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Bernoulli |
I have a piston controled by a 4ways 3 positions valv, in this way the motor in consuming 15 amp and the presure is 500 psi at lifting the load; but the liking of the valv do not permit me to use the sistem like that; so, I put a 1/2 parker in line check valv and a 2 ways 2 postion electric valv to prevent the liking and permit the low down of the charge; but the current increases to 25 amp anth the presure 1200 psi; that is the check valv increases my pressure in 500 psi ????. The punp is 12 gpm, as well the check valve; If I use a 3/4 ckeck valv still I have a increase of 200 psi; why is so large the elengy loose???,
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Bourdon |
All energy loss in a hydraulic circuit is from Restriction to Flow since Restriction to Flow forces the pump to push the oil harder to get through the circuit. Undersize Valves or Flow Lines is usually causing the Restriction. As you noticed, increasing the Check Vlve reduced pressure by a god amount. Always use information from the valve manufacturer to check for Pressure Drop through their Valves and size the Flow Lines to a Pressure Drop of 30-50 PSI for their installed length. Your description of the circuit is not at all clear. Posting a schematic would be a help. The schematic should show Part Numbers and Flow Line sizes to be of any help. Bud Trinkel FP Consultant Retired "Fame is a vapor, popularity an accident, riches take wings. Only one thing endures, and that is character." -- Horace Greeley |
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Reynolds |
I think your cylinder with the load in it is overruning, vertically down, or I hope not over-center overunning.
You could have bought only a counterbalance vave piloted from the other port. maybe a sandwich type. check valves(pilot operated tend to increase the pressure but only for a short period of time from between the stroke. was your relief valve set at 1200 psi? if it is then there is sufficient restriction on the line |
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Bernoulli |
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Bernoulli |
The presure in the line, when no flow is only 200 psi, and acordig with the load and piston area, the presure must be at no more than 400 psi( maybe I am over estimating the load). If I use a a counterbalance valve, the presure goes to a 1100 psi, so no big changes. I attache the hydraulic circuit, and as you can see the presure increases after the check valve, as the manometer reads and also before, as can be observed in the energy consuption.  |
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