Pressure Compensated Flow Control - Part 1
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- Опубліковано 3 січ 2025
- We'll spend the next three videos looking at the Pressure Compensated Flow Control. This valve has a fairly simple design, and it produces a simple effect, but how the effect happens is quite fascinating. In this part one video, let's get familiar with the valve components, schematic symbols, and behaviour.
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Nice video.
Love you brother!!!!! awesome! helped me out at a critical moment :) may god bless you!!!
It will be great if you show a picture of the Reductor Presure. And also some practical aplication.
What software is used to make this ?
Normally flow control is achieved by reducing the cross section through which the oil is flowing. But continuity equation states that product of Area x velocity is constant through out the tube. So when area is reduced, velocity increases and flow should remain the same. Then how does reducing the cross section helps us in flow control?
The change in the cross section area helps to reduce or increase the pressure drop due to the load pressure but there's no change in the flow but how?
The pump pressure is constant 2000 PSI which means a constant flow across the relief valve.
(The pump and relief valve is not included in the video but i think you can figure out how the system work now)
You are right if it is a constant flow source , then you cannot control flow . Continuity equation holds true for steady state conditions ..when you change the area of needle valve to new position the system reaches new steady state value with different inlet pressure . This pressure is used to reduce the displacement of the pump and hence the flow reduces , the system reaches another steady state condition.
I have pondered long over this ,i find the concept of having a needle valve to control flow as difficult to digest. Going by physics, needle valve cannot control flow if it is a constant flow source.But always it is taught in hydraulic classes that way with no regard to what energy source we are working with . Any better answers would be appreciated.
Great learning opportunity
Excellent video. Does it work like a governor in prime movers etc? What is the application of pressure compensated flow control valve?
Thanks for your excellent videos.
Yes, a little like a governor. This valve is an inexpensive way to achieve fairly accurate cylinder stroke speeds or hydraulic motor shaft speeds, even when pressure values are inconsistent. A simple needle valve flow control cannot accomplish this level of speed accuracy during pressure fluctuations.
What is the best method for setting pressures on a system where 2 or more variable displacement pumps supply a common output? Choosing leading/lagging pumps? Staggering pressures? What should be the pressure difference between pumps if they are ~3000 PSI pumps?
I have had good results with a pressure difference of about 100psi. Each pump should be equiped with a check valve on its output. Remember that in this configuration the lowest adjusted pumps will supply most of the flow and the higher ones will vary in volume the most; so wear can be unequal. But, if adequate filtration and cooling are provided on the system, there should be no problems.
Can you show the hydraulic symbol for pressure compensator
great instruction thank you
great video, thank you. But what's with the ominous rumble in the background? Seriously distracting!
Custom Valve Concepts makes a pressure compensated flow control valve under the name.
tq sir
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