TIANYU 3A FDA ISO CE ASME B16.34 DN15-DN100 PN10-PN16 Forged Stainless Steel 304/316L Hygienic Flange Ball Valve – Manual Operation for Food Beverage Pharmaceutical Applications
I. Product Overview
II. Important Attribute Specifications
A. Material Composition
- Valve Body & Bonnet: Forged Stainless Steel 304 (ASTM A182 F304) as standard; optional 316L (ASTM A182 F316L) for enhanced corrosion resistance. Forging eliminates internal defects (porosity, shrinkage) common in cast bodies, ensuring a dense, smooth structure. Chemical composition: 304 (Cr: 18–20%, Ni: 8–12%, C ≤0.08%); 316L (Cr: 16–18%, Ni: 10–14%, Mo: 2–3%, C ≤0.03%). Both alloys offer tensile strength ≥485MPa, yield strength ≥205MPa, and excellent resistance to chlorides, organic acids, and sanitizing agents (e.g., peracetic acid, chlorine dioxide).
- Ball: One-piece forged 304/316L stainless steel, full-port design. The ball’s surface is precision-polished to Ra ≤0.6μm to prevent media adhesion and facilitate thorough cleaning (CIP/SIP compatible). No welds or seams eliminate potential contamination points.
- Seat: Food-grade PTFE (Polytetrafluoroethylene, ASTM D4894) with FDA 21 CFR 177.1550 certification. PTFE is non-toxic, non-reactive, and resistant to most chemicals (acids, bases, solvents) and temperatures up to 150℃. Optional EPDM (ethylene propylene diene monomer) seats for high-temperature applications (up to 120℃) or FDA-compliant silicone for ultra-low temperature service (-40℃ to 120℃).
- Stem: Forged 304/316L stainless steel, anti-blowout design. The stem is polished to Ra ≤0.4μm to minimize friction with packing and prevent media entrapment. A keyway connection to the ball ensures secure torque transmission during operation.
- Packing: Food-grade PTFE-impregnated graphite packing, compliant with FDA standards. The multi-layer packing assembly provides leak-tight sealing (ANSI/FCI Class VI) while maintaining hygienic integrity—no contamination from packing materials.
- Flange & Fasteners: 304/316L stainless steel flanges (ASME B16.5 or DIN 11851) with raised face (RF) or flat face (FF) for hygienic gasket seating. Fasteners are 316L stainless steel bolts (ASTM A193 B8M) and nuts (ASTM A194 8M) to resist corrosion in washdown environments.
B. Dimensional & Pressure-Temperature Parameters
- Port Size (DN/NPS): DN15 (1/2”) to DN100 (4”), full-port design (bore diameter equal to nominal pipe size). This ensures unobstructed flow, minimizes pressure drop (Cv values from 15 for DN15 to 180 for DN100), and facilitates effective cleaning (CIP/SIP) by allowing full circulation of cleaning fluids.
- Pressure Rating: PN10 (1.0MPa) to PN16 (1.6MPa), aligned with ASME B16.34 pressure-temperature ratings for stainless steel valves. At 20℃, PN10 models handle 1.0MPa; PN16 models withstand 1.6MPa—suitable for low to medium-pressure hygienic systems (e.g., beverage filling lines, pharmaceutical transfer loops).
- Temperature Range: -20℃ to 150℃ (PTFE seats); -40℃ to 120℃ (silicone seats); 0℃ to 120℃ (EPDM seats). This covers most hygienic processes: cold storage (dairy), ambient filling (bottled water), and heated pasteurization (juices, sauces).
- End Connections: Hygienic flange (ASME B16.5 Class 150/300 or DIN 11851 Type A/B), designed for compatibility with standard hygienic pipelines. Flange faces are polished to Ra ≤1.6μm to ensure tight gasket sealing and prevent media leakage. Optional tri-clamp connections (DIN 32676) for quick-disconnect hygiene requirements.
- Face-to-Face Dimensions: Compliant with ISO 2852 (sanitary ball valves) and ASME B16.10, ensuring interchangeability with valves from other hygienic equipment manufacturers—simplifying replacement and retrofitting.
C. Operational & Hygiene Performance Parameters
- Sealing Performance: ANSI/FCI 70-2 Class VI bubble-tight sealing (≤0.1×DN mm³/min for liquid media). The PTFE seat conforms to the polished ball surface, eliminating leakage of sterile or food-grade media—critical for preventing contamination and product loss.
- Operation Type: Manual, with a cast stainless steel handwheel (diameter 80mm–200mm, scaled to valve size). The handwheel features an anti-slip, grooved design for secure grip in wet/washdown environments. A lockable option (with padlock hole) prevents unauthorized operation—essential for GMP compliance.
- Operating Torque: 15N·m (DN15, PN10) to 120N·m (DN100, PN16). The full-port ball and low-friction PTFE seat minimize torque, enabling easy manual operation even for large-diameter valves (DN100).
- Hygiene Compliance:
- Surface Finish: Internal wetted surfaces (body cavity, ball, seat) polished to Ra ≤0.8μm; external surfaces polished to Ra ≤1.6μm to resist dirt buildup and facilitate washdown.
- CIP/SIP Compatible: Designed for Clean-in-Place (CIP) and Sterilize-in-Place (SIP) processes. No dead legs (≤2× pipe diameter), smooth flow paths, and no crevices to trap media—ensuring complete cleaning and sterilization.
- Material Compliance: All wetted components meet FDA 21 CFR 177.2600 (food contact), 3A 18-03 (dairy hygiene), and ISO 10993 (biocompatibility for pharmaceuticals).
D. Certifications & Compliance
- Hygiene Certifications: 3A Sanitary Standards, FDA 21 CFR 177.2600, ISO 2852 (sanitary ball valves), GMP (Good Manufacturing Practices).
- Industrial Standards: ASME B16.34 (valve dimensions/pressure-temperature), ASME B16.5 (flanges), ISO 5208 (leakage classification), CE PED 2014/68/EU (pressure equipment).
- Quality & Environmental Certifications: ISO 9001 (quality management), ISO 14001 (environmental management), RoHS (restriction of hazardous substances).
III. Feature Description
A. Forged Stainless Steel Construction: Strength & Hygiene
- Defect-Free Structure: Forging compacts the stainless steel grain, eliminating porosity, shrinkage, and internal cracks common in cast valves. These defects can trap media, bacteria, or cleaning agents—posing contamination risks. In a dairy processing plant, forged valves maintained hygiene compliance for 5+ years, while cast alternatives required replacement after 18 months due to bacterial growth in porous areas.
- Corrosion Resistance: 304/316L forged stainless steel resists corrosion from acidic media (e.g., tomato sauce, vinegar) and sanitizing agents (e.g., sodium hypochlorite). 316L’s molybdenum content enhances resistance to chlorides—critical for coastal facilities or processes using salt-based cleaners.
- Smooth Surface Finish: Forged components are easier to precision-polish to Ra ≤0.8μm than cast parts, as they lack surface irregularities. This smoothness prevents media adhesion and ensures CIP/SIP processes remove all residues.
B. Hygienic Design Principles: Contamination Prevention
- No Dead Legs or Crevices: The valve’s internal geometry eliminates dead legs (unflushed areas where media can stagnate) and crevices (between components where bacteria grow). The body cavity is streamlined, with a full-port ball that, when open, creates a continuous flow path—ensuring cleaning fluids reach every wetted surface.
- One-Piece Ball: A single-piece forged ball (no welds or seams) eliminates potential contamination points. Welded balls, by contrast, can have micro-gaps where bacteria colonize—even after polishing.
- Smooth External Surfaces: The valve’s exterior is polished to Ra ≤1.6μm, resisting dirt, water, and cleaning agent buildup. This facilitates daily washdowns (common in food/pharmaceutical plants) and prevents cross-contamination from external debris.
C. Manual Operation: Simplicity & Reliability
- No External Power Dependencies: Unlike pneumatic or electric valves, manual operation requires no air lines, electrical connections, or control systems—reducing complexity and failure points. This is ideal for small-scale facilities or remote areas where power/air is limited.
- Ergonomic & Lockable Handwheel: The grooved, non-slip handwheel is easy to grip with gloved hands (standard in hygiene protocols). The lockable feature prevents accidental or unauthorized operation—critical for GMP-compliant processes where valve position directly impacts product safety.
- Low Maintenance: Manual valves have fewer moving parts (no actuators, solenoids, or sensors) than automated alternatives, reducing maintenance requirements. Routine upkeep is limited to packing replacement (every 2–3 years) and surface cleaning—minimizing downtime.
D. Food-Grade PTFE Sealing: Leak-Tight & Non-Reactive
- Non-Toxic & Non-Reactive: PTFE is inert, meaning it does not react with food, pharmaceutical, or cosmetic media—preserving product taste, purity, and efficacy. It is FDA-approved for direct food contact and does not leach harmful substances.
- Bubble-Tight Sealing: Class VI leakage ensures no media escapes, preventing product loss and cross-contamination. In sterile pharmaceutical processes, this eliminates the risk of airborne contamination from leaking valves.
- Wear Resistance: PTFE’s low-friction properties reduce wear on the polished ball surface, extending valve life. Even after 50,000+ open/close cycles, the seat maintains sealing integrity—outperforming rubber seals in high-cycle applications (e.g., beverage filling lines).

IV. Manufacturing Process & Quality Control
A. Raw Material Procurement & Inspection
- Stainless Steel Verification: Forged 304/316L blanks undergo spectral analysis (XRF) to confirm chemical composition (Cr, Ni, Mo content) and compliance with ASTM A182. Mechanical testing (tensile, yield, impact) verifies strength properties (≥485MPa tensile).
- Non-Destructive Testing (NDT): Forged components (body, bonnet, ball) undergo ultrasonic testing (UT) to detect internal defects (cracks, inclusions) and magnetic particle testing (MPI) to inspect surface flaws—only defect-free components proceed to machining.
- PTFE Seat Validation: Food-grade PTFE resin is tested for purity (≥99.5% PTFE), tensile strength (≥20MPa), and compliance with FDA 21 CFR 177.1550. Resin batches failing any test are rejected to prevent contamination risks.
B. Forging Process
- Billet Heating: Stainless steel billets (304/316L) are heated in a controlled-atmosphere furnace to 1100–1250℃—a temperature range that maximizes plasticity while avoiding grain growth.
- Precision Forging: Heated billets are forged into body, bonnet, and ball shapes using hydraulic presses (500–1000 tons) and custom dies. Forging ratio is maintained at ≥3:1 to ensure dense grain structure and uniform mechanical properties.
- Solution Annealing: Forged components undergo solution annealing (304: 1010–1120℃; 316L: 1040–1150℃) to relieve forging stresses, restore corrosion resistance, and improve machinability. Components are water-cooled to prevent carbide precipitation (which reduces corrosion resistance).
- Shot Blasting: Forged parts are shot-blasted to remove surface scale and oxide layers—preparing them for precision machining.
C. Precision Machining
- CNC Turning & Milling: Body, bonnet, and ball are machined on 5-axis CNC equipment to ASME B16.34 tolerances. Key machining steps:
- Body Cavity: Honed to a smooth finish (Ra ≤0.8μm) and streamlined to eliminate dead legs.
- Ball: Precision-ground to spherical accuracy (≤0.005mm) and polished to Ra ≤0.6μm. The ball’s sealing surface is lapped to match the PTFE seat for tight sealing.
- Flange Faces: Machined to ASME B16.5 flatness (≤0.02mm/m) and polished to Ra ≤1.6μm for gasket seating.
- Stem: Turned and ground to precise diameter (±0.01mm) and polished to Ra ≤0.4μm to minimize packing friction.
- Dimensional Inspection: All machined components are inspected with coordinate measuring machines (CMMs) to verify compliance with design specifications. Surface finish is measured with a profilometer to ensure Ra ≤0.8μm (internal) and ≤1.6μm (external).
D. Polishing & Hygiene Treatment
- Internal Wetted Surfaces: Components are polished using a multi-step process: rough grinding (to remove machining marks), fine grinding (to refine surface), and final polishing (to achieve Ra ≤0.8μm). Polishing is done with food-grade abrasives to prevent contamination.
- Passivation: Stainless steel components undergo passivation (nitric acid treatment) to form a protective chromium oxide layer—enhancing corrosion resistance and preventing bacterial adhesion. Passivation is followed by thorough rinsing with deionized water to remove acid residues.
E. Assembly & Hygiene Testing
- Component Cleaning: All parts (body, bonnet, ball, seat, stem) are cleaned in an ultrasonic bath with food-grade detergent, then rinsed with deionized water and dried in a HEPA-filtered oven—ensuring no dirt, oil, or debris remains.
- Seat Installation: The food-grade PTFE seat is pressed into the body’s seat pocket with controlled force (to ensure uniform contact with the ball).
- Stem & Ball Assembly: The stem is inserted into the bonnet, and the one-piece ball is keyed to the stem—ensuring secure torque transmission.
- Packing Installation: Multi-layer food-grade PTFE-impregnated graphite packing is installed around the stem, with controlled compression (10–15%) to balance sealing and operational torque.
- Body & Bonnet Assembly: The bonnet is bolted to the body using 316L stainless steel bolts, tightened in a crisscross pattern to uniform torque (per ASME B18.2.1)—ensuring no leakage at the body-bonnet joint.
- Hydrostatic Seat Test: 1.1× rated pressure (e.g., 1.76MPa for PN16) applied to the seat (bidirectional) for 15 minutes. Leakage is measured via bubble counting—Class VI compliance requires ≤1 bubble/minute for DN15.
- Hydrostatic Shell Test: 1.5× rated pressure (e.g., 2.4MPa for PN16) applied to the body cavity for 30 minutes—no leakage or deformation permitted.
- CIP/SIP Validation: Sample valves undergo CIP (80℃ alkaline cleaner) and SIP (121℃ steam) cycles to verify cleaning efficacy. Post-test, no media residues or bacteria (E. coli, Salmonella) are detected via swab testing.
- Surface Finish Verification: A profilometer confirms internal surfaces meet Ra ≤0.8μm and external surfaces ≤1.6μm.
F. Final Inspection & Packaging
- Visual Inspection: Check for surface defects (scratches, dents), proper polishing, and correct assembly. Valves with surface scratches (depth >0.05mm) are rejected—scratches can trap bacteria.
- Documentation: Each valve is shipped with a Hygiene Certificate (3A/FDA compliance), Material Test Report (MTR) for stainless steel components, and Test Report (hydrostatic/CIP validation).
- Hygienic Packaging: Valves are wrapped in food-grade polyethylene film and packed in cardboard boxes lined with sterile tissue—preventing contamination during transportation. Flange ends are capped with sterile plastic protectors to keep internal surfaces clean.

V. Product Advantages
A. Superior Hygiene & Regulatory Compliance
B. Durable & Corrosion-Resistant
C. Simple, Low-Maintenance Operation
D. Cost-Effective Hygiene
E. Versatile Compatibility
VI. Product Applications
A. Food & Beverage Industry
- Beverage Manufacturing: Bottled water, fruit juices, soft drinks, and alcoholic beverages. The valve controls flow during filling, blending, and pasteurization—with PTFE seats preserving taste and PTFE packing preventing leakage. CIP/SIP compatibility ensures thorough cleaning between batches.
- Dairy Processing: Milk, cheese, yogurt, and ice cream. The 316L stainless steel resists corrosion from lactic acid (in dairy), while the hygienic design prevents bacterial growth (critical for pasteurized and raw dairy products).
- Processed Foods: Sauces, soups, condiments, and frozen foods. The valve handles viscous media (e.g., tomato sauce) via its full-port design, and the smooth surfaces prevent media adhesion—ensuring product consistency.
B. Pharmaceutical & Biotechnology Industry
- Sterile Drug Manufacturing: Active Pharmaceutical Ingredients (APIs), injectables, and sterile formulations. The valve’s Class VI sealing prevents contamination of sterile media, while 316L stainless steel and PTFE meet biocompatibility standards (ISO 10993).
- Biotechnology: Fermentation processes, cell culture media, and protein purification. The hygienic design eliminates cross-contamination between batches, and CIP/SIP compatibility ensures sterile operation.
C. Cosmetic & Personal Care Industry
- Cosmetics: Lotions, creams, shampoos, and perfumes. The non-reactive materials (304/316L, PTFE) prevent product discoloration or chemical breakdown, while the hygienic design ensures product purity.
- Personal Care: Toothpaste, mouthwash, and skincare products. The valve’s smooth surfaces resist buildup of viscous media (e.g., toothpaste) and facilitate cleaning—maintaining hygiene in production lines.
D. Other Hygiene-Critical Applications
- Nutraceuticals: Vitamins, supplements, and functional foods. The valve’s FDA compliance ensures product safety, while the full-port design handles powdered or liquid nutraceutical media.
- Food Service: Commercial kitchens, catering facilities, and institutional food preparation (hospitals, schools). The manual operation and easy cleaning make it ideal for high-volume, hygiene-focused food service.
VII. Customization Advantages
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