Pneumatic high-temperature jacketed wear-resistant regulating valve

Abstract

The utility model discloses a kind of pneumatic high-temperature jacket wear-resistant regulating valve, it is related to valve field, including valve body, valve stem, valve cover, valve core, valve seat, packing assembly and actuating mechanism, the valve body is externally provided with fixed installation's jacket, the jacket is spaced apart and is formed between valve body and the cavity for heating medium circulation, the cavity completely wraps valve body and packing assembly, the valve stem and valve core adopt integrated structure, the diameter of the valve core at the inner cavity of valve body is same with the diameter of valve stem at corresponding packing assembly place. The utility model has the advantages of good work reliability, long service life.

Description

Technical Field

[0001] This utility model relates to the field of valves, specifically to a pneumatic high-temperature jacketed wear-resistant regulating valve. Background Technology

[0002] In the production processes of industries such as oil refining, chemical industry, and coal chemical industry, there are often high-temperature, high-pressure differential, solid-containing and easily solidified media transportation and regulation conditions, such as residual oil and coal tar in residual oil hydrogenation units and coal liquefaction units. These media are usually between 300 and 500°C, with working pressure differentials of 10 to 20 MPa, and contain a certain amount of solid particles. At the same time, they are very easy to solidify when the temperature drops.

[0003] When pneumatic control valves are used under the above conditions, the following technical defects are common: the medium is prone to solidification, which leads to valve jamming and packing failure; the erosion of solid media leads to damage to the valve core and valve seat; damage to the valve body and pipeline; and the valve service life is generally short. Existing pneumatic control valves used under the above operating conditions have valve bodies with thermal insulation jackets, but these jackets fail to cover the packing area, or the packing has a separate heating device, resulting in a complex structure; the packing assembly is mostly composed of a single type of sealing ring or packing and flexible graphite ring; the valve stem and valve core are separate, and are mostly fixed by mechanical connection using threads, pins or interference fits, with one or more steps in the part placed in the valve cavity; the throttling surface of the valve core is mostly flat or simple curved; the valve seat is of the non-extended type or has a short extension that covers the valve body flow, and the valve seat sealing surface is mostly stainless steel inlaid with hard alloy; Existing pneumatic control valves generally suffer from the following technical defects when used under the above operating conditions: First, the medium is prone to solidification. Some existing control valves with heating functions only heat the valve body cavity, without covering the packing area. This results in a lower temperature at the packing area, causing the medium to solidify and adhere between the valve stem and the packing, causing valve jamming, affecting the control accuracy, or even preventing normal opening and closing. Second, there is the problem of valve core erosion. Most existing valve cores and valve stems are connected separately, and there is a stepped structure between the valve core and valve stem. Solid particles in the medium tend to accumulate at the steps, exacerbating erosion. At the same time, the connection points of the separate structure are prone to erosion under high pressure differential conditions. The following issues arise: First, loosening can lead to seal failure. Furthermore, existing valve core throttling surfaces are mostly planar or simple curved surfaces, making the fluid prone to dispersion and turbulence under high pressure differentials, further exacerbating erosion. Second, there is erosion of the valve body and pipeline. Existing valve seats are mostly conventional structures that cannot cover the gaps between the valve body flow channel and the pipeline flange. Solid media under high pressure differentials can cause severe erosion of the valve body flow channel and pipeline substrate at the gaps between the valve flange and the uncovered wear-resistant valve seat, shortening the service life of the valve and pipeline. Third, poor sealing performance. Existing packing assemblies are mostly single-type sealing rings. Media solidified on the valve stem can damage the packing seal performance, causing media leakage.

[0004] To address the aforementioned problems, there is an urgent need for a pneumatic control valve that can simultaneously resolve issues such as medium solidification, valve core erosion, valve body and pipeline erosion, and seal failure. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, this utility model provides a pneumatic high-temperature jacket wear-resistant regulating valve with good working reliability and long service life.

[0006] The technical solution adopted in this utility model is as follows: a pneumatic high-temperature jacketed wear-resistant regulating valve, including a valve body, valve stem, valve cover, valve core, valve seat, packing assembly, and actuator. A fixedly installed jacket is provided on the valve body. The jacket and the valve body are spaced apart to form a cavity for the flow of heating medium. The cavity completely encloses the valve body and the packing assembly. The top of the jacket is provided with a steam inlet and the bottom with a steam outlet. The valve stem and valve core adopt an integral structure. The diameter of the valve core located in the inner cavity of the valve body is the same as the diameter of the valve stem at the corresponding packing assembly. The cavity is equipped with a spiral guide plate.

[0007] The valve core sealing surface adopts a conical structure, and its lower end is provided with a Y-shaped or cross-shaped throttling surface. The valve seat is T-shaped, and the lower end of the valve seat extends out of the outlet of the valve body.

[0008] A bracket is provided between the upper end of the valve seat and the packing assembly.

[0009] The valve core, valve stem, and valve seat are made of Stellite 6 or WC-Co hard alloy. The valve cover is equipped with a packing pressure plate for pressing the packing assembly. The packing pressure plate and the valve cover are connected by bolts. Several sets of disc springs are provided between the bolts and the packing pressure plate to abut against each other.

[0010] The packing assembly includes a first packing layer, a second packing layer, and a spacer ring located between the first packing layer and the second packing layer. The first packing layer is made of multiple packing rings made of interlaced metal and graphite layers. The second packing layer is composed of two flexible graphite braided packing rings and a flexible graphite ring reinforced with high-temperature alloy wire. The beneficial effects of this utility model are as follows: The jacket of this technical solution is fixed to the outside of the valve body, and a reasonable distance is designed between the jacket and the valve body to form a cavity for the heating medium to flow. The heating section of the cavity completely encloses the valve body and the packing assembly to ensure uniform heating. The top of the steam jacket is provided with a steam inlet, and the bottom is provided with a steam outlet. The steam outlet is connected to a condensate discharge branch and a drain valve in series to discharge condensate in a timely manner and avoid affecting the heating effect. The interior is provided with a spiral guide plate to guide the steam to flow evenly along the cavity, further improving the heating uniformity. The insulation layer wrapped around the outer wall of the pipe and valve can further reduce heat loss. In addition, the diameter of the valve core located in the inner cavity of the valve body 1 is the same as the diameter of the valve stem at the corresponding packing assembly, and the overall outer surface is smooth without steps, which avoids the accumulation of solid particles in the medium, eliminates stress concentration at the steps, improves structural strength, and has the advantages of good working reliability and long service life. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the pneumatic high-temperature jacketed wear-resistant regulating valve according to an embodiment of this utility model.

[0012] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0013] Figure 3 This is a schematic diagram of a valve core with a Y-shaped or cross-shaped lower end. Detailed Implementation

[0014] The embodiments of this utility model will be further described below with reference to the accompanying drawings: As shown in the figure, a pneumatic high-temperature jacketed wear-resistant regulating valve includes a valve body 1, a valve stem 2, a valve cover 3, a valve core 4, a valve seat 5, a packing assembly 6, and an actuator 7. A fixedly installed jacket 8 is provided outside the valve body 1. The jacket 8 and the valve body 1 are spaced apart to form a cavity 81 for the flow of heating medium. The cavity 81 completely encloses the valve body 1 and the packing assembly 6. The jacket has a steam inlet (not shown) at the top and a steam outlet (not shown) at the bottom. The valve stem 2 and the valve core 4 are of an integral structure. The diameter of the valve core 4 located in the inner cavity of the valve body 1 is the same as the diameter of the valve stem 2 at the corresponding packing assembly 6. The jacket is fixed to the outside of the valve body, and a reasonable distance is designed between the jacket and the valve body to form a cavity for the flow of heating medium. The heating section of the cavity completely encloses the valve body and the packing assembly to ensure uniform heating. The steam jacket has a steam inlet at the top and a steam outlet at the bottom. The steam outlet is connected to a condensate drain branch and a steam trap in series to drain the condensate in a timely manner and avoid affecting the heating effect. The cavity 81 is equipped with a spiral guide plate 82 to guide the steam to flow evenly along the cavity and further improve the heating uniformity. The jacket is fixed to the outside of the valve body and is welded to the valve body using a high-temperature resistant stainless steel plate. The insulation layer that users wrap around the outer walls of pipes and valves can further reduce heat loss.

[0015] In addition, the diameter of the valve core located in the inner cavity of the valve body 1 is the same as the diameter of the valve stem at the corresponding packing assembly, and the overall outer surface is smooth without steps, which avoids the accumulation of solid particles in the medium, eliminates stress concentration at the steps, improves structural strength, and has the advantages of good working reliability and long service life. The valve core 4 has a conical sealing surface that fits tightly with the valve seat, improving sealing performance. Its lower end is provided with a Y-shaped or cross-shaped throttling surface. The throttling area is designed according to the flow regulation requirements of the working conditions. It can evenly decompose the kinetic energy of the high pressure differential fluid, achieve smooth flow, avoid fluid dispersion and turbulence, and when multiple fluids converge at the bottom of the valve core collide with each other, they offset some of the kinetic energy and reduce the flow velocity, further improving the erosion resistance. The valve seat 5 is T-shaped, and its lower end extends out of the outlet of the valve body 1. Its extended part extends along the direction of medium flow to fully cover the valve body flow channel and extends out of the valve body end into the pipeline flange channel (not shown). It covers the gap between the valve body flange and the pipeline flange (not shown) after assembly, which can prevent the medium from directly scouring the inner wall of the valve body outlet and prevent high-pressure solid medium from eroding the flange sealing ring (not shown) at the gap.

[0016] A bracket 9 is provided between the upper end of the valve seat 5 and the packing assembly 6.

[0017] The valve core 4, valve stem 2, and valve seat 5 are made of Stellite 6 or WC-Co hard alloy, which has excellent high-temperature wear resistance and corrosion resistance. The valve cover 3 is equipped with a packing pressure plate 31 for pressing the packing assembly 6. The packing pressure plate 31 and the valve cover 3 are connected by bolts 32. Several sets of disc springs 33 are provided between the bolts 32 and the packing pressure plate 31 to abut against each other. This can dynamically compensate for the packing relaxation force caused by fluctuations in pressure and temperature inside the valve.

[0018] The packing assembly 6 includes a first packing layer 61, a second packing layer 62, and a spacer ring 63 located between the first packing layer 61 and the second packing layer 62. The spacer ring is made of high-temperature resistant stainless steel. The first packing layer 61 consists of multiple packing rings made of interlaced metal and graphite layers, which can act as a brush to clean the medium adhering to the valve shaft and prevent the medium from entering the upper packing sealing area and damaging the packing. The second packing layer 62 consists of two flexible graphite braided packing rings and a flexible graphite ring reinforced with high-temperature alloy wire. The flexible graphite ensures the sealing performance, and the flexible graphite braided packing can protect the flexible graphite rings from erosion and breakage. The first packing layer is designed into the valve body and is fully covered by the steam jacket of the valve body to ensure stable temperature at the packing location and prevent the medium from solidifying.

[0019] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] Please note to all technical personnel: Although this utility model has been described according to the specific embodiments above, the inventive concept of this utility model is not limited to this utility model. Any modification that utilizes the inventive concept will be included within the scope of protection of this patent.

Claims

1. A pneumatic high-temperature jacketed wear-resistant regulating valve, comprising a valve body (1), a valve stem (2), a valve cover (3), a valve core (4), a valve seat (5), a packing assembly (6), and an actuator (7), characterized in that: The valve body (1) is provided with a fixedly installed jacket (8). The jacket (8) and the valve body (1) are spaced apart and form a cavity (81) for the flow of heating medium. The cavity (81) completely encloses the valve body (1) and the packing assembly (6). The top of the jacket is provided with a steam inlet and the bottom is provided with a steam outlet. The valve stem (2) and the valve core (4) adopt an integrated structure. The diameter of the valve core (4) located in the inner cavity of the valve body (1) is the same as the diameter of the valve stem (2) at the corresponding packing assembly (6).

2. The pneumatic high-temperature jacketed wear-resistant regulating valve according to claim 1, characterized in that: The cavity (81) is provided with a spiral guide plate (82).

3. The pneumatic high-temperature jacketed wear-resistant regulating valve according to claim 1, characterized in that: The valve core (4) has a conical sealing surface and a Y-shaped or cross-shaped throttling surface at its lower end.

4. The pneumatic high-temperature jacketed wear-resistant regulating valve according to claim 1, characterized in that: The valve seat (5) is T-shaped, and the lower end of the valve seat (5) extends out of the outlet of the valve body (1).

5. The pneumatic high-temperature jacketed wear-resistant regulating valve according to claim 1, characterized in that: A bracket (9) is provided between the upper end of the valve seat (5) and the packing assembly (6).

6. The pneumatic high-temperature jacketed wear-resistant regulating valve according to claim 1, characterized in that: The valve core (4), valve stem (2) and valve seat (5) are made of Stellite 6 or WC-Co hard alloy.

7. The pneumatic high-temperature jacketed wear-resistant regulating valve according to claim 1, characterized in that: The valve cover (3) is equipped with a packing pressure plate (31) for pressing the packing assembly (6). A bolt (32) is provided between the packing pressure plate (31) and the valve cover (3) to connect the two. A number of disc springs (33) are provided between the bolt (32) and the packing pressure plate (31) to abut against the two.

8. The pneumatic high-temperature jacketed wear-resistant regulating valve according to claim 1, characterized in that: The packing assembly (6) includes a first packing layer (61), a second packing layer (62), and a spacer ring (63) located between the first packing layer (61) and the second packing layer (62). The first packing layer (61) is made of multiple packing rings made of metal and graphite layers. The second packing layer (62) is made of two flexible graphite braided packing rings and a flexible graphite ring reinforced with high-temperature alloy wire.

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