A parallel type floating ball valve with inclined seat

Abstract

The present invention belongs to valve technology, and specifically relates to a floating ball valve with a parallel valve seat inclined surface, comprising a valve body, a valve seat assembly, a ball, a valve cover and a valve stem, wherein the bottom end of the valve stem is connected to the ball, an outlet auxiliary valve seat is installed at the channel outlet of the valve body, and an inlet auxiliary valve seat is installed at the channel inlet of the valve body; the auxiliary valve seat comprises an integrally processed small cylinder and a wedge-shaped cylindrical block, and the end face of the wedge-shaped cylindrical block is a matching inclined surface. The device reduces the difficulty of inclined surface processing and grinding, and improves production efficiency; solves the problem that the inclined surface inclination angle is not limited by the valve seat material; cancels the spring pre-tightening structure between the ball and the valve stem, reduces the valve stem torque, and prevents the ball from not coinciding with the valve body channel axis after the sealing surface is worn.

Description

Technical Field

[0001] The invention belongs to valve technology, and in particular relates to a floating ball valve. Background Art

[0002] The flow resistance coefficient of the ball valve is relatively small, and the ball can be quickly opened and closed by rotating 90°. The ball valve has a simple structure, and the sealing surface and the ball are always in a fit state. The sealing surface is not easy to wear and the sealing effect is good, which makes the ball valve occupy a large market in the valve field. Ball valves are classified according to the assembly method, mainly side-mounted and top-mounted. Compared with side-mounted ball valves, the advantage of top-mounted ball valves is online replacement of internal parts, short maintenance time and reduced production losses.

[0003] The inclined surface mounted ball valves currently on the market have the following disadvantages: the valve body of the inclined surface mounted ball valve takes a long time to machine, and it is inconvenient to use matching tooling or machining centers to machine the inclined surface in the valve body cavity; the friction coefficients of the valve seats made of different materials in contact with the inclined surface are different, and the inclined surface angles that meet the self-locking conditions are also different; a spring is provided between the valve stem and the ball to provide preload force and compensation for the compression margin of the sealing surface after the sealing surface is worn. This structure easily causes the ball and the valve seat as a whole to move downward along the wedge surface, and the channel axis of the ball and the valve body do not coincide, resulting in increased fluid resistance and reduced sealing effect. Excessive spring force causes the valve stem torque to increase, and it is easy to cause the ball and the valve seat to lock, making the valve unable to switch; the valve seat has no limit device on the inclined surface. During the valve switching process, the valve seat and the ball as a whole will slide horizontally along the inclined surface perpendicular to the channel direction, and the sealing pair is easily worn. Summary of the invention

[0004] The object of the present invention is to provide a parallel valve seat inclined surface mounted floating ball valve, which can reduce the difficulty of inclined surface processing and grinding and improve production efficiency.

[0005] The technical solution of the present invention is as follows:

[0006] A parallel type valve seat inclined surface mounted floating ball valve, comprising a valve body, a valve seat assembly in the valve body, a ball at the center of the valve body channel, a valve cover above the valve body and a valve stem in the valve cover, wherein the bottom end of the valve stem is connected to the ball;

[0007] An outlet-end auxiliary valve seat is installed at the channel outlet of the valve body, and an inlet-end auxiliary valve seat is installed at the channel inlet of the valve body;

[0008] The auxiliary valve seat at the outlet and the auxiliary valve seat at the inlet have the same structure and are arranged relative to each other, and include a small cylinder and a wedge-shaped cylindrical block that are integrally processed, and a limit ring that is fixedly connected to the matching inclined surface at the end of the wedge-shaped cylindrical block; the small cylinder and the wedge-shaped cylindrical block are processed with a channel along the central axis direction;

[0009] The valve seat assembly comprises a soft valve seat and an external supporting ring, wherein one side of the soft valve seat contacts with the matching inclined surface, and the other side contacts with the ball.

[0010] An annular groove is processed on the side surface of the small cylinder, a graphite gasket is placed in the groove, and the graphite gasket is in contact with the valve body.

[0011] A positioning groove is processed on the cylindrical side surface of the wedge-shaped cylindrical block, and a set screw is arranged on the valve body, and the lower end of the set screw is located in the positioning groove.

[0012] A circle of chamfer is processed on the end of the center channel on the matching inclined surface to serve as a fireproof lip.

[0013] A gasket is arranged above the valve body and between the valve cover, and the valve body and the valve cover are fixed by studs and nuts.

[0014] The inner wall of the valve cover is processed with a circle of protruding annular plate, and a thrust pad is arranged between the frustum at the bottom of the valve stem and the annular plate.

[0015] The gap between the valve stem and the valve cover is filled with graphite filler, which is then compacted by a compression sleeve.

[0016] A pressing plate is provided at the upper end of the valve stem, and the pressing plate presses the pressing sleeve tightly.

[0017] The handle is fixedly installed on the pressure plate by screws, and the handle is connected and fixed to the top of the valve stem by washers and bolts above the handle.

[0018] A plurality of wrench holes are processed on the cylindrical side surface of the wedge-shaped cylindrical block.

[0019] The remarkable effects of the present invention are as follows:

[0020] Reduce the difficulty of bevel processing and grinding, and improve production efficiency; solve the problem that the bevel inclination angle is not limited by the valve seat material; cancel the spring pre-tightening structure between the ball and the valve stem, reduce the valve stem torque, and prevent the ball and the valve body channel axis from not coinciding after the sealing surface is worn.

[0021] The matching bevel is located on the wedge block. The matching bevel is processed by wire cutting, and the limit block is fixed on the matching bevel by welding or bolting, or the matching bevel and the limit ring on the wedge block are integrally processed by a CNC machining center, which can reduce the difficulty and time of machining and facilitate grinding and polishing.

[0022] The position of the valve seat is fixed by a limit ring to prevent the ball and the valve body channel from maintaining axis coincidence after the sealing surface is worn, thus preventing the valve seat from sliding on the inclined surface during the valve opening and closing process.

[0023] The two matching inclined surfaces on the left and right sides of the sphere are parallel to each other, which can offset the upward force of the medium on the sphere along the vertical wedge surface. There is no need to redesign the wedge angle and surface roughness for different sealing materials.

[0024] The disc spring is used to fill the gap between the ball and the soft valve seat sealing surface, automatically compensating for the wear of the sealing surface after the valve is opened and closed for a long time, ensuring long-term sealing requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of a floating ball valve mounted on a parallel valve seat slope;

[0026] Figure 2 It is a schematic diagram of the auxiliary valve seat structure;

[0027] Figure 3 It is a schematic diagram of the valve seat assembly structure;

[0028] Figure 4a to Figure 4c It is a schematic diagram of the installation process of the valve seat assembly and the ball;

[0029] Figure 5 It is a schematic diagram of the rotation and limit of the wedge block for operating the wrench;

[0030] In the figure: 1. valve body; 2. auxiliary valve seat at the outlet end; 3. valve seat assembly; 4. ball; 5. auxiliary valve seat at the inlet end; 6. disc spring; 7. set screw; 8. gasket; 9. valve cover; 10. stud; 11. nut; 12. handle; 13. bolt; 14. washer; 15. screw; 16. pressure plate; 17. pressing sleeve; 18. graphite packing; 19. thrust pad; 20. valve stem; 21. limit ring; 22. fireproof lip; 23. positioning groove; 24. graphite gasket; 25. spanner hole; 26. wedge-shaped cylindrical block; 27. spanner; 28. support ring; 29. ​​soft valve seat; 30. matching inclined surface; 31. small cylinder. DETAILED DESCRIPTION

[0031] The present invention will be further described below through the accompanying drawings and specific implementation methods.

[0032] like Figure 1 As shown, the floating ball valve includes a valve body 1, an outlet auxiliary valve seat 2 is installed at the outlet of the passage of the valve body 1, and an inlet auxiliary valve seat 5 is installed at the inlet of the passage of the valve body 1. A ball 4 is installed between the outlet auxiliary valve seat 2 and the inlet auxiliary valve seat 5 through a valve seat assembly 3, and the ball 4 is located at the center of the passage of the valve body 1.

[0033] The valve seat assembly 3 and the auxiliary valve seat connect the ball 4 and the valve body 1.

[0034] The auxiliary valve seat 2 at the outlet end and the auxiliary valve seat 5 at the inlet end are fixed to the valve body 1 by means of set screws 7 respectively.

[0035] A disc spring 6 is installed between the valve body 1 and the auxiliary valve seat 2 at the outlet end, and the disc spring 6 provides an initial pre-tightening force to form a closed position seal of the internal components of the channel pipeline.

[0036] A valve cover 9 is installed above the valve body 1 through a gasket 8 and then fixed through a stud 10 and a nut 11.

[0037] A valve stem 20 is installed at the center of the valve cover 9, and the bottom end of the valve stem 20 is connected to the ball 4. The valve stem 20 connects the ball 4 and the valve cover 9.

[0038] In order to prevent the valve stem 20 from moving up and down, a protruding annular plate is processed on the inner wall of the valve cover 9, and a thrust pad 19 is installed between the truncated cone at the bottom of the valve stem 20 and the annular plate.

[0039] The gap between the valve stem 20 and the valve cover 9 is filled with graphite filler 18 and then compacted by the pressing sleeve 17 .

[0040] A pressing plate 16 is installed on the upper end of the valve stem 20 , and the pressing plate 16 presses the pressing sleeve 17 .

[0041] The handle 12 is fixedly mounted on the pressure plate 16 by means of screws 15 , and the handle 12 is connected and fixed to the top of the valve stem 20 by means of washers 14 and bolts 13 above the handle 12 .

[0042] The inlet auxiliary valve seat and outlet auxiliary valve seat at the left and right ends have the same structure. Figure 2 As shown, the auxiliary valve seat includes a limiting ring 21 , a small cylinder 31 and a wedge-shaped cylindrical block 26 .

[0043] The small cylinder 31 and the wedge-shaped cylindrical block 26 are integrally formed, the two are coaxial and have a hole in the center.

[0044] The wedge-shaped cylindrical block 26 is cylindrical, wherein the outer end face is a matching slope 30, and the end face and the cross section of the cylinder have a certain angle, that is, the matching slope 30 and the vertical cross section of the valve body channel have a certain angle.

[0045] A limiting ring 21 is welded on the matching bevel 30 so that the limiting ring 21 fits the outer edge of the matching bevel. A chamfer is machined on the matching bevel 30 and the end of the central channel as a fireproof lip 22.

[0046] A positioning groove 23 and a plurality of wrench holes 25 are processed on the cylindrical side surface of the wedge-shaped cylindrical block 26 .

[0047] The two positioning grooves 23 are symmetrically distributed in the circumferential direction, and the plurality of wrench holes 25 are evenly distributed in the circumferential direction.

[0048] like Figure 1 As shown in FIG. 4 , the set screw 7 is mounted on the valve body 1 , and the lower end thereof contacts and cooperates with the positioning groove 23 to limit the axial rotation and lateral movement of the wedge block 26 .

[0049] The side of the small cylinder 31 is processed with an annular groove, and a graphite gasket 24 is placed in the groove. When installed, the graphite gasket 24 contacts the valve body 1.

[0050] like Figure 3 As shown, the valve seat assembly 3 includes a soft valve seat 29 and an external support ring 28. The soft valve seat 29 contacts the matching inclined surface 30 on one side and contacts the ball 4 on the other side.

[0051] As shown in Figures 4 and 5, by cooperating with the spanner 27 and the spanner hole 25 on the cylindrical wedge block 26, the wedge block 26 can be rotated 180° around the axis of the valve body 1 channel, so that the left and right matching inclined surfaces 30 of the sphere are parallel, and the set screw 7 on the valve body 1 contacts and cooperates with the positioning groove 23 to limit the axial rotation and lateral movement of the wedge block 26.

[0052] Figure 4a to Figure 4c The process of installing the ball 4 and the valve seat assembly 3 between the auxiliary valve seat 2 at the outlet end and the auxiliary valve seat 5 at the inlet end in the valve body 1 is given. After the ball 4 is installed in place, the wrench 27 controls the cylindrical wedge block 26 to rotate to adjust the position of the valve seat assembly 3.

[0053] The disc spring 6 is located between the valve body 1 and the auxiliary valve seat 2 at the outlet end, the graphite gasket 24 contacts the wedge block 26 and the valve body 1, and the soft valve seat 29 contacts the matching inclined surface 30 and the ball 4. The disc spring 6 provides an initial preload force to form a closed position seal of the internal components of the channel pipeline;

[0054] The gasket 8 contacts the valve body 1 and the valve cover 9, and the stud 10 and the nut 11 press the gasket 8 through the gland 9 to form a seal between the valve body and the valve cover;

[0055] The graphite packing 18 is in contact with the valve stem 20 and the valve cover 9 , and the screw 15 compresses the graphite packing 18 through the pressing plate 16 and the pressing sleeve 17 to form a seal between the valve stem 20 and the valve cover 9 .

[0056] After the soft valve seat 29 is burned out, the fireproof lip 22 on the wedge block 26 contacts the ball 4 and plays a fireproof function together with the graphite filler 18, the gasket 8 and the graphite gasket 24.

[0057] The valve stem 20 is provided with an anti-static device, which transmits the static electricity on the ball 4 to the valve cover 9 and the valve body 1. The handle 12 is connected to the valve stem 20 through the bolt 13 and the washer 14. The handle 12 controls the rotation of the ball 4 through the valve stem 20, and the screw 15 limits the rotation of the handle 12 within 90°, thereby playing the valve switch limit function.

Claims

1. A parallel type valve seat inclined surface mounted floating ball valve, comprising a valve body (1), a valve seat assembly (3) in the valve body (1), a ball at the center of a passage of the valve body (1), a valve cover (9) above the valve body (1) and a valve stem (20) in the valve cover (9), wherein the bottom end of the valve stem (20) is connected to the ball (4); Features: An outlet-end auxiliary valve seat (2) is installed at the outlet of the channel of the valve body (1), and an inlet-end auxiliary valve seat (5) is installed at the inlet of the channel of the valve body (1); The outlet auxiliary valve seat (2) and the inlet auxiliary valve seat (5) have the same structure and are arranged relative to each other, and include an integrally processed small cylinder (31) and a wedge-shaped cylindrical block (26), and a limit ring (21) fixedly connected to a matching inclined surface at the end of the wedge-shaped cylindrical block (26); a hole is processed in the small cylinder (31) and the wedge-shaped cylindrical block (26) along the central axis direction; The valve seat assembly (3) comprises a soft valve seat (29) and an external support ring (28); one side of the soft valve seat (29) contacts the matching inclined surface (30), and the other side contacts the ball (4); The cylindrical side surface of the wedge-shaped cylindrical block (26) is processed with a positioning groove (23); the valve body (1) is provided with a set screw (7), and the lower end of the set screw (7) is located in the positioning groove (23); the cylindrical side surface of the wedge-shaped cylindrical block (26) is processed with a plurality of wrench holes (25); The wedge-shaped cylindrical block (26) is cylindrical, wherein the outer end surface is a matching inclined surface (30), and the matching inclined surface (30) forms a certain angle with the vertical cross section of the valve body channel; By engaging the spanner (27) with the spanner hole (25) on the wedge-shaped cylindrical block (26), the wedge-shaped cylindrical block (26) can be rotated 180° around the axis of the valve body (1) passage, so that the two left and right matching inclined surfaces (30) of the sphere are parallel, and the set screw (7) on the valve body (1) contacts and engages with the positioning groove (23) to limit the axial rotation and lateral movement of the wedge-shaped cylindrical block (26).

2. A parallel type valve seat inclined surface mounted floating ball valve as claimed in claim 1, characterized in that: An annular groove is machined on the side surface of the small cylinder (31), a graphite gasket (24) is placed in the groove, and the graphite gasket (24) is in contact with the valve body (1).

3. A parallel type valve seat inclined surface mounted floating ball valve as claimed in claim 1, characterized in that: A circle of chamfer is processed on the matching inclined surface (30) and the end of the central channel to serve as a fireproof lip (22).

4. A parallel type valve seat inclined surface mounted floating ball valve as claimed in claim 1, characterized in that: A gasket (8) is provided between the upper portion of the valve body (1) and the valve cover (9), and the valve body (1) and the valve cover (9) are fixed by means of studs (10) and nuts (11).

5. A parallel type valve seat inclined surface mounted floating ball valve as claimed in claim 1, characterized in that: The inner wall of the valve cover (9) is processed with a protruding annular plate, and a thrust pad (19) is provided between the truncated cone at the bottom of the valve stem (20) and the annular plate.

6. A parallel type valve seat inclined surface mounted floating ball valve as claimed in claim 1, characterized in that: The gap between the valve stem (20) and the valve cover (9) is filled with graphite filler (18), which is then compacted by a compression sleeve (17).

7. A parallel type valve seat inclined surface mounted floating ball valve as claimed in claim 6, characterized in that: A pressing plate (16) is provided at the upper end of the valve stem (20), and the pressing plate (16) presses the pressing sleeve (17).

8. A parallel type valve seat inclined surface mounted floating ball valve as claimed in claim 7, characterized in that: The handle (12) is fixedly mounted on the pressure plate (16) by means of screws (15), and the handle (12) is connected and fixed to the top of the valve stem (20) by means of washers (14) and bolts (13) above the handle (12).

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