Sanitary Cip Anti-mixing Butterfly Valve Design Characteristics And Applications

For processes requiring absolute separation of two incompatible media, the sanitary butterfly valve with butt-weld mixproof design uses a double-disc, double-seal configuration with a ventable leakage chamber between the seals. Available in SS304 or SS316L with welded connections from 3/4" to 4", this valve handles water, oil, and process fluids at pressures up to 10 bar and temperatures from -20°C to 120°C. When closed, the two discs create separate sealing edges against the seats, forming an intermediate chamber at atmospheric pressure. If either seal fails, the leaking medium drains through the leakage outlet, providing immediate detection and preventing cross-contamination between product and CIP streams.

Double-Seal Design and Leakage Chamber Principle

The hygienic butterfly valves incorporate two independent sealing systems. Each disc creates a peripheral sealing edge against the valve seat when closed. The space between these two seals forms a leakage chamber that remains at atmospheric pressure. This chamber serves as a safety barrier: if one seal fails, the leaking medium flows into the chamber and drains through the outlet.

The double-seal configuration ensures that even if one seal deteriorates, the second seal maintains isolation between the two media streams. The leakage chamber can be flushed through dedicated ports, eliminating dead areas where product could accumulate. This design provides true mix-proof safety, making the stainless steel sanitary butterfly valve suitable for applications where product and CIP media must never mix.

Welded Connection and Sanitary Construction

• The butterfly valve sanitary design uses welded connections that eliminate external seals and retention cavities.

• This gap-free installation prevents bacterial ingress and product entrapment at connection points.

• The valve body and disc are manufactured from SS304 or SS316L stainless steel.

• EPDM, silicone, and NBR sealing materials ensure compatibility with water and oil media across the temperature range.

Technical Specifications

Applications Requiring Absolute Media Separation

The sanitary butterfly valves are specified for processes where two incompatible media must never mix. In dairy processing, the valve separates product flow from CIP return lines during cleaning cycles. In pharmaceutical manufacturing, it isolates WFI from cleaning solutions in purified water systems. In beverage production, the valve prevents cross-contamination between different product runs or between product and sanitizing agents. The double-seal design enables concurrent operations—product flows through one port while CIP flows through the other, reducing downtime by eliminating the need to shut down production for cleaning cycles.

Operational Workflow

1. In the closed position, both discs seal against their respective seats.

2. The leakage chamber between the seals remains open to atmosphere.

3. If a seal fails, the leaking medium drains through the leakage outlet.

4. The discs rotate simultaneously via mechanical linkage for synchronized operation.

Engineering Value for Hygienic Processing

The sanitary butterfly valve reduces contamination risks through its double-seal design with leak detection. Welded connections eliminate external seals that could fail or trap product. The self-draining body design prevents product hold-up, supporting CIP protocols without disassembly. SS304/SS316L construction with EPDM, silicone, or NBR gaskets ensures compatibility with water and oil media.

Proper valve selection ensures reliable media separation. Match seal material to process temperature and chemical compatibility—EPDM for general service, silicone for pharmaceutical applications, NBR for oil resistance.

1. Verify size (3/4" to 4") matches pipeline specifications.

2. Confirm temperature rating (-20°C to 120°C) for process conditions.

3. Select seal material (EPDM, Silicone, NBR) compatible with product and CIP chemicals.

4. Ensure welded connections are installed per qualified welding procedures.

These measures ensure reliable, contamination-free operation. Properly specified sanitary butterfly valve delivers absolute media separation with leak detection in hygienic processing applications.

Sanitary Stainless Steel Butt Weld CIP Mixproof Butterfly Valve

• We can supply Sanitary Butt-Weld Butterfly Valve, Sanitary Tri-Clamp Butterfly Valve, Hygienic Male Thread Butterfly Valve, Sanitary Pneumatic Butterfly Valve, Hygienic Electric Butterfly Valve.
• The Butterfly valve body and disk are all made from full CNC machined, high grade level polish.
• All of the products have been 100% press tested before shipping.
• It is necessary you specify at the time when orders be placing if heat numbers and MTR's are required.
• EPDM, Silicon and Viton seats are available for installing in our butterfly valves which are suitable for many applications in such as food, dairy, beverage, meat processing, chemical, and many other industries.

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