Valve plate assembly and valve suitable for high temperatures

Abstract

A valve plate assembly suitable for high temperatures, comprising a valve disc (1) and a valve disc ring (2), wherein the edge of one end face of the valve disc (1) along its axis is provided with a stepped slot, the valve disc ring (2) is located in the stepped slot, the valve disc ring (2) protrudes from a surface of the valve disc (1) in the axial direction of the valve disc (1), and the valve disc ring (2) is used for cooperating with a valve seat (34) in a valve; a plurality of first through holes (12) uniformly distributed along the circumferential direction of the stepped slot are provided at the position of the stepped slot of the valve disc (1); threaded holes are uniformly distributed on the back surface of the valve disc ring (2), and first bolts (6) penetrate through the first through holes and are connected to the threaded holes of the valve disc ring (2); a weld seam is formed by welding between an outer circumferential surface of the valve disc ring (2) and the valve disc (1) or between the surface of the valve disc ring (2) protruding from the valve disc (1) and the valve disc (1); and a stress relief groove (8) is provided on at least one side of the weld seam. The valve plate assembly can prevent the valve disc ring from falling off under high temperature or frequent opening and closing conditions, thus prolonging the service lifetime of the valve disc. Also disclosed is a valve comprising the valve plate assembly.

Description

Valve plate assembly and valve suitable for high temperature

[0001] The present application claims priority to the Chinese patent application No. 2024111010922, filed on August 12, 2024, and entitled "Valve plate assembly and valve suitable for high temperature", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of valves, and more particularly, to a valve plate assembly and valve suitable for high temperature. BACKGROUND

[0003] Gate valves are widely used in the chemical industry, such as ethylene chemical industry, coal chemical industry, petroleum chemical industry, etc.

[0004] At present, the valve plate of the gate valve mainly includes a whole valve plate and a split valve plate assembly, and the split valve plate assembly is divided into two categories: a welded valve plate assembly and a screwed valve plate assembly.

[0005] The defects of the whole valve plate mainly lie in that: when the valve plate size is large, it is difficult to form by integral casting, and the requirements for raw materials and foundry are high; when the valve plate size is large, it is difficult to weld the sealing surface and the wear-resistant surface, and deformation is easy to occur.

[0006] The defects of the welded valve plate assembly mainly lie in that: when welding the valve disc and the valve disc ring, the valve disc ring sealing surface is easy to deform; the welding stress is high, and there is a risk of cracking under high temperature and frequent operation conditions, which affects the service life of the valve plate.

[0007] The defects of the screwed valve plate assembly mainly lie in that: the valve disc ring and the valve disc are connected only by bolts, and after multiple opening and closing and vibration, the bolts are at risk of loosening; under high temperature and frequent operation conditions, the bolts are easy to break, affecting the service life of the valve plate; the sealing between the valve disc ring and the valve disc is not easy to guarantee.

[0008] Therefore, it is expected to develop a valve plate assembly. SUMMARY

[0009] The technical problem solved by the present application is to overcome the shortcomings of the prior art, and to provide a valve plate assembly and valve suitable for high temperature, which has low manufacturing difficulty, is not easy to deform, is suitable for high temperature conditions, and solves the problems of large size valve plate production difficulty, easy deformation and short service life under high temperature conditions.

[0010] The technical scheme provided by the present application is as follows:

[0011] In a first aspect, a valve plate assembly suitable for high temperature is provided, comprising a valve disc and a valve disc ring, the valve disc is provided with a stepped groove along an end face edge of its own axis, the valve disc ring is located in the stepped groove and protrudes from the surface of the valve disc in the axial direction of the valve disc, and the valve disc ring is used to cooperate with a valve seat in the valve;

[0012] The stepped groove of the valve disc is provided with a plurality of first through holes uniformly distributed along the circumferential direction of the stepped groove, the back surface of the valve disc ring is provided with threaded holes, and the first bolts pass through the first through holes and are connected with the threaded holes of the valve disc ring; the outer circumferential surface of the valve disc ring and the valve disc, or the surface of the valve disc ring protruding from the surface of the valve disc are welded to form a weld.

[0013] At least one side of the weld is provided with a slow-release groove, and the slow-release groove is opened on the surface of the valve disc ring or the valve disc, and the slow-release groove is a ring groove coaxial with the valve disc ring.

[0014] The slow-release groove is a U-shaped groove.

[0015] The surface of the valve disc ring protruding from the surface of the valve disc is a sealing surface, and the sealing surface is hard alloyed.

[0016] A second stop washer is arranged between the valve disc and the first bolt, the second stop washer is an outer tongue stop washer, the surface of the valve disc away from the valve disc ring is processed with a second blind hole, the second stop washer is an outer tongue stop washer, and the small anti-rotation piece of the second stop washer is clamped into the second blind hole to prevent the first bolt from rotating.

[0017] The opposite sides of the outer circumferential surface of the valve disc are respectively connected with guide strips, and the guide strips are used to cooperate with guide rails in the valve for guiding.

[0018] The opposite sides of the outer circumferential surface of the valve disc are provided with guide plates, the surface of the guide plate facing the surface of the valve disc ring is provided with a groove, the guide strip is located in the groove, a plurality of second through holes are arranged on the guide plate, and the second bolts pass through the second through holes and are threadedly connected with the guide strips.

[0019] The surface of the guide strip facing the surface of the valve disc ring is hard alloyed, and the hard alloyed surface of the guide strip is higher than the surface of the guide plate.

[0020] The guide plate and the second bolt are provided with a first stop washer, the guide plate is provided with a first blind hole on one side of the second through hole, the first stop washer is an outer tongue stop washer, and the small anti-rotation piece of the first stop washer extends into the first blind hole.

[0021] In a second aspect, a valve suitable for high temperature is provided, comprising a valve body, valve seats, guide rails, and the valve plate assembly of any one of the preceding aspects, the valve body is provided with a flow channel, along the flow channel axis direction, the valve body connects two opposite valve seats, two valve plate assemblies are arranged opposite to each other and located between the two valve seats, the valve rod is connected to the two valve plate assemblies, the valve rod is in sliding connection with the valve body, the guide rails are connected to the valve body, the guide rails are provided with two, the two guide rails are located on the side opposite to the valve plate assembly and are in sliding connection with the valve plate assembly, so that the valve rod drives the valve plate assembly to move along the direction perpendicular to the flow channel axis.

[0022] In summary, the present application has at least the following beneficial technical effects:

[0023] 1. The slow-release groove on the valve disc ring reduces the deformation of the sealing surface during welding.

[0024] 2. The slow-release groove on the valve disc ring reduces the welding stress and reduces the possibility of welding defects.

[0025] 3. The slow-release groove on the valve disc ring reduces the thermal stress of the valve disc ring and the welding seam under high temperature working conditions, effectively prevents the welding seam from cracking, and improves the service life under high temperature working conditions.

[0026] 4. The valve disc ring and the valve disc are fixed by bolts and sealed by welding, which not only reduces the stress of the welding seam, but also prevents the bolts from loosening and causing the valve disc ring to fall off. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a cross-sectional view of a valve plate assembly suitable for high temperature provided by an embodiment of the present application.

[0028] Figure 2 is an exploded view of a valve plate assembly suitable for high temperature provided by an embodiment of the present application.

[0029] Figure 3 is a partial view of a valve plate assembly suitable for high temperature provided by an embodiment of the present application.

[0030] Figure 4 is a valve disc structure diagram of a valve plate assembly suitable for high temperature provided by an embodiment of the present application.

[0031] Figure 5 is a structural schematic diagram II of a valve plate assembly suitable for high temperature provided by an embodiment of the present application.

[0032] Figure 6 is a structural schematic diagram III of a valve plate assembly suitable for high temperature provided by an embodiment of the present application.

[0033] Figure 7 is a structural schematic diagram IV of a valve plate assembly suitable for high temperature provided by an embodiment of the present application.

[0034] Figure 8 is a structural schematic diagram of a gate valve applied by an embodiment of the present application.

[0035] Explanation of reference signs: 1 - valve disc; 12 - first through hole; 13 - second blind hole; 6 - first bolt; 7 - second stop washer; 2 - valve disc ring; 11 - guide plate; 14 - second through hole; 15 - first blind hole; 5 - first stop washer; 4 - second bolt; 3 - guide strip; 8 - slow-release groove; 30 - gate assembly; 31 - valve body; 32 - flow passage; 33 - valve cavity; 34 - valve seat; 35 - support head; 36 - bottom cover; 37 - guide rail. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions and advantages of the present application clearer, the disclosed embodiments will be further described in detail below with reference to the drawings.

[0037] The embodiments of the present application disclose a valve plate assembly suitable for high temperature, as shown in FIG. 1, which is a sectional view of a valve plate assembly provided by the embodiments of the present application. The valve plate assembly comprises a valve disc 1 and a valve disc ring 2. The valve disc ring 2 is fixed to one side of the valve disc 1 and is used to tightly fit the valve seat 34 arranged inside the flow passage 32. When the valve is closed, the valve plate assembly is blocked, the valve disc ring 2 and the valve seat 34 arranged inside the flow passage 32 are tightly fitted to realize the sealing of the valve. The valve disc 1 adopts an integral casting structure, such as an integral casting stainless steel. The back of the valve disc ring 2 is uniformly provided with threaded holes, and the valve disc ring 2 and the valve disc 1 are connected through the first bolt 6. The first bolt 6 is a hexagonal head bolt. The front of the valve disc 1 is provided with guide strips 3, the back of the guide strips 3 is uniformly provided with threaded holes, and the guide strips 3 and the valve disc 1 are connected through the second bolt 4, which is a hexagonal head bolt.

[0038] As shown in FIG. 1 and FIG. 2, the sealing surface of the valve disc ring 2 is welded with hard alloy to prevent the valve disc ring 2 and the valve seat 34 from rubbing and causing the sealing surface to wear when the valve disc is closed, thereby causing sealing failure. The sealing surface of the valve disc ring 2 is higher than the end surface of the valve disc 1, so as to ensure that the sealing surface of the valve disc ring 2 is fitted to the valve seat 34 when closed.

[0039] As shown in FIG. 3 and FIG. 4, the front of the valve disc 1 is processed with a stepped surface, and the stepped surface is uniformly processed with first through holes 12. The back of the valve disc ring 2 is processed with uniformly distributed threaded holes, and the threaded holes of the valve disc ring 2 and the first through holes 12 of the valve disc 1 are one-to-one corresponding.

[0040] The first bolt 6 is screwed through the first through hole 12 of the valve disc 1 and the threaded hole of the valve disc ring 2 to fix the valve disc 1 and the valve disc ring 2.

[0041] The inside of the first through hole 12 of the back of the valve disc 1 is processed with a second blind hole 13, and the second stop washer 7 is arranged between the valve disc 1 and the first bolt 6. The second stop washer 7 is an outer tongue stop washer, a small anti-rotation piece extends into the second blind hole 13, and the back is vertically erected to prevent the first bolt 6 from rotating and causing the valve disc ring 2 to fall off.

[0042] The valve disc ring 2 is provided with a slow-release groove on the inner side of the front face and the lower part of the outer circle, and the right angle position of the stepped face of the valve disc 1 is chamfered, and the edge of the inner side of the valve disc ring 2 and the stepped face is chamfered, so that the valve disc ring 2 does not interfere with the valve disc 1, and the installation stress is small. The gap between the valve disc ring 2 and the valve disc 1 is sealed by welding, so that when the valve is closed, no gas or liquid flows between the valve cavity 33 and the flow passage 32. The slow-release groove reduces the deformation of the sealing surface during welding, reduces the welding stress, reduces the possibility of defects in the welding seam, prevents the welding seam from cracking, and at the same time reduces the deformation of the sealing surface of the valve disc ring 2. Under high temperature working conditions, the slow-release groove reduces the internal thermal stress of the welding seam, which is not easy to crack, cooperates with the tightening effect of the first bolt 6, greatly reduces the possibility of the valve disc ring falling off, and prolongs the service life of the valve plate assembly 30. According to simulation calculation, the stress at the welding seam is reduced by about 20%.

[0043] The valve disc ring 2 and the valve disc 1 have two gaps, at least one of the two gaps is sealed by welding to form a welding seam, and at least one side of the welding seam is provided with a slow-release groove, that is, the slow-release groove is located on the valve disc ring 2 or the valve disc 1. The slow-release groove is a ring groove coaxial with the valve disc ring 2, and the cross-sectional edge shape of the slow-release groove is arc-shaped or linearly transitions through an arc, and preferably, the slow-release groove is a U-shaped groove.

[0044] In some embodiments, as shown in FIG. 5, the valve disc ring 2 is provided with a slow-release groove on the inner side of the front face, and the gap between the valve disc ring 2 and the valve disc 1 is sealed by a welding seam on the inner side of the slow-release groove, and at the same time, the valve disc ring 1 and the valve disc 1 are fixed by the first bolt 6, and the first bolt 6 and the valve disc 1 are provided with the second stop washer 7 to prevent the first bolt 6 from rotating.

[0045] In some embodiments, as shown in FIG. 6, the valve disc ring 2 is provided with a slow-release groove on the inner side of the front face and the root of the outer circle, and the gap between the valve disc ring 2 and the valve disc 1 is sealed by two welding seams.

[0046] In some embodiments, as shown in FIG. 7, the valve disc ring 2 is provided with a slow-release groove at the root of the outer circle, and the valve disc 1 is provided with a slow-release groove on the outer side of the front face, and the gap between the valve disc ring 2 and the valve disc 1 is sealed by a welding seam at the root of the slow-release groove, and at the same time, the valve disc ring 1 and the valve disc 1 are fixed by the first bolt 6, and the first bolt 6 and the valve disc 1 are provided with the first stop washer 5 to prevent the first bolt 6 from rotating.

[0047] As shown in FIGS. 1-4 and 8, during the opening and closing process of the valve, the valve disc 1 has guide plates 11 on both sides, and the guide plates 11 and the valve body 31 have friction at both sides, so the guide plates 11 are provided with guide strips 3, and the valve body 31 is provided with guide rails 37. The back of the guide strip 3 is uniformly provided with threaded holes, and the guide strip 3 and the valve disc 1 are connected by hexagonal head bolts 8.

[0048] The second bolt 4 passes through the second through hole 14 of the guide plate 11 and is tightened with the threaded hole of the guide strip 3 to fix the valve disc 1 and the guide strip 3.

[0049] The first blind hole 15 is processed inside the second through hole 14 on the back of the guide plate 11, the first stop washer 5 is arranged between the guide plate 11 and the second bolt 4, the first stop washer 5 is an outer tongue stop washer, the small anti-rotation piece extends into the first blind hole 15, the back is erected, and the second bolt 4 is prevented from rotating to cause the guide strip 3 to fall off.

[0050] Hard alloy is built up on the front of the guide strip 3, the built-up surface is higher than the end surface of the guide plate 11, hard alloy is built up on the guide rail 37, in the switching process, the built-up surfaces of the guide strip 3 and the guide rail 37 rub, the built-up surface has high hardness, and it is ensured that the rubbing surface is not easy to wear in the use process.

[0051] As shown in FIG. 8, the head of the valve disc 1 is hardened, in order to prevent excessive displacement of the gate assembly due to inertia when the valve is closed, excessive friction of the sealing surface, and difficulty in opening, the head of the bottom cover 36 is provided with a support head 35, the surface of the support head 35 is hardened. The support head 35 collides with the head of the valve disc 1, and the excessive displacement of the gate assembly is limited.

[0052] As shown in FIGS. 2-6, the valve disc ring 2 and the slow-release groove of the valve disc 1 are 5 mm in size and 5 mm in depth, and the bottom is circular.

[0053] The embodiment also discloses a valve suitable for high temperature, as shown in FIG. 8, comprising a valve body 31, a valve seat 34, a guide rail 37, and a valve plate assembly 30, the valve body 31 is provided with a flow channel 32 and a valve cavity 33, along the axis direction of the flow channel 32, the valve body 31 is connected with two opposite valve seats 34, the two valve seats 34 cut off the flow channel 32, two valve plate assemblies are arranged away from each other and located between the two valve seats 34, a valve rod is installed between the two valve plate assemblies 30, the valve rod is in sliding connection with the valve body 31, the guide rail 37 is connected in the valve cavity 33 of the valve body 31, two guide rails 37 are arranged, the two guide rails 37 are located on the sides away from each other of the valve plate assembly and are in sliding connection with the guide strip 3 of the valve plate assembly, so that the valve rod drives the valve plate assembly 30 to move along the direction perpendicular to the axis of the flow channel 32.

[0054] The bottom cover 36 is installed on the side away from the guide rail 37 of the valve body 31, the head of the bottom cover 36 is provided with a support head 35 towards the flow channel 32, the surface of the support head 35 is hardened, the head of the valve disc 1 is away from the valve rod along the axis direction of the valve rod, the head of the valve disc 1 is hardened. When the valve rod drives the valve plate assembly 30 to move, the head of the valve plate assembly 30 contacts the support head 35, the valve plate assembly 30 cannot continue to move, at this time, the valve disc ring 2 of the valve plate assembly 30 is opposite to and contacts the valve seat 34, at this time, the valve disc 1 just blocks the flow channel 32.

[0055] The contents not described in detail in the specification belong to the known technology of those skilled in the art.

[0056] The application has been described in detail with specific reference to particular embodiments and exemplified examples, but it will be understood that these are only examples and are not intended to limit the application, as the application can be modified in various equivalent and / or functional ways and can be implemented in various examples. It will be appreciated that those skilled in the art will be able to devise numerous alternative arrangements and procedures for carrying out the application without departing from the spirit and scope of the application. The scope of the application is not to be limited by the specific examples given.

Claims

1. A valve plate assembly suitable for high temperatures, characterized by: The valve disc (1) and the valve disc ring (2) are provided with a stepped groove along one end face edge of the valve disc (1), and the valve disc ring (2) is located in the stepped groove and protrudes from the surface of the valve disc (1) in the axial direction of the valve disc (1), and the valve disc ring (2) is used in cooperation with the valve seat (34) in the valve; the stepped groove of the valve disc (1) is provided with a plurality of first through holes (12) uniformly distributed along the circumferential direction of the stepped groove, and the back surface of the valve disc ring (2) is provided with threaded holes, and the first bolt (6) is connected with the threaded holes of the valve disc ring (2) through the first through holes; the outer circumferential surface of the valve disc ring (2) and the surface of the valve disc (1) are welded to form a weld.

2. A valve plate assembly suitable for high temperatures according to claim 1, characterized in that: At least one side of the weld is provided with a slow-release groove (8), and the slow-release groove (8) is opened on the surface of the valve disc ring (2) or the valve disc (1), and the slow-release groove is a ring groove coaxial with the valve disc ring (2).

3. A valve plate assembly suitable for high temperatures according to claim 2, characterized in that: The slow-release groove is a U-shaped groove.

4. A valve plate assembly suitable for high temperatures according to claim 1, characterized in that: The surface of the valve disc ring (2) protruding from the surface of the valve disc (1) is a sealing surface, and the sealing surface is hard alloyed.

5. A valve plate assembly suitable for high temperatures according to claim 1, characterized in that: The second stop washer (7) is provided between the valve disc (1) and the first bolt (6), the second stop washer (7) is an outer tongue stop washer, the surface of the valve disc (1) away from the valve disc ring (2) is processed with a second blind hole (13), the second stop washer (7) is an outer tongue stop washer, and the small anti-rotation piece of the second stop washer (7) is clamped into the second blind hole (13) to prevent the first bolt (6) from rotating.

6. A valve plate assembly suitable for high temperatures according to claim 1, characterized in that: The opposite sides of the outer circumferential surface of the valve disc (1) are respectively connected with guide strips (3), and the guide strips (3) are used for cooperation with the guide rails (37) in the valve for guiding.

7. A valve plate assembly suitable for high temperatures according to claim 6, characterized in that: The opposite sides of the outer circumferential surface of the valve disc (1) are provided with guide plates (11), and the surface of the guide plate (11) facing the surface of the valve disc ring (2) is provided with a groove, and the guide strip (3) is located in the groove, and the guide plate (11) is provided with a plurality of second through holes (14), and the second bolt (4) passes through the second through hole (14) and is threadedly connected with the guide strip (3).

8. A valve plate assembly suitable for high temperatures according to claim 6, characterized in that: The surface of the guide strip (3) facing the surface of the valve disc ring (2) is hard alloyed, and the hard alloyed surface of the guide strip (3) is higher than the surface of the guide plate (11).

9. A valve plate assembly suitable for high temperatures according to claim 7, characterized in that: The first stop washer (5) is provided between the guide plate (11) and the second bolt (4), the first blind hole (15) is provided on one side of the second through hole of the guide plate (11), the first stop washer (5) is an outer tongue stop washer, and the small anti-rotation piece of the first stop washer (5) extends into the first blind hole (15).

10. A valve suitable for high temperatures, characterized in that: The valve body (31) is provided with a flow channel (32), along the axial direction of the flow channel (32), the valve body (31) is connected with two opposite valve seats (34), two valve plate assemblies are arranged away from each other and located between the two valve seats (34), the two valve plate assemblies are connected with a valve rod, the valve rod is in sliding connection with the valve body (31), the guide rails (37) are connected to the valve body (31), the guide rails (37) are provided with two, the two guide rails (37) are respectively located on the sides away from each other of the valve plate assemblies and are in sliding connection with the valve plate assemblies, so that the valve rod drives the valve plate assemblies to move along the direction perpendicular to the axial direction of the flow channel (32).

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