Differential Accumulator


Differential Accumulator


"It’s a device in which the liquid is stored at a high pressure by a comparatively small load on the ram."

 Parts of Differential Accumulator

1. Fixed Vertical Cylinder
2. Inverted Moving Cylinder
3. Weight
4. Brass Bush
5. Inlet pump
6. Pipes

Construction of Differential Accumulator

It’s consists of a fixed vertical cylinder of small diameter. The fixed vertical cylinder is surrounded by closely fitting brass bush, which is surrounded by an inverted moving cylinder, having circular projected collar at the base on which weights are placed.

Working of Differential Accumulator

The liquid from the pump is supplied to the fixed vertical cylinder. The liquid move up through the small diameter of fixed vertical cylinder & then enter the inverted cylinder. The water exerts an upward pressure force on the internal annular area of the inverted moving cylinder, which is loaded at the base. The internal annular area of the inverted moving cylinder is equal to the sectional area of the brass bush. When the inverted moving cylinder moving up, the hydraulic energy stored in the accumulator.
Let 

p= Intensity of the pressure of liquid supplied by pump
A = Area of brass bush
L= Vertical lift of moving cylinder
W= Total weight placed on the moving cylinder including the weight of cylinder

W = p × a

The p = W/a ……………………………(1)

From Equation (1) it’s clear that pressure intensity can be increased with small load W, by making small area ‘a’.

Now total energy stored in the accumulator = Total Weight × Vertical Lift

= W × L Newton-metre

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