Hydraulic Schematic - please explain!
Hydraulic Schematic - please explain!
(OP)
Could somebody please explain the following Hydraulic Schematic?
There are 2 pumps. The left is simply for the heat exchanger. The main pump (on the right), I understand to be of constant speed with the pressure regulated by a proportional valve.
However the schematic would seem to indicate that the pump is variable displacement (symbol-slanted arrow across pump) with a mechanical feedback on pressure.
What does the 'P' represent? I assume it is pressure.
The max pressure is 300Bar with over-pressure protection from a relief valve on the supply side.
Any comments welcome.
Regards,
Speedy
htt p://photob ucket.com/ albums/c22 /eohallora n/?action= view&c urrent=Pum pSchem.jpg
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There are 2 pumps. The left is simply for the heat exchanger. The main pump (on the right), I understand to be of constant speed with the pressure regulated by a proportional valve.
However the schematic would seem to indicate that the pump is variable displacement (symbol-slanted arrow across pump) with a mechanical feedback on pressure.
What does the 'P' represent? I assume it is pressure.
The max pressure is 300Bar with over-pressure protection from a relief valve on the supply side.
Any comments welcome.
Regards,
Speedy
htt
..





RE: Hydraulic Schematic - please explain!
I'm half tempted to suggest that it might be a pressure piloted clutch to drive the pump in the left block.
RE: Hydraulic Schematic - please explain!
RE: Hydraulic Schematic - please explain!
You might post your question on the International Fluid Power site-there is a forum there that is frequented by some fluid power professional and there is the fluid power forum here as well. I could find no symbols such as drawn to the left of the pump. I would assume that one of these is supposed to represent a relief valve as there should be one in close proximity to the pump and possibly part of the other unknown symbol representing the control option for the varible pump i.e. pressure compensated,load sensing etc Maytag
RE: Hydraulic Schematic - please explain!
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Bring back the HP-15
www.hp15c.org
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RE: Hydraulic Schematic - please explain!
RE: Hydraulic Schematic - please explain!
The symbol that the P is in indicates a control method - it is a general symbol without indication of control type (types can be push button, foot pedal, lever, etc...). This is then connected to the pilot w/ adjustable spring (on the schematic). Perhaps it it is the pressure compensator with a manual lever in addition to the spring-adjustable pilot. I've never noticed a P symbol in one before, but I guess someone just meant it to mean that it is the pressure compensator controller. The pressure compensated pump will put out a variable flow to maintain a constant pressure according to the setting of the pressure compensator.
RE: Hydraulic Schematic - please explain!
Can you find a manufacturers name on the pump? A part number?
The best place to look for a symbol that is not covered in ANSI or ISO symbol literature is in the manufacturers catalog. They have the symbol and usually post an explanation of what is happening with each component in the symbol.
Symbol literature like ANSI and ISO are for general info and do not and cannot cover every type of combination that can be made by using available components. On top of that, when someone has to make a symbol to cover a device they produce it always is up to their interpretation of standard symbols. I look back at some I have put together over the years and wonder what I was thinking when I made that one.
If I had to interpret it from what the symbol indicates I would say it is a Variable Volume Uni-Directioonal Pump with a Proportional Control for Volume Output and a Manual Override at the pump to operate the displacement for setup.
"P" could mean Proportional for the Manual Operator to the left of the square it is in????
Find a catalog and if it is Parker, Vickers, Rexroth there will be a fairly comprehensive explanation of all their control types.
Bud Trinkel CFPE
HYDRA-PNEU CONSULTING, INC.
fluidpower1 @ hotmail.com
http://www.fluidpower1.us