CN117432813B - Spring type multi-stage throttling emptying valve - Google Patents
Spring type multi-stage throttling emptying valve Download PDFInfo
- Publication number
- CN117432813B CN117432813B CN202311748693.8A CN202311748693A CN117432813B CN 117432813 B CN117432813 B CN 117432813B CN 202311748693 A CN202311748693 A CN 202311748693A CN 117432813 B CN117432813 B CN 117432813B
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- valve
- sealing
- valve seat
- seat
- sleeve
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- 238000007789 sealing Methods 0.000 claims abstract description 190
- 239000012530 fluid Substances 0.000 claims abstract description 15
- 238000012856 packing Methods 0.000 claims description 23
- 230000002093 peripheral effect Effects 0.000 claims description 20
- 239000004519 grease Substances 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 claims 1
- 239000000243 solution Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 230000007774 longterm Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/02—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with screw-spindle
- F16K1/04—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with screw-spindle with a cut-off member rigid with the spindle, e.g. main valves
-
- 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
-
- 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
-
- 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/46—Attachment of sealing rings
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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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/46—Attachment of sealing rings
- F16K1/465—Attachment of sealing rings to the valve seats
-
- 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/48—Attaching valve members to screw-spindles
- F16K1/482—Attaching valve members to screw-spindles with a collar on the spindle or a groove in the spindle, by which a fixing element is supported, the spindle reaching into the valve member
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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
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
-
- 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
- F16K39/00—Devices for relieving the pressure on the sealing faces
- F16K39/02—Devices for relieving the pressure on the sealing faces for lift 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
- F16K41/00—Spindle sealings
- F16K41/003—Spindle sealings by fluid
-
- 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
-
- 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
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
- F16K47/023—Means in valves for absorbing fluid energy for preventing water-hammer or noise for preventing water-hammer, e.g. damping of the valve movement
-
- 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
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/08—Means in valves for absorbing fluid energy for decreasing pressure or noise level and having a throttling member separate from the closure member, e.g. screens, slots, labyrinths
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
- Lift Valve (AREA)
Abstract
The invention belongs to the field of hydraulic valves, and in particular relates to a spring type multi-stage throttling emptying valve, which comprises the following components: the valve comprises a valve body, a valve cover, an end cover, a valve rod, a valve seat, a valve sleeve, a valve core and a throttling sleeve; the valve body is internally provided with the valve seat, the throttling sleeve, the valve core and the valve sleeve from bottom to top in sequence, the outer circumferential surface of the valve seat is provided with a plurality of first throttling holes, the outer circumferential surface of the valve sleeve close to the lower side is provided with a plurality of second throttling holes in a staggered mode, the outer circumferential surface of the middle part of the throttling sleeve is provided with a third throttling hole, a multistage sealing structure is arranged between the valve seat and the valve core, and the multistage sealing structure is used for sealing a fluid channel from the first throttling hole to the second throttling hole. The air release valve can prevent pressure medium leakage under low pressure working conditions, and simultaneously improves the sealing performance of the valve under high pressure working conditions through multiple seals.
Description
Technical Field
The invention belongs to the field of hydraulic valves, and particularly relates to a spring type multi-stage throttling emptying valve.
Background
The throttle blow-down valve is widely applied to pipelines of petroleum and natural gas equipment, chemical industry equipment, boilers and other equipment, and is used for overhauling and blow-down of pipelines in emergency. Because the vent valve is often used in the occasions of inflammable, explosive and high pressure difference of media, how to ensure the sealing performance of the vent valve when the vent valve is closed and the throttling performance when the vent valve is opened are particularly critical.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a spring type multi-stage throttling blow-off valve, which can ensure the sealing performance of the blow-off valve when being closed and the throttling performance when being blown off.
In order to achieve the above object, the present invention provides the following technical solutions:
a spring-loaded multi-stage throttling blow-down valve, the blow-down valve comprising: the valve comprises a valve body, a valve cover, an end cover, a valve rod, a valve seat, a valve sleeve, a valve core and a throttling sleeve; the valve cover and the end cover are respectively positioned at the upper end and the lower end of the valve body, the upper end of the valve cover is provided with a bracket, and the lower end of the valve rod sequentially passes through the bracket and the valve cover and is in transmission connection with the valve core; the upper end of the valve rod is provided with a threaded section, a hand wheel is arranged on the threaded section, and a valve rod nut matched with the threaded section at the upper end of the valve rod is arranged in the bracket; a sealing packing is further arranged between the valve rod and the valve cover, a packing pressing ring is arranged at the upper end of the sealing packing, a packing pressing cover is further arranged in the support, the lower side of the packing pressing cover is abutted against the packing pressing ring, and the upper side of the packing pressing cover is abutted against the support through a threaded fastener;
the valve seat, the throttling sleeve, the valve core and the valve sleeve are sequentially arranged in the valve body from bottom to top, wherein an installation boss is arranged at the upper end of the valve seat and is positioned in a valve seat installation groove arranged in the valve body, and a plurality of first throttling holes are formed in the peripheral surface of the valve seat; the lower end of the valve sleeve is abutted against the mounting boss of the valve seat, the other end of the valve sleeve is abutted against the valve cover, and a plurality of second orifices are staggered on the peripheral surface of the valve sleeve close to the lower side; the throttle sleeve is positioned in the valve seat, the lower end of the throttle sleeve is provided with a throttle sleeve sealing surface, the throttle sleeve sealing surface is in sliding fit with the inner peripheral surface of the valve seat so as to open or close the first throttle hole, the upper end of the throttle sleeve is provided with a first threaded part, the first threaded part is in transmission connection with the valve core, and the outer peripheral surface of the middle part of the throttle sleeve is provided with a third throttle hole; the valve comprises a valve core, a pressing ring and a valve rod, wherein a first cavity for inserting the valve rod is formed at the upper end of the valve core, a second threaded part matched with the pressing ring is arranged in the first cavity, and the valve rod is connected with the valve core through the pressing ring and a gasket after the valve rod is inserted into the first cavity; the outer peripheral surface of the valve core is in sliding fit with the inner peripheral surface of the valve sleeve so as to open or close the second throttling hole, a multi-stage sealing structure is arranged between the valve seat and the valve core, and the multi-stage sealing structure is used for closing a fluid channel flowing from the first throttling hole to the second throttling hole.
Preferably, the multi-stage sealing structure comprises: the valve seat comprises a valve seat, a valve core, a valve seat sealing ring and a valve seat sealing ring, wherein the valve core sealing ring is arranged at the lower end of the valve core; the valve seat is characterized in that the cross section of the spring seat is L-shaped, a plurality of springs are arranged between the long side of the L-shaped cross section and the valve core, a spring seat sealing part is arranged at the end part of the short side of the L-shaped cross section, the first sealing part and the second sealing part are adjacently arranged, and the height of the second sealing part is higher than that of the first sealing part in the axial direction of the valve seat; the first sealing part and the spring seat sealing part are matched with each other to form a first sealing structure, the second sealing part and the valve core sealing part are matched with each other to form a second sealing structure, the valve seat sealing ring and the valve core sealing part are matched with each other to form a third sealing structure, and the first sealing structure, the second sealing structure and the third sealing structure are sequentially arranged along the radial direction of the valve seat.
Preferably, the first sealing portion, the second sealing portion, the spring seat sealing portion and the valve core sealing portion are all cemented carbide layers, so that the first sealing structure and the second sealing structure form a metal hard sealing structure, and the third sealing structure forms a composite sealing structure.
Preferably, the mounting boss of the valve seat is provided with a valve seat upper mounting surface and a valve seat lower mounting surface, wherein the valve seat seal ring is positioned between the valve seat upper mounting surface and the valve core seal part, the inner ring of the valve seat seal ring is abutted against the valve seat, and the outer ring is abutted against the valve sleeve.
Preferably, the valve seat lower mounting surface is located in the valve seat mounting groove, a valve seat sealing groove is formed in the outer side of the valve seat lower mounting surface, and a second sealing ring is arranged in the valve seat sealing groove and used for sealing between the valve seat and the valve body.
Preferably, the width of the contact surface of the valve seat sealing ring and the valve core sealing part is larger than the width of the contact surface of the second sealing part and the valve core sealing part.
Preferably, three layers of second orifices are staggered on the peripheral surface of the valve sleeve close to the lower side.
Preferably, a valve core boss is arranged at the lower end of the valve core, the valve core sealing part is arranged at the end part of the valve core boss, a plurality of spring mounting holes are formed in the inner side of the valve core boss along the circumferential direction, one end of a spring is abutted to the bottom of the spring mounting hole, and the other end of the spring is abutted to the spring seat; the lower extreme of case is provided with the second cavity, the second cavity inboard is provided with the third screw thread portion of first screw thread portion complex.
Preferably, a plurality of pressure balance holes are formed in the axial direction of the valve core, the first cavity is communicated with the second cavity through the pressure balance holes, a balance valve seat is arranged in the first cavity and located between the valve core and the valve rod, and a buffer hole is formed in the balance valve seat.
Preferably, an oiling channel is formed in the side face of the valve body, one end of the oiling channel is communicated with the valve seat mounting groove, and a check valve and a grease injection valve are sequentially mounted at the other end of the oiling channel.
Compared with the prior art, the spring type multistage throttling air release valve provided by the invention has the following beneficial technical effects:
1. the throttle relief valve in the prior art is sealed mainly by means of external load, and under the condition that medium pressure acts for a long time, the external load is loosened and is easy to leak. The air release valve is provided with the multistage sealing structure, the multistage sealing structure comprises the spring seat arranged between the valve seat and the valve core, the valve core is provided with a plurality of springs, the elastic force of the springs acts on the spring seat to push the spring seat to press the first sealing part, and therefore zero leakage of the first sealing structure can be guaranteed under high-pressure or low-pressure working conditions. Due to the action of the spring, even if the external load provided by the valve rod is loosened in the long-term use process, the sealing part can be pressed by the spring force to seal, so that the problem that the emptying valve is easy to leak under the low-pressure working condition is solved. And as the first sealing structure, the second sealing structure and the third sealing structure which are a multistage sealing structure are respectively arranged between the valve seat and the valve core, the sealing performance of the valve under the high-pressure working condition is obviously improved.
2. In the throttle blow-off valve in the prior art, under the high-pressure working condition, the medium flow speed is high, the pressure difference before and after throttling is large, and the high-speed flowing fluid is easy to damage the valve sealing part and the throttling surface. In the throttling air release valve provided by the invention, the first throttling holes are uniformly distributed around the valve seat, the plurality of rows of second throttling holes are uniformly distributed at the bottom of the valve sleeve, and the third throttling holes are uniformly distributed around the throttling sleeve. The high-pressure medium flows through a first throttling hole at the bottom of the valve seat, and through the primary throttling effect of the throttling sleeve, the throttled medium performs secondary throttling through a third throttling hole on the throttling sleeve, then flows through the valve core and the valve seat sealing part, and reaches a second throttling hole on the valve sleeve to perform tertiary throttling. Through multistage throttling effect, satisfy the performance of valve under the high pressure operating mode, reduce high pressure fluid and wash away sealing part, prolong the life of valve.
3. The conventional structure of the emptying valve has no valve seat for injecting grease, and the valve cannot be sealed in an emergency when the valve is leaked. According to the invention, the grease injection hole is arranged on the valve body, and the check valve and the grease injection valve are arranged, so that the valve can normally inject grease to carry out emergency sealing under the state of pressure.
4. By arranging the pressure balance structure on the valve core, the pressure balance of the upper end face and the lower end face of the valve core is ensured, and the vent valve is convenient to open and close.
Drawings
FIG. 1 is a schematic front view of a multi-stage throttle blow-down valve;
FIG. 2 is a schematic side view of a multi-stage throttle blow-down valve;
FIG. 3 is a schematic view of a valve seat;
FIG. 4 is a schematic structural view of the valve sleeve;
FIG. 5 is a schematic structural view of a valve core;
FIG. 6 is a schematic structural view of a throttle sleeve;
FIG. 7 is a partial enlarged view at a multi-stage throttle blow-down valve A;
FIG. 8 is a schematic view of a multi-stage throttle vent valve in a closed sealing condition;
FIG. 9 is a schematic view of a structure of a multi-stage throttle blow-down valve in a throttle controlled pressure state;
fig. 10 is a schematic structural view of the multi-stage throttle blow-down valve in a fully open blow-down state.
Wherein the reference symbols in the figures have the following meanings:
1. a valve body; 2. a valve cover; 3. an end cap; 4. a valve stem; 5. a valve seat; 6. a valve sleeve; 7. a valve core; 8. a throttle sleeve; 9. a bracket; 10. a valve stem nut; 11. a packing gland; 12. a packing press ring; 13. sealing filler; 14. a hand wheel; 15. a pressing ring; 16. a gasket; 17. a grease injection valve; 18. a check valve; 19. a spring seat;
51. a first orifice; 52. a first sealing part; 53. a second sealing part; 54. a valve seat upper mounting surface; 55. a valve seat seal ring; 56. a valve seat lower mounting surface; 57. sealing grooves of the valve seat;
61. a second orifice;
71. a valve core boss; 72. a valve core sealing part; 73. a spring mounting hole; 74. a pressure balance hole; 75. a third threaded portion; 76. a second threaded portion; 77. a balance valve seat;
81. a third orifice; 82. a first threaded portion; 83. a throttle sleeve sealing surface;
101. a valve seat mounting groove; 191. and a spring seat sealing part.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It will be apparent that the described embodiments are some, but not all, embodiments of the invention.
Thus, the following detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is merely representative of some embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, under the condition of no conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, the terms "upper", "lower", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or an azimuth or a positional relationship conventionally put in use of the inventive product, or an azimuth or a positional relationship conventionally understood by those skilled in the art, such terms are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Referring to fig. 1 to 10, the invention provides a spring type multi-stage throttling blow-down valve, which comprises: a valve body 1, a valve cover 2, an end cover 3, a valve rod 4, a valve seat 5, a valve sleeve 6, a valve core 7 and a throttling sleeve 8. The valve cover 2 and the end cover 3 are respectively positioned at the upper end and the lower end of the valve body 1, a bracket 9 is arranged at the upper end of the valve cover 2, and the lower end of the valve rod 4 sequentially passes through the bracket 9 and the valve cover 2 and is in transmission connection with the valve core 7; the upper end of the valve rod 4 is provided with a threaded section, a hand wheel 14 is arranged on the threaded section, and a valve rod nut 10 matched with the threaded section at the upper end of the valve rod 4 is arranged in the bracket 9. And a sealing packing 13 is further arranged between the valve rod 4 and the valve cover 2, a packing pressing ring 12 is arranged at the upper end of the sealing packing 13, a packing pressing cover 11 is further arranged in the bracket 9, the lower side of the packing pressing cover 11 is abutted against the packing pressing ring 12, the upper side is abutted against the bracket 9 through a threaded fastener, and the sealing pretightening force of the sealing packing 13 can be adjusted through adjusting the threaded fastener.
A valve seat 5, a throttling sleeve 8, a valve core 7 and a valve sleeve 6 are sequentially arranged in the valve body 1 from bottom to top, wherein an installation boss is arranged at the upper end of the valve seat 5 and is positioned in a valve seat installation groove 101 arranged in the valve body 1, and a plurality of first throttling holes 51 are formed in the peripheral surface of the valve seat 5; the lower end of the valve sleeve 6 is abutted against the mounting boss of the valve seat 5, the other end is abutted against the valve cover 2, and three layers of second orifices 61 are staggered on the peripheral surface of the valve sleeve 6 close to the lower side; the throttle sleeve 8 is positioned in the valve seat 5, the lower end of the throttle sleeve 8 is provided with a throttle sleeve sealing surface 83, the throttle sleeve sealing surface 83 is in sliding fit with the inner peripheral surface of the valve seat 5 so as to open or close the first throttle hole 51, the upper end of the throttle sleeve is provided with a first thread part 82, the first thread part 82 is in transmission connection with the valve core 7, and the outer peripheral surface of the middle part of the throttle sleeve 8 is provided with a third throttle hole 81; the upper end of the valve core 7 is provided with a first cavity for inserting the valve rod 4, a second threaded part 76 matched with the pressing ring 15 is arranged in the first cavity, and the valve rod 4 is connected with the valve core 7 through the pressing ring 15 and the gasket 16 after the valve rod 4 is inserted into the first cavity; the outer peripheral surface of the valve body 7 is slidably fitted with the inner peripheral surface of the valve housing 6 to open or close the second orifice 61, and a multi-stage seal structure for closing a fluid passage flowing from the first orifice 51 to the second orifice 61 is provided between the valve seat 5 and the valve body 7.
In use, rotating the hand wheel 14 drives the valve stem 4 to rotate, because the valve stem 4 is in threaded engagement with the valve stem nut 10, the valve stem 4 moves upward at this time, and further drives the valve core 7 and the orifice sleeve 8 to slide upward along the axial direction of the valve sleeve 6, at this time, the pressure medium flows through the orifice sleeve 8 through the first orifice 51, and flows out of the second orifice 61 on the valve sleeve 6 through the third orifice 81 on the orifice sleeve 8.
Preferably, the multi-stage sealing structure comprises: a first sealing portion 52 and a second sealing portion 53 provided at the upper end of the valve seat 5, a spool sealing portion 72 provided at the lower end of the spool 7, a spring seat 19 located between the valve seat 5 and the spool 7, and a valve seat seal 55 located between the valve seat 5 and the spool 7; the cross section of the spring seat 19 is L-shaped, a plurality of springs are arranged between the long side of the L-shaped cross section and the valve core 7, a spring seat sealing part 191 is arranged at the end part of the short side of the L-shaped cross section, a first sealing part 52 and a second sealing part 53 are adjacently arranged, and the height of the second sealing part 53 is higher than that of the first sealing part 52 in the axial direction of the valve seat 5; the first sealing portion 52 and the spring seat sealing portion 191 cooperate with each other to form a first sealing structure, the second sealing portion 53 and the valve core sealing portion 72 cooperate with each other to form a second sealing structure, the valve seat sealing ring 55 and the valve core sealing portion 72 cooperate with each other to form a third sealing structure, and the first sealing structure, the second sealing structure and the third sealing structure are sequentially arranged along the radial direction of the valve seat 5.
Preferably, the first seal 52, the second seal 53, the spring seat seal 191 and the spool seal 72 are all cemented carbide layers such that the first seal structure, the second seal structure form a metal hard seal structure and the third seal structure forms a composite seal structure. Of course, the multi-stage seal structure of the present invention is not limited to the above embodiment, and the first seal structure, the second seal structure, and the third seal structure may be each provided with a soft seal structure, for example, sealing rings (typically, materials such as PTFE, fluororubber, and PEEK) are provided in the first seal portion 52 and the second seal portion 53, and a cemented carbide layer is not provided in the spring seat seal portion 191 and the valve element seal portion 72, so that the first seal structure, the second seal structure, and the third seal structure are soft seal structures. Alternatively, seal rings are provided at the first seal portion 52 and the second seal portion 53, and the spring seat seal portion 191 and the valve element seal portion 72 are provided with cemented carbide layers so that the first seal structure, the second seal structure, and the third seal structure are composite seal structures. According to the actual sealing requirement, different valve sealing reliability can be obtained by adopting the combination of the different sealing structures.
The throttle relief valve in the prior art is sealed mainly by means of external load, and under the condition that medium pressure acts for a long time, the external load is loosened and is easy to leak. The air release valve is provided with the multistage sealing structure, the multistage sealing structure comprises the spring seat arranged between the valve seat and the valve core, the valve core is provided with a plurality of springs, the elastic force of the springs acts on the spring seat to push the spring seat to press the first sealing part, and therefore zero leakage of the first sealing structure can be guaranteed under high-pressure or low-pressure working conditions. Due to the action of the spring, even if the external load provided by the valve rod is loosened in the long-term use process, the sealing part can be pressed by the spring force to seal, so that the problem that the emptying valve is easy to leak under the low-pressure working condition is solved. And as the first sealing structure, the second sealing structure and the third sealing structure which are a multistage sealing structure are respectively arranged between the valve seat and the valve core, the sealing performance of the valve under the high-pressure working condition is obviously improved.
Preferably, the mounting boss of the valve seat 5 is provided with the valve seat upper mounting surface 54 and the valve seat lower mounting surface 56, wherein the valve seat seal ring 55 is located between the valve seat upper mounting surface 54 and the valve element sealing portion 72, the inner ring of the valve seat seal ring 55 abuts against the valve seat 5, the outer ring abuts against the valve sleeve 6, the width of the contact surface of the valve seat seal ring 55 and the valve element sealing portion 72 is larger than the width of the contact surface of the second sealing portion 53 and the valve element sealing portion 72, and the height of the valve seat seal ring 55 is higher than the height of the second sealing portion 53 as seen in the axial direction of the valve seat 5 when the valve is in the fully opened state. The valve seat lower mounting surface 56 is located in the valve seat mounting groove 101, a valve seat seal groove 57 is provided on the outer side of the valve seat lower mounting surface 56, and a seal ring for sealing between the valve seat 5 and the valve body 1 is provided in the valve seat seal groove 57.
Preferably, the lower end of the valve core 7 is provided with a valve core boss 71, the end part of the valve core boss 71 is provided with a valve core sealing part 72, the inner side of the valve core boss 71 is provided with a plurality of spring mounting holes 73 along the circumferential direction, one end of a spring is abutted against the bottom of the spring mounting hole 73, and the other end is abutted against the spring seat 19; the lower end of the valve core 7 is provided with a second cavity, and the inside of the second cavity is provided with a third screw thread part 75 which is matched with the first screw thread part 82.
Preferably, a plurality of pressure balance holes 74 are formed in the axial direction of the valve core 7, the first cavity and the second cavity are communicated through the pressure balance holes 74, a balance valve seat 77 is arranged in the first cavity, the balance valve seat 77 is located between the valve core 7 and the valve rod 4, and a buffer hole is formed in the balance valve seat 77. After the valve is opened, the pressure medium flows through the throttling sleeve 8 through the first throttling hole 51, and enters the upper cavity of the valve after being buffered by the pressure balance hole 74 and the balance valve seat 77, so that the pressure balance of the upper end face and the lower end face of the valve core 7 is ensured, and the valve is conveniently opened and closed.
The spring type multistage throttling blow-down valve provided by the invention has three working states in the working process, namely a cut-off sealing state, a throttling control pressure state and a full-open blow-down state, and the working process of each working state is as follows:
cut-off sealing state:
the hand wheel 14 rotates clockwise to drive the valve rod 4 to rotate, and the threaded section on the valve rod 4 is matched with the valve rod nut 10 in a threaded manner to convert the rotation of the valve rod 4 into downward movement. When the spool sealing portion 72 is in contact with the seat seal ring 55 on the valve seat 5, a primary seal is formed, and at this time, the spring seat sealing portion 191 at the lower end of the spring seat 19 is not in contact with the first sealing portion 52 on the valve seat 5. Continuing to drive the valve spool 7 downwardly, the spool sealing portion 72 contacts the second sealing portion 53 on the valve seat 5 to form a primary hard seal. Subsequently, the valve spool 7 is further driven to move downward, and at this time, the spring seat 19 pushes the spring seat sealing portion 191 to be tightly fitted with the first sealing portion 52 under the action of the spring, so that a secondary hard seal is formed.
And (3) throttling the control pressure state:
the hand wheel 14 rotates anticlockwise, and the valve rod 4 moves upwards to drive the valve core 7 to move. The throttle sleeve 8 is in threaded fit with the bottom of the valve core 7, so that the throttle sleeve moves upwards together with the valve core 7, the first throttle holes 51 are opened, fluid enters the throttle sleeve 8 from the valve body cavity through the first throttle holes 51 uniformly distributed at the lower end of the valve seat 5, and the flow is reduced due to the reduction of the area of the fluid in the process of passing, so that primary throttling is performed. The fluid after primary throttling passes through third throttling holes 81 uniformly distributed at the upper end of the throttling sleeve 8 to perform secondary throttling. After the fluid after the secondary throttling flows through the spring seat sealing part 191, the first sealing part 52, the second sealing part 53 and the valve core sealing part 72, the fluid flushes dirt on the sealing parts, and the sealing parts are ensured to be clean. The fluid flowing through the sealing part passes through the second orifice 61 on the valve sleeve 6 and then enters the lower end of the valve to complete three-stage throttling for emptying. The flow of the fluid after three times of throttling is greatly reduced, and the device can be used for throttling under a high-pressure working condition, so that the phenomenon that the pipeline is shocked due to overlarge emptying flow is avoided, and the instrument and instrument after emptying are damaged due to overlarge flow fluctuation.
Full open state:
the valve core 7 continues to move upwards until the mechanical limit boss of the valve rod 4 reaches the mechanical limit concave of the valve cover. At this time, the valve element 7 is fully opened, the orifice sleeve 8 is fully separated from the first orifice 51 of the valve seat 5, and the valve element 7 is fully separated from the second orifice 61 of the valve sleeve 6. The throttle holes are not blocked, medium can flow through the throttle holes at full speed, and at the moment, the valve is in a full-open state, the emptying flow is maximum, and the emptying speed is highest.
In the throttle blow-off valve in the prior art, under the high-pressure working condition, the medium flow speed is high, the pressure difference before and after throttling is large, and the high-speed flowing fluid is easy to damage the valve sealing part and the throttling surface. In the throttling air release valve provided by the invention, the first throttling holes are uniformly distributed around the valve seat, the plurality of rows of second throttling holes are uniformly distributed at the bottom of the valve sleeve, and the third throttling holes are uniformly distributed around the throttling sleeve. The high-pressure medium flows through a first throttling hole at the bottom of the valve seat, and through the primary throttling effect of the throttling sleeve, the throttled medium performs secondary throttling through a third throttling hole on the throttling sleeve, then flows through the valve core and the valve seat sealing part, and reaches a second throttling hole on the valve sleeve to perform tertiary throttling. Through multistage throttling effect, satisfy the performance of valve under the high pressure operating mode, reduce high pressure fluid and wash away sealing part, prolong the life of valve.
Preferably, an oil injection passage is provided on the side surface of the valve body 1, one end of which communicates with the valve seat mounting groove 101, and the other end of which is provided with a check valve 18 and a grease injection valve 17 in order. In the prior art, the throttle emptying valve cannot be sealed in an emergency when the valve leaks because of the non-valve seat grease injection structure. According to the invention, the grease injection hole is arranged on the valve body, and the check valve and the grease injection valve are arranged, so that the valve can normally inject grease to carry out emergency sealing under the state of pressure.
The above embodiments are only for illustrating the present invention and not for limiting the technical solutions described in the present invention, and although the present invention has been described in detail in the present specification with reference to the above embodiments, the present invention is not limited to the above specific embodiments, and thus any modifications or equivalent substitutions are made to the present invention; all technical solutions and modifications thereof that do not depart from the spirit and scope of the invention are intended to be included in the scope of the appended claims.
Claims (9)
1. A spring type multistage throttling emptying valve is characterized in that: the blow-off valve includes: the valve comprises a valve body, a valve cover, an end cover, a valve rod, a valve seat, a valve sleeve, a valve core and a throttling sleeve; the valve cover and the end cover are respectively positioned at the upper end and the lower end of the valve body, the upper end of the valve cover is provided with a bracket, and the lower end of the valve rod sequentially passes through the bracket and the valve cover and is in transmission connection with the valve core; the upper end of the valve rod is provided with a threaded section, a hand wheel is arranged on the threaded section, and a valve rod nut matched with the threaded section at the upper end of the valve rod is arranged in the bracket; a sealing packing is further arranged between the valve rod and the valve cover, a packing pressing ring is arranged at the upper end of the sealing packing, a packing pressing cover is further arranged in the support, the lower side of the packing pressing cover is abutted against the packing pressing ring, and the upper side of the packing pressing cover is abutted against the support through a threaded fastener;
the valve seat, the throttling sleeve, the valve core and the valve sleeve are sequentially arranged in the valve body from bottom to top, wherein an installation boss is arranged at the upper end of the valve seat and is positioned in a valve seat installation groove arranged in the valve body, and a plurality of first throttling holes are formed in the peripheral surface of the valve seat; the lower end of the valve sleeve is abutted against the mounting boss of the valve seat, the other end of the valve sleeve is abutted against the valve cover, and a plurality of second orifices are staggered on the peripheral surface of the valve sleeve close to the lower side; the throttle sleeve is positioned in the valve seat, the lower end of the throttle sleeve is provided with a throttle sleeve sealing surface, the throttle sleeve sealing surface is in sliding fit with the inner peripheral surface of the valve seat so as to open or close the first throttle hole, the upper end of the throttle sleeve is provided with a first threaded part, the first threaded part is in transmission connection with the valve core, and the outer peripheral surface of the middle part of the throttle sleeve is provided with a third throttle hole; the valve comprises a valve core, a pressing ring and a valve rod, wherein a first cavity for inserting the valve rod is formed at the upper end of the valve core, a second threaded part matched with the pressing ring is arranged in the first cavity, and the valve rod is connected with the valve core through the pressing ring and a gasket after the valve rod is inserted into the first cavity; the outer peripheral surface of the valve core is in sliding fit with the inner peripheral surface of the valve sleeve so as to open or close the second throttling hole, a multi-stage sealing structure is arranged between the valve seat and the valve core, and the multi-stage sealing structure is used for closing a fluid channel flowing from the first throttling hole to the second throttling hole;
the multi-stage sealing structure includes: the valve seat comprises a valve seat, a valve core, a valve seat sealing ring and a valve seat sealing ring, wherein the valve core sealing ring is arranged at the lower end of the valve core; the valve seat is characterized in that the cross section of the spring seat is L-shaped, a plurality of springs are arranged between the long side of the L-shaped cross section and the valve core, a spring seat sealing part is arranged at the end part of the short side of the L-shaped cross section, the first sealing part and the second sealing part are adjacently arranged, and the height of the second sealing part is higher than that of the first sealing part in the axial direction of the valve seat; the first sealing part and the spring seat sealing part are matched with each other to form a first sealing structure, the second sealing part and the valve core sealing part are matched with each other to form a second sealing structure, the valve seat sealing ring and the valve core sealing part are matched with each other to form a third sealing structure, and the first sealing structure, the second sealing structure and the third sealing structure are sequentially arranged along the radial direction of the valve seat.
2. The vent valve of claim 1, wherein: the first sealing part, the second sealing part, the spring seat sealing part and the valve core sealing part are all hard alloy layers, so that the first sealing structure and the second sealing structure form a metal hard sealing structure, and the third sealing structure forms a composite sealing structure.
3. The vent valve of claim 2, wherein: the mounting boss of the valve seat is provided with an upper valve seat mounting surface and a lower valve seat mounting surface, wherein the valve seat sealing ring is positioned between the upper valve seat mounting surface and the valve core sealing part, the inner ring of the valve seat sealing ring is abutted against the valve seat, and the outer ring is abutted against the valve sleeve.
4. A blow-down valve according to claim 3, wherein: the valve seat lower mounting surface is positioned in the valve seat mounting groove, a valve seat sealing groove is formed in the outer side of the valve seat lower mounting surface, a second sealing ring is arranged in the valve seat sealing groove, and the second sealing ring is used for sealing between the valve seat and the valve body.
5. The vent valve of claim 4, wherein: the width of the contact surface of the valve seat sealing ring and the valve core sealing part is larger than that of the contact surface of the second sealing part and the valve core sealing part.
6. The vent valve of claim 5, wherein: and three layers of second orifices are alternately arranged on the peripheral surface of the valve sleeve close to the lower side.
7. The vent valve of claim 6, wherein: the lower end of the valve core is provided with a valve core boss, the end part of the valve core boss is provided with the valve core sealing part, the inner side of the valve core boss is provided with a plurality of spring mounting holes along the circumferential direction, one end of a spring is propped against the bottom of the spring mounting hole, and the other end of the spring is propped against the spring seat; the lower extreme of case is provided with the second cavity, the second cavity inboard is provided with the third screw thread portion of first screw thread portion complex.
8. The vent valve of claim 7, wherein: the valve core is characterized in that a plurality of pressure balance holes are formed in the axial direction of the valve core, the first cavity is communicated with the second cavity through the pressure balance holes, a balance valve seat is arranged in the first cavity and is positioned between the valve core and the valve rod, and a buffer hole is formed in the balance valve seat.
9. The vent valve of any one of claims 1-8, wherein: an oiling channel is formed in the side face of the valve body, one end of the oiling channel is communicated with the valve seat mounting groove, and a check valve and a grease injection valve are sequentially arranged at the other end of the oiling channel.
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| CN202311748693.8A CN117432813B (en) | 2023-12-19 | 2023-12-19 | Spring type multi-stage throttling emptying valve |
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| CN202311748693.8A CN117432813B (en) | 2023-12-19 | 2023-12-19 | Spring type multi-stage throttling emptying valve |
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| CN117432813B true CN117432813B (en) | 2024-03-15 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117905904B (en) * | 2024-03-19 | 2024-05-14 | 成都成高阀门股份有限公司 | High-temperature wear-resistant and scouring-resistant ball valve |
| CN117927688B (en) * | 2024-03-21 | 2024-05-24 | 成都乘风阀门有限责任公司 | High-pressure zero-leakage blow-off valve |
| CN117927689B (en) * | 2024-03-21 | 2024-05-24 | 成都乘风阀门有限责任公司 | High-pressure sealing structure for valve |
| CN118009097A (en) * | 2024-04-10 | 2024-05-10 | 蓝帕控制阀门(江苏)有限公司 | Multistage pressure reducing regulating valve |
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| CN117432813A (en) | 2024-01-23 |
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