The Watts 0770180 is a heavy-duty 1/2 inch float valve from the rugged ST500 Series, specifically engineered for reliable level control in demanding HVACR refrigeration units, cooling towers, and industrial water storage. Built with a high-strength bronze body and a 1/2-inch male NPT threaded inlet and outlet, this mechanical float valve can handle an operating pressure up to 125 psi. The assembly features a precise cotter pin pivot arm and a durable Buna-N seal to ensure positive shut-off and prevent overflow in evaporative condensers and high-cycling refrigeration systems. This model is identical to the ST500-1/2, providing field-proven performance in temperature environments up to 180°F. Its straight-body design and replaceable plunger assembly simplify maintenance for service technicians, making it a standard choice for commercial water systems and large-scale irrigation applications. Key Benefits Durable Material: Constructed with a corrosion-resistant bronze body and brass rod components to withstand harsh water conditions in industrial settings. High Flow Performance: Delivers approximately 20 gpm at 50 psi and up to 31 gpm at 100 psi, ensuring rapid tank recovery. Field Serviceability: Features replaceable seals and a removable plunger assembly, allowing for quick repairs without replacing the entire valve body. Precise Level Control: The serrated arm design provides easy adjustability to maintain exact water levels in evaporative coolers. Common Questions What is the maximum pressure rating for this 1/2" float valve? The Watts ST500 series is designed to operate safely at a maximum working pressure of 125 psi (8.7 bar). Is the ST500-1/2 compatible with potable water systems? This specific model is a standard bronze float valve intended for non-potable applications such as cooling towers, irrigation, and industrial water tanks. What size float ball and rod should be used with this valve? This valve is compatible with standard 1/4"-20 threaded rods. Ensure your float ball is sized appropriately for the buoyancy required at your specific system pressure. 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.
