[DISCONTINUED] UF3 and UFR3 Series - Relief Valves

Upgrade to the Next Generation of Hygienic Protection

As production standards evolve, so do the demands for higher hygiene, easier maintenance, and improved process reliability. To ensure our customers stay ahead with the most advanced technology, APV will discontinue offering the UF3/UFR3 valve series as new equipment.

This is the perfect opportunity to move to the UF4/UFR4 Pressure Relief Valve Series [Pressure Relief Valve - UF4 Series] —our latest, fully CIP‑able design that delivers superior hygienic performance, standardized spare parts, and compatibility with modern automation systems.

APV will continue to support UF3/UFR3 spare parts for the coming years, but the greatest value comes from upgrading. With a quick and simple valve‑insert replacement, you can transform your existing valves into the latest UF4/UFR4 configuration in just minutes—no pipework changes, no downtime headaches.

Pressure Relief Valve - UF4 Series

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Upgrade from APV UF3/UFR3 to UF4 Pressure Relief Valves

Simplified Valve Technology Transition

Due to continuous innovation, APV has discontinued new production of the Delta UF3/UFR3 Series. However, the UF4/UFR4 valve insert is fully compatible with existing UF3/UFR3 housings, offering an easy upgrade path to the latest valve technology—typically in less than 5 minutes with no major plant modifications.

Enhanced Performance for Modern Process Demands

The latest APV UF4 Pressure Relief Valves are engineered to meet the highest hygienic standards in the industry while delivering superior performance for today’s processing requirements.

With seat‑lift functionality included as standard, the UF4 ensures effective seat cleaning during CIP by activating the seat lift while the cleaning media flows through the line. This helps maintain optimal hygiene and protects your product from contamination.

The UF4 series can also be fully equipped with our APV Control Units enabling automation, seat‑position detection, and real‑time feedback to your control system—giving you greater process safety, visibility, and reliability.

New UF4 Variants for Every Application

The UF4 platform includes specialized versions designed for demanding conditions:

UFHP – High Pressure version for processes requiring higher operating pressures
UFMS – Aseptic version for sterile and ultra‑clean applications

Experience improved hygiene, automation readiness, and long‑term peace of mind with the UF4/UFR4 valve series—your next step toward a safer, smarter, and more efficient process.

Support for UF3/UFR3 Installations

Servicing Legacy Equipment

If you're not ready to upgrade, UF3/UFR3 spare parts are still available to minimize downtime. Please note: OEM parts are required to maintain warranty coverage.

Explore Your Options

Whether you’re ready to move forward with UF4/UFR4 or maintain existing equipment, SPX FLOW provides the solutions you need. Explore the Pressure Relief UF4 Series.