In a jack with a ram only on one side and hydraulic fluid applied from both sides
- the ram will remain stationary, since equal hydraulic fluid pressures cancel on both sides of it.
- the ram will move away from the side where the ram is due to pressure on differential areas.
- the ram will move to the side where the ram is, due to pressure acting on differential areas.
chevychase asking:
surly if the ram takes up say 2 sq in and the jack piston has area of say 6 sq in, the piston minus ram area will be 4 sq in. Giving an overall advantage to the bare piston face equivelent to 2 sq in (the area of the ram) with equal pressure there is a net unbalanced force onthe bare piston face thus pushing it to the side were the ram is. Please explain how this is wrong?
Community Comments (5)
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dimky Posts: 513 14.05.2012 / 10:23
The non-ram side has a greater area, so the ram will be pushed from that side to the ram side.
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chevychase Posts: 5 14.05.2012 / 11:25
Exactly so answer 3 • the ram will move to the side where the ram is, due to pressure acting on differential areas. Is the correct one.
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dimky Posts: 513 15.05.2012 / 13:24
Sure, question corrected. :) Thanks.
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sepehr Posts: 1 12.10.2015 / 00:18
Answer is 2. The force is equal in both sides.but the pressure in ram side is more than opposite side, because the area in opposite side is bigger than ram side. According to P=F/A the ram will move to opposite to the side where the ram is due to higher pressure in ram side. Thanks
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dimky Posts: 513 12.10.2015 / 01:25
No, sepehr, you are not correct.
Why pressure should be different if it is applied in the same time from one source to both sides of piston? Force will be not equal as per formula you provided and this is the reason why piston will move to ram side.
Why pressure should be different if it is applied in the same time from one source to both sides of piston? Force will be not equal as per formula you provided and this is the reason why piston will move to ram side.
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