Valve assembly and conveying pipeline

Abstract

The invention relates to the field of valves, and discloses a valve assembly and a conveying pipeline, the valve assembly comprises a valve rod, a pressing plate and a stuffing box, the stuffing box is provided with sealing stuffing, and the valve assembly further comprises a sealing structure arranged on the outer side of the pressing plate; the sealing structure comprises a clamp arranged on the valve rod in a sleeving mode, additional filler arranged between the clamp and the valve rod, a pressing piece arranged on the outer side of the additional filler and a screw rod penetrating through the pressing piece and connected to the pressing plate, and a nut is arranged on the portion, located on the outer side of the pressing piece, of the screw rod. By means of the technical scheme, the added sealing structure can seal the valve rod again on the outer side of the original sealing filler under the condition that the original structure is not disassembled, the structure is simple, installation is convenient, and the leakage problem after online valve sealing failure can be effectively solved.

Description

Technical Field

[0001] The invention relates to the field of valves, in particular to a valve assembly and a conveying pipeline. Background Art

[0002] Valves of various specifications are widely used in work and life. During use, frequent valve opening, working temperature fluctuation, impact caused by medium fluctuation and other reasons can easily cause valve packing wear and gland T-bolt loosening, which will cause leakage at the valve stem. At this time, it is necessary to continuously tighten the two T-bolts at the gland to compact the packing and eliminate the leakage. Once this method fails, the leakage at the valve screw cannot be eliminated.

[0003] During the high-load and long-cycle production period of petrochemical enterprises, most valves cannot be taken offline for repair. The traditional method of eliminating leakage is to drill holes in the valve stuffing box and inject glue to eliminate the leak. After this method is implemented, the valve stem will not be able to open and close freely. At the same time, the pressure during glue injection is relatively high, which may easily cause leakage or even bursting in other parts of the valve. In addition, when opening holes, local cutting with a drill bit is very likely to cause fire and explosion accidents, which is extremely risky. In particular, valves that transport flammable and explosive media are basically not allowed to be treated in this way, and the cost of offline repair is extremely high. Summary of the invention

[0004] The purpose of the invention is to overcome the problem of high cost of valve offline repair in the prior art.

[0005] In order to achieve the above-mentioned objectives, the present invention provides a valve assembly on one hand, wherein the valve assembly includes a valve stem, a pressure plate sleeved on the valve stem, a stuffing box sleeved on the valve stem and located on the inner side of the pressure plate, a sealing packing is arranged between the stuffing box and the valve stem, wherein the valve assembly also includes a sealing structure arranged on the outer side of the pressure plate, the sealing structure includes a clamp sleeved on the valve stem, an additional packing arranged between the clamp and the valve stem, a pressing piece arranged on the outer side of the additional packing, a screw rod passing through the pressing piece and connected to the pressure plate, a nut is arranged on the part of the screw rod located on the outer side of the pressing piece, and the sealing structure is arranged: by tightening the nut, the pressing piece can be moved toward the additional packing to compress the additional packing.

[0006] In some embodiments, the pressing member is plate-shaped, and a boss is provided on a side of the pressing member facing the additional filler, and the boss can extend between the clamp and the valve stem.

[0007] In some embodiments, the pressing member is provided with a through hole for accommodating the valve stem to pass through, and the boss is arranged around the through hole.

[0008] In some embodiments, the pressing member includes two plates, each of which is provided with a half of the through hole, and the two plates are connected by bolts.

[0009] In some embodiments, the clamp includes a first half ring and a second half ring that are detachably connected to each other.

[0010] In some embodiments, a protrusion is provided on the connecting end surface of the first half ring, and the width of the protrusion in the radial direction gradually increases in the direction away from the connecting end surface of the first half ring. A groove is provided on the connecting end surface of the second half ring, and the groove can accommodate the protrusion.

[0011] In some embodiments, the valve assembly can be configured as follows: the clamp is sleeved on the valve stem, additional filler is filled between the clamp and the valve stem, the clamping piece is sleeved on the valve stem, and the screw is set on the pressure plate; then the nut is tightened on the screw so that the clamping piece presses the additional filler; additional filler is supplemented between the clamp and the valve stem, and the supplemented additional filler is compressed again by the clamping piece, and the above steps are repeated until the additional filler fills the space between the clamp and the valve stem.

[0012] In some embodiments, the screw is threadedly connected to the pressure plate.

[0013] In some embodiments, a handle is provided at one end of the valve stem away from the pressure plate.

[0014] On the other hand, the present solution provides a delivery pipeline, wherein the delivery pipeline includes a pipe fitting and the valve assembly described in the above solution.

[0015] Through the above technical solution, the added sealing structure can form a seal for the valve stem again on the outside of the original sealing packing without dismantling the original structure. It has a simple structure and is easy to install, and can effectively solve the leakage problem after the online valve seal fails. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a partial cross-sectional view of a valve assembly according to an embodiment of the present invention;

[0017] Figure 2 It is a schematic structural diagram of a pressing member in an implementation scheme of the present invention;

[0018] Figure 3 It is a schematic diagram of the structure of the clamp in the implementation mode of this scheme.

[0019] Description of Reference Numerals

[0020] 1 stem 2 pressure plate

[0021] 3 stuffing box 4 sealing packing

[0022] 5 clamping piece 6 screw

[0023] 7 Clamp 8 Additional filler

[0024] 9 nut 10 boss

[0025] 11 bump 12 groove DETAILED DESCRIPTION

[0026] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0027] In the present invention, unless otherwise specified, directional words such as "inside" and "outside" refer to the relative positional relationship between the inside and outside of the valve.

[0028] refer to Figure 1-Figure 3 As shown, the present scheme provides a valve assembly, wherein the valve assembly includes a valve stem 1, a pressure plate 2 sleeved on the valve stem 1, a stuffing box 3 sleeved on the valve stem 1 and located on the inner side of the pressure plate 2, a sealing packing 4 is arranged between the stuffing box 3 and the valve stem 1, wherein the valve assembly also includes a sealing structure arranged on the outer side of the pressure plate 2, the sealing structure includes a clamp 7 sleeved on the valve stem 1, an additional packing 8 arranged between the clamp 7 and the valve stem 1, a pressing piece 5 arranged on the outer side of the additional packing 8, a screw 6 passing through the pressing piece 5 and connected to the pressure plate 2, a nut 9 is arranged on the part of the screw 6 located on the outer side of the pressing piece 5, and the sealing structure is arranged: by tightening the nut 9, the pressing piece 5 can be moved toward the additional packing 8 to compress the additional packing 8.

[0029] The pressure plate 2, stuffing box 3 and sealing packing 4 are the original structure of the valve, which are used to seal the valve stem 1 extending from the inside of the valve. Figure 1 The lower side of the middle pressure plate 2 is the interior of the valve.

[0030] A sealing structure is added to the outer side of the pressure plate 2, which includes a clamp 7 sleeved on the valve stem 1. The annular space between the clamp 7 and the valve stem 1 is used to accommodate an additional packing 8. A clamping piece 5 is also provided on the outer side of the clamp 7. The clamping piece 5 can move toward the pressure plate 2 through the cooperation of the screw 6 and the nut 9, so as to press the additional packing on the outer side of the pressure plate 2, so that the additional packing 8 is tightly surrounded by the valve stem 1, thereby repairing the leakage problem after the original sealing packing fails.

[0031] In this solution, the added sealing structure can form a seal for the valve stem again on the outside of the original sealing packing without dismantling the original structure. It has a simple structure and is easy to install, and can effectively solve the leakage problem after the online valve seal fails.

[0032] The clamping member 5 is plate-shaped, and a boss 10 is provided on the side of the clamping member 5 facing the additional packing 8, and the boss 10 can extend between the clamp 7 and the valve stem 1. The clamping member 5 can be a plate-shaped structure, and a boss 10 is provided on the surface of the side facing the pressure plate 2. The boss 10, as a protruding structure, can extend between the clamp 7 and the valve stem 1, thereby compressing the additional packing 6 between the clamp 7 and the valve stem 1, so that the additional packing 6 can be tightly sealed in the space between the valve stem 1 and the pressure plate 2. It should be noted that after the clamp 7 and the valve stem 1 are placed with the additional packing 8, the additional packing 8 is in a relatively loose state. Therefore, the additional packing 8 can be squeezed by the boss 10 on the clamping member 5, so that it forms a more compact state and fits tightly with the pressure plate 2 and the valve stem 1 to form a seal.

[0033] The pressing member 5 is provided with a through hole for accommodating the valve stem 1 to pass through, and the boss 10 is arranged around the through hole. Figure 2 As shown, the clamping member 5 is generally formed as a strip plate, with a through hole formed in the middle position, and the through hole accommodates the valve stem 1 to pass through, and the valve stem 1 can support the clamping member 5; the boss 10 is annular around the through hole to match the annular space between the clamp 7 and the valve stem 1, so that the additional filler 8 therein can be squeezed more fully and comprehensively.

[0034] Furthermore, the clamping member 5 includes two plates, each of which is provided with half of the through hole, and the two plates are connected by bolts. The two plates of the clamping member 5 can be first arranged around the valve stem 1 through half of the through hole, and the arranged position is near the predetermined installation position, and then the two plates are connected by bolts, without the need to be sleeved from the end of the valve stem 1, and will not interfere with other structures at the end of the valve stem 1, such as the handle 13 described below.

[0035] The clamp 7 includes a first half ring and a second half ring which are detachably connected to each other. The two half rings can be respectively arranged around the valve stem 1 from the side of the valve stem 1, and then the two half rings are connected together, that is, the clamp 7 does not need to be sleeved from the end of the valve stem 1, so as to avoid interference with other structures at the end of the valve stem 1.

[0036] Specifically, refer to Figure 3As shown, a protrusion 11 is provided on the connection end face of the first half ring, and the width of the protrusion 11 in the radial direction gradually increases in the direction away from the connection end face of the first half ring, and a groove 12 is provided on the connection end face of the second half ring, and the groove 12 can accommodate the protrusion 11. The cooperation between the protrusion 11 and the groove 12 can realize the detachable connection of the two half rings, refer to Figure 3 As shown, in the cross section perpendicular to the axial direction, the width of the protrusion 11 in the radial direction gradually increases, and the groove 12 has a corresponding shape, which makes it impossible for the protrusion 11 to move in other directions perpendicular to the axial direction when it is accommodated in the groove 12, thereby realizing the interlocking of the two half rings; of course, the protrusion 11 can move in the groove 12 along the axial direction to allow the protrusion 11 to be installed in the groove 12.

[0037] The valve assembly can be configured as follows: the clamp 7 is sleeved on the valve stem 1, additional filler 8 is filled between the clamp 7 and the valve stem 1, the pressing piece 5 is sleeved on the valve stem 1, and the screw 6 is arranged on the pressing plate 2; then the nut 9 is tightened on the screw 6 so that the pressing piece 5 presses the additional filler 8; additional filler 8 is supplemented between the clamp 7 and the valve stem 1, and the supplemented additional filler 8 is compressed again by the pressing piece 5, and the above steps are repeated until the additional filler 8 fills the space between the clamp 7 and the valve stem 1. In other words, it is necessary to fill the additional filler 8 between the clamp 7 and the valve stem 1 in multiple times, and the loose additional filler 8 is squeezed into a dense state by the pressing piece 5 to improve its sealing performance. When the additional filler 8 between the clamp 7 and the valve stem 1 fills the clamp 7, the additional filler 8 is no longer filled.

[0038] The screw rod 6 is screwed to the pressing plate 2. The screw rod 6 is detachably connected to the pressing plate 2, for example, screwed.

[0039] In addition, a handle 13 is provided at one end of the valve stem 1 away from the pressure plate 2. The handle 13 is an operating structure of the valve stem 1, which is convenient for driving the valve stem 1 to rotate.

[0040] On the other hand, the present invention provides a delivery pipeline, wherein the delivery pipeline comprises a pipe fitting and the valve assembly described in the above embodiment. The valve assembly is installed on the pipe fitting to control the connection and disconnection of the pipeline.

[0041] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various specific technical features in any suitable manner. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A valve assembly, characterized in that: The valve assembly comprises a valve stem (1), a pressure plate (2) sleeved on the valve stem (1), a stuffing box (3) sleeved on the valve stem (1) and located on the inner side of the pressure plate (2), a sealing stuffing (4) being arranged between the stuffing box (3) and the valve stem (1), wherein the valve assembly further comprises a sealing structure arranged on the outer side of the pressure plate (2), the sealing structure comprising a clamp (7) sleeved on the valve stem (1), an additional stuffing (8) arranged between the clamp (7) and the valve stem (1), a pressing piece (5) arranged on the outer side of the additional stuffing (8), a screw (6) passing through the pressing piece (5) and connected to the pressure plate (2), a nut (9) being arranged on the part of the screw (6) located on the outer side of the pressing piece (5), and the sealing structure being arranged such that by tightening the nut (9), the pressing piece (5) can be moved toward the additional stuffing (8) to press the additional stuffing (8).

2. The valve assembly according to claim 1, characterized in that The pressing piece (5) is plate-shaped, and a boss (10) is provided on the side of the pressing piece (5) facing the additional filler (8), and the boss (10) can extend between the clamp (7) and the valve stem (1).

3. The valve assembly according to claim 2, characterized in that The pressing member (5) is provided with a through hole for accommodating the valve stem (1) to pass through, and the boss (10) is arranged around the through hole.

4. The valve assembly according to claim 3, characterized in that The pressing member (5) comprises two plate members, each of which is provided with half of the through hole, and the two plate members are connected by bolts.

5. The valve assembly according to claim 1, characterized in that The clamp (7) comprises a first half ring and a second half ring which are detachably connected to each other.

6. The valve assembly according to claim 5, characterized in that A protrusion (11) is arranged on the connection end surface of the first half ring, and the width of the protrusion (11) in the radial direction gradually increases in a direction away from the connection end surface of the first half ring. A groove (12) is arranged on the connection end surface of the second half ring, and the groove (12) can accommodate the protrusion (11).

7. The valve assembly according to claim 6, characterized in that The valve assembly can be configured as follows: the clamp (7) is sleeved on the valve stem (1), additional filler (8) is filled between the clamp (7) and the valve stem (1), the pressing piece (5) is sleeved on the valve stem (1), and the screw (6) is arranged on the pressure plate (2); then the nut (9) is tightened on the screw (6) so that the pressing piece (5) presses the additional filler (8); additional filler (8) is supplemented between the clamp (7) and the valve stem (1), and the supplemented additional filler (8) is compressed again by the pressing piece (5), and the above steps are repeated until the additional filler (8) fills the space between the clamp (7) and the valve stem (1).

8. The valve assembly according to claim 1, characterized in that The screw rod (6) is screwed to the pressing plate (2).

9. The valve assembly according to claim 1, characterized in that A handle (13) is provided at one end of the valve stem (1) away from the pressure plate (2).

10. A delivery pipeline, characterized in that: The delivery pipeline comprises a pipe fitting and a valve assembly according to any one of claims 1-9.

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