Caleffi 300


Caleffi’s 5350 Series AutoFill fast-fill/pressure-reducing valve maintains system pressure at a set value, automatically feeding water as required when installed on the water inlet piping in closed hydronic systems. Because the value is pre-adjustable, the system pressure can be adjusted to the appropriate pressure before the system charging phase and will then automatically shut off the water feed. A pre-assembled internal cartridge contains the controlling components as a self-contained unit, facilitating ease of inspection and maintenance procedures. Available in 3/4” sweat or union connection, it includes an integral downstream pressure gauge and pressure-setting adjustment knob.