Hydraulic Steering: The Orbitrol / HMU Valve
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- čas přidán 10. 09. 2024
- Take a look at the hand metering unit valve, also known as an orbitrol valve. It's a type of servo valve that quickly closes off its own flow after sending out the correct volume of fluid to the steering cylinders. This "correct volume" is based on the operator's need for a sharper or more gradual turning radius, as you'll see in the video. We'll have more info about this system in our upcoming videos, so stay tuned and enjoy!
Buy the explorable systems and lessons on our website: www.lunchboxse.... They are -by far- the most affordably-priced, most professional learning material in the industry. And besides, more content you buy on our site, the longer we'll keep making these videos. That's gotta be the best way to swell your brain with troubleshooting know-how, right? Right!
If there's a hydraulic or electrical topic you'd like to see us cover in a future video, leave a comment. As always, thanks for watching!
Sr. This is a very valuable gift and support for us, you are a master. Tx.
In the Alberta Apprenticeship books, they show an HMU from a CAT scraper with just 3 hoses hooked up and the bottom left port plugged. All the 3 hoses could be a 3/4 ID and run from the HMU under the cab floor through the frame. The top left port has a sort of nipple. I have no idea why it's set up like that. The bad thing is that I'm studying on my own for Red Seal and don't know anybody with that king of expertise... Anyway great videos on this channel !!!
So basically they are a combination of a precision metered flow control valve and a hydraulic (pump/motor).
From my understanding there is two types of Orbitrol valves. Non-Load Reaction and Load Reaction. If I have a machine with a Load Reaction Orbitrol, could I mount a double acting pilot operated check-valve to the cylinders to make it Non-Load Reaction? Or would this make the steering jerky and hazardous as I first have to overcome the check-valve for every steering movement?
Which software did you use for this simulation and designing
very goods videos they are helpfull to me in my job Thankyou and congratulations, my English is not so good : saludos desde jalisco.
Hi! What's the name of the software you use to make the hidraulic diagrams??
nice to clear the douts
Is there a any session that is available to talk about side load or side force on Hydraulic cylinder.. best method test and validate of Hydraulic cylinder buckling load.
can we use this schematic on a orbit assembly EATON design model no XCEL45. for test this assembly prectically
Thanks
sir your videos are very helpful.
can you make a video about how to give job interview for hydraulic technician etc.
Thank you.
Very fine videos, however you are so fast for a trainee like and studying it whilst in industry.
Hey im still not sure how it works. Why do the the lines move with the valve? Why are the the ports blocked off? Whats that one dotted line do? Whats that symbol mean on the lower left of the spool? And it looks like theres flow control valves on the spool itself, what is this and how does it work?
It also looks like when turning left or right both ports of the gerotor get pressurized, so how can there be movement there?
Absolutely beautiful animation though, really helps with the visual aspect
Think i got it.
1. The lines represent the outer sleeve that the spools rotates in.
2. Because its a closed center system
3. The dotted line is a return to rank line.
4. Not exactly sure, but im guessing it has to do with the mechanical linkage
5. Not sure on this either. Maybe its not variable but still a restriction?
6. With equal pressure on both sides of the rotor it cancels out and can be turned freely. It can also act as a emergency pump if the main pump goes down.
2 Hours well spent learning about these great valves
yes
Help? What do you call the "steering mechanism principle" (eg Ackermann, Bell-crank steering, etc.) used in this, that turns both wheels that pivots in the center of an (e.g. single solid) axle? Like, the old-style wagons....
Also, would there be a slip or skidding when driving at high speed? Would really appreciate your help...
Articulated steering
Bit of a hydraulics neophyte, but only question i have is what component is the steering wheel driving?
At 1:51 you mention it's connected to a shaft attached to the valve. Is this is connected the valve spool opposite the physical connection the Gerotor is adjusting mechanically? I'm guessing that input is the small rectangle symbol on the right side of the spool (2 arrowheads pointing into circle)? Is this a simply mechanical connection to the valve spool?
Hey there @hockeyrink. Thanks for the question. The steering wheel via shaft, is connected to the orbitrol or HMU. The HMU is everything that you see in the rectangle/assembly outlined by the dashed lines. The exact point of steering wheel/shaft connection is not as clearly marked on this schematic as it is some others. Some manufacturers show a shaft symbol (dbl parallel lines, same symbol as for mech linkage) coming into the valve spool, and some show the shaft first entering into the gerotor circle part of the symbol.
Have a look at this image. www.carldyke.com/wordpress/wp-content/uploads/laptopAccumulators.png?9e2701 Do you see the shaft stub sticking out of the gerotor circle at the 9:00 position? I hope that helps answer your question. We're working on new steering lessons on LunchBoxSessions.com and some 3D videos that will help with this topic. Thanks again for the question.
There's also this image of ours where you will see the shaft (left side) from steering wheel, entering the HMU.
www.carldyke.com/wordpress/wp-content/uploads/orbitrol.jpg?9e2701
what is the software that you use
I dont think this explanation is as good as the other excellent videos. I do not see how anyone can fully understand this simulation without prior knowledge.
Yeah this confused the hell out of me at first because of all the technical mumbo jumbo. I then watched a video from AvE about it and understood it way better and when I came back to this video I had already learned what this video teached. So basically to understand this video you have to know the technical lingo and if you know the technical lingo chance is you already understand what this device does. Not very good vid for showing this off to newcomers or homegamers
Then again this is just an ad for their software and not actually meant for teaching people
hello , I have a question.
The force on cap end cylinder be more than force on rod end cylinder , assuming equal pressure.
Does it cause any problem in steering ? how do they resolve it?
In an articulating machine as shown, the steering force is always the sum of one cylinder pushing and one pulling because of the criss-crossed hoses
Which software do you use for your simulation? It's awesome
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I was stupid forgot the login password. I would appreciate any assistance you can give me!
@Turner Kane Instablaster ;)
@Nicolas Torin I really appreciate your reply. I found the site on google and I'm trying it out atm.
Takes quite some time so I will reply here later when my account password hopefully is recovered.
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@Turner Kane no problem :D
Dear sir I want to know hydropneumatic cylinder functions
Would u mind to translate it videos in Bahasa Indonesia 🙏
So how does this system make up for the fact that cylinders retract faster than the extend?
think just due to mechanical coupling, the flow will just go accordingly to rod and cap ends of opposing cylinders- pressure in a common line will automatically equalize even with flow differences from rod displacement... if they werent mechanically tied though, yeah, speed would vary
I am the manufacturer of orbitrol valve and my brand is HANJIU
thanks. You can translate to arabica
what is this software name ?
l want knot to this software name.
you can hear the Canadian in his voice