Automatic compensation inclined double seal top entry fireproof floating ball valve

Abstract

The invention discloses an automatic compensation inclined surface double-sealed top-mounted fireproof floating ball valve, comprising a valve body, a spherical valve core is movably arranged in the valve body, a valve cover is sealed at the valve core installation hole on the valve body, a valve stem is passed through the valve cover, a supporting ring is arranged on the valve stem at the inner side of the valve cover, a positioning groove matched with the supporting ring is arranged on the valve cover, the lower end of the valve stem is movably embedded in the spherical valve core, a spring is sleeved on the valve stem between the spherical valve core and the supporting ring, medium channel openings of the valve body located on both sides of the spherical valve core are in the shape of inclined surfaces, and the vertical distance between one end of the inclined surface close to the valve stem and the center line of the valve stem is greater than the vertical distance between one end of the inclined surface far from the valve stem and the center line of the valve stem, metal valve seat rings are respectively clamped at both sides of the spherical valve core and the corresponding medium channel openings, the cross section of the metal valve seat ring is L-shaped, and the hook portion is provided with an inclined surface matched with the spherical valve core and pushes against the spherical valve core, and an elastic non-metallic valve seat ring is arranged in the metal valve seat ring for pushing against the spherical valve core and the medium channel opening.

Description

Technical Field

[0001] The invention relates to a floating ball valve. Background Art

[0002] Generally, floating ball valves are mostly direct-connected structures with left and right valve bodies, in which the thickness of the polytetrafluoroethylene valve seat ring must match the thickness of the gasket between the left and right valve bodies. This makes processing and installation difficult and the assembly effect difficult to control. After a period of use, the valve seat ring wears out and is prone to leakage. If there are particles in the medium, the valve seat ring will also scratch the valve seat ring and cause leakage. The quality is not stable enough. In addition, after the polytetrafluoroethylene valve seat ring encounters a fire, the valve seat ring will quickly soften and burn and cannot be sealed. It does not have a fireproof function, which limits the use of the medium and environment of the floating ball valve. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an automatic compensation inclined surface double sealing top-mounted fireproof floating ball valve.

[0004] In order to solve the above technical problems, the technical scheme adopted by the present invention is: an automatic compensation inclined double seal top-mounted fireproof floating ball valve, including a valve body, a medium channel is provided in the valve body, connecting flanges are provided at both ends of the valve body, a valve core mounting hole is provided on the valve body and vertically penetrates the medium channel, a ball valve core is movably provided in the valve core mounting hole, a medium flow hole is provided in the ball valve core, a valve cover is sealed at the opening of the valve core mounting hole on the valve body, a valve stem is passed through the valve cover, an annular mounting groove is provided around the valve stem on the outside of the valve cover, a packing assembly is provided in the mounting groove, a pressure cap for tightening the packing through a thread is provided on the valve stem, a rotating handle is sleeved on the top of the valve stem, a support ring is provided on the valve stem at the inner side of the valve cover, a positioning groove matching the support ring is provided on the valve cover, and the lower end of the valve stem is formed The ball valve core is polygonal in shape and is movably embedded in the ball valve core up and down. A spring is sleeved on the valve stem between the ball valve core and the support ring. The medium channel openings of the valve body located on both sides of the ball valve core are in the shape of an inclined surface, and the vertical distance between the end of the inclined surface close to the valve stem and the center line of the valve stem is greater than the vertical distance between the end of the inclined surface far from the valve stem and the center line of the valve stem. Metal valve seat rings are respectively clamped at the two sides of the ball valve core and the corresponding medium channel openings. The cross-section of the metal valve seat ring is L-shaped, and the hook is provided with an inclined surface that matches the ball valve core and pushes against the ball valve core. An elastic non-metallic valve seat ring that pushes against the ball valve core and the medium channel opening is provided in the metal valve seat ring. The friction-reducing pad is provided with an avoidance through hole for the valve stem to pass through. The end surface of the support ring facing the friction-reducing pad is provided with at least three ring grooves around the center axis of the valve stem.

[0005] As a preferred solution, the elastic non-metallic valve seat ring is a polytetrafluoroethylene valve seat ring.

[0006] As a preferred solution, the joint surface between the valve cover and the valve body is in a three-step shape, a stainless steel sealing gasket is provided between the second step surface between the valve cover and the valve body, and a fluororubber gasket is embedded inside the stainless steel sealing gasket.

[0007] As a preferred solution, an indicator sheet indicating the valve switch status is sleeved on the valve stem.

[0008] The beneficial effects of the present invention are:

[0009] In this automatic compensation inclined double seal top-mounted fireproof floating ball valve, since a spring is sleeved between the ball valve core and the support ring on the valve stem, the medium passage openings of the valve body located on both sides of the ball valve core are inclined and the vertical distance between the end of the inclined surface close to the valve stem and the center line of the valve stem is greater than the vertical distance between the end of the inclined surface far from the valve stem and the center line of the valve stem. Under the action of the spring force, the sealing surfaces of the valve body on both sides are tightly fitted with the metal valve seat ring and the elastic non-metal valve seat ring sealing surface, respectively forming a reliable sealing pressure ratio. When the valve seat ring is worn after long-term use and a gap is generated between the valve body sealing surface and the ball, the automatic compensation pressure is pressed tightly against the sealing surface under the action of the spring force, which can also form a reliable sealing pressure ratio and ensure the reliability of the seal.

[0010] And when a fire occurs, the elastic non-metallic valve seat ring softens and burns, and the metal valve seat ring is tightly pressed against the ball under the action of spring force to seal, ensuring that the medium will not leak internally, ensuring the safety of the system and preventing major accidents.

[0011] Since the joint surface between the valve cover and the valve body is in a three-step shape, a stainless steel sealing gasket is provided between the second step surface between the valve cover and the valve body, and a fluororubber gasket is embedded inside the stainless steel sealing gasket. In the event of a fire, the fluororubber softens and burns, and the stainless steel gasket plays a sealing role.

[0012] Since the valve stem shoulder is provided with a friction-reducing pad and the end of the shoulder is provided with three annular grooves, when a fire occurs, the polytetrafluoroethylene friction-reducing pad softens and burns, and the valve stem is pushed upward by the spring preload force. The end of the valve stem shoulder and the end face of the valve cover step hole form a labyrinth seal, which ensures the fireproof sealing requirements of the valve stem.

[0013] This valve adopts an integral top-loading structure. All parts in the valve body can be taken out by simply disassembling the upper valve cover, which is convenient for the maintenance and replacement of parts in the valve body. The ball valve can be maintained online without removing the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the main cross-sectional structure of the present invention.

[0015] Figure 2 yes Figure 1 K-direction schematic diagram.

[0016] Figure 3 yes Figure 1 An enlarged schematic diagram of part I.

[0017] Figure 4 yes Figure 1 Enlarged schematic diagram of part II.

[0018] Figure 5 yes Figure 1 An enlarged schematic diagram of Part III.

[0019] Figures 1 to 5 In: 1. Valve body 2. Ball valve core 3. Elastic non-metallic valve seat ring 4. Metal valve seat ring 5. Valve stem 6. Spring 7. Stainless steel sealing gasket 8. Valve cover 9. Friction reducing pad 10. Support ring 11. Sealing ring 12. Pressing ring 13. Gland 14. Indicator plate 15. Shaft end circlip 16. Handle 17. Stud 18. Hexagonal nut 19. Spring washer. DETAILED DESCRIPTION

[0020] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0021] like Figure 1 As shown, the automatic compensation inclined double seal top-mounted fireproof floating ball valve includes a valve body 1, a medium channel is provided in the valve body 1, connecting flanges are provided at both ends of the valve body 1, a valve core installation hole is provided on the valve body 1 and vertically penetrates the medium channel, a ball valve core 2 is movably provided in the valve core installation hole, a medium flow hole is provided in the ball valve core 2, a valve cover 8 is sealed at the valve core installation hole opening on the valve body 1, the valve cover 8 is connected to the valve body 1 through a plurality of studs, and a spring washer 19 and a hexagonal nut 18 are sleeved on the studs 17. The joint surface between the valve cover 8 and the valve body 1 is in a three-step step shape, a stainless steel sealing gasket 7 is provided between the second step surface between the valve cover 8 and the valve body 1, and a fluororubber gasket is embedded inside the stainless steel sealing gasket 7.

[0022] The valve stem 5 is inserted in the valve cover 8, and an annular mounting groove is provided around the valve stem 5 on the outside of the valve cover 8. The mounting groove is provided with a packing assembly-support ring 10, sealing ring 11 and pressure ring 12. The valve stem 5 is provided with a gland 13 that compresses the packing assembly through threads. A rotating handle 16 is sleeved on the top of the valve stem 5. An indicator sheet 14 that indicates the valve switch state is sleeved on the valve stem 5, and an axial end elastic ring 15 is provided between the rotating handle 16 and the indicator sheet 14.

[0023] A support ring is provided on the valve stem 5 at the inner side of the valve cover 8, and a positioning groove is provided on the valve cover 8 to match the support ring 10. An elastic non-metallic friction-reducing pad 9 is provided on the bottom of the positioning groove, and an avoidance through hole is provided on the friction-reducing pad 9 for the valve stem 5 to pass through. At least three ring grooves are provided around the central axis of the valve stem 5 on the end surface of the support ring facing the friction-reducing pad. The lower end of the valve stem 5 is polygonal and is embedded in the spherical valve core 2 in an upward and downward movable manner. A spring 6 is sleeved on the valve stem 5 between the spherical valve core 2 and the support ring.

[0024] The medium passage openings of the valve body 1 located on both sides of the spherical valve core 2 are in the shape of an inclined plane, and the vertical distance between the end of the inclined plane close to the valve stem 5 and the center line of the valve stem 5 is greater than the vertical distance between the end of the inclined plane far from the valve stem 5 and the center line of the valve stem 5. Metal valve seat rings 4 are respectively clamped at the two sides of the spherical valve core 2 and the corresponding medium passage openings. The cross section of the metal valve seat ring 4 is L-shaped, and the hook is provided with an inclined plane matching the spherical valve core and pushing against the spherical valve core. An elastic non-metallic valve seat ring 43 is provided inside the metal valve seat ring 4 to push against the spherical valve core and the medium passage opening. The elastic non-metallic valve seat ring 3 is a polytetrafluoroethylene valve seat ring.

[0025] During production, the material of the metal valve seat ring 4 can be 321, which is forged austenitic stainless steel; the material of the valve body 1 can be CF8, which is cast stainless steel; the material of the ball can be 316L, which is forged austenitic stainless steel; the metal valve seat ring 4 and the valve body 1, the metal valve seat ring 4 and the ball are matched to form sealing pairs of different materials, which can achieve reliable sealing effect without scratching the bite, see the partial enlargement Figure II .

[0026] The above-mentioned embodiments are only illustrative of the principles and effects of the invention, as well as some embodiments of its application, and are not intended to limit the invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the invention, and all of these belong to the protection scope of the invention.

Claims

1. An automatic compensation inclined double seal top-mounted fireproof floating ball valve, comprising a valve body, a medium channel is provided in the valve body, connecting flanges are provided at both ends of the valve body, a valve core mounting hole is provided on the valve body and vertically penetrates the medium channel, a spherical valve core is movably provided in the valve core mounting hole, a medium flow hole is provided in the spherical valve core, a valve cover is sealed at the opening of the valve core mounting hole on the valve body, a valve stem is passed through the valve cover, an annular mounting groove is provided around the valve stem on the outside of the valve cover, packing and a sealing ring are provided in the mounting groove, a gland is provided on the valve stem to compress the packing assembly through threads, a rotating handle is sleeved on the top of the valve stem, a support ring is provided on the valve stem at the inner side of the valve cover, a positioning groove matching the support ring is provided on the valve cover, the lower end of the valve stem is polygonal and is movably embedded in the spherical valve core, and the characteristics are: A spring is sleeved on the valve stem between the spherical valve core and the support ring, the medium channel openings of the valve body located on both sides of the spherical valve core are in the shape of an inclined surface, and the vertical distance between the end of the inclined surface close to the valve stem and the center line of the valve stem is greater than the vertical distance between the end of the inclined surface far from the valve stem and the center line of the valve stem, and metal valve seat rings are respectively clamped at the two sides of the spherical valve core and the corresponding medium channel openings, the cross-section of the metal valve seat ring is L-shaped, and the hook portion is provided with an inclined surface that matches the spherical valve core and pushes against the spherical valve core, and an elastic non-metallic valve seat ring that pushes against the spherical valve core and the medium channel opening is provided in the metal valve seat ring; an elastic non-metallic friction-reducing pad is provided on the bottom of the positioning groove, and an avoidance through hole is provided on the friction-reducing pad for the valve stem to pass through; at least three ring grooves are provided around the center axis of the valve stem on the end surface of the support ring facing the friction-reducing pad.

2. The automatic compensation inclined double seal top entry fireproof floating ball valve according to claim 1, characterized in that: The elastic non-metallic valve seat ring is a polytetrafluoroethylene valve seat ring.

3. The automatic compensation inclined double seal top entry fireproof floating ball valve as claimed in claim 2, characterized in that: The joint surface between the valve cover and the valve body is in a three-step shape, a stainless steel sealing gasket is arranged between the second step surface between the valve cover and the valve body, and a fluororubber gasket is embedded inside the stainless steel sealing gasket.

4. The automatic compensation inclined double seal top entry fireproof floating ball valve as claimed in claim 3, characterized in that: The valve stem is sleeved with an indicator sheet for indicating the switch state of the valve.

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