Design And Sealing Principle Of Anti-mixing Valve

A mixproof valve enables two different products to flow through the same valve without cross-contamination. The double-seat design features two independent plug seals. The space between seals forms a leakage chamber kept at atmospheric pressure. If a seal fails, leaking product diverts through this chamber to drain, preventing the two fluids from mixing.

How does a mixproof valve prevent cross-contamination?

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

2. A leakage chamber between seals provides a physical break.

3. Leakage outlets divert any seal leakage to drain.

4. Seat lift enables individual seal cleaning without valve disassembly.

Common Application Pitfalls

• ⚠️ Standard single-seat valve with incompatible products: Direct cross-contamination path.

• 🛑 No leakage detection: Early seal wear signs missed.

• 🔧 No seat lift support: CIP ineffective.

• 🚫 Wrong configuration: Lack balanced plugs for pressure shock immunity.

Mixproof Valve vs Standard Double-Seat Valve

• Standard double-seat valve: Two seals, no leakage chamber. Seal failure allows mixing.

• Mixproof valve: Two seals with leakage chamber. Seal failure diverts leakage to drain.

• Extra protection: Leakage detection ports enable visual inspection.

Unlike standard valves, mix proof valves actively divert seal leakage to drain.

The Double-Seat Design – How the Leakage Chamber Works

Two independent plug seals create an atmospheric leakage chamber between them. This forms a physical break between process streams.

Protection mechanisms:

• Valve open: Chamber closed, product flows without spillage.

• Valve closed: Chamber opens to atmosphere or drain.

• Seal leak: Product flows to chamber and discharges through outlet.

• Pressure shock: Balanced plug prevents mixing during surges.

A double seat mixproof valve with balanced plug handles pressure shocks. Mixproof valve operation uses pneumatic actuation with independent stem movement.

Conforms to API 598 (leakage testing) and ISO 15848 (fugitive emissions).

Hygienic Design Features

Sanitary applications require self-draining bodies, no dead legs, and Ra ≤ 0.8 μm finish.

Key features:

• Single-piece forged body: Minimizes joints

• Self-draining spherical body: Enhanced cleaning

• Leak detection ports: Visual inspection

• Seat lift: CIP without valve disassembly

3A and EHEDG certified.

Configurations and Specifications

Selection parameters: Balanced plug for pressure shock immunity; leakage detection ports; seat lift for CIP.

Applications

Food & beverage: Dairy, beer, wine, juice. EPDM seals, Ra ≤ 0.8 μm, 3A Sanitary. Balanced plug for CIP pressure shocks.

Pharmaceutical: Bioreactors, sterile water, API. PTFE seals, Ra ≤ 0.4 μm electropolished, SIP, USP Class VI.

Personal care: Lotions, creams, toothpaste. EPDM seals, Ra ≤ 0.8 μm.

Double-Seat Protection

A mixproof valve prevents cross-contamination through double-seat design and leakage chamber.

For food: Double seat mixproof valve, EPDM, Ra ≤ 0.8 μm, 3A.

For pharma: Double seat mixproof valve, PTFE, Ra ≤ 0.4 μm electropolished, SIP.

Mixproof valve operation uses independent stem movement and seat lift. Double seat mixproof valve with balanced plugs handles pressure shocks. API 598 and ISO 15848 provide standards. 3A and EHEDG certify hygienic designs. Mix proof technology serves food, pharmaceutical, and personal care industries.

Pneumatic Stainless Steel Steam Sterilization Aseptic Shut Off Valve

• Pneumatic Shut Off valve with steam sterilization, which has been widely used in the food processing industry, beverage production of pharmaceutical and fine chemical industries. The valve has a standard function of reversing seat valve equipped with a stem that can be sterilized by cleaning fluid or steam to ensure that the stem is thoroughly cleaned.

Product Description