Stainless Steel 304/316 Spring Non Return Valve

Sanitary check valve (also known as one-way valve) is a core anti-back flow equipment specially designed for hygiene-sensitive industries such as food, pharmaceutical, bioengineering, beverage and fine chemical. Its core function is to only allow one-way flow of medium and accurately prevent medium contamination, equipment damage and process disorder caused by reverse back flow. The product adopts "swing/lift" core structure, equipped with our patented sanitary sealing technology. From material selection, structural design to surface treatment, it fully complies with 3A, FDA, and GB 12237-2007 standards, completely eliminating sanitary dead corners and ensuring the cleanliness of medium transmission process and process stability. It is an essential equipment for key nodes such as sterile production lines, liquid distribution systems and storage tank outlets.

1.Ultimate Sanitary Design, Preventing Cross-Contamination

①Material safety: Parts in contact with medium are made of 304/316L medical-grade stainless steel, which has undergone solution treatment to improve intergranular corrosion resistance by 40%, complying with GB 4806.9-2016 requirements for food contact materials;

② Dead-corner-free structure: Valve body adopts integrated precision casting, internal flow channel with 360° arc transition, swing-type valve disc adopts streamlined design, no sanitary dead corners such as threads and welds, completely avoiding medium residue;

③Mirror polishing process: Surface roughness in contact with medium is Ra≤0.4μm (customizable Ra≤0.2μm semiconductor-grade polishing), reducing medium adhesion, suitable for CIP (Cleaning in Place) and SIP (Sterilization in Place), sterilization temperature up to 135℃/30min;

④ Food-grade sealing: Adopts imported silicone rubber (Si), EPDM or fluororubber (FKM) seals, passing FDA 21 CFR 177.2600 certification, no peculiar smell and no dissolution, suitable for acidic, alkaline, organic solvents and other media.

2.Wide Working Condition Adaptability, Reducing Selection Cost

① Multiple structures optional: Swing type is suitable for large diameter (DN50-DN300) and high flow scenarios (such as beverage production lines); lift type is suitable for small diameter (DN15-DN40) and high precision scenarios (such as pharmaceutical sterile liquid distribution), meeting the needs of different process nodes;

② Flexible connection methods: Supports three connection methods of quick-install (sanitary clamp), flange (HG/T 20592) and welding. Quick-install type disassembly time ≤5 minutes, suitable for production lines with frequent maintenance;

③ Extreme environment resistance: Wide temperature operation from -40℃ to 200℃ (adjusted according to seal material), suitable for extreme working conditions such as low-temperature cold storage (such as dairy refrigeration) and high-temperature sterilization workshop (such as canning processing);

④ Multi-medium compatibility: 316L material model can adapt to corrosive media (such as citric acid, traditional Chinese medicine extract), fluororubber seal model can adapt to organic solvents (such as alcohol, acetone), reducing the purchase cost of special valves.

3.Long-Term Stable Operation, Reducing Operation and Maintenance Cost

①High wear-resistant parts: Valve disc adopts "stainless steel substrate + ceramic coating" process, hardness up to HV1200, wear resistance increased by 5 times, service life up to 80,000 hours (operating 8 hours a day can be used for 27 years);

②Maintenance-free design: Built-in food-grade solid lubricated bearing, no need to add lubricant for life, avoiding medium contamination by grease;

③Easy maintenance structure: Quick-release valve seat design, seals can be replaced without disassembling the valve body, maintenance time ≤10 minutes, reducing downtime loss;

④ Full-process traceability: Each product is equipped with a unique identity code, which can query material report, test data and factory information, meeting GMP traceability requirements of pharmaceutical industry.

Had the pleasure of working with Miss Daisy Gu, and l can confidently say that she is exceptionally cooperative and helpful. Throughout our interactions, she consistently demonstrated a high level of professionalism and dedication. Miss Daisy Gu was always prompt in her responses, addressing all mygueries and concerns with great patience and clarity. The quality of the material provided was alsooutstanding, it met all my expectations and reauirements,  reflectina the excellent standards of thecompany. The products were well-packaged and delivered on time, ensuring that there were no issuesupon arrival. Overall, l am extremely satisfied with the service and support provided by Miss Daisy Gu. Helassistance made the entire process smooth and hassle-free. l highly recommend her and look forward tofuture collaborations.

Satisfecha con la compra. excelente servicio del proveedor. muy buen seguimiento del proveedor.
Las piezas seven debuena calidad.

Satified with the Quality and all the service. Everything is Good!!

1.Installation Points

① Direction confirmation: Install strictly according to the valve body arrow mark, ensure medium flow direction is consistent with the arrow, reverse installation will cause anti-backflow failure;

② Pipeline cleaning: Must clean the inside of the pipeline before installation, remove welding slag, iron filings and other impurities, avoid valve disc jamming leading to sealing failure;

③ Sealing surface protection: For quick-install connection, ensure no scratches on the sealing surface, clamp evenly tightened, avoid leakage caused by uneven force;

④ Reserved space: When installing swing type model, reserve space ≥ valve disc diameter on the valve disc side to avoid affecting opening and closing;

⑤ Pressure test: After installation, conduct a tightness test with 0.8 times the nominal pressure to ensure no leakage.

2.Maintenance Tips (Reduce Operation and Maintenance Cost)

① Daily inspection: Check the pressure difference between inlet and outlet every day. If the pressure difference exceeds 0.1MPa, check whether there is valve disc jamming or seal aging;

② CIP/SIP specification: During cleaning, temperature should not exceed the seal tolerance upper limit, pressure controlled at 0.3-0.5MPa, avoid high-pressure impact damaging the sealing surface;

③ Seal replacement: When leakage or increased opening and closing noise occurs, replace the seal in time. It is recommended to use original accessories to ensure sealing performance;

④ Long-term shutdown: Clean the inside with purified water before shutdown, seal the inlet and outlet after drying to avoid dust entering;

⑤ Fault handling: If valve opening is difficult, check whether there is medium crystallization jamming. Do not knock the valve disc with hard objects, which needs to be disassembled, cleaned and reinstalled.