| 摘要 |
<p>A hydrostatic relief valve (10) for relieving ground water pressure on an in-ground swimming pool is disclosed. The valve includes a body (30) defining a flow path, an element (20) mounted to be moved in a direction from a position which blocks the flow path to retain the pool water to a position in which the flow path is open to allow ground water into the swimming pool, and a constraint by which the element is constrained, relative to the body. The valve is configured to, when open, allow ground water into the pool via the flow path up to a rate of at least 150 L/min and a pressure differential up to 150mm (water). This is advantageous in that the valve compensates for water being pumped out of an overfilled pool, such as by a pump which pumps at a rate of at least 150 L/min.</p> |
