The Butterfly Mixproof Valve, also known as the Leakage or Block and Bleed Butterfly Valve, offers a sophisticated solution for safely managing two non-compatible process streams. Manufactured by Cipriani Harrison, this valve combines the proven benefits of a standard butterfly valve with the advanced security of mixproof technology, allowing either total separation or controlled blending of two applications.
Design & Operation
Seal Technology
Technical Specifications
Key Features
Configuration Options
The Butterfly Mixproof Valve uses a dynamic double-disc, double-seal mechanism:
- Valve Closed: The two discs and seals completely separate the two process streams. A dedicated leakage chamber and spring-loaded valve assembly provide a secure escape path for any seal leakage, ensuring early leak detection
- Valve Open: When actuated, the valve allows the two previously separated applications to mix seamlessly
This intelligent, modular design provides a hygienic, reliable, and easy-to-maintain solution for complex piping systems.
The Butterfly Mixproof Valve is available with a variety of sealing materials to suit different media and temperatures:
- EPDM
- HNBR
- FPM (Viton®)
- VMQ (Silicone)
- PTFE
These options guarantee chemical compatibility and long service life across a range of demanding applications.
| Feature |
Specification |
| Size Range |
DN25 – DN100 / 1″ – 4″ |
| Max Line Pressure |
10 Bar |
| Supply pressure for Air Actuator |
6 Bar |
| Sterilisati9on Temperature |
Up to 135°C |
| Material |
Stainless Steel 304L/316L |
| Certifications |
3A, FDA |
- Mixproof Technology: Two discs and two seals maintain complete separation of incompatible media
- Leakage Detection: Integrated leakage chamber with spring-loaded valve ensures early identification of seal failures
- Hygienic Design: Self-draining body suitable for sanitary applications; minimal product retention
- Flexible Actuation: Available as manual or pneumatically actuated, with various control options
- Easy Maintenance: User-friendly construction with minimal moving parts simplifies cleaning and service
- Compact and Lightweight: Optimised design for easy installation and reduced space requirements
Tank Bottom Valve Option
- Special tank bottom flange with self-draining radius eliminates product hold-up.
- Customisable for different tank standards and actuator types.
- Perfect for installations where product cleanliness and quick draining are critical.
- Manual or Actuated Operation: Choose simple hand operation or automated control
- Various End Connections: Compatible with hygienic fittings such as Tri-Clamp, DIN, SMS, RJT, and others
- Custom Sizes Available: Standard sizes range from DN25 to DN100, with bespoke options on request
Whether you require safe product separation, hygienic blending, or reliable tank draining, Tapflo UK’s Butterfly Mixproof Valve delivers uncompromised performance and safety.
