CN108942155B - Pressure deformation adjusting process method for metal sealing surface of large ball valve of water turbine - Google Patents
Pressure deformation adjusting process method for metal sealing surface of large ball valve of water turbine Download PDFInfo
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- CN108942155B CN108942155B CN201811023838.7A CN201811023838A CN108942155B CN 108942155 B CN108942155 B CN 108942155B CN 201811023838 A CN201811023838 A CN 201811023838A CN 108942155 B CN108942155 B CN 108942155B
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Abstract
The invention discloses a pressure deformation adjusting process method for a metal sealing surface of a large ball valve of a water turbine. In the process of assembling the metal seal of the large ball valve, after the fixed seal seat and the valve are assembled together, the water pressure of a seal cavity between the movable seal ring of the ball valve and the connecting flange is increased to 0.5Mpa, and then the handle bolt on the valve seal seat is pre-tightened, so that the metal seal surface generates micro-size deformation, and the seal contact point between the fixed seal ring and the movable seal ring is tightly attached. The problem that the metal sealing surface of a large ball valve cannot be subjected to micro-adjustment is solved, the sealing water leakage is ensured, and the product quality of ball valve assembly and sealing leakage test is improved.
Description
Technical Field
The invention relates to the field of a pressure deformation adjusting process for a metal sealing surface of a large valve body of a water turbine.
Background
The existing assembly method is to assemble the metal seal on a valve, pre-tighten the valve by using a bolt and then perform a ball valve test. The existing assembly technology of the metal seal of the ball valve is directly assembled according to a non-deformation theory, does not reflect the actual theoretical condition of the design deformation of the metal seal surface of the ball valve, and has the phenomena of incorrect contact point of the metal seal surface and large water leakage of the seal.
Disclosure of Invention
The invention discloses a pressure deformation adjusting process method for a metal sealing surface of a large ball valve of a water turbine, which optimizes the assembly method of the metal sealing surface of the ball valve and improves the assembly precision of the metal sealing surface of the ball valve.
The technical scheme of the invention is as follows: a pressure deformation adjusting process method for a metal sealing surface of a large ball valve of a water turbine comprises the following process steps:
(1) the fixed sealing seat and the valve are assembled together, assembling fastening bolts are symmetrically and uniformly distributed by using a special torque wrench, and the fastening bolts are pre-tightened by using 40% of theoretical pre-tightening force;
(2) after the movable sealing ring is arranged in the inner cavity of the valve body, the connecting flange is assembled;
(3) flushing water into a sealing cavity between the movable sealing ring and the connecting flange, and keeping the water pressure to be less than 0.1MPa after the water is filled, so that the sealing surface of the movable sealing ring slowly contacts the sealing surface of the fixed sealing seat, and the gap between the sealing surfaces of the movable sealing ring and the fixed sealing seat is 0 mm;
(4) boosting the pressure of water filled in a sealing cavity between the movable sealing ring and the connecting flange to 0.5 MPa;
(5) tightening bolts are symmetrically and uniformly distributed by using a special torque wrench, and the tightening bolts between the fixed sealing seat and the valve are pre-tightened by using 71 percent of theoretical pre-tightening force;
(6) reducing the water pressure in a sealing cavity between the movable sealing ring and the connecting flange to 0 MPa;
(7) tightening bolts are symmetrically and uniformly distributed by using a special torque wrench, 71 percent of theoretical pretightening force is reused for loosening the tightening bolts between the fixed sealing seat and the valve, and the bolts cannot rotate;
(8) boosting the water filled in the sealing cavity between the movable sealing ring and the connecting flange to 0.5MPa again;
(9) filling a sealing cavity between the valve and the valve body with water, and increasing the pressure to 0.5 MPa;
(10) keeping the pressure value of a sealing cavity between the movable sealing ring and the connecting flange to be 1 MPa;
(11) tightening bolts are symmetrically and uniformly distributed by using a special torque wrench, and 100% of theoretical pretightening force is used for pretightening the tightening bolts between the fixed sealing seat and the valve;
(12) reducing the pressure in a sealing cavity between the valve and the valve body to 0MPa, and draining water;
(13) reducing the pressure in a sealing cavity between the movable sealing ring and the connecting flange to 0 MPa;
(14) tightening bolts are symmetrically and uniformly distributed by using a special torque wrench, 101% of theoretical pretightening force is reused for loosening the tightening bolts between the fixed sealing seat and the valve, and the bolts cannot rotate.
The invention has the following technical difficulties in the adjusting process:
(1) and (3) determining the pressure value in the sealing cavity of the movable sealing ring: the pressure value in the sealing cavity of the movable sealing ring determines the magnitude of an external force value applied to the surface of the fixed sealing seat by the movable sealing ring.
(2) And (3) determining the pressure value in the sealing cavity between the valve and the valve body: the determination of the pressure value in the sealing cavity between the valve and the valve body can reflect the micro deformation trend of the valve and the fixed sealing seat.
(3) Determining the pretightening force of the fastening bolt: the fixed sealing seat can be in the best stress position by determining the pretightening force of the closing bolt.
The invention has the following technical effects:
(1) the fixed sealing seat is assembled with the valve, and the gap between the fixed sealing seat and the periphery of the valve is adjusted to be uniform; the assembling bolts are symmetrically and uniformly distributed by using a special torque wrench, and the assembling bolts are pre-tightened by using 40% of theoretical pre-tightening force, so that the accuracy of the initial installation position degree of the fixed seal seat is ensured.
(2) After the movable sealing ring is arranged in the inner cavity of the valve body, the connecting flange is assembled to form a sealing cavity.
(3) Flushing water into a sealing cavity between the movable sealing ring and the connecting flange, keeping the water pressure less than 0.1MPa after the water is filled, and slowly moving the movable sealing ring and automatically adjusting the central position; the sealing surface of the movable sealing ring is slowly contacted with the sealing surface of the fixed sealing seat, and a clearance between the sealing surfaces of the movable sealing ring and the fixed sealing seat is checked by a 0.02mm feeler gauge, wherein the clearance is 0 mm.
(4) And boosting the pressure of water filled in a sealing cavity between the movable sealing ring and the connecting flange to 0.5MPa, and applying external force to the surface of the fixed sealing seat.
(5) Under the condition that the surface of the fixed sealing seat bears external force, tightening bolts are symmetrically and uniformly distributed by using a special torque wrench, and 70% of theoretical pretightening force is used for pretightening the tightening bolts between the fixed sealing seat and the valve, so that the mounting position accuracy of the fixed sealing seat in a stressed state is ensured.
(6) The water pressure in the sealing cavity between the movable sealing ring and the connecting flange is reduced to 0MPa, so that the surface of the fixed sealing seat does not bear external force.
(7) Under the condition that the surface of the fixed sealing seat does not bear external force, tightening bolts are symmetrically and uniformly distributed by using a special torque wrench, 71% of theoretical pretightening force is used again to loosen the tightening bolts between the fixed sealing seat and the valve, the bolts cannot rotate, and the total stress of the fixed sealing seat is larger than 70% of the theoretical pretightening force of the tightening bolts.
(8) And boosting the pressure of the water filled in the sealing cavity between the movable sealing ring and the connecting flange to 0.5MPa again, and applying external force to the surface of the fixed sealing seat.
(9) And filling water into a sealing cavity between the valve and the valve body, and increasing the pressure to 0.5MPa to enable the valve to bear the internal pressure, so that the valve and the fixed sealing seat generate micro deformation together.
(10) And keeping the pressure value of a sealing cavity between the movable sealing ring and the connecting flange to be 1MPa, so that the original external force value borne by the surface of the fixed sealing seat is unchanged.
(11) Tightening bolts are symmetrically and uniformly distributed by using a special torque wrench, and 100% of theoretical pretightening force is used for pretightening the tightening bolts between the fixed sealing seat and the valve, so that the accuracy of the installation position of the fixed sealing seat under the stressed state of the valve is ensured.
(12) And reducing the pressure in a sealing cavity between the valve and the valve body to 0MPa, and draining water to ensure that the valve does not bear the internal pressure.
(13) And reducing the pressure in a sealing cavity between the movable sealing ring and the connecting flange to 0MPa, so that the surface of the fixed sealing seat does not bear external force.
(14) Tightening bolts are symmetrically and uniformly distributed by using a special torque wrench, the tightening bolts between the fixed sealing seat and the valve are loosened by using 101% of theoretical pretightening force again, the bolts cannot rotate, namely the total stress of the fixed sealing seat is larger than 100% of theoretical pretightening force of the tightening bolts.
The invention adopts a pressure deformation adjustment process method to assemble the fixed seal seat to the position of theoretical design deformation, solves the problem that the fixed seal seat can not be assembled according to the designed theoretical position, and ensures the assembly quality of the metal seal surface of the ball valve.
The invention provides a pressure deformation adjusting process method for a metal sealing surface of a large ball valve of a water turbine, which solves the problem that a fixed sealing seat cannot be assembled according to a designed theoretical position. The metal sealing surface adopts a process concept of pressure deformation adjustment assembly, is an implementation method for assembling all parts according to a design theory, and provides a reference method for assembling parts with similar structures.
Drawings
FIG. 1 schematic view of the assembly of metal seal faces
FIG. 2 is a schematic diagram of a pre-tightening sequence of a fastening bolt
Detailed Description
(1) The fixed sealing seat 3 and the valve 2 are assembled together, and the gap between the fixed sealing seat and the periphery of the valve is adjusted to be uniform, as shown in figure 1; a special torque wrench is used, the first combination bolt 4, the second combination bolt 5, the third combination bolt 6, the fourth combination bolt 7, the fifth combination bolt 8, the sixth combination bolt 9, the seventh combination bolt 10 and the eighth combination bolt 11 are symmetrically and uniformly assembled in sequence and pre-tightened by 40% of theoretical pretightening force, the fixed seal seat 3 is assembled on the valve 2, and the accuracy of the initial installation position degree of the fixed seal seat 3 is guaranteed, and the figure 2 shows.
(2) After the movable sealing ring 13 is arranged in the inner cavity of the valve body 1, the connecting flange 12 is assembled to form a sealing cavity, which is shown in figure 1.
(3) Flushing water into a sealing cavity between the movable sealing ring 13 and the connecting flange 12, and after the water is filled, keeping the water pressure to be less than 0.1MPa, and slowly moving and automatically adjusting the central position of the movable sealing ring 13; the sealing surface of the movable sealing ring 13 is slowly contacted with the sealing surface of the fixed sealing seat 3, and a clearance between the sealing surfaces of the movable sealing ring 13 and the fixed sealing seat 3 is checked by a 0.02mm feeler gauge, wherein the clearance is 0mm, as shown in figure 1.
(4) The pressure of the water filled in the sealing cavity between the movable sealing ring 13 and the connecting flange 12 is increased to 0.5MPa, and external force is applied to the surface of the fixed sealing seat 3, as shown in figure 1.
(5) Under the condition that the surface of the fixed sealing seat 3 bears external force, a special torque wrench is used for symmetrically and uniformly assembling and pre-tightening a first closing bolt 4, a second closing bolt 5, a third closing bolt 6, a fourth closing bolt 7, a fifth closing bolt 8, a sixth closing bolt 9, a seventh closing bolt 10 and an eighth closing bolt 11 by using 70% of theoretical pre-tightening force in sequence, the fixed sealing seat 3 is assembled on the valve 2, and the accuracy of the installation position degree of the fixed sealing seat 3 in a stressed state is guaranteed, see fig. 2.
(6) The water pressure in the sealing cavity between the movable sealing ring 13 and the connecting flange 12 is reduced to 0MPa, so that the surface of the fixed sealing seat 3 does not bear external force, and the fixed sealing seat 3 is restored to a pre-tightening state, as shown in figure 1.
(7) Under the condition that the surface of the fixed sealing seat 3 does not bear external force, a special torque wrench is used for symmetrically and uniformly assembling the fixed sealing seat 3 and the valve 2 in sequence, 71% of theoretical pretightening force is used for loosening a first closing bolt 4, a second closing bolt 5, a third closing bolt 6, a fourth closing bolt 7, a fifth closing bolt 8, a sixth closing bolt 9, a seventh closing bolt 10 and an eighth closing bolt 11 between the fixed sealing seat 3 and the valve 2, the closing bolts cannot rotate, namely the actual pretightening force of the closing bolts on the fixed sealing seat 3 is larger than 70% of the theoretical pretightening force of the closing bolts, and the view in fig. 2 shows that the actual pretightening force of the closing bolts on the fixed sealing seat 3 is larger than the.
(8) The pressure of the water filled in the sealing cavity between the movable sealing ring 13 and the connecting flange 12 is increased to 0.5MPa again, and external force is applied to the surface of the fixed sealing seat 3, as shown in figure 1.
(9) The sealed cavity between the valve 2 and the valve body 1 is filled with water and the pressure is increased to 0.5MPa, so that the valve 2 bears the internal pressure, and the valve 2 and the fixed sealing seat 3 generate micro deformation together, as shown in figure 1.
(10) The pressure value of the sealing cavity between the movable sealing ring 13 and the connecting flange 12 is kept to be 1MPa, so that the original external force value borne by the surface of the fixed sealing seat 3 is unchanged, as shown in figure 1.
(11) A special torque wrench is used, a first closing bolt 4, a second closing bolt 5, a third closing bolt 6, a fourth closing bolt 7, a fifth closing bolt 8, a sixth closing bolt 9, a seventh closing bolt 10 and an eighth closing bolt 11 are symmetrically and uniformly assembled in sequence and pre-tightened by 100% of theoretical pretightening force, a fixed sealing seat 3 is assembled on a valve 2, and the accuracy of the installation position of the fixed sealing seat 3 in the stressed state of the valve 2 is guaranteed, and the figure 2 shows.
(12) The pressure in the sealed cavity between the valve 2 and the valve body 1 is reduced to 0MPa, and water is drained, so that the valve does not bear the internal pressure, as shown in figure 1.
(13) The pressure in the sealing cavity between the movable sealing ring 13 and the connecting flange 12 is reduced to 0MPa, so that the surface of the fixed sealing seat 3 does not bear external force, as shown in fig. 1.
(14) Under the condition that the surface of the fixed sealing seat 3 does not bear external force, a special torque wrench is used for symmetrically and uniformly assembling the fixed sealing seat 3 and the valve 2 in sequence, 101% of theoretical pretightening force is used for loosening a first closing bolt 4, a second closing bolt 5, a third closing bolt 6, a fourth closing bolt 7, a fifth closing bolt 8, a sixth closing bolt 9, a seventh closing bolt 10 and an eighth closing bolt 11 between the fixed sealing seat 3 and the valve 2, the closing bolts cannot rotate, namely the actual pretightening force of the closing bolts on the fixed sealing seat 3 is larger than 101% of the theoretical pretightening force of the closing bolts, and the view in fig. 2 shows that the actual pretightening force of the closing bolts on the fixed sealing seat 3 is larger than the.
Equipment is needed:
special torque wrench
Pressure pump
The invention provides a pressure deformation adjusting process method for a metal sealing surface of a large ball valve of a water turbine, which solves the problem that a fixed sealing seat cannot be assembled according to a designed theoretical position. The metal sealing surface adopts a process concept of pressure deformation adjustment assembly, is an implementation method for assembling all parts according to a design theory, and provides a reference method for assembling parts with similar structures.
Claims (1)
1. A pressure deformation adjusting process method for a metal sealing surface of a large ball valve of a water turbine is characterized by comprising the following steps: the method comprises the following process steps:
(1) the fixed sealing seat and the valve are assembled together, assembling fastening bolts are symmetrically and uniformly distributed by using a special torque wrench, and the fastening bolts are pre-tightened by using 40% of theoretical pre-tightening force;
(2) after the movable sealing ring is arranged in the inner cavity of the valve body, the connecting flange is assembled;
(3) flushing water into a sealing cavity between the movable sealing ring and the connecting flange, and keeping the water pressure to be less than 0.1MPa after the water is filled, so that the sealing surface of the movable sealing ring slowly contacts the sealing surface of the fixed sealing seat, and the gap between the sealing surfaces of the movable sealing ring and the fixed sealing seat is 0 mm;
(4) boosting the pressure of water filled in a sealing cavity between the movable sealing ring and the connecting flange to 0.5 MPa;
(5) tightening bolts are symmetrically and uniformly distributed by using a special torque wrench, and the tightening bolts between the fixed sealing seat and the valve are pre-tightened by using 70% of theoretical pre-tightening force;
(6) reducing the water pressure in a sealing cavity between the movable sealing ring and the connecting flange to 0 MPa;
(7) tightening bolts are symmetrically and uniformly distributed by using a special torque wrench, 71 percent of theoretical pretightening force is used again to loosen the tightening bolts between the fixed sealing seat and the valve, and the bolts cannot rotate;
(8) boosting the water filled in the sealing cavity between the movable sealing ring and the connecting flange to 0.5MPa again;
(9) filling a sealing cavity between the valve and the valve body with water, and increasing the pressure to 0.5 MPa;
(10) keeping the pressure value of a sealing cavity between the movable sealing ring and the connecting flange to be 1 MPa;
(11) tightening bolts are symmetrically and uniformly distributed by using a special torque wrench, and 100% of theoretical pretightening force is used for pretightening the tightening bolts between the fixed sealing seat and the valve;
(12) reducing the pressure in a sealing cavity between the valve and the valve body to 0MPa, and draining water;
(13) reducing the pressure in a sealing cavity between the movable sealing ring and the connecting flange to 0 MPa;
(14) and tightening bolts are symmetrically and uniformly distributed by using a special torque wrench, 101% of theoretical pretightening force is used again to loosen the tightening bolts between the fixed sealing seat and the valve, and the bolts do not rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811023838.7A CN108942155B (en) | 2018-09-04 | 2018-09-04 | Pressure deformation adjusting process method for metal sealing surface of large ball valve of water turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811023838.7A CN108942155B (en) | 2018-09-04 | 2018-09-04 | Pressure deformation adjusting process method for metal sealing surface of large ball valve of water turbine |
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| CN108942155A CN108942155A (en) | 2018-12-07 |
| CN108942155B true CN108942155B (en) | 2020-04-14 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61203237A (en) * | 1985-03-04 | 1986-09-09 | Caterpillar Mitsubishi Ltd | Judging method for quality of parts to be press-fitted |
| CN102748038A (en) * | 2012-07-11 | 2012-10-24 | 上海盾构设计试验研究中心有限公司 | Full-recovery shield tunnel enter and exit water stop device |
| CN102879156A (en) * | 2012-09-17 | 2013-01-16 | 中国石油大学(北京) | Sealing pressure test method for O-shaped seal rings and sealing device for O-shaped seal rings |
| CN104132780A (en) * | 2014-08-01 | 2014-11-05 | 洛阳隆华传热节能股份有限公司 | Directional press-fit single pipe leakage testing working device and detecting method thereof |
| CN105004520A (en) * | 2015-08-18 | 2015-10-28 | 哈尔滨电机厂有限责任公司 | Ball valve test pressure stress measuring process method |
| US9939070B2 (en) * | 2014-11-26 | 2018-04-10 | Hydac Accessories Gmbh | Valve device, use of such a valve device and associated sealing device |
-
2018
- 2018-09-04 CN CN201811023838.7A patent/CN108942155B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61203237A (en) * | 1985-03-04 | 1986-09-09 | Caterpillar Mitsubishi Ltd | Judging method for quality of parts to be press-fitted |
| CN102748038A (en) * | 2012-07-11 | 2012-10-24 | 上海盾构设计试验研究中心有限公司 | Full-recovery shield tunnel enter and exit water stop device |
| CN102879156A (en) * | 2012-09-17 | 2013-01-16 | 中国石油大学(北京) | Sealing pressure test method for O-shaped seal rings and sealing device for O-shaped seal rings |
| CN104132780A (en) * | 2014-08-01 | 2014-11-05 | 洛阳隆华传热节能股份有限公司 | Directional press-fit single pipe leakage testing working device and detecting method thereof |
| US9939070B2 (en) * | 2014-11-26 | 2018-04-10 | Hydac Accessories Gmbh | Valve device, use of such a valve device and associated sealing device |
| CN105004520A (en) * | 2015-08-18 | 2015-10-28 | 哈尔滨电机厂有限责任公司 | Ball valve test pressure stress measuring process method |
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