| 摘要 |
A piston valve for improving the output efficiency of a diaphragm pump includes a central discharge base and a plurality of water inlet ports, wherein each of the discharge base and water inlet ports is provided with a top concave surface, and a plastic gasket is engaged with the concave surface of the water discharge base and a piston slice is engaged with the concave surface of each water inlet port so that a gap is defined between the gasket and its concave surface and a gap is also defined between each piston slice and its corresponding concave surface. |
