Introduction
KF (QF) HV Conical Reducer Nipples are essential vacuum fittings designed to connect different nominal sizes within high vacuum (HV) systems. By enabling smooth transitions between pipeline diameters, these components help maintain stable flow dynamics and vacuum integrity. Manufactured from 304L stainless steel, they offer excellent corrosion resistance, low outgassing, and compatibility with a wide range of vacuum applications.
Detailed Description
KF (Quick Flange, QF) Conical Reducer Nipples feature a tapered internal geometry that allows for gradual transitions between two flange sizes (e.g., KF25 to KF40). This conical design minimizes turbulence, reduces conductance losses, and improves vacuum efficiency compared to abrupt step reductions.
Constructed from 304L stainless steel, these reducer nipples provide enhanced weldability and reduced carbon content, which helps prevent carbide precipitation and ensures better corrosion resistance. The smooth internal surface finish further contributes to low outgassing and improved cleanliness, both critical for maintaining high vacuum environments.
KF connections utilize centering rings with elastomer O-rings (typically Viton or NBR), along with clamp assemblies, allowing for quick installation and disassembly without the need for bolts. This makes KF conical reducers especially suitable for modular vacuum systems, laboratory setups, and frequently reconfigured equipment.
These components are precision-machined to ensure tight tolerances and reliable sealing performance. They are fully compatible with standard KF vacuum hardware, including valves, tees, crosses, and bellows.
Applications
KF (QF) HV Conical Reducer Nipples are widely used in:
- High vacuum (HV) systems and pipelines
- Laboratory vacuum setups and R&D equipment
- Semiconductor and thin film deposition systems (PVD, CVD)
- Vacuum furnaces and analytical instruments
- Leak detection systems and vacuum testing setups
- Modular vacuum assemblies requiring frequent size transitions
Technical Parameters
| Parameter | Typical Value / Range | Importance |
|---|---|---|
| Material | 304L Stainless Steel | Low outgassing, corrosion resistance |
| Flange Type | KF (QF) | Quick assembly and compatibility |
| Size Range | KF10 – KF50 (custom available) | Flexible system integration |
| Geometry | Conical (tapered transition) | Improves conductance and flow |
| Sealing Method | O-ring (Viton, NBR) | Ensures reliable vacuum sealing |
| Vacuum Range | ~10⁻³ to 10⁻⁸ mbar | Suitable for high vacuum systems |
| Surface Finish | Smooth, machined | Reduces contamination and outgassing |
Comparison with Related Components
| Component Type | Key Advantage | Typical Application |
|---|---|---|
| Conical Reducer Nipple | Smooth transition, improved conductance | Vacuum pipelines |
| Straight Reducer | Simple design, cost-effective | General vacuum systems |
| KF Adapter Flange | Connects KF to other standards | Hybrid vacuum systems |
FAQ
| Question | Answer |
|---|---|
| What is the advantage of a conical reducer design? | It provides a smoother transition between sizes, reducing turbulence and improving vacuum conductance. |
| Are KF reducer nipples reusable? | Yes, they are reusable, and O-rings can be easily replaced when needed. |
| Can sizes be customized? | Yes, various size combinations and custom designs are available. |
| What sealing materials are commonly used? | Viton (FKM) and NBR are the most common, depending on temperature and chemical compatibility. |
| Are these suitable for UHV applications? | KF systems are generally used for high vacuum; CF flanges are recommended for UHV environments. |
Packaging
Our KF (QF) HV Conical Reducer Nipples (304L SS) are meticulously tagged and labeled externally to ensure efficient identification and maintain high standards of quality control. We take great care to prevent any potential damage during storage and transportation, ensuring the products arrive in perfect condition.
Conclusion
KF (QF) HV Conical Reducer Nipples provide an efficient and reliable solution for connecting different vacuum line sizes while maintaining system performance. With their conical design, high-quality 304L stainless steel construction, and ease of installation, they are an essential component in modern vacuum systems.
For detailed specifications and a quotation, please contact us at sales@thinfilmmaterials.com.
Ordering Table
| Flange Size/OD (Large) | Flange Size/OD (Small) | Type | Flange Material | Drawing | Bore | Overall Length | Part Number |
| KF25 (1.57" OD) | KF16 (1.18" OD) | Reducing Nipple, Conical | 304L SS |
| 0.63 | 1.57 | QF25XQF16C |
| KF40 (2.16" OD) | KF16 (1.18" OD) | Reducing Nipple, Conical | 304L SS |
| 0.63 | 1.57 | QF40XQF16C |
| KF40 (2.16" OD) | KF25 (1.57" OD) | Reducing Nipple, Conical | 304L SS |
| 0.88 | 1.57 | QF40XQF25C |
| KF50 (2.95" OD) | KF16 (1.18" OD) | Reducing Nipple, Conical | 304L SS |
| 0.63 | 1.57 | QF50XQF16C |
| KF50 (2.95" OD) | KF25 (1.57" OD) | Reducing Nipple, Conical | 304L SS |
| 0.88 | 1.57 | QF50XQF25C |
| KF50 (2.95" OD) | KF40 (2.16" OD) | Reducing Nipple, Conical | 304L SS |
| 1.63 | 1.57 | QF50XQF40C |
Accessories Table
| Description | For | Per Package | Part Number |
| Cast Clamps (SS) | KF10, KF16 Flanges | 1 | QF16-075-CS |
| Cast Clamps (SS) | KF25 Flanges | 1 | QF25-100-CS |
| Cast Clamps (SS) | KF40 Flanges | 1 | QF40-150-CS |
| Cast Clamps (SS) | KF50 Flanges | 1 | QF50-200-CS |
| Cast Clamps (Aluminum) | KF10, KF16 Flanges | 1 | QF16-075-C |
| Cast Clamps (Aluminum) | KF25 Flanges | 1 | QF25-100-C |
| Cast Clamps (Aluminum) | KF40 Flanges | 1 | QF40-150-C |
| Cast Clamps (Aluminum) | KF50 Flanges | 1 | QF50-200-C |
| Lever Clamps (Aluminum) | KF10, KF16 Flanges | 1 | QF16-075-CHA |
| Lever Clamps (Aluminum) | KF25 Flanges | 1 | QF25-100-CHA |
| Lever Clamps (Aluminum) | KF40 Flanges | 1 | QF40-150-CHA |
| Centering Ring (SS with Fluorocarbon O-Ring) | KF10 Flanges | 1 | QF10-050-SRV |
| Centering Ring (SS with Fluorocarbon O-Ring) | KF16 Flanges | 1 | QF16-075-SRV |
| Centering Ring (SS with Fluorocarbon O-Ring) | KF25 Flanges | 1 | QF25-100-SRV |
| Centering Ring (SS with Fluorocarbon O-Ring) | KF40 Flanges | 1 | QF40-150-SRV |
| Centering Ring (SS with Fluorocarbon O-Ring) | KF50 Flanges | 1 | QF50-200-SRV |
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