The Caleffi 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 valve is pre-adjustable, the system pressure can be adjusted to the appropriate pressure before the system-charging phase and then will automatically shut off the water feed. A preassembled internal cartridge contains the controlling components of 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.
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