| 摘要 |
An automatic air bleed valve which allows air to escape from water lines. Allowing air to thus escape, prevents pump cavitation and/or air in the heater. The air bleed valve is positioned between a pump and the heater, and is higher than the heater, and no higher than the water level in the spa. The air bleed valve comprises a vertically disposed cylinder containing a piston and having a valve bottom, a valve inlet proximal to the valve bottom, valve top, and a valve outlet proximal to the valve top. The piston moves vertically in the cylinder. While water is present in the cylinder, the piston raises and cooperates with a seal to prevent a flow of water through the valve. While air is present in the cylinder, the piston drops and allows the air to flow past the piston to the valve outlet.
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