公开(公告)号：US3811469A

公开(公告)日：1974-05-21

申请号：US32643773

申请日：1973-01-24

Applicant: INT STANDARD ELECTRIC CORP

Inventor： FRIES H

IPC: F04B53/10 ,  F16K15/14

CPC classification number: F04B53/1037 ,  F16K15/141 ,  Y10T137/7879

Abstract: A check valve for a sump pump having a hollow cylindrical intake with ports therethrough, wherein a hollow half-toroid has one side sealed to the intake above or below the ports, a part of the half-toroid and/or an additional part forming an annular flexible lip to seal with the opposite side of the ports, the lip forming a check valve at its location to prevent fluid inside the cylinder from leaking out thereof through the ports.

Abstract translation: 一种用于具有中空圆柱形进气口的排水泵的止回阀，其具有穿过其中的端口，其中中空半环形体的一侧在端口上方或下方密封到入口，半环形的一部分和/或形成 环形柔性唇缘与端口的相对侧密封，唇缘在其位置形成止回阀，以防止气缸内的流体通过端口泄漏。