1. Akumulator
Fungsi utama adalah mengambil
sejumlah fluida bertekanan dari
sistem hidrolik dan
menyimpannya hingga diperlukan
oleh sistem kembali

2. Type-type Akumulator
1. Akumulator Bladder
2. Akumulator Membran
3. Akumulator Piston

3. Simbol Akumulator
P T
MS

4. Akumulator Bladder

5. Akumulator Membran

6. Akumulator Piston

7. Parameter Pengoperasian Akumulator
p0 = Gas pre-fill presure
p1 = Minimum operating pressure
p2 = Maximum operating pressure
V0 = Effective gas volume
V1 = Gas volume at p1
V2 = Gas volume at p2
ΔV = Useful volume
ΔV = V1 – V2

8. Pengisian Gas Nitrogen Ideal
Bladder Accumulator
Membrane
Accumulator Piston
Membrane
Low friction
model
High
Pressure
Low
Pressure
Welded
Model
Screwed
Model
Gas fill
pressure
p0
≤ 0,9. P1(energy storage)
= 0,6 to 0,9 . Pm (Shock
absorption)
= 0,6 . Pm (Pulsation damping)
≤ 0,9 . P1 (Energy storage)
= 0,6 . Pm (Pulsation
damping)
≤ P1 – 5 bar
< 2 bar (Low friction
piston model)
< 10 bar (Normal
piston model)
Max Pressure
ratio p2/p0
4 : 1 4 : 1
4 : 1 to
8 : 1
10 : 1 No limitations
Max. operating
pressure
550 bar 35 bar 210 bar 400 bar 350 bar
Fluid flow
Up to 40
L/s
Up to 140 L/s 4 to 6 L/s 4 to 6 L/s
Dependent on piston
diameteris the max
velocity 3,5 m/s
Accumulator Up to 50 L Up to 450 L Up to 3,5 L
Up to 10
L/s
Up to 250 L/s
Pm = mean operating pressure t free flow
Pressure : always absolute pressure