Features And Applications Of Anti-mix Valve

A mixproof valve prevents cross-contamination between two different fluids using two independent plug seals with a leakage chamber between them. This chamber stays at atmospheric pressure, creating a physical break between fluid streams. If one seal fails, leaking product flows into the chamber and exits through a dedicated outlet, preventing mixing.

How does a mixproof valve prevent cross-contamination

1. Two independent plug seals separate the two fluid streams.

2. A leakage chamber between the seals remains at atmospheric pressure.

3. A leakage outlet diverts any seal leakage to drain.

4. One line can be cleaned while the other continues production.

Common Design Pitfalls

•  Using a standard single-seat valve: Creates a direct path for cross-contamination. → Specify a mixproof valve for incompatible product junctions.

•  Overlooking leakage detection: Early seal wear signs go unnoticed. → Specify leakage detection ports with visual indicators.

•  Ignoring water hammer protection: Pressure surges can force seals open. → Specify balanced plug designs for pressure shock immunity.

•  Specifying wrong configuration: Not all double-seat valves offer true mixproof separation. → Confirm two independent seals and an atmospheric leakage chamber.

The Double-Seat Design – How the Leakage Chamber Works

A mix proof valve has two independent plug seals. The space between them forms a leakage chamber at atmospheric pressure, creating a physical break between process streams.

Protection mechanisms:

• Valve open: Leakage chamber closed, allowing product flow.

• Valve closed: Leakage chamber opens to atmosphere or drain.

• Seal leak: Product flows into chamber and exits through outlet.

• Pressure shock: Balanced plugs prevent fast disc closure, reducing water hammer risk.

A mix proof valve with balanced plug design protects against mixing even during pressure surges. A mix proof valve is controlled via pneumatic actuation with independently moving stems.

Hygienic Design Features

• Single-piece forged body: Minimizes joints and dead legs

• Self-draining spherical body: Minimal flow resistance

• Leakage detection ports: Visual inspection without disassembly

• Seat lift: Enables cleaning without opening the valve

• Surface finish: Ra ≤ 0.8 μm prevents bacterial adhesion

A mixed proof valve with 316L construction and electropolished finish meets 3-A Sanitary and FDA requirements.

Configurations and Specifications

Specifications:

• Body: 316L stainless steel

• Surface finish: Ra ≤ 0.8 μm

• Max temperature: Up to 140°C

• Max pressure: Up to 10 bar

Applications

Food and beverage: Dairy, beer, wine, juice. Mix proof valves with EPDM seals, 316L body, 3-A Sanitary. Simultaneous product flow and CIP cleaning.

Pharmaceutical: Bioreactors, sterile water, API. Mixed proof valves with PTFE seals, electropolished finish, SIP compatibility.

Personal care: Lotions, creams, toothpaste. Mix proof valves with EPDM seals, self-draining body.

Tank bottom: Mixproof valve with radial sealing and seat lift enables tank cleaning without process interruption.

Mixproof Valve Design

Mixproof valves prevent cross-contamination through double-seat design and atmospheric leakage chamber. Two independent seals separate fluid streams. Leakage chamber provides a physical break between circuits. Leakage outlets divert seal leakage to drain. Unlike standard double-seat valves, mixproof valves provide a physical break between circuits. Seal replacement: 2-5 years depending on service. Mix proof valve selection requires configuration, seal material, and size.

Aseptic Stainless Steel Pneumatic Shut Off Valve

• The aseptic shut off valve has a diaphragm sealing structure, which avoids the contamination of materials by external organisms during the opening and closing process of the valve.
• The seal is made of Daikin materail and the drum structure design ensures usability and durability to a greater extent, with a lifespan of more than 100,000 times.
• The valve body if forged from SS316L round sttel and precision machined by CNC. The inner surface roughness can reach Ra≤0.4μm.

Product Description