KCPA SAMPLE Hydraulic SYSTEMS. Tom Korder email@example.com. Roméo et Juliette RAMP. Two – One –, rated up to 5 GPM One – One – . Roméo et Juliette RAMP. Ramp cylinders. Roméo et Juliette RAMP. Ramp cylinders. Roméo et Juliette RAMP.
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SAMPLE Hydraulic SYSTEMS
Hydraulics viewed from under ramp in trap room
Slipstage in “out” position
2000 lbs of force
6000 lbs of force
Force (lb.) = pressure (lb sq in) x area (sq in)
2” bore x ?? psisystem pressure
F / A = P
242 x .7854 = 452 sq. in.
220 lb. / 452 sq. in. =
1442 x .7854 = 16286 sq. in.
.48 psi x 16286 sq. in. =
7817 lb. of force
To Find Needed GPM
time for stroke
time for stroke
Flow (gal./min.) = (area (sq in) x stroke length (in) x .26) / time for stroke (sec)
2” bore x 36” stroke cylinder ; 30 seconds, 15 seconds, 10 seconds
Speed =___flow x 231_____
DCV(Directional Control Valve)
Other control devices
Power unit (pump)
an obstruction, overload, or added friction will stall the system until you fixed the problem
(following this slide are new slides that address these topics, these were not included in original workshop presentation)
Left side of DCV is activated, cylinder will make its 'OUT-stroke‘, oil flows through integrated check valve.
To lower cylinder, the right side of DCV is activated. From that moment on pressure is built up at the rod side of the cylinder. This pressure opens the balance valve & the oil at the bottom side of the cylinder flows through the balance valve & DCV back to reservoir.
To lower cylinder, the right side of DCV is activated. From that moment on pressure is built up at the rod side of the cylinder. This pressure opens the balance valve
The oil at the bottom side of the cylinder flows through the balance valve & DCV back to reservoir
As the load helps lowering the cylinder, the cylinder might go down faster than the oil is applied to the rod side of the cylinder (the cylinder isn't under control at that moment).
However, the pressure at the rod side of the cylinder and therefore the pilot pressure on the balance valve will decrease and the spring moves the balance valve to the direction 'close' as long as it finds a new 'balance'. .
Notes available at
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