Akumulator

Fungsi utama adalah mengambil sejumlah fluida bertekanan dari

sistem hidrolik dan menyimpannya hingga diperlukan

oleh sistem kembali

Type-type Akumulator

1. Akumulator Bladder

2. Akumulator Membran

3. Akumulator Piston

Simbol Akumulator

P T

MS

Akumulator Bladder

Akumulator Membran

Akumulator Piston

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

Pengisian Gas Nitrogen Ideal

Bladder AccumulatorMembrane

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 : 14 : 1 to

8 : 110 : 1 No limitations

Max. operating

pressure550 bar 35 bar 210 bar 400 bar 350 bar

Fluid flowUp to 40 L/s

Up to 140 L/s 4 to 6 L/s 4 to 6 L/sDependent on piston diameteris the max velocity 3,5 m/s

Accumulator Up to 50 L Up to 450 L Up to 3,5 LUp to 10 L/s

Up to 250 L/s

Pm = mean operating pressure t free flowPressure : always absolute pressure