Fluid valve with anti-stall adjustment guide

Abstract

Fluid valves having anti-stiction adjustment guides are disclosed. An example valve includes a valve body including a fluid inlet, a fluid outlet, and a fluid passageway extending between the fluid inlet and the fluid outlet; a plug disposed in the fluid passageway; and an adjustment guide positioned between the plug and the valve body between the plug and the valve body, the adjustment guide including at least one balance passageway for guiding trapped process fluid into or out of a region between the plug and a valve cover of the valve during movement of the plug.

Description

Technical Field

[0001] This disclosure relates to fluid valves, and more specifically to fluid valves having anti-stagnation adjustment guides. Background Technology

[0002] Processing systems typically include industrial fluid valves with plugs that move relative to a valve seat via a valve stem to alter the flow rate of the fluid passing through them. Fluid valves designed for specific applications (such as urea production) offer resistance to high pressure drops and crystallization, in addition to minimizing vibration, noise, and clogging that may occur with valves not used for urea pressure reduction applications. Summary of the Invention

[0003] The example valve includes a valve body having a fluid inlet, a fluid outlet, and a fluid passage extending between the fluid inlet and the fluid outlet. The example valve also includes a plug disposed in the fluid passage and an adjustment guide positioned between the plug and the valve body, the adjustment guide including at least one balancing opening for guiding trapped process fluid into or out of an area between the plug and the valve cover during plug movement.

[0004] The example valve includes a valve body having a fluid inlet, a fluid outlet, and a fluid passage extending between the fluid inlet and the fluid outlet. The example valve also includes a plug disposed in the fluid passage and an adjustment guide positioned between the plug and the valve body, the adjustment guide including at least one release notch to prevent process fluid from being trapped between the adjustment guide and the valve body.

[0005] One example device includes an anti-stagnation adjustment guide configured to be disposed between a valve plug and a valve body. The anti-stagnation adjustment guide includes at least one release slit for preventing process fluid stagnation and at least one balancing opening for guiding trapped process fluid into or out of the area between the valve plug and the valve cover. Attached Figure Description

[0006] Figure 1A This is a top view of the valve cover located on the valve body.

[0007] Figure 1B yes Figure 1A A perspective side view of the valve cover and valve body.

[0008] Figure 1C yes Figure 1A and Figure 1B The cross-sectional view of the valve cover and valve body, including the cross-sectional view of the first adjustment guide.

[0009] Figure 2A yes Figure 1C The first adjustment guide is shown in the bottom view.

[0010] Figure 2B yes Figure 1C and Figure 2A The first adjustment guide's side view.

[0011] Figure 2C yes Figure 1C , Figure 2A and Figure 2B The first adjustment guide section view.

[0012] Figure 2D yes Figure 2B The side view of the first adjustment guide shown includes a balancing opening.

[0013] Figure 3A This is a cross-sectional view of the release cut within the second adjustment guide.

[0014] Figure 3B It includes Figure 3A The side view of the second adjustment guide of the release cut.

[0015] Figure 4A yes Figure 3A and Figure 3B The top view of the second adjustment guide.

[0016] Figure 4B yes Figure 3B The second adjustment guide section view.

[0017] Figure 5 It is located inside the valve body. Figure 4A The second adjustment guide section view.

[0018] The accompanying drawings are not to scale. Instead, the thickness of layers or areas may be enlarged in the drawings. Generally, the same reference numerals are used throughout the drawings and in the accompanying written description to denote the same or similar parts. Detailed Implementation

[0019] Pressure reducing valves are used in a variety of applications to allow pressure reduction (e.g., from high pressure to low pressure). Therefore, pressure reducing valves are designed to allow for high pressure drops and can be used in applications such as urea pressure reduction or decoking. In urea production, pressure reducing valves can also be designed to allow for crystallization. Urea is a chemical reactant and precursor commonly used in the production of plastics, paper, fertilizers, and resins. Urea pressure reduction processes can occur near the end of a production cycle and typically involve using a pressure reducing valve to lower the pressure. Urea pressure reducing valves are exposed to potentially corrosive particles present during urea flow through the valve. Stagnation of the fluid can occur between the valve plug and valve body during high-speed flow of urea through the pressure reducing valve, leaving urea deposits. Stagnant flow can occur between the guide surfaces of the sliding valve stem adjustment element. For example, the main guide surface includes the area between the valve body and the column guide of the valve plug. These surfaces must be maintained to ensure the functionality of the plug-stem assembly. Known techniques for preventing fluid and / or deposit buildup due to stagnation include the need for flushing connections in the steam line. This type of steam line can be used for flushing between the liner and the plug, but it does not provide continuous anti-stagnation and introduces additional leakage paths.

[0020] The fluid valve with an anti-stagnation adjustment guide disclosed herein can be used to prevent process fluid from stagnating along the guide surface of a sliding valve stem adjuster in pressure reducing valves and / or decoking valves. For example, the anti-stagnation adjustment guide may include multiple balancing passages to allow trapped fluid to enter and / or escape from a region behind the valve plug during its stroke. The anti-stagnation adjustment guide disclosed herein allows fluid to pass freely through the guide surface of the sliding valve stem adjuster, thereby balancing the pressure in a region behind the valve plug where process fluid stagnation would otherwise occur. For example, during plug movement, trapped process fluid can enter or exit the region between the plug and the valve cover by means of the anti-stagnation adjustment guide disposed between the valve plug and the valve body.

[0021] Figure 1A This is a top view of an example valve cover 102 located on the valve body 132 of valve 106. The valve cover 102 provides a cover for an opening in the valve body 132 and can be attached to the valve body 132 using threads, bolts, and / or welded joints. The valve cover 102 couples the valve body 132 to an actuator (e.g., a pneumatic actuator). Once internal components (e.g., rods, plugs, etc.) are positioned within the valve body 132, the valve cover 102 can be attached to the valve body 132. Figure 1A In the example, the first section line 104 indicates Figure 1C The example depicts the position of the top-down section of the valve body 132.

[0022] exist Figure 1BIn the example perspective side view, valve 106 is shown including a valve cover 102, an example valve stem 128, and an example valve body 132. Once the valve cover 102 is attached to the valve body 132, the valve cover 102 retains components of the valve internals within the valve body 132. The valve internals may include internal components of valve 106 (e.g., valve plug, valve seat, cage, stem, etc.) that control fluid flow between the inlet and outlet of valve 106.

[0023] Figure 1C It shows Figure 1A and Figure 1B Valve 106 along Figure 1A Example cross-sectional view of the first section line 104. Figure 1C In the example, rod 128 operatively couples example valve plug 134 to an actuator (not shown). Valve plug 134 can have any type of construction to alter the flow rate of fluid through example passage 140 of valve 106, from example inlet 136 to example outlet 138. In the example shown, fluid flows through fluid flow passage 140 in an upward orientation. Figure 1C In the example, the adjustment guide 152 is located between the rod 128 and the valve body 132. Figure 1C In the example, the adjustment guide 152 includes a center bore to guide the rod 128 during the stroke of the valve 106. The adjustment guide 152 may also include at least one release slit to prevent process fluid from being trapped between the adjustment guide 152 and the valve body 132, as in combination. Figures 2A-2C A more detailed description.

[0024] Figure 2A yes Figure 1C An example bottom view of the first adjustment guide 152. The first adjustment guide 152 includes an example top surface 202 and an example release notch 204, which is circumferentially positioned around the body of the first adjustment guide 152 to prevent process fluid stagnation. For example, the release notch 204 may be positioned in an area around the first adjustment guide 152 in which fluid stagnation is most likely to occur in the pressure reducing valve and / or decoking valve during the valve plug 134 stroke. Figure 2A In the example, the second section line 206 represents... Figure 2C The example shows the position of the top-down cross-sectional region of the first adjustment guide 152.

[0025] Figure 2B yes Figure 2A An example side view of the first adjustment guide 152. The first adjustment guide 152 includes example release cutouts 204A, 204B, 204C, example lower passage openings 226A, 226B, 226C, an example protruding surface 228, an example lower body 232, an example upper body 233, and an example flat bottom 234. Figure 2BIn the example, the first adjustment guide 152 includes one or more release notches 204A, 204B, 204C circumferentially positioned around the upper body 233 and / or lower body 232 of the adjustment guide 152. Any number of release notches 204 can be positioned around the upper body 233 and / or lower body 232, and are not limited to this. Figure 2B The number of release cuts shown in the example. For example... Figure 1C As shown in the example, the release cutout 204 can be positioned to reduce fluid stagnation in the area between the valve body 132 and the rod 128. For example, release cutouts 204A, 204B, and 204C can support lower passage openings 226A, 226B, and 226C.

[0026] like Figure 1C As illustrated in the example, when the plug 134 is stroked, process fluid may stagnate in the area above the plug 134 (e.g., in the fluid flow passage 140). In applications where the fluid includes corrosive particles that can erode and / or damage internal valve components (e.g., the flow of urea through a urea pressure reducing valve), the presence of the lower passage openings 226A, 226B, 226C and / or the release cutouts 204A, 204B, 204C can guide fluid that would otherwise stagnate outside the area between the valve body 132 and the valve stem 128, thereby preventing the accumulation of particulate deposits (e.g., urea deposits). For example, when the valve plug 134 is stroked to allow fluid to flow from the inlet 136 to the outlet 138, process fluid may stagnate in the area within the fluid flow passage 140 above the plug 134. Figure 1C As shown in the example, the positioning of the first adjustment guide 152 allows process fluid forced into the area near the rod 128 of the plug 134 to exit via lower passage openings 226A, 226B, 226C connecting the center hole of the first adjustment guide 152 (e.g., the center hole within the adjustment guide from the flat bottom 234 of the adjustment guide to the top 202 of the adjustment guide), and to reach the fluid flow passage 140 via release cutouts 204A, 204B, 204C.

[0027] In some examples, the first adjustment guide 152 includes a protruding surface 228 (e.g., a flange) to provide a barrier between the process fluid exiting the lower passage openings 226A, 226B, 226C and the topmost region of the fluid flow passage 140 (e.g., below the valve cover 102). In some examples, the protruding surface 228 is used to secure the first adjustment guide 152 to the valve 106. In some examples, the lower body 232 of the first adjustment guide is tapered below the release cutouts 204A, 204B, 204C to remove structural constraints that would reduce the flow of process fluid from the lower passage openings 226A, 226B, 226C and / or the release cutouts 204A, 204B, 204C into the fluid flow passage 140. Figure 2B In some examples, release cutouts 204A, 204B, and 204C are shaped to cover vertical areas of the upper body 233 and / or the lower body 232. In some examples, release cutouts 204A, 204B, and 204C may extend into the lower body 232 as the upper body 233 transitions into the lower body 232. In some examples, release cutouts 204A, 204B, and 204C may comprise rectangular shapes with rounded edges. In some examples, release cutouts 204A, 204B, and 204C are pressed into the upper body 233 and / or the lower body 232 of the first adjustment guide 152 such that portions of the lower body 232 and / or the upper body 233 are removed to form release cutouts 204A, 204B, and 204C (e.g., release cutouts 204A, 204B, and 204C are engraved into the upper body 233 and / or the lower body 232).

[0028] Figure 2C Based on Figure 2A The second section line 206 Figure 1C , Figure 2A and Figure 2B An example cross-sectional view of the first adjustment guide 152. The cross-sectional view includes the top 202 of the first adjustment guide, release cutouts 204A and 204D, the lower body 232 of the first adjustment guide, the upper body 233 of the first adjustment guide, the bottom 234 of the first adjustment guide, an example center hole 252, an example first balancing passage 256, and an example second balancing passage 258. Figure 2C In the example, the center bore 252 allows the valve stem 128 to move up and down within the first adjusting guide 152 during the stroke of the valve 106. Therefore, the diameter of the center bore 252 can be determined based on the diameter of the stem 128. Figure 2C In one example, the first balancing passage 256 is fluidly coupled to the release cutout 204A, and the second balancing passage 258 is fluidly coupled to the release cutout 204D. Therefore, as the rod 128 travels upward, any process fluid moving upward within the central orifice 252 can exit via balancing passages 256, 258 and / or release cutouts 204A, 204D, and subsequently enter the fluid flow passage 140. In some examples, the diagonal orientation of the balancing passages 256, 258 allows any process fluid reaching the top region of the central orifice 252 to flow downward along the balancing passages 256, 258 without... Figure 1C Accumulation and / or stagnation occur in the area below the valve cover 102. For example, balancing passages 256, 258 may be positioned along the interior of the top surface 202 toward the lower side of the top surface 202, which is oriented toward the valve body 132. Although in Figure 2CIn the example, balancing pathways 256 and 258 are shown diagonally oriented, but balancing pathways 256 and 258 and / or release cuts 204A, 204B, 204C, and 204D may be, but are not limited to, other orientations. Figures 2A-2C Arrange in any other way as shown in the example.

[0029] Figure 2D yes Figure 2B An example side view of the first adjustment guide 152 shown includes release cutouts 204A, 204B, and 204C. Figure 2D In the example, release cutouts 204A, 204B, and 204C include lower passage openings 226A, 226B, and 226C. The lower passage openings 226A, 226B, and 226C lead to a first balancing passage 256, an example third balancing passage 278, and / or an example fourth balancing passage 280. The balancing passages 256, 278, and 280 are engaged with a central hole 252 at example upper passage openings 285, 290, and 292. Figure 2D In the example, the upper passage openings 285, 290, 292 are positioned adjacent to an example upper region 294 of the central aperture 252. The upper region 294 of the central aperture 252 may include a larger diameter compared to the rest of the central aperture 252. Thus, as fluid travels upward with the rising rod 128, exits the upper region 294 via the upper passage openings 285, 290, 292, flows downward via the balancing passages 256, 278, 280, exits via the lower passage openings 226A, 226B, 226C, and enters the fluid flow passage 140 via the release cuts 204A, 204B, 204C, the upper region 294 can provide a larger area to receive the incoming process fluid flow. Although in Figure 2D The example shows release cuts 204A, 204B, and 204C, but balance passages 256, 278, and 280 can directly exit into fluid flow passage 140.

[0030] Figure 3A This is an example cross-sectional view of the central body 302 of the example second adjustment guide, including release cutouts 304A, 304B, 304C, and 304D within the example second adjustment guide 305. Although in Figure 3A The example shows a total of four release notches 304A, 304B, 304C, and 304D, but any number of release notches may be included in the second adjustment guide 305. The first and / or second adjustment guides 152 and 305 may be used in pressure reducing valves and / or decoking valves to prevent and / or reduce fluid stagnation between the valve cover 102 and the valve body 132.

[0031] Figure 3B It includes Figure 3AAn example side view of the second adjustment guide 305 with release cutouts 304A, 304B. The second adjustment guide 305 includes an example upper region 352 for securing the second adjustment guide 305 to the valve cover 102. For example, the upper region 352 includes attachment points 354A, 354B to provide a threaded, bolted, and / or welded connection to the cover 102. The upper region 352 also includes example upper passage openings 356A, 356B and an example lower passage opening 358. Figure 3B In the example, as the rod 128 rises within the central hole 370 of the second adjusting guide 305, the fluid can exit the central hole 370 via the upper passage openings 356A, 356B and through the lower passage opening (e.g., lower passage opening 358). Figure 3B As shown in the example, each upper passage opening (e.g., upper passage openings 356A, 356B) includes a corresponding lower passage opening to allow fluid to pass through a balancing passage within the second adjusting guide 305, such as... Figure 4B As shown in the example. The second adjustment guide 305 also includes an example middle region 360, an example first tapered region 362, an example elongated region 364, an example second tapered region 366, and an example bottom region 368. Figure 3B In the example, the intermediate region 360 includes a first cross-sectional diameter, the central body 302 includes a second cross-sectional diameter, the elongated region 364 includes a third cross-sectional diameter, and the second tapering region 366 includes a fourth cross-sectional diameter. For example, release cutouts 304A and 304B extend along the second cross-sectional diameter of the adjusting guide 305 (e.g., the second cross-sectional diameter forming the central body 302). Figure 3B In the example, the diameter of the second cross-section (e.g., forming the central body 302) is greater than (1) the diameter of the first cross-section (e.g., forming the intermediate region 360), (2) the diameter of the third cross-section (e.g., forming the elongated region 364), and (3) the diameter of the fourth cross-section (e.g., forming the second tapered region 366). However, the cross-sectional diameters of the central body 302, the intermediate region 360, the elongated region 364, and / or the second tapered region 366 are not limited to... Figure 3B The relative diameters are shown in the example. For example, in Figure 3B In this configuration, the cross-sectional diameter can be adjusted to decrease in downward length along the second adjustment guide 305 to allow for an increase in the process fluid outflow area below the lower passage opening (e.g., lower passage opening 358). In some examples, the cross-sectional diameter can be adjusted to allow for proper positioning of a given valve (e.g., a urea pressure reducing valve and / or a decoking valve, etc.), such as in combination with... Figure 5As shown. In some examples, the cross-sectional area can be adjusted to allow process fluid to flow out from the lower passage opening (e.g., lower passage opening 358) toward the release cuts 304A, 304B, and further down into the fluid flow passage 140.

[0032] Figure 4A yes Figure 3A and Figure 3B An example top view of the second adjustment guide 305. The top view of the second adjustment guide 305 includes an upper region 352 for threaded, bolted, and / or welded connections of the second adjustment guide 305 to attachment points 354A, 354B of the valve cover 102, and upper passage openings 356A, 356B, 356C, 356D. Although in Figure 4A The example contains a total of two attachment points 354A, 354B and a total of four upper passage openings 356A, 356B, 356C, 356D, but any number of attachment points and / or passage openings can be used based on, for example, the expected size of the second adjustment guide 305 and / or the expected application (e.g., pressure reducing valve, decoking valve, etc.). Figure 4A In the example, the third section line 410 is shown to indicate Figure 4B The example shows the top-down cross-sectional area of ​​the second adjustment guide 305.

[0033] Figure 4B Based on Figure 4A The third section line 410 Figure 3B Example cross-sectional view of the second adjusting guide 305. Figure 4B In the middle, the second adjustment guide 305 includes a position on either side of the second adjustment guide 305. Figure 3B Release incisions 304A and 304C. Figure 4B The second adjustment guide 305 also includes Figure 4A The upper region 352 and upper passage openings 356B, 356D. Fluid flowing downward from the upper passage openings 356B, 356D exits at the lower passage openings 358, 451, thus passing through example balancing passages 452A, 452B. Balancing passages 452A, 452B are diagonally positioned to allow fluid flow away from the second adjustment guide 305 and into the fluid flow passage 140 via release cutouts 304A, 304C. This cross-sectional view also shows the variation of example cross-sectional region 453 along the entire length of the second adjustment guide 305. For example, the intermediate region 360, the first tapered region 362, the elongated region 364, and the second tapered region 366 have varying cross-sectional diameters. Figure 4BIn some examples, the cross-sectional diameter of the intermediate region 360 is larger than that of each of the elongated region 364 and the second tapering region 366. In some examples, the reduced cross-sectional diameter of the second adjustment guide 305 provides fixed positioning of the second adjustment guide 305 within a given valve (e.g., a decoking valve, a pressure reducing valve, etc.). In some examples, the reduced cross-sectional diameter of the second adjustment guide 305 allows for an increased contact area between the fluid and the fluid flow passage 140 as fluid exits from release ports 304A, 304C. For example, Figure 4B The second adjustment guide 305 includes an example central aperture 370 connecting the bottom region 368 to the upper region 352. Any process fluid present in the central aperture 370 can exit the second adjustment guide 305 via balancing passages 452A, 452B and enter a fluid flow passage 140 positioned below release cutouts 304A, 304C, as in combination. Figure 5 Further description.

[0034] Figure 5 It is located within the valve body 132 of the example valve 500. Figure 4A Example cross-sectional view of the second adjusting guide 305. Figure 5 In the example, the second adjustment guide 305 is located inside the valve body 132, below the valve cover 102. For example, the second adjustment guide 305 can be fixedly coupled to the valve body 132. Figure 5 In the example, the valve cover 102 is secured to the valve body 132 using example threaded, bolted and / or welded joints 501A, 501B. Figure 5 The cross-sectional view of the second adjustment guide 305 shown corresponds to Figure 4B The cross-sectional view of valve body 132 includes an example plug 506, an example valve seat 508, an example inlet 510, an example fluid flow path 512, and an example outlet 514. Figure 5In the example, plug 506 is attached to valve stem 128 to operatively couple plug 506 to an actuator, allowing plug 506 to move up / down along the central bore 370 of the second adjustment guide 305, thereby altering the rate of fluid through valve 500. Valve seat 508 may include a support ring to provide a support surface for plug 506 and help regulate the flow rate of fluid through valve 500. As plug 506 moves away from valve seat 508, process fluid enters fluid flow passage 512 from inlet 510. The process fluid then flows to outlet 514 of valve 500. However, during high-speed flow of process fluid through valve 500 (e.g., urea pressure reducing valve, decoking valve, etc.), fluid stagnation may occur between plug 506 and valve body 132 (e.g., between the guide surfaces of the sliding valve stem adjustment). In applications requiring the handling of potentially corrosive process fluids such as urea, stagnant process fluid may leave urea deposits. The main guiding surfaces that can experience this fluid stagnation include the area between the valve body 132 and the column guide of the valve plug 506. Failure to maintain these surfaces will impair the function of the plug rod assembly.

[0035] exist Figure 5 In the example, the second adjustment guide 305 provides an outlet point for stagnating the fluid during high-speed process fluid flow through valve 500. For example, any process fluid entering the central orifice 370 can exit via balancing passages 452A, 452B and flow toward release cutouts 304A, 304C by passing between valve body 132 and intermediate region 360. Once the process fluid has entered release cutouts 304A, 304C, the process fluid can exit into fluid flow passage 512 by passing between valve body 132 and first tapered region 362. The remaining region of the second adjustment guide 305 (e.g., elongated region 364, second tapered region 366, and / or bottom region 368) forms the remainder of the central orifice 370 region, within which a plug 506 is positioned such that the plug 506 is movable relative to the second adjustment guide 305 along the longitudinal axis of the adjustment guide 305.

[0036] As can be understood from the above, the fluid valve with anti-stagnation adjustment guide disclosed herein prevents process fluid in pressure reducing valves and / or decoking valves from stagnating along the guide surface of the sliding valve stem adjustment member. In the example disclosed herein, the anti-stagnation adjustment guide may include a balancing passage to allow trapped fluid to enter and / or escape from a region behind the valve plug during the valve plug's stroke. Therefore, trapped process fluid can thus enter or exit the region between the valve plug and the valve cover during the movement of the plug using the anti-stagnation adjustment guide disposed between the valve plug and the valve body.

[0037] Although certain example methods, apparatuses, and systems have been disclosed herein, the scope of this patent is not limited thereto. Rather, this patent covers all methods, apparatuses, and articles of manufacture that fall entirely within the scope of the claims of this patent.

Claims

1. A valve, comprising: A valve body, the valve body including a fluid inlet, a fluid outlet, and a fluid passage extending between the fluid inlet and the fluid outlet; A plug, wherein the plug is disposed in the fluid passage; as well as An adjustment guide is positioned between the plug and the valve body. The adjustment guide includes at least one balancing passage for guiding trapped process fluid into or out of the region between the plug and the valve cover during movement of the plug. The at least one balancing passage is diagonally positioned between the underside of the top surface of the adjustment guide and a release cutout. The adjustment guide includes a release cutout circumferentially positioned around the body of the adjustment guide.

2. The valve according to claim 1, wherein, The adjustment guide includes a central hole within the adjustment guide that guides the rod of the plug during the stroke of the valve.

3. The valve according to claim 1, wherein, The at least one balancing passage is positioned along the interior of the top surface of the adjusting guide toward the lower side of the top surface, the lower side of the top surface being oriented toward the valve body.

4. The valve according to claim 1, wherein, The valve is a pressure reducing valve or a decoking valve.

5. The valve according to claim 1, wherein, The release notch prevents process fluid from stagnating between the plug and the valve cover.

6. The valve according to claim 3, wherein, The main body of the adjustment guide includes a surface having a first cross-sectional diameter, a second cross-sectional diameter, a third cross-sectional diameter, and a fourth cross-sectional diameter.

7. The valve according to claim 6, wherein, The release cut extends along the second cross-sectional diameter of the adjustment guide.

8. The valve according to claim 6, wherein, The diameter of the second cross section is greater than the diameter of the first cross section, the diameter of the third cross section, or the diameter of the fourth cross section.

9. A valve comprising: A valve body, the valve body including a fluid inlet, a fluid outlet, and a fluid passage extending between the fluid inlet and the fluid outlet; A plug, wherein the plug is disposed in the fluid passage; as well as An adjustment guide is positioned between the rod of the plug and the valve body. The adjustment guide includes at least one release slit to prevent process fluid from being trapped between the adjustment guide and the valve body. The adjustment guide includes a balancing passage positioned diagonally toward the underside of the top surface of the adjustment guide. The adjustment guide includes a release slit circumferentially positioned around the body of the adjustment guide.

10. The valve according to claim 9, wherein, The adjustment guide includes a central hole within the adjustment guide for guiding the rod of the plug during the stroke of the valve.

11. The valve according to claim 9, wherein, The valve is a decoking valve or a pressure reducing valve.

12. The valve according to claim 9, wherein, Each release slit extends from the surface of the adjustment guide, the surface having a first cross-sectional diameter and a second cross-sectional diameter different from the first cross-sectional diameter.

13. The valve according to claim 12, wherein, The diameter of the first cross-section is larger than the diameter of the second cross-section.

14. An apparatus including an anti-stagnation adjustment guide, wherein the anti-stagnation adjustment guide is configured between a valve plug and a valve body, the anti-stagnation adjustment guide including at least one release slit for preventing process fluid stagnation, the anti-stagnation adjustment guide including at least one balancing passage for guiding trapped process fluid into or out of a region between the valve plug and the valve cover, the at least one balancing passage being positioned diagonally toward the underside of the top surface of the adjustment guide, wherein at least two release slits are circumferentially positioned around the body of the anti-stagnation adjustment guide.

15. The apparatus according to claim 14, wherein, The valve plug is movable relative to the anti-stagnation adjustment guide along the longitudinal axis of the anti-stagnation adjustment guide.

16. The apparatus according to claim 14, wherein, The anti-stagnation adjustment guide is fixedly coupled to the valve body.

17. The apparatus according to claim 14, wherein, The anti-stagnation adjustment guide includes a central hole within the anti-stagnation adjustment guide, the central hole guiding the rod of the valve plug during the valve's stroke.

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