CN114198521A - Pilot self-operated double-blocking-discharge normally-installed bushing plug valve and working method thereof - Google Patents
Pilot self-operated double-blocking-discharge normally-installed bushing plug valve and working method thereof Download PDFInfo
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- CN114198521A CN114198521A CN202111477700.6A CN202111477700A CN114198521A CN 114198521 A CN114198521 A CN 114198521A CN 202111477700 A CN202111477700 A CN 202111477700A CN 114198521 A CN114198521 A CN 114198521A
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000007789 sealing Methods 0.000 claims abstract description 51
- 238000012856 packing Methods 0.000 claims description 32
- 230000006698 induction Effects 0.000 claims description 27
- 238000011144 upstream manufacturing Methods 0.000 claims description 26
- 230000007246 mechanism Effects 0.000 claims description 24
- 230000008878 coupling Effects 0.000 claims description 10
- 238000010168 coupling process Methods 0.000 claims description 10
- 238000005859 coupling reaction Methods 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims 1
- 238000000926 separation method Methods 0.000 claims 1
- 239000000945 filler Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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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
- F16K5/02—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 conical surfaces; Packings therefor
- F16K5/0242—Spindles and actuating means
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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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
- F16K27/062—Construction of housing; Use of materials therefor of taps or cocks with conical plugs
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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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/53—Mechanical actuating means with toothed gearing
- F16K31/535—Mechanical actuating means with toothed gearing for rotating valves
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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
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0083—For recording or indicating the functioning of a valve in combination with test equipment by measuring valve parameters
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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
- F16K5/02—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 conical surfaces; Packings therefor
- F16K5/0257—Packings
- F16K5/0285—Packings spindle sealing
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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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- 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
- F16K5/14—Special arrangements for separating the sealing faces or for pressing them together
- F16K5/16—Special arrangements for separating the sealing faces or for pressing them together for plugs with conical surfaces
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
Abstract
The invention discloses a pilot self-operated double-blocking discharge forward-installed bushing plug valve and a switching working method thereof. The invention realizes self-operated compensation sealing specific pressure by the design of the sensor and the bypass device to replace the traditional manual compensation, thereby prolonging the service life of the valve and reducing the cost of the valve.
Description
Technical Field
The invention relates to a plug valve, in particular to a pilot self-operated double-blocking discharge plug valve with a normally installed bushing and a working method thereof.
Background
The plug valve is a rotary valve in a closing part or a plunger shape, and the opening or the closing of the valve is realized by rotating 90 degrees to enable a passage port on the plug to be communicated with or separated from a passage port on the valve body. The valve plug can be cylindrical or conical in shape, and the channel is trapezoidal.
When the existing bushing plug valve is applied to the industries of sea water desalination and petrochemical industry, in order to meet larger market demands, the capacity of the project is increased by times, and the plug valve is required to bear the nominal pressure of high pressure or ultrahigh pressure and also has the requirements of good sealing property, quick operation and convenient maintainability.
However, the conventional bushing plug valve is limited by the design structure, generally, the conventional bushing plug valve can only be compensated by manual sealing force difficultly, the problems that the service life of a bushing is short and the like due to overlarge operating torque under high pressure cannot be solved, after the conventional bushing plug valve is used for a long time, the sealing performance of the valve is seriously influenced by abrasion caused by various factors, the closing operating torque of a valve plug body is influenced due to the existence of abraded solid particles, the rapid operating performance is reduced, and accidents are directly caused frequently, so that further improvement is urgently needed.
Disclosure of Invention
The invention aims to provide a pilot self-operated double-blocking discharge forward-mounted bushing plug valve and a working method thereof, and the plug valve solves the problem of sealing performance caused by friction between a frequently opened and closed valve and a sealing pair in the prior art and greatly reduces the torque of the opened and closed valve required by a power mechanism of the opened and closed valve.
The technical purpose of the invention is realized by the following technical scheme: the utility model provides a two jam of guide's formula of relying on oneself are discharged and are just adorned bush plug valve, includes valve body, valve gap, bypass device, operating means, the inside valve pocket that is provided with and gets into end and discharge end and are linked together of valve body, be provided with the cock body in the valve pocket, be equipped with the passageway in the cock body, the one end that the cross-sectional area of cock body is big is provided with the valve rod, the valve gap is passed to the one end that the cock body was kept away from to the valve rod, the end that the cock body was kept away from to the valve rod is square and is connected with and can drive the valve rod and carry out the pivoted shaft coupling, the valve body external fixation has bypass device, valve gap and valve rod clearance fit, locate in the shaft coupling operating means, operating means fixes on the valve gap, the valve gap is fixed on the valve body, be provided with the bush between cock body and the valve body, the terminal surface center that the valve rod was kept away from to the cock body is equipped with the circular slot outward, the valve body bottom is equipped with the fixed axle of wearing to the circular slot from the valve body, the fixed shaft is in clearance fit with the circular groove and fixed at the bottom of the valve body through a bolt, a through hole is formed in the fixed shaft along the axis direction, a discharge valve is arranged in the through hole, and a left flow passage and a right flow passage which are communicated with the discharge valve are formed in the fixed shaft along the radial direction.
The invention is further provided with: the novel valve is characterized in that a flywheel type sealing sleeve matched with the outer surface of the valve rod and the inner surface of the valve body is arranged in an area surrounded by the valve cover, the valve body, the lining and the plug body, a first O-shaped sealing ring is arranged between the flywheel type sealing sleeve and the outer surface of the valve rod, a second O-shaped sealing ring is arranged between the flywheel type sealing sleeve and the inner surface of the valve body, and the flywheel type sealing sleeve, the first O-shaped sealing ring, the second O-shaped sealing ring, the valve body, the lining and the plug body form a sealing cavity together.
The invention is further provided with: the bypass device comprises an upstream bypass and a downstream bypass which are bilaterally symmetrical, the upstream bypass and the downstream bypass are composed of a needle valve, a pipeline, a right-angle connecting pipe, an elbow, a one-way valve and an induction electromagnetic valve which are sequentially connected, the induction electromagnetic valve is connected with the sealed cavity in a switching mode, the needle valve of the upstream bypass is fixed on the valve body and can be connected with the inlet end of the valve body in a switching mode, the needle valve of the downstream bypass is fixed on the valve body and can be connected with the outlet end of the valve body in a switching mode, the one-way valve arranged on the upstream bypass flows to the induction electromagnetic valve through the elbow, and the one-way valve of the downstream bypass flows to the elbow through the induction electromagnetic valve.
The invention is further provided with: the operating device is provided with a support close to the valve cover, the support, the valve cover and the valve rod form a packing area, a packing ring, a packing and a packing pressing sleeve are arranged in the packing area from bottom to top, the packing pressing sleeve is also in contact with a packing pressing plate, the packing pressing plate is in surface contact with a bolt and a nut, and the packing pressing plate is pressed on the packing pressing sleeve all the time through a screwed bolt and a screwed nut.
The invention is further provided with: the valve rod is further provided with a split ring clamped in, a pressing plate in contact with the split ring surface, the pressing plate is connected with the support through an adjusting stud, and a belleville spring is further arranged between the pressing plate and the adjusting stud.
The invention is further provided with: the operating device is also internally provided with a worm gear mechanism, a worm wheel (not shown in the figure) in the worm gear mechanism is in an incomplete fan-shaped structure, and the worm wheel of the worm gear mechanism is connected with the coupler through a spline (not shown in the figure) and has a gap.
The invention is further provided with: and the worm gear mechanism is also provided with an adjusting screw and a position sensor, the position sensor is arranged in the adjusting screw, and the position sensor detects the distance between the worm gear and the adjusting screw in the worm gear mechanism and communicates with the induction electromagnetic valve.
The invention is further provided with: when the valve is required to be opened from a closed state, the worm wheel of the worm mechanism needs to leave the adjusting screw under the action of the operating device, when the worm wheel leaves the sensing range of the position sensor, the position sensor transmits a signal of the leaving of the worm wheel to the induction electromagnetic valve of the downstream bypass, the induction electromagnetic valve is communicated with the downstream bypass of the discharge end, the downstream bypass is opened, before the valve rod rotates, the worm wheel and the coupler are connected through the spline and have a gap, the spline is not driven by the rotation of the worm wheel in the process, the medium pressure in the sealed cavity is released to the discharge end before the worm wheel is contacted with the spline, at the moment, the worm wheel continuously rotates to drive the spline to enable the coupler and the valve rod to rotate by 90 degrees, and the valve is opened;
when the pressure-balanced seal is required to be closed from an opening state, the worm wheel of the worm mechanism rotates the worm wheel reversely under the action of the operating device, when the other side of the worm wheel contacts the spline, the coupler and the valve rod rotate reversely by 90 degrees, the valve is closed, at the moment, the worm wheel is jacked to the adjusting screw, the position sensor transmits a signal to the induction electromagnetic valve of the upstream bypass, the induction electromagnetic valve is communicated with the upstream bypass of the inlet end, pressure media are introduced into the seal chamber, the axial area difference of the plug body forms downward pressure along with the increase of the pressure of the seal chamber, and the plug body is pushed to the bushing to compensate the required seal specific pressure of the high-pressure lower seal pair, so that the pressure dynamic balance seal is formed.
The invention is further provided with: when the valve is in a closed state, if the pressure of the chamber of the sealed chamber is abnormally increased by the influence of environment or other factors and exceeds 25PSI, the internal pressure of the valve can burst the check valve in the upstream bypass on the side of the inlet end to be released upstream, and the safety performance of the valve is ensured.
In conclusion, the invention has the following beneficial effects: according to the plug valve, when the valve is closed through the sensor, medium pressure is introduced into a sealing cavity formed between the valve body and the sealing sleeve through the bypass structure, the plug body is pushed to the bushing to be sealed in a self-operated mode, the medium pressure in the cavity can be automatically released through the bypass structure when the valve is opened, the friction force between the sealing pairs is reduced rapidly, the valve is opened conveniently, the problem of tightness caused by friction between the frequently opened valve and the sealing pairs in the prior art is solved, and the torque of the opened valve and the closed valve required by a power mechanism of the opened valve and the closed valve is greatly reduced. When the pressure in the sealed cavity is overlarge, the pressure can be released through the bypass device, and the use safety of the valve is ensured.
Drawings
FIG. 1 is a view of the internal structure of a pilot self-operated dual-block drain plug valve with a positively installed bushing;
FIG. 2 is a schematic view of a portion of the bottom of the valve body of FIG. 1;
FIG. 3 is a schematic view of a partial structure of the sealed chamber of FIG. 1;
FIG. 4 is a schematic view of the bypass device of FIG. 1;
FIG. 5 is a schematic view of a portion of the connection between the operation device and the valve cover of FIG. 1;
FIG. 6 is a schematic view of the construction of the manipulating device of FIG. 1;
reference numerals: 1. a valve body; 2. a valve cover; 3. a bypass device; 4. an operating device; 5. a plug body; 6. a valve stem; 7. a coupling; 8. a bushing; 9. a fixed shaft; 10. a bolt; 11. an entrance end; 12. a discharge end; 13. a valve cavity; 20. a flywheel type sealing sleeve; 30. sealing the chamber; 31. an upstream bypass; 32. a downstream bypass; 40. a filler zone; 41. a support; 42. a worm gear mechanism; 43. an adjusting screw; 44. a position sensor; 50. opening the ring; 51. a circular groove; 60. pressing a plate; 70. adjusting the stud; 80. a belleville spring; 91. a through hole; 92 a discharge valve; 93. a left flow channel; 94. a right flow passage; 201. a first O-ring seal; 202. a second O-ring seal; 311. a needle valve; 312. a pipeline; 313. a right-angle connecting pipe; 314. bending the pipe; 315. a one-way valve; 316. an induction solenoid valve; 401. a packing ring; 402. a filler; 403. pressing and sleeving the filler; 404. a packing press plate; 405. a bolt and a nut;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1-6, a pilot-operated self-operated plug valve with double-block discharge and forward installation of a bushing comprises a valve body 1, a valve cover 2, a bypass device 3 and an operating device 4, wherein a valve cavity 13 communicated with an inlet end 11 and an outlet end 12 is arranged inside the valve body 1, a plug body 5 is arranged in the valve cavity 13, a channel is arranged in the plug body 5, a valve rod 6 is arranged at one end with a large cross section area of the plug body 5, one end of the valve rod 6, far away from the plug body 5, penetrates through the valve cover 2, the tail end of the valve rod 6, far away from the plug body 5, is square and is connected with a coupler 7 capable of driving the valve rod 6 to rotate, the bypass device 3 is fixed outside the valve body 1, the valve cover 2 is in clearance fit with the valve rod 6, the coupler 7 is arranged inside the operating device 4, the operating device 4 is fixed on the valve cover 2, the valve cover 2 is fixed on the valve body 1, a bushing 8 is arranged between the plug body 5 and the valve body 1, a circular groove 51 is arranged in the center of the end surface of the plug body 5, far away from the valve rod 6, the bottom of the valve body 1 is provided with a fixed shaft 9 penetrating from the outside of the valve body 1 to the circular groove 51, the fixed shaft 9 is in clearance fit with the circular groove 51 and is fixed at the bottom of the valve body 1 through a bolt 10, the fixed shaft 9 is provided with a through hole 91 along the axial direction, a discharge valve 92 is arranged in the through hole 91, and the fixed shaft 9 is provided with a left flow passage 93 and a right flow passage 94 communicated with the discharge valve 92 along the radial direction.
Further, a flywheel type sealing sleeve 20 matched with the outer surface of the valve rod 6 and the inner surface of the valve body 1 is arranged in an area defined by the valve cover 2, the valve body 1, the bushing 8 and the plug body 5, a first O-shaped sealing ring 201 is arranged between the flywheel type sealing sleeve 20 and the outer surface of the valve rod 6, a second O-shaped sealing ring 202 is arranged between the flywheel type sealing sleeve 20 and the inner surface of the valve body 1, and the flywheel type sealing sleeve 20, the first O-shaped sealing ring 201 and the second O-shaped sealing ring 202, the valve body 1, the bushing 8 and the plug body 5 jointly form a sealing cavity 30.
Further, the bypass device 3 is divided into an upstream bypass 31 and a downstream bypass 32 which are bilaterally symmetrical, the upstream bypass 31 and the downstream bypass 32 are respectively composed of a needle valve 311, a pipeline 312, a right-angle connecting pipe 313, an elbow 314, a one-way valve 315 and an induction electromagnetic valve 316 which are sequentially connected, the induction electromagnetic valve 316 is connected with the sealed chamber 30 in a switching mode, the needle valve 311 of the upstream bypass 31 is fixed on the valve body 1 and can be connected with the inlet end 11 of the valve body 1 in a switching mode, the needle valve 311 of the downstream bypass 32 is fixed on the valve body 1 and can be connected with the outlet end 12 of the valve body 1 in a switching mode, the flow direction of the one-way valve 315 arranged in the upstream bypass 31 is the elbow 314 and flows to the induction electromagnetic valve 316, and the flow direction of the one-way valve 315 of the downstream bypass 32 is the induction electromagnetic valve 316 and flows to the elbow 314.
When the valve reaches the closing position, the bypass device introduces medium pressure into a sealing chamber 30 formed between the valve body 1 and the flywheel type sealing sleeve 20. along with the rise of the upstream medium pressure, the plug body 1 is pushed to the bushing 8 by a downward medium force formed by the axial area difference of the taper of the plug body 1 so as to compensate the sealing specific pressure required by a sealing pair under high pressure and form pressure dynamic balance sealing.
When the specific seal pressure is insufficient over a long period of time, in addition to directly increasing the pressure in the seal chamber 30 to increase the downward pressure difference, there is also a method in which the medium pressure can be discharged through the discharge valve 92 to form a greater pressure difference with the seal chamber 30, so that the plug body 5 is sufficiently urged toward the liner 8 to be sealed.
Further, a support 41 is arranged at a position, close to the valve cover 2, of the operating device 4, the support 41, the valve cover 2 and the valve rod 6 enclose a packing area 40, a packing ring 401, a packing 402 and a packing pressing sleeve 403 are arranged in the packing area 40 from bottom to top, the packing pressing sleeve 403 is also in contact with a packing pressing plate 404, the packing pressing plate 404 is in surface contact with a bolt and nut 405, and the packing pressing plate 404 is pressed on the packing pressing sleeve 403 all the time through the tightened bolt and nut 405.
Further, the valve rod 6 is further provided with a clamped split ring 50, a pressure plate 60 is further arranged in surface contact with the split ring 50, the pressure plate 60 is connected with the support 41 through an adjusting stud 70, and a belleville spring 80 is further arranged between the pressure plate 60 and the adjusting stud 70.
When the pressure is low, the pressure plate 60 is pressed down onto the split ring 50 only by rotating the pressing belleville spring 80 through the adjusting stud 70, and the split ring drives the valve rod 6 and the plug body 1 where the valve rod 6 is located to push the bush 8 to form low-pressure sealing.
Further, a worm gear mechanism 42 is provided in the operation device 4, a worm wheel (not shown) of the worm gear mechanism 42 has an incomplete sector structure, and the worm wheel of the worm gear mechanism 42 and the coupling 7 are connected by a spline (not shown) with a gap.
Due to the existence of the gap, the coupling 7 and the valve rod 6 cannot be driven to rotate immediately when the worm wheel starts to rotate, and the operation of rotating 90 degrees before the medium pressure in the sealing chamber 30 is discharged is avoided. When the medium pressure is discharged, the worm wheel just rotates through the gap to be in contact with the spline, and the coupler 7 and the valve rod 6 start to rotate by 90 degrees.
Furthermore, an adjusting screw 43 and a position sensor 44 are provided in the section where the worm gear mechanism 4 is located, the position sensor 44 is built in the adjusting screw 43, and the position sensor 44 detects the distance between the worm gear and the adjusting screw 43 in the worm gear mechanism 4 and communicates with the induction solenoid valve 316.
When the worm wheel leaves the adjusting screw 43 and exceeds the sensing range of the position sensor 44, the position sensor 44 transmits a signal of the leaving of the worm wheel to the induction solenoid valve 316, and vice versa.
Further, when the valve needs to be opened from the closed state, the worm wheel of the worm mechanism 42 needs to leave the adjusting screw 43 under the action of the operating device 4, when the worm wheel leaves the sensing range of the position sensor 44, the position sensor 44 transmits a signal of the worm wheel leaving to the sensing electromagnetic valve 316 of the downstream bypass 32, the sensing electromagnetic valve 316 is communicated with the downstream bypass 32 of the discharge end 12, the downstream bypass 32 is opened, before the valve rod 6 rotates, because the worm wheel is connected with the coupler 7 through the spline and has a gap, the rotation of the worm wheel does not drive the spline in the process, the medium pressure in the sealed chamber 30 is released to the discharge end 12 before the worm wheel is contacted with the spline, at the moment, the worm wheel continues to rotate to drive the spline to rotate the coupler 7 and the valve rod 6 for 90 degrees, and the valve is opened;
when the valve needs to be closed from an opening state, the worm wheel of the worm mechanism 42 rotates the worm wheel reversely under the action of the operating device 4, when the other side of the worm wheel contacts with the spline, the coupling 7 and the valve rod 6 rotate reversely by 90 degrees, the valve is closed, at the moment, the worm wheel is jacked to the adjusting screw 43, the position sensor 44 transmits a signal to the induction electromagnetic valve 316 of the upstream bypass 31, the induction electromagnetic valve 316 is communicated with the upstream bypass 31 of the inlet end 11, pressure media are introduced into the sealing chamber 30, the axial area difference of the plug body 5 forms downward pressure along with the rise of the pressure of the sealing chamber 30, and the plug body 5 is pushed to the lining 8 to compensate the sealing specific pressure required by the high-pressure sealing pair, so that the pressure dynamic balance seal is formed.
Further, when the valve is in a closed state, if the chamber pressure of the sealed chamber 30 abnormally rises and exceeds 25PSI due to the influence of environment or other factors, the internal pressure of the valve can burst the check valve 315 in the upstream bypass 31 on the side of the inlet end 11 to be released upstream, and the safety performance of the valve is ensured.
The specific embodiments are only for explaining the present invention, and the present invention is not limited thereto, and those skilled in the art can make modifications without inventive contribution to the present embodiments as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (9)
1. The utility model provides a two jam of guide's formula of relying on oneself are discharged and are being adorned bush plug valve just, includes valve body (1), valve gap (2), bypass device (3), operating means (4), its characterized in that, valve body (1) inside be provided with get into valve pocket (13) that end (11) and discharge end (12) are linked together, be provided with cock body (5) in valve pocket (13), be equipped with the passageway in cock body (5), the one end that cock body (5) cross-sectional area is big is provided with valve rod (6), valve gap (2) is passed to the one end that cock body (5) were kept away from in valve rod (6), the end that cock body (5) were kept away from in valve rod (6) is square and is connected with can drive valve rod (6) and carry out pivoted shaft coupling (7), valve body (1) external fixation has bypass device (3), valve gap fit (2) and valve rod (6), be equipped with in shaft coupling (7) operating means (4), operating means (4) are fixed on valve gap (2), valve gap (2) are fixed on valve body (1), be provided with bush (8) between cock body (5) and valve body (1), the terminal surface center that cock body (5) kept away from valve rod (6) is equipped with circular recess (51), valve body (1) bottom is equipped with from valve body (1) outer fixed axle (9) to circular recess (51), fixed axle (9) with circular recess (51) clearance fit and fix in valve body (1) bottom through bolt (10), through-hole (91) have been seted up along the axis direction to fixed axle (9), discharge valve (92) are equipped with in through-hole (91), fixed axle (9) radially seted up with discharge valve (92) communicating left runner (93) and right runner (94).
2. The pilot-operated self-operated dual-block bleed positive-loading bushing plug valve of claim 1, further comprising: valve gap (2), valve body (1), bush (8), cock body (5) enclose regional inside be equipped with valve rod (6) surface and valve body (1) internal surface complex flywheel formula seal cover (20), be equipped with first O type sealing washer (201) between flywheel formula seal cover (20) and valve rod (6) surface, be equipped with second O type sealing washer (202) between flywheel formula seal cover (20) and valve body (1) internal surface, flywheel formula seal cover (20), first O type sealing washer (201), second O type sealing washer (202) and valve body (1), bush (8), cock body (5) form sealed cavity (30) jointly.
3. The pilot-operated self-operated dual-block bleed positive-loading bushing plug valve of claim 2, wherein: the bypass device (3) is divided into an upstream bypass (31) and a downstream bypass (32) which are bilaterally symmetrical, the upstream bypass (31) and the downstream bypass (32) are respectively composed of a needle valve (311), a pipeline (312), a right-angle connecting pipe (313), an elbow (314), a one-way valve (315) and an induction electromagnetic valve (316) which are connected in sequence, the induction electromagnetic valve (316) is connected with and disconnected from the sealed chamber (30), the needle valve (311) of the upstream bypass (31) is fixed on the valve body (1) and can be connected with and disconnected from the inlet end (11) of the valve body (1), the needle valve (311) of the downstream bypass (32) is fixed on the valve body (1) and can be connected with and disconnected from the outlet end (12) of the valve body (1), the one-way valve (315) arranged on the upstream bypass (31) flows to the induction solenoid valve (316) from the elbow (314), the check valve (315) of the downstream bypass (32) flows to the elbow (314) as the induction solenoid valve (316).
4. A pilot-operated self-operated dual-block bleed positive-loading bushing plug valve as defined in claim 3, wherein: the operating device (4) is provided with a support (41) close to the valve cover (2), the support (41), the valve cover (2) and the valve rod (6) enclose a packing area (40), a packing ring (401), a packing (402) and a packing pressing sleeve (403) are arranged in the packing area (40) from bottom to top, the packing pressing sleeve (403) is also in contact with a packing pressing plate (404), the packing pressing plate (404) is in surface contact with a bolt and nut (405), and the packing pressing plate (404) is always pressed on the packing pressing sleeve (403) through the tightened bolt and nut (405).
5. The pilot-operated self-operated dual-block bleed positive-loading bushing plug valve of claim 4, wherein: still be equipped with go up valve rod (6) go into go to the ring (50) that opens that go into, with go to the ring (50) face contact still have clamp plate (60), clamp plate (60) are connected with support (41) through adjusting stud (70), still be equipped with belleville spring (80) between clamp plate (60) and adjusting stud (70).
6. A pilot-operated self-operated dual-block bleed positive-loading bushing plug valve as defined in claim 3, wherein: a worm gear mechanism (42) is further arranged in the operating device (4), a worm wheel in the worm gear mechanism (42) is of an incomplete fan-shaped structure, and the worm wheel of the worm gear mechanism (42) is connected with the coupler (7) through a spline and has a gap.
7. The pilot-operated self-operated dual-block bleed positive-loading bushing plug valve of claim 6, wherein: an adjusting screw (43) and a position sensor (44) are further arranged in the region where the worm gear mechanism (4) is located, the position sensor (44) is arranged in the adjusting screw (43), and the position sensor (44) detects the distance between a worm gear in the worm gear mechanism (4) and the adjusting screw (43) and communicates with the induction solenoid valve (316).
8. A method of operating a pilot-operated self-operated dual block bleed positive-loading bushing plug valve as defined in claim 7, wherein: when the worm wheel of the worm mechanism (42) needs to be separated from the adjusting screw (43) under the action of the operating device (4) when the worm wheel needs to be opened from the closed state, and when the worm wheel is separated from the sensing range of the position sensor (44), the position sensor (44) transmits a signal of the separation of the worm wheel to the induction electromagnetic valve (316) of the downstream bypass (32), the induction electromagnetic valve (316) is communicated with the downstream bypass (32) of the discharge end (12), and the downstream bypass (32) is opened, before the valve rod (6) rotates, because the worm wheel is connected with the coupling (7) through the spline and a gap exists, in the process, the worm gear rotates to drive the spline, medium pressure in the sealing chamber (30) is released to the discharge end (12) before the worm gear is contacted with the spline, at the moment, the worm gear continuously rotates to drive the spline to enable the coupler (7) and the valve rod (6) to rotate 90 degrees, and the valve is opened;
when the valve needs to be closed from an opening state, the worm wheel of the worm mechanism (42) rotates in the reverse direction under the action of the operating device (4), when the other side of the worm wheel contacts with the spline, the coupling (7) and the valve rod (6) rotate in the reverse direction for 90 degrees, the valve is closed, at the moment, the worm wheel is jacked to the adjusting screw (43), the position sensor (44) transmits signals to the induction electromagnetic valve (316) of the upstream bypass (31), the induction electromagnetic valve (316) is communicated with the upstream bypass (31) of the inlet end (11), pressure media are introduced into the sealing chamber (30), along with the rise of the pressure of the sealing chamber (30), the axial area difference of the plug body (5) forms downward pressure, and the plug body (5) is pushed to the lining (8) to compensate for the sealing specific pressure required by a high-pressure sealing pair, so that pressure dynamic balance sealing is formed.
9. The method of operation of claim 8, wherein: when the valve is in a closed state, if the chamber pressure of the sealed chamber (30) is abnormally increased and exceeds 25PSI due to the influence of environment or other factors, the internal pressure of the valve can burst the check valve (315) in the upstream bypass (31) on the side of the inlet end (11) to be released upstream, and the safety performance of the valve is ensured.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111477700.6A CN114198521B (en) | 2021-12-06 | 2021-12-06 | Pilot-operated self-operated double-blocking discharge plug valve with positively-installed bushing and working method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111477700.6A CN114198521B (en) | 2021-12-06 | 2021-12-06 | Pilot-operated self-operated double-blocking discharge plug valve with positively-installed bushing and working method thereof |
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| Publication Number | Publication Date |
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| CN114198521A true CN114198521A (en) | 2022-03-18 |
| CN114198521B CN114198521B (en) | 2024-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111477700.6A Active CN114198521B (en) | 2021-12-06 | 2021-12-06 | Pilot-operated self-operated double-blocking discharge plug valve with positively-installed bushing and working method thereof |
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| CN (1) | CN114198521B (en) |
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| CN114198521B (en) | 2024-02-06 |
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