Lifting check-valve leakage detecting device and detecting method
A sealing detection and check valve technology, which is used in the liquid/vacuum degree of liquid tightness measurement, and by measuring the fluid's acceleration and deceleration rate, etc., can solve the problem of roughness, power station time and economic loss, and judgment of blue oil coating layer. different results
Inactive Publication Date: 2008-11-12
DAYA BAY NUCLEAR POWER OPERATIONS & MANAGEMENT
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Problems solved by technology
[0004] The lifting check valve needs to be regularly tested for its sealing performance during use, but there are usually the following shortcomings in the testing of the lifting check valve: the lifting check valve is usually welded and fixed in the system pipeline, and the sealing performance test serious shortage of means
However, this blue oil test method can only make a rough evaluation of the condition of the sealing surface, but cannot accurately measure the sealing performance of the sealing surface, and it is also due to the thickness of the blue oil smear layer and the experience of the maintenance personnel. results vary
Therefore, the detection accuracy of the blue oil test cannot meet the high rigor requirements of the nuclear power plant, and the internal leakage is prone to exceed the standard after the maintenance, causing some regular tests of the power plant to fail, and there are nuclear safety hazards, and it must be dismantled and repaired again
As a result, the state of the unit was forced to retreat, which brought significant time and economic losses to the power station
Method used
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[0022] Such as figure 2 and image 3 As shown, the lift check valve sealing detection device of the present invention includes a sealing plug 1 , a pressure pump 2 , an exhaust valve 3 and corresponding pipelines 4 .
[0023] Wherein, the sealing plug 1 is columnar, and the outer wall of the lower end is provided with an external thread 11, which can be sealed and installed in the valve body 7 of the lifting check valve at the position where the valve cover is originally installed by screw connection. The sealing plug 1 has a cavity 12 inside, and a water inlet 13 and an exhaust port 14 are opened on the wall of the cavity. A sealing ring 15 is also embedded on the bottom surface of the sealing plug 1 , and in this embodiment, the sealing ring 15 is an O-shaped sealing ring.
[0024] The pressure pump 2 can be a manual pressure pump. It is mainly used to inject water into the sealed space enclosed by the sealing plug 1 .
[0025] The vent valve 3 is mounted at the vent op...
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The lifting check valve leakage detecting device includes one sealing plug, one pressurizing pump, one exhaust valve and corresponding pipeline. The cylindrical sealing plug is set inside the lifting check valve to replace its valve cap and has one inside cavity with water inlet port and air exhaust port; the pipeline has one end connected to the water inlet port of the sealing plug and the other end connected to the pressurizing pump; and the exhaust valve is set outside the air exhaust port of the sealing plug. The lifting check valve leakage detecting method during overhaul includes mounting the detecting device after relocating the valve clack, pressurizing detection of the sealed cavity and evaluation of the overhaul quality. The present invention performs quantitative on-line detection of the sealing performance of lifting check valve in high precision.
Description
【Technical field】 [0001] The invention relates to a check valve seal detection device and a detection method, in particular to a lifting check valve seal detection device and detection method. 【Background technique】 [0002] In nuclear safety-related systems of nuclear power plants, lift check valves are widely used as a boundary isolation valve. [0003] Such as figure 1 Shown is a sectional view of an existing lifting check valve, which includes a valve body 7', a valve cover 8', and a valve disc 9', wherein the valve cover 8' It is connected to the upper end of the valve body 7' and has a receiving space inside. The valve clack 9' is installed in the valve body 7', and its top is accommodated in the receiving space of the valve cover 8'. [0004] The lifting check valve needs to be regularly tested for its sealing performance during use, but there are usually the following shortcomings in the testing of the lifting check valve: the lifting check valve is usually welded ...
Claims
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IPC IPC(8): G01M3/28
Inventor 蒲俊春雷合成
Owner DAYA BAY NUCLEAR POWER OPERATIONS & MANAGEMENT