Top-mounted single-valve-seat two-way sealing fixed ball valve

Abstract

The utility model provides a top-mounted single-valve-seat two-way sealing fixed ball valve which comprises a valve body, a heat preservation jacket arranged outside the valve body in a surrounding mode, a containing cavity formed in the valve body, a valve ball arranged in the containing cavity in a rotating mode, medium flow channels arranged on the two sides of the valve body in a penetrating mode, an upper cover arranged above the valve body, a valve shaft arranged on the upper cover in an axial penetrating mode, and a plane bearing arranged on the valve shaft in a sleeved mode. The upper end of the valve shaft penetrates through the upper cover and extends out of the upper cover, the lower end of the valve shaft is connected with the valve ball to form a transmission chain, padding is arranged between the upper portion of the valve shaft and the upper cover, and a valve seat assembly is arranged between the inlet side of the valve body and the valve ball. The ball valve is ingenious in structure, novel in design, convenient and fast to assemble, suitable for new material project PE and PP production devices and capable of effectively preventing particles or fine powder media from accumulating in a valve cavity and avoiding the situation that the valve cannot act due to the fact that the valve ball is locked, and therefore long-term stable operation of the ball valve is guaranteed; a sealing pair formed by the valve ball and the valve ball can cut off medium pressure from the two sides of the valve, and the two-way sealing requirement is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field especially, relate to a kind of upper-mounted single valve seat bidirectional sealing fixed ball valve. BACKGROUND

[0002] The upper-mounted ball valve is a valve widely used in industrial pipeline system, which has many remarkable features in design. First, the upper-mounted ball valve is convenient to install and maintain. Since the upper-mounted design is adopted, the maintenance and replacement of the valve become simple and fast, without the need to disassemble the entire valve or pipeline system, greatly reducing the maintenance time and cost. The valve ball and valve seat sealing pair of the upper-mounted ball valve can adopt metal sealing or non-metal sealing structure, which can effectively prevent medium leakage and ensure the safe and stable operation of the pipeline system, and is widely used in petroleum, chemical, metallurgical, electric power, pharmaceutical and other industries. To facilitate disassembly and assembly, the valve ball and valve seat sealing surface of the traditional upper-mounted ball valve adopt a wedge surface structure. To achieve a zero-leakage sealing level, the wedge sealing surface needs a larger sealing specific pressure than the traditional parallel sealing surface. The torque of the valve is large. Since the valve ball and valve seat sealing surface are always in contact, wear of the valve ball and valve seat sealing surface is easily caused during the opening and closing process, resulting in internal leakage of the valve. To overcome this defect, researchers have developed a new type of upper-mounted ball valve structure, with parallel double valve seats on both sides. This product can greatly reduce the valve operating torque and make the sealing more reliable. However, the parallel valve seat requires a tool to spread the two valve seats during valve assembly, so that the valve ball can be installed into the valve cavity. The assembly process is complex and inefficient, and online disassembly and maintenance of the valve cannot be achieved. In addition, the double valve seat structure ball valve is isolated by two valve seats in the closed position. When the valve transports medium containing particles or fine powder impurities, it is easy to cause accumulation. During the opening and closing process of the valve, the accumulated impurities will scratch the sealing surface, causing internal leakage of the valve. Over time, the accumulation of medium in the valve cavity will cause the valve ball to be stuck, eventually leading to jamming or failure of the valve action. SUMMARY

[0003] To overcome the deficiencies in the prior art, the utility model provides an upper-mounted single valve seat bidirectional sealing fixed ball valve, which is ingenious in structure, novel in design, convenient to assemble, suitable for new material project PE, PP production device, can effectively prevent particles or fine powder medium from accumulating in the valve cavity, avoid the valve ball from being stuck to cause the valve to fail to act, and thus ensure the long-term stable operation of the ball valve.

[0004] The technical scheme adopted by the utility model is as follows:

[0005] The utility model provides a kind of upper-mounted single valve seat bidirectional sealing fixed ball valve, wherein: including valve body, the valve body is provided with heat insulation jacket outside around, the valve body is provided with accommodating cavity inside, the valve ball is rotationally arranged in the accommodating cavity, the medium flow channel is arranged through the valve body both sides, the upper cover is arranged on the valve body, the valve shaft is axially arranged through the upper cover, the valve shaft is set with plane bearing, the valve shaft upper end portion passes through the upper cover and extends to the outside of upper cover, the valve shaft lower end portion is connected with the valve ball and forms transmission chain, the valve shaft upper portion is arranged with packing between the valve shaft upper portion and the upper cover, the valve seat assembly is arranged between the valve body inlet side and the valve ball.

[0006] Preferably, the upper-mounted single valve seat bidirectional sealing fixed ball valve, wherein: the medium flow channel includes inlet side flow channel, connecting flow channel and outlet side flow channel, the inlet side flow channel and outlet side flow channel are arranged horizontally symmetrically about the accommodating cavity, the output end of the inlet side flow channel is communicated through the input end of the connecting flow channel and the outlet side flow channel, and the input end of the inlet side flow channel and the output end of the outlet side flow channel are located on the end face of the valve body.

[0007] Preferably, the upper-mounted single valve seat bidirectional sealing fixed ball valve, wherein: the inlet side flow channel forms a diameter decreasing taper hole from the input end to the output end, and the outlet side flow channel is provided with a circular arc transition surface at the connection with the connecting flow channel.

[0008] Preferably, the upper-mounted single valve seat bidirectional sealing fixed ball valve, wherein: the surface finish of the outlet side flow channel is 0.8 μm.

[0009] Preferably, the upper-mounted single valve seat bidirectional sealing fixed ball valve, wherein: the valve ball is provided with upper ball handle and lower ball handle, the valve shaft is provided with flat groove at the position corresponding to the upper ball handle, the flat groove and the upper ball handle are connected and matched, the valve body is provided with lower shaft hole at the position corresponding to the lower ball handle, and the lower ball handle of the valve ball and the lower shaft hole are inserted and matched.

[0010] Preferably, the upper-mounted single valve seat bidirectional sealing fixed ball valve, wherein: the lower bushing and the first dustproof ring are arranged between the lower shaft hole of the valve body and the lower ball handle of the valve ball, and the upper bushing and the second dustproof ring are arranged between the upper cover and the upper ball handle of the valve ball.

[0011] Preferably, the upper-mounted single valve seat bidirectional sealing fixed ball valve, wherein: the valve seat assembly includes valve seat, the valve seat mounting hole is arranged at the connection of the inlet side flow channel and the connecting flow channel, the valve seat mounting hole includes first stepped hole, second stepped hole and third stepped hole arranged from inside to outside in sequence, the valve seat is provided with first step portion, second step portion and third step portion at the positions corresponding to the first stepped hole, the second stepped hole and the third stepped hole, the valve seat is sleeved in the valve seat mounting hole, and the valve seat, the first disc spring, the pressing ring, the graphite sealing ring, the supporting ring, the O-shaped sealing ring and the second disc spring are arranged from inside to outside in sequence between the second stepped hole and the second step portion.

[0012] Preferably, the upper-mounted single-valve-seat bidirectional sealing fixed ball valve, wherein: the position of the valve ball corresponding to the outlet side flow channel is provided with an outlet side relief.

[0013] The upper-mounted single-valve-seat bidirectional sealing fixed ball valve has the advantages that:

[0014] (1) The upper-mounted single-valve-seat bidirectional sealing fixed ball valve has a load-adjustable flexible sealing structure at the connection between the valve body and the upper cover, and the bolt load can be dynamically adjusted according to the medium temperature and pressure fluctuation, so that an ideal sealing state is achieved.

[0015] (2) The upper-mounted single-valve-seat bidirectional sealing fixed ball valve has a single valve seat design, the valve ball outlet side is vented, there is no valve seat design, the middle cavity is open, the valve body outlet side flow channel is polished, the surface roughness reaches 0.8 μm, the medium flow can automatically clean the deposits in the middle cavity, the middle cavity is prevented from accumulating materials, and sticking and internal leakage of the valve caused by accumulation of materials in the valve cavity are avoided; the valve ball and the valve seat only need to be matched and ground on one side of the sealing pair, so that the matching and grinding time is shortened; at the same time, the single sealing pair reduces the valve operation torque, and further reduces the valve drive device configuration and the valve manufacturing cost.

[0016] (3) The upper-mounted single-valve-seat bidirectional sealing fixed ball valve has a double-piston structure, and the sealing pair formed by the valve seat and the valve ball can cut off the medium pressure from both sides of the valve, so that the bidirectional sealing requirement is achieved.

[0017] (4) The upper-mounted single-valve-seat bidirectional sealing fixed ball valve has an outlet side relief provided at the position of the valve ball corresponding to the outlet side flow channel, compared with the traditional upper-mounted ball valve, the valve inner part can be disassembled and assembled without tooling, and online disassembly and maintenance are facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The figure is a structural schematic view of the utility model.

[0019] Figure 2 The figure is an enlarged view of the valve seat local structure of the utility model.

[0020] Figure 3 The figure is an enlarged view of the valve shaft local structure of the utility model.

[0021] Figure 4 The figure is an enlarged view of the valve ball local structure of the utility model.

[0022] Figure 5 The figure is an appearance view of the utility model. DETAILED DESCRIPTION

[0023] The utility model will be further described below in combination with specific drawings and examples.

[0024] As Figures 1-5 A top-mounted single-valve seat bidirectional sealing fixed ball valve, comprising a valve body 1, an outer ring of the valve body 1 is provided with a heat preservation jacket 12, an accommodation cavity is arranged in the valve body 1, a valve ball 5 is arranged in rotation in the accommodation cavity, a medium flow channel 13 is arranged through the two sides of the valve body 1, an upper cover 2 is arranged above the valve body 1, a valve shaft 9 is arranged through the upper cover 2 in an axial direction, a plane bearing 10 is sleeved on the valve shaft 9, the upper end of the valve shaft 9 penetrates through the upper cover 2 and extends to the outside of the upper cover 2, the lower end of the valve shaft 9 is connected with the valve ball 5 to form a transmission chain, a packing 11 is arranged between the upper part of the valve shaft 9 and the upper cover 2, and a valve seat assembly 6 is arranged between the inlet side of the valve body 1 and the valve ball 5.

[0025] The medium flow channel 13 comprises an inlet side flow channel 131, a connecting flow channel 132 and an outlet side flow channel 133, the inlet side flow channel 131 and the outlet side flow channel 133 are arranged in horizontal symmetry about the accommodation cavity, the output end of the inlet side flow channel 131 is communicated with the input end of the connecting flow channel 132 and the outlet side flow channel 133, and the input end of the inlet side flow channel 131 and the output end of the outlet side flow channel 133 are both located on the end face of the valve body 1.

[0026] The inlet side flow channel 131 forms a diameter-reducing hole with gradually decreasing diameters from the input end to the output end, and a circular arc transition surface is arranged at the connection between the outlet side flow channel 133 and the connecting flow channel 132; the surface roughness of the outlet side flow channel 133 is 0.8 μm.

[0027] An upper ball handle 52 and a lower ball handle 53 are arranged on the valve ball 5, a flat groove 91 is arranged on the valve shaft 9 at a position corresponding to the upper ball handle 52, the flat groove 91 and the upper ball handle 52 are in clamping connection, a lower shaft hole is arranged on the valve body 1 at a position corresponding to the lower ball handle 53, and the lower ball handle 53 of the valve ball 5 is inserted into the lower shaft hole of the valve body; a lower bushing 3 and a first dustproof ring 4 are arranged between the lower shaft hole of the valve body 1 and the lower ball handle 53 of the valve ball 5, and an upper bushing 8 and a second dustproof ring 7 are arranged between the upper cover 2 and the upper ball handle 52 of the valve ball 5, so as to prevent fine powder medium from entering the gap between the bushings and avoid the valve ball from being stuck.

[0028] The valve seat assembly 6 comprises a valve seat 61, a valve seat mounting hole 134 is arranged at the connection between the inlet side flow channel 131 and the connecting flow channel 132, the valve seat mounting hole 134 comprises a first stepped hole, a second stepped hole and a third stepped hole arranged in sequence from inside to outside, the valve seat 61 is arranged on the valve seat 61 at positions corresponding to the first stepped hole, the second stepped hole and the third stepped hole, the valve seat 61 is sleeved in the valve seat mounting hole 134, the valve seat 61, a first disc spring 62, a pressing ring 63, a graphite sealing ring 64, a supporting ring 65, an O-shaped sealing ring 66 and a second disc spring 67 are arranged in sequence from inside to outside between the second stepped hole and the second stepped part, an outlet side recessed part 51 is arranged on the valve ball 5 at a position corresponding to the outlet side flow channel 133, Figure 2The inner diameter position of the middle valve seat 61 is 611, and the outer diameter position is 612.

[0029] The upper cover 2 is bolted on the upper end of the valve body 1, and a sealing element is arranged at the connection between the valve body 1 and the upper cover 2, which is a winding gasket, and the winding gasket is a load-adjustable flexible sealing structure, which can dynamically adjust the bolt load according to the medium temperature and pressure fluctuation to achieve an ideal sealing state; the valve body 1 is provided with a jacket 12, and the medium in the valve is heated and kept warm by a heat medium.

[0030] The sealing surface of the valve seat 61 and one side of the valve ball 5 are hardened and paired with diamond abrasive paste for grinding, and the surface finish reaches 0.2 μm; the valve seat 61 is designed to have an average diameter greater than the inner diameter of the radial sealing piston, so that a double-piston structure is formed by the difference in the annular area, and the sealing pair formed with the valve ball 5 can cut off the medium pressure from both sides of the valve to meet the bidirectional sealing requirement; the outlet side of the valve ball 5 is designed without a valve seat, and an outlet side overflow part 51 is arranged to facilitate the installation of the valve internals.

[0031] The valve body 1 is provided with a jacket, and the medium in the valve can be heated and kept warm by a heat medium, which is suitable for the medium crystallization condition, prevents the medium from crystallizing after cooling, and causes the valve to be unable to act.

[0032] The single valve seat design, the valve ball 5 outlet side is empty, the valve body 1 outlet side flow channel 133 polishing treatment, surface finish reaches 0.8 μm, the flow of medium can automatically clean the sediment of the connecting flow channel 132 and the outlet side flow channel 133, prevent the medium from crystallizing after cooling, and causes the valve to be unable to act.

[0033] The valve seat assembly 6 is designed as a double-piston structure, and the sealing pair formed with the valve ball 5 can cut off the medium pressure from both sides of the valve to meet the bidirectional sealing requirement; the outlet side position of the valve ball 5 is provided with an outlet side overflow part 51, which can be disassembled and assembled without tooling compared with the traditional top-mounted ball valve, and is convenient for online disassembly and maintenance.

[0034] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present application and are not limiting, although the present application has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A top entry single seat bi-directional seal fixed ball valve characterized by: The valve body (1) is provided with a heat preservation jacket (12) outside, a containing cavity is arranged inside, a valve ball (5) is arranged rotatingly in the containing cavity, medium flow channels (13) are arranged penetratingly on both sides of the valve body (1), an upper cover (2) is arranged above the valve body (1), a valve shaft (9) is arranged penetratingly axially in the upper cover (2), a plane bearing (10) is sleeved on the valve shaft (9), the upper end of the valve shaft (9) penetrates through the upper cover (2) and extends out of the upper cover (2), the lower end of the valve shaft (9) is connected with the valve ball (5) to form a transmission chain, a packing (11) is arranged between the upper part of the valve shaft (9) and the upper cover (2), a valve seat assembly (6) is arranged between the inlet side of the valve body (1) and the valve ball (5); The medium flow channel (13) comprises an inlet side flow channel (131), a connecting flow channel (132) and an outlet side flow channel (133); The valve seat assembly (6) comprises a valve seat (61), a valve seat mounting hole (134) is arranged between the inlet side flow channel (131) and the connecting flow channel (132), the valve seat mounting hole (134) comprises first, second and third stepped holes arranged in sequence from inside to outside, the valve seat (61) is sleeved in the valve seat mounting hole (134), and the valve seat (61), a first disc spring (62), a pressing ring (63), a graphite sealing ring (64), a supporting ring (65), an O-shaped sealing ring (66) and a second disc spring (67) are arranged in sequence from inside to outside between the second stepped hole and the second step portion.

2. The top entry single seat bi-directional sealing fixed ball valve according to claim 1, characterized in that: The inlet side flow channel (131) and the outlet side flow channel (133) are arranged horizontally symmetrically about the containing cavity, the output end of the inlet side flow channel (131) is communicated with the input end of the outlet side flow channel (133) through the connecting flow channel (132), and the input end of the inlet side flow channel (131) and the output end of the outlet side flow channel (133) are both located on the end face of the valve body (1).

3. The top entry single seat bi-directional sealing fixed ball valve according to claim 2, characterized in that: The inlet side flow channel (131) forms a diameter-reducing hole with diameters decreasing in sequence from the input end to the output end, and a circular arc transition surface is arranged at the connection between the outlet side flow channel (133) and the connecting flow channel (132).

4. The top entry single seat bi-directional sealing fixed ball valve according to claim 2, characterized in that: The surface finish of the outlet side flow channel (133) is 0.8 μm.

5. The top entry single seat bi-directional sealing fixed ball valve according to claim 1, wherein: An upper ball handle (52) and a lower ball handle (53) are arranged on the valve ball (5), a flat groove (91) is arranged on the valve shaft (9) corresponding to the position of the upper ball handle (52), the flat groove (91) and the upper ball handle (52) are in clamping connection, and a lower shaft hole is arranged on the valve body (1) corresponding to the position of the lower ball handle (53), the lower ball handle (53) of the valve ball (5) is in plug connection with the lower shaft hole.

6. The top entry single seat bi-directional sealing fixed ball valve according to claim 5, characterized in that: A lower bushing (3) and a first dustproof ring (4) are arranged between the lower shaft hole of the valve body (1) and the lower ball handle (53) of the valve ball (5), and an upper bushing (8) and a second dustproof ring (7) are arranged between the upper cover (2) and the upper ball handle (52) of the valve ball (5).

7. The top entry single seat bi-directional sealing fixed ball valve according to claim 1, wherein: An outlet side sliding portion (51) is arranged on the valve ball (5) corresponding to the position of the outlet side flow channel (133).

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