CN106678385B - Self-operated pressure interval flow valve and control method thereof - Google Patents
Self-operated pressure interval flow valve and control method thereof Download PDFInfo
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- CN106678385B CN106678385B CN201710135275.XA CN201710135275A CN106678385B CN 106678385 B CN106678385 B CN 106678385B CN 201710135275 A CN201710135275 A CN 201710135275A CN 106678385 B CN106678385 B CN 106678385B
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000007789 sealing Methods 0.000 claims description 27
- 239000000945 filler Substances 0.000 claims description 16
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 125000006850 spacer group Chemical group 0.000 claims description 9
- 210000004907 gland Anatomy 0.000 claims description 6
- 238000012856 packing Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 abstract description 3
- 238000005192 partition Methods 0.000 abstract 1
- 230000007547 defect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000000926 separation method 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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/314—Forms or constructions of slides; Attachment of the slide to the spindle
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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
- F16K27/04—Construction of housing; Use of materials therefor of sliding valves
- F16K27/041—Construction of housing; Use of materials therefor of sliding valves cylindrical slide 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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/12—Covers for housings
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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
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
- F16K31/1221—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston one side of the piston being spring-loaded
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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
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
- F16K41/04—Spindle sealings with stuffing-box ; Sealing rings with at least one ring of rubber or like material between spindle and housing
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
- Details Of Valves (AREA)
Abstract
The invention provides a self-operated pressure interval circulation valve and a control method thereof, the valve comprises a valve body, a valve seat, a valve core, a valve rod and a valve cover, wherein the upper end of the valve cover is connected with a differential pressure valve for driving the valve rod, the inlet end of the valve body is provided with a valve front small hole, the outlet end of the valve body is provided with a valve rear small hole, the valve front small hole controls the differential pressure valve to drive the valve rod to move upwards to open the valve through a first one-way valve, the opening pressure of the first one-way valve is larger than zero, the differential pressure valve controls the valve rod to move downwards to close the valve through a second one-way valve, the opening pressure of the second one-way valve is larger than the opening pressure of the first one-way valve and smaller than the maximum pressure of a valve connecting pipeline, and the differential pressure valve discharges media through the valve rear small hole. The invention does not need an external power supply and a secondary instrument, realizes the opening and closing of the valve when the pressure interval of the pipeline changes by means of the medium of the valve, and then realizes the circulation and the partition of the system pipeline, thereby being capable of working in places without electricity and gas, and being convenient, safe and reliable.
Description
Technical Field
The invention relates to the technical field of valves, in particular to a self-operated pressure interval flow valve and a control method thereof.
Background
At present, a circulation valve capable of working in a certain pressure interval is needed in some places, and an external power supply and a secondary instrument are needed in the existing pressure interval circulation valve, so that the defects of high energy consumption, troublesome installation, high cost and the like exist, and the circulation valve cannot work in places without electricity and air, and is dangerous otherwise.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a self-operated pressure interval circulation valve and a control method thereof, wherein the circulation valve does not need external energy and secondary instruments, and realizes the opening and closing of the valve when the pressure interval of a pipeline changes by means of self media, thereby realizing the circulation and the separation of the pipeline of a system.
In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides a self-operated pressure interval circulation valve, includes valve body, disk seat, case, valve rod and valve gap, the disk seat is fixed to be set up in the valve body, the case cooperatees with the disk seat, valve gap fixed connection is on the control end of valve body, the control end and the valve gap of valve rod are passed in proper order to the upper end of valve rod, the lower extreme of valve rod drives the case and reciprocates and open or close the valve, the upper end of valve gap is connected with the differential pressure valve that is used for driving the valve rod, the entry end of valve body is provided with the valve front aperture, the exit end of valve body is provided with the valve back aperture, the valve front aperture is through the upward movement of first check valve control differential pressure valve drive valve rod in order to open the valve, the opening pressure of first check valve is greater than zero, the differential pressure is through the downward movement of second check valve control valve rod in order to close the valve, the opening pressure of second check valve is greater than the opening pressure of first check valve and is less than the maximum pressure of valve connecting tube, differential pressure valve back aperture discharge medium, differential pressure valve is connected with the third check valve that prevents that the medium from flowing backward from the valve back aperture.
In a further preferred scheme, the self-operated pressure interval circulation valve further comprises an outer cylinder, a piston middle cylinder and a piston outer cylinder, the differential pressure valve comprises a main valve body and a gland, the gland is arranged on the outer side of the lower end of the main valve body to seal a flow channel in the main valve body, the upper end of the valve cover is fixedly connected with the lower end of the outer cylinder through the main valve body, the outer edge of the piston outer cylinder is fixedly connected with the upper end of the outer cylinder, the upper end of the valve rod penetrates through the main valve body and then stretches into an inner cavity of the piston outer cylinder, the piston middle cylinder is fixed at the upper end of the valve rod through a valve rod locking nut, the outer wall of the piston middle cylinder is in sliding fit with the inner wall of the piston outer cylinder, and the inner wall of the piston middle cylinder is in sliding fit with the outer wall of the central pipe, which protrudes upwards, of the main valve body.
In a further preferred scheme, the differential pressure valve further comprises a main piston and a secondary piston which are connected into a whole, the main piston is placed in a left air chamber of the main valve body, a spring for applying left pre-tightening force to the main piston is arranged in the left air chamber, the main piston sequentially separates the left air chamber into a first air chamber, a second air chamber and a third air chamber from left to right, the first air chamber is communicated with an outlet end of the first one-way valve, an inlet end of the first one-way valve is communicated with a small hole in front of the valve, and the second air chamber is respectively communicated with an outlet end of the first one-way valve and an inlet end of the second one-way valve; the auxiliary piston is arranged in a right air chamber of the main valve body, the auxiliary piston sequentially separates the right air chamber into a fourth air chamber, a fifth air chamber and a sixth air chamber from left to right, the fifth air chamber is communicated with the valve rear small hole when the auxiliary piston is positioned at the right end, the sixth air chamber is communicated with the outlet end of the third one-way valve, and the sixth air chamber is communicated with the valve rear small hole when the auxiliary piston is positioned at the left end.
In a further preferred scheme, the inner cavity of the outer cylinder forms a seventh air chamber, the seventh air chamber is respectively communicated with the outlet end of the second one-way valve and the inlet end of the third one-way valve, the inner cavity of the outer cylinder of the piston forms an eighth air chamber, the eighth air chamber is communicated with the seventh air chamber through a through hole on the outer cylinder of the piston, the inner cavity of the middle cylinder of the piston forms a ninth air chamber, and the third air chamber and the fifth air chamber are respectively communicated with the ninth air chamber through channels in the main valve body.
In a further preferred scheme, the center of the valve cover is provided with a stepped hole for the valve rod to pass through, the upper part of the stepped hole is sequentially provided with a lip-shaped sealing ring, a filler spacer ring and filler which encircle the periphery of the valve rod from bottom to top, the filler is fixed in the stepped hole of the valve cover by a filler lock nut, and the inner side of the lower part of the filler lock nut is provided with a sliding bearing which is in sliding fit with the outer wall of the valve rod; the inner wall of the packing spacer ring is provided with an O-shaped ring in sealing fit with the outer wall of the valve rod, and the outer wall of the packing spacer ring is provided with an O-shaped ring in sealing fit with the inner wall of the stepped hole.
In a further preferred scheme, the valve core is a flashboard, and the lower end of the valve rod is fixedly connected with the top of the flashboard through a connecting sleeve.
In a further preferred embodiment, the valve seat is provided with an O-ring in sealing engagement with the valve body, and the valve seat is further provided with a sealing ring in sealing engagement with the valve core.
In a further preferred scheme, the valve cover is provided with a central pipe protruding downwards, a lip-shaped sealing ring matched with the opening of the control end of the valve body is sleeved on the periphery of the central pipe protruding downwards, and sealing O-shaped rings are arranged on all contact surfaces between the valve cover and the valve body.
In a further preferred scheme, the outer edge of the lower end of the valve cover is fixed at the control end of the valve body through a fastener, the outer edge of the upper end of the valve cover is sequentially fixed at the outer edges of the lower ends of the main valve body and the outer cylinder through a fastener, and the outer edge of the outer cylinder of the piston is fixed at the outer edge of the upper end of the outer cylinder through a fastener.
In order to solve the technical problems, another technical scheme of the invention is as follows: a control method of a self-operated pressure interval flow valve comprises the following steps:
(1) When the pressure of a pipeline where the valve is positioned reaches the opening pressure of the first one-way valve, the thrust of a piston of the first one-way valve reaches the pre-tightening pressure of the pressure regulating spring, so that a channel of the first one-way valve circulates, a medium enters the differential pressure valve from a small hole in front of the valve and enters the lower part of the valve rod through the differential pressure valve, and the valve rod is lifted to open the valve by means of upward thrust of the medium;
(2) When the pressure of the pipeline where the valve is positioned is increased to the opening pressure of the second one-way valve, the thrust of the piston of the second one-way valve reaches the pre-tightening pressure of the pressure regulating spring, so that a channel of the second one-way valve circulates, a medium enters the upper part of the valve rod through the pressure difference valve, and the valve rod is pushed to move downwards to the valve to be closed by virtue of the downward thrust of the medium;
(3) When the pipeline pressure of the valve is reduced to be lower than the opening pressure of the second one-way valve, the channel of the second one-way valve is cut off, the medium reenters the lower part of the valve rod through the differential pressure valve, the valve rod ascends to open the valve, and the medium above the valve rod is discharged to the small hole behind the valve through the third one-way valve;
(4) When the pressure of the pipeline where the valve is located is further reduced to be lower than the opening pressure of the first one-way valve, the channel of the first one-way valve is also cut off, medium does not enter the differential pressure valve from the small hole in front of the valve, medium below the valve rod is discharged to the small hole behind the valve through the differential pressure valve, and the valve rod is reduced again to close the valve.
Compared with the prior art, the invention has the following beneficial effects: the self-operated pressure interval circulating valve does not need an external power supply and a secondary instrument, and realizes the opening and closing of the valve when the pressure interval of the pipeline changes by means of self media, so that the circulating and the blocking of the system pipeline are realized, and the self-operated pressure interval circulating valve can work in places without electricity and gas, and is convenient, safe and reliable. For example, the valve is connected with the pipeline at a pressure of 0-C (MPa), and when the pipeline pressure is between A (MPa) and B (MPa), the valve is opened to enable the pipeline to circulate, and when the pipeline is not in the pressure interval, the valve is closed to enable the pipeline to be blocked, wherein 0 < A < B < C (MPa); the specific pressure interval range can be set according to the regulating springs of the first one-way valve and the second one-way valve, and the action performance and the opening and closing are not influenced by back pressure.
Drawings
FIG. 1 is a side view of a self-contained pressure interval flow valve shaft according to an embodiment of the present invention.
Fig. 2 is a front cross-sectional view of a self-contained pressure interval flow-through valve in accordance with an embodiment of the present invention.
Fig. 3 is an enlarged view at M in fig. 2.
Fig. 4 is a cross-sectional view at A-A in fig. 2.
Fig. 5 is a cross-sectional view at B-B in fig. 4.
Fig. 6 is a cross-sectional view at C-C in fig. 4.
Fig. 7 is a schematic diagram of the operation of an embodiment of the present invention.
Fig. 8 is a schematic view of the medium entering the pre-valve orifice X and the valve cap orifice X1 in sequence.
Fig. 9 is a cross-sectional view at D-D in fig. 8.
FIG. 10 is a cross-sectional view of FIG. 8 at A-A when the pressure is less than A megapascals.
FIG. 11 is a cross-sectional view of FIG. 8 at A-A as the medium enters the first and second plenums.
FIG. 12 is a cross-sectional view of FIG. 8 at A-A when the pressure reaches A megapascals.
Fig. 13 is a cross-sectional view at B-B in fig. 12.
FIG. 14 is a cross-sectional view of FIG. 8 at A-A when the pressure is less than B megapascals.
Fig. 15 is a cross-sectional view at E-E in fig. 14.
FIG. 16 is a cross-sectional view of FIG. 8 at A-A when the pressure reaches B megapascals.
FIG. 17 is a schematic view of FIG. 8 at A-A where media enters the first flow path and the second flow path.
Fig. 18 is a cross-sectional view at B-B in fig. 17.
FIG. 19 is a schematic view of the media moving the valve stem downward.
FIG. 20 is a cross-sectional view of FIG. 8 at A-A under pressure of less than B megapascals.
Fig. 21 is a cross-sectional view at C-C in fig. 20.
Detailed Description
In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1 to 7, a self-operated pressure interval circulation valve comprises a valve body 1, a valve seat 3, a valve core 4, a valve rod 7 and a valve cover 12, wherein the valve seat 3 is fixedly arranged in the valve body 1, the valve core 4 is matched with the valve seat 3, the valve cover 12 is fixedly connected to a control end of the valve body 1, the upper end of the valve rod 7 sequentially penetrates through the control end of the valve body 1 and the valve cover 12, the lower end of the valve rod 7 drives the valve core 4 to move up and down so as to open or close the valve, the upper end of the valve cover 12 is connected with a differential pressure valve 21 for driving the valve rod 7, an inlet end of the valve body 1 is provided with a valve front small hole x, an outlet end of the valve body 1 is provided with a valve rear small hole y, the valve front small hole x controls the differential pressure valve 21 to drive the valve rod 7 to move up so as to open the valve, the opening pressure of the first one-way valve 36 is larger than zero, the opening pressure of the differential pressure valve 21 controls the valve rod 7 to move down through a second one-way valve 37 so as to close the valve, the opening pressure of the second one-way valve 37 is larger than the opening pressure of the first one-way valve 36 and the opening pressure valve is larger than the maximum pressure of a pipeline 21, the differential pressure is connected with the differential pressure valve y through the small hole y, and the differential pressure valve 21 is prevented from flowing back through the small hole 21.
In the embodiment of the invention, the self-operated pressure interval circulation valve further comprises an outer cylinder 16, a middle piston cylinder 17 and an outer piston cylinder 19, wherein the differential pressure valve 21 comprises a main valve body 15 and a gland 14, the gland 14 is arranged on the outer side of the lower end of the main valve body 15 to seal a flow passage in the main valve body 15, the upper end of the valve cover 12 is fixedly connected with the lower end of the outer cylinder 16 through the main valve body 15, the outer edge of the outer piston cylinder 19 is fixedly connected with the upper end of the outer cylinder 16, the upper end of the valve rod 7 penetrates through the main valve body 15 and then extends into the inner cavity of the outer piston cylinder 19, the middle piston cylinder 17 is fixed at the upper end of the valve rod 7 through a valve rod locking nut 18, the outer wall of the middle piston cylinder 17 is in sliding fit with the inner wall of the outer piston cylinder 19, and the inner wall of the middle piston cylinder 17 is in sliding fit with the outer wall of a central tube protruding upwards of the main valve body 15.
In the embodiment of the present invention, the differential pressure valve 21 further includes a primary piston 29 and a secondary piston 32 that are integrally connected, where the primary piston 29 is disposed in a left air chamber of the primary valve body 15, a spring that applies a left pre-tightening force to the primary piston 29 is disposed in the left air chamber, the primary piston 29 divides the left air chamber into a first air chamber a, a second air chamber b and a third air chamber c in sequence from left to right, the first air chamber a is communicated with an outlet end of the first check valve 36, an inlet end of the first check valve 36 is communicated with the small hole x in front of the valve, and the second air chamber b is respectively communicated with an outlet end of the first check valve 36 and an inlet end of the second check valve 37; the auxiliary piston 32 is placed in the right air chamber of the main valve body 15, the auxiliary piston 32 divides the right air chamber into a fourth air chamber d, a fifth air chamber e and a sixth air chamber f in sequence from left to right, the fifth air chamber e is communicated with the valve rear small hole y when the auxiliary piston 32 is positioned at the right end, the sixth air chamber f is communicated with the outlet end of the third one-way valve 38, and the sixth air chamber f is communicated with the valve rear small hole y when the auxiliary piston 32 is positioned at the left end.
In the embodiment of the present invention, the inner cavity of the outer cylinder 16 forms a seventh air chamber g, the seventh air chamber g is respectively communicated with the outlet end of the second check valve 37 and the inlet end of the third check valve 38, the inner cavity of the outer piston cylinder 19 forms an eighth air chamber h, the eighth air chamber h is communicated with the seventh air chamber g through a through hole on the outer piston cylinder 19, the inner cavity of the middle piston cylinder 17 forms a ninth air chamber q, and the third air chamber c and the fifth air chamber e are respectively communicated with the ninth air chamber q through channels in the main valve body 15.
In the embodiment of the invention, a stepped hole for the valve rod 7 to pass through is arranged in the center of the valve cover 12, a lip seal ring 28, a filler spacer ring 25 and a filler 24 which encircle the periphery of the valve rod 7 are sequentially arranged at the upper part of the stepped hole from bottom to top, the filler 24 is preferably but not limited to flexible graphite, the filler 24 is fixed in the stepped hole of the valve cover 12 by a filler locking nut 22, and a sliding bearing 23 which is in sliding fit with the outer wall of the valve rod 7 is arranged at the inner side of the lower part of the filler locking nut 22; the inner wall of the packing spacer ring 25 is provided with an O-shaped ring 26 in sealing fit with the outer wall of the valve rod 7, and the outer wall of the packing spacer ring 25 is provided with an O-shaped ring 27 in sealing fit with the inner wall of the stepped hole.
In the embodiment of the invention, the valve seat 3 is provided with O-shaped rings 2 and 6 in sealing fit with the valve body 1, and the valve seat 3 is also provided with a sealing ring 5 in sealing fit with the valve core 4. The valve core 4 is preferably but not limited to a flashboard 4, and the lower end of the valve rod 7 is fixedly connected with the top of the flashboard 4 through a connecting sleeve 8.
In the embodiment of the invention, the valve cover 12 is provided with a central pipe protruding downwards, the periphery of the central pipe protruding downwards of the valve cover 12 is sleeved with a lip-shaped sealing ring 9 matched with the opening of the control end of the valve body 1, and sealing O-shaped rings 10 and 11 are arranged on each contact surface between the valve cover 12 and the valve body 1.
In the embodiment of the invention, the outer edge of the lower end of the valve cover 12 is fixed at the control end of the valve body 1 through a fastener 13, the outer edge of the upper end of the valve cover 12 is sequentially fixed at the outer edges of the lower ends of the main valve body 15 and the outer cylinder 16 through a fastener 35, and the outer edge of the piston outer cylinder 19 is fixed at the outer edge of the upper end of the outer cylinder 16 through a fastener 20. The fasteners 13, 20, 35 described above are preferably, but not limited to, an equal length stud and hex nut combination.
The main performance and index of the self-operated pressure interval flow valve are as follows: 1) Setting pressure deviation: 2% set pressure; 2) Exceeding the pressure: setting pressure is less than or equal to 8%; 3) Opening and closing differential pressure: setting pressure is less than or equal to 8 percent. The self-operated pressure interval flow valve is characterized in that: 1) The action performance and the opening height are not affected by the back pressure; 2) The hard sealing material is adopted, so that good sealing performance of the valve before and after the action is ensured; 3) The valve can be fully opened and fully closed under smaller excess pressure; 4) The adjusting pressure and the opening and closing pressure difference can be conveniently adjusted.
For example, when the pipeline pressure where the valve is located is changed from 0 to C (MPa), that is, the maximum pressure of the pipeline connected with the valve is C (MPa), the opening pressure of the first one-way valve 36 is A (MPa), the opening pressure of the second one-way valve 37 is B (MPa), wherein 0 < A < B < C (MPa), the valve is opened to enable the pipeline to circulate when reaching a specific pressure interval A-B (MPa), and the valve is closed to enable the pipeline to be blocked when not reaching the specific pressure interval. Referring to fig. 1 to 7, the control method of the self-operated pressure interval flow valve includes the following steps:
(1) When the pipeline pressure of the valve reaches A (MPa), the thrust of the piston 30 of the first one-way valve 36 reaches the pre-pressing force of the pressure regulating spring 31, so that the channel of the first one-way valve 36 circulates, a medium enters the pressure difference valve 21 from the small hole x in front of the valve and enters the lower part of the valve rod 7 through the pressure difference valve 21, and the valve rod 7 is lifted to open by means of the upward thrust of the medium;
(2) When the pressure of the pipeline where the valve is positioned is increased to B (MPa), the thrust of the piston 33 of the second one-way valve 37 reaches the pre-tightening pressure of the pressure regulating spring 34, so that the channel of the second one-way valve 37 circulates, a medium enters the upper part of the valve rod 7 through the pressure difference valve 21, and the valve rod 7 is pushed to move downwards to the valve closing state by virtue of the downward thrust of the medium;
(3) When the pipeline pressure of the valve falls below B (MPa), the passage of the second one-way valve 37 is closed, the medium reenters the lower part of the valve rod 7 through the differential pressure valve 21, the valve rod 7 ascends to open the valve, and the medium above the valve rod 7 is discharged to the small hole y behind the valve through the third one-way valve 38;
(4) When the pipe pressure of the valve falls further below a (MPa), the passage of the first check valve 36 is also closed, medium no longer enters the differential pressure valve 21 from the pre-valve orifice x, medium below the valve stem 7 is discharged through the differential pressure valve 21 to the post-valve orifice y, and the valve stem 7 descends again to close the valve.
In the embodiment of the present invention, in the step (1), when the channel of the first check valve 36 circulates, the medium enters the inner cavity of the cylinder 17 in the piston (i.e. the ninth air chamber q) through the small hole x in front of the valve on the left side of the valve, and the valve rod 7 is jacked up to open the valve by the thrust of the medium.
The method comprises the following steps: when the pressure is gradually increased after the medium is introduced into the pipeline where the valve is positioned, the valve is in a closed state, and the medium enters the small hole x in front of the valve through the valve inlet, as shown in fig. 8; a first orifice X1, see fig. 8 and 9, which flows along the valve front orifice X of the valve body 1 toward the valve cover 12; after exiting the first orifice X1 of the valve cap 12, the medium flows into the second orifice X2 of the valve cap 12, see fig. 9, flows into the main valve body 15 of the differential pressure valve 21 through the second orifice X2 of the valve cap 12, reaches the piston 30 of the first check valve 36, and thus the pressure does not reach the preload of the pressure regulating spring 31 of the first check valve 36, so that the piston 30 of the first check valve 36 is in a closed state, see fig. 10, and the medium also fails to enter the first air chamber a of the differential pressure valve 21. As the pressure rises to a mpa, the thrust of the medium pressure on the piston 30 of the first check valve 36 reaches the pretightening force set by the pressure regulating spring 31, the piston 30 of the first check valve 36 opens, see fig. 11, the medium enters the first air chamber a and the second air chamber b, the main piston 29 and the auxiliary piston 32 of the differential pressure valve 21 are at the left side position due to the pretightening force of the spring in the second air chamber b, and the second air chamber b is communicated with the third air chamber c, see fig. 11. Since the system pressure does not reach B mpa, the piston 33 of the second one-way valve 37 is in the closed state, the passage is not open, see fig. 12; the medium enters the inner cavity of the cylinder 17 in the piston (namely, the ninth air chamber q) through the third air chamber c through the third small hole X3 of the main valve body 15, at this time, the fifth air chamber e is in a closed state due to the fact that the system pressure does not reach B mpa, the piston 33 of the second one-way valve 37 is not communicated, see fig. 13, so that no medium flows into the inner cavity of the outer cylinder 16 (namely, the seventh air chamber g), at this time, no medium enters from the small hole y after the valve because the valve is in a closed state, and no medium exists because the sixth air chamber f is communicated with the small hole y after the valve. Thus, the ninth air chamber q forms a pressure chamber pushing the piston cylinder 17 upward, and the valve opens to circulate the pipe, see fig. 14 and 15.
In the embodiment of the invention, in the step (2), when the pipeline pressure is increased to B (MPa), the main piston 32 and the auxiliary piston 32 of the differential pressure valve 21 move to the right to the sealing surface of the piston to block the medium from reaching the inner cavity of the middle cylinder 17 of the piston (namely, the ninth air chamber q), meanwhile, as the channel of the second one-way valve 37 circulates, the medium reaches the inner cavity of the outer cylinder 19 of the piston (namely, the eighth air chamber h) and pushes the valve rod 7 to move downwards to the valve to be closed by means of the medium thrust, and as the inner cavity area of the outer cylinder 19 of the piston is larger than the inner cavity area of the middle cylinder 17 of the piston, the problem that the valve medium flows backwards through the small hole y behind the valve on the right side of the valve is effectively solved.
The method comprises the following steps: when the pressure of the system pipeline continues to rise to B megapascals, the difference between the thrust generated by the medium on the piston surface of the first air chamber a and the thrust generated by the medium on the piston surface of the second air chamber B reaches the pretightening force set by the spring of the second air chamber B, the main piston 29 and the auxiliary piston 32 of the differential pressure valve 21 move rightwards and gradually make the sealing surfaces between the second air chamber B and the third air chamber c form a sealing pair, as shown in fig. 16; as the system pipe pressure continues to rise to B mpa, the thrust force generated by the pressure on the piston 33 of the second check valve 37 reaches the pretightening force set by the pressure regulating spring 34, the piston 33 of the second check valve 37 is opened, see fig. 17 and 18, the medium enters the eighth air chamber h through the small hole communicating with the eighth air chamber h through the seventh air chamber g, the main piston 29 and the auxiliary piston 32 of the differential pressure valve 21 move rightward to make the two paths of flow paths of the first flow path Y1 and the second flow path Y2 of the fifth air chamber e communicated, the first flow path Y1 enters the ninth air chamber q through the differential pressure valve 21, see fig. 19, and the second flow path Y2 flows into the valve rear pipe from the valve rear small hole Y after flowing into the valve cover 12 through the differential pressure valve 21. Because the contact area of the medium in the eighth air chamber h to the cylinder 17 in the piston is larger than the contact area of the medium in the ninth air chamber q to the cylinder 17 in the piston, the pressure difference generated by the medium causes the valve rod 7 to move downwards, as shown in fig. 19, the first flow passage Y1 and the second flow passage Y2 of the fifth air chamber e are communicated, the valve rod 7 moves downwards so that the medium in the ninth air chamber q flows into the pipeline behind the valve from the small hole Y behind the valve after sequentially flowing through the fifth air chamber e and the second flow passage Y2, and finally the valve is closed to separate the pipeline.
In the embodiment of the invention, in the step (3), when the pressure of the pipeline is lower than B (MPa), the main piston 32 and the auxiliary piston 32 of the differential pressure valve 21 move leftwards by virtue of the thrust of a spring, the medium reenters the inner cavity of the middle cylinder 17 of the piston, the valve rod 7 rises to open the valve so as to enable the pipeline to circulate, and meanwhile, the inner cavity pressure of the outer cylinder 16 of the valve is decompressed to the small hole y behind the valve (namely the pipeline behind the valve) through the third one-way valve 38, so that the flexibility of opening and closing the valve is ensured.
The method comprises the following steps: when the system pressure is reduced below B megapascals again, the main piston 32 and the auxiliary piston 32 of the differential pressure valve 21 return to the left side again, meanwhile, the piston 33 of the second one-way valve 37 is closed, the medium enters the ninth air chamber q again and cannot enter the eighth air chamber h, at the moment, the medium in the ninth air chamber q generates thrust to the piston middle cylinder 17 to pull the valve rod 7 to move upwards to open the valve again, the main piston 29 and the auxiliary piston 32 of the differential pressure valve 21 move leftwards, two flow passage small holes of the sixth air chamber f are communicated, as shown in fig. 11, the medium in the eighth air chamber h reaches the sixth air chamber f through the third one-way valve 38 after passing through the seventh air chamber g, as shown in fig. 20 and 21, and finally flows into the rear valve pipeline through the rear valve small hole y, and the rear valve medium cannot flow back to the seventh air chamber g through the rear valve small hole y due to the effect of the third one-way valve 38, so that the differential pressure valve 21 can work normally.
In the embodiment of the present invention, when the system pressure continues to decrease below a mpa in step (4), the piston 30 of the first check valve 36 is closed, the valve is closed again, and the pipe is blocked and does not circulate.
The present invention is not limited to the above embodiments, but can be modified, equivalent, and modified in any way by those skilled in the art without departing from the scope of the present invention.
Claims (7)
1. The utility model provides a self-operated pressure interval circulation valve, includes valve body, disk seat, case, valve rod and valve gap, the disk seat is fixed to be set up in the valve body, the case cooperatees with the disk seat, valve gap fixed connection is on the control end of valve body, the control end and the valve gap of valve body are passed in proper order to the upper end of valve rod, the lower extreme of valve rod drives the case and reciprocates and open or close the valve, its characterized in that: the upper end of the valve cover is connected with a differential pressure valve for driving the valve rod, the inlet end of the valve body is provided with a valve front small hole, the outlet end of the valve body is provided with a valve rear small hole, the valve front small hole drives the valve rod to move upwards through a first one-way valve to open the valve, the opening pressure of the first one-way valve is larger than zero, the differential pressure valve moves downwards through a second one-way valve to close the valve, the opening pressure of the second one-way valve is larger than the opening pressure of the first one-way valve and smaller than the maximum pressure of a valve connecting pipeline, the differential pressure valve discharges a medium through the valve rear small hole, and the differential pressure valve is connected with a third one-way valve for preventing the medium from flowing back from the valve rear small hole;
the pressure difference valve comprises a main valve body and a gland, wherein the gland is arranged outside the lower end of the main valve body so as to seal a flow channel in the main valve body, the upper end of the valve cover is fixedly connected with the lower end of the outer cylinder through the main valve body, the outer edge of the outer cylinder of the piston is fixedly connected with the upper end of the outer cylinder of the piston, the upper end of the valve rod penetrates through the main valve body and then stretches into the inner cavity of the outer cylinder of the piston, the middle cylinder of the piston is fixed at the upper end of the valve rod through a valve rod locking nut, the outer wall of the middle cylinder of the piston is in sliding fit with the inner wall of the outer cylinder of the piston, and the inner wall of the middle cylinder of the piston is in sliding fit with the outer wall of the central pipe which protrudes upwards from the main valve body;
the differential pressure valve further comprises a main piston and an auxiliary piston which are connected into a whole, the main piston is placed in a left air chamber of the main valve body, a spring for applying left pretightening force to the main piston is arranged in the left air chamber, the main piston sequentially separates the left air chamber into a first air chamber, a second air chamber and a third air chamber from left to right, the first air chamber is communicated with an outlet end of the first one-way valve, an inlet end of the first one-way valve is communicated with a small hole in front of the valve, and the second air chamber is respectively communicated with an outlet end of the first one-way valve and an inlet end of the second one-way valve; the auxiliary piston is arranged in a right air chamber of the main valve body, the auxiliary piston sequentially divides the right air chamber into a fourth air chamber, a fifth air chamber and a sixth air chamber from left to right, the fifth air chamber is communicated with the valve back small hole when the auxiliary piston is positioned at the right end, the sixth air chamber is communicated with the outlet end of the third one-way valve, and the sixth air chamber is communicated with the valve back small hole when the auxiliary piston is positioned at the left end;
the inner cavity of the outer cylinder forms a seventh air chamber, the seventh air chamber is respectively communicated with the outlet end of the second one-way valve and the inlet end of the third one-way valve, the inner cavity of the outer cylinder of the piston forms an eighth air chamber, the eighth air chamber is communicated with the seventh air chamber through a through hole on the outer cylinder of the piston, the inner cavity of the middle cylinder of the piston forms a ninth air chamber, and the third air chamber and the fifth air chamber are respectively communicated with the ninth air chamber through passages in the main valve body.
2. The self-contained pressure interval flow-through valve of claim 1, wherein: the center of the valve cover is provided with a stepped hole for the valve rod to pass through, the upper part of the stepped hole is sequentially provided with a lip-shaped sealing ring, a filler spacer ring and filler which encircle the periphery of the valve rod from bottom to top, the filler is fixed in the stepped hole of the valve cover by a filler locking nut, and the inner side of the lower part of the filler locking nut is provided with a sliding bearing which is in sliding fit with the outer wall of the valve rod; the inner wall of the packing spacer ring is provided with an O-shaped ring in sealing fit with the outer wall of the valve rod, and the outer wall of the packing spacer ring is provided with an O-shaped ring in sealing fit with the inner wall of the stepped hole.
3. The self-contained pressure interval flow-through valve of claim 1, wherein: the valve core is a flashboard, and the lower end of the valve rod is fixedly connected with the top of the flashboard through a connecting sleeve.
4. A self-contained pressure interval flow-through valve according to claim 1 or 3, characterized in that: the valve seat is provided with an O-shaped ring in sealing fit with the valve body, and the valve seat is also provided with a sealing ring in sealing fit with the valve core.
5. The self-contained pressure interval flow-through valve of claim 1, wherein: the valve cover is provided with a central tube protruding downwards, a lip-shaped sealing ring matched with an opening of a control end of the valve body is sleeved on the periphery of the central tube protruding downwards, and O-shaped rings for sealing are arranged on all contact surfaces between the valve cover and the valve body.
6. The self-contained pressure interval flow-through valve of claim 1, wherein: the outer edge of the lower end of the valve cover is fixed at the control end of the valve body through a fastener, the outer edge of the upper end of the valve cover is sequentially fixed at the outer edges of the lower ends of the main valve body and the outer cylinder through a fastener, and the outer edge of the outer cylinder of the piston is fixed at the outer edge of the upper end of the outer cylinder through a fastener.
7. A control method of the self-operated pressure interval flow valve according to claim 1, comprising the steps of:
(1) When the pressure of a pipeline where the valve is positioned reaches the opening pressure of the first one-way valve, the thrust of a piston of the first one-way valve reaches the pre-tightening pressure of the pressure regulating spring, so that a channel of the first one-way valve circulates, a medium enters the differential pressure valve from a small hole in front of the valve and enters the lower part of the valve rod through the differential pressure valve, and the valve rod is lifted to open the valve by means of upward thrust of the medium;
(2) When the pressure of the pipeline where the valve is positioned is increased to the opening pressure of the second one-way valve, the thrust of the piston of the second one-way valve reaches the pre-tightening pressure of the pressure regulating spring, so that a channel of the second one-way valve circulates, a medium enters the upper part of the valve rod through the pressure difference valve, and the valve rod is pushed to move downwards to the valve to be closed by virtue of the downward thrust of the medium;
(3) When the pipeline pressure of the valve is reduced to be lower than the opening pressure of the second one-way valve, the channel of the second one-way valve is cut off, the medium reenters the lower part of the valve rod through the differential pressure valve, the valve rod ascends to open the valve, and the medium above the valve rod is discharged to the small hole behind the valve through the third one-way valve;
(4) When the pressure of the pipeline where the valve is located is further reduced to be lower than the opening pressure of the first one-way valve, the channel of the first one-way valve is also cut off, medium does not enter the differential pressure valve from the small hole in front of the valve, medium below the valve rod is discharged to the small hole behind the valve through the differential pressure valve, and the valve rod is reduced again to close the valve.
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| CN201710135275.XA CN106678385B (en) | 2017-03-08 | 2017-03-08 | Self-operated pressure interval flow valve and control method thereof |
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| CN201710135275.XA CN106678385B (en) | 2017-03-08 | 2017-03-08 | Self-operated pressure interval flow valve and control method thereof |
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| CN106678385B true CN106678385B (en) | 2024-02-23 |
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| CN109260903A (en) * | 2018-09-03 | 2019-01-25 | 珠海市思卡净化技术有限公司 | A kind of working method of novel compositions valve type double-tower air clarifier |
| CN110735983B (en) * | 2019-11-21 | 2024-04-26 | 杭州冠宏人防工程设备有限公司 | Transient sealing executing mechanism of civil air defense safety door |
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