Can you reduce gpm this way?

[sizzami]

thanks jj for the answer but I still am wondering about the supposed cavitation issue I say that isnt going to happen with a .25 restriction on a 1.5 line I do it all the time .

 

[AKKAMAAN]

thanks jj for the answer but I still am wondering about the supposed cavitation issue I say that isnt going to happen with a .25 restriction on a 1.5 line I do it all the time .

the total effect of a restriction is not only a matter of restriction size....it also so depends of the lenght of the restriction....all crimp fittings on a hose....lets say 1/2", will restrict to like 3/8 at the fitting....but that doesn't mean that a 3/8" hose is ok....all restrictions are "bad", but impossible to avoid...and all "restrictions" will add up to a total restriction.....but the smallest "opening" will have the biggest impact....

sometimes the outlet port on the pump is 3/4" and the inlet port on the controlvalve is 1/2"....that doesn't mean a 1/2" hose is ok.....you still will benefit from choosing a 3/4" hose, especially if it is a longer hose....

you want the longest passage to determine the lowest possible fluid velocity (that is usually the hose/pipe/tube), and the keep all fittings as large as manageble....it is restriction cross area,the fluid velocity and the actual viscosity the determines the pressure drop (power loss)

It is the hardware cost (economy) and maximum acceptable weight, that sets the limit for how large hoses/fittings we can use...thats why so many logsplitters, low priced equipment etc. many times struggle with overheating......manufacturers cut corners when designing the hydraulics.....

 

[sizzami]

with respect te lengtjh of a retriction is not that important, thats why its called a hydrauilic circuit because it can only go in as fast as it goes out, and furthermore most hydraulic overheating is caused by reivoirs that are too small.

 

[AKKAMAAN]

with respect te lengtjh of a retriction is not that important, thats why its called a hydrauilic circuit because it can only go in as fast as it goes out, and furthermore most hydraulic overheating is caused by reivoirs that are too small.

ALL "over"-heating is caused by restriction.....but under sized and poorly designed reservoirs are unable to cool down the fluid before it goes back into pump again....

 

[J_J]

with respect te lengtjh of a retriction is not that important, thats why its called a hydrauilic circuit because it can only go in as fast as it goes out, and furthermore most hydraulic overheating is caused by reivoirs that are too small.

Way back when, the reservoirs was 3 to 5 times the GPM of the pump. They have reduced that down in mobile use to a 1 to 1 ratio. and they are also using fan cooled radiator on some equipment. If the engineers have done their homework and actual testing, they are cutting it kind of close to keep the cost of the parts down, and keeping the fluid below to 220 degrees.