Pirority valve or flow control?

   / Pirority valve or flow control? #1  

muddstopper

Veteran Member
Joined
Apr 11, 2006
Messages
2,303
Location
western NC
Tractor
Ventrac, Steiner
Trying to figure out how to plumb this circuit.
Will be pumping 30gpm, but wish to split this flow between a hydraulic motor (25gpm) and a hydraulic cylinder (5gpm). The 25gpm will come off the valve and go to a electric selenoid valve with a relief set at 1800psi. The cylinder will need to be relief at maybe 100psi and just need 5-75lbs of force. Hoping to be able to adjust the valve relief down enough below the 1500psi it is preset at. I am looking at the 2 valves at the top right and left hand side of this page http://www.surpluscenter.com/Catalog/Catalog287-037.pdf and trying to decide which would be the better choice to make this work. Or if i need to be looking at a different valve or method altogether.
Hopeing someone can help me out with this
 
   / Pirority valve or flow control? #2  
   / Pirority valve or flow control? #3  
Muddstopper:

THe Prince adjustable priority flow control valves are actually cheaper than the fixed priority valves, I suppose because the springs do not have to be as precise since the priority is use adjustable. Look at valve RD112-30. If it turns out that the 5/25 split is not what is best, you change it simply by moving the lever.

Note also that the relief valve in all the priority flow control valves is on the "in" port, because if flow out of the priority port is blocked completely, the valve automatically blocks flow out of the excess port as well (trying to force fluid out of the priority port), and none of the input flow passes through the valve.

As JJ said, you will need a separate relief valve in the cylinder circuit set at 100psi.

Sounds interesting. What are you building?
 
   / Pirority valve or flow control?
  • Thread Starter
#4  
Looks like I can use either/or in this case. If i understand this correctly, the low flow has priority and is also the same port that has the built in relief. Then, is the high flow not relieved, as it comes out of the divider? Not really a problem as I had planned on a relief between the pump and the divider, (or do I need it between divider and motor) This way I can reduce pressure to the hydraulic motor and then use the divider relief to further reduce pressure at the cylinder. Am I looking at this right? or am I backwards in my thinking of how the relief in the divider circuits work?

I was already leaning toward the adjustable flow controls simply because it allows a little fine tuning. My saw motor will handle more flow if I have to dump oil off the cylinder to slow it down

I am working on my firewood processor build. The circuit I am trying to complete is the saw motor and the saw cylinder. The saw cylinder doesnt need a to be fast or have lots of force. I plan on a electric switch on the control valve for the saw cylinder to activate the electric solenoid valve for the saw and the electric pump for the bar oil. The electric valve also has a adjustable relief built in, which is why I had planned on a relief before the divider valve instead of after the valve.
 
   / Pirority valve or flow control? #5  
Mudd.. if you are going to use the divider i would use a pressure reducing/relieving valve on the 5 gpm side instead of a pressure relief, the PRR's will control the low pressure a lot better especially if you are going to use an electric valve for the cylinder . PRDB | Sun Hydraulics


Install a PR after the pump and set it for the saw motor psi, it goes to the flow control, on the cylinder side install the sun cartridge then on to your cylinder valve. on the saw side of the flow going to the motor..
 
   / Pirority valve or flow control?
  • Thread Starter
#6  
I will check out the pressure reducing/relieving valve. The only electric valve I plan on is for the saw motor. I already have the electric valve that will handle 30gpm and figure the best easiest place to use it would be the saw motor. Everything else will be manual spool valves.
 
   / Pirority valve or flow control?
  • Thread Starter
#7  

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