Axial flow valve convenient and easy to maintain

Abstract

The utility model relates to the technical field of axial flow valves, in particular to an axial flow valve convenient and easy to maintain, which comprises a valve body, a valve core and a valve seat, the valve core and the valve seat are mounted in the valve body, a control mechanism is arranged on the valve body, the control mechanism is used for controlling the valve core to be contacted with or separated from the valve seat, and the valve seat is detachably mounted on the valve body. The sealing ring is detachably mounted on the main body of the valve core, so that the split type structure of the valve core is realized, the valve core and the valve seat do not need to be reprocessed and matched during field replacement and maintenance, the adjusting mechanism can reduce the abrasion sealing compression amount of the sealing surface after compensation operation, and the problems that the existing valve core is a single part, the sealing between the valve core and the valve seat fails, and the service life of the valve core is prolonged are solved. In the prior art, a soft sealing auxiliary ring, a valve core and a valve seat are mostly required to be returned to a factory to be replaced, the cost is high, and particularly when a sealing pair of a large-caliber valve, the valve core and the valve seat loses efficacy seriously, a sealing line needs to be matched and machined again, and the maintenance cost is high.

Description

Technical Field

[0001] The utility model relates to the technical field of axial flow valves, in particular to an axial flow valve that is convenient for maintenance. Background Art

[0002] The existing axial flow valve spool is a single part and has a cylindrical structure; when the large-bore specification is adopted, the spool is mostly a structure in which a spool head and a spool cylinder are welded together, and it is impossible to adjust the position of the sealing line within a large range at the application site. For example, only by giving a signal to the equipped electric / pneumatic actuator to increase the action stroke in the valve closing direction to realize the micro-adjustment of the sealing line position. Taking a typical structure as an example, for valves with a small bore of less than DN400, the maximum effective displacement of the sealing line that can be adjusted is 0.05 mm - 0.15 mm, and for valves of DN400 and above, the maximum effective displacement of the sealing line that can be adjusted is about 0.15 mm - 0.7 mm. There will be differences due to the structural differences of various axial flow valve products.

[0003] Due to its small flow resistance, large adjustable ratio higher than that of traditional valves, high adjustment accuracy, small output force and many other advantages, the axial flow valve is mostly used in pressure regulating stations and metering stations of long-distance natural gas pipelines, mainly for regulating flow and pressure. It can also be used to regulate flow and pressure on long-distance oil pipelines. It is a key control valve for pressure regulation and flow regulation of long-distance natural gas pipelines and long-distance oil pipelines. In the prior art, since the pressure regulating station yard and metering station yard are flammable and explosive occasions, the valve transmission part is relatively special. After the valve seat and spool are disassembled and repaired on-site, it is very difficult to restore the whole machine. When the axial flow valve is applied to a long-distance oil pipeline, when the medium contains fine particles that have not been filtered out, it is also easy to cause the sealing failure of the spool and valve seat sealing pair, resulting in internal leakage of the valve and affecting the adjustment accuracy of the whole device. If the seal between the spool and the valve seat fails, it is mostly necessary to return the parts to the factory for replacement of the soft seal auxiliary ring, spool and valve seat, which is costly. Especially for valves with a larger diameter, when the sealing pair between the spool and the valve seat fails severely, the sealing line needs to be remade and processed again, with high maintenance costs and long maintenance cycles. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is: to solve the problem that the existing spool is a single part, and when the seal between the spool and the valve seat fails, it is mostly necessary to return the parts to the factory for replacement of the soft seal auxiliary ring, spool and valve seat, which is costly. Especially for valves with a larger diameter, when the sealing pair between the spool and the valve seat fails severely, the sealing line needs to be remade and processed again, with high maintenance costs and long maintenance cycles. Now, an axial flow valve that is convenient for maintenance is provided.

[0005] The technical solution adopted by the present utility model to solve its technical problems is as follows: An axial flow valve that is convenient for maintenance, comprising a valve body, a valve core and a valve seat installed in the valve body. A control mechanism for controlling the valve core to contact or disengage from the valve seat is provided on the valve body, and the valve seat is detachably installed on the valve body;

[0006] The valve core includes a main body, a sealing ring is detachably installed on the main body, the sealing ring is arranged opposite to the valve seat, a sealing surface in contact with the valve seat is provided on the sealing ring, and an adjusting mechanism is provided between the main body and the sealing ring. The adjusting mechanism is used to adjust the position of the sealing ring. Compared with the prior art, in this solution, the sealing ring is detachably installed on the main body of the valve core, realizing a split structure of the valve core. When replacing and maintaining on-site, it is not necessary to reprocess and fit the valve core and valve seat, and the adjusting mechanism can reduce the compensation for the wear of the sealing surface and the sealing compression amount after operation.

[0007] In order to implement the adjustment mechanism, in some preferred embodiments, the adjusting mechanism includes a plurality of adjusting gaskets, and the plurality of adjusting gaskets are stacked on each other and installed between the main body and the sealing ring. By providing a plurality of stacked adjusting gaskets between the main body and the sealing ring, the worn sealing surface is adjusted to the required position, and the sealing compression amount when the sealing surface contacts the valve seat is ensured.

[0008] In order to meet the adjustment requirements for sealing, in some preferred embodiments, any one of the plurality of adjusting gaskets is an arrangement combination of graphite gaskets, PTFE gaskets, rubber gaskets and composite material sealing gaskets. By using any one of the arrangement combinations formed by graphite gaskets, PTFE gaskets, rubber gaskets and composite material sealing gaskets for the combination of the adjusting gaskets, different requirements for adjusting the sealing surface are met.

[0009] In order to realize the detachable installation of the sealing ring on the main body, in some preferred embodiments, the sealing ring is detachably installed on the main body by one of screws, external clamps or split ring compression rings. The sealing ring is detachably installed on the main body by screws, the sealing ring can also be detachably installed on the main body by external clamps, or the sealing ring is detachably installed on the main body by split ring compression rings.

[0010] In some preferred embodiments, an elastic gasket is provided between the sealing ring and one of the screws, external clamps or split ring compression rings.

[0011] In order to improve the sealing performance between the valve core and the valve body, in some preferred embodiments, the valve seat includes a first valve seat and a second valve seat which are installed in the valve body and in contact with each other. The first valve seat is made of a flexible material, and the second valve seat is made of metal. When the valve core is in the closed state, both the first valve seat and the second valve seat are in contact with the sealing surface of the sealing ring. By having both the first valve seat and the second valve seat in contact with the sealing surface of the sealing ring, with the first valve seat made of a flexible material and the second valve seat made of metal, the sealing performance of the valve body is improved through the combination of soft sealing and hard sealing.

[0012] In order to facilitate the installation of the first valve seat, in some preferred embodiments, a positioning mechanism for positioning the first valve seat is provided on the second valve seat. By providing a positioning mechanism on the second valve seat, the positioning mechanism is used to position the first valve seat, ensuring the rapid installation of the first valve seat and improving the installation efficiency.

[0013] In order to implement the positioning mechanism, in some preferred embodiments, the positioning mechanism includes a positioning groove installed on the second valve seat. The positioning groove is located at one end of the second valve seat close to the valve core, and the first valve seat is installed in the positioning groove. By providing a positioning groove at one end of the second valve body close to the valve core, with the positioning groove matching the first valve seat, the first valve seat can be quickly installed onto the second valve seat, improving the installation efficiency of the valve seat.

[0014] In some preferred embodiments, it further includes a sleeve. The sleeve is installed in the flow channel, the valve core is slidably installed in the sleeve, the sleeve is provided with through holes penetrating its inner and outer peripheral walls, one end of the sleeve located in the flow channel abuts against the valve body, and the other end of the sleeve abuts against the valve seat.

[0015] In order to facilitate the installation of the sleeve and the valve seat, in some preferred embodiments, a retaining ring is threadedly connected to the valve body. The retaining ring abuts against the valve seat, and the valve seat is located between the sleeve and the retaining ring. The retaining ring is used to fixedly install the sleeve and the valve seat on the valve body.

[0016] The beneficial effects of the present utility model are as follows: When the axial flow valve which is convenient for maintenance and easy to repair according to the present utility model is in use, by detachably installing a sealing ring on the main body of the valve core, a split structure of the valve core is realized. During on-site replacement and maintenance, there is no need to reprocess and match the valve core and the valve seat. And the adjustment mechanism can reduce the sealing compression amount for compensating the wear of the sealing surface after operation, avoiding the problems that in the prior art, the valve core is a single part, the sealing between the valve core and the valve seat fails, and it is often necessary to take the valve off the production line and return it to the factory to replace the soft sealing auxiliary ring, the valve core and the valve seat, resulting in high costs. Especially for valves with a larger diameter, when the sealing pair between the valve core and the valve seat fails severely, the sealing line needs to be reprocessed, with high maintenance costs and long maintenance cycles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0018] Figure 1 is a schematic structural view of the present utility model;

[0019] Figure 2 is Figure 1 a partial enlarged view of A in

[0020] In the figure: 1. valve body, 101. valve cavity, 2. valve core, 201. main body, 202. sealing ring, 3. valve seat, 301. first valve seat, 302. second valve seat, 4. adjusting gasket, 5. screw, 6. elastic gasket, 7. positioning groove, 8. sleeve, 9. retaining ring, 10. first transmission shaft, 11. second transmission shaft. Specific embodiments

[0021] The present utility model will be further described in detail below in conjunction with embodiments:

[0022] The present utility model is not limited to the following specific embodiments. Those of ordinary skill in the art can implement the present utility model in other various specific embodiments according to the content disclosed in the present utility model, or those that simply change or modify by adopting the design structure and concept of the present utility model all fall within the protection scope of the present utility model. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0023] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0024] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0025] As Figure 1-2 shown, an axial flow valve that is convenient for maintenance includes a valve body 1, a valve core 2, and a valve seat 3. A valve cavity 101 is provided on the valve body 1. Since the upstream and downstream ends of this valve are not fixed, in this embodiment, the right end of the valve cavity 101 is the medium input end, and the left end of the valve cavity 101 is the medium output end. It can also be another embodiment where the left end of the valve cavity 101 is the medium input end and the right end of the valve cavity 101 is the medium output end. The valve core 2 and the valve seat 3 cooperate with each other and are installed in the valve cavity 101. A control mechanism is provided on the valve body 1, and the control mechanism is used to control the valve core 2 to contact or disengage from the valve seat 3. In this embodiment, the control mechanism includes a first transmission shaft 10 and a second transmission shaft 11. The first transmission shaft 10 is located in the valve cavity 101 of the valve body 1. One end of the first transmission shaft 10 is slidably installed in the valve cavity 101, and the other end of the first transmission shaft 10 is fixedly connected to the valve core 2. The second transmission shaft 11 is slidably installed on the valve body 1, and one end of the second transmission shaft 11 extends into the valve cavity 101 of the valve body 1. The first transmission shaft 10 and the second transmission shaft 11 are arranged perpendicular to each other, and helical teeth are provided on both the first transmission shaft 10 and the second transmission shaft 11. The helical teeth on the first transmission shaft 10 and the helical teeth on the second transmission shaft 11 mesh with each other. This control mechanism has high transmission accuracy and high transmission efficiency, adapts to the high adjustment accuracy requirements of the axial flow valve, and adapts to the low output thrust / torque actuator requirements of the axial flow valve. The valve seat 3 is detachably installed on the valve body 1;

[0026] The valve core 2 includes a main body 201. The sealing ring 202 is detachably installed on the main body 201 by screws 5. An elastic gasket 6 is provided between the sealing ring 202 and the screws 5. The sealing ring 202 is arranged opposite to the valve seat 3. A sealing surface in contact with the valve seat 3 is provided on the sealing ring 202. An adjusting mechanism is provided between the main body 201 and the sealing ring 202. The adjusting mechanism includes a plurality of adjusting gaskets 4. The plurality of adjusting gaskets 4 are stacked on each other and installed between the main body 201 and the sealing ring 202 to realize the adjusting mechanism for adjusting the position of the sealing ring 202.

[0027] In this embodiment, the disassembly method of the sealing ring 202 and the main body 201 is not limited to the conventional screw 5 pressing method, and can be changed to an external clamp pressing method, a split pressing ring, etc. according to actual needs.

[0028] The plurality of adjusting gaskets 4 are any permutation and combination of graphite gaskets, PTFE gaskets, rubber gaskets and composite material sealing gaskets. In this embodiment, the composite material sealing gasket can be a metal foil graphite coated gasket, a PTFE coated gasket, a modified PTFE material coated gasket added with other applicable materials, etc., which contain dash round holes, square holes or special-shaped holes.

[0029] The valve seat 3 includes a first valve seat 301 and a second valve seat 302 which are installed on the valve body 1 and in contact with each other. The material of the first valve seat 301 is a flexible material, and the material of the second valve seat 302 is metal. When the valve core 2 is in the closed state, both the first valve seat 301 and the second valve seat 302 are in contact with the sealing surface of the sealing ring 202. The combination of soft and hard seals is to express that this composite sealing type not only ensures strict cut-off sealing, but also improves the reliability of the seal.

[0030] A positioning mechanism for positioning the first valve seat 301 is provided on the second valve seat 302. The positioning mechanism includes a positioning groove 7 installed on the second valve seat 302. The positioning groove 7 is located at one end of the second valve seat 302 close to the valve core 2, and the first valve seat 301 is installed in the positioning groove 7.

[0031] It further includes a sleeve 8. The sleeve 8 is installed in the valve cavity 101. The valve core 2 is slidably installed in the sleeve 8. The sleeve 8 is provided with through holes penetrating its inner and outer peripheral walls. One end of the sleeve 8 located in the valve cavity 101 abuts against the valve body 1, and the other end of the sleeve 8 abuts against the valve seat 3. A retaining ring 9 is threadedly connected to the valve body 1, and the retaining ring 9 abuts against the valve seat 3. The valve seat 3 is located between the sleeve 8 and the retaining ring 9.

[0032] When the above-mentioned axial flow valve which is convenient for maintenance is in use, the external power mechanism is used to control the axial displacement of the second transmission shaft 11, drive the first transmission shaft 10 to displace, and then the first transmission shaft 10 drives the valve core 2 to displace, controlling the contact or separation between the valve core 2 and the valve seat 3. During the horizontal movement of the valve core 2, the position changes of the windows and small holes on the sleeve 8 are used to control the change of the medium flow rate, so as to realize the adjustment of the medium flow rate. When the valve is fully closed, it is completely cut off, and the sealing surface of the valve core 2 is in contact with the valve seat 3;

[0033] During maintenance, rotate the retaining ring 9 threadedly connected to the valve seat 3 to loosen the retaining ring 9 to the valve body 1, and take out the second valve seat 302 and the second valve seat 302 from the valve cavity 101. At this time, perform operations on the valve core 2. According to the sealing condition, adjust the adjusting mechanism, add adjusting gaskets 4, and change the position of the sealing surface on the sealing ring 202, so that the sealing position between the valve core 2 and the valve seat 3 can be adjusted according to the specific conditions of valve operation, without reprocessing and matching the valve core 2 and the valve seat 3, compensating for the reduction of the sealing compression amount due to the wear of the sealing surface after operation, realizing the function that the position of the sealing surface is adjustable and the corresponding sealing compression amount is adjustable. In practical applications, the adjustable sealing surface can be preset according to the actual needs of its application occasion to extend the service life of the valve on site, reduce the maintenance frequency, and at the same time can optimize the driving force and stroke settings of the actuator matched with it to a certain extent. Among them Figure 2 The dotted line in the figure represents the position of the sealing surface on the sealing ring 202 after wear after the valve core 2 operates. The thick black solid line corresponding to the upper right shift represents the position of the sealing line of the valve core 2 compensated after adjustment by the adjustable sealing gasket, which coincides with the corresponding sealing points of the flexible first valve seat 301 and the metal second valve seat 302. According to the actual pressure in the on-site application, after adjustment by the adjustable adjusting gasket 4, an appropriate amount of pre-compression of the valve core 2 and valve seat 3 sealing can be increased. This structure of the valve core 2 with an adjustable sealing surface solves the problems of difficult coordination of equipment such as hoisting, maintenance, and testing in remote areas, even if the coordination is in place, the hourly cost of starting work is very expensive and generally no hot work is allowed. Since most on-site applications are flammable and explosive occasions, generally no hot work is allowed. If hot work is required, a necessary application and approval process is needed, which prolongs the maintenance time, increases the maintenance cost, and the actual maintenance difficulty due to the lack of maintenance equipment. Generally, when the sealing surface of the valve core 2 is damaged or worn, there is no spare part for the valve core 2, and a certain preparation period is required, it can only be repaired in the factory, which brings great economic losses to both users and valve suppliers. In this solution, even if spare parts are prepared, only the split-type valve core 2 sealing ring 202 spare parts need to be prepared, which greatly saves the economic costs of valve suppliers and users, greatly reduces the maintenance difficulty, simplifies the maintenance process, and improves the work efficiency.

[0034] Based on the inspiration of the ideal embodiments of the present invention, through the above description, relevant staff can make various changes and modifications completely within the scope of not deviating from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An axial flow valve that is convenient for maintenance, comprising a valve body (1), a valve core (2) and a valve seat (3) installed in the valve body (1). A control mechanism is provided on the valve body (1), and the control mechanism is used to control the valve core (2) to contact or disengage from the valve seat (3), characterized in that: The valve seat (3) is detachably mounted on the valve body (1); The valve core (2) includes a main body (201), a sealing ring (202) is detachably mounted on the main body (201), the sealing ring (202) is arranged opposite to the valve seat (3), a sealing surface in contact with the valve seat (3) is provided on the sealing ring (202), and an adjusting mechanism is arranged between the main body (201) and the sealing ring (202), and the adjusting mechanism is used to adjust the position of the sealing ring (202).

2. The axial flow valve according to claim 1, which is convenient for easy maintenance, is characterized in that: The adjusting mechanism includes a plurality of adjusting gaskets (4), and the plurality of adjusting gaskets (4) are stacked on each other and mounted between the main body (201) and the sealing ring (202).

3. The axial flow valve according to claim 2, wherein: Any permutation and combination of the plurality of adjusting gaskets (4) is one of a graphite gasket, a PTFE gasket, a rubber gasket, and a composite material sealing gasket.

4. The axial flow valve according to claim 1, characterized in that: The sealing ring (202) is detachably mounted on the main body (201) by one of a screw (5), an external clamp, or a split ring compression ring.

5. The axial flow valve according to claim 3, characterized in that: An elastic gasket (6) is arranged between the sealing ring (202) and one of the screw (5), the external clamp, or the split ring compression ring.

6. The axial flow valve according to claim 1, characterized in that: The valve seat (3) includes a first valve seat (301) and a second valve seat (302) which are mounted on the valve body (1) and in contact with each other. The material of the first valve seat (301) is a flexible material, and the material of the second valve seat (302) is a metal. When the valve core (2) is in the closed state, both the first valve seat (301) and the second valve seat (302) are in contact with the sealing surface of the sealing ring (202).

7. The axial flow valve according to claim 6, characterized in that: A positioning mechanism for positioning the first valve seat (301) is provided on the second valve seat (302).

8. The axial flow valve according to claim 7, characterized in that: The positioning mechanism includes a positioning groove (7) mounted on the second valve seat (302), the positioning groove (7) is located at one end of the second valve seat (302) close to the valve core (2), and the first valve seat (301) is mounted in the positioning groove (7).

9. The axial flow valve according to claim 1, characterized in that: A sleeve (8) is further included. A valve cavity (101) is provided on the valve body (1), the sleeve (8) is mounted in the valve cavity (101), the valve core (2) is slidably mounted in the sleeve (8), through holes penetrating the inner and outer peripheral walls are provided on the sleeve (8), one end of the sleeve (8) located in the valve cavity (101) abuts against the valve body (1), and the other end of the sleeve (8) abuts against the valve seat (3).

10. An axial flow valve that is convenient for easy maintenance according to claim 9, characterized in that: A retaining ring (9) is threadedly connected to the valve body (1), the retaining ring (9) abuts against the valve seat (3), and the valve seat (3) is located between the sleeve (8) and the retaining ring (9).

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