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The difference between piston type accumulator and diaphragm type accumulator

The piston-type accumulator and diaphragm-type accumulator are two common types of hydraulic accumulators, each with its own unique characteristics. Here are the main differences between them:

Internal Structure:

Piston-Type Accumulator: This type of accumulator consists of a cylinder with a movable piston inside. The piston separates the gas or fluid on one side from the hydraulic fluid on the other side. When fluid or gas is pumped into the accumulator, it compresses the gas or fluid on the opposite side of the piston, storing energy.

Diaphragm-Type Accumulator: In contrast, a diaphragm-type accumulator uses a flexible diaphragm to separate the gas or fluid from the hydraulic fluid. The diaphragm expands or contracts as the gas or fluid enters or exits the accumulator, storing or releasing energy, respectively.

Working Principle:

Piston-Type Accumulator: The working principle of a piston-type accumulator involves the movement of the piston in response to the compression or expansion of the gas or fluid. When pressure is applied, the piston compresses the gas or fluid, storing energy. Conversely, when pressure is released, the piston moves, allowing the stored energy to be released.

Diaphragm-Type Accumulator: In a diaphragm-type accumulator, the flexible diaphragm expands or contracts to accommodate changes in volume due to the compression or expansion of the gas or fluid. As pressure increases, the diaphragm expands, storing energy. When pressure decreases, the diaphragm contracts, releasing the stored energy.


Piston-Type Accumulator: Due to its design, the piston-type accumulator is often used in high-pressure and high-flow applications where rapid energy storage and release are required. It is commonly found in hydraulic systems for heavy machinery, presses, and hydraulic cranes.

Diaphragm-Type Accumulator: Diaphragm-type accumulators are suitable for applications where there is a need for a compact design, high pressure containment, or compatibility with a wide range of fluids. They are commonly used in hydraulic systems for industrial machinery, automotive systems, and fluid power applications.

Pressure Rating:

Piston-Type Accumulator: Typically, piston-type accumulators can handle higher pressures compared to diaphragm-type accumulators due to the robustness of their design and materials.

Diaphragm-Type Accumulator: While diaphragm-type accumulators may have lower pressure ratings compared to piston-type accumulators, they offer advantages in terms of flexibility, compatibility with various fluids, and ease of maintenance.

In summary, the main differences between piston-type and diaphragm-type accumulators lie in their internal structure, working principle, applications, and pressure ratings. The choice between them depends on specific system requirements, including pressure levels, flow rates, space constraints, and fluid compatibility.



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