CN213839617U - Parallel double-gate-plate gate valve - Google Patents

Abstract

The utility model relates to a parallel double-flashboard gate valve, which is applied to the technical field of high-temperature and high-pressure gate valves, solves the problem of erosion of high-temperature and steam media to a flashboard and a valve seat, and after the valve seat and the flashboard are put into high-temperature working condition for use, the valve comprises a valve body, a valve seat, a valve plate, a valve rod and a valve cover, wherein the valve seat and the valve plate are arranged in a relatively matched manner, wear-resistant layers are arranged on end faces of the valve seat and the valve plate which are relatively matched, a first transition layer is arranged between the end face of the valve seat and the corresponding wear-resistant layer, a second transition layer is arranged between the end face of the valve plate and the corresponding wear-resistant layer, the wear-resistant layers are made of cobalt-based alloy materials, and the first transition layer and the second transition layer are made of nickel-based alloy materials; the gate valve has the advantages of being good in air tightness, prolonging the service life of the whole gate valve and reducing the after-sale maintenance cost.

Description

Parallel double-gate-plate gate valve

Technical Field

The utility model discloses use at high temperature high pressure gate valve technical field, especially relate to a parallel double-disc gate valve.

Background

The gate valve is characterized in that an opening and closing part is a gate plate, the moving direction of the gate plate is perpendicular to the fluid direction, and the gate valve is normally opened and closed fully and is not adjusted and throttled. The surfaces of a valve seat and a flashboard in the gate valve are generally provided with a wear-resistant layer, the sealing performance of the gate valve is improved through the wear-resistant layer, the temperature and the pressure of a steam medium are increasingly high in the process of changing under the requirements of energy conservation and environmental protection of the current thermal power plant, in order to improve the heat efficiency, namely, a subcritical unit is continuously evolved into a supercritical unit and an ultra-supercritical unit, Fe elements in the valve seat and the flashboard are gradually diffused into the wear-resistant layers on the surfaces of the valve seat and the flashboard to form harmful phases under the long-term high-temperature working state of the valve seat and the flashboard, so that the transition areas between the wear-resistant layers of the valve seat and the flashboard and a body are subjected to micro-hardening, stress concentration is caused, a large number of micro cracks are formed in the transition areas between the wear-resistant layers of the valve seat and the flashboard and the body, and under the friction action of opening and closing of the valve seat and the flashboard, the wear-resistant layers on the surfaces of the valve seat and the flashboard can fall off, and then lead to the unable sealed of valve when using, get into and lead to the unable shutoff of valve, liquid in the pipeline overflows from between disk seat and the flashboard, influences valve and whole pipe-line system's normal work, and later stage repair process is complicated moreover, and the cost is higher.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a parallel double-gate board gate valve has solved the erosion of high temperature, steam medium to valve plate, disk seat to and disk seat, valve plate when the ooff valve, under the frictional action, the condition that drops can appear in the sealing layer on surface avoids leading to the valve inefficacy, influences the normal work of valve, reduces later stage maintenance, avoids the problem with high costs that the maintenance and change valve arouse.

In order to achieve the above purpose, the utility model adopts the technical scheme that:

the utility model provides a parallel double-gate board gate valve, including valve body, disk seat, valve plate, valve rod and valve gap, the disk seat cooperates the setting with the valve plate relatively, all be provided with the wearing layer on disk seat and the relative complex terminal surface of valve plate, be provided with first transition layer between the terminal surface of disk seat and the wearing layer that corresponds, be provided with the second transition layer between the terminal surface of valve plate and the wearing layer that corresponds, cobalt-based alloy material is chooseed for use to the wearing layer, nickel-based alloy material is all chooseed for use to first transition layer and second transition layer.

Further, the thickness of the wear-resistant layer is not less than 2.5 mm.

Further, the thickness of the first transition layer and the thickness of the second transition layer are both 1.25 mm-1.75 mm.

Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

the utility model discloses a parallel double-gate board gate valve, through adopting Inconel625 alloy as the transition layer with first transition layer and second transition layer, can be when the build-up welding sealing surface of production, the wearing layer diffusion of effectual separation disk seat and flashboard mother metal Fe element to both upper portions all set up, the iron element content of the final wearing layer of control, can help controlling the hardness of wearing layer, guarantee the performance of wearing layer, can be after the valve is put into use simultaneously, effectively avoid harmful looks's formation and diffusion on wearing layer and the mother metal faying face under the high temperature, prevent that it from droing, improve the holistic life of gate valve, reduce after-sale cost of maintenance.

Drawings

Some specific embodiments of the present invention will be described in detail hereinafter, by way of illustration and not by way of limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

fig. 1 is a schematic view of the overall structure in the embodiment of the present invention;

FIG. 2 is a schematic view of a valve seat structure according to an embodiment of the present invention;

fig. 3 is the valve plate structure sketch map in the embodiment of the utility model.

Wherein the reference numerals are as follows:

1. a valve body; 2. a valve seat; 3. a valve plate; 4. a valve stem; 5. a valve cover; 6. a wear layer; 7. a first transition layer; 8. a second transition layer.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Referring to fig. 1, for the utility model provides a pair of parallel double-gate board gate valve, including valve body 1, disk seat 2, valve plate 3, valve rod 4 and valve gap 5, disk seat 2 and the relative cooperation setting of valve plate 3.

Referring to fig. 2 and 3, the valve seat 2 and the valve plate 3 are provided with wear-resistant layers 6 on the end surfaces which are opposite to each other, a first transition layer 7 is arranged between the valve seat 2 and the corresponding wear-resistant layer 6, a second transition layer 8 is arranged between the valve plate 3 and the corresponding wear-resistant layer 6, the wear-resistant layer 6 is made of a cobalt-based alloy material, the first transition layer 7 and the second transition layer 8 are made of a nickel-based alloy material, the cobalt-based alloy material is made of stellite6 alloy, the stellite6 alloy is a cobalt-based alloy, is resistant to cavitation erosion, thermal shock and various corrosive media, is used for scouring and cavitation erosion, can prevent seizure, abrasion and scratching, has a low friction coefficient, can make sliding contact with other metals, and cannot make wear under most conditions, even if no lubricant is used or no lubricant is used, the stellite6 alloy can reduce seizure and wear to the minimum; the nickel-based alloy material is an Inconel625 alloy, the Inconel625 alloy is a solid solution strengthening type nickel-based deformation high-temperature alloy which takes molybdenum and niobium as main strengthening elements, has excellent corrosion resistance and oxidation resistance, has good tensile property and fatigue resistance from low temperature to 980 ℃, and resists stress corrosion in a salt spray atmosphere; wherein, adopt the Inconel625 alloy as the transition layer through 7 with first transition layers and 8 second transition layers and can effectual separation disk seat 2 and the diffusion of the wearing layer 6 that 3 parent Fe element of valve plate all set up on both to the transition layer, protect wearing layer 6, make the composition and the tissue of wearing layer 6 not change, can help controlling the hardness of wearing layer 6, effectively avoid the formation and the diffusion of harmful phase on wearing layer 6 under the high temperature simultaneously, prevent it and drop, improve the holistic life of gate valve, reduce after sale cost of maintenance.

Referring to fig. 2 and 3, when the first transition layer 7 and the wear-resistant layer 6 are sequentially arranged on the valve seat 2 body, and the second transition layer 8 and the wear-resistant layer 6 are sequentially arranged on the valve plate 3 body, a plasma spray welding technology is adopted, the plasma spray welding is a method of spraying and welding alloy powder on the metal surface by adopting a transfer plasma arc as a main heat source, before the plasma spray welding, the end surfaces of the valve seat 2 and the valve plate 3 are firstly cleaned, degreased and descaled, then the first filter layer 7 is welded on the valve seat 2 body, the second transition layer 8 is welded on the valve plate 3 body, at the moment, the thicknesses of the first transition layer 7 and the second transition layer 8 are both 1.25 mm-1.75 mm, after the first transition layer 7 is welded on the valve seat 2 body and the second transition layer 8 is welded on the valve plate 3 body, then the welding surfaces of the first transition layer 7 and the second transition layer 8 are processed, and PT (PT is called as coloring or as penetrant flaw detection, the method is a detection method which utilizes powerful penetrant to permeate into surface opening defects, then cleans off redundant penetrant on the surface, and then uses developer to suck out the penetrant to display defect traces. ) After PT flaw detection, the welding surfaces of the first transition layer 7 and the second transition layer 8 are ensured to have no cracks, then the wear-resistant layer 6 is respectively welded on the surfaces of the first transition layer and the second transition layer, after rough machining, PT flaw detection and PMI detection (PMI is named as Positive Material identification, spectral field detection, and spectral detection is to identify substances and determine the chemical composition and the relative content of the substances according to the spectrum of the substances. ) And the PMI detects that the content of Fe is less than or equal to 10 percent, the hardness detection reaches HV 380-HV 490, and the wear-resistant layer 6 arranged on the valve seat 2 and the valve plate 3 is finally processed and ground after no quality problem is ensured, so that the thickness of the wear-resistant layer 6 is not less than 2.5 mm.

In summary, the following steps: through adopting the Inconel625 alloy with first transition layer 7 and second transition layer 8 can be when the production build-up welding sealing surface, the wearing layer 6 diffusion of effectual separation disk seat 2 and 3 mother metal Fe elements of valve plate all setting up to both on, the iron element content of the final wearing layer 6 of control, can help controlling the hardness of wearing layer 6, guarantee the performance of wearing layer 6, simultaneously can be after the valve is put into use, effectively avoid wearing layer 6 under the high temperature respectively with disk seat 2, harmful looks's generation and diffusion on the 3 mother metal faying faces of valve plate, prevent it and drop, improve the holistic life of gate valve, reduce after-sale cost of maintenance.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, so as not to limit the protection scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims (3)

1. The utility model provides a parallel double-gate board gate valve, includes valve body, disk seat, valve plate, valve rod and valve gap, the disk seat sets up with the relative cooperation of valve plate, its characterized in that, all be provided with the wearing layer on disk seat and the relative complex terminal surface of valve plate, be provided with first transition layer between the terminal surface of disk seat and the wearing layer that corresponds rather than, be provided with the second transition layer between the terminal surface of valve plate and the wearing layer that corresponds, cobalt-based alloy material is chooseed for use to the wearing layer, nickel-based alloy material is all chooseed for use to first transition layer and second transition layer.

2. The parallel double gate valve of claim 1, wherein the wear resistant layer has a thickness of not less than 2.5 mm.

3. The parallel double gate plate gate valve of claim 1, wherein the first transition layer and the second transition layer each have a thickness of 1.25mm to 1.75 mm.

Images