Double-ball plate valve

Abstract

The invention discloses a double-ball plate valve, relates to the technical field of butterfly valve control, and solves the technical problems that a butterfly valve is large in friction coefficient, large in abrasion, large in torsion, difficult to maintain, not firm enough in sealing or high in cost of maintaining and replacing accessories during use. A left valve seat and a right valve seat are detachably connected with a valve body respectively, a left sealing installation groove and a right sealing installation groove are formed in the left valve seat and the right valve seat respectively, and closing and sealing of the valve are achieved through elastic extrusion of a left ball plate and a left sealing ring and elastic extrusion of a right ball plate and a right sealing ring. The left valve seat, the left sealing ring, the right valve seat and the right sealing ring have high self-compensation elasticity, the left sealing ring and the right sealing ring are matched with the left ball plate and the right ball plate of the valve element, and the effects of double-plate spherical surface low-abrasion extrusion sealing and valve seat elastic self-compensation are achieved. And due to the design of the sealing structure, the sealing reliability is improved, maintenance is facilitated, and maintenance materials are saved.

Description

Technical Field

[0001] The invention relates to the technical field of butterfly valve manufacturing, in particular to a double-spherical surface and double-ball plate valve. Background Art

[0002] Existing eccentric butterfly valves use a disc with a certain eccentric angle to squeeze and seal against the valve seat, and the valve seat lacks elastic self-compensation. Internally, there is only one disc and one seat for sealing. Existing eccentric butterfly valves cannot achieve the dual sealing effect of dual seats, resulting in poor sealing reliability. Due to the forced squeeze seal, manufacturing is difficult and costly, especially during maintenance, as it is difficult to repair and replace parts, resulting in high maintenance and update costs. Summary of the Invention

[0003] The present invention provides a double-spherical double-ball plate valve, one of the technical problems it aims to solve is that the existing butterfly valve is inconvenient to repair, the cost of replacing accessories is high, and it has only one valve plate and one valve seat, and the sealing is not reliable enough.

[0004] In view of the above problems in the prior art, according to one aspect disclosed in the present invention, the present invention adopts the following technical solution:

[0005] A double ball plate valve, comprising:

[0006] Valve body;

[0007] An upper valve stem and a lower valve stem, wherein the upper valve stem and the lower valve stem are respectively connected to the upper and lower parts of the valve body;

[0008] A valve core is located in the valve body, the upper and lower sides of the valve core are connected to the upper valve stem and the lower valve stem respectively, and the valve core includes a left ball plate located on the left side and a right ball plate located on the right side;

[0009] a left valve seat and a right valve seat, the left valve seat and the right valve seat being detachably connected to the valve body, respectively, and a left sealing mounting groove and a right sealing mounting groove being respectively provided on the left valve seat and the right valve seat, the left sealing mounting groove being located outside the circumferential edge of the left ball plate in a closed state, and the right sealing mounting groove being located outside the circumferential edge of the right ball plate in a closed state;

[0010] A left sealing ring and a right sealing ring, wherein the left sealing ring is installed in the left sealing installation groove, and the right sealing ring is installed in the right sealing installation groove; the closing and sealing of the valve is achieved by elastic extrusion between the left ball plate and the left sealing ring, and between the right ball plate and the right sealing ring.

[0011] In order to better implement the present invention, a further technical solution is:

[0012] Furthermore, the side surface of the left valve seat is fixedly connected to the left side of the valve body by screws through threaded connection.

[0013] Furthermore, the side surface of the right valve seat is fixedly connected to the right side of the valve body by screws through threaded connection.

[0014] Furthermore, the upper end of the upper valve stem is connected to an actuator.

[0015] Furthermore, the left sealing ring is one of an O-ring, a Y-ring, a V-ring, a U-ring, an L-ring, a T-ring and a rectangular ring.

[0016] Furthermore, the right sealing ring is one of an O-ring, a Y-ring, a V-ring, a U-ring, an L-ring, a T-ring and a rectangular ring.

[0017] Furthermore, a lower plug is provided below the lower valve stem, and the lower plug and the lower valve stem are an integrated structure, and the integrated structure is screwed into the valve body by means of threads, and the lower valve stem is detachably connected to the valve core.

[0018] Compared with the prior art, one of the beneficial effects of the present invention is:

[0019] The present invention solves the problems of the existing butterfly valves, such as short service life, weak sealing, large friction coefficient, large wear, large torque, inconvenient maintenance or short service life after maintenance, and the existing butterfly valves having only one valve plate and one valve seat, and unreliable sealing. The left and right spherical valve plates designed by the present invention are precisely matched with the corresponding valve seat sealing structures, so that the wear of the valve seats at both ends is reduced to a minimum, and the valve seat has an elastic self-compensating effect. It cooperates with the left and right double-plate spherical surfaces of the valve core at a certain angle to form a double-plate spherical surface low-wear extrusion seal and valve seat elastic self-compensating effect mechanism, which has the effects of safe and reliable sealing and automatic wear compensation; it is suitable for long-term maintenance-free use of pipelines. The structural design of the sealing valve seat is not only convenient for assembly, but also convenient for replacement during maintenance, and saves replacement materials; the sealing material can be made of high-quality anti-aging, wear-resistant and durable materials, thereby improving the sealing effect and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of this application document or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the description of the embodiments or the prior art. Obviously, the drawings described below are only references to some embodiments in this application document. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 Schematic diagram of the structure of a double ball plate valve according to an embodiment of the present invention.

[0022] Figure 2Schematic diagram of the structure of a double ball plate valve according to another embodiment of the present invention.

[0023] In the accompanying drawings, the corresponding figures are as follows:

[0024] 1-valve body, 2-valve core, 3-upper valve stem, 4-lower valve stem, 5-left ball plate, 6-right ball plate, 7-left valve seat, 8-right valve seat, 9-left sealing ring, 10-right sealing ring, 11-left sealing installation groove, 12-right sealing installation groove, 13-upper sealing fireproof ring, 14-first upper sealing ring, 15-second upper sealing ring, 16-upper pressure cover, 17-lower sealing fireproof ring, 18-first lower sealing ring, 19-second lower sealing ring, 20-lower plug. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the examples, but the embodiments of the present invention are not limited thereto.

[0026] See also Figure 1 As shown, a double ball plate valve, its specific structure includes a valve body 1, an upper valve stem 3, a lower valve stem 4, a valve core 2, a left valve seat 7, a right valve seat 8, a left sealing ring 9 and a right sealing ring 10; the upper valve stem 3 and the lower valve stem 4 are respectively connected to the upper and lower parts of the valve body 1; the valve core 2 is located in the valve body 1, and the upper and lower sides of the valve core 2 are respectively connected to the upper valve stem 3 and the lower valve stem 4, and the valve core 2 includes a left ball plate 5 located on the left and a right ball plate 6 located on the right; the left valve seat 7 and the right valve seat 8 are respectively detachably connected to the valve body 1, and the left valve A left sealing mounting groove 11 and a right sealing mounting groove 12 are respectively provided on the seat 7 and the right valve seat 8. The left sealing mounting groove 11 is located outside the circumferential edge of the left ball plate 5 in a closed state, and the right sealing mounting groove 12 is located outside the circumferential edge of the right ball plate 6 in a closed state; the left sealing ring 9 is installed in the left sealing mounting groove 11, and the right sealing ring 10 is installed in the right sealing mounting groove 12; the valve closing seal is achieved by the elastic extrusion of the left ball plate 5 and the left sealing ring 9, and the right ball plate 6 and the right sealing ring 10.

[0027] The side of the left valve seat 7 is preferably fixedly connected to the left side of the valve body 1 by screws, and the side of the right valve seat 8 is fixedly connected to the right side of the valve body 1 by screws, that is, a detachable connection is achieved, which is convenient for subsequent maintenance.

[0028] The upper end of the upper valve stem 3 is connected to an actuator, which can be any type of mechanism. The upper valve stem 3 is rotated by the actuator at the top of the upper valve stem 3, linking the valve core 2 and the lower valve stem 4 to achieve the purpose of opening and closing the valve core 2 for flow or regulation.

[0029] The left sealing ring 9 and the right sealing ring 10 are preferably O-rings. Of course, the sealing ring of the present invention is not limited to O-rings, and can also be other forms of elastic sealing rings, such as Y-rings, V-rings, U-rings, L-rings, T-rings and rectangular rings.

[0030] The left sealing ring 9 and the right sealing ring 10 are fixed, and the contact tracks of the left ball plate 5 and the left sealing ring 9, and the contact tracks of the right ball plate 6 and the right sealing ring 10 are on the spherical surface, thereby ensuring the sealing effect.

[0031] A stuffing chamber is provided between the end of the valve body 1 and the middle part of the upper valve stem 3. An upper sealing fire ring 13, a first upper sealing ring 14 and a second upper sealing ring 15 are provided between the upper valve stem 3 and the valve body 1. The seal is secured by an upper pressure cover 16. A connecting plate for installing an actuator is provided at the top (not shown in the figure). Electric, pneumatic, manual and other actuators can be installed to control the upper valve stem 3 to drive the movement of the double-spherical double-sealed valve core to achieve the function of switching or regulating.

[0032] A lower packing chamber is also provided at the lower end of the valve body 2. A lower sealing fire ring 17, a first lower sealing ring 18 and a second lower sealing ring 19 are provided between the lower valve stem 4 and the valve body 2, and a lower plug 20 is used to tighten and stabilize the seal.

[0033] The connection between the valve body 1 and the pipeline can be flange type, welding type, clamp type or other connection methods.

[0034] See also Figure 2 As shown, Figure 2 Another embodiment of a double-ball valve is shown. In this embodiment, the lower plug 20 and the lower valve stem 4 are integrally formed, threaded into the valve body 1. The lower valve stem 4 is not welded to the valve core 2, but merely maintains contact. A gasket can be placed between the lower valve stem 4 and the valve core 2 to further facilitate rotation of the valve core 2. This arrangement provides a simpler installation structure and easier maintenance. This embodiment is particularly suitable for use with small-diameter valves.

[0035] In summary, the double ball plate valve of the present invention solves the technical problems that the butterfly valve has a large friction coefficient, high wear and a short service life, high torque, is difficult to repair, or the cost of repairing and replacing accessories is high during use, and the existing butterfly valve has only one valve plate and one valve seat, and the sealing is not reliable enough; in the present invention, the left valve seat 7 and the left sealing ring 9, the right valve seat 8 and the right sealing ring 10 have high self-compensating elasticity, and the left sealing ring 9 and the right sealing ring 10 cooperate with the left ball plate 5 and the right ball plate 6 of the valve core 2 to achieve the effect of low wear extrusion sealing of the double-plate spherical surface and elastic self-compensation of the valve seat. The design of its sealing structure facilitates maintenance and saves maintenance materials.

[0036] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0037] References in this specification to "one embodiment," "another embodiment," "an embodiment," etc., refer to specific features, structures, or characteristics described in conjunction with that embodiment as included in at least one embodiment generally described herein. The appearance of the same term in multiple places in this specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in conjunction with any embodiment, it is intended that such feature, structure, or characteristic, when implemented in conjunction with other embodiments, also fall within the scope of the present invention.

[0038] Although the present invention has been described herein with reference to a number of illustrative embodiments thereof, it will be understood that numerous other modifications and implementations may be devised by those skilled in the art that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure and claims, numerous variations and improvements may be made to the components and / or layout of the subject combination arrangement. In addition to variations and improvements made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A double ball valve, characterized in that include: Valve body (1); An upper valve stem (3) and a lower valve stem (4), wherein the upper valve stem (3) and the lower valve stem (4) are respectively connected to the upper and lower parts of the valve body (1); A valve core (2), the valve core (2) is located in the valve body (1), the upper and lower sides of the valve core (2) are connected to the upper valve stem (3) and the lower valve stem (4) respectively, and the valve core (2) includes a left ball plate (5) located on the left side and a right ball plate (6) located on the right side; A left valve seat (7) and a right valve seat (8), the left valve seat (7) and the right valve seat (8) are respectively detachably connected to the valve body (1), and a left sealing installation groove (11) and a right sealing installation groove (12) are respectively provided on the left valve seat (7) and the right valve seat (8), the left sealing installation groove (11) is located outside the circumferential edge of the left ball plate (5) in a closed state, and the right sealing installation groove (12) is located outside the circumferential edge of the right ball plate (6) in a closed state; A left sealing ring (9) and a right sealing ring (10), wherein the left sealing ring (9) is installed in the left sealing installation groove (11), and the right sealing ring (10) is installed in the right sealing installation groove (12); the valve is closed and sealed by elastic extrusion between the left ball plate (5) and the left sealing ring (9), and the right ball plate (6) and the right sealing ring (10).

2. The double ball valve according to claim 1, characterized in that The side surface of the left valve seat (7) is fixedly connected to the left side of the valve body (1) by screws through a threaded connection.

3. The double ball valve according to claim 1, characterized in that The side surface of the right valve seat (8) is fixedly connected to the right side of the valve body (1) by screws through a threaded connection.

4. The double ball valve according to claim 1, characterized in that The upper end of the upper valve stem (3) is connected to the actuator.

5. The double-spherical double-ball plate valve according to claim 1, characterized in that The left sealing ring (9) is one of an O-ring, a Y-ring, a V-ring, a U-ring, an L-ring, a T-ring and a rectangular ring.

6. The double-spherical double-ball plate valve according to claim 1, characterized in that The right sealing ring (10) is one of an O-ring, a Y-ring, a V-ring, a U-ring, an L-ring, a T-ring and a rectangular ring.

7. The double-spherical double-ball plate valve according to claim 1, characterized in that Also includes: A lower plug (20) is provided below the lower valve stem (4); the lower plug (20) and the lower valve stem (4) are an integrated structure, the integrated structure is screwed into the valve body (1) by means of a thread, and the lower valve stem (4) is detachably connected to the valve core (2).

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