Adam, you are right on top of some very important and tender issues for a circuit like this. On this exact machine, the load mass is always the same, and the rate of motion is very slow. Therefor a counterbalance is not needed. There will not be a runaway, which is where a counterbalance valve shows it's capabilities. Of course a counterbalance is not a flow (speed) control per se. If you look closely at the symbol, you will see an extra inline arrowhead in each flow control (older ANSI symbol shows the extra arrow head at 90 degrees to the flow line). This denotes a pressure compensated flow control, which is the type with a small floating spool inside that can make minor adjustments to the orifice opening automatically if pressure fluctuates a little on one side or the other of the flow control. In so doing it keeps the flow rate very steady. I have oversimplified a little on the p. comp flow control explanation. We will do a video soon on the pressure compensated flow control as a component. In my experience, the p. comp. flow control can only provide 'compensated' flow control in one direction. Haven't seen one yet that can do both. So two flow controls are needed to provide truly pressure compensated flow, one for each direction. That's a second reason to use two FCs. Chad Jessup who commented earlier, picked up on the other. Thanks for commenting/playing along! - Carl
sir. i really thankful to you for your lessons. i have a request, may i watch a video on practical working of ' bent axis axial piston pump with power control.' please.
This is a new animation of an old machine actually. The trick of using both meter-in and meter-out together, is not new. Sometimes it causes confusion for the technician who has to adjust the flow controls.
I just found this channel and instantly subbed. These are great, simple and easy on the eyes. Thanks.
Our team really appreciated your kind remarks. Thank you.
Looks great for syncing cylinder movement.
look i tell you what , you guys are kickass clevver.
Please simplify the reason for using meter in and meter out flow control valve in the same line in series
A truly great channel is enlightening the industrial world.
One may want to vary the difference between extend time and retraction time.
Yes that is one of the reasons to use the two flow controls. Quite right!
LunchBox Sessions what else reasons??
sir,i want video of ,in the system how it is working accumulator brifly
So ideally would it be lifting and lowering the heavy loads with modulated speed and does away with the need of a counterbalance valve?
so in otherwords by using a single needle valve in the full bore would not support a run away load where as the current system does.
Adam, you are right on top of some very important and tender issues for a circuit like this. On this exact machine, the load mass is always the same, and the rate of motion is very slow. Therefor a counterbalance is not needed. There will not be a runaway, which is where a counterbalance valve shows it's capabilities. Of course a counterbalance is not a flow (speed) control per se.
If you look closely at the symbol, you will see an extra inline arrowhead in each flow control (older ANSI symbol shows the extra arrow head at 90 degrees to the flow line). This denotes a pressure compensated flow control, which is the type with a small floating spool inside that can make minor adjustments to the orifice opening automatically if pressure fluctuates a little on one side or the other of the flow control. In so doing it keeps the flow rate very steady. I have oversimplified a little on the p. comp flow control explanation. We will do a video soon on the pressure compensated flow control as a component.
In my experience, the p. comp. flow control can only provide 'compensated' flow control in one direction. Haven't seen one yet that can do both. So two flow controls are needed to provide truly pressure compensated flow, one for each direction. That's a second reason to use two FCs. Chad Jessup who commented earlier, picked up on the other.
Thanks for commenting/playing along! - Carl
+LunchBox Sessions I enjoy the teachings so thanks for making them.
Thanks
sir. i really thankful to you for your lessons. i have a request, may i watch a video on practical working of ' bent axis axial piston pump with power control.' please.
Is it new machine?!
This is a new animation of an old machine actually. The trick of using both meter-in and meter-out together, is not new. Sometimes it causes confusion for the technician who has to adjust the flow controls.
Good