High-Precision Aluminum Two-Stage Overfill Prevention Valve for Underground Fuel Tanks

High-Precision Aluminum Two-Stage Overfill Prevention Valve for Underground Fuel Tanks

The HY61SO-100 Series Overfill Prevention Valves are precision-engineered safety devices designed to protect underground storage tanks (USTs) during gravity-fed fuel deliveries. Unlike conventional single-stage valves, the HY61SO-100 features a self-contained two-stage positive shut-off system, which ensures controlled flow and prevents accidental overfill.

During operation, as the tank approaches approximately 92% of its capacity, the lower float in the valve rises, activating the primary poppet. This reduces the flow to around 10% of the normal rate, creating a line shock in the delivery hose. This tactile feedback alerts the driver that the tank is nearing full capacity. When the liquid reaches 95%, the upper float fully closes the valve, completely stopping the flow and preventing any further filling.

The HY61SO-100 is built for reliability and durability. Its two-stage, spring-loaded shut-off poppet minimizes line shock, while the vertical float design allows maintenance or removal even when the tank is full. The valve also includes an inspection test port for quick performance verification. The aluminum valve body is corrosion-resistant, and both the upper and lower tubes can be customized according to installation requirements.

Globally, this valve is recognized by different names depending on the region. In North America and Europe, it is often called an Overfill Shutoff Valve or Automatic Tank Fill Limiter. In Asia, it may be referred to as a Fuel Tank Anti-Overflow Valve or Auto Fill Stop Valve, while in the Middle East, it is known as a Tank Overfill Prevention Valve. In Russia, it is called Превентивный клапан переполнения (Preventive Overfill Valve). Despite these naming differences, the function remains the same: to protect USTs from overfilling, ensure operator safety, and prevent environmental hazards.

Choosing the HY61SO-100 Series means enhanced safety for gas stations, commercial fuel depots, and industrial UST systems. By automatically preventing overfill, it reduces product loss, prevents spillage, and helps facilities comply with global environmental and safety regulations. The HY61SO-100 Series is an ideal choice for anyone seeking a reliable, high-precision solution for underground fuel storage protection.