CN110332331B - Eccentric full-bore ball valve with asymmetric sealing structure - Google Patents
Eccentric full-bore ball valve with asymmetric sealing structure Download PDFInfo
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- CN110332331B CN110332331B CN201910689110.6A CN201910689110A CN110332331B CN 110332331 B CN110332331 B CN 110332331B CN 201910689110 A CN201910689110 A CN 201910689110A CN 110332331 B CN110332331 B CN 110332331B
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- 238000007789 sealing Methods 0.000 title claims abstract description 138
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000002184 metal Substances 0.000 claims abstract description 24
- 229920001971 elastomer Polymers 0.000 claims description 23
- 230000033001 locomotion Effects 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 10
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 229920002943 EPDM rubber Polymers 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 17
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
- F16K5/0663—Packings
- F16K5/0689—Packings between housing and plug
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/08—Details
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Taps Or Cocks (AREA)
Abstract
The invention discloses an eccentric full-diameter ball valve with an asymmetric sealing structure, which comprises a valve body, a valve, a movable differential pressure type metal hard sealing structure, a fixed soft sealing structure, a crank arm and a manual spindle locking device, wherein the crank arm outside the valve body is arranged at the water inlet end of the ball valve, the fixed soft sealing structure is arranged at the water outlet end of the ball valve, the center line of a valve shaft is offset with the center line of the valve body by a certain distance in parallel, the crank arm is connected with the valve in the valve body through the valve shaft so as to drive the valve to rotate, and when the valve is in a full-opening or full-closing state, the manual spindle locking device arranged on the crank arm can be pulled out and put in two locking pin sleeves arranged on the valve body. Compared with the prior art, the eccentric full-bore ball valve has the advantages of simple structure and operation, high sealing maintenance speed, low manufacturing and using cost, strong sealing performance and no influence on the continuous work of the ball valve during on-line maintenance.
Description
Technical Field
The invention relates to the field of valve sealing, in particular to an eccentric full-diameter ball valve with an asymmetric sealing structure.
Background
In the full-diameter ball valve, the traditional manual and electric ball valve is free from eccentricity, the valve is in a casting or steel plate welding mode, the valve and the movable ring form a sealing pair (metal-to-metal hard seal) through the installation of a valve sealing ring, and the sealing consists of an upstream working sealing pair and a downstream maintenance sealing pair. The two sealing pairs are used for realizing the opening and closing of the ball valve by throwing and pulling out the movable ring driven by pressure water or pressure oil, and the ball valve with the movable differential pressure type metal hard sealing structure which is symmetrically arranged has already appeared in the prior art, for example, the movable differential pressure type metal hard sealing structure of the double-sealing ball valve is disclosed in Chinese patent application numbers CN201820980822 and CN 200420076986.2. However, because the water system or the oil system of the movable differential pressure type metal hard sealing structure is in a one-to-one relationship with the ball valve, the control mode and the structure are complex, the manufacturing and using costs are high, the metal hard sealing is difficult to realize zero leakage, and when problems occur in a manual electric device or a transmission device, a sealing structure and the like, the maintenance needs to be disassembled for a long time, the continuous normal working time of the ball valve can not be ensured, and the utilization rate of the ball valve is influenced.
Therefore, it is highly desirable to design a full-bore ball valve that is simpler in structure, easier to seal and repair, and lower in manufacturing and use costs, while being able to ensure the sealability and operability of the valve.
Disclosure of Invention
First, the technical problem to be solved
Based on the structure, the eccentric full-diameter ball valve with the asymmetric sealing structure is simple in structure and operation, high in sealing maintenance speed, low in manufacturing and using cost and high in sealing performance, and continuous operation of the ball valve is not affected during online maintenance.
(II) technical scheme
In order to solve the technical problems, the invention provides an eccentric full-drift diameter ball valve with an asymmetric sealing structure, which comprises a valve body, a valve, a movable differential pressure type metal hard sealing structure, a fixed type soft sealing structure, a crank arm outside the valve body and a manual spindle locking device, wherein the movable differential pressure type metal hard sealing structure is arranged at the water inlet end of the ball valve, the fixed type soft sealing structure is arranged at the water outlet end of the ball valve, the center line of the valve shaft is offset with the center line of the valve body by a certain distance in parallel, the crank arm is connected with the valve in the valve body through the valve shaft so as to drive the valve to rotate, and when the valve is in a full-opening or full-closing state, the manual spindle locking device arranged on the crank arm can be pulled out and put in two locking pin sleeves arranged on the valve body.
Further, the movable differential pressure type metal hard sealing structure comprises a valve sealing ring fixed on the valve through screws, a movable ring which moves linearly and a supporting ring fixed on the valve body, water inlet and outlet ports connected to a water system are respectively formed in the valve body, the movable ring is movably arranged between the valve body and the supporting ring, the valve sealing ring, the supporting ring and the valve body which are matched with the conical surface of the movable ring form a space for placing the movable ring, and the water inlet and outlet ports respectively formed in the supporting ring and the valve body are communicated with the space for placing the movable ring.
Further, the fixed soft sealing structure comprises a fixed sealing seat fixed on the valve body and a rubber sealing ring fixed on the valve, and the fixed sealing seat and the rubber sealing ring can be tightly matched to form a pair of working sealing pairs.
Further, the fixed soft sealing structure further comprises a pressing ring, the rubber sealing ring is fixed in a groove on the valve through the pressing ring and a screw below, and the rubber sealing ring can adjust the compression amount through the pressing ring so as to ensure zero leakage.
Further, the valve shaft center line and the valve body center line are offset in parallel in the vertical direction by a certain distance, so that an eccentric distance in the vertical direction is formed.
Further, the length of the eccentricity is 1-10mm.
Furthermore, the fixed sealing seat is made of stainless steel, and the rubber sealing ring is made of NBR or EPDM.
Further, manual lock spindle device includes the hand wheel, with the lead screw, lock nut, bolt, dog, apron of hand wheel connection and set up the locking pin in the fixing base on the crank arm, the apron passes through the one end of bolt fastening on the fixing base, is equipped with the screw hole on the apron, the screw hole constitutes a lead screw nut structure with the lead screw cooperation, when the valve is in full open or close the state entirely, the locking pin can be pulled out and put into in two locking pin cover that set up on the valve body, adopt conical surface structural fit between locking pin and the locking pin cover.
Further, the manual spindle locking device further comprises a stop block, the stop block is fixedly connected with the inner thread of the groove formed in the tail portion of the locking pin through the outer thread in a threaded mode, the tail end of the screw rod is of a circular truncated cone-shaped structure, the stop block is used for limiting the circular truncated cone-shaped structure to conduct linear motion, and the circular truncated cone-shaped structure can conduct free rotation in the groove formed in the tail portion of the locking pin.
Further, the manual spindle locking device further comprises a positioning rod and a positioning rod nut, the positioning rod is fixed on the fixing seat through the positioning rod nut, a limiting groove matched with one end of the positioning rod is formed in the side face of the locking pin, and the limiting groove limits the positioning rod to move in the horizontal direction only.
(III) beneficial effects
Compared with the prior art, the invention has the beneficial effects that:
1. The eccentric full-drift diameter ball valve with the asymmetric sealing structure changes the working sealing structure in two movable differential pressure type metal hard sealing structures (the ball valve water inlet side maintenance sealing structure and the ball valve water outlet side working sealing structure) into a fixed type soft sealing structure, so that the fixed type soft sealing structure is used as a common working sealing positioned at the downstream, the metal hard sealing structure which moves linearly is not needed under the normal working condition, the fixed type soft sealing structure does not need hydraulic or hydraulic driving, a water system or an oil system is simplified, a water system control cabinet or an oil system control cabinet does not need to be matched with the ball valve, the water system control cabinet or the oil system control cabinet can be used as a movable special tool, and the water system control cabinet can be connected with the ball valve only when the ball valve needs to be overhauled on line, thereby reducing the manufacturing cost and simplifying the control mode. In addition, when overhauling, only need the rubber seal circle of quick replacement fixed soft seal structure can accomplish seal structure's maintenance, maintenance easy operation.
2. According to the full-drift-diameter ball valve with the asymmetric sealing structure, through matching of the eccentric structure and the manual spindle locking device, the eccentric crank arm can ensure that the valve is in a full-opening or full-closing position, the moment of opening and closing is increased, and the valve sealing ring and the rubber sealing ring can be rapidly separated by increasing the eccentricity.
3. The screw rod in the manual spindle locking device on the crank arm pushes the locking pin back and forth through the clamping of the stop block and the relative rotation of the screw rod and the cover plate, the locking pin and the locking pin sleeve are matched by conical surfaces, and the locking nut and the positioning rod are matched, so that the locking pin can be accurately and stably pulled out and put into the locking pin sleeve at the upper and lower positions corresponding to the full-open and full-close positions of the valve, the full-open and full-close positions of the valve are accurate, and the conical surfaces and the limit groove at one side of the locking pin enable staff to feed back whether the locking pin is put into place or not.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and should not be construed as limiting the invention in any way, in which:
FIG. 1 is a side view of an eccentric full-bore ball valve of the asymmetric seal configuration of the present invention;
FIG. 2 is an enlarged schematic view of a portion of the portion I of FIG. 1;
FIG. 3 is an enlarged partial schematic view of the movable differential pressure type metal-to-metal seal structure for service of FIG. 1;
FIG. 4 is a schematic view of the manual mechanical locking pin of FIG. 1 in an extracted state;
fig. 5 is a schematic view of the manual mechanical locking pin of fig. 1 in an engaged state.
Reference numerals illustrate:
1. Valve body, 2, valve, 3, clamping ring, 4, rubber seal, 5, fixed seal seat, 6, valve seal, 7, movable ring, 8, support ring, 9, crank arm, 10, locking pin, 11, hand wheel, 12, locking pin sleeve, 13, lead screw, 14, lock nut, 15, bolt, 16, apron, 17, dog, 18, locating lever, 19, locating lever nut.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.
As shown in figures 1-5, the invention discloses an eccentric full-bore ball valve with an asymmetric sealing structure, which comprises a valve body 1, a valve 2, a movable differential pressure type metal hard sealing structure, a fixed soft sealing structure, a crank arm 9 and a manual spindle locking device on the crank arm, wherein the movable differential pressure type metal hard sealing structure is arranged at a water inlet end, the fixed soft sealing structure is arranged at a water outlet end, and the fixed soft sealing structure is arranged at a downstream water outlet end, so that the fixed soft sealing structure is used as a common working seal, therefore, a metal hard sealing structure which moves linearly is not required under normal working conditions, the fixed soft sealing structure is not required to be driven by water pressure or oil pressure, an operation control system is simplified, a water system control cabinet or an oil system control cabinet is not required to be matched with the ball valve, the movable special tool can be connected with the ball valve only when the ball valve needs on-line maintenance, the manufacturing cost is reduced, and the control mode is simplified. In addition, when overhauling, only need the rubber seal circle of quick replacement fixed soft seal structure can accomplish seal structure's maintenance, maintenance easy operation.
In addition, the crank arm 9 outside the valve body 1 is connected with the valve 2 in the valve body 1 through a valve shaft, so that the valve 2 is driven to rotate within a 90-degree range, the purpose of cutting off or connecting media is achieved, the center line of the valve shaft and the center line of the valve body 1 deviate by a certain distance, and an eccentric full-diameter ball valve is formed, so that the ball valve with an asymmetric sealing structure is easy to open and close, zero leakage is guaranteed by adjusting the compression amount of a compared sealing ring through a pressing ring, and finally sealing zero leakage is achieved. Preferably, as shown in fig. 1, the valve shaft connected to one end of the crank arm 9 may be vertically deviated from the center line of the valve body 1, forming a vertical eccentricity, so as to facilitate the manual or electric valve opening control by an operator in the vertical direction.
As shown in fig. 2, the fixed soft sealing structure comprises a fixed sealing seat 5 fixed on the valve body 1, a rubber sealing ring 4 fixed on the valve 2 and a pressing ring 3, wherein the rubber sealing ring 4 is fixed in a groove on the valve 2 through the pressing ring 3 positioned below and a screw, the compression amount of the rubber sealing ring is finely adjusted through the pressing ring 3, zero leakage can be ensured, and finally the fixed sealing seat 5 and the rubber sealing ring 4 can be tightly matched to form a sealing waterproof structure, so that leakage of a medium from a gap between a valve seat and the valve body is prevented, preferably, the fixed sealing seat 5 is made of stainless steel, and the sealing ring of the rubber sealing ring 4 is made of NBR, EPDM and the like, and can be selected according to use conditions.
As shown in fig. 3, the movable differential pressure type metal hard sealing structure in the prior art comprises a valve sealing ring 6 fixed on a valve 2 through screws, a movable ring 7 doing linear motion and a supporting ring 8 on a valve body 1, wherein the valve body is provided with a water inlet and a water outlet connected to a water system, the water inlet and the water outlet are respectively a pull-out cavity and a throw-in cavity, the movable ring 7 is movably arranged between a right valve body and the supporting ring 8, the valve sealing ring 6 matched with the conical surface of the movable ring 7, the supporting ring 8 and the right valve body together form a space for placing the movable ring 7, the water inlet and the water outlet respectively arranged on the supporting ring 8 and the right valve body are communicated with the space for placing the movable ring 7, a high-pressure water conduit on the valve body 1 leads pressure water or pressure oil of the water system to two ends of the movable ring 7, and the movable differential pressure type metal hard sealing structure is enabled to do linear motion in the valve body by controlling the water inlet direction of pressure water/oil at two ends of the movable differential pressure type metal hard sealing structure. When water/oil is fed into the cavity at the right end, the pressure water/oil pushing moving ring 7 moves towards the center of the valve to be contacted with the valve sealing ring 6 on the ball valve, the valve sealing ring is tightly attached to form a sealing surface, the pulling-out cavity at the left end is used as a water/oil draining port to drain the drained water/oil, otherwise, when water/oil is fed into the pulling-out cavity at the left end, the pressure water/oil pushing moving ring 7 moves towards the opposite direction of the center of the valve and is separated from the valve sealing ring 6 on the ball valve, a gap with the corresponding size is reserved, the turning arm 9 is guaranteed to drive the valve 2 to rotate in the valve body 1, and the water/oil drained from the pulling-out cavity at the right end is used as the water/oil draining port. It is worth noting that the movable differential pressure type metal hard sealing structure is used as an overhaul sealing structure, and the movable differential pressure type metal hard sealing structure is only put into operation during overhaul, so that hydraulic control equipment of a movable ring is not required to be independently arranged on each ball valve under normal working conditions.
As shown in a side view from C-C in fig. 4 to 5, in order to make the valve position of the eccentric full-diameter ball valve with an asymmetric sealing structure accurate, the invention further provides a manual spindle locking device at one end of the crank arm 9, specifically, the manual spindle locking device comprises a hand wheel 11, a screw rod 13 connected with the hand wheel, a locking nut 14, a bolt 15, a stop block 17, a positioning rod 18, a positioning rod nut 19, a cover plate 16 and a locking pin 10 arranged in a fixed seat on the crank arm, wherein the locking pin 10 can be pulled out and put in two locking pin sleeves 12 (only one locking pin sleeve 12 is shown in fig. 1) on the valve body 1, one locking pin sleeve 12 above corresponds to the fully opened position, and the other locking pin sleeve 12 below corresponds to the fully closed and sealed position of the valve with a fixed soft sealing structure, so that the sealing effect of the fixed soft sealing structure is ensured when the valve is closed, the fixed sealing seat 5 and the rubber sealing ring 4 are further tightly attached, and the opening degree of the valve is ensured when the rubber sealing ring 4 is replaced.
Further, the tail end of the screw rod 13 is in a truncated cone-shaped structure, the tail end of the locking pin 10 is provided with a groove with threads, the stop block is connected with the internal threads of the groove at the tail end of the locking pin 12 through external threads, the stop block 17 is used for clamping the truncated cone-shaped structure at the tail end of the screw rod 13 to do linear motion, so that the truncated cone-shaped structure protruding at the tail end of the screw rod 13 in the groove at the tail end of the locking pin 10 is limited, a certain small gap is reserved, the truncated cone-shaped structure of the screw rod 13 can freely rotate in the groove at the tail end of the locking pin 10, the screw rod 13 drives the truncated cone-shaped structure at the tail end of the screw rod 13 to do back and forth motion through rotation of a hand wheel, finally, the locking pin 12 is pushed to do horizontal linear motion, in addition, the cover plate 16 is fixedly arranged on a hollow fixed seat on a crank arm through a bolt 15, the center of the cover plate 16 is provided with a threaded hole, the threaded hole is matched with threads on the screw rod 13 to jointly form a screw rod nut structure, so that the screw rod 13 rotates to do back and forth motion relative to the fixed cover plate 16, in addition, a locking nut 14 can be further arranged, the center of the locking nut 14 is also provided with a threaded hole, so that the threaded hole is formed with the threaded hole of the end of the screw rod 13, and the threaded nut is capable of being screwed into a specific locking pin 10 after the locking pin is locked at the position and locked at the position, and the locking pin 10. In a word, the manual spindle locking device on the crank arm 9 pushes the locking pin 10 to move back and forth through the rotating hand wheel 11 and the screw rod 13, the screw rod 13 drives the locking pin 10 back and forth through the clamping of the stop block 17 to the tail end of the screw rod and the relative rotation of the screw rod and the cover plate 16, and finally the locking pin 10 can be accurately and stably pulled out and put in the locking pin sleeve 12 at the upper position and the lower position corresponding to the full-opening and full-closing position of the valve.
In addition, as shown in fig. 4, a limit groove matched with a locating rod 18 fixed on a fixed seat is formed in the top end of the upper side of the locking pin 10, the locating rod 18 is fixed on the fixed seat through a locating rod nut 19, the limit groove formed in the upper side of the locking pin 10 limits the locating rod to move forward and backward in the horizontal direction, so that the locking pin 10 cannot axially rotate, two ends of the limit groove can be clamped with the locating rod 18 on the fixed seat, accurate movement of the locking pin 10 into and out of the locking pin sleeve 12 are further guaranteed, and a worker can feedback whether a hand wheel rotates to a limit position or not. In addition, the conical surface seal can be preferentially adopted between the locking pin 10 and the locking pin sleeve 12, so that the accuracy of the locking position can be ensured.
When the manual device, the electric device or the transmission device in the ball valve has problems and needs to be disassembled for maintenance, the valve is in a fully opened or fully closed state by arranging the fully opened and fully closed manual mechanical locking device, and the maintenance can be safely and conveniently performed under the condition that the pipeline has water. The hand wheel is used for operating the locking pin to be put into and pulled out, so that the labor is saved. The taper pin connection ensures that the locking position is accurate.
It is worth mentioning that the eccentric full-bore ball valve with the asymmetric sealing structure does not use the left-right symmetric low-cost fixed soft sealing structure, because the fixed soft sealing structures are simultaneously used on two sides under the condition that both ends of the water inlet and outlet of the valve are both provided with the fixed soft sealing structures, and the two soft sealing structures can be simultaneously sealed or simultaneously overhauled, so that the requirements of one work and one overhaul cannot be met.
Compared with the prior art, the invention has the beneficial effects that:
1. The eccentric full-drift diameter ball valve with the asymmetric sealing structure changes the working sealing structure in two movable differential pressure type metal hard sealing structures (the ball valve water inlet side maintenance sealing structure and the ball valve water outlet side working sealing structure) into a fixed type soft sealing structure, so that the fixed type soft sealing structure is used as a common working sealing positioned at the downstream, the metal hard sealing structure which moves linearly is not needed under the normal working condition, the fixed type soft sealing structure does not need hydraulic or hydraulic driving, a water system or an oil system is simplified, a water system control cabinet or an oil system control cabinet does not need to be matched with the ball valve, the water system control cabinet or the oil system control cabinet can be used as a movable special tool, and the water system control cabinet can be connected with the ball valve only when the ball valve needs to be overhauled on line, thereby reducing the manufacturing cost and simplifying the control mode. In addition, when overhauling, only need the rubber seal circle of quick replacement fixed soft seal structure can accomplish seal structure's maintenance, maintenance easy operation.
2. According to the full-drift-diameter ball valve with the asymmetric sealing structure, through matching of the eccentric structure and the manual spindle locking device, the eccentric crank arm can ensure that the valve is in a full-opening or full-closing position, the moment of opening and closing is increased, and the valve sealing ring and the rubber sealing ring can be rapidly separated by increasing the eccentricity.
3. The screw rod in the manual spindle locking device on the crank arm pushes the locking pin back and forth through the clamping of the stop block and the relative rotation between the stop block and the cover plate, the locking pin and the locking pin sleeve are matched through conical surfaces, and the locking nut and the positioning rod are matched, so that the locking pin can be accurately and stably pulled out and put into the locking pin sleeve at the upper and lower positions corresponding to the full-opening and full-closing positions of the valve, the full-opening and full-closing positions of the valve are accurate, and the worker can also feedback and know whether the locking pin is put into place or not through the matching of the conical surface structure and the limiting groove on the side surface of the locking pin.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.
Claims (8)
1. The eccentric full-drift diameter ball valve is characterized by comprising a valve body, a valve, a movable differential pressure type metal hard sealing structure, a fixed soft sealing structure, a crank arm and a manual spindle locking device, wherein the crank arm and the manual spindle locking device are arranged outside the valve body;
The movable differential pressure type metal hard sealing structure comprises a valve sealing ring fixed on the valve through a screw, a movable ring doing linear motion and a supporting ring fixed on the valve body, wherein the valve body is respectively provided with a water inlet and a water outlet connected to a water system, the movable ring is movably arranged between the valve body and the supporting ring, the valve sealing ring, the supporting ring and the valve body which are matched with the conical surface of the movable ring form a space for placing the movable ring, and the water inlet and the water outlet respectively arranged on the supporting ring and the valve body are communicated with the space for placing the movable ring;
the fixed soft sealing structure comprises a fixed sealing seat fixed on the valve body and a rubber sealing ring fixed on the valve, and the fixed sealing seat and the rubber sealing ring can be tightly matched to form a pair of working sealing pairs.
2. The eccentric full-bore ball valve with the asymmetric sealing structure according to claim 1, wherein the fixed soft sealing structure further comprises a pressing ring, the rubber sealing ring is fixed in a groove on the valve through the pressing ring and a screw below, and the compression amount of the rubber sealing ring can be adjusted through the pressing ring so as to ensure zero leakage.
3. The eccentric full-bore ball valve of claim 1, wherein the valve shaft centerline is offset from the valve body centerline in a vertical direction by a distance that creates an eccentricity in the vertical direction.
4. An eccentric full-bore ball valve of an asymmetric seal structure as claimed in claim 3, wherein the length of the eccentricity is 1-10mm.
5. The eccentric full-bore ball valve with the asymmetric sealing structure according to claim 1, wherein the fixed sealing seat is made of stainless steel, and the rubber sealing ring is made of NBR or EPDM.
6. The eccentric full-diameter ball valve with the asymmetric sealing structure according to claim 1, wherein the manual spindle locking device comprises a hand wheel, a screw rod connected with the hand wheel, a locking nut, a bolt, a stop block, a cover plate and a locking pin arranged in a fixed seat on the crank arm, the cover plate is fixed at one end of the fixed seat through the bolt, a threaded hole is formed in the cover plate, the threaded hole and the screw rod are matched to form a screw rod nut structure, when the valve is in a full-open state or a full-closed state, the locking pin can be pulled out and put in two locking pin sleeves arranged on the valve body, and the locking pin sleeves are matched through a conical surface structure.
7. The eccentric full-bore ball valve with the asymmetric sealing structure according to claim 6, wherein the manual spindle locking device further comprises a stop block, the stop block is fixedly connected with an internal thread of a groove formed in the tail portion of the locking pin through an external thread, the tail end of the screw rod is of a truncated cone-shaped structure, the stop block is used for limiting the truncated cone-shaped structure to do linear motion, and the truncated cone-shaped structure can rotate freely in the groove formed in the tail portion of the locking pin.
8. The eccentric full-bore ball valve with the asymmetric sealing structure according to claim 6, wherein the manual spindle locking device further comprises a positioning rod and a positioning rod nut, the positioning rod is fixed on the fixed seat through the positioning rod nut, a limit groove matched with one end of the positioning rod is formed in the side face of the locking pin, and the limit groove limits the positioning rod to move only in the horizontal direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910689110.6A CN110332331B (en) | 2019-07-29 | 2019-07-29 | Eccentric full-bore ball valve with asymmetric sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910689110.6A CN110332331B (en) | 2019-07-29 | 2019-07-29 | Eccentric full-bore ball valve with asymmetric sealing structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110332331A CN110332331A (en) | 2019-10-15 |
| CN110332331B true CN110332331B (en) | 2024-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910689110.6A Active CN110332331B (en) | 2019-07-29 | 2019-07-29 | Eccentric full-bore ball valve with asymmetric sealing structure |
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| CN106763869A (en) * | 2017-01-12 | 2017-05-31 | 胜利阀门有限公司 | A kind of Full-diameter eccentric hemisphere valve |
| CN207486098U (en) * | 2017-10-02 | 2018-06-12 | 新昌县大市聚镇树韩网络工作室 | A kind of pretightening sealing ball valve device |
| CN210265979U (en) * | 2019-07-29 | 2020-04-07 | 中阀科技(长沙)阀门有限公司 | Eccentric full-bore ball valve with asymmetric sealing structure |
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| CN103363144A (en) * | 2012-03-26 | 2013-10-23 | 胡侃 | Top entry full-bore eccentric half ball valve with no independent valve seat |
| CN202646759U (en) * | 2012-06-29 | 2013-01-02 | 郑州市郑蝶阀门有限公司 | High water head full bore pump station ball valve |
| CN204828905U (en) * | 2015-08-05 | 2015-12-02 | 中阀科技(长沙)阀门有限公司 | Hydraulic turbine is intake ball valve and is overhauld sealed manual mechanical lock spindle structure |
| CN106763869A (en) * | 2017-01-12 | 2017-05-31 | 胜利阀门有限公司 | A kind of Full-diameter eccentric hemisphere valve |
| CN207486098U (en) * | 2017-10-02 | 2018-06-12 | 新昌县大市聚镇树韩网络工作室 | A kind of pretightening sealing ball valve device |
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Also Published As
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|---|---|
| CN110332331A (en) | 2019-10-15 |
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