This really helped me understand the fundamentals of pilot control. Perfectly clarified all the points I’ve been trying to figure out! I enjoyed the narrators tone as well, confident and clear, felt like he actually cares about the content.
What I find odd, is the use of system pressure for pilot supply. In mobile hydraulics I am used to seeing a pressure reducing valve in the supply for consistent pilot supply pressure.
Simply a wonderful video. Very good explanation, cool animation. Slightly faster. Kindly give more time in between the explanations to digest the flow. Thanks again.
Would be cool to see a similar video, with "proportional" in front ;) That's what we use almost exclusevily. It's a relly cool concept of pre-reducing pressure to cca max 40-50 Bar, and then basicaly by controling the electrical force in the solenoid the output pressure of another precise pressure reducing valve is controlled (there are 2 of course, one per direction, but only one at the time is active). That pilot pressure is acting against the main spool providing a degree of spool opening, dependant on the pressure, which ultimately controls flow through it. Every serious manufacturer will provide you with current (or voltage/current in case of built-in amplifier) to pilot pressure to (percentage of maximum) flow.
Ah yes, perhaps the 3DREP over 4WRZ by Bosch Rexroth? We have that valve and we have a simulation too. But the artwork needs updating. We'll get to some proportionals before too long. Thanks for writing. - Carl
We actually never used Bosch Rexroth for that purpose, I have to admit that I didn't even know that they produce it. My absolute favorite is Parker CVG 30/50/60, we use it often in Ex zones, in combination with Thomas coils. We also use Brevini HPV 41 and Have valves quite often. We use this electrical controlled pressure reducing valve to control pilot pressure for controlling variable displacement pumps. Both components from Bosch Rexroth most commonly
sir,can you enlighten me that i saw some maker 's catalogue that we need about 4.5-8bar of back pressure at tank line in order to let this 2stage vlv work well .what do you think?
I have a doubt please clear it when we look in to the pilot section we can see 3 types of operation one is solenoid ,spring and other one is what please explain .
Thank you so much for this video. So the X port is only used if you want to have external control of the pilot. So this is optional. Is the Y optional too? Or does it have to be connected to the tank? I'm using a 4 port 2 position pilot controlled DCV. Thank you sooo much in advance. I'm a beginner experimenting on a Project.
I have a problem with retracting rod of the boom cylinder at a new miniexcavator. It's pilot operated spool. I checked everything but the spool itself and the components. When retracting rod into cylinder it is an obstruction as it doesn't let bottom oil from cylinder to go freely back in the return line/tank. After 100 hours , this problem laminated my hidraulic oil and really broke his molecaular structure and turn it brownish dark (Iso VG46) and heats above 80 degrees celsius. Is it posible that somehow the joystick pilot pressure isn't enough to push the spool proper into corect position and the return line is chocked? Maybe the spool spring too stiff? Any help apreciatted. Thanks.
I'm not sure but I think that is a port that might be used if another valve in series is needed. You can simply open the block in "x" and connnect to another P port at another valve. So in this case, with only one power unit you can control 2 solenoid-controlled pilot-operated directional control valve
thanks for nice explanation .. please give one session about internal and external pilots .. one doubt in this y all pilot valve are J spool y not other like H , G , etc..
Excellent video. What is the application of these type of valves? If I am not wrong, Steam turbine control valve? Kindly correct me if I am wrong. Thanks.
Thanks for the question. These valves are common for directional control of cylinders or hydraulic motors in any application where there will be a high rate of flow. We commonly find them on the chip truck or rail car dumpers at a pulp mill, or on the rail car dumping system at a ship loading terminal. That's just one or two examples.
These valves are used in Injection Cylinder of a 250 ton Rubber injection Molding presses for injecting the rubber into die. These valves are also called as slave valve. These valves are used when high requirement of flow is to be achieved.
This really helped me understand the fundamentals of pilot control. Perfectly clarified all the points I’ve been trying to figure out! I enjoyed the narrators tone as well, confident and clear, felt like he actually cares about the content.
Great video. Thanks for explaining the X and Y ports and how you can have an external supply for the pilot valve
Thanks! Good animation, clear voice, slow talking (sometimes) makes this very useful for understanding the basics!
Thanks a bunch man, I have an exam in 5 days and this helped me a lot to understand how pilot operated valve works :D
those videos are very good tools in understand how the hydraulic system really works.
nice job guys.
Guys, you are awesome! the best explaining videos I have ever seen!
Your vedio is big help to me being a technician practioner
This explains perfectly. Thank you!
What I find odd, is the use of system pressure for pilot supply. In mobile hydraulics I am used to seeing a pressure reducing valve in the supply for consistent pilot supply pressure.
Travail remarquable, bravo.
Your videos are very informative. Please keep up 👍
Simply a wonderful video. Very good explanation, cool animation. Slightly faster. Kindly give more time in between the explanations to digest the flow. Thanks again.
Would be cool to see a similar video, with "proportional" in front ;)
That's what we use almost exclusevily. It's a relly cool concept of pre-reducing pressure to cca max 40-50 Bar, and then basicaly by controling the electrical force in the solenoid the output pressure of another precise pressure reducing valve is controlled (there are 2 of course, one per direction, but only one at the time is active). That pilot pressure is acting against the main spool providing a degree of spool opening, dependant on the pressure, which ultimately controls flow through it. Every serious manufacturer will provide you with current (or voltage/current in case of built-in amplifier) to pilot pressure to (percentage of maximum) flow.
Ah yes, perhaps the 3DREP over 4WRZ by Bosch Rexroth? We have that valve and we have a simulation too. But the artwork needs updating. We'll get to some proportionals before too long. Thanks for writing. - Carl
We actually never used Bosch Rexroth for that purpose, I have to admit that I didn't even know that they produce it.
My absolute favorite is Parker CVG 30/50/60, we use it often in Ex zones, in combination with Thomas coils. We also use Brevini HPV 41 and Have valves quite often.
We use this electrical controlled pressure reducing valve to control pilot pressure for controlling variable displacement pumps. Both components from Bosch Rexroth most commonly
Thank you very much very detailed explanation.
sir,can you enlighten me that i saw some maker 's catalogue that we need about 4.5-8bar of back pressure at tank line in order to let this 2stage vlv work well .what do you think?
Can you make videos on Proportional Valves and Servo valves..
That would be very helpful to many of them
I have a doubt please clear it when we look in to the pilot section we can see 3 types of operation one is solenoid ,spring and other one is what please explain .
Thank you so much for this video. So the X port is only used if you want to have external control of the pilot. So this is optional. Is the Y optional too? Or does it have to be connected to the tank? I'm using a 4 port 2 position pilot controlled DCV. Thank you sooo much in advance. I'm a beginner experimenting on a Project.
Y port would be required for a float-center solenoid valve, as shown
I have a problem with retracting rod of the boom cylinder at a new miniexcavator. It's pilot operated spool. I checked everything but the spool itself and the components. When retracting rod into cylinder it is an obstruction as it doesn't let bottom oil from cylinder to go freely back in the return line/tank. After 100 hours , this problem laminated my hidraulic oil and really broke his molecaular structure and turn it brownish dark (Iso VG46) and heats above 80 degrees celsius. Is it posible that somehow the joystick pilot pressure isn't enough to push the spool proper into corect position and the return line is chocked? Maybe the spool spring too stiff? Any help apreciatted. Thanks.
Superb
Does port "X" act as an emergency vent to tank if pressure build up in the pilot section?
I'm not sure but I think that is a port that might be used if another valve in series is needed. You can simply open the block in "x" and connnect to another P port at another valve. So in this case, with only one power unit you can control 2 solenoid-controlled pilot-operated directional control valve
Hi! Your presentations are great! Just to help, on the graphic cutaway, A and B should be switched, thanks for your videos!
that's my feedback too..
very informative video about dcv thanks
thanks ,,great presentation
We need chock valve controlling video
Very nice video. keep upload about more hydraulic videos
Mate, what is with the ominous back ground music? Is this the pilot valve of doom??????
very helpful thank you
Please explain if I use lower valve p to t how to make a hydraulic circuit.
That was awesome.
Verry verry good video make a video on pressure control module with animetion
thanks for nice explanation .. please give one session about internal and external pilots .. one doubt in this y all pilot valve are J spool y not other like H , G , etc..
Excellent video. What is the application of these type of valves? If I am not wrong, Steam turbine control valve?
Kindly correct me if I am wrong.
Thanks.
Thanks for the question. These valves are common for directional control of cylinders or hydraulic motors in any application where there will be a high rate of flow. We commonly find them on the chip truck or rail car dumpers at a pulp mill, or on the rail car dumping system at a ship loading terminal. That's just one or two examples.
These valves are used in Injection Cylinder of a 250 ton Rubber injection Molding presses for injecting the rubber into die. These valves are also called as slave valve. These valves are used when high requirement of flow is to be achieved.
thanks to present the video s
Very knowledgeable vidio
I have a dovt .PC 130 hydraulic system