flow controller.
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The flow control valve is used on the Case/Ingersoll tractors primarily for the purpose of setting and maintaining fine travel speed control.
Specifically, a flow control is a pressure compensated valve which is designed to meter a continuous FLOW rate (gallons per minute) of oil to a working circuit.
(Continuous is really a maximum ... you've got to have speed/flow from the pump to get up to the max flow set on the FCV).
In the Case/Ingersoll application, this is inserted prior to the travel control valve, thereby assuring a specific maximum amount of oil will go to the TCV. You can, for example, dial down the oil rate to the TCV to 1 GPM, regardless of engine RPM and pump output. Then you can throw the travel speed control wide open and get great pulling pressure/torque, but always be at a slow speed (e.g. about 1/8 of the normal 8 GPM top speed).
This is great for tilling, as you often wish to move quite slowly, but the drag load varies considerably, constantly changing the drive motor pressures, so it is quite hard to finesse with the speed control lever.
I can certainly envision usages for this in your application, but frankly would not further compound the hydraulics on that tractor. You cannot use this valve like a priority flow valve. Due to the pressure compensation circuitry in the valve, the excess oil cannot be ported downstream to a working circuit ... only to reservoir return oil.
Brian
Specifically, a flow control is a pressure compensated valve which is designed to meter a continuous FLOW rate (gallons per minute) of oil to a working circuit.
(Continuous is really a maximum ... you've got to have speed/flow from the pump to get up to the max flow set on the FCV).
In the Case/Ingersoll application, this is inserted prior to the travel control valve, thereby assuring a specific maximum amount of oil will go to the TCV. You can, for example, dial down the oil rate to the TCV to 1 GPM, regardless of engine RPM and pump output. Then you can throw the travel speed control wide open and get great pulling pressure/torque, but always be at a slow speed (e.g. about 1/8 of the normal 8 GPM top speed).
This is great for tilling, as you often wish to move quite slowly, but the drag load varies considerably, constantly changing the drive motor pressures, so it is quite hard to finesse with the speed control lever.
I can certainly envision usages for this in your application, but frankly would not further compound the hydraulics on that tractor. You cannot use this valve like a priority flow valve. Due to the pressure compensation circuitry in the valve, the excess oil cannot be ported downstream to a working circuit ... only to reservoir return oil.
Brian
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Thanks Again Brian.
That answers my question. I wasn't sure I could use that type of valve on my loader tractor. Simply because I need pressure at both the TCV, And the Loader Valve at the same time.
It's too bad though. I was hopeing for something that could split the pressure/flow to both at the same time.
:thanku:
Jay
That answers my question. I wasn't sure I could use that type of valve on my loader tractor. Simply because I need pressure at both the TCV, And the Loader Valve at the same time.
It's too bad though. I was hopeing for something that could split the pressure/flow to both at the same time.
:thanku:
Jay
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OK This is not the same as a flow control valve? It is an adjustable divider. It IS Use in applications where two circuits are supplied oil at the same time.
Adjustable from 2 to 14 GPM.
SO whats the difference :dunno:
:thanku: Thanks for the help in sorting this out. So far I'm following, but I don't understand how 2 valves with similar outputs, don't do the same job.
What are the differences?
Between a flow control valve and a priority valve?
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No a flow control valve and a priority divider valve are different types of valves.
A flow control valve is for controlling flow to ONE circuit by restricting it.
A priority valve divides flow to TWO circuits and dedicates a certain GPM to one circut (Priority) an the rest of the excess flow goes out to the second circuit.
A flow control valve is for controlling flow to ONE circuit by restricting it.
A priority valve divides flow to TWO circuits and dedicates a certain GPM to one circut (Priority) an the rest of the excess flow goes out to the second circuit.
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Yeah! I'm checking that out just now. on other sites, but in my case, if i were to plumb a "PRIORITY" Valve off of the pump, with 2 gallons going to the loader valves, that return to tank, and 6.5 or 7 gallons to the TCV that also returns to tank, would that be possible using a valve like that? :dunno:
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Correct, the priority valve and flow control are different. The substance is how they respond to pressure in the system, which amounts to a demand for work to be done.
These are some pretty decent articles on teh subject, so I won't try to go further here:
http://www.daerospace.com/HydraulicSystems/PriorityValveDesc.php
http://www.daerospace.com/HydraulicSystems/FlowControlValveDesc.php
In short, you want a system arranged so that critical circuits get power first ... such as a steering circuit (like on an Ingy with P/S).
If you were just to put the loader on a priority circuit, then it would be back to a prior problem of the tractor stopping suddenly when the loader cylinders are engaged, with engine at lower speeds. Regardless of engine speed (pump GPM) it would directly change the travel speed as soon as a loader cylinder is activated.
Ultimately some of these interactions are what motivates manufacturers to split the hydraulic systems ... often with a tandem pump like was used on the 6000/7000 loaders.
Brian
These are some pretty decent articles on teh subject, so I won't try to go further here:
http://www.daerospace.com/HydraulicSystems/PriorityValveDesc.php
http://www.daerospace.com/HydraulicSystems/FlowControlValveDesc.php
In short, you want a system arranged so that critical circuits get power first ... such as a steering circuit (like on an Ingy with P/S).
If you were just to put the loader on a priority circuit, then it would be back to a prior problem of the tractor stopping suddenly when the loader cylinders are engaged, with engine at lower speeds. Regardless of engine speed (pump GPM) it would directly change the travel speed as soon as a loader cylinder is activated.
Ultimately some of these interactions are what motivates manufacturers to split the hydraulic systems ... often with a tandem pump like was used on the 6000/7000 loaders.
Brian
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Surplus center sells ones that do have a relief built in.
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Would you have a link for it? I can't find anything on the Canadian side, I will have to order it from my dealer if I want something, but It helps if I show them a picture and description first, they dont always understand half of what I am doing.
:thanku:
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It is a prince product so you should be able to find it however surplus center does ship to Canada.
https://www.surpluscenter.com/item.asp?item=9-4158-3&catname=hydraulic
https://www.surpluscenter.com/item.asp?item=9-4158-3&catname=hydraulic
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Thanks, thats what I'll show them, I know they carry Cross product, but who knows?
Anyways I'm getting ready for this week, the forecast is for below freezing, with precipitation. Never know, could be getting seat time.
raying::thanku: :thanku: :thanku:
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Mean while, the forecast is for lots of precipitation this week, WE Hope for some snow, so much, I transfered the grader blade for the snowblower this afternoon. (it took me 1 minute flat to change from the grader blade to the blower) I love 3 point.
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