Double-plate slow-shut check valve

Abstract

The invention discloses a double-plate slow-shut check valve. A check opening at the front end of a valve (3) forms a backward-inclined 2 to 30 degree acute angle with a water inlet flange face. The iThe invention discloses a double-plate slow-shut check valve. A check opening at the front end of a valve (3) forms a backward-inclined 2 to 30 degree acute angle with a water inlet flange face. The inside of the check opening at the front end of the valve (3) is provided with a vertical beam (10) of which the front face is level with the check opening. The vertical beam (10) and the annular surfanside of the check opening at the front end of the valve (3) is provided with a vertical beam (10) of which the front face is level with the check opening. The vertical beam (10) and the annular surface of the check opening are provided with dovetail grooves (4). The valve (3) in front of the dovetail grooves (4) is provided with a valve shaft (5) parallel to the check opening. A left semicircularce of the check opening are provided with dovetail grooves (4). The valve (3) in front of the dovetail grooves (4) is provided with a valve shaft (5) parallel to the check opening. A left semicircularvalve plate (6) and a right semicircular valve plate (11) are positioned on the valve shaft (5) in a door hinge state. At least one side of the valve (3) is provided with a slow-shut part (8) corresp valve plate (6) and a right semicircular valve plate (11) are positioned on the valve shaft (5) in a door hinge state. At least one side of the valve (3) is provided with a slow-shut part (8) corresponding to the left semicircular valve plate (6) or the right semicircular valve plate (11). The double-plate slow-shut check valve has the characteristics of large excess flow, small resistance to watonding to the left semicircular valve plate (6) or the right semicircular valve plate (11). The double-plate slow-shut check valve has the characteristics of large excess flow, small resistance to water-flow, low shutting noise and a shut-slowing function that can eliminate destructive water hammer, and can be applied to pipe outlets of an irrigation and drainage pumping station and arranged in coer-flow, low shutting noise and a shut-slowing function that can eliminate destructive water hammer, and can be applied to pipe outlets of an irrigation and drainage pumping station and arranged in common pipe network system.mmon pipe network system.

Description

technical field [0001] The invention relates to a non-return valve, in particular to a valve which can be applied to the pipeline outlet of the irrigation and drainage pumping station and can also be installed in the ordinary pipeline network system, and is used to prevent the reverse flow of the medium after the pump is stopped, so that the valve can be closed quickly to produce destructive water hammer. Double-plate slow-closing check door. technical background [0002] At present, the valves of domestic and external irrigation and drainage pumping stations are generally of swing-hung and side-turning structures. Although these flap valves have also played a role in preventing flood backflow and protecting farms and towns for a long time, they have the disadvantages of small opening and large energy consumption. Disadvantages, in particular, are no effective slow-closing mechanisms for this type of flapper valve. With the investment in national water conservancy construc...

AI Technical Summary

Problems solved by technology

With the investment in national water conservancy construction, there are more and more large-scale and large-diameter drainage pumping stations, and more and more pumping stations are installed with more than ten or even dozens of drainage pipes on a dam, and the diameter even reaches 5M. In the event of abnormal power outages such as lightning strikes and shutdowns, multiple flap valves will be closed quickly at one time, which will generate a strong water hammer impact, which will cause great harm to the safety performance and service life of the dam.

Existing flapper valves also produce loud noise when closing the valve under normal shutdown conditions

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