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.
Explanation from PART66Online
With fluid at equal pressure on both faces, force equals pressure times area, so the side without the rod (full piston area) develops more force than the rod side (annular, smaller area). The net force therefore pushes the piston toward the rod side, so the ram moves to the side where the ram emerges.
chevychase asked · 12 May 2012
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)
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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