….wonderful explanation
Is there a way pressure intensification can be put into good use?
In this configuration, what kind of distributor valve are you using ?. Thank you
you are awesome
Thank You very much sir !
Is the control valve you are using a TANDEM CENTER control valve?
Is there a way to reroute your ram end pressure line with a relief valve on return to valve bank that would push that oil straight back into the base end of the cylinder for a faster extending of the ram ?? Kinda like an ER system
GREAT CONTENT !! BLESSINGS!!!
An excellent instruction video. I do detect a NZ accent.
thank you thank you
Very good teacher
Hi Im looking to alter a hydrauic function on my mini digger and wondered if you would possibly help reading a hydraulic schematic for my machine?
what do I need for a 2 ton ram please
U r great....😎
Awesome!
Really goog but what's about rod end and head end instead of back side and front side of cylinder....does it make sense ? Just wondering.
These videos are great!
Sir how to solve automatic level for genie boom lift problem can you teach
ive watched this a few times, i understand your correct way of limiting the speed to the back of the cylender, but you only showed the 'wrong' way to attach the flow control valve to the top end. IS the correct way just the other way around? (if i want to limit the retraction speed - to make them the same) i'm hoping to make my own little excavator. many thanks for these videos they are so great and helpful cheers from the UK o/
How fast can you make one go
What if there is no valve, like machinery have? What if it was a hydraulic system in an animatronic?
Can I see which type of lift you made which is your behind
nicely explained
Well said!
非常好
Very interesting
well done
Thanks for your help! hydraulic-master
Thanks a lot.
I am working on a project. Can you help me.
Great video!
Especially that you used actual components rather than teaching via a drawing on the white board.
Wonderful wo
Dear sir,
Firstly if we close rod end of this piston then we put pr in a confined hydraulic so how pr is increases?
Also as the system pr is same for area difference of the piston head end & rod end force is different but pr should be same.
I still not understand how pr increases? Plz explain anyone.
Good knowledge
love it
Man your good
so meter out is not the way to go, it will increase the pressure, build up heat which is not good for the system i suppose, correct me if i am wrong, thanks.
Is there a flow control valve to regulate even flow to 4 cylinders at once? I'm trying to make/operate 2 scissor lifts simultaneously to lift the rear of a truck up 20" to dock height. So 1 scissorlift on each rear corner of the truck and 2 cylinders on each scissorlift. They'd be driven off a drive powered by a 12vdc battery. I'm not far into planning this yet so.....
Hi David, there are methods such as using flow divides or phasing cylinders that allow for almost even extension speed of cylinders. For the application you described however it sounds like you will need some electrical control/monitoring and would best off consulting an expert for assistance.
Ok, got a question. My backhoe stabilizer legs are WAYYYY too fast retracting and dangerous. How can I slow them down ?
i have same problem with my digger arm working to fast .i was hoping to see some sort of method to slow hydraulic speed down
One question i have an electric dual hydraulic pump but need to use on a single cylinder can i still manage to use the dual hose electric pump with that single cylinder? Is there a y adapter that can make that possible?
Hi there, we are doing a live Q&A tomorrow at 7:30am (NSW) - join us live and we might answer this question for you. Join us here: facebook.com/events/176497570992728/
I have a small trailer that has a hydrolic hand jack to raise turn lever and it goes down I am changing to a hydraulic cylinder with hoses to run back to valves on my sub compact tractor. What kind of cylinder do I look for to raise and lower bed ? Wagon capacity is 2000 lbs
Hi Roy, we would like to help you with your questions - we gathered questions, like this, for our live Q&A tomorrow. Join us there and we might answer this question for you: facebook.com/events/176497570992728/
at the end, he placed the control valve and check valve in series, but the circuit on the board shows they are in parallel. or I'm wrong somewhere?
I noticed the same thing. If he installed the valve like he had it on the board I thought it would have stopped the flow creating the 150 bar without him needing to close the valve..
nice
I think you say preassure unit is bar while it is psi. Could you confirm please?
100 bar is 1450.38psi
Cool! Ok so how do you maximize the speed in both directions (and have them at least the same) to get the fastest cycle times? Also, what effect does speeding up the cycle have on the max force that a cylinder can generate?
To maximize the speed in the extension direction you would have to adjust the circuit to make it a regenerative Circuit. Regenerative Circuits increase the extension speed of a double acting cylinder by taking return oil from the rod end and use it in the piston end to speed up extension. but in a regenerative circuit reduced cylinder force is a major disadvantage.
@@CustomHydraulics I don't know of any way to "adjust" a basic circuit into a regenerative circuit. You'd have to redesign it. Besides, a regen circuit is most effective only when the piston diameter to rod diameter ratio is greater than 2:1.
The simplest way to achieve equal force for extension and retraction is a to use a double rod end cylinder-and it may not require redesigning the circuit. To achieve the same extension force as with the single rod end cylinder, you'd have to use a double rod end cylinder with a slightly larger bore.
There are others ways, such as using a flow combiner, but they would require redesigning the circuit.
very helpful videos, but i have challenges controlling the swing speed of an FFLB crane, i notice that there are variable voltage soleniods that also control speeds of hydraulic flow and cylinder movements. pls have you come across such solenoids??
Look up PWM….
My question is more about rotary actuator speed control not so much as linear.
Quick question....most people discuss hydraulic motor RPM off the reference to an electric motor driven pump. I understand that hydraulic motor speed is established off volumetric flow. Since most pumps are driven off AC motors they tend to have a set RPM which in turn produces a set GPM output flow. This in turn results in the hydraulic motor having a set RPM if not controlled by some form of restriction valves.
However, in the case of a gasoline or diesel power engine driving the hydraulic pump....don't we gain greater control over the RPM of the hydraulic motor, by controlling the engine RPM since that should change the GPM of the attached hydraulic pump??
I guess what I'm asking is if we slow down or speed up the RPM of the pump we would essentially be decreasing or increasing the supplied GPM at the motor and effect the speed.....correct??
Directional control valves are usually proportional, which means you can control the speed pretty well by the lever. In this case you definitely don't need any restriction valve that unnecessarily increases the pressure, that in turn heats up the oil, wastes energy and causes wear to the pump.
And the answer to your question is Yes. - But by using a combustion engine you can't control the hydraulic motor from zero speed without a control valve.
Thank you for these lessons, but what is the point to make videos and not answering to the questions ?
How would you speed up overall operation without changing the pressure of the system?
Hi Fred, pressure in a circuit effect the force of actuators, if you want to change speed, you need to change the flow in the system.
APT Specialist Hydraulics and Training is there a way of changing the rate of flow with out changing the the size of the pump or the motor that drives it. Or would you just have to change both to increase the speed of the cylinder?
if the flow control valve cum check valve piston side flow control valve rod side.how i increase the forwerd and reverse speed of the cylinder if pump not change.
Hi Gurdeep, we want to help you and answer your question. We are doing a Live Q&A tomorrow at 7:30am, join us live there and we might answer this question for you: facebook.com/events/176497570992728/
way of your teaching is good, the another person on this channel is bit difficult to understand due to acsent
why not increase surface area on the other side by reshaping the back of the piston in an angle increasing its area
It’s not the piston area but the fluid volume that causes the pressure difference
when you restrict the follow of oil does that cause the oil to rise in Temperature. ??
Gary Hall yeah, the temperature increases because you are wasting energy. All the energy that is not used to perform work, will be transfomed into heat. It is way better to design a system where you do not need a flow regulator. If you need to, it is quite possible que you will have to install a heat exchanger
Do you know what your talking about ???????????????????????
@@garyhall867 Yes he does exactly. Consider the possibility that it is you who can't follow.
@@garyhall867 Yes when you tell the smart hydraulic oil to slam into the dumb hydraulic oil it creates friction which in turns raises the working temperature in the containment vessel..
2:30 I was not prepared for this level of violence. A content warning may be necessary.
you had that metering valve hook up in series you hook up not like your drawing there not same