Caleffi 521409A Thermostatic and Pressure Balanced Mixing Valve

Caleffi 521409A Thermostatic and Pressure Balanced Mixing Valve delivers precise hot-water control for domestic hot water, hydronic and radiant heating systems. This 3-way, adjustable valve blends hot and cold water with a thermostatic and pressure-balanced design to maintain a stable output temperature, reducing scald risk and improving comfort.

Key specifications include a nominal 1/2 inch size with soldered x soldered x soldered end connections, and a flow rate of 1 GPM. The set temperature range is 85 to 150 °F, with a maximum operating temperature of 200 °F and a pressure rating of 200 PSI. The valve supports a flow capacity of 3 CV and a maximum differential pressure of 20 PSI, with a maximum inlet ratio of 2:1 (hot/cold or cold/hot).

Key features:

• Three-way, thermostatic and pressure-balanced mixing valve for consistent water temperature
• Nominal size 1/2 inch with soldered end connections for reliable installation
• Flow rate 1 GPM and flow capacity 3 CV for steady performance
• Lead-free construction meets ASSE 1017, CSA B125.3, NSF/ANSI 372, IPC, IRC, UPC, NPC standards
• Set temperature range 85–150 °F; max temperature 200 °F; max inlet 200 PSI
• Maximum differential pressure 20 PSI; maximum inlet ratio 2:1
• Inclusions: stainless steel spring, EPDM seal, PPO shutter for durability
• Applications: domestic hot water, hydronic and radiant heating systems

Built to meet multiple plumbing standards and designed for lead-free performance, this valve ensures safe, reliable temperature control in residential and light commercial installations.