ฝัง
- เผยแพร่เมื่อ 21 ก.ย. 2015
- PRESSURE LIMITING COMPENSATOR / LOAD SENSING PUMP CONTROL FOR REXROTH AXIAL PISTON HYDRAULIC PUMP
I 'll do another vid soon showing why pump standby pressure is often higher than the L/S spring value (300 in this scenario)
This video is for educational purposes only. Consult machinery service literature for specs and procedures to safely make any adjustments or repairs on any machine. Values and operational info here is only typical. Designs, applications and specifications vary from machine to machine.
#hydraulicsystems
#hydraulic
#excavator
#fluidpower
#mobilehydraulics
#heavyequipment
#redseal
#loadsensing
#hydraulics - ยานยนต์และพาหนะ
this is one of the best videos I have ever seen explaining the function of the load sensing. thanks for this great add.
Best spent 10 minutes and 47 seconds on TH-cam ever. So much information in a simple way.. Not sure how many times I have gone back to this and your other films to learn and refresh my memory.
Very well done , thanks for making these very informative videos for all us trying to get a good understanding of our machines hyd systems. Between you and lunch box sessions I've got a pretty good understanding of the closed center load sensing. I've got a excavator that uses a open center negative control system and would be very interested in seeing a demonstration on how that type of pump control functions. Thanks a lot for these great videos!
Excellent explanation.
Thanks alot! Very well explained, finally i understand how it works
That was an amazing video mate. Very well done.
The best way of teaching sir .. I never watched video such type.. you made wonderful tech video sir . Thank you so much
Many many thanks for the explanation in depth.
Thanks for educational background for learning
Great video, thanks!
The coloured explaination made things more clear. Thank you
Thank so much you sir. Just trying to figure out the load sensing and pressure controller interaction with the swash plate from the Rexroth or ROV manual was a pain. 10minutes spent with you and it was obvious! Much appreciated👍
Please like and subscribe.. it will help motivate me to make more vids
Hydraulic pressure composerted flow control valve very good Video. Thank you sir.
Thank you for this ❤️
Loving it! best explanation I have ever seen
I can fix problem with your explanation, thanks a lot sir
Good explanation. Stroking and destroking. Couple of comments: 1. Pump discharge port not mostly go to close center valve since most load sensing valving system use "float center" type or any valving system having "closed P" port but with outputs A/B goes to load sensing port thru shuttle valves. 2. Technically the load sensing line can't have a "zero" pressure since height of the column of oil or trapped oil pressure could still exert force against P pilot lines. I'm pointing some emphasis on 2 because you might create a "void" in the load sensing line if the piping system is not proper and could create some erratic functioning of the system especially at starting. There might be applications where the valving system is higher than the reservoir which might not ensure to complete filled pilot or drain lines. Good job btw.
+PC Gamer_Bowler yep and sometimes the DCV doesn't actually send the signal at all... in some systems the pump regulator actually sends oil OUT the X port, and the DCV signal network controls and "matches" it to the workport pressure. (Many steering systems on heavy equipment do it that way to minimize oil loss from the DCV). Other systems use signal duplicating valves (some Large Cat excavators) . There are lots of variations out there for sure. Thanks for watching!!!.
Very nice example
je suis francophone mais merci de votre explication
well done thanks
nice! waiting for the other videos!
Nice explanation on Load Sensing...do you know have any video simulation of the Rexroth with said load sensing....or maybe you know of some youtube showing this...please add a link as well.
thanks sir
Thanks!
very good explanation cheers!
actual valve is from rexroth and hydrulic schematic from vickers
Yes, we use the Eaton textbook
thank u
thank you 👍
thank you. interested in what happens when work is being done on the output side of DCV? How is swashplate angle maintained during work output?
thank you for the educational video
thank you. I've been reading and reading. my teacher should just show show the class this video
+k20town feel free to send your teacher the link
Thanks a lot buddy it is really helpful.
Great video, clear explain. Thank you so much.
Thank you very much.How to control case drain?
Excellent instruction Thanks
thanks sir. good explanation
Hi
We have a variable displacement piston pump.... It is not giving pressure... Load sensor checked and found OK.. Still the same problem occurs... Pls guide me how to resolve this issue...
I have one the cycles on and off moving
swash plate as motor runs. Set at 300psi and 3000psi. If i lower to 1500psi cycling stops. Internal leak or broken spring? Oil gets very hot. Forks on forklift will tilt down un intentionally if I set at 3000psi. Execellent video Thanks.
I was using 300 and 3000 as typical examples. Follow factory service literature for proper specs. and adjustment processes for your machine.
We have a issue with rexroth pump 3000 psi which is frequently replace new pump but pump not working in neutral position will you advise what is the problem
Thank you so much for sharing this knowledge.
Good 👍👍👍👍👍👍
Thank you for your videos
I'm really excited to see more.
Please,could you help me out maje a preventive maintenance schedule for hydraulic system
Küçük olan ayar LS hattı 25 ila 30 bar a ayarla , büyük olan ayarda çalışma basıncı bu kadardiki zaten , ama siz hidrolik bilmiyorsanız fazla karıştırmayın Hidrolik çi hatasını toprak örter 😊
Nice explanation did u make a part 2?
Witch one Valve can give me co trol HP and flow ? Manual or 12v ..i have a10vso28
Nice video my boss.so Which one to adjust first.load sendsing or cmpnsator...?
So L.S. pressure doesn't stroke your pump but prevents it from destroking by blocking the oil to the destroke piston until the pressure setting of the pump cut off is achieved?
ஒரு டைம் தமிழ்ல டீட்டெயில் சொல்லுங்க சார்
Good point on getting the diesel engine started...
Very good video. What is the purpose of the "small hole" on the pressure compensator spool? Is the spool hollow inside? Can anyone clarify please?
Thanks.
Its hollow to the bottom . That's how oil gets under the end of the spool.
@@hydraulics Thanks for your excellent work....I think, there would be an exit hole (metering hole) too in the same spool, so that oil can come out?
Thanks for your excellent explanation.
Hi. I have a pump like this. The label says DFR but there is no load sense line. Its set up as a DR sense system. Im not sure im under standing the function of the DR system. Bare with me..lol Im working on a telehandler. It has a open center spool valve with hydraulic pilot controls. System pressure is suppose to be around 3100psi. SO to set the DFR pump up in DR mode, According to rexroth, you screw the load sense control all the way which blocks the sense ports to the pump. Now you set your system pressure buy screwing in or out the pump pressure setting. (3100psi constant pressure) SO my question is ..am i understanding this correctly . With a open center system with no load sense line (DR), the pump is always putting out 3100psi If thats the setting pressure, and when you activate a function the main system pressure drops which is sensed through the pressure limiting compensator port going to the de stroke piston. So when system pressure drops on command the swash plate de stroke piston spring pushes the swash plate to stroke direction to maintain system pressure of 3100 psi.
Am i getting it?
I'll make a bunch of assumptions here as i don't know your machine's system detail, but yeah, if the valve is open center, then your pump would be putting out full flow in an attempt to get to 3100 psi. But being open center, all the flow will be going to tank with controls in neutral or hold and pressure will just be line, cooler and filter back pressure- you might see a few hundred psi at high engine speed - or less if no filter. . When you actuate a control, the pressure will then be load induced (weight on telehandler boom for e.g.). When you bottom a cylinder, then the pump will max out at 3100 and destroke. Your machine may also have a main relief though.
After 5 years i fond it
Thinks master
Thank you for your beautiful presentation. present an lpvd demonstration of poses
greattttttttttttttttttttttt
Please make more AC videos like your "Neutral wire explained". Eg. "How to work with capacitors on single phase"
thank you
Very good videos but I would like to see a video with the explanation on the bearings and adjustments of them also the sealing what type of sealing use in this type of pumps thanks
Nice video to explain load sence and about compensator valve, but which case we need to adjust both valve,
this view is only for use veriable displesments axile piston pump thans yous giuedness
I might be wrong, but the drawing on the pump side is a bit confusing tho. The destroke action of the pump contradicts the direction of arrow (angle), and this seems confusing to me.
Yeah it's the drawing in the Eaton textbook so I didn't want to redraw it but the swashplate seems backwards doesn't it...
Is it possible to (dead head) this pump to for testing?
In most configurations, yes. My exposure is on the mobile side, so I just follow the service manual, but if the DCV is closed center it's output is blocked. Some machines do open some sort of unloading type spool though to allow some flow.
Hello sir, Myself Ajit Nayak from INDIA, I have Rexroth A10VSO100-DFLR-31R pump. before few days my team replace rotary kit in this pump. i request to you pl. guide me to set up Pressure, Flow control as well as load sensing valve optimum setting.
my CNC machine required pre. is 3200 PSI, 50HP Motor using in this system. Thanks.
Is ths up stroke and destroke in opposite direction.when the arrow comes near vertical it is minimum displacement.
yeah, it seems backwards to me too-.... I was using the schematic from the Eaton fluid power textbook- I have since switched it around for my classes, but didn't redo the video.
sir bring its second part
th-cam.com/video/Fb8o-9b4Mrc/w-d-xo.html
DRS CONTROL
Search by write : load signal hydraulic pum piston
what is DRF and DFR
It's the type of pressure control. It uses hydraulic flow control.
I don't know what it stands for.
Awesome explanation of controllers but swash angle explanation is totally opposite to the convention. Swash angle arrow away from the pressure outlet line is considered as pump in full displacement and the same arrow, in line (Vertical) with suction and pressure line on the schematic is destroked.
That's the schematic in the Eaton textbook. Seems backwards to me, but there's no official convention on which way the arrow moves for upstroking or destroking so I just went with what they provided.
@@hydraulics That’s OK. After all the time learning one way for 20+yrs, I thought of pointing it out. But Ur Controller explanation is flawless.
please hindi language.in speek
yeah, hang on a sec... lol
Thanks....
Can you send me subtitles for this video? I want to translate them into Russian for a better perception of information. For personal use. Thanks.