CN112610708A - Double-seat type regulating valve and sealing structure and method thereof - Google Patents
Double-seat type regulating valve and sealing structure and method thereof Download PDFInfo
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- CN112610708A CN112610708A CN202011448525.3A CN202011448525A CN112610708A CN 112610708 A CN112610708 A CN 112610708A CN 202011448525 A CN202011448525 A CN 202011448525A CN 112610708 A CN112610708 A CN 112610708A
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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
- F16K1/44—Details of seats or valve members of double-seat 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
- 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
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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
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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
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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
- F16K25/00—Details relating to contact between valve members and seat
Abstract
The invention discloses a double-seat type regulating valve and a sealing structure and a sealing method thereof, wherein the sealing structure comprises a valve clack and a valve seat; the top of the second cylinder of the valve clack is coaxially provided with an annular valve clack groove, and the inner diameter of the valve clack groove is the same as the diameter of the cross section of the first cylinder; an elastic assembly, a first sealing element and an inner ring which are all annular are sequentially arranged in the valve clack groove from bottom to top; the upper part of the inner ring extends into the assembly cavity, and the inner ring can slide up and down along the first column body; the top of the valve seat near the valve clack is coaxially provided with an annular valve seat groove, the bottom of the valve seat groove is filled with a first sealing element, the first sealing element is provided with an outer ring which can slide up and down along the valve seat groove, and the bottom of the outer ring can completely seal the valve seat groove through the first sealing element; the outer ring is fixedly connected with the inner ring through a connecting arm, and the outer ring, the inner ring and the connecting arm form a closed assembly together. The invention can completely ensure the simultaneous sealing of two pairs of valve seats and valve clacks in the regulating valve, and has simple structure and lower manufacturing and replacing costs.
Description
Technical Field
The invention belongs to the field of valve sealing, and particularly relates to a double-seat type regulating valve and a sealing structure and method thereof.
Background
The regulating valve is used for regulating technological parameters such as medium flow, pressure, temperature and the like in the pipeline. Due to the double-seat structure, the working pressure difference of the valve can be ensured, the axial force borne by the valve rod can be reduced, the flow of a single valve seat in the valve can be reduced, and the stress of a valve core of the single valve rod can be reduced, so that the double-seat structure can be better suitable for the working condition with high parameter.
However, in the actual production process, the sealing between the two pairs of valve seats and the valve clack needs to be simultaneously met when the double-seat regulating valve is closed, which puts a very high requirement on the manufacturing precision of the valve rod and the valve clack; if the material of the valve seat portion is changed to an elastic sealing material in order to make both the valve seats and the valve flaps in close contact, the strength of the valve seats is reduced, and the valve seats are easily damaged and deformed, and the valve seats are not easily repaired and replaced, which greatly increases the cost.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a double-seat type regulating valve and a sealing structure and a sealing method thereof.
The invention adopts the following specific technical scheme:
the first purpose of the invention is to provide a sealing structure of a double-seat type regulating valve, which comprises a valve clack and a valve seat;
the valve clack comprises a first cylinder and a second cylinder, the first cylinder is attached to and coaxially fixed above the second cylinder, and the diameter of the cross section of the first cylinder is smaller than that of the cross section of the second cylinder; the top of the second cylinder is coaxially provided with an annular valve clack groove, and the inner diameter of the valve clack groove is the same as the diameter of the cross section of the first cylinder;
a gland is arranged on the top sealing cover of the valve clack, the periphery of the gland extends vertically downwards, and an annular assembly cavity is formed between the gland and the outer wall of the upper part of the first column body; an annular elastic assembly, a first sealing element and an inner ring are sequentially arranged in the valve clack groove from bottom to top; the upper part of the inner ring extends into the assembly cavity, the top of the assembly cavity is provided with a second sealing element and is always closed, and the bottom of the assembly cavity can completely close the valve clack groove through the first sealing element; the inner ring can slide up and down along the first column body;
the top of the valve seat near the valve clack is coaxially provided with an annular valve seat groove, the bottom of the valve seat groove is filled with a first sealing element, the first sealing element is provided with an outer ring which can slide up and down along the valve seat groove, and the bottom of the outer ring can completely seal the valve seat groove through the first sealing element;
the outer ring and the inner ring are fixedly connected through a connecting arm, and the outer ring, the inner ring and the connecting arm form a closed assembly together; the connecting arm can move downwards under the action of pressure difference and simultaneously drives the inner ring to slide downwards along the first column body, and the outer ring slides downwards in the valve seat groove, so that the valve clack and the valve seat are sealed.
Preferably, the outer diameter of the connecting arm is equal to the diameter of the largest cross-section of the other flap.
Preferably, the elastic component is a disc spring.
Preferably, the second seal is an O-ring.
Furthermore, a concave arc-shaped groove is formed in the top of the inner ring along the circumferential direction and used for placing an O-shaped ring.
Preferably, the first seal is a graphite ring.
Preferably, the top of the valve clack is provided with a gland through a fixing piece detachable sealing cover.
Preferably, the fixing member is a self-locking nut.
The second purpose of the invention is to provide a double-seat type regulating valve which particularly comprises a valve body, a valve core assembly positioned above the valve body and a valve clack assembly positioned below the valve body, wherein the valve core assembly and the valve clack assembly are respectively used for sealing an upper flow channel and a lower flow channel in the valve body; wherein the valve flap component adopts a sealing structure as claimed in any one of claims 1 to 8;
when the valve core assembly is connected in a closed mode, the connecting arm in the valve clack assembly can move downwards under the action of pressure difference, meanwhile, the inner ring is driven to slide downwards along the first column body, the outer ring slides downwards in the valve seat groove, and the valve clack and the valve seat in the valve clack assembly are closed.
A third object of the present invention is to provide a sealing method of the dual seat type regulating valve according to the second object, which comprises the following steps:
s1: when the valve is opened, the actuating mechanism drives the valve core in the valve core assembly to move upwards through the valve rod, and meanwhile, the valve clack, the valve cover and the sealing assembly in the valve clack assembly move upwards together; the medium enters the outlet flow channel through the opened valve seat port to realize medium circulation;
s2: when the valve is closed, the actuating mechanism drives the valve core in the valve core assembly to move downwards through the valve rod, and meanwhile, the valve clack, the valve cover and the sealing assembly in the valve clack assembly move downwards together; the distance between the valve clack and the valve seat is gradually reduced, the flow rate of the medium between the valve clack and the valve seat is continuously accelerated, and the pressure is reduced;
when the valve core assembly is closed, the valve rod stops moving, meanwhile, a connecting arm in the valve clack assembly moves downwards under the action of pressure difference of an upper medium and a lower medium, the inner ring slides downwards along the first column body and completely seals the valve clack groove through the first sealing element, the outer ring slides downwards in the valve seat groove and completely seals the valve seat groove through the first sealing element, and therefore the space between the valve clack and the valve seat is sealed.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a novel sealing structure of a valve clack and a valve seat, which can ensure that an upper valve clack and a lower valve clack are simultaneously and tightly contacted with the upper valve seat and the lower valve seat when a double-seat type regulating valve is closed, and avoid leakage caused by gaps. The invention adopts the self-sealing principle, achieves the sealing effect by utilizing the medium pressure in the regulating valve, and can ensure the complete sealing between the two pairs of valve seats and the valve clacks in the regulating valve by the structure and the method. In addition, the double-seat type regulating valve is relatively simple in structure, low in manufacturing and replacing difficulty and low in cost, and is suitable for design, manufacturing and improvement of various double-seat type regulating valves.
Drawings
FIG. 1 is a schematic overall view of the present invention in a regulator valve;
FIG. 2 is a schematic view of the entire sealing member of the present invention;
the reference numbers in the figures are: the valve comprises a valve clack 1, a valve clack groove 1-1, a valve seat 2, a valve seat groove 2-1, a gland 3, a sealing component 4, an inner ring 4-1, a connecting arm 4-2, an outer ring 4-3, a fixing component 5, a second sealing component 6, a first sealing component 7 and an elastic component 8.
Detailed Description
The invention will be further elucidated and described with reference to the drawings and the detailed description. The technical features of the embodiments of the present invention can be combined correspondingly without mutual conflict.
As shown in fig. 2, the sealing structure of the double seat type regulating valve provided by the invention comprises a valve flap 1 and a valve seat 2.
Valve clack 1 includes first cylinder and second cylinder, and first cylinder and the coaxial laying of second cylinder, and the laminating of first cylinder is fixed in the top of second cylinder, and the diameter of first cylinder cross section is less than the diameter of second cylinder cross section, and first cylinder and second cylinder constitute the structure of similar "protruding" style of calligraphy jointly promptly. The top of the second cylinder is provided with an annular valve clack groove 1-1, the valve clack groove 1-1 and the second cylinder are coaxially arranged, and the inner diameter of the valve clack groove 1-1 is the same as the diameter of the cross section of the first cylinder, so that the inner wall of the valve clack groove 1-1 is straightly connected with the outer wall of the first cylinder to form a columnar sliding surface together.
The top of the valve clack 1 is sealed and provided with a gland 3, the main body of the gland 3 is of a disc-shaped structure, the outer circumference of the gland extends vertically downwards, and an annular assembly cavity is formed between the gland and the outer wall of the upper part of the first column body. In this embodiment, the size of the assembly chamber is exactly the same as the size of the valve flap slot 1-1, and the position of the assembly chamber is exactly vertically spaced from and corresponds to the position of the valve flap slot 1-1.
An elastic component 8, a first sealing element 7 and an inner ring 4-1 are sequentially arranged in the valve clack groove 1-1 from bottom to top, and the elastic component 8, the first sealing element 7 and the inner ring 4-1 are all annular. The inner ring 4-1 is of a cylindrical structure, the upper portion of the inner ring extends into the assembly cavity, the second sealing element 6 is arranged at the top of the inner ring 4-1, the inner ring 4-1 can seal the top of the assembly cavity all the time under the action of the second sealing element 6, and the sealing effect of the joint of the inner ring 4-1, the first cylinder and the gland 3 is guaranteed. The bottom of the inner ring 4-1 can completely close the valve flap groove 1-1 by means of the first seal 7, so that the medium cannot leak through the gap between the valve flap groove 1-1 and the inner ring 4-1. The inner ring 4-1 is in clearance fit with the side column surface of the first column body and can slide up and down along the side column surface of the first column body.
The top of the valve seat 2 near the valve clack 1 is provided with an annular valve seat groove 2-1, and the valve seat groove 2-1 and the valve seat 2 are coaxially arranged. The bottom of the valve seat groove 2-1 is filled with a first sealing element 7, the top of the first sealing element 7 is provided with an outer ring 4-3 capable of sliding up and down along the valve seat groove 2-1, and the bottom of the outer ring 4-3 can completely seal the valve seat groove 2-1 through the first sealing element 7, so that a medium cannot leak through a gap between the outer ring 4-3 and the valve seat groove 2-1.
The outer ring 4-3 and the inner ring 4-1 are fixedly connected through a connecting arm 4-2, and the outer ring 4-3, the inner ring 4-1 and the connecting arm 4-2 together form a closed assembly 4. When the valve is closed, the connecting arm 4-2 can move downwards under the action of pressure difference, and simultaneously drives the inner ring 4-1 to slide downwards along the first column body, and the outer ring 4-3 slides downwards in the valve seat groove 2-1, so that the space between the valve clack 1 and the valve seat 2 is sealed.
In this embodiment the outer diameter of the connecting arm 4-2 can be set equal to the diameter of the largest cross-section of the other flap, so that the axial forces to which the valve stem is subjected can be counteracted. The elastic member 8 may be a disc spring. The second sealing element 6 can adopt an O-shaped ring, and in actual use, in order to further ensure the sealing effect of the joint of the inner ring 4-1, the first column and the gland 3, a concave arc-shaped groove can be formed in the top of the inner ring 4-1 along the circumferential direction and used for placing the O-shaped ring. The first seal 7 may be a graphite ring.
In practical application, in order to facilitate assembly, a gland 3 can be arranged on the top of the valve clack 1 through a fixing part 5 detachable sealing cover, and the fixing part 5 can adopt a self-locking nut. Therefore, when the sealing structure is assembled, the disc spring 8 and the graphite ring 7 are sequentially arranged at the bottom of the valve clack groove 1-1, the inner ring 4-1 is arranged in the valve clack groove 1-1, the O-shaped ring 6 is placed in a groove at the top of the inner ring 4-1, the gland 3 is finally covered, and the self-locking nut 5 is screwed on for fixing, so that the assembly of the sealing structure is realized. By adopting the detachable sealing structure, the replacement and maintenance of each component can be facilitated, and the cost can be effectively saved in the practical application.
As shown in fig. 1, the invention further provides a double-seat type regulating valve using the sealing structure, the double-seat type regulating valve comprises a valve body, a valve core assembly located above the valve body, and a valve clack assembly located below the valve core assembly, and the valve core assembly and the valve clack assembly are respectively used for closing an upper flow passage and a lower flow passage in the valve body. Wherein, the valve clack component positioned at the lower part adopts the sealing structure.
Because certain errors exist in the machining process, the valve core assembly positioned above and the valve clack assembly positioned below cannot simultaneously meet the completely closed state. Therefore, through the sealing structure provided by the invention, when the valve core assembly is connected in a sealing way, the valve clack assembly is basically in a sealing state, at the moment, the connecting arm 4-2 in the valve clack assembly can move downwards under the action of pressure difference, and simultaneously, the inner ring 4-1 is driven to slide downwards along the first column body, and the outer ring 4-3 slides downwards in the valve seat groove 2-1, so that the valve clack 1 and the valve seat 2 in the valve clack assembly are further sealed.
The sealing method by utilizing the double-seat type regulating valve comprises the following specific steps:
s1: in the initial stage, when the valve is opened, the actuating mechanism of the regulating valve drives the valve core in the valve core assembly to move upwards through the valve rod, and meanwhile, the valve clack 1, the valve cover 3 and the sealing assembly 4 in the valve clack assembly move upwards together. Valve seat openings in the valve core assembly and the valve clack assembly are both in an opening state, and media enter the outlet flow channel through the opened valve seat openings, so that the circulation of the media is realized.
S2: when the valve is closed, the actuating mechanism of the regulating valve drives the valve core in the valve core assembly to move downwards through the valve rod, and meanwhile, the valve clack 1, the valve cover 3 and the sealing assembly 4 in the valve clack assembly move downwards together. The distance between the valve clack 1 and the valve seat 2 is gradually reduced, the medium flow speed between the valve clack and the valve seat is continuously accelerated, and the pressure is reduced.
When the valve core assembly is in the closed state, the valve rod stops moving, and at the moment, the valve clack assembly is also in the closed state basically. Meanwhile, the connecting arm 4-2 in the valve clack assembly moves downwards under the action of the pressure difference between the upper medium and the lower medium, the inner ring 4-1 slides downwards along the first column body and completely seals the valve clack groove 1-1 through the first sealing piece 7, and the outer ring 4-3 slides downwards in the valve seat groove 2-1 and completely seals the valve seat groove 2-1 through the first sealing piece 7, so that the valve clack 1 and the valve seat 2 in the valve clack assembly are further sealed.
The double-seat regulating valve can ensure that the valve clack assembly and the valve core assembly are kept in a closed state when being closed, and avoids medium leakage caused by the fact that a gap is formed due to insufficient machining precision. The invention has simple structure and lower manufacturing and replacing cost.
The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, the technical scheme obtained by adopting the mode of equivalent replacement or equivalent transformation is within the protection scope of the invention.
Claims (10)
1. A sealing structure of a double-seat type regulating valve is characterized by comprising a valve clack (1) and a valve seat (2);
the valve clack (1) comprises a first cylinder and a second cylinder, the first cylinder is attached to and coaxially fixed above the second cylinder, and the diameter of the cross section of the first cylinder is smaller than that of the cross section of the second cylinder; the top of the second cylinder is coaxially provided with an annular valve clack groove (1-1), and the inner diameter of the valve clack groove (1-1) is the same as the diameter of the cross section of the first cylinder;
a gland (3) is arranged on a top sealing cover of the valve clack (1), the periphery of the gland (3) vertically extends downwards, and an annular assembly cavity is formed between the gland and the outer wall of the upper part of the first column body; an annular elastic component (8), a first sealing element (7) and an inner ring (4-1) are sequentially arranged in the valve clack groove (1-1) from bottom to top; the upper part of the inner ring (4-1) extends into the assembly cavity, the top of the inner ring is provided with a second sealing element (6) and seals the top of the assembly cavity all the time, and the bottom of the inner ring can completely seal the valve clack groove (1-1) through a first sealing element (7); the inner ring (4-1) can slide up and down along the first column body;
the top of the valve seat (2) near the valve clack (1) is coaxially provided with an annular valve seat groove (2-1), the bottom of the valve seat groove (2-1) is filled with a first sealing element (7), the first sealing element (7) is provided with an outer ring (4-3) capable of sliding up and down along the valve seat groove (2-1), and the bottom of the outer ring (4-3) can completely seal the valve seat groove (2-1) through the first sealing element (7);
the outer ring (4-3) is fixedly connected with the inner ring (4-1) through a connecting arm (4-2), and the outer ring (4-3), the inner ring (4-1) and the connecting arm (4-2) jointly form a closed assembly (4); the connecting arm (4-2) can move downwards under the action of pressure difference and simultaneously drives the inner ring (4-1) to slide downwards along the first column body, and the outer ring (4-3) slides downwards in the valve seat groove (2-1) so as to seal the space between the valve clack (1) and the valve seat (2).
2. A sealing arrangement according to claim 1, characterised in that the outer diameter of the connecting arm (4-2) is equal to the diameter of the largest cross-section of the other flap.
3. The sealing structure according to claim 1, characterized in that the elastic member (8) is a disc spring.
4. The sealing structure according to claim 1, characterized in that the second seal (6) is an O-ring.
5. The sealing structure according to claim 4, characterized in that the top of the inner ring (4-1) is provided with a concave arc groove along the circumferential direction for placing an O-ring.
6. The sealing structure according to claim 1, characterized in that the first seal (7) is a graphite ring.
7. Sealing structure according to claim 1, characterized in that the top of the flap (1) is provided with a gland (3) by means of a fixed part (5) detachably sealing the cover.
8. The sealing structure according to claim 7, characterized in that the fixture (5) is a self-locking nut.
9. A double-seat type regulating valve is characterized by comprising a valve body, a valve core assembly positioned above the valve body and a valve clack assembly positioned below the valve core assembly, wherein the valve core assembly and the valve clack assembly are respectively used for sealing an upper flow channel and a lower flow channel in the valve body; wherein the valve flap component adopts a sealing structure as claimed in any one of claims 1 to 8;
when the valve core assembly is connected in a closed mode, the connecting arm (4-2) in the valve clack assembly can move downwards under the action of pressure difference, the inner ring (4-1) is driven to slide downwards along the first column body, the outer ring (4-3) slides downwards in the valve seat groove (2-1), and the valve clack (1) and the valve seat (2) in the valve clack assembly are closed.
10. A method of sealing a dual seat regulator valve according to claim 9, comprising the steps of:
s1: when the valve is opened, the actuating mechanism drives the valve core in the valve core assembly to move upwards through the valve rod, and meanwhile, the valve clack (1), the valve cover (3) and the sealing assembly (4) in the valve clack assembly move upwards together; the medium enters the outlet flow channel through the opened valve seat port to realize medium circulation;
s2: when the valve is closed, the actuating mechanism drives the valve core in the valve core assembly to move downwards through the valve rod, and meanwhile, the valve clack (1), the valve cover (3) and the sealing assembly (4) in the valve clack assembly move downwards together; the distance between the valve clack (1) and the valve seat (2) is gradually reduced, the flow rate of a medium between the valve clack and the valve seat is continuously accelerated, and the pressure is reduced;
when the valve core assembly is closed, the valve rod stops moving, meanwhile, a connecting arm (4-2) in the valve clack assembly moves downwards under the action of the pressure difference of an upper medium and a lower medium, an inner ring (4-1) slides downwards along the first column and completely closes a valve clack groove (1-1) through a first sealing piece (7), and an outer ring (4-3) slides downwards in the valve seat groove (2-1) and completely closes the valve seat groove (2-1) through the first sealing piece (7), so that the space between the valve clack (1) and the valve seat (2) is closed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011448525.3A CN112610708B (en) | 2020-12-09 | 2020-12-09 | Double-seat type regulating valve and sealing structure and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011448525.3A CN112610708B (en) | 2020-12-09 | 2020-12-09 | Double-seat type regulating valve and sealing structure and method thereof |
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| CN112610708A true CN112610708A (en) | 2021-04-06 |
| CN112610708B CN112610708B (en) | 2021-11-02 |
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