Hydraulic Line ? for Log Splitter Project

   / Hydraulic Line ? for Log Splitter Project #12  
Do not use hydraulic hose for suction hose. Easiest way to blow a pump.
3/4" hose is way overkill. Use 3/4" suction hose to the pump, 1/2" from the pump to the valve and valve to cylinder, then at least 5/8" from valve to filter then tank. 1/2" hose bumps your pressure rating up to 3500 psi.
 
   / Hydraulic Line ? for Log Splitter Project #13  
I looked at this one, but can't justify spending $268 when I could spend $90 on this: Surplus Center - 1 SPOOL 25 GPM PRINCE LS30002 VALVE

The two way detent is the same price, but I've got a 3 year old crumb cruncher and I've got to keep his safety in mind. Maybe when he gets older I can graduate to the auto valve.

The max relief adjustment on that valve is 2750 psi.

Here is the standard log splitter valve at Surplus Hyd for about $69.

https://www.surpluscenter.com/item.asp?item=9-1262&catname=hydraulic.

This valve has max relief of 2750 psi.

You really don't want two way detent standard valve.. That locks the valve on. If you walk away after setting a detent valve, it will get to the end of the cyl travel, and start screeching. The log splitter valve is designed to set the detent, and when the pressure gets to the detent release pressure, the lever shifts back to neutral.
 
   / Hydraulic Line ? for Log Splitter Project
  • Thread Starter
#14  
Do not use hydraulic hose for suction hose. Easiest way to blow a pump.
3/4" hose is way overkill. Use 3/4" suction hose to the pump, 1/2" from the pump to the valve and valve to cylinder, then at least 5/8" from valve to filter then tank. 1/2" hose bumps your pressure rating up to 3500 psi.

Ok, so you're advising to use a 'suction hose' which provides less restrictive flow in lieu of a true hydraulic hose. I understand this concept.

As far as 3/4" being overkill, I was told by another fellow on here that 3/4" is the best size all around for a 5" cylinder and 16gpm pump. In your opinion, will it "hurt" anything if I use 3/4" hose from the pump to valves, thru the cylinders and to the tank?

It makes sense that dropping to 1/2" hose increases pressure, but a smaller size means less flow. Is that right?
 
   / Hydraulic Line ? for Log Splitter Project
  • Thread Starter
#15  
The max relief adjustment on that valve is 2750 psi.
Here is the standard log splitter valve at Surplus Hyd for about $69

You really don't want two way detent standard valve.. That locks the valve on. If you walk away after setting a detent valve, it will get to the end of the cyl travel, and start screeching. The log splitter valve is designed to set the detent, and when the pressure gets to the detent release pressure, the lever shifts back to neutral.

JJ-I understand how the detent works, this one has it only on the return stroke and its spring centered on the extend stroke. I would prefer this kind versus the two way detent for safety reasons. But I thought/still think that I need to have the style with the 3/4" work ports for proper use with my 5" cylinder and 16 gpm pump. Would you agree with going to the style that has 3/4 work ports? Thanks again for your help.
 
   / Hydraulic Line ? for Log Splitter Project #16  
LanceH said:
Ok, so you're advising to use a 'suction hose' which provides less restrictive flow in lieu of a true hydraulic hose. I understand this concept.

As far as 3/4" being overkill, I was told by another fellow on here that 3/4" is the best size all around for a 5" cylinder and 16gpm pump. In your opinion, will it "hurt" anything if I use 3/4" hose from the pump to valves, thru the cylinders and to the tank?

It makes sense that dropping to 1/2" hose increases pressure, but a smaller size means less flow. Is that right?

You use suction hose because it is made to not collapse under a vacuum. Your hydraulic hose will get sucked shut and starve your pump. I have seen it happen. There is a hyd hose company in Jersey that bought an excavating company a $7,000 pump because they were out of suction hose and sold hyd hose instead. Suction hose has the same flow as hyd hose, just a different construction so it won't get sucked shut.
My opinion, using 3/4" hose won't hurt anything. Guys like J_J are better than the math than I am. 1/2" will last longer because of the higher pressure rating and log splitters I have seen in this class all use 1/2" hose. If it were mine, I would use 1/2".
 
   / Hydraulic Line ? for Log Splitter Project
  • Thread Starter
#17  
That makes sense. Thats a good way to put it in prespective. Maybe I'll pay the extra money for real suction hose instead of skimping by and buying the reinforcing clear hose from Lowe's. Thanks again for the info.
 
   / Hydraulic Line ? for Log Splitter Project #18  
, but a smaller size means less flow. Is that right?
In a fixed displacement pump/constant flow system, a smaller size hose means higher oil velocity and higher pressure drop (power loss). As long as part of the pump flow do not get diverted in control valve or by passed through the pressure relief valve, flow will stay the same through a smaller size hose.

Most hose size recommendations (nomograms) for 16 gpm, will show at least 5/8" for pressure line, 3/4 to 7/8" for return lines and 1 1/4 to 1 3/8" for suction line.

Under size pressure and return lines will gamble with heat creation, you might get away with smaller size under intermittent operation. Under size suction line can starve the pump

Note that you might need 4 wire hose for larger sizes....$$$....

All recommendations are based on a fixed viscosity, thicker oil takes larger size.
 
   / Hydraulic Line ? for Log Splitter Project
  • Thread Starter
#19  
In a fixed displacement pump/constant flow system, a smaller size hose means higher oil velocity and higher pressure drop (power loss). As long as part of the pump flow do not get diverted in control valve or by passed through the pressure relief valve, flow will stay the same through a smaller size hose.

Most hose size recommendations (nomograms) for 16 gpm, will show at least 5/8" for pressure line, 3/4 to 7/8" for return lines and 1 1/4 to 1 3/8" for suction line.

Under size pressure and return lines will gamble with heat creation, you might get away with smaller size under intermittent operation. Under size suction line can starve the pump

Note that you might need 4 wire hose for larger sizes....$$$....

All recommendations are based on a fixed viscosity, thicker oil takes larger size.

AkkaMaan...you posted up one of these nomograms/charts that showed that a 3/4" hose and it only makes sense. I mean Prince offers these valves with 3/4" working ports and it specifically states (on Northern's website) that this valve is designed for use with 5" cylinders and up to 16gpm pumps. So I can only believe that there is no harm in using 3/4" pressure line. Are you pulling those nomograms from somewhere online that you could share or is it a scan from a book you own? Thanks for your knowledge.
 
   / Hydraulic Line ? for Log Splitter Project #20  
If the cyl port size is 1/2 in, and the valve is 3/4 in, You will have to adapt one end of the hose. Which ever way uses less fittings. I would go with 3/4 on all hoses except the suction hose. Use the same size that is on the suction port of the pump.

Inlet port on those 16 GPM pumps is 1 in.
 

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