| 摘要 |
<p>The invention relates to a volumetric-dynamic diaphragm pump and a volumetric-dynamic piston pump to be used in water supply, both types being submersible pumps with double efficiency as compared with the volumetric pumps. According to the invention, the pumps are capable to work at high frequency of up to 15 openings and closings/second and consist of a common suction and forcing valve () structured by two types, namely: a ring valve () and a second special ring valve () with vertical flaps, both types having as a main parameter a maximal valve lifting height with some minimal values in the range of h= 2 mm and all the size parameters with certain minimal values strictly correlated with the maximal lifting height.</p> |
