Conbraco 35-603-01 Regulator

The Conbraco 35-603-01 Regulator is a heavy-duty bronze feed water pressure regulator engineered for hydronic heating systems requiring precise pressure management. Featuring a 1/2" Female NPT inlet and outlet, this unit is designed to automatically maintain system pressure within an outlet adjustment range of 10-25 PSI, ensuring consistent performance in medium-to-large residential or light commercial boilers. With a max inlet pressure of 100 PSI and a temperature rating up to 210F, it handles standard thermal loads without diaphragm fatigue. A critical feature for contractors is the integrated purge lever and fast fill function, which allows for rapid system charging and simplified air removal during commissioning or maintenance. The EPDM diaphragm and high-capacity internal strainer protect the valve seat from debris, extending the service life of the Apollo valve assembly in demanding closed-loop applications.

• Fast Fill Manual Override: Simplifies initial system filling and system purging by bypassing the pressure-reducing seat.
• Corrosion-Resistant Bronze Body: Provides superior durability and longevity compared to iron alternatives in glycol or water systems.
• Adjustable Pressure Settings: The pressure reducing valve comes factory set at 12 PSI but is easily field-adjustable to meet specific head pressure requirements.
• High Temperature Resilience: Rated for 210-degree max temperature, making it suitable for high-limit boiler operation.
• Integral Strainer: Protects the internal 10-25 PSI regulator components from pipe scale and sediment buildup.

Common Technical Questions

How do you adjust the discharge pressure on the Conbraco 35-603-01?
To adjust the boiler feed water regulator, loosen the locknut on the top screw and turn the bolt clockwise to increase the outlet pressure or counter-clockwise to decrease it. Always use a calibrated gauge to verify the final setting.

Can this regulator be installed in any orientation?
While the 1/2 inch NPT regulator is versatile, it is best practice to install it horizontally with the purge lever accessible and the flow arrow pointing toward the boiler to ensure the fast fill feature operates correctly.

What causes a pressure regulator to constantly weep at the relief port?
This typically indicates sediment is trapped in the valve seat or the inlet pressure exceeds the 100 PSI threshold. Cleaning the internal strainer or checking the expansion tank charge usually resolves the issue.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.