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The biggest difference between piston type and bladder type accumulators

Pistons and bladder type accumulators are two common devices used in hydraulic systems to store hydraulic energy. The biggest difference between them lies in their working principle and structural form.

Piston accumulator:

Working principle: The piston accumulator compresses the piston into a closed container through hydraulic oil to store energy. When hydraulic oil is pressed into the accumulator, the piston is compressed by pressure, storing energy in the compressed gas or spring.
Structural form: A piston accumulator typically consists of a container, a piston, and a spring or air cushion. When compressing hydraulic oil, the piston moves and stores energy in the spring or air cushion.
Bag type accumulator:

Working principle: The bladder type accumulator uses a soft rubber or elastic material membrane to store hydraulic energy. When hydraulic oil is pressed into the accumulator, the capsule will expand and store energy inside the capsule.
Structural form: The bladder type accumulator consists of a container and a soft membrane capsule. When hydraulic oil is pressed into the container, the capsule will expand and store hydraulic energy.
The main difference is that piston type accumulators use pistons to compress gas or springs to store energy, while bladder type accumulators use soft capsules to store energy. This leads to differences in structure, capacity, and application. Piston type accumulators are usually more suitable for high-pressure and small capacity applications, while bladder type accumulators are more suitable for large capacity and low pressure applications.

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