Floating type ball valve

Abstract

The utility model is applicable to the field of valve equipment, and provides a floating ball valve which comprises a first valve body, a second valve body, a control ball body and a control valve rod, valve seats are respectively arranged on flow channels of the first valve body and the second valve body, each valve seat is provided with a sealing ring mounting groove, and a ball body sealing ring is elastically arranged in each sealing ring mounting groove. The control ball body is arranged between the two valve seats in the main flow channel and is in sealing sliding connection with the two valve seats, the control ball body is provided with a ball body through hole and two sealing ring embedding grooves matched with the ball body sealing rings, and when the valve body is in a completely closed state, the sealing ring embedding grooves of the control ball body just rotate to be parallel to the central axis of the main flow channel; at the moment, the ball body sealing ring can be just popped out under the action of the elastic piece and is embedded into the sealing ring embedding groove, so that the sealing performance between the control ball body and the valve seat is improved, and under other conditions, the ball body sealing ring can be extruded and compressed into the sealing ring mounting groove so as to reduce the rotating resistance of the control ball body.

Description

Technical Field

[0001] The utility model is applicable to the field of valve equipment and provides a floating ball valve. Background Art

[0002] A ball valve is a valve that uses a spherical closing member. The spherical closing member is driven by a valve stem to rotate in the valve body flow passage. By rotating the spherical closing member, the regulation and control of the flow passage fluid can be achieved. The sphere of a floating ball valve is floating. Under the action of the medium pressure, the sphere can produce a certain displacement and tightly press on the valve seat sealing surface at the outlet end to ensure the sealing of the outlet end. However, during long-term use of such a floating sphere, the valve seat sealing surface will be worn, resulting in poor sealing. In the initial structure, since the relative gap between the floating sphere and the valve seat sealing surface is extremely small, adding structures such as sealing rings between the two will cause difficulty in the rotation of the sphere. Summary of the Utility Model

[0003] Therefore, the utility model provides a floating ball valve. By providing an elastically telescopic sphere sealing ring on the valve seat and a sealing ring embedding groove adapted to the sphere sealing ring on the control sphere, when the control sphere rotates to the position where the valve body is completely closed, the sphere sealing ring just fits into the sealing ring embedding groove, increasing the sealing performance between the control sphere and the valve seat.

[0004] To achieve the above object, the utility model provides the following technical solution: A floating ball valve, comprising:

[0005] A first valve body for installing each component. A first flow passage for the medium to flow through is provided in the first valve body. A valve stem mounting hole is provided on the side of the first valve body, and the valve stem mounting hole communicates with the first flow passage;

[0006] A second valve body fixedly connected to the first valve body. A second flow passage for the medium to flow through is provided in the second valve body, and the second flow passage communicates with the first flow passage to jointly form a main flow passage;

[0007] Two valve seats are respectively arranged in the first flow passage and the second flow passage. The valve seat is provided with a sealing ring mounting groove, and a sphere sealing ring is slidably arranged in the sealing ring mounting groove. The sphere sealing ring is elastically connected to the bottom of the sealing ring mounting groove through an elastic body;

[0008] A control sphere is arranged in the main flow passage and is slidably and tightly connected to the two valve seats respectively. The control sphere is provided with a sphere through hole and two sealing ring embedding grooves, and the two sealing ring embedding grooves are respectively adapted to the two sphere sealing rings;

[0009] The control valve stem is rotatably arranged in the valve stem mounting hole. Both ends of the control valve stem are respectively arranged outside the first valve body and in the main flow channel. One end of the control valve stem located in the main flow channel is fixedly connected to the control sphere.

[0010] Furthermore, the central axes of the two seal ring embedding grooves are both perpendicular to the central axis of the sphere through-hole.

[0011] Furthermore, the valve seat is made of polytetrafluoroethylene material, and the sphere seal ring is made of rubber material.

[0012] Furthermore, a packing groove is arranged between the upper part of the valve stem mounting hole and the control valve stem. The packing groove is filled with sealing packing. A packing pressing plate is fixedly arranged at the upper end of the packing groove, and the packing pressing plate is used to seal the upper notch of the packing groove.

[0013] Furthermore, anti-static beads are elastically connected to the outer side wall of the control valve stem, and the anti-static beads are in sliding contact with the inner side wall of the valve stem mounting hole.

[0014] Furthermore, one end of the control valve stem located outside the first valve body is fixedly connected with an operating handle.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] 1. In the solution of the present utility model, by respectively arranging an elastically telescopic sphere seal ring on the valve seats of the two valve bodies, and then arranging two seal ring embedding grooves adapted to the sphere seal ring on the outer side wall of the control sphere, only when the control sphere rotates to the angle where the valve body is completely closed, the sphere seal ring will just be embedded into the seal ring embedding groove, so as to improve the sealing performance between the valve seat and the control sphere. When the control sphere rotates to other angles, the sphere seal ring will retract into the valve body to ensure the smooth rotation of the control sphere, and at the same time, it can also protect the sphere seal ring from excessive wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is an internal schematic diagram of a floating ball valve mentioned in the present utility model in a completely closed state;

[0018] Figure 2 is Figure 1 a partial enlarged schematic diagram of part A in

[0019] Figure 3 is an internal schematic diagram of a floating ball valve mentioned in the present utility model in a completely open state with the maximum flow rate;

[0020] Figure 4 is Figure 3 a partial enlarged schematic diagram of part B in

[0021] Figure 5 This is a schematic structural diagram of the control sphere mentioned in the present utility model.

[0022] In the figure: 1, the first valve body; 11, the first flow channel; 2, the second valve body; 21, the second flow channel; 3, the control sphere; 31, the sphere through-hole; 32, the sealing ring embedding groove; 4, the control valve stem; 5, the operating handle; 6, the sealing packing; 7, the packing pressing plate; 8, the valve seat; 81, the sphere sealing ring; 82, the elastomer; 9, the anti-static bead. Specific embodiments

[0023] The following describes the preferred embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present utility model and are not used to limit the present utility model.

[0024] Embodiment 1. Referring to Figure 1 and Figure 3 , a floating ball valve provided by the present utility model includes a first valve body 1, a second valve body 2, a control sphere 3 and a control valve stem 4. The first valve body 1 is used to connect each component. A first flow channel 11 for the medium to flow through is provided in the first valve body 1. The second valve body 2 is fixedly connected to the first valve body 1 by means of a bolt mechanism or the like. Generally, a sealing ring or the like can be used to seal the connection position between the second valve body 2 and the first valve body 1. A second flow channel 21 for the medium to flow through is provided in the second valve body 2. The second flow channel 21 communicates with the first flow channel 11 to jointly form a main flow channel. A valve seat 8 is respectively provided in the first flow channel 11 and the second flow channel 21. The valve seat 8 is provided with a sealing ring installation groove. A sphere sealing ring 81 is slidably provided in the sealing ring installation groove. The valve seat 8 is made of polytetrafluoroethylene material, and the sphere sealing ring 81 is made of rubber material. The sphere sealing ring 81 is elastically connected to the bottom of the sealing ring installation groove by an elastomer 82. The elastic member can be a common spring or the like. The control sphere 3 is arranged at the position between the two valve seats 8 in the main flow channel and is respectively in sealed sliding connection with the two valve seats 8. As shown in Figure 5As shown in the figure, the control sphere 3 is provided with a sphere through-hole 31 and two seal ring embedding grooves 32. By rotating the control sphere 3, the opening sizes between both ends of the through-hole of the sphere 3 and the first flow channel 11 and the second flow channel 21 can be controlled, so as to control the flow rate passing through the valve. The two seal ring embedding grooves 32 are respectively adapted to the two sphere seal rings 81. The central axes of the two seal ring embedding grooves 32 are both perpendicular to the central axis of the sphere through-hole 31. When the central axis of the sphere through-hole 31 rotates to be perpendicular to the central axis of the main flow channel, the sphere through-hole 31 is not communicated with the first flow channel 11 and the second flow channel 21. At this time, the valve body is in a fully closed state. Exactly at this angle, the seal ring embedding groove 32 rotates to be parallel to the central axis of the main flow channel. At this time, the sphere seal ring 81 can just pop out under the action of the elastic member and be embedded into the seal ring embedding groove 32, which can greatly increase the sealing performance between the control sphere 3 and the valve seat 8. Even when the surface of the valve seat 8 is worn, the sealing performance can be ensured by using the sphere seal ring 81; a valve rod mounting hole is provided on the side of the first valve body 1. The valve rod mounting hole is communicated with the first flow channel 11. The control valve rod 4 is rotatably arranged in the valve rod mounting hole. A packing groove is provided between the upper part of the valve rod mounting hole and the control valve rod 4. The packing groove is filled with a sealing packing 6. A packing pressing plate 7 is fixedly arranged at the upper end of the packing groove. The packing pressing plate 7 is used to seal the upper notch of the packing 6 groove. An anti-static bead 9 is elastically connected to the outer side wall of the control valve rod 4. The anti-static bead 9 is in sliding contact with the inner side wall of the valve rod mounting hole. The anti-static bead 9 can prevent the generation of frictional static electricity. Both ends of the control valve rod 4 are respectively arranged outside the first valve body 1 and in the main flow channel. One end of the control valve rod 4 located outside the first valve body 1 is fixedly connected with an operation handle 5, and one end of the control valve rod 4 located in the main flow channel is fixedly connected with the control sphere 3. In this way, by operating the control valve rod 4, the angle adjustment of the control sphere 3 can be completed, and further the flow rate of the valve can be controlled. By providing a limiting device with a specified angle on the control valve rod 4, the angle of the control sphere 3 can be adjusted more precisely.

[0025] The working principle of this embodiment is as follows:

[0026] When the valve body is fully closed, the control sphere 3 is adjusted so that the central axis of the sphere through-hole 31 is perpendicular to the central axis of the main flow channel. At this time, the central axes of the two seal ring embedding grooves 32 are exactly parallel to the central axis of the main flow channel. At this time, as shown in the attached Figure 2 figure, the sphere seal rings 81 in the two valve seats 8 pop out from the seal ring mounting grooves under the action of the elastic body 82 and are embedded into the seal ring embedding grooves 32, improving the sealing performance between the control sphere 3 and the valve seat 8;

[0027] When the valve body is opened, the control sphere 3 rotates until the sphere through-hole 31 is respectively communicated with the first flow channel 11 and the second flow channel 21. At this time, as shown in the attached Figure 4As shown, the spherical sealing ring 81 is retracted into the sealing ring installation groove under the extrusion of the outer side wall of the control sphere 3. In this way, when the control sphere 3 rotates, it will not be affected by the frictional resistance of the spherical sealing ring 81, and can rotate more smoothly. At the same time, it can better protect the spherical sealing ring 81 and prevent the spherical sealing ring 81 from excessive wear.

[0028] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation to the protection scope of the present invention: the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0029] The above is only a preferred embodiment of the present invention. Any person skilled in the art may modify the present invention by using the technical solutions described above or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent replacement made according to the technical solutions of the present invention falls within the scope of protection required by the present invention.

Claims

1. A floating ball valve, characterized in that: include: A first valve body (1) is used for installing various components, wherein a first flow channel (11) is provided inside the first valve body (1) for medium to flow, and a valve stem mounting hole is provided on a side of the first valve body (1), wherein the valve stem mounting hole is in communication with the first flow channel (11); A second valve body (2) is fixedly connected to the first valve body (1), wherein a second flow channel (21) for medium circulation is provided in the second valve body (2), and the second flow channel (21) is connected to the first flow channel (11) to form a main flow channel; Two valve seats (8) are provided in the first flow channel (11) and the second flow channel (21), respectively. The valve seats (8) are provided with a sealing ring installation groove, in which a ball sealing ring (81) is slidably provided, and the ball sealing ring (81) is elastically connected to the bottom of the sealing ring installation groove via an elastic body (82); A control ball (3) is arranged in the main flow channel and is respectively connected to the two valve seats (8) in a sealing and sliding manner. The control ball (3) is provided with a ball through hole (31) and two sealing ring embedding grooves (32). The two sealing ring embedding grooves (32) are respectively matched with the two ball sealing rings (81); A control valve stem (4) is rotatably arranged in the valve stem mounting hole, and two ends of the control valve stem (4) are respectively arranged outside the first valve body (1) and in the main flow channel, and one end of the control valve stem (4) located in the main flow channel is fixedly connected to the control ball (3).

2. A floating ball valve according to claim 1, characterized in that: The central axes of the two sealing ring embedding grooves (32) are both perpendicular to the central axis of the spherical through hole (31).

3. A floating ball valve according to claim 2, characterized in that: The valve seat (8) is made of polytetrafluoroethylene material, and the ball sealing ring (81) is made of rubber material.

4. A floating ball valve according to claim 1, characterized in that: A packing groove is provided between the upper part of the valve stem mounting hole and the control valve stem (4), the packing groove is filled with sealing packing (6), a packing pressure plate (7) is fixedly provided at the upper end of the packing groove, and the packing pressure plate (7) is used for sealing the upper notch of the packing (6) groove.

5. A floating ball valve according to claim 1, characterized in that: The outer side wall of the control valve stem (4) is elastically connected with an antistatic bead (9), and the antistatic bead (9) is in sliding contact with the inner side wall of the valve stem mounting hole.

6. A floating ball valve according to claim 1, characterized in that: One end of the control valve stem (4) located outside the first valve body (1) is fixedly connected to an operating handle (5).

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