Hello everyone if you have any ideas pls let me know.. 24 Hp Unit with 1.83 displacement fixed gear pump with pressure compensated flow control valve. Engine is reveed up to 3600 rpm i installed a a small 1/2" flow control needle valve to test pressure . I have set the main flow control valve to 12 gpm then start closing the needle valve to test my pressure when the pressure hits 1300 psi the engine bogs down and shutts down. Note Brand new 24hp v-twin honda calcualtions indicate i only need 17 hp to run this pressure setting. The relief valve has been set to 2100 psi using a haldex hi/low pump with no problems with the main flow control valve so i guessing its not the flow control valve also the hydraulic pump has been replaced with same problem of engine bogging down any ideas????????

The proper way of testing a pump flow and pressure capability, as well as the primemover is to use a relief valve and a flow meter at the return line of relief valve(pressure line flow meters are more expensive).

There was a thread posted by Dale about a HI-Lo( i think similar), and the high volume is unloaded internally(?!). The High and low flow can be measured externally below the unloading valve setting only. Assuming the unloading valve is working properly, and you try to block(totally) the flow of the low volume/high pressure cant go nowhere(it cant go to unloading valve), which could result to a very high pressure(might break fittings too) may stall/stop the primemover.

Installing a flow control immediately after the discharge port with this type of pump is not a good idea(IMO only). When choosing a double pump(fix) for some conventional application, it is better to size it properly to get the maximum speed of the actuator at less/no-load.

With Dale's thread, there is no relief valve, I dont know about your's it there is... really... and if it is just an unloading valve, thats quite a high setting.

Hummnn, am I working and very dedicated to this forum?! , LOL...

quote:

Originally posted by eslcorp:
Hello everyone if you have any ideas pls let me know.. 24 Hp Unit with 1.83 displacement fixed gear pump with pressure compensated flow control valve. Engine is reveed up to 3600 rpm i installed a a small 1/2" flow control needle valve to test pressure . I have set the main flow control valve to 12 gpm then start closing the needle valve to test my pressure when the pressure hits 1300 psi the engine bogs down and shutts down. Note Brand new 24hp v-twin honda calcualtions indicate i only need 17 hp to run this pressure setting. The relief valve has been set to 2100 psi using a haldex hi/low pump with no problems with the main flow control valve so i guessing its not the flow control valve also the hydraulic pump has been replaced with same problem of engine bogging down any ideas????????

An 1.83cui displacement pump takes 0.46hp for every 100psi and 1000rpm's....in-efficiancy not counted for...that makes 21.6 hp at 3600rpm/1300psi...in-efficiancy not counted for....divide with 0.80-0.90 for inefficiancy....total hp about 24-27 hp....

Check your numbers and math once again...

formula to calculate pump power herepump power

This message has been edited. Last edited by: AKKAMAAN,

hello everyone here is teh video link to my system i posted it on youtube so you can see it.

http://www.youtube.com/watch?v=d5APg6JVsGE

I have a relief valve in the main flow control valve and the main flow control it dumps the excess oil so tehre is no backing up problem or shouldnt be i would think (im not an expert)

also the engine in normal operating conditions should bog down to 2800-3000 rpm thats how the calculation was done throug online calculator so there should be any error on my part so im just wondering if the main flow control valve is creating excessive back pressure.

Is your gauge the downstream reading? The gauge should be in the main P- line(P-in to the flow control valve. Press / temp flow control valves could have a gauge point connected downstream because it is the load pressure that has to be sensed that could vary the flow thru it( pressure feedback to compensate due to load pressure change).

quote:

Originally posted by AKKAMAAN:

quote:

Originally posted by eslcorp:
Hello everyone if you have any ideas pls let me know.. 24 Hp Unit with 1.83 displacement fixed gear pump with pressure compensated flow control valve. Engine is reveed up to 3600 rpm i installed a a small 1/2" flow control needle valve to test pressure . I have set the main flow control valve to 12 gpm then start closing the needle valve to test my pressure when the pressure hits 1300 psi the engine bogs down and shutts down. Note Brand new 24hp v-twin honda calcualtions indicate i only need 17 hp to run this pressure setting. The relief valve has been set to 2100 psi using a haldex hi/low pump with no problems with the main flow control valve so i guessing its not the flow control valve also the hydraulic pump has been replaced with same problem of engine bogging down any ideas????????

An 1.83cui displacement pump takes 0.46hp for every 100psi and 1000rpm's....in-efficiancy not counted for...that makes 21.6 hp at 3600rpm/1300psi...in-efficiancy not counted for....divide with 0.80-0.90 for inefficiancy....total hp about 24-27 hp....

Check your numbers and math once again...

formula to calculate pump power herepump power

Hello yes i talked to the pump engineer he said i should use a .85 displacement pump and should be able to run on 24 hp i got lost running those calcualtions but welll see what happens with the lower displacement pump.

Sounds good to me....You will have a lot of extra power for a pressure increase if needed...
Thanks for the feed back