Introduction
This instruction manual provides essential information for the proper use, installation, and maintenance of your Bellababy Breast Pump Membrane Replacement Kit. These silicone membranes and duckbill valves are crucial for maintaining optimal suction and hygiene of your breast pump, ensuring efficient milk expression. This kit is designed for Bellababy breast pumps, excluding models BLA8038 and BLA8039.
Product Overview
The Bellababy Breast Pump Membrane Replacement Kit includes essential silicone components that wear out over time and require periodic replacement. These parts are vital for creating the necessary vacuum for effective milk expression.

The kit typically contains:
- Silicone Diaphragms: These flexible, circular membranes create a sealed chamber for suction.
- Duckbill Valves: These one-way valves control milk flow, preventing backflow and ensuring efficient collection.
Installation Guide
To ensure proper function and hygiene, replace your breast pump membranes and duckbill valves regularly. Follow these steps for installation:
- Disassembly: Carefully detach the existing diaphragm and duckbill valve from your breast pump's collection cup or connector.
- Cleaning: Before installing new parts, ensure all pump components are thoroughly cleaned and sterilized according to your breast pump's original instructions.
- Diaphragm Installation: Place the new silicone diaphragm securely onto its designated slot on the pump body or collection cup. Ensure it forms a tight seal around the edges.
- Duckbill Valve Installation: Gently push the new duckbill valve onto the valve stem until it is firmly seated. The flat end of the duckbill should point downwards, allowing milk to flow out but not back in.
- Reassembly: Reassemble the rest of your breast pump components as per your pump's user manual.
A tight seal is critical for effective suction. If you experience reduced suction after replacement, recheck the installation of both the diaphragm and duckbill valve.
This video demonstrates the ease of use and assembly of compatible breast pump parts, highlighting how new components can improve pumping efficiency.
Watch this video for a visual guide on replacing breast pump parts, including diaphragms and duckbill valves, to maintain optimal pump performance.
Operating
Once installed, the new membranes and valves will restore optimal suction to your breast pump. The diaphragm works with the pump motor to create a vacuum, while the duckbill valve ensures milk flows efficiently into the collection bottle without leaking or backflow. Regular replacement ensures consistent and effective pumping sessions.
Maintenance and Cleaning
To maintain hygiene and prolong the life of your replacement parts, clean them after each use:
- Disassemble: Separate the membranes and valves from other pump components.
- Wash: Wash all parts with warm soapy water. Use a soft brush if necessary to clean crevices.
- Rinse: Rinse thoroughly under clean running water.
- Sterilize: Sterilize parts by boiling for 5 minutes, using a steam sterilizer, or following your preferred sterilization method.
- Dry: Allow parts to air dry completely on a clean surface or drying rack before storage.
Replacement Frequency: It is recommended to replace silicone diaphragms and duckbill valves every 2-3 months, or sooner if you notice signs of wear, tearing, or decreased pump performance (e.g., reduced suction).
Troubleshooting
If you experience issues after replacing your membranes and valves, consider the following:
- Reduced Suction:
- Check that the silicone diaphragm is seated correctly and forms a complete seal.
- Ensure the duckbill valve is firmly attached and not torn or damaged.
- Verify that no other pump parts are damaged or incorrectly assembled.
- Milk Leakage:
- Confirm the duckbill valve is properly installed and not obstructed.
- Check for any tears or damage in the diaphragm or valve that could compromise the seal.
If problems persist, consult your breast pump's main user manual or contact Bellababy customer support.
Product Specifications
- Material: Silicone
- Compatibility: Designed for Bellababy Breast Pumps (Except Models BLA8038/BLA8039). Compatible with models such as M5, S9 Pro, S12 Pro, and S32.
Important Safety Information
Statements regarding dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease or health condition. Always consult with a healthcare professional regarding any medical concerns or before making changes to your breastfeeding or pumping routine.
Customer Support
For further assistance, questions, or concerns regarding your Bellababy Breast Pump Membrane Replacement Kit, please refer to the contact information provided with your original breast pump or visit the official Bellababy website for support resources.