CN217784373U - Integrated double-seat regulating valve core - Google Patents

Abstract

The utility model provides an integral type double-seat governing valve case relates to double-seat governing valve technical field for double-seat governing valve, double-seat governing valve includes the valve body, go up the valve seat, lower disk seat, case and valve rod, it installs in the upper portion of valve body to go up the valve seat, lower disk seat is installed in the lower part of valve body, the inside of valve body is located to the case, the valve rod rigid coupling is in the top of case, a motion about being used for driving the valve core, the case is the cylinder structure, the lower part cooperatees with lower disk seat, upper portion and last valve seat cooperate, so that the case carries out the up-and-down motion along lower disk seat and last valve seat. The utility model discloses an improve the bulk strength of case, increase direction area can effectively improve the direction performance, and processing is simple, can effectively prevent the destruction of the unbalanced effort of medium to the valve, improves the complete machine performance and the life of two governing valves by a wide margin, makes the control system operation more stable.

Description

Integrated double-seat regulating valve core

Technical Field

The utility model relates to a two-seat governing valve technical field, in particular to integral type two-seat governing valve case.

Background

The existing double-seat regulating valve core is formed by welding an upper valve core, a lower valve core and a rod in an assembling way and then performing finish machining, and a valve rod is connected with the valve core through threads. The valve core is guided by the upper rod part and the lower rod part, has small guide area and poor guide performance, and is easily damaged by the scouring of media. The valve core does not have the function of preventing rotation, medium acting force is usually unbalanced, and the unbalanced acting force can cause the valve core to rotate in the adjusting valve, so that the valve is damaged. Because the valve core belongs to a long shaft part, the middle strength of the valve core is very low, the valve cores with different calibers have the phenomenon of cutter vibration in different degrees during processing, the dimensional tolerance, the form and position tolerance and the roughness can not be ensured, and the overall performance and the service life of the regulating valve are influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an integral type double-seat governing valve case, this integral type double-seat governing valve case can increase the bulk strength of product, increases the guide area, and the direction performance is good, and the direction is longe-lived. Simple structure, processing convenience can avoid adding the sword phenomenon of shaking that exists man-hour, guarantee the dimensional tolerance of product, geometric tolerances.

For realizing the purpose of the utility model, the utility model adopts the following technical proposal:

according to the utility model discloses an aspect provides an integral type double seat governing valve case for the double seat governing valve, the double seat governing valve includes the valve body, goes up the disk seat, lower disk seat, case and valve rod, lower disk seat install in the lower part of valve body, go up the disk seat install in the upper portion of valve body, the case is located the inside of valve body, the valve rod rigid coupling in the top of case is used for the drive the case up-and-down motion, the case is the cylinder structure, upper portion with go up the disk seat and cooperate, the lower part with the disk seat cooperatees down, so that the case is followed the disk seat down with go up the disk seat and carry out the up-and-down motion.

According to an embodiment of the present invention, the valve element includes a valve element housing, a partition, a first orifice group and a second orifice group, the valve element housing is provided with a cavity inside, the cavity is used for conveying media, the partition is fixedly connected to the valve element housing and divides the valve element housing into two cavities, wherein the cavity above the partition is an upper cavity, the cavity below the partition is a lower cavity, the lower cavity is matched with the lower valve seat, the upper cavity is matched with the upper valve seat, the first orifice group is disposed at the upper portion of the valve element housing and communicated with the upper cavity to regulate and control the flow rate flowing through the lower valve seat; the second throttling hole group is arranged at the lower part of the valve core shell and is communicated with the lower cavity so as to regulate and control the flow passing through the upper valve seat.

According to an embodiment of the present invention, the periphery of the valve core housing is further provided with a first sealing surface and a second sealing surface, the first sealing surface is located at the periphery of the top of the valve core housing and corresponds to the upper valve seat, and is used for improving the sealing property between the valve core housing and the upper valve seat; the second sealing surface is located on the periphery of the middle of the valve core shell and corresponds to the lower valve seat, and is used for improving the sealing performance between the valve core shell and the lower valve seat.

According to the utility model discloses an embodiment, wherein, first orifice group with second orifice group is a plurality ofly, first orifice group with the quantity of second orifice group is the same.

According to the utility model discloses an embodiment, wherein, first orifice group includes a plurality of first orifices, and is a plurality of first orifices is located go up the same outer anchor ring of cavity, second orifice group is a plurality of second orifices, and is a plurality of the second orifices is located down the same outer anchor ring of cavity, the aperture of first orifice with the aperture of second orifice is the same.

According to the utility model discloses an embodiment, wherein, a plurality of first orifices in the first orifice group with a plurality of second orifices one-to-one in the second orifice group, correspond in the position the center of first orifice with the distance of the bottom of first sealed face the center of second orifice with the distance of the bottom of the sealed face of second equals.

According to the utility model discloses an embodiment, wherein, the through-flow hole has still been seted up to the case casing, the through-flow hole communicate in go up the cavity, in order to increase the circulation ability of case.

According to the utility model discloses an embodiment, wherein, the through-flow hole is a plurality of, and is a plurality of the area sum of through-flow hole is not less than 1.2 times of lower disk seat internal diameter area.

According to the utility model discloses an embodiment, wherein, the axle sleeve is installed on valve body upper portion, the axle sleeve cover is located the periphery of valve rod, the axle sleeve with be provided with between the valve rod and prevent changeing the structure, make the valve rod carries out the up-and-down motion.

According to the utility model discloses an embodiment, wherein, rotation-proof structure includes guide key and guide way, wherein, the guide key install in the medial surface of axle sleeve, the guide way install in the lower part of valve rod, and corresponding to the guide key is used for the restriction the guide key carries out the up-and-down motion.

The utility model provides an embodiment has following advantage or beneficial effect:

the utility model can effectively improve the guiding performance and the guiding service life by improving the integral strength of the valve core and increasing the guiding area, has simple processing, effectively eliminates the cutter vibration phenomenon existing in the processing and simultaneously ensures the dimensional tolerance, the form and position tolerance and the roughness; the anti-rotation structure can effectively prevent the unbalanced acting force of the medium from damaging the valve, greatly improve the overall performance and the service life of the double-seat regulating valve and ensure that the control system operates more stably.

Drawings

The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

FIG. 1 is a schematic illustration of an installation of an integrated two-seat regulator valve cartridge and two-seat regulator valve, according to an exemplary embodiment.

FIG. 2 is an enlarged schematic view at A of FIG. 1, shown in accordance with an exemplary embodiment.

FIG. 3 is a schematic diagram illustrating the connection of a valve cartridge and a valve stem according to an exemplary embodiment.

Wherein the reference numerals are as follows:

1. a valve body; 10. a valve cavity; 11. a first flow passage; 12. a second flow passage; 2. an upper valve seat; 3. a lower valve seat; 4. a valve core; 41. a valve core housing; 411. a first sealing surface; 412. a second sealing surface; 42. a partition plate; 43. a first orifice group; 431. a first orifice; 44. a second orifice group; 441. a second orifice; 45. a through-flow aperture; 5. a valve stem; 6. a shaft sleeve; 7. an anti-rotation structure; 71. a guide key; 72. a guide groove.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

The terms "a", "an", "the", "said" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.

As shown in fig. 1 to 3, fig. 1 shows an installation schematic diagram of an integrated double-seat regulating valve spool and a double-seat regulating valve provided by the present invention. Fig. 2 shows an enlarged schematic view of a in fig. 1 provided by the present invention. Fig. 3 shows a schematic connection diagram of the valve element 4 and the valve rod 5 provided by the present invention.

The utility model discloses an integral type double-seat governing valve case, be used for the double-seat governing valve, this double-seat governing valve includes valve body 1, go up disk seat 2, lower disk seat 3, case 4 and valve rod 5, lower disk seat 3 is installed in the lower part of valve body 1, go up disk seat 2 and install in the upper portion of valve body 1, the inside of valve body 1 is located to case 4, 5 rigid couplings of valve rod in the top of case 4, be used for driving 4 up-and-down motion of valve core, case 4 is the cylinder structure, upper portion and last disk seat 2 cooperate, the lower part cooperatees with disk seat 3 down, so that case 4 carries out the up-and-down motion along disk seat 3 down and last disk seat 2.

The valve body 1 includes a valve cavity 10, a first flow channel 11 and a second flow channel 12, the valve cavity 10 is communicated with the first flow channel 11 and the second flow channel 12, so that a medium in the valve body 1 flows between the first flow channel 11 and the second flow channel 12 through the valve cavity 10, the medium can enter the valve cavity 10 through the valve core 4 from the first flow channel 11 and finally enter the second flow channel 12, and the medium can also enter the valve cavity 10 from the second flow channel 12 and finally flow out from the first flow channel 11. A first opening and a second opening are arranged between the first flow channel 11 and the valve cavity 10, wherein the upper valve seat 2 is installed at the first opening, the lower valve seat 3 is installed at the second opening, the valve core 4 is positioned in the valve cavity 10, the upper part of the valve core 4 is matched with the upper valve seat 2, the lower part of the valve core 4 is matched with the lower valve seat 3, the upper end of the valve rod 5 is connected with an actuating mechanism, and the lower part of the valve rod 5 is fixedly connected with the valve core 4 and drives the valve core 4 to move up and down so as to control the flow rate flowing through the lower valve seat 3 and the upper valve seat 2.

When the double-seat regulating valve is closed, the valve core 4 is driven by the valve rod 5 to move downwards, so that the valve core 4 is tightly combined with the lower valve seat 3 and the upper valve seat 2 at the same time to realize closing; when the double-seat regulating valve is opened, the valve rod 5 drives the valve core 4 to move upwards, and when the valve core 4 moves to the maximum stroke position, the valve core 4 is matched with the upper valve seat 2, the valve core 4 and the lower valve seat 3, namely the valve core 4 is matched with the upper valve seat 2 and the lower valve seat 3 all the time in the up-and-down movement process. In this embodiment, the valve core 4 and the valve rod 5 are integrally formed, and the structure greatly increases the overall strength of the valve core 4 and the valve rod 5. In addition, triple guiding is available in the example, the first double guiding is guiding of the valve core 4 driven by the valve rod 5 to move up and down, the second double guiding is the lower part of the valve core 4 and the lower valve seat 3, and the third double guiding is the upper part of the valve core 4 and the upper valve seat 2, because the valve core 4 is matched with the upper valve seat 2 and the lower valve seat 3 all the time in the up-and-down movement process, therefore, the upper valve seat 2 and the lower valve seat 3 can limit the valve core 4 to move up and down all the time. In addition, the valve core 4 is of a cylindrical structure, compared with the prior art, the valve core 4 of the embodiment is simpler to process, the phenomenon of cutter vibration during processing can be avoided, and the dimensional tolerance, the form and position tolerance and the roughness of the valve core 4 are ensured.

In a preferred embodiment of the present invention, the valve core 4 includes a valve core housing 41, a partition plate 42, a first throttling hole group 43 and a second throttling hole group 44, a cavity is disposed inside the valve core housing 41, wherein the cavity is used for conveying a medium, the partition plate 42 is fixedly connected to the inside of the valve core housing 41, and divides the valve core housing 41 into two cavities, the cavity located above the partition plate 42 is an upper cavity, the cavity located below the partition plate 42 is a lower cavity, the lower cavity is matched with the lower valve seat 3, the upper cavity is matched with the upper valve seat 2, the first throttling hole group 43 is disposed on the upper portion of the valve core housing 41 and is communicated with the upper cavity to regulate and control the flow rate flowing through the lower valve seat 3; the second orifice set 44 is disposed at the lower portion of the valve core housing 41 and is communicated with the lower cavity to regulate the flow rate flowing through the upper valve seat 2.

The periphery of the valve core shell 41 is further provided with a first sealing surface 411 and a second sealing surface 412, the first sealing surface 411 is located on the periphery of the top of the valve core shell 41 and corresponds to the upper valve seat 2, and the first sealing surface 411 is used for improving the sealing performance between the valve core shell 41 and the upper valve seat 2; the second sealing surface 412 is located at the periphery of the middle portion of the spool housing 41 and corresponds to the lower valve seat 3, and is used for improving the sealing performance between the spool housing 41 and the lower valve seat 3.

As shown in fig. 1 and 3, the valve core 4 is divided into an upper cavity and a lower cavity by the partition plate 42, wherein the upper cavity is provided with a first throttling hole group 43, the lower cavity is provided with a second throttling hole group 44, and the valve core 4 is matched with the lower valve seat 3 and the upper valve seat 2, so that the flow control and the closing of the double-seat regulating valve can be realized. Since the medium can enter the second flow channel 12 from the first flow channel 11 after passing through the cavity, or can enter the first flow channel 11 from the second flow channel 12 after entering the cavity, for convenience of understanding and description, the present embodiment is described in a direction in which the first flow channel 11 enters the second flow channel 12. The method comprises the following specific steps:

when the valve of the double-seat regulating valve is closed, the valve rod 5 drives the valve core 4 to move downwards, so that the first sealing surface 411 on the valve core 4 is in tight contact with the upper valve seat 2, and the second sealing surface 412 is in tight contact with the lower valve seat 3, so that the sealing performance of the double-seat regulating valve is improved. At this time, the first orifice groups 43 are all located below the contact position of the first sealing surface 411 and the upper valve seat 2, the second orifice groups 44 are all located below the contact position of the second sealing surface 412 and the lower valve seat 3, the medium in the first flow channel 11 cannot enter the lower cavity from the second orifice group 44, and although the medium can enter the upper cavity from the through-hole 45, the upper cavity located above the contact position of the first sealing surface 411 and the upper valve seat 2 does not enter the first orifice group 43 of the cavity 10, so the medium in the upper cavity cannot enter the valve cavity 10, and therefore the medium at this time cannot enter the valve cavity 10 and the second flow channel 12 through the first orifice group 43 and the second orifice group 44.

With the valve of the double-seat regulating valve being opened, the valve core 4 starts to move upwards, and at this time, the first sealing surface 411 and part of the first throttling hole group 43 both move to above the upper valve seat 2, the second sealing surface 412 and part of the second throttling hole group 44 both move to above the lower valve seat 3, so that the medium can enter the upper cavity from the first throttling hole group 43 located below the upper valve seat 2 and enter the valve cavity 10 from the first throttling hole group 43 located partly above the upper valve seat 2, and part of the second throttling hole group 44 moves to above the lower valve seat 3, so that the medium can enter the lower cavity from the first throttling hole group 43, then flow out to the valve cavity 10 from the second throttling hole group 44 located below the lower valve seat 3, and finally flow out to the second flow passage 12. With the continuous upward movement of the valve core 4, the flow rate entering the valve cavity 10 continuously increases, and when the valve core 4 is at the highest point of the stroke, i.e. when the two-seat regulating valve is fully opened, the medium can simultaneously enter the valve cavity 10 and the second flow channel 12 from the first throttling hole group 43 and the second throttling hole group 44, and the flow rate passing through the valve cavity 10 is the maximum at this time.

In the present embodiment, the valve element 4 is used as a medium transfer passage through the partition plate 42, the first orifice group 43, and the second orifice group 44, and the valve element 4 is engaged with the lower valve seat 3 and the upper valve seat 2, whereby the flow rate of the medium can be effectively controlled, and the double-seat regulator valve can be closed.

In a preferred embodiment of the present invention, the first orifice group 43 and the second orifice group 44 are plural, and the number of the first orifice group 43 and the second orifice group 44 is the same. The first orifice group 43 includes a plurality of first orifices 431, the plurality of first orifices 431 are located on the same outer circumferential surface of the upper chamber, the second orifice group 44 is a plurality of second orifices 441, the plurality of second orifices 441 are located on the same outer circumferential surface of the lower chamber, and the diameters of the first orifices 431 and the second orifices 441 are the same.

The plurality of first orifices 431 in the first orifice group 43 and the plurality of second orifices 441 in the second orifice group 44 correspond one-to-one, and the distance between the center of the first orifices 431 and the bottom of the first sealing surface 411 and the distance between the center of the second orifices 441 and the bottom of the second sealing surface 412 at the corresponding positions are equal.

As shown in fig. 3, the first restriction hole groups 43 and the second restriction hole groups 44 are equal in number. The first throttle holes 431 in the first throttle hole group 43 and the second throttle holes 441 in the second throttle hole group 44 are the same in size and are in one-to-one correspondence in position, and the centers of the first throttle holes 431 and the second throttle holes 441 in the corresponding positions are respectively equal to the distances between the bottoms of the first sealing surface 411 and the second sealing surface 412 which are correspondingly arranged above the first throttle holes 431 and the second throttle holes 441.

In a preferred embodiment of the present invention, the valve core housing 41 is further opened with a through hole 45, and the through hole 45 is communicated with the upper cavity to increase the flow capacity of the valve core 4. The number of the through holes 45 is plural, and the sum of the areas of the plural through holes 45 is not less than 1.2 times the inner diameter area of the lower valve seat 3.

As shown in fig. 3, the through-flow hole 45 is formed in the valve core housing 41 on the upper cavity side, so that the upper cavity always keeps a large flow, the flow characteristic and the flow capacity designed according to the requirement of the working condition selection are met, and when the total area of the through-flow hole 45 is not smaller than 1.2 times of the inner diameter area of the lower valve seat 3, the flow capacity of the device is the best, the flow more meets the requirement, the shape of the through-flow hole 45 in the embodiment can be rectangular, circular, oval, triangular, hexagonal, octagonal and other structures, the embodiment does not limit the shape here, as long as the aperture of the through-flow hole 45 is larger than the orifice, the through-flow holes 45 are uniformly distributed in the periphery of the valve core housing 41, and the total area of the through-flow hole is not smaller than 1.2 times of the inner diameter area of the lower valve seat 3, so that the valve core 4 can meet the designed flow and flow demand, the structural design of the embodiment is ingenious, and the flow effect is good.

In a preferred embodiment of the present invention, the shaft sleeve 6 is installed on the upper portion of the valve body 1, the shaft sleeve 6 is sleeved on the periphery of the valve rod 5, and the rotation-preventing structure 7 is provided between the shaft sleeve 6 and the valve rod 5, so that the valve rod 5 can move up and down.

The rotation preventing structure 7 includes a guide key 71 and a guide groove 72, wherein the guide key 71 is installed on the inner side surface of the shaft sleeve 6, and the guide groove 72 is installed on the lower portion of the valve rod 5 and corresponds to the guide key 71 for limiting the guide key 71 from moving up and down.

As shown in fig. 2, the rotation-preventing structure 7 is arranged between the shaft sleeve 6 and the valve rod 5, and the guide key 71 and the guide groove 72 are matched, so that the valve core 4 can only move up and down in the valve body 1, the phenomenon that the valve core 4 rotates in the valve body 1 due to unbalanced acting force of a medium is effectively prevented, damage to the valve due to rotation of the valve core 4 is avoided, the overall performance and the service life of the double-seat regulating valve are improved, and the control system is more stable in operation.

The specific implementation principle is as follows:

when the double-seat regulating valve is closed, the valve rod 5 drives the valve core 4 to move downwards, so that the first sealing surface 411 on the valve core 4 is tightly combined with the upper valve seat 2, and the second sealing surface 412 is tightly combined with the lower valve seat 3, and sealing is realized. At this time, the first orifice group 43 is located below the contact position of the first sealing surface 411 and the upper valve seat 2, the second orifice group 44 is located below the contact position of the second sealing surface 412 and the lower valve seat 3, the medium in the first flow channel 11 cannot enter the lower cavity from the second orifice group 44, and although the medium can enter the upper cavity from the through-hole 45, the upper cavity above the contact position of the first sealing surface 411 and the upper valve seat 2 does not enter the first orifice group 43 of the valve chamber 10, that is, the medium cannot enter the valve chamber 10 and the second flow channel 12 through the first orifice group 43 and the second orifice group 44. Similarly, after the medium enters the valve chamber 10 from the second flow channel 12, the medium cannot enter the upper chamber, although the medium can enter the lower chamber, the second throttling hole set 44 is located below the contact position of the lower valve seat 3 and the second sealing surface 44, and the medium cannot enter the first flow channel 11 from the valve chamber 10, that is, the first flow channel 11 and the second flow channel 12 are not communicated.

When the double seat regulating valve is opened, the valve core 4 starts to move upwards, and at this time, the first sealing surface 411 and the first throttling hole group 43 both move to the upper part of the upper valve seat 2, the second sealing surface 412 and part of the second throttling hole group 44 are both positioned above the lower valve seat 3, so that the medium can enter the upper cavity from the through hole 45 positioned below the upper valve seat 2 and enter the valve cavity 10 from the first throttling hole group 43 partially positioned above the upper valve seat 2, and part of the second throttling hole group 44 moves to the upper part of the lower valve seat 3, so that the medium can enter the lower cavity from the lower cavity, then flow out to the valve cavity 10 from the second throttling hole group 44 positioned below the lower valve seat 3, and finally flow out to the second flow passage 12. With the continuous upward movement of the valve core 4, the flow rate entering the valve cavity 10 is continuously increased, when the valve core 4 is at the highest point of the stroke, i.e. when the double-seat regulating valve is fully opened, the medium can simultaneously enter the valve cavity 10 and the second flow passage 12 from the first throttling hole group 43 and the second throttling hole group 44, and the flow rate passing through the valve core 4 is maximum at this time. Similarly, when the medium enters the valve chamber 10 from the second flow passage 12, the medium can enter the first flow passage 11 through the first orifice group 43 and the second orifice group 44, and the first flow passage 11 and the second flow passage 12 can be communicated with each other, so that the flow rate of the medium can be controlled by the valve body 4.

The utility model discloses in, case 4 is cylinder type structure, simple structure, convenient processing, tolerance are little, can avoid the sword phenomenon that shakes. Valve rod 5 and case 4 are through integrated into one piece, not only can increase product bulk strength, and valve rod 5 can drive case 4 and carry out up-and-down motion moreover, and the size of controlled flow to realize opening and closing of valve. The anti-rotation structure 7 is matched with the guide groove 72 through the guide key 71, so that the valve core 4 can only move up and down in the valve body 1, the condition that the valve core 4 rotates in the valve body 1 due to unbalanced acting force of a medium is effectively prevented, damage to a valve due to rotation of the valve core 4 is avoided, the overall performance and the service life of the double-seat regulating valve are improved, and the control system is more stable in operation.

In embodiments of the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

In the description of the embodiments of the present invention, it should be understood that the terms "upper" and "lower" are used for indicating the position or the positional relationship based on the position or the positional relationship shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but not for indicating or implying that the indicated device or unit must have a specific direction, be constructed and operated in a specific position, and thus, should not be construed as limiting the embodiments of the present invention.

In the description herein, the description of the terms "one embodiment," "a preferred embodiment," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims (10)

1. An integrated double-seat regulating valve core for a double-seat regulating valve, the double-seat regulating valve comprises a valve body (1), an upper valve seat (2), a lower valve seat (3), a valve core (4) and a valve rod (5), the upper valve seat (2) is arranged at the upper part of the valve body (1), the lower valve seat (3) is arranged at the lower part of the valve body (1), the valve core (4) is arranged inside the valve body (1), the valve rod (5) is fixedly connected with the top of the valve core (4) and is used for driving the valve core (4) to move up and down, the double-seat regulating valve core is characterized in that,

the valve core (4) is of a cylindrical structure, the upper portion of the valve core is matched with the upper valve seat (2), and the lower portion of the valve core is matched with the lower valve seat (3), so that the valve core (4) can move up and down along the lower valve seat (3) and the upper valve seat (2).

2. The integrated double seat regulator valve cartridge according to claim 1, wherein the cartridge (4) comprises:

a valve core shell (41) provided with a cavity inside, wherein the cavity is used for conveying a medium;

the partition plate (42) is fixedly connected inside the valve core shell (41) and divides the valve core shell (41) into two cavities, wherein the cavity above the partition plate (42) is an upper cavity, the cavity below the partition plate (42) is a lower cavity, the lower cavity is matched with the lower valve seat (3), and the upper cavity is matched with the upper valve seat (2);

the first throttling hole group (43) is arranged at the upper part of the valve core shell (41) and communicated with the upper cavity so as to regulate and control the flow passing through the upper valve seat (2);

and the second throttling hole group (44) is arranged at the lower part of the valve core shell (41) and is communicated with the lower cavity so as to regulate and control the flow passing through the lower valve seat (3).

3. The integrated two-seat regulator valve cartridge of claim 2, wherein the cartridge housing (41) is further provided at its periphery with:

a first sealing surface (411) located at the periphery of the top of the spool housing (41) and corresponding to the upper valve seat (2) for improving the sealing property between the spool housing (41) and the upper valve seat (2);

and a second sealing surface (412) which is positioned at the periphery of the middle part of the valve core shell (41) and corresponds to the lower valve seat (3) and is used for improving the sealing property between the valve core shell (41) and the lower valve seat (3).

4. The integrated two-seat regulator valve cartridge of claim 2, wherein the first orifice set (43) and the second orifice set (44) are each a plurality, and the first orifice set (43) and the second orifice set (44) are equal in number.

5. The integrated double seat regulator valve spool according to claim 3, wherein the first orifice group (43) comprises a plurality of first orifices (431), the plurality of first orifices (431) are located on the same outer annular surface of the upper cavity, the second orifice group (44) is a plurality of second orifices (441), the plurality of second orifices (441) are located on the same outer annular surface of the lower cavity, and the diameter of the first orifices (431) is the same as that of the second orifices (441).

6. The integrated double seat regulator valve spool according to claim 5, wherein a plurality of first orifices 431 in the first orifice group 43 and a plurality of second orifices 441 in the second orifice group 44 are in one-to-one correspondence, and a distance between a center of the first orifices 431 and a bottom of the first sealing surface 411 and a distance between a center of the second orifices 441 and a bottom of the second sealing surface 412 are equal in the corresponding positions.

7. The integrated double-seat regulating valve core according to claim 2, characterized in that the core housing (41) is further opened with a through-flow hole (45), and the through-flow hole (45) is communicated with the upper cavity to increase the flow capacity of the core (4).

8. The integrated double seat regulator valve cartridge according to claim 7, wherein the through-flow hole (45) is plural, and the sum of the areas of the plural through-flow holes (45) is not less than 1.2 times the area of the inner diameter of the lower valve seat (3).

9. The integrated double-seat regulating valve core according to claim 1, characterized in that a shaft sleeve (6) is installed on the upper portion of the valve body (1), the shaft sleeve (6) is sleeved on the periphery of the valve rod (5), and an anti-rotation structure (7) is arranged between the shaft sleeve (6) and the valve rod (5) so that the valve rod (5) can move up and down.

10. The integrated double-seat regulator valve cartridge according to claim 9, characterized in that the anti-rotation structure (7) comprises:

a guide key (71) mounted on the inner side surface of the shaft sleeve (6);

and the guide groove (72) is arranged at the lower part of the valve rod (5), corresponds to the guide key (71) and is used for limiting the guide key (71) to move up and down.

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