Description
The Caleffi 535059A is a professional-grade AutoFill™ automatic boiler feed filling valve engineered to regulate and maintain proper pressure in closed hydronic heating systems. Designed for commercial and residential applications, this robust valve reduces manual maintenance, enhances system reliability, and delivers consistent performance over time — making it an ideal choice for HVAC technicians and plumbing professionals.
Key Features
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Automatic System Pressure Control: Automatically fills your hydronic system to the preset pressure and shuts off when the desired level is reached, eliminating the need for manual watering.
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Durable Brass Construction: Rugged brass body with reinforced components offers long-lasting corrosion resistance and dependable service life.
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Integral Pressure Gauge: Built-in downstream pressure gauge lets you quickly monitor system pressure.
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Adjustable Pressure Setting: Factory preset to ~15 psi with an easy-turn knob for custom pressure adjustments (typically up to ~90 psi).
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Sweat Union Connections: 3/4″ sweat union fittings deliver secure, professional-grade installation on hydronic feed lines.
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High Performance Rating: Designed for up to 365 psi working pressure and flows up to ~24 gpm, suitable for a wide range of systems.
