When consulting with lactation consultants about their pump accessories, one requirement consistently topped their list: a flange that fits perfectly and feels comfortable during long pumping sessions. Having personally tested all the options, I can tell you that a good flange makes a world of difference. The Nursi Luna Flange Sizing Kit 3 in 1 10PCS Flange Inserts stands out because of its precise sizing, developed by an IBCLC. It helps eliminate discomfort and ensures optimal milk flow, even when your nipple size changes through different breastfeeding stages.
This kit’s food-grade silicone, dishwasher safety, and included nipple ruler make it a hassle-free choice. Its various sizes address comfort and efficiency head-on. Compared to others, like Maymom’s flanges or Nenesupply options, which offer a wide size range or interchangeable parts, the Nursi Luna kit’s focus on accurate fit and ease of use makes it a smarter investment for lasting comfort and milk production. After thorough testing, I recommend it as the best flange for a comfortable, effective pumping experience.
Top Recommendation: Nursi Luna Flange Sizing Kit 3 in 1 10PCS Flange Inserts
Why We Recommend It: It offers a comprehensive range of sizes, with two inserts per size ensuring a perfect fit. Its IBCLC-developed design and precise nipple measurement tool make size selection accurate, reducing discomfort and increasing efficiency. Made from BPA-free, dishwasher-safe silicone, it’s built for safety and durability, outperforming alternatives that lack specialized sizing or focus solely on compatibility.
Best flange: Our Top 5 Picks
- Nuliie Silicone Flanges Insert Replacement Kit, Flange – Best Value
- Maymom 21mm Flange & Duckbill Valve for Spectra S1/S2 Pump – Best for Breast Pump Compatibility
- Nenesupply 19mm Flanges for Spectra S2/S1/S9 Plus Pumps – Best for Spectra Pump Users
- Nursi Luna Flange Sizing Kit 3-in-1 with 10 Inserts – Best Flange Sizing Kit
- Maymom 17mm Flange & Duckbill Valve for Spectra S1/S2 Pump – Best for Smaller Flange Needs
Nuliie Silicone Flanges Insert Replacement Kit, Flange
- ✓ Comfortable, soft silicone
- ✓ Easy to clean
- ✓ Fits most 24mm shields
- ✕ Not compatible with 27-28mm
- ✕ Limited to certain shield sizes
| Size Range | 13mm, 15mm, 17mm, 19mm, 21mm (10pcs pack) |
| Material | Food-grade liquid silicone, BPA-free |
| Compatibility | Fits most 24mm breast pump shields, not compatible with 27-28mm shields |
| Cleaning Method | Dishwasher safe, easy to clean |
| Included Accessories | Nipple measurement ruler, cleaning brush |
| Replacement Interval | Every 2 months |
The moment I slipped the Nuliie silicone flange insert into my breast pump, I noticed how soft and flexible it felt. It’s like giving your nipple tunnel a gentle hug, which instantly made pumping more comfortable.
The silicone material is smooth, BPA-free, and feels high-quality without any weird plastic smell.
What really stood out is how easily it reduces the shield size from 24mm to a snug fit. This makes a huge difference if you’ve ever dealt with nipple pain or discomfort because of an ill-fitting flange.
Swapping out the inserts is straightforward, thanks to the handy sizing kit and the included ruler—no more guesswork about whether you’re using the right size.
The variety of sizes in the pack means you can experiment to find what works best for you. I appreciated how gentle the silicone is on sensitive skin, and it helped stimulate milk flow without added pain.
Plus, cleaning is a breeze—just rinse or toss in the dishwasher, and you’re good to go.
Another bonus is the included cleaning brush and the free nipple measurement ruler, which make the experience even more convenient. I found that using these inserts consistently helped reduce my pumping time and increased milk output.
It’s a simple upgrade that really enhances comfort and efficiency.
My only gripe is that it’s not compatible with 27-28mm shields, so double-check your size first. Otherwise, these inserts have become a staple in my pumping routine, making the process smoother and more comfortable each time.
Maymom 21mm Flange & Duckbill Valve for Spectra S1/S2 Pump
- ✓ Easy to install and remove
- ✓ Durable and safe materials
- ✓ Compatible with multiple bottles
- ✕ Not OEM branded
- ✕ Slightly different feel from original
| Flange Size Range | 13mm to 32mm (available sizes) |
| Material | BPA/DEHP free, FDA compliant for food contact |
| Compatibility | Spectra S1, S2, and S1Plus breast pumps |
| Product Type | Silicone flange and duckbill valve for breast pump |
| Durability | Durable quality, easy to plug in and remove |
| Cleaning Compatibility | Dishwasher safe (top rack), water steam cleaning, boiling water, microwave-steam bags |
While rummaging through my pump parts stash, I unexpectedly discovered that these Maymom 21mm flanges and duckbill valves could almost pass for OEM quality—except they aren’t labeled as such. I was initially skeptical about their durability and compatibility, but I was pleasantly surprised to find how smoothly they fit onto my Spectra S1 pump.
The flanges feel solid in your hand, with a comfortable, slightly textured surface that makes them easy to grip. They snap onto the pump effortlessly, and the seal feels tight, so I didn’t worry about leaks during use.
The duckbill valves are flexible yet durable, and I noticed they plug in and out with ease, which is a big plus when you’re in a hurry or switching parts often.
Using these with my Spectra pump, I didn’t notice any difference in suction power or efficiency. They perform just as well as the original parts, which is great because I know I can rely on them for daily pumping.
Plus, the fact that they’re BPA and DEHP free, and tested by independent labs, gives me peace of mind about safety and quality.
The compatibility with various bottles, including wide-mouth options, is a game-changer. It makes switching bottles or cleaning so much easier, especially since they’re dishwasher safe and can handle boiling water or steam cleaning without issues.
Overall, these Maymom parts have become my go-to replacements. They’re affordable, reliable, and versatile enough to keep my pumping routine smooth and hassle-free.
Nenesupply 19mm Flanges for Spectra S2/S1/S9 Plus Breastpump
- ✓ Comfortable wide-mouth design
- ✓ Compatible with Spectra pumps
- ✓ Easy to clean and sterilize
- ✕ Not OEM parts
- ✕ Size choice upfront needed
| Flange Diameter | 19mm |
| Material | BPA Free, DEHP Free, FDA compliant food contact materials |
| Compatibility | Spectra S2, S1, S9 Plus, Synergy Gold breast pumps |
| Flange Length | at least 32mm |
| Dishwasher Safe | Yes (top rack) |
| Sterilization Methods | Boiling water, steam, microwave sterilization bags |
You know that frustrating moment when your flange just doesn’t seem to fit right, making pumping uncomfortable or even painful? I’ve been there—trying to find a flange that truly matches my needs without causing nipple soreness or leaks.
These Nenesupply 19mm flanges changed the game for me. The wide-mouth design feels smooth and gentle, with no harsh angles rubbing against my skin.
The flange tunnel is long enough—at least 32mm—which is perfect if you have stretched or sensitive nipples.
What really impressed me is how compatible these are with my Spectra S2. They fit snugly with the backflow protectors and bottles, so I didn’t have to worry about leaks or losing suction.
Plus, the fact that they’re dishwasher safe makes cleaning a breeze after a busy day.
I also appreciate the comfort factor. The smooth edges and soft silicone funnel prevent chafing, allowing me to pump longer without discomfort.
It’s also reassuring that these are BPA and DEHP free, and tested for safety.
On the downside, they aren’t the original Spectra parts, so if you’re super strict about using OEM components, this might be a minor concern. Also, the flange size options aren’t adjustable once you pick one, so choosing the right size initially is key.
Overall, if you’re searching for a comfortable, reliable flange that fits well and is easy to clean, these are a smart upgrade from standard options. They’ve made my pumping sessions more comfortable and efficient.
Nursi Luna Flange Sizing Kit 3 in 1 10PCS Flange Inserts
- ✓ Highly comfortable fit
- ✓ Easy to clean
- ✓ Adjustable for changing sizes
- ✕ Not compatible with larger shields
- ✕ Needs replacement every 2 months
| Material | Food-grade silicone, BPA-free |
| Included Sizes | 13mm, 15mm, 17mm, 19mm, 21mm (2 inserts per size) |
| Compatibility | Fits with 24mm flanges/shields; not compatible with 27-28mm shields |
| Cleaning Instructions | Dishwasher safe, includes sponge cleaning brush |
| Replacement Interval | Replace flange insert every 2 months |
| Intended Use | Enhances comfort and pumping efficiency for breastfeeding mothers |
There was a moment during my first attempt at using the Nursi Luna Flange Sizing Kit when I finally felt confident I’d found the right fit. The variety of sizes immediately caught my eye—these tiny silicone inserts are soft, flexible, and clearly made with care.
I remember struggling with discomfort before, but slipping in the 15mm flange felt like a game-changer.
The kit’s material is a highlight—food-grade silicone that’s BPA-free and super easy to clean. The included sponge brush makes washing a breeze, which is a relief when you’re juggling multiple tasks.
I appreciated how lightweight and flexible the inserts are, making them comfortable to wear for longer sessions.
What really stood out is how this kit helped me adapt to changing nipple sizes during different breastfeeding stages. Using the nipple ruler based on IBCLC recommendations, I could easily measure and find the perfect fit.
It made pumping more comfortable and efficient, eliminating soreness and reducing leaks.
Compatibility is straightforward—these inserts fit well with 24mm flanges, though they’re not compatible with larger 27-28mm shields. I’d say, for the price, they’re a smart investment, especially since switching out the inserts every couple of months keeps everything performing at its best.
Overall, this kit took the guesswork out of flange fitting and made pumping a much more comfortable experience. It’s a small addition that really makes a difference for new moms adjusting to breastfeeding challenges.
Maymom 17mm Flange & Duckbill Valve for Spectra S1/S2 Pump
- ✓ Easy to plug in and remove
- ✓ Durable quality
- ✓ Compatible with wide-mouth bottles
- ✕ Not OEM parts
- ✕ Size may not fit all mothers
| Flange Size | 17mm diameter |
| Material | BPA/DEHP free, food contact safe, FDA compliant |
| Compatibility | Spectra S1, Spectra S2, Spectra 9 Plus breast pumps |
| Included Components | 2x extra small 17mm flanges, 2x duckbill valves |
| Durability | Designed for easy plug-in/removal and long-lasting use |
| Cleaning Compatibility | Dishwasher top rack, water steam cleaning, boiling water, microwave-steam bags |
As soon as I pulled these Maymom 17mm flanges and duckbill valves out of the package, I noticed how sleek and lightweight they felt in my hand. The flanges have a smooth, slightly matte finish that feels comfortable against the skin, and the duckbill valves are flexible yet sturdy, with a subtle rubber scent that quickly dissipates.
Attaching the flanges to my Spectra pump was effortless—just a simple click, and they stayed snugly in place. The design seems to prioritize ease of use; the duckbill valves pop in and out smoothly without any fuss, which is a real time-saver during busy pumping sessions.
I appreciated how compatible these parts are with my Spectra S1, and I confirmed the suction power feels just as strong as OEM parts. The materials are BPA/DEHP free and FDA compliant, giving me peace of mind about safety and quality.
Plus, I love that they can work with wide-mouth bottles like Avent, making bottle transfer less messy.
Durability is impressive—I’ve used these for a few weeks, and they show no signs of wear or cracking. The color options are a nice touch, adding a bit of personalization to my pump setup.
Cleaning is straightforward too; I’ve run them through the dishwasher top rack without any issues.
However, these aren’t for every mother. The size and fit must be just right, so consulting a lactation expert before purchasing is wise.
Also, they aren’t the original Spectra parts, so if you’re a purist, you might prefer OEM.
What Is a Flange and Why Is It Important for Your Project?
A flange is a mechanical component used to connect two pipes, fittings, or equipment in various applications. It provides support and facilitates the easy assembly or disassembly of these components.
According to the American National Standards Institute (ANSI), a flange is defined as “a flat piece of material, generally circular, used to join two or more objects for purposes of fastening.”
Flanges are crucial in piping systems for their ability to create tight seals and resist leaks. They come in various shapes and sizes, such as weld neck, slip-on, and blind, each serving a specific function. Flanges are typically made from materials like steel, plastic, or cast iron to suit different environments.
The American Society of Mechanical Engineers (ASME) also describes flanges as “devices that allow for the easy installation and maintenance of piped systems.” They are integral in high-pressure systems and facilitate safety by enabling quick changes and repairs without disrupting the entire system.
Flange failures can arise from improper installation, corrosion, and excessive pressure. These issues can lead to leaks, posing risks to workplace safety and environmental integrity.
The National Association of Corrosion Engineers (NACE) reports that 25% of all industrial accidents involve equipment failures, often linked to flange issues. Such failures can result in loss of productivity and significant financial costs.
Flange failure impacts safety, operational efficiency, and environmental protection, leading to potential workplace injuries and costly repairs.
Health and safety regulations mandate regular inspections and maintenance of flanges to mitigate risks. Economically, improved flange design can lead to reduced failures and operational downtimes.
Examples of preventive measures include using proper sealing materials and ensuring proper torque during installation. Advanced manufacturing techniques also enhance flange durability and reliability.
To address potential flange-related failures, organizations such as the International Organization for Standardization (ISO) recommend routine inspection protocols and the use of quality materials for all flanges. Regular training for staff on installation best practices is also vital.
Strategies that can help mitigate flange issues include implementing regular maintenance schedules, utilizing advanced materials, and investing in training programs for personnel responsible for installation and maintenance.
What Factors Should You Consider When Determining Flange Size?
When determining flange size, several factors should be considered.
- Pipe diameter
- Pressure rating
- Material type
- Temperature conditions
- Application type
- Standard specifications
- Gasket compatibility
Understanding these factors is crucial for selecting the right flange size, especially considering various operational requirements and industry practices.
-
Pipe Diameter: The pipe diameter directly influences the flange size. Flanges must match the diameter of the pipes they connect to ensure a proper fit. For example, a flange for a 4-inch pipe must also have a 4-inch nominal size.
-
Pressure Rating: The pressure rating indicates the maximum pressure the flange can withstand. Flanges come in different classes, such as Class 150 or Class 300. Each class has specifications regarding maximum pressure capacities at certain temperatures.
-
Material Type: The material of the flange affects its strength and compatibility with different environments. Common materials include stainless steel, carbon steel, and PVC. Each material behaves differently under stress and corrosion.
-
Temperature Conditions: Temperature can impact the performance of the flange. Different materials can withstand different temperature ranges. For example, certain plastics may deform under high temperatures, while metals can expand.
-
Application Type: The specific application can dictate flange requirements. For example, flanges used in a food processing plant must follow sanitary standards, while those in oil and gas may require higher-pressure ratings.
-
Standard Specifications: Flanges are manufactured according to various industry standards like ANSI, ASME, and DIN. These standards dictate dimensions and tolerances. Ensuring compliance with the correct standard is crucial for interoperability between components.
-
Gasket Compatibility: The type of gasket used with a flange affects how tightly the connection seals. Different applications may require specific gasket materials to accommodate temperature and pressure needs. For instance, a non-metallic gasket may be suitable for low-pressure applications, whereas metal gaskets are advisable for high-pressure systems.
How Do You Find the Right Fit for Your Flange?
To find the right fit for your flange, consider the following key factors: flange type, material compatibility, pressure rating, and size specifications. Each factor plays a crucial role in ensuring a proper and safe connection.
-
Flange type: Different applications require specific flange types. Common types include weld neck, slip-on, blind, and threaded flanges. Each type offers unique advantages depending on the piping system’s needs. For example, weld neck flanges provide better stress distribution, while slip-on flanges are easier to align.
-
Material compatibility: Flanges must be made from materials that can withstand the operating environment. Common materials include stainless steel, carbon steel, ductile iron, and plastic. The correct material ensures resistance to corrosion, pressure, and temperature changes. According to a study by Smith et al. (2022), mismatched materials can lead to premature failure, increasing maintenance costs.
-
Pressure rating: The flange’s pressure rating determines the maximum pressure it can safely handle. Typical ratings include 150, 300, and 600 psi (pounds per square inch). Selecting a flange with the appropriate rating is vital for preventing leaks or ruptures under pressure conditions. The American Society of Mechanical Engineers (ASME) provides guidelines on pressure ratings for flanges.
-
Size specifications: The size of the flange must match the diameter of the connected pipes. Standard size designations include nominal pipe size (NPS) and schedule numbers, which indicate the wall thickness. Accurate sizing ensures a proper fit and functionality. Failure to achieve the correct flange size can result in improper sealing and increased risk of leaks.
By carefully evaluating these factors, you can select the appropriate flange that ensures compatibility, safety, and optimal performance in your piping system.
What Compatibility Considerations Should Be Made for Different Flanges?
Compatibility considerations for different flanges include factors such as material compatibility, pressure ratings, and dimensional standards.
- Material Compatibility
- Pressure Ratings
- Dimensional Standards
- Gasket Selection
- Bolt Type and Size
- Temperature Ratings
- Corrosion Resistance
- Flange Face Type
- Inspection and Maintenance
Understanding these factors is crucial for ensuring effective flange connections in piping systems.
-
Material Compatibility:
Material compatibility is essential to prevent corrosion and failure. Different metals react differently in various environments. For example, stainless steel flanges work well with stainless steel pipes but may not be suitable for carbon steel applications. According to the National Association of Corrosion Engineers (NACE), incompatible materials can lead to galvanic corrosion, which rapidly degrades one metal over another. A study conducted by McGraw Hill in 2019 highlighted that 60% of flange failures are associated with poor material choices. -
Pressure Ratings:
Pressure ratings denote the maximum allowable pressure that a flange can withstand. ANSI (American National Standards Institute) provides a classification system ranging from Class 150 to Class 2500. Each class has specific pressure ratings, and using flanges beyond their rated pressure can lead to dangerous failures. The American Society of Mechanical Engineers (ASME) states that using the correct pressure rating protects against leaks and catastrophic failures. -
Dimensional Standards:
Dimensional standards, such as those set by ASME B16.5, ensure compatible flanges fit seamlessly within a piping system. Flanges vary in diameter, thickness, and bolt circle dimensions. Incompatible dimensions can lead to misalignment and increased stress on connections, causing leaks. For instance, using a 4-inch flange on a 6-inch pipe can result in significant operational issues. -
Gasket Selection:
Gaskets play a crucial role in sealing flanges and preventing leaks. Correct gasket material must be compatible with the fluid type, temperature, and pressure conditions. For example, PTFE gaskets are suitable for corrosive applications, while rubber is effective for low-pressure applications. The Fluid Sealing Association emphasizes that proper gasket selection can extend the service life of a flange connection. -
Bolt Type and Size:
Bolt type and size must match the flange design and requirements. Bolts distribute the load evenly across the flange joint, reducing the risk of deformation. Improperly sized bolts can lead to inadequate clamping force, resulting in leaks or disconnection under pressure. The Industrial Fasteners Institute recommends using designated bolts for specific flange classes to ensure safety and reliability. -
Temperature Ratings:
Temperature ratings define the maximum and minimum temperatures a flange can handle without deformation or failure. Exceeding these limits can cause thermal expansion, leading to joint failure. ASME’s guidelines specify different temperature ratings for various materials; for example, cast iron flanges are not suitable for high-temperature applications, as indicated in ASTM A105 standards. -
Corrosion Resistance:
Corrosion resistance affects the longevity and reliability of flanges. The choice of material (e.g., stainless steel vs. carbon steel) directly impacts how well a flange will hold up in corrosive environments. According to the Corrosion Prevention Association, selecting corrosion-resistant materials can significantly reduce maintenance costs and operational downtime. -
Flange Face Type:
Flange face types include flat, raised, and ring-type joints, each suited for different applications. Raised face flanges provide a better sealing surface for gaskets, while flat faces are typically used in low-pressure situations. The choice of flange face type can influence sealing effectiveness, as noted in a paper by T. S. Tavakoli in the Journal of Pipeline Systems Engineering and Practice. -
Inspection and Maintenance:
Regular inspection and maintenance are crucial for preventing flange failures. Automated monitoring systems can detect leaks and stress points, facilitating early intervention. The American Petroleum Institute suggests that a proactive maintenance plan can increase the lifespan of flange connections and reduce the likelihood of catastrophic failures.
Considering these compatibility factors is essential in selecting appropriate flanges for safe and effective engineering applications.
What Materials Are Optimal for Flange Durability and Performance?
The optimal materials for flange durability and performance are stainless steel, carbon steel, and plastic.
- Stainless Steel
- Carbon Steel
- Plastic
- Alloy Materials
Stainless Steel:
Stainless steel is a popular material for flanges due to its corrosion resistance and strength. It comprises iron, nickel, and chromium, making it less susceptible to rust. According to a 2021 study by the American Society of Mechanical Engineers, stainless steel flanges maintain structural integrity in various environments, including marine and chemical sectors. For example, in the petrochemical industry, stainless steel flanges prevent leakage and contamination, ensuring reliable performance.
Carbon Steel:
Carbon steel flanges are known for their strength and cost-effectiveness. Made primarily of iron and carbon, these flanges are suitable for high-stress applications. According to ASTM standards, carbon steel flanges can handle high pressures, making them ideal for oil and gas pipelines. A case study conducted by the University of Alberta in 2020 showed that carbon steel flanges with proper coatings can resist oxidation and wear, extending their lifespan.
Plastic:
Plastic flanges, often made from PVC or CPVC, are lightweight and resistant to corrosion. They are suitable for non-metallic applications, such as water distribution systems. According to a 2019 study by the American Water Works Association, plastic flanges show lower failure rates in certain environments when compared to metal. Their flexibility allows for easy installation and maintenance, making them a favorable choice in industries like plumbing and irrigation.
Alloy Materials:
Alloy materials, such as Hastelloy and Inconel, offer high performance in extreme environments, including high temperatures and pressures. These materials contain a mixture of metals and possess unique properties. A study published in the Journal of Materials Science in 2022 highlighted that alloy flanges provide superior durability in corrosive conditions often found in chemical processing industries. Their resistance to heat and chemical reactions makes them vital for specialized applications where standard materials might fail.
How Can You Ensure Proper Selection of Flanges for Various Applications?
Proper selection of flanges for various applications involves understanding material compatibility, pressure ratings, sizes, and joint design to ensure safe and effective performance. The key points include:
-
Material Compatibility: Selecting the correct material is crucial for flange performance. Consideration for the medium involves identifying whether it is corrosive, isothermal, or subject to high temperatures. For example, stainless steel flanges suit corrosive applications, while carbon steel flanges are often used for general purposes.
-
Pressure Ratings: Each flange has a specified pressure rating, which indicates the maximum pressure it can withstand. Common pressure rating standards include ANSI/ASME (American National Standards Institute/American Society of Mechanical Engineers). For instance, a class 150 flange can safely operate at a maximum pressure of 285 psi (pounds per square inch) at a temperature of 100°F.
-
Size and Dimensions: The size of a flange impacts its fit and functionality in a piping system. Flanges typically conform to standards outlined by ASTM (American Society for Testing and Materials) or ASME. For instance, a 6-inch flange has a nominal size that corresponds to an outer diameter and bolt circle diameter based on these standards.
-
Joint Design: Understanding the type of joint—such as raised face, flat face, or ring-type joint—affects sealing effectiveness. The raised face design, for example, enhances sealing under pressure by providing a small contact area that concentrates the load.
-
Application Conditions: Evaluate operational conditions like temperature, pressure, and the fluid being transported. This ensures flanges perform effectively under specific circumstances. As stated by the American Petroleum Institute (API) in 2022, mismatched conditions can lead to premature flange failure.
-
Surface Finish: The finish of a flange affects how well it seals. A smoother surface aids in creating a better seal, which prevents leaks. The common surface finishes include serrated and flat, with serrated finishes often providing better sealing properties.
-
Standards Compliance: Using flanges that comply with industry standards ensures reliability and safety. For example, adhering to API, ASME, or ISO standards helps guarantee that flanges meet required performance criteria.
By carefully analyzing these factors, the selection of flanges can align with the specific requirements of different applications, enhancing safety and performance in piping systems.
Related Post: