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Root Causes of Diaphragm Failure in Diaphragm Accumulators

Diaphragm accumulators are essential components in hydraulic systems, storing energy in the form of pressurized fluid and helping to maintain system pressure, compensate for leaks, and reduce pressure spikes. However, diaphragm failure can lead to significant system malfunctions. Understanding the root causes of diaphragm failure is crucial for maintaining efficient and reliable operation. Here are some common root causes:

1. Over-Pressurization

Description: Exceeding the maximum allowable pressure of the accumulator can cause the diaphragm to stretch beyond its elastic limit, leading to permanent deformation or rupture.

Prevention: Install pressure relief valves and regularly monitor system pressure to ensure it stays within safe operating limits.

2. Chemical Incompatibility

Description: Exposure to hydraulic fluids or other chemicals that are incompatible with the diaphragm material can cause degradation, swelling, or cracking.

Prevention: Use diaphragms made from materials that are compatible with the fluids in the system and regularly check for any signs of chemical degradation.

3. Temperature Extremes

Description: Operating the accumulator in temperatures outside the diaphragm material’s specified range can cause the diaphragm to become brittle (in cold conditions) or soft and weak (in hot conditions).

Prevention: Ensure the operating temperature stays within the recommended range for the diaphragm material, and use accumulators designed for extreme temperatures if necessary.

4. Mechanical Damage

Description: Physical damage during installation, maintenance, or operation can lead to tears, punctures, or other forms of mechanical failure.

Prevention: Handle the diaphragm with care during installation and maintenance. Avoid using sharp tools that could damage the diaphragm.

5. Cyclic Fatigue

Description: Repeated cycling of the accumulator (filling and emptying) can cause the diaphragm to wear out over time, leading to fatigue failure.

Prevention: Use diaphragms made from durable materials designed for high cycle applications and regularly inspect the diaphragm for signs of wear and tear.

6. Contamination

Description: Contaminants in the hydraulic fluid, such as dirt, metal particles, or other debris, can cause abrasion and wear on the diaphragm.

Prevention: Keep the hydraulic system clean, regularly change filters, and ensure that the hydraulic fluid is free from contaminants.

7. Improper Pre-Charge Pressure

Description: Incorrect pre-charge pressure can cause the diaphragm to operate outside its optimal range, leading to stress and eventual failure.

Prevention: Regularly check and adjust the pre-charge pressure to ensure it matches the manufacturer’s specifications.

8. Poor Installation Practices

Description: Incorrect installation procedures, such as improper alignment or torque, can cause undue stress on the diaphragm.

Prevention: Follow the manufacturer’s installation guidelines carefully and use appropriate tools and techniques to ensure proper installation.

9. Aging and Material Degradation

Description: Over time, the diaphragm material can degrade due to aging, losing its elasticity and strength.

Prevention: Regularly inspect and replace the diaphragm according to the manufacturer’s recommended maintenance schedule, even if no visible damage is present.


Addressing the root causes of diaphragm failure in diaphragm accumulators involves careful monitoring, regular maintenance, and adherence to manufacturer guidelines. By understanding and mitigating these causes, you can enhance the reliability and lifespan of your hydraulic systems.



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