Flow Control Methods (Meter In, Meter Out, Bypass)

[@bigbadtech]

Ankush, yes, I'm using MS OneNote for the lectures. I use Camtasia screen capture software. Glad you're making use of these videos. Stay in touch because I'll be slowly updating the hydraulics and electrical control of hydraulic systems playlist. My plan is to improve the audio and editing of the old ones I have at the cgcclive channel and include a bunch more advanced applications and illustrated example problems.

[@bardia8225]

I love you for these videos man

[@timrudloff6478]

17:23 I dont understand why the pressure is rising on the upstream valve. Can someone help me here?

[@wpog8453]

Awesome. Do you have videos for meter in meter out flow control on variable piston pump systems?

[@bigbadtech]

Not in any detail. This lecture includes a brief mention: kzbin.info/www/bejne/inPbfpp9ppiCb5Y

[@wpog8453]

@@bigbadtech thank you. do you know if anywhere I could find resources on that subject?

[@kozstandsya1494]

Doesn't a restricted orifice also reduce pressure? Would meter in flow restrictions be giving the cylinder a weaker "push" than a meter our?

[@mcpel262]

Hi Sir, I would like to ask if it is ideal to install dual FCV in opposite direction in one line? to do both meter in and out function. Thank you

[@bigbadtech]

Yes that’d work however be twice as expensive.

[@mcpel262]

@@bigbadtech Thanks for the reply Sir. Could you give me an idea on how to do a simple design on bi-directional hydraulic motor braking circuit? We have a hose-reel hydraulic system in place that is poorly designed and needs a modification as the DCV doesn't have a detent feature in it for reel braking purposes. The hose that is wound onto the reel rolls out continuously even after taking out the desired length. The existing design has a 3 position DCV Open Center, Spring-Centered. There are no relief valves on the lines connected to the motor. A detent-type DCV would do but it'll costly. Considering the present design what could you suggest in achieving an effective reel braking feature? Thank you so much in advance.

[@bigbadtech]

Check out the cross over pressure relief valve at: kzbin.info/www/bejne/sIi1d5yYpZuKpLc

[@mcpel262]

@@bigbadtech Considering the present design, how can we modify it for effective braking?

[@johnc4352]

Jim, Most hydraulic excavators have the lift cylinder mounted to the body of the machine and the rod attached up on the boom arm. I have noticed on some very large machines, the manufacturer has mounted them upside down with the rod attached to the body and the cylinder attached to the boom. What would be the reason for doing this, there are many factors involved other than just basic hydraulics such as possible damage to rod chrome, or oil leaks in sensitive areas. Thanks for your time and effort in your series.

[@bigbadtech]

John C Good question and good observation ... my background is in industrial wind power so I'm only wildly guessing here but it might be because of mobile applications that preferentially lift a load and then dump it (ie: front loader dumping into the back of dumping truck) versus an application that both lifts and lowers a weight (ex: a crane) or it may simply be manufacturer preference or range of articulation for a pivoting mount. Once we get to "Pressure Control" valves I'll talk about something called a "Counter Balance Valve" that also controls the descent of a lifted object. It's kind of like a normally closed valve (with check valve bypass) that only opens once pressure exceeds a certain value. This way the lowered object (similar to a meter out extension) has some pressure supporting it on descent.

[@ankushm3t]

Can you tell me which software application you're using to draw diagrams? OneNote?

[@tejasmahadev5135]

Great video Jim! Just wanted to say that choose different thumbnails for your videos. That would really help people find out what your video actually contains. I myself neglected your videos before landing on this video! So.. Just suggesting

[@ankushm3t]

Thank you :)