W71 Series - Double Seat Mixproof Shut-Off Valves

Mixproof valves provide safe separation of dissimilar products within the same valve body.

Features & Benefits

Safe, Continuous Production and Cleaning:

Proven mix proof valve design allows plants to maximize production and minimize downtime for cleaning
Full mix proof model portfolio for completely automated systems:
- W71 model for general-purpose shut-off with safe separation in the failed-closed position
- W71 tank outlet version for safe separation between tank and servicing pipeline
- W73 models for non-slamming diverting of flow

Robust and Durable:

Compression seat design on upper and lower stems provide long seat life and reliability
Optional Tef-Flow™ P seats are a durable, chemically inert solution for demanding, high temperature, or sticky processing applications
WCB’s signature machined-from-bar bodies and components offer a robust and reliable valve solution
Consistently thick body wall dimensions & laser welded port extensions minimize body distortion during manifolding & extreme fluid temperature changes
Balanced design for resistance to hydraulic shock

Flexibility and Modularity:

True-line mix body sizes and custom 45° or other angled ports available to match complicated pipe design
Custom port lengths and center-to-center dimensions can match competitor and legacy series valves to provide easy drop-in replacements
AL6XN alloy product zone parts available for corrosive products
Various control top models available to fit customer needs: cost-effective CU4; full-featured, robust WCB control tops; or state-of-the-art Burkert 8681
Choice of adapter options with stem flush, wiping stem seals, and steam sterilization

Low Cost of Ownership with Easy Maintenance:

Heavy-duty construction maximizes service life
Minimum propriety parts gives off-the-shelf availability and low price of most spares and tools
Long life actuator is field-maintainable with finger-safe, caged springs and cartridge piston assemblies
Simple, easy-to-maintain design is intuitive and does not require advanced mechanical skills
Compressed air not required for disassembly, maintenance, or assembly procedures after removal from body
Adjustable seat clean travel allows users to optimize CIP flush going to drain
External flush connections are stationary allowing hard piping of utilities and no pinch points

For general purpose mixproof applications, we offer the W71 Series for standard shutoff service.

Materials

Pressure Ratings (Operating Pressure)

1½" - 3" (38mm - 76mm) Sizes - 150 psig (10 bar)
4" (102mm) Size - 100 psig (7 bar)
4" (102mm) Sch. 5 Size - 150 psig (10 bar)
6" (152mm) Size - Consult Factory
6" (152mm) Sch. 5 Size - 150 psig (10.3 bar)