Flow control

[glastron23]

the answer is yes and no... what are you using the motor for, is it to propel a wheeled vehicle or is the motor turning a gear box or is it on the end of a conveyor??
you will require one on a wheel motor if the weight of the vehicle can turn the motor with out using the hydraulics and maybe one on a gear box if it has the ability to turn the motor by itself but not really necessary on the conveyor if you are using it on shallow slopes. http://www.princehyd.com/Portals/0/products/valves/catalog/ValvesRd5000.pdf

check on page 7 and it will show the different types of valves. The motor spool connects the 2 ports of the motor when the valve is in neutral so if the motor is turned by the load then it will not hydro lock the motor and damage it.
It you are going to install another valve bank or use an empty valve on your tractor then the flow control is not required, the spool will control the speed. If you want the motor to turn all the time without having to hold the handle then the flow control is the way to go, then you do not require the spool valve as the flow control will act as the spool. We use a lot of these for motor controls where you set and forget it. you can reverse the motors with this unit also.

http://www.princessauto.com/power-t...088-rotary-actuated-directional-control-valve

 

[luscsmith]

This is a rock picker project. So I am thinking all that I would need is a flow control.
Where would be the best spot get the hydraulic pressure and return the fluid?

Thanks, Scott

 

[J_J]

Just plug your motor into the remote outlets, and bungee the lever for continuous operation.

If this is a slow speed hyd motor operation, and you want the motor to stop, just ease the lever back to neutral. Don't let it snap back to neutral.

 

[luscsmith]

The manufacture of the picker says to use a flow control. Is it safe to dump the waste oil back to the sump via the fill plug or will that aerate the fluid?

Thanks, Scott

 

[J_J]

Should be alright.

 

[oldnslo]

The manufacture of the picker says to use a flow control. Is it safe to dump the waste oil back to the sump via the fill plug or will that aerate the fluid?

Thanks, Scott

It will aerate the fluid.

Are you going to be running other functions while having this motor in operation?

 

[luscsmith]

Thank you JJ, I will install a flow control and dump back through the fill plug.
I just wanted to be sure because I do not want to harm my tractor.
I will order the control but it will be a while to get it installed because of time and I am fat and getting older.(never thought I would)

Thanks again, Scott

 

[luscsmith]

It will aerate the fluid.

Are you going to be running other functions while having this motor in operation?

Yes, the rest of the picker and the shuttle on the tractor.

Thanks, Scott

 

[J_J]

If you will be using the remotes, and it is next to the last valve in the hyd circuit, if you are using a valve upstream of the motor control, then be aware that the upstream valves have priority and can reduce the speed to nothing if all the fluid is being used upstream in the hyd circuit.

As far as aerating the fluid, then have the discharge hose below the level of the hyd fluid.

 

[luscsmith]

JJ, am I safe to say that I can tee the return from the motor and the overflow from the flow control together and then back to the remote?

Thanks again, Scott

 

[J_J]

I have thought about that, but there is a possibility of sending fluid through the valve backwards, if you moved the valve lever the wrong way. Safest way would be to dump the hyd motor fluid directly sump/tank. I am not so sure that the additional flow control valve is really necessary.

Are you sure you do not want to use the remote valve for operation of the hyd motor. For speed control, an adjustable needle valve in the motor circuit can control speed. Less money.

You could use the remote valve to set any speed, You adapt an adjustable rod hooked around the remote lever and adjusted for the speed you want, for much less money. Just trying to find easier ways of setting speed.

 

[luscsmith]

Would the needle type restrictor cause the PRV to open and heat the fluid?

Scott

 

[J_J]

The flow restrictor will cause some heat, but the relief will only activate if the hyd motor stalls. Then it would only relieve until the stall is fixed, or you put the lever in neutral.

 

[luscsmith]

"You could use the remote valve to set any speed, You adapt an adjustable rod hooked around the remote lever and adjusted for the speed you want, for much less money. Just trying to find easier ways of setting speed."


Will my remote act as a throttle not just on-off?

Scott

 

[J_J]

If you want, do this test. Just plug your hyd motor into your remotes and play with the lever some.

If the remote valve is sized for the flow, You should be able to feather, and run any speed on the hyd motor. You should have fwd and reverse. Do you know the max speed of your hyd motor?

 

[luscsmith]

I do not know the speed, but it is 12GPM @ 1500PSI.

Thank you, Scott

 

[J_J]

You will have to reset the relief on your remote valve to about 1450 psi to protect the motor, or a relief valve across the input and output of the hyd motor, set to about 1450 psi..

 

[luscsmith]

Thank you very much JJ, I will pick up the rock picker this weekend if weather is good. I will then start the process of making it opperate with my tractor.

Again thanks for your knowledge, Scott

 

[oldnslo]

Scott,

I may have missed this in an earlier post but, is the hydraulic system on this vehicle going to be open center (fixed displacement pump) or Closed Center (variable volume pump). The type of circuit you have will dictate what valves work or better or best.

Using the directional valve will not keep the motor steady if the load changes unless you are using a Closed Center system with Load sense.


ALL flow controls create heat by design. Since this is a motor application the heat will be continuous. Have you considered running this function with the PTO? This would eliminate the concerns of heat, return oil, motor control with other functions running etc... Speed could be adjusted by engine RPM when or if neccessary.

Roy

 

[luscsmith]

Scott,

I may have missed this in an earlier post but, is the hydraulic system on this vehicle going to be open center (fixed displacement pump) or Closed Center (variable volume pump). The type of circuit you have will dictate what valves work or better or best.

Using the directional valve will not keep the motor steady if the load changes unless you are using a Closed Center system with Load sense.


ALL flow controls create heat by design. Since this is a motor application the heat will be continuous. Have you considered running this function with the PTO? This would eliminate the concerns of heat, return oil, motor control with other functions running etc... Speed could be adjusted by engine RPM when or if neccessary.

Roy

Roy, I do not know about the motor, I will know more after I pick up the attachment.
Yes I have thought about running it off of the PTO but that would be more added cost. A PTO pump and tank are very much still in the equation, whatever it takes to make it work correctly.

Thanks, Scott