| 摘要 |
<p>The liq. pump contains a valve seat, a delivery valve duct and a delivery valve. The valve moves to and fro so that it cooperates with the seat alternately forming a passage or closure for the pumped liq. through the guide duct. The guide duct is made from polyoxymethylenee having great hardness and stiffness, good toughness and a low coefft. of friction. The valve head is asymmetrical in section perpendicular to the direction of flow, forming by an asymmetrical wing flap. The valve head is pushed away from the housing by a compression spring, and into contact with the seat.</p> |
