CN113983186A

CN113983186A - Combined valve seat and valve

Info

Publication number: CN113983186A
Application number: CN202111272181.XA
Authority: CN
Inventors: 李连翠; 王子琪; 张含; 贾俊阳; 龚胜泉; 刘春玲
Original assignee: Shanghai Power Equipment Research Institute Co Ltd
Current assignee: Shanghai Power Equipment Research Institute Co Ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2022-01-28

Abstract

The invention belongs to the technical field of valves and discloses a combined valve seat and a valve. The combined valve seat comprises a sealing element and a valve seat base, wherein the sealing element is of an annular structure which is symmetrical up and down, the upper port and the lower port of an inner hole of the sealing element are both annular sealing parts, and any one of the two annular sealing parts can be abutted against the valve core; the valve seat base is provided with a through hole along the axial direction, the valve seat base is provided with an annular mounting groove, a sealing element is arranged in the mounting groove in a sealing mode, and the inner wall of the sealing element abuts against the inner side wall of the groove of the mounting groove. The combined valve seat can be used for multiple times, has long service life, and can be installed and replaced quickly and conveniently.

Description

Combined valve seat and valve

Technical Field

The invention relates to the technical field of valve structures, in particular to a combined valve seat and a valve.

Background

The valve is a control part in a pipeline fluid conveying system, is used for changing the section of a passage and the flowing direction of a medium, and has the functions of diversion, cut-off, throttling, non-return, diversion, overflow pressure relief and the like. Valves used for fluid control range from the simplest shut-off valves to the various valves used in extremely complex autonomous systems, ranging in variety and specification from the very tiny instrument valves up to industrial pipeline valves with nominal diameters of up to 10 m. The valve can be used for controlling various types of fluid such as water, steam, oil products, gas, slurry, various corrosive media, liquid metal, radioactive fluid and the like to flow, the working pressure of the valve can be ultrahigh pressure from 0.0013MPa to 1000MPa, and the working temperature can be from ultralow temperature of minus 270 ℃ to high temperature of 1430 ℃.

The valve sealing surface refers to the part of the valve seat and the opening and closing part which are contacted with each other, and the valve sealing surface generates different degrees of abrasion and defects under the actions of corrosion, scouring and mechanical load of used media, particularly when the valve sealing surface is used for a shut-off valve, a hard seal ball valve and a gate valve with granular media. When the sealing performance of the valve is influenced, the sealing surface needs to be repaired. The main method of repair is grinding, and if the grinding cannot repair the wear and defects, various other repair processes, such as machining, welding, plating, bonding, heat treatment, etc., are used to restore the original size, accuracy and performance of the sealing surface, which is quite complicated.

Fig. 1 is a cross-sectional view of a valve seat 1 in the prior art, the valve seat 1 is an annular structure, a valve seat sealing portion 11 is arranged at an upper port of an inner wall, a sealing portion chamfer 12 is arranged on the valve seat sealing portion 11, and a valve core abuts against the sealing portion chamfer 12 to form a seal when the valve is closed. In the long-term use process of the valve, the fluid medium continuously erodes the sealing part 11 of the valve seat, especially under the condition of small opening degree of the valve, the scouring force of the fluid medium to the valve core and the sealing part chamfer 12 is more severe, so that the sealing part chamfer 12 is easily abraded, and the sealing performance of the valve is damaged. When the valve seat sealing part 11 is maintained, the whole valve seat 1 needs to be disassembled; and when the problem can not be solved in maintenance, the whole valve seat 1 part needs to be replaced, the maintenance cost is greatly increased, and the maintenance process becomes more complicated.

Disclosure of Invention

It is an object of the present invention to provide a modular valve seat that is reusable, has a long service life, and can be quickly and easily installed and replaced.

Another object of the present invention is to provide a valve using the above-mentioned combined valve seat, which has the advantage of long service life.

In order to achieve the purpose, the invention adopts the following technical scheme:

the combined valve seat comprises a sealing element and a valve seat base, wherein the sealing element is of an annular structure which is symmetrical up and down, the upper port and the lower port of an inner hole of the sealing element are both annular sealing parts, and any one of the two annular sealing parts can be abutted against the valve core; the valve seat base is provided with a through hole along the axial direction, the valve seat base is provided with an annular mounting groove, a sealing element is arranged in the mounting groove in a sealing mode, and the inner wall of the sealing element abuts against the inner side wall of the groove of the mounting groove.

Optionally, the upper annular sealing portion abuts against the valve core, and the lower annular sealing portion is not higher than the port of the inner side wall of the groove.

Optionally, the annular seal is a hard-metal overlay welded.

Optionally, a sealing chamfer abutting against the valve core is provided on the annular sealing portion.

Optionally, a buffering inclined plane is arranged at the upper port of the inner wall of the valve seat base.

Optionally, the sealing device further comprises a sealing gasket, and the sealing gasket is arranged between the sealing member and the valve seat base in a sealing manner.

Optionally, the upper end face and the lower end face of the sealing element are both concavely provided with a limiting step, and a sealing gasket is hermetically arranged between the step end face of the limiting step below and the groove bottom wall of the mounting groove.

Optionally, a sealing groove is arranged on the bottom wall of the groove, and the sealing gasket is arranged in the sealing groove.

Another objective of the present invention is to provide a valve, which includes a valve body, a valve core and a combined valve seat according to any of the above schemes, wherein the valve core and the combined valve seat are both installed inside the valve body; when the valve is closed, the valve core is in sealing and abutting connection with the sealing element.

Optionally, a sealing surface is provided on the valve core, and when the valve is closed, the sealing surface abuts against the sealing chamfer of the sealing member.

Has the advantages that:

the combined valve seat comprises a sealing piece and a valve seat base, wherein the sealing piece is of a structure which is symmetrical up and down, the upper end surface structure and the lower end surface structure are completely the same, the upper surface and the lower surface can be used, and the service life is doubled. And this sealing member simple structure mutually supports with the mounting groove of disk seat base, can convenient, swift install in inside the valve, has prolonged the life of this combination formula disk seat and the valve of using this combination formula disk seat greatly.

Drawings

FIG. 1 is a cross-sectional view of a valve seat provided by the prior art;

FIG. 2 is a cross-sectional view of a composite valve seat provided by an embodiment of the present invention.

In the figure:

1. a valve seat; 11. a valve seat sealing portion; 12. chamfering the sealing part;

100. a seal member; 110. an annular seal portion; 111. sealing and chamfering; 120. a step end face;

200. a valve seat base; 210. a base top surface; 220. installing a groove; 221. the inner side wall of the groove; 222. the outer side wall of the groove; 223. a groove bottom wall; 230. sealing the groove; 240. a buffer bevel;

400. a gasket seal.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The following describes in detail a specific embodiment of a combined valve seat according to an embodiment of the present invention with reference to the drawings. The combined valve seat is a direct pressure type valve seat, can be used for valve seats of stop valves, regulating valves, control valves and the like, is not limited to the type of the valve, and can be used as long as the direct pressure type valve seat is used.

Referring to fig. 1, fig. 1 is a cross-sectional view of a valve seat 1 provided in the prior art. In the long-term use process of the valve seat 1, the fluid medium continuously washes the valve seat sealing part 11, so that the sealing part chamfer 12 is easily abraded, and the sealing performance of the valve is damaged. When the valve seat sealing part 11 is maintained, the whole valve seat 1 needs to be disassembled; and when the problem can not be solved in maintenance, the whole valve seat 1 part needs to be replaced, the maintenance cost is greatly increased, and the maintenance process becomes more complicated.

Referring to fig. 2, fig. 2 is a cross-sectional view of the assembled valve seat of the present embodiment. The combined valve seat comprises a sealing element 100 and a valve seat base 200, wherein the sealing element 100 is of an annular structure which is symmetrical up and down, the upper port and the lower port of the inner hole of the sealing element 100 are both annular sealing parts 110, and any one of the two annular sealing parts 110 can be abutted against a valve core; the valve seat base 200 is provided with a through hole along the axial direction, the valve seat base 200 is provided with an annular mounting groove 220, the sealing element 100 is hermetically arranged in the mounting groove 220, and the inner wall of the sealing element 100 abuts against the groove inner side wall 221 of the mounting groove 220. The combined valve seat comprises a sealing element 100 and a valve seat base 200 which are arranged up and down, wherein the sealing element 100 is of a structure which is symmetrical up and down, the structure of the upper end surface and the structure of the lower end surface are completely the same, the use of the upper surface and the lower surface can be realized, and the service life is doubled. When one of the annular sealing portions 110 is worn, the sealing element 100 is only required to be turned over and reinstalled in the valve seat base 200; the sealing element 100 has a simple structure, is matched with the mounting groove 220 of the valve seat base 200, and can be conveniently and quickly mounted in the valve; when the annular sealing part 110 is maintained, only the sealing element 100 needs to be detached, and when the problem cannot be solved in maintenance, only the sealing element 100 needs to be replaced without replacing the whole valve seat base 200, so that the service life of the combined valve seat is greatly prolonged, the maintenance, repair and replacement costs are reduced, and good economic benefits are achieved.

Specifically, the upper annular seal portion 110 abuts against the valve element, and the lower annular seal portion 110 is not higher than the port of the groove inner side wall 221. Thus, when the sealing member 100 is installed in the installation groove 220, the lower annular sealing portion 110 is protected on the groove inner side wall 221 of the valve seat base 200, so that the lower annular sealing portion 110 is not washed by fluid medium in the valve, and the service life of the lower annular sealing portion 110 is prolonged. Further, the annular seal portion 110 is a hard alloy formed by overlay welding. Of course, as a general choice in the art, a sealing ring made of rubber, plastic, or the like may be used as the sealing member at the annular sealing portion 110. The hard alloy of the annular sealing portion 110 is deposited by welding to enhance the sealing performance of the valve sealing surface, prevent leakage, and prolong the service life. The surfacing welding has the advantages of fully playing the performance advantages of the materials, saving the materials and prolonging the service life of parts. The physical essence, metallurgical process and thermal process of the hard alloy surfacing process are similar to those of a common welding process, and the hard alloy surfacing method on the sealing surface of the valve comprises electrode arc surfacing, oxy-acetylene flame surfacing, submerged arc surfacing, gas shielded surfacing, plasma arc surfacing, high-frequency induction surfacing, laser surfacing and the like according to the surfacing conditions. For the valve working under the condition of high temperature and high pressure, the working condition of the annular sealing portion 110 is quite severe, so that the requirement on the sealing performance is high, and the hard alloy has excellent performances of high hardness, corrosion resistance and high pressure resistance, is the most common material for overlaying the sealing surface of the valve, can be subjected to overlaying by selecting a proper mode according to the characteristics of the product, and the embodiment is not particularly limited.

Further, the annular seal portion 110 is provided with a seal chamfer 111 that abuts against the valve body. The valve seal area is typically comprised of a pair of seal pairs, one on seal 100 and the other on the valve core. In the use process of the valve, the sealing parts of the valve are subjected to the scouring and corrosion of media for a long time, and meanwhile, the friction and the abrasion between the sealing parts exist, so the working condition is quite severe. One of the most widespread uses of valves in pipelines and equipment is to cut off the flow of a medium, in which case the valve is closed and no over-standard leakage between the sealing parts of the valve must occur, so that its tightness is the main factor in determining whether an internal leakage occurs or not. The annular sealing part 110 is provided with a sealing chamfer 111 abutting against the valve core, so that line sealing or surface sealing can be formed between the sealing element 100 and the valve core. Preferably, a buffering slant 240 is provided at the upper port of the inner wall of the valve seat base 200. The buffer bevel 240 reduces the impact of the fluid medium in the valve on the valve seat base 200, further reduces the erosion and wear of the annular sealing portion 110 located below, and prolongs the service life of the sealing element 100.

Optionally, as shown in fig. 2, the assembled valve seat further comprises a sealing gasket 400, wherein the sealing gasket 400 is sealingly disposed between the sealing member 100 and the valve seat base 200. The sealing gasket 400 enhances the sealing effect between the seal 100 and the valve seat base 200. The sealing gasket 400 is preferably an elastic member and has good mechanical properties; and according to different use environments, the material can also be made of wear-resistant, high-temperature-resistant and corrosion-resistant materials. In this embodiment, the sealing gasket 400 is preferably a wound gasket, which is particularly suitable for applications such as uneven load, loose joint force, periodic temperature and pressure changes, and impact or vibration, and is an ideal static sealing component for components such as valves, pumps, heat exchangers, and the like.

Further, the upper and lower end faces of the sealing element 100 are both concavely provided with a limiting step, and a sealing gasket 400 is hermetically arranged between the step end face 120 of the lower limiting step and the groove bottom wall 223 of the mounting groove 220. Preferably, the step end face 120 of the upper limit step and the base top face 210 of the valve seat base 200 are located on the same horizontal plane and are used for being installed in cooperation with the sleeve inside the valve, and the sealing gasket 400 is installed between the step end face 120 of the lower limit step and the groove bottom wall 223 of the installation groove 220, so that the sealing gasket 400 is effectively fixed, the sealing effect is improved, and the fluid medium is prevented from leaking between the sealing element 100 and the valve seat base 200. Preferably, the groove bottom wall 223 is provided with a sealing groove 230, and the sealing gasket 400 is disposed in the sealing groove 230. The seal groove 230 effectively secures the sealing gasket 400 between the seal 100 and the valve seat base 200, improving the stability of the installation.

Another objective of the present invention is to provide a valve, which includes a valve body, a valve core and a combined valve seat according to any of the above schemes, wherein the valve core and the combined valve seat are both installed inside the valve body; when the valve is closed, the valve core is in sealing contact with the sealing element 100. The valve uses the combined valve seat, can be conveniently and quickly installed inside the valve, realizes double-sided use of the sealing element 100, and only needs to turn over the sealing element 100 and reinstall the sealing element 100 into the valve seat base 200 when one sealing part is worn. Meanwhile, when the sealing element 100 is repaired or replaced, only the sealing element needs to be disassembled and replaced, so that the maintenance, repair and replacement costs are reduced, and good economic benefits are achieved.

Optionally, the valve element is provided with a sealing surface which abuts against a sealing chamfer 111 of the seal 100 when the valve is closed. The sealing surface on the valve core is the end surface of the chamfer angle on the valve core, the chamfer angle is different from the sealing chamfer angle 111 of the sealing element 100, and the two chamfer angles are abutted when the valve is closed, so that linear sealing is formed between the valve core and the sealing element 100, the flushing damage of the sealing part of the valve is effectively prevented, and the valve leakage grade is improved. Of course, the valve core and the sealing member 100 may also be processed into a surface sealing type, so as to further improve the anti-leakage effect, but the requirement on the processing technology is more strict, and the specific choice may be selected according to the requirements of the actual application environments such as the type, temperature, pressure, and the like of the fluid medium, which is not specifically limited in this embodiment.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A modular valve seat, comprising:

the sealing element (100) is of an annular structure which is symmetrical up and down, the upper port and the lower port of the inner hole of the sealing element (100) are both annular sealing parts (110), and any one of the two annular sealing parts (110) can be in sealing contact with the valve core;

the sealing device comprises a valve seat base (200), wherein a through hole is axially formed in the valve seat base (200), an annular mounting groove (220) is formed in the valve seat base (200), the sealing element (100) is arranged in the mounting groove (220) in a sealing mode, and the inner wall of the sealing element (100) abuts against the inner side wall (221) of the mounting groove (220).

2. The combined valve seat according to claim 1, wherein the upper annular sealing portion (110) abuts against the valve element, and the lower annular sealing portion (110) is not higher than the port of the groove inner side wall (221).

3. The combined valve seat according to claim 2, wherein the annular sealing portion (110) is a hard alloy that is weld deposited.

4. The combined valve seat according to claim 3, characterized in that the annular sealing portion (110) is provided with a sealing chamfer (111) abutting against the valve element.

5. The combined valve seat according to claim 4, characterized in that the upper port of the inner wall of the valve seat base (200) is provided with a buffer bevel (240).

6. The modular valve seat according to claim 1, further comprising a sealing gasket (400), the sealing gasket (400) being sealingly disposed between the seal (100) and the valve seat base (200).

7. The combined valve seat according to claim 6, wherein the upper and lower end faces of the sealing element (100) are both concavely provided with a limiting step, and the sealing gasket (400) is hermetically arranged between the step end face (120) of the limiting step positioned below and the groove bottom wall (223) of the mounting groove (220).

8. The modular valve seat according to claim 7, wherein a sealing groove (230) is provided on the groove bottom wall (223), the sealing gasket (400) being seated in the sealing groove (230).

9. A valve comprising a valve body, a valve element and a combined valve seat according to any one of claims 1 to 8, wherein the valve element and the combined valve seat are both mounted inside the valve body; when the valve is closed, the valve core is in sealing butt joint with the sealing element (100).

10. Valve according to claim 9, characterized in that the valve element is provided with a sealing surface which, when the valve is closed, abuts against a sealing chamfer (111) of the seal (100).