Pressure regulator CALEFFI 535051 3/4" 25 bar with pressure gauge

CALEFFI 535051 is a 3/4" water pressure regulator designed to reduce and stabilize incoming mains or pump pressure for domestic and light-commercial systems. Rated for operation up to 25 bar, the valve includes an integrated pressure gauge to provide immediate visual confirmation of downstream pressure. The regulator is intended for installation on inlet lines to boilers, water heaters, pumps, and distribution manifolds to protect fixtures, appliances and piping from excessive pressure fluctuations.

Advantages

The pressure regulator provides precise downstream pressure control and long-term stability thanks to a balanced internal mechanism. Its compact 3/4" body suits typical residential and small commercial pipework while the integrated pressure gauge allows quick checks without additional instruments. Constructed for reliability in water distribution, the valve helps reduce wear on fixtures and extend the service life of connected equipment. Installation and routine verification are simplified by the visible gauge and standard threaded connections.

Suitable for

• Domestic water supply pressure reduction
• Inlet protection for boilers and water heaters
• Pressure regulation for pumps and pressure booster systems
• Feeding distribution manifolds in apartments and small commercial buildings

Key specifications

• Connection size: 3/4" (female/male threaded depending on installation)
• Maximum operating pressure: 25 bar
• Integrated analog pressure gauge for downstream pressure reading
• Application medium: potable water and general water distribution
• Typical installation position: inlet of boilers, pumps or manifolds

How to use

Install the regulator in the cold-water inlet line with correct flow direction indicated on the body and use appropriate thread sealant for the pipe connections. After installation, gradually open the upstream shut-off valve and observe the integrated gauge while adjusting downstream pressure to the required setpoint if the model provides an adjustable mechanism. Verify that downstream fixtures operate correctly and re-check the gauge after initial operation to ensure stable pressure. Follow local plumbing codes and isolate the supply before servicing.

Usage recommendations

For reliable performance, fit the regulator where it can be easily accessed for periodic inspection of the gauge and connections. Where water quality is poor or contains particulate matter, install a coarse strainer or filter upstream to prevent debris from affecting the valve mechanism. If installed on systems with potential backflow, complement the regulator with appropriate backflow prevention devices as required by regulations.