UF3 and UFR3 Valves are used to protect pumps and other related process equipment in the event of a pressure spike downstream of the pump. These valves can be set to relieve pressure in the range of 0-10 bar.

New: UF4 and UFR4 Series is being introduced to deliver this same functionality with the advantages of added controls to monitor pressure release events, and to actuate the valve during any required CIP cleaning.

Note: UF3 and UFR3 valves will still be available through the end of the 2023 and existing installations can be updated to include these added features through inserts. Standard options are available up to 10 bars, for higher pressures or for ATEX UF4/UFR4 options please consult SPX FLOW.

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UF4/UFR4 Valve Benefits and Features

Optimum Cleanability

No dead spaces in the valve body
Full opening cross section available during cleaning (no seat lift stroke limitation)
3-A approved designs and compliance with EHEDG guidelines
All product-contact components made of AISI 316L / DIN EN 1.4404 stainless steel

Downtime Reduction and Serviceability

Enhanced control via proximity switches or control unit feedback for pressure relief events
Seal lifting function supports cleaning and minimizes downtime
Clamp design ensures service-friendly maintenance

Process Optimization

External over-pressure relief valve protects pumps and redirects excess pressure
Modulating cone provides smooth valve closure to prevent pressure hammers
Standardized valve sizes: DN 25 to DN 100 / ISO 1″ to 4″

Valve Technical Features

Design and Upgrade Capability

Ball-shaped body with smooth passages—no sump or dome—for improved CIP cleaning
Standard seat lift actuator includes feedback switches
UF4/UFR4 inserts retrofit into existing UF3/UFR3 housings for simple upgrades
Wide pressure range achievable using four actuator configurations
Maintenance-free UF4 actuator reduces service costs and downtime
Metal stop ensures defined seat seal compression, minimizing material stress
Compatible with CU4 and CU4plus control units for automated functionality

Key Applications

The UF Series pressure relief valve is designed to protect installations against excess pressure

Dairy
Beverage
Brewery
Chemical
Cleaning In Place (CIP)

Specifications
Options
Performance

Materials:

Product wetted parts: 316L, 1.4404 (DIN EN 10088)
Non-Product wetted parts: 304, 1.4301 (DIN EN 10088)
Seal: EPDM, HNBR, FPM (FDA Compliant)
Internal Surface Finish: ≤32 Ra (≤0.8µ)

Sizes:

1” – 4” O.D. Tube
DN25 – DN 100

Pressure Ratings:

Operating Pressure: 0 – 10 BAR

Temperature Ratings:

EPDM, HNBR - 275ºF (135ºC), short time - 284ºF (140ºC)
FPM (not to be used for hot water) - 212ºF (100ºC)

Wide range of housing/body configurations

Comprehensive range of valve housings are available to cover any requests.

Control Unit:

The UF4/UFR4 valves can be delivered with a comprehensive range of CU4, CU4plus control units. The CU4, CU4plus are electrically provided to connect direct (DC) to a PLC system (CU4, CU4plus Direct connect) and to fieldbus protocols such as AS-i. Additionally, CU4plus also supports fieldbus protocol such as IO-link.

Proximity switch:

Proximity switches detects valve full open or close condition during any required CIP cleaning.

Regulating (controlled) cone variant:

Optimized control cone design provides slower, smoother valve closure to avoid water hammers.

Retrofit kits:

Retrofit kits or Replacement inserts fits into existing UF3/UFR3 housings making an easy upgrade to next generation with improved features.
To simplify our designs and offer the use of the CU4 control unit on UF3 valves, UF3 to UF4 retrofit kits are being made available.
These retrofit actuator kits, include the UF4 actuator, yoke and stem, are designed to fit directly into legacy UF3 body.
UF3 aftermarket parts (including actuators and seal kits) will remain available to service the legacy installed base. These parts are all available in the manual.

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