A bidirectional hard-seal floating ball valve

Abstract

This utility model relates to the field of valves, and more particularly to a bidirectional hard-seal floating ball valve. It includes a valve body, a valve stem, and a ball. The valve body has a first flow hole and a second flow hole arranged along a horizontal first axis, corresponding to the upstream and downstream ends of a pipeline, respectively. The valve stem is arranged vertically and can rotate around its own vertical axis. The ball is disposed in a chamber between the first and second flow holes, with its center coinciding with the first axis. A flow hole is formed horizontally through the ball's center. The ball is fixed to the bottom end of the valve stem and rotates with the valve stem around the vertical axis, such that the axis of the flow hole has a different angle relative to the first axis. A sealing assembly is arranged on the valve body around the first axis. The sealing assembly includes a valve seat and an elastic element that drives the valve seat to contact the ball. The sealing assembly is provided at both ends of the ball corresponding to the first and second flow holes.

Description

Technical Field

[0001] This utility model relates to the field of valves, and in particular to a bidirectional hard-seal floating ball valve. Background Technology

[0002] Ball valves, as a common fluid control device, are widely used in petroleum, chemical, and pipeline transportation fields. They control the flow path by rotating a ball. Traditional floating ball valves typically employ a one-way sealing design, meaning that a sealing component is only installed at the downstream end of the ball. The valve seat is brought into contact with the ball by the medium pressure and the action of an elastic element to achieve a seal.

[0003] However, in actual working conditions, when the ball valve is in the closed state, if the downstream end accumulates pressure due to untimely pressure relief or medium backflow, the downstream pressure may exceed the sum of the upstream pressure and the elastic force, causing the downstream valve seat to lose contact with the ball, resulting in sealing failure and medium leakage. Utility Model Content

[0004] The purpose of this invention is to provide a bidirectional hard-seal floating ball valve to solve the problem that ball valves in the prior art are prone to failure under downstream pressure conditions.

[0005] The technical solution of this utility model is: a bidirectional hard-seal floating ball valve, comprising: The valve body has a first flow hole and a second flow hole arranged along a horizontal first axis, the first flow hole and the second flow hole corresponding to the upstream end and the downstream end of the pipe, respectively; The valve stem is set vertically and can rotate around its own vertical axis; A sphere is disposed in a chamber between a first flow orifice and a second flow orifice, with its center coinciding with the first axis. The sphere has a flow orifice horizontally formed through its center. The sphere is fixed to the bottom end of the valve stem and rotates with the valve stem around a vertical axis, so that the axis of the flow orifice has a different angle relative to the first axis. A sealing assembly is provided on the valve body around the first axis. The sealing assembly includes a valve seat and an elastic element that drives the valve seat to fit against the ball. The sealing assembly is provided at both ends of the sphere corresponding to the first flow hole and the second flow hole.

[0006] Preferably, the sealing assembly includes a protective mechanism, which includes a first protective ring and a second protective ring disposed at two ends corresponding to the deformation direction of the elastic element; The inner and outer walls of the first and second protective rings respectively abut against the valve seat and valve body, so that the elastic element is in an independent chamber that is not connected to the first orifice and the second orifice.

[0007] Preferably, the first protective ring is provided with a first retaining ring, and the second protective ring is provided with a second retaining ring; the first retaining ring is provided at the end of the first protective ring near the elastic member, and the second retaining ring is provided at the end of the second protective ring near the elastic member; the first protective ring and the second protective ring are indirectly connected to the elastic member through the first retaining ring and the second retaining ring, respectively.

[0008] Preferably, the valve seat has a first end face and a second end face, the elastic element is disposed between the first end face and the valve body, and the second end face is disposed at the end of the valve seat; when the second end face abuts against the valve body, there is an angle between the end face of the elastic element and the first end face.

[0009] Preferably, the first retaining ring and the second retaining ring are made of stainless steel.

[0010] Preferably, the elastic element is a disc spring.

[0011] Compared with the prior art, the advantages of this utility model are: (1) This application provides sealing components, including valve seats and elastic elements, at both ends of the ball corresponding to the first and second flow holes. This allows the valve seat to be tightly fitted to the ball by the elastic element when the ball valve is closed, regardless of whether the medium pressure comes from the upstream or downstream end. This effectively prevents sealing failure caused by excessive downstream pressure and improves the applicability and reliability of the ball valve.

[0012] (2) The protective mechanism in the sealing assembly includes a first protective ring and a second protective ring, whose inner and outer walls respectively abut against the valve seat and valve body, enclosing the elastic element in an independent chamber and isolating it from direct contact with the medium in the flow channel. This prevents particulate crystals from accumulating or clogging on the elastic element, ensuring that the elastic element can deform freely, maintaining a stable sealing force, and extending its service life.

[0013] (3) The valve seat is designed with a first end face and a second end face. The elastic element is set between the first end face and the valve body. When the second end face abuts against the valve body, there is an angle between the end face of the elastic element and the first end face. This ensures that the valve seat is limited before the elastic element is compressed to the maximum deformation, preventing the elastic element from being completely crushed, thereby avoiding sealing failure and component damage, and improving the safety and durability of the ball valve. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a cross-sectional view of a bidirectional hard-seal floating ball valve according to the present invention; Figure 2 This is a structural diagram of a bidirectional hard-seal floating ball valve according to the present invention; Figure 3 for Figure 1 Enlarged view of point A in the middle; Figure 4 This is a cross-sectional view of the valve seat described in this utility model; Wherein: 1. Valve body, 11. First flow hole, 12. Second flow hole, 2. Valve stem, 3. Ball, 31. Flow hole, 4. Sealing assembly, 41. Valve seat, 411. First end face, 412. Second end face, 42. Elastic element, 43. First protective ring, 44. Second protective ring, 45. First retaining ring, 46. Second retaining ring. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to specific embodiments: like Figure 1 and Figure 2 As shown, a bidirectional hard-seal floating ball valve includes a valve body 1, a valve stem 2, and a ball 3.

[0016] The valve body 1 has a first flow hole 11 and a second flow hole 12 at both ends for media flow. The valve stem 2 is vertically oriented and has a control device connected to its top end to drive it to rotate around its own axis. A ball 3 is disposed in the chamber between the first flow hole 11 and the second flow hole 12, and has a flow hole 31 at a position passing through its center. The top end of the ball 3 is threaded to the bottom end of the valve stem 2, and can adjust the axial direction of the flow hole 31 with the rotation of the valve stem 2, so that the axis of the flow hole 31 has a different rotation angle relative to the first axis, thereby controlling the opening degree of the first flow hole 11 and the second flow hole 12.

[0017] Combination Figure 3 As shown, a sealing assembly 4 is arranged around the first axis of the valve body 1. The sealing assembly 4 includes a valve seat 41 and an elastic element 42. When the valve stem 2 is rotated so that the axis of the flow hole 31 in the ball 3 is perpendicular to the first axis, the valve seat 41 abuts against the ball 3 under the drive of the elastic element 42, thereby blocking the first flow hole 11 by the ball 3. The elastic element 42 is a disc spring.

[0018] Normally, the pressure on the ball 3 comes from the first flow orifice 11, i.e., the upstream end of the pipeline. However, if the first flow orifice 11 is blocked and the pressure relief at the downstream end of the pipeline is not timely, the medium retained at the downstream end will also exert pressure on the ball 3. Furthermore, if the pressure on the ball 3 at the downstream end is greater than the sum of the pressure at the upstream end and the elastic force of the elastic element 42, the valve seat 41 located at the second flow orifice 12 will lose contact with the ball 3, thereby causing the ball valve to fail to seal.

[0019] To address this issue, this application provides a sealing component 4 at both ends of the sphere 3 corresponding to the first flow hole 11 and the second flow hole 12.

[0020] To prevent the accumulation of crystalline material on the elastic element 42 when the circulating medium contains particulate crystals, thus hindering the normal movement and deformation of the elastic element 42, in a preferred embodiment of this application, the sealing assembly 4 includes a protective mechanism. The protective mechanism has a first protective ring 43 and a second protective ring 44 disposed at two ends corresponding to the deformation direction of the elastic element 42. The inner and outer walls of the first protective ring 43 and the second protective ring 44 respectively abut against the valve seat 41 and the valve body 1, so that the elastic element 42 is located in an independent chamber that is not connected to the first flow hole 11 and the second flow hole 12.

[0021] In this embodiment, the first protective ring 43 and the second protective ring 44 are made of soft material. To ensure that the first protective ring 43 and the second protective ring 44 are subjected to uniform force, thereby increasing the sealing effect on the elastic element 42, a first retaining ring 45 is provided in conjunction with the first protective ring 43, and a second retaining ring 46 is provided in conjunction with the second protective ring 44. The first retaining ring 45 is located at the end of the first protective ring 43 near the elastic element 42, and the second retaining ring 46 is located at the end of the second protective ring 44 near the elastic element 42. The first protective ring 43 and the second protective ring 44 are indirectly connected to the elastic element 42 through the first retaining ring 45 and the second retaining ring 46, respectively. The first retaining ring 45 and the second retaining ring 46 are made of stainless steel.

[0022] As in 3 and Figure 4 As shown, in a preferred embodiment of this application, the valve seat 41 has a first end face 411 and a second end face 412. An elastic member 42 is disposed between the first end face 411 and the valve body 1. Figure 3 (The bolded portion in the middle) The second end face 412 is located at the end of the valve seat 41. The second end face 412 can abut against the valve body 1 before the elastic element 42 is compressed to its maximum deformation by the first end face 411, thereby avoiding the phenomenon of the elastic element 42 being completely crushed and causing sealing failure.

[0023] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and therefore, all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within this utility model.

Claims

1. A bidirectional hard-seal floating ball valve, characterized in that, include: The valve body (1) has a first flow hole (11) and a second flow hole (12) arranged along a horizontal first axis, the first flow hole (11) and the second flow hole (12) respectively corresponding to the upstream end and the downstream end of the pipeline; The valve stem (2) is set in the vertical direction and can rotate around its own vertical axis; A sphere (3) is disposed in the chamber between the first flow hole (11) and the second flow hole (12), and the center of the sphere is located in a position that coincides with the first axis. The sphere (3) has a flow hole (31) opened in the horizontal direction through its own center. The sphere (3) is fixed to the bottom end of the valve stem (2) and rotates with the valve stem (2) around the vertical axis, so that the axis of the flow hole (31) has a different angle relative to the first axis. A sealing assembly (4) is provided on the valve body (1) around the first axis. The sealing assembly (4) includes a valve seat (41) and an elastic element (42) that drives the valve seat (41) to fit against the ball (3). The sealing assembly (4) is provided at both ends of the sphere (3) corresponding to the first flow hole (11) and the second flow hole (12).

2. The bidirectional hard-seal floating ball valve according to claim 1, characterized in that, The sealing assembly (4) includes a protective mechanism, which includes a first protective ring (43) and a second protective ring (44) disposed at two ends corresponding to the deformation direction of the elastic element (42). The inner and outer walls of the first protective ring (43) and the second protective ring (44) respectively abut against the valve seat (41) and the valve body (1), so that the elastic element (42) is in an independent chamber that is not connected to the first flow hole (11) and the second flow hole (12).

3. A bidirectional hard-seal floating ball valve according to claim 2, characterized in that, A first retaining ring (45) is provided in conjunction with the first protective ring (43), and a second retaining ring (46) is provided in conjunction with the second protective ring (44); the first retaining ring (45) is provided at one end of the first protective ring (43) near the elastic member (42), and the second retaining ring (46) is provided at one end of the second protective ring (44) near the elastic member (42); the first protective ring (43) and the second protective ring (44) are indirectly connected to the elastic member (42) through the first retaining ring (45) and the second retaining ring (46) respectively.

4. A bidirectional hard-seal floating ball valve according to claim 3, characterized in that, The valve seat (41) has a first end face (411) and a second end face (412). The elastic element (42) is disposed between the first end face (411) and the valve body (1). The second end face (412) is disposed at the end of the valve seat (41). When the second end face (412) abuts against the valve body (1), there is an angle between the end face of the elastic element (42) and the first end face (411).

5. A bidirectional hard-seal floating ball valve according to claim 3, characterized in that, The first retaining ring (45) and the second retaining ring (46) are made of stainless steel.

6. A bidirectional hard-seal floating ball valve according to claim 1, characterized in that, The elastic element (42) is configured as a disc spring.

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