What is the benefit of using the W72RS valve for both production and CIP?

The W72RS is designed for seamless transition between product flow and CIP, allowing processors to run production and cleaning cycles with minimal downtime. Its dual-seat mix proof design ensures complete separation between product and cleaning solutions, improving safety, reducing changeover time, and supporting high system uptime in continuous processing environments.

Is the W72RS considered part of the same lineage as the W71?

Yes. The W72RS is an evolution of the W71 platform, incorporating improved sealing technology and updated hygienic design principles. However, SPX’s D4 Series represents the newest generation, offering even greater ease of maintenance and CIP efficiency.

When should I choose a W72RS over other mix proof valves?

Choose the W72RS when your application demands superior sealing integrity, higher product safety, or greater cleanability than a traditional mix proof design. It’s well suited for high-value products, sensitive formulations, or operations requiring strict hygiene validation.

W72RS Series Mixproof Valves

Double Seat Mix Proof Minimal Spill Valves

Key Features: Safe, Continuous Production & 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:
- W72RS shut-off for safe separation in the fail-closed position
- W72RSP shut-off for products containing large particulates (up to 1.25” (32 mm) diameter)
- W72RS tank outlet version for safe separation between tank and servicing pipeline

Specifications:

Materials:
- Product Wetted: Stainless Steel, ASTM 316L (UNS-S31603); (DIN-1.4404)
- Non-Product: Stainless Steel, ASTM 304 (UNS-S30400); (DIN-1.4301)
- Seat: Tri-Ring Compression Seal on Upper Stem and Radial Seal Lower Stems
- Elastomers: EPDM or FKM (Fluoroelastomer)
- Finish: ≤ 32 Ra (≤0.8 m) Other finishes available upon request.
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)
Holding Pressure: 150 psi (10.3 bar)
Air Supply: 72 to 100 psi (5.2 to 6.9 bar)

Theory of Operation: Mixproof Valves

Mix proof valves are used to safely and efficiently process two different fluids (typically product and CIP) through the valve simultaneously. The mix proof design has two seats which isolate the upper and lower pipe lines when the valve is in the fail-safe closed position. The atmospheric vent cavity in between the seats creates a path for any leakage should the seats fail as well as a drain for CIP solution during seat cleaning. An optional external flush is available to clean the area between the seats and the vent drain while the valve is closed during production.

W72RS Mixproof Valve Overview

This video explains how the double-seat technology ensures safe product separation, reliable CIP performance, and efficient operation in sanitary processing systems.