| 摘要 |
<p>The pump housing (1) designed for connection to the opening of the container consists of a one-piece sleeve-like member of an elastic material and comprises inlet and outlet valves (5 and 6, respectively). Radial compression of the walls of the pump housing opens the outlet valve (6) to dispense the product while the inlet valve is held closed. When the walls of the pump housing return to their normal shape, an underpressure arises inside the pump housing, thereby opening the inlet valve and an amount of the liquid or paste product is drawn into the interior of the pump housing.</p> |
