| 摘要 |
This disclosure is directed to a full opening check valve for use in a pipeline. The apparatus incorporates a funnel shaped body which is welded to a pipe in the pipeline. The body encloses a chamber and an axial half circle guide extends thereacross and along part of the chamber to serve as a guide for pipeline pigs passing through this device. The funnel shaped body is welded to an end plate. The end plate has a slightly recessed circular shoulder on the inside. The circular shoulder sealingly receives a valve element. The valve element is constructed of a flat plate member and is hung from above on a straight barlike member serving as a hinge. The hinge extends from the end plate at the side. This enables the hinge rod to be connected to a damper or crank mechanism for controlled rotation. The end plate welds to a second pipe. This device is conveniently connected in the pipeline by welding to the connected pipes as mentioned above and provides a full opening to enable it to pass a pipeline pig, for example, having the diameter of the pipe.
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