Method for closing check valve at zero flow speed and closing device
A closing device and check valve technology, applied in the field of method and closing device, check valve zero flow rate closing, can solve the problems of reducing the service life and impact of equipment, and achieve the effect of eliminating the impact of pump stop water hammer
Active Publication Date: 2021-07-23
BENSV VALVE CO LTD
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[0029] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0030] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be understood ...
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The invention provides a method for closing a check valve at the zero flow speed. The method comprises the following steps that S1, the check valve is installed on a pipeline joint; S2, the periphery of a rotating shaft of the check valve is sleeved with an eccentric structure, and the rotating displacement of the rotating shaft of the check valve is converted into linear displacement through the eccentric structure; S3, an opening and closing elastic device used for buffering the check valve is fixedly installed on the periphery of the eccentric structure; S4, the interior of the elastic device is connected into a pipeline through a water pipe, and the water inlet end of the water pipe is located on the downstream portion of the check valve; S5, an opening and closing center line of the elastic device is adjusted; and S6, a pressure release valve used for preventing water flow impact is installed on the check valve. According to the method for closing the check valve at the zero flow speed, the downstream portion of the check valve and the elastic device are connected in series through the water pipe to form a mechanism for actively tracking the flow speed of a medium in the pipeline, the check valve is gradually closed at the zero flow speed of the medium through the pressure of the medium in the pipeline and rotation fit of the rotating shaft of the valve, the influence of a pump stopping water hammer is eliminated, and the medium does not flow back.
Description
technical field [0001] The invention belongs to the field of check valves, and in particular relates to a zero-flow-velocity closing method and a closing device of a check valve. Background technique [0002] There are two main types of existing pump control valves. One is slow-closing check valves, mainly hydraulically controlled butterfly valves and hemispherical valves, which are closed in two stages. The reverse flow will cause the water pump to reverse. At the same time, if the system is equipped with a water hammer elimination tank, the pressure water in the water hammer elimination tank will also flow back, reducing the effectiveness of the water hammer elimination tank. The second type is the quick-closing check valve, which is not a good choice for water hammer caused by quick closing. According to the water hammer theory, the timing of the check valve closing is when the flow rate of the medium is zero. If the valve is closed synchronously, there will be no water ...
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IPC IPC(8): F16K15/03F16K37/00F16K31/122F16K1/22F16K1/36F16K1/48F16K47/08
CPCF16K15/03F16K37/0016F16K31/122F16K1/22F16K1/36F16K1/48F16K47/08
Inventor 何锐王学攀王东辉洪炳达
Owner BENSV VALVE CO LTD