公开(公告)号：US3943958A

公开(公告)日：1976-03-16

申请号：US512260

申请日：1974-10-04

申请人： Roy Forrest Davis, Jr.

发明人： Roy Forrest Davis, Jr.

IPC分类号： F16K24/06 ,  F16K24/00

CPC分类号： F16K24/06 ,  Y10T137/3294

摘要： A valved cap is provided for the top of a riser pipe connected to a flow line under pressure such as may be found in irrigation systems and is normally closed when the system is in operation. The valve automatically opens when the system is stopped to admit air for preventing a vacuum build up and closes under pressure when the system is started up during which time air in the riser pipe is permitted to escape to avoid a pressure build up while the valve is closing. An apertured fitting connected to the valve stem within the riser pipe connects to a flexible air vent hose extending down the riser pipe and into the main flow line in the direction of the flow and air trapped in the riser pipe after the valve is closed is siphoned through the hose into the main flow line to be expelled into the atmosphere at an outlet in the main line.

摘要翻译： 在连接到压力的流动管线的提升管的顶部设置有阀盖，例如可以在灌溉系统中找到，并且当系统运行时通常关闭。 当系统停止时，阀门自动打开以允许空气在系统启动时防止真空积聚并在压力下关闭，在此期间，提升管中的空气允许逃逸，以避免压力积聚，同时阀门 关闭。 连接到提升管内的阀杆的有孔配件连接到柔性通气软管，该柔性排气软管沿着流动管延伸并沿着流动方向延伸到主流线中，并且在阀关闭之后被吸入提升管中的空气被虹吸 通过软管进入主流线，在主线的出口被排出到大气中。