How To Read Valve Section Schematics

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Our previous video looked at the hydraulic power unit (HPU) schematic section, and in this video we'll move up to the valve section. We'll look at the main directional valve, a pressure reducing valve, two relief valves, and more. Once you know what these valves look like, and what they do, you should explore the related videos on Directional Control Valves and Valve Solenoids. You'll be much better prepared the next time you need to troubleshoot the valves in your system.

[@samirmondal4301]

Very very good Hydraulics Video. Thank you Sir.

[@manjeeeeet]

Great video!

[@nenaddragovic2987]

Fantastic!!!

[@workwillfreeyou]

Anti-cavitation check valve spring pressure would be low? 7 psi? Great job with all videos.

[@karemfouda7392]

very gooooooooooooooood

[@cck0728]

Excellent video. What causes the oil to flow through the anticavitation /make up valve from the tank? Is it due to venturi effect (due to more flow while lowering)? Thanks for your time.

[@lunchboxsessions]

Anticavitation flow from the tank occurs due to a pressure differential of higher pressure (atmosphere pushing down on top of tank fluid) to lower pressure (partial vacuum pressure in a cylinder that is moving due to external forces, and thereby attempting to draw in fluid ). Does that help a little? Feel free to reply again. - Carl

[@genarocastellon8030]

So a vacuum is created during extension and retraction? Thanks if you can still reply.

[@MyYure]

@@genarocastellon8030 some degree of vacuum, yes.

[@joehunt3512]

Millwright approved

[@kamparajuravishankar3254]

explanation is excellent but the working photage symbols not visible

[@abdullahzaki8688]

What is application for edit the line?

[@mandipthapa8289]

where's part 4 of this series ??

[@najinkunnath6009]

What does the dotted line in relief valve symbol represent ?

[@rhythmandacoustics]

pressure line to actuate the valve

[@jrabot2035]

Hello sir can ask you something this is my problem my excavator when cylinder full extent my engine is die pls help me sir thank you so much

[@mikemeyer2155]

Yeah you're dead heading your pump and overworking your engine so if your engine isn't in the best shape, it can't handle the stress. Just a guess

[@user-ow9hp7lz9f]

Dear Sirs, Accidentally delete the last scheme sent (How To Read Cylinder Section Schematics), you could help me so that I can see it again, I would greatly appreciate it.

[@lunchboxsessions]

There was a mistake in that video, so we deleted it and re-uploaded. You can find the new video here: kzbin.info/www/bejne/pmPLo5Rqh5WSgas

[@user-ow9hp7lz9f]

thanks, regards

[@andyatmosphere]

PLEASE ZOOM in on given topic

[@deadman1462]

Left section pilot is not connected to tank?

[@lunchboxsessions]

Thanks for writing. Both left and right pilot drains are usually tied together as one drain within a larger detailed symbol. But as mentioned in the video, the symbol for the solenoid controlled, pilot operated valve was drawn simplified. In addition, this original drawing that we animated, was from about 40 years ago. But sometimes in maintenance work, one is forced to work with older drawings that did not follow the standards we have today. The ISO 1219-1 2012 standard is certainly a better hydraulic symbol and schematic drawing standard than what was followed on this original drawing. Thanks again for writing. To learn more about that type of DCV, see our video kzbin.info/www/bejne/j5PKf42VZZ50eLM

[@26Jaki]

what machine is it, and can you show it in really! the video is extra!