What Is the Tri-Clamp Flexible Connector?
The Tri-Clamp (TC) Flexible Connector is a sanitary flexible sleeve with stainless steel TC ferrules at both ends, joined by standard hygienic quick clamps. An integrated O-ring gasket is formed into each ferrule, eliminating separate loose washers. It connects sifters, rotary valves, and conveying lines in hygienic powder and bulk material processing.![Assortment of SOSHH custom length cylindrical and conical Tri-Clamp flexible PU connectors]()
Custom Length & Conical Flexible PU Sleeves
![SOSHH Sanitary Tri-Clamp flexible PU connector with hot-melt welded SS ferrules and integrated O-ring gasket]()
Tri-Clamp Flexible Connection Structure
💡 Executive Summary :Core Innovation: SOSHH® Tri-Clamp (TC) Flexible Connectors combine transparent FDA polyurethane (PU) sleeves with precision SS304/SS316L ferrules and integrated O-ring gaskets.Primary User Benefit: Eliminates separate rubber washers entirely—preventing accidental gasket displacement and deadly product batch contamination in food, dairy, and pharmaceutical API lines.Fast Maintenance: 100% sanitary tool-free assembly and disassembly in under 30 seconds.Standards Compliance: Certified for FDA 21 CFR 177.2600, EC 1935/2004, and ATEX Zone 20/21/22 explosive powder environments.
In hygienic powder conveying, sifter discharge, and rotary valve connections, traditional flexible sleeves requiring separate Tri-Clamp gaskets create major operational headaches. Field operators frequently misalign loose gaskets during CIP maintenance, leading to powder micro-leakage or, worse, loose rubber washers dropping into the process stream.
The SOSHH® Tri-Clamp Flexible PU Connector solves this bottleneck with a seamlessly integrated O-ring gasket design. The transparent PU body is hot-melt welded directly to stainless steel TC quick-clamp connectors, delivering a leak-proof, zero-contamination seal every single time.
Key Features & Engineering Advantages
- Integrated Sanitary Gasket (Zero Contamination Risk): Built-in O-ring seal eliminates the need for separate loose washers. Saves installation time while completely preventing gasket displacement and batch contamination.
- Standard Sanitary Tri-Clamp Compatibility: Both ends feature precision SS304 or SS316L ferrules compatible with all standard hygienic TC clamps.
- 30-Second Tool-Free Assembly: Ergonomic quick-clamp mechanism allows plant operators to remove and reinstall flexible joints in under 30 seconds during Clean-In-Place (CIP) washdowns.
- 100% Transparent Visual Flow Monitoring: Crystal-clear PU wall allows real-time visual inspection of powder flow, bridging, and material buildup.
Typical Applications
| EQUIPMENT | WHY A TC CONNECTOR | KEY PARAMETER |
|---|
| Vibratory Sifters & Screeners | Isolates high-frequency vibration, dust-tight transition | Vibration stroke, diameter |
| Rotary Valves | Absorbs flange misalignment at valve inlet/outlet | Valve flange OD |
| Pneumatic Conveying Lines | Flexible connection between line and hopper/feeder | Pressure/vacuum, bore |
| Weighing Hoppers & Load Cells | Low parasitic reaction force for accurate weighing | Thin-wall PU05, length |
| Bulk Bag & FIBC Discharge | Dust-tight connection at discharge spout | Spout diameter |
| Packaging & Filling Machines | Rapid changeover between product runs | Sleeve length, clamp size
|
Industries Served
The TC flexible connector is specified across hygienic and industrial powder processing sectors:
| INDUSTRY | TYPICAL APPLICATION | COMMON REQUIREMENT |
|---|
| Food & Beverage | Flour, sugar, starch transfer | FDA tested, CIP |
| Dairy & Milk Powder | Spray dryer discharge, powder conveying | Sanitary, quick clamp |
| Pharma & Nutraceutical | API and excipient transfer | Integrated gasket, SS316L |
| Battery Materials | Cathode/anode powder handling | Static-dissipative option |
| Chemical | Powder and granule transfer | PTFE for corrosive media |
| Coffee, Spices & Pet Food | Flavor changeover lines | Rapid clean-out
|
![Sanitary Tri-Clamp flexible connector key features and tool-free connection diagram]()
Tri-Clamp Flexible Joint Key Features
Material Selection Matrix (FDA & ATEX Compliant Grades)
Select the ideal sleeve material formulation based on your specific bulk material properties, working temperature, and explosion hazard zoning:
| Material Code | Material Formulation | Primary Application | Color / Appearance | Wall Thickness | Temp Range (°C) | Surface Resistivity (Ω) | Food Grade Compliance |
|---|
| PU10 | Polyurethane (PU) | General-purpose bulk powder handling & granule transfer | Clear / Transparent | 1.0 mm | -20 to +110 | > 10¹² | FDA & EC Compliant |
| PU05 | Polyurethane (PU) | Precision weighing hoppers & loss-in-weight feeders | Clear / Transparent | 0.5 mm | -20 to +110 | > 10¹² | FDA & EC Compliant |
| PUHT | High-Temp Polyurethane | High-temperature processing & hot air drying lines | Clear / Transparent | 1.0 mm | -20 to +150 | > 10¹² | FDA & EC Compliant |
| PUAS | Anti-Static Polyurethane | Handling combustible & explosive powders (Sugar, Starch) | Clear / Transparent | 1.0 mm | -20 to +110 | < 10⁹ (ATEX Zone 20/21/22) | FDA & EC Compliant |
| PURF | Fiber-Reinforced PU | High positive and negative pressure pneumatic conveying | Opaque White | 0.8 mm | -20 to +110 | > 10¹² | FDA & EC Compliant |
| PUFL | Helix Wire Reinforced PU | Dynamic flexing, stroke alignment & offset piping | Translucent White | 0.6 mm | -20 to +110 | > 10¹² | FDA & EC Compliant |
| TE02 | 100% Pure PTFE | Corrosive acids, strong bases, organic solvents & high heat | White | 0.2 mm | -40 to +300 | > 10¹² | FDA & EC Compliant |
| TE02AS | 100% Pure Anti-Static PTFE | Corrosive chemicals in ATEX hazardous dust environments | Black | 0.2 mm | -40 to +300 | < 10⁶ | FDA & EC Compliant |
Silicone TC Connector Option
For live-steam SIP (121°C) and high-temperature hygienic lines, SOSHH builds the TC sleeve body from platinum-cured silicone, operating continuously from -50°C to +200°C. Specify silicone when the process runs continuous steam sterilization or high-heat CIP that exceeds the PU temperature range.
![]()
![SOSHH Tri-Clamp flexible PU connector material matrix showing PU10, PU05, PUHT, and PUAS specifications]()
![SOSHH reinforced polyurethane and PTFE flexible sleeve material specification matrix showing PURF, PUFL, TE02, and TE02AS]()
Polyurethane (PU) Sleeve Material Specification Matrix (PU10 to PUAS) and Reinforced PU and PTFE Sleeve Material Specification Matrix (PURF to TE02AS)
Model & Dimension Matrix (DN76 to DN508)
SOSHH® supplies a complete standard size range matching international TC sanitary flange specifications:
| Item / Sr. No. | Joint Outer Dia. D (mm) | Clamp Flange O.D. C (mm) | Available Sleeve Length CL (mm) | Ferrule Material Options |
|---|
| 1 – 9 | 76, 89, 102, 104, 108, 114, 127, 133, 140 | 91, 106, 119, 119, 119, 130, 145, 145, 155 | 100 to 1000 mm (Customizable) | Stainless Steel 304 / 316L |
| 10 – 18 | 152, 154, 159, 168, 180, 204, 219, 254, 273 | 168, 183, 183, 183, 200, 217, 233, 268, 286 | 100 to 1000 mm (Customizable) | Stainless Steel 304 / 316L |
| 19 – 27 | 305, 325, 356, 377, 406, 425, 457, 476, 508 | 319, 350, 380, 400, 430, 450, 480, 500, 530 | 100 to 1000 mm (Customizable) | Stainless Steel 304 / 316L |
- Custom Length (CL): Standard collar lengths include 100 mm, 150 mm, 200 mm, 250 mm, 300 mm, 500 mm, and up to 1000 mm. Custom non-standard lengths are prototyped within 48 hours (minimum length: 100 mm).
Stainless Steel TC Ferrule Specifications
The stainless steel ferrule is the critical sealing interface of the Tri-Clamp connection. SOSHH supplies both standard and heavy-wall ferrule options matched to the sleeve diameter.
Ferrule Material Grades
| GRADE | CHARACTERISTICS | TYPICAL USE |
|---|
| SS304 | Standard hygienic grade, good corrosion resistance | General food, dairy, and powder lines |
| SS316L | Low-carbon, superior chloride and acid resistance | Pharma API, aggressive washdown, chemical exposure |
Ferrule Wall Thickness
| TYPE | WALL THICKNESS | APPLICATION |
|---|
| Standard Ferrule | [NEEDS VERIFIED — confirm thickness per DN] | General powder and granule transfer |
| Heavy-Wall Ferrule | [NEEDS VERIFIED — confirm thickness per DN] | High-vibration sifters, high-pressure conveying, frequent clamp cycling |
Ferrule Surface Finish
Ferrules are supplied with a smooth product-contact surface to support hygienic cleaning. Surface roughness specification is available on request for pharma-grade applications.
![Engineering dimensional diagram for Tri-Clamp flexible connector showing Joint OD D, Flange OD C, and Length CL]()
Tri-Clamp Connector Model Dimensions
Step-by-Step Installation Guide (< 30 Seconds)
Step 1: Weld TC Quick-Clamp Connectors (Skip if pipeline is pre-welded)
Measure the outside diameter (O.D.) of your equipment stub or piping. Select the matching SOSHH® stainless steel TC ferrule and complete full orbital welding on both pipe ends sequentially.
Single-Use & Disposable TC Connector Options
For single-use bioprocessing, R&D batches, and high-contamination-risk campaigns, SOSHH offers single-use TC flexible connectors designed to be replaced after each batch or campaign.
When to Choose Single-Use
- Eliminating cross-batch cleaning validation
- High-potency API or allergen handling
- Short clinical or pilot campaigns
- Avoiding CIP chemical usage on disposable lines
Configuration
| OPTION | DESCRIPTION |
|---|
| Pre-assembled TC Sleeve | Sterile-ready sleeve with integrated ferrules, packed individually |
| Bulk Single-Use Sleeves | Cost-optimized for frequent changeover lines |
| Custom Single-Use Lengths | Fabricated to your installation gap |
Contact our engineering team to specify single-use sleeve length, ferrule grade, and packaging requirements.
Weld Ferrule Types
| FERRULE TYPE | DESCRIPTION | BEST FOR |
|---|
| Butt-Weld Ferrule | Welded directly to pipe ends | New installations, hygienic permanent joints |
| Tube OD Weld Ferrule | Slips over existing tube OD before welding | Retrofit of existing piping |
| Blank / Cap Ferrule | Closes an unused port | Line isolation and future expansion |
Selection rule: match the ferrule bore to the pipe inside diameter to maintain a crevice-free product path and avoid powder entrapment at the weld root.
![Step 1 guide for welding TC quick-clamp connectors on field equipment piping]()
Weld TC Quick-Clamp Connectors Step 1
Step 2: Mount Flexible Sleeve & Tighten TC Clamps
- Align the flexible sleeve between the top and bottom welded TC ferrules.
- Position the integrated O-ring ferrule directly against the pipe flange face.
- Sequentially place standard sanitary Tri-Clamp clamps on both ends and hand-tighten the wing nuts or bolts to complete a dust-tight, leak-proof assembly.
![Step 2 guide for mounting TC flexible sleeve and tightening Tri-Clamp clamps]()
Mount Sleeve and Tighten TC Clamps Step 2
Ready-to-Install Assemblies
For OEM machinery builders and repeat projects, SOSHH supplies ready-clamp assemblies that arrive with ferrules welded, sleeve mounted, and clamps pre-fitted. This removes field welding and alignment from your installation scope.
Deliverables include:
- Pre-welded ferrule + sleeve assembly
- Matched sanitary clamps
- Dimension confirmation drawing for your equipment interface
TC Ferrule Industry Standards
Tri-Clamp connection dimensions follow recognized sanitary standards. Understanding the standard helps you specify the correct ferrule and clamp size.
| STANDARD | SCOPE | RELEVANCE |
|---|
| ISO 2852 | International standard for stainless steel clamp-type couplings | Ferrule and clamp mating dimensions |
| ISO 2037 | Stainless steel tubes for food industry | Tube OD matching for weld ferrules |
| DIN 32676 | German standard for hygienic clamp fittings | Ferrule and groove geometry |
| LKH (Alfa Laval) | Pump and fitting interface standard | Pump discharge connections |
SOSHH ferrules are fabricated to match industry-standard clamp dimensions so they mate with existing standard sanitary clamps.
Choosing the Right Connector Type
| REQUIREMENT | RECOMMENDED |
|---|
| Sanitary clamp connection, frequent CIP | TC Quick-Clamp |
| Daily tool-free changeover, grooved spigot | SF Snap-In |
| Bolted flange piping | FLC Round Flange |
| Square / rectangular duct | FLR Square |
When to choose the TC: when the line uses welded TC ferrules and sanitary clamps, when the connection is opened for CIP washdown, or when an integrated gasket must replace loose washers.
🛡️ Quality Assurance & Official Test Reports
All SOSHH® Tri-Clamp flexible connectors are manufactured in accordance with strict ISO9001 hygienic quality management procedures. Download our third-party testing credentials below:
![Certified quality assurance: SGS, MA, ilac-MRA, and CNAS laboratory testing reports for sanitary flexible connectors]()
📄 [Download PDF Report] 📐 Technical Resources, CAD Drawings & RFQ Downloads
Frequently Asked Questions
Q: Why choose an integrated gasket Tri-Clamp flexible connector over standard sleeves?
A: Traditional sleeves require loose rubber or silicone gaskets sandwiched between flanges. During vibration or routine washdowns, loose gaskets shift, leading to powder leaks or batch contamination. SOSHH® integrated O-ring gaskets are fused directly to the ferrule, guaranteeing 100% alignment and zero gasket drop.
Q: Can these Tri-Clamp connectors withstand CIP (Clean-In-Place) washdown chemicals?
A: Yes. Our PU10, PU05, and PUHT polyurethane grades resist standard CIP sanitizers and hot water up to 110°C (150°C for PUHT). For harsh concentrated acids or solvents, select our TE02 100% PTFE flexible sleeves rated from -40°C to +300°C.
Q: Are 3D CAD STEP files available for plant equipment designers?
A: Yes. We provide free 3D STEP models and 2D CAD drawings for all standard TC sizes (DN76 to DN508). Contact our engineering desk at soshh.com to receive instant CAD files for SolidWorks or AutoCAD integration.
Q: What is the global shipping lead time for custom TC sleeve lengths?
A: Standard TC sizes ship from stock within 24 hours. Custom flange diameters or specific sleeve lengths (CL) are manufactured within 48 hours and delivered worldwide via DHL/FedEx Express in 7–14 days with DDP (Delivered Duty Paid) terms available.
Q: What makes the TC connector suitable for high hygiene applications?
A: The integrated O-ring gasket is fused directly to the ferrule, eliminating loose washers that can shift or fall into the process stream. The crevice-free bore reduces powder entrapment, and the connector supports CIP cleaning without removal.
Q: Is the TC connector FDA approved?
A: The TPU material passed FDA 21 CFR 177.2600 total extractives testing. This is a material compliance test result, not a product certification. Test documentation is available on request.
Q: How do I specify a custom TC connector?
A: Provide the ferrule outer diameter, clamp flange O.D., sleeve length, operating temperature, powder type, and whether CIP is used. Our engineering team will confirm the matching dimensions.
Q: Which material should I choose — TPU, PTFE, or Silicone?
A: Ether-based TPU for standard powder handling and CIP washdown. PTFE for corrosive chemicals and high heat. Platinum-cured silicone for live-steam (SIP) applications. See the Material Selection Guide for a full comparison.
🛠️ B2B Engineering Services & Factory Support
- Free OEM Sample Express: Request a free test sample for OEM trial runs and plant validation. Shipped via DHL Express within 24 hours.
- Custom Prototyping Desk: Need non-standard flange diameters or eccentric offset sleeves? Our engineering team designs custom solutions within 48 hours.
- Global DDP Express Delivery: Hassle-free door-to-door delivery with prepaid duties to North America, Europe, Southeast Asia, and Australia.
Conclusion & Actionable Next Steps
Eliminate gasket drops, line downtime, and compliance risks with SOSHH® Sanitary Tri-Clamp Flexible PU Connectors.
👉 Need custom ferrule CAD drawings or an official factory quotation?
Contact our engineering team at soshh.com to receive complete technical support within 12 hours.
