A method for adjusting the pressure deformation of the metal sealing surface of a large ball valve of a hydraulic turbine
A metal sealing and surface pressure technology, applied in metal processing, metal processing equipment, manufacturing tools, etc., can solve the problems of incorrect contact point of metal sealing surface, large leakage of sealing water, non-responsive ball valve metal sealing surface, etc., to achieve optimization The effect of the assembly method
Active Publication Date: 2020-04-14
HARBIN ELECTRIC MASCH CO LTD
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Problems solved by technology
The existing assembly technology of the metal seal of the ball valve is directly assembled according to the theory of no deformation, which does not reflect the actual theoretical situation of the design deformation of the metal sealing surface of the ball valve, and there are phenomena of incorrect contact points of the metal sealing surface and large leakage of sealing water
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Embodiment Construction
[0042] (1) The fixed seal seat 3 is assembled with the valve 2, and the gap between the fixed seal seat and the valve is adjusted evenly, see figure 1 ;Use a special torque wrench, assemble symmetrically and evenly in sequence, and pre-tighten the first closing bolt 4, the second closing bolt 5, the third closing bolt 6, the fourth closing bolt 7, The fifth closing bolt 8, the sixth closing bolt 9, the seventh closing bolt 10 and the eighth closing bolt 11 assemble the fixed sealing seat 3 on the valve 2 to ensure the accuracy of the initial installation position of the fixed sealing seat 3 ,See figure 2 .
[0043] (2) After installing the movable sealing ring 13 into the inner cavity of the valve body 1, assemble the connecting flange 12 to form a sealing cavity, see figure 1 .
[0044] (3) Flush water into the sealing chamber between the movable sealing ring 13 and the connecting flange 12. After the water is full, keep the water pressure less than 0.1MPa, and the movabl...
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The invention discloses a technological method for adjusting pressure deformation of a metal seal surface of a large ball valve of a water turbine. In the assembly process of a metal seal of the largeball valve, after a fixed sealing seat and a valve are assembled together, the water pressure of a sealing cavity between a ball valve moving sealing ring and a connecting flange is increased to 0.5Mpa, and then occluding bolts on a valve sealing seat are pre-tightened, so that the metal seal surface has the trace size deformation, and sealing contact points between the fixed sealing ring and the moving sealing ring are attached closely. The problem that micro-adjustment of the metal seal surface of the large ball valve cannot be realized is solved, the seal water leakage amount is guaranteed, and the product quality of ball valve assembly and seal leakage tests is improved.
Description
technical field [0001] The invention relates to the technical field of pressure deformation adjustment on the metal sealing surface of a large valve body of a water turbine. Background technique [0002] Assembling the metal seal of the water turbine ball valve, the existing assembly method is to assemble the metal seal on the valve, pre-tighten it with the closing bolt, and then carry out the ball valve test. The existing assembly technology of the ball valve metal seal is directly assembled according to the theory of no deformation, which does not reflect the actual theoretical situation of the design deformation of the metal sealing surface of the ball valve, and there are phenomena such as incorrect contact points of the metal sealing surface and large leakage of sealing water. Contents of the invention [0003] The invention discloses a process method for adjusting the pressure deformation of the metal sealing surface of a large ball valve of a water turbine, optimize...
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IPC IPC(8): B23P19/00
CPCB23P19/00
Inventor 姜国华陈杰凤雒军红吴志超
Owner HARBIN ELECTRIC MASCH CO LTD