A slide-type regulating valve

Abstract

The present invention discloses a slide-type regulating valve, comprising a valve body, an adjusting plate, a slide, and a valve stem; the valve body is provided with a medium passage and a valve cavity; the adjusting plate is assembled in the valve cavity, and a throttling window 1 is provided in the area of ​​the adjusting plate corresponding to the medium passage; the slide is assembled in the valve cavity with a linear displacement, and is located on one side of the adjusting plate; the throttling window 1 on the regulating plate is a cross-shaped throttling window structure; a throttling window 2 of the cross-shaped throttling window structure is provided on the slide, and the throttling window 2 can overlap and align with the throttling window 1 during the linear displacement of the slide; and the cross-shaped throttling window structure, corresponding to the linear displacement direction of the slide, the contour line of the bottom throttling area is a V-shaped structure with a gradually expanding curve change, and the contour line of the top throttling area is an inverted V-shaped structure with a gradually expanding curve change. The present invention forms an equal percentage flow characteristic, and has technical characteristics such as simple structure, easy molding, large flow area, easy and precise adjustment, and anti-scouring.

Description

Technical Field

[0001] The invention relates to a valve for industrial process control, in particular to a slide plate type regulating valve. Background Art

[0002] Slide-type regulating valves, based on the flat gate valve structure, feature a straight-through structure within the valve body, forming a pre-valve media channel, a valve cavity, and a post-valve media channel. A regulating plate is fixedly mounted within the valve cavity, and a sliding plate, also known as a gate, is attached to the regulating plate via the valve stem. The sliding plate's linear displacement controls the pre-valve and post-valve media channels, regulating flow. Compared to regulating valves with S-shaped media channels, slide-type regulating valves offer stable media flow and minimize erosion of the valve body.

[0003] The throttling control of the existing slide-type regulating valve is achieved by the waist-shaped sieve hole structure throttling port on the slide and the front and rear positions of the regulating plate. When the linearly displaced slide passes through the non-throttling port area and blocks the throttling port of the regulating plate, it is shut off. When the linearly displaced slide passes through the throttling port and overlaps and aligns with the throttling port of the regulating plate, it is fully opened. When the linearly displaced slide passes through the throttling port and overlaps with the throttling port of the regulating plate, throttling is achieved. For example, Chinese patent documents disclose technologies such as “A skateboard-type regulating valve” (publication number CN 209977291 U, publication date January 21, 2020), “High-pressure differential precision small-diameter skateboard regulating valve” (publication number CN205745392 U, publication date November 30, 2016), “A straight-stroke regulating valve” (publication number CN 205479428 U, publication date August 17, 2016), “A regulating valve” (publication number CN 103867736 A, publication date June 18, 2014), “A surface contact retaining mechanism and skateboard-type regulating valve” (publication number CN208595246 U, publication date March 12, 2019), and “A temporary fixing structure for a valve seat cover for a skateboard-type regulating valve” (publication number CN 208831766 U, publication date May 7, 2019).

[0004] The throttling structure of the aforementioned numerous publicly disclosed slide-type regulating valves is identical, i.e., a waist-shaped sieve structure with front and rear positions correspondingly matched. The technical problems with this throttling structure are:

[0005] 1. Due to the limitations of the waist-shaped mesh's molding rules and structural strength, the flowable area within the nominal diameter is relatively small, generally less than 40% of the nominal diameter. This indicates that the adjustable flow capacity is relatively small.

[0006] 2. The columnar arrangement of the waist-shaped sieve holes on the plate body results in a small rated valve stroke under certain conditions (stroke size directly affects the window area). To reduce the dead zone (less than 5-10% of the rated stroke), the sealing surface width is generally designed to be small (0.5-1.0mm), resulting in poor erosion resistance.

[0007] 3. When throttling, a linear flow characteristic is formed, and the valve opening at a specific flow is small, which is not conducive to precise adjustment and control;

[0008] 4. The surrounding areas between adjacent waist-shaped sieve holes on the same plate (especially the adjustment plate) serve as sealing surfaces. The sealing line segments are extremely long, which requires high manufacturing precision and high costs, but the leakage level is low (generally Class V). At the same time, there are many points of damage to the fluid medium, and the sealing performance is poor. Summary of the Invention

[0009] The technical purpose of the present invention is to provide a slide-type regulating valve with a large flow area, equal percentage flow characteristics and good erosion resistance in view of the particularity of the above-mentioned slide-type regulating valve and the shortcomings of the existing technology.

[0010] The technical purpose of the present invention is achieved through the following technical solution: a slide-type regulating valve, comprising a valve body, a regulating plate, a slide and a valve stem;

[0011] The valve body is provided with a medium channel and a valve cavity between the medium channels, and the medium channels in front of and behind the valve cavity are straight-through structures;

[0012] The regulating plate is assembled in the valve cavity of the valve body, and a throttling window 1 is opened in the area of ​​the regulating plate corresponding to the medium channel;

[0013] The slide is assembled in the valve cavity of the valve body through the valve stem in a linear displacement structure and is located on one side of the regulating plate;

[0014] The throttle window 1 on the regulating plate is a cross-shaped throttle window structure;

[0015] The slide is provided with a second throttle window of a cross-shaped throttle window structure, and during the linear displacement of the slide, the second throttle window can overlap and align with the first throttle window;

[0016] Furthermore, the cross-shaped throttling window structure, corresponding to the linear displacement direction of the slide, has a contour line of a bottom throttling area that is a V-shaped structure with a gradually expanding curve, and a contour line of a top throttling area that is an inverted V-shaped structure with a gradually expanding curve;

[0017] When the regulating valve is in a closed state, the second throttling window of the slide plate is staggered with the first throttling window of the regulating plate, and the non-throttling window area of ​​the slide plate blocks the first throttling window of the regulating plate;

[0018] When the regulating valve is in a throttling state, the throttling window 2 of the slide plate and the throttling window 1 of the regulating plate are staggered and overlapped;

[0019] When the regulating valve is in a fully open state, the second throttling window of the slide plate overlaps and aligns with the first throttling window of the regulating plate.

[0020] The slide-type regulating valve employing the aforementioned technical measures features a cross-shaped throttling window on the slide and regulating plate, with front and rear positions aligned and meeting the flow characteristics. The molding of this cross-shaped throttling window requires minimal consideration of molding rules and structural strength, resulting in minimal impact. The structure is simple and easy to form, resulting in a large flowable area within the nominal diameter, typically exceeding 50% of the nominal diameter. In other words, within the same nominal diameter, the flowable area of ​​the aforementioned technical measures is far greater than that of the waist-shaped sieve aperture throttling structure, resulting in excellent adjustable flow capacity.

[0021] Furthermore, the cross-shaped throttling window of the aforementioned technical measures creates an equal percentage flow characteristic during throttling, resulting in a wide valve opening at a specific flow rate and a large rated travel. Compared to a linear flow characteristic, the wide valve opening under the same flow conditions facilitates precise control, provides excellent erosion resistance, and maintains a strong seal.

[0022] In addition, the throttling window of the regulating plate forms a flow channel area that is basically centrally symmetrically distributed in the straight-through medium channel of the valve body. The fluid medium flows basically in a straight line in the straight-through medium channel. When the high-speed fluid medium generated by throttling flows through the throttling window of the regulating plate, it mainly flows in the central part, reducing the scattering of the high-speed fluid medium. While throttling, it plays a role in guiding the flow direction, effectively reducing the scouring and damage of the fluid medium to the rear medium channel.

[0023] As one of the preferred solutions, the regulating plate is located in the valve cavity of the valve body, relative to the flow direction of the fluid medium, at the rear side of the slide plate;

[0024] The valve cavity of the valve body is further provided with a valve seat plate located in front of the slide. The valve seat plate is pre-pressed against the slide and has a flow window corresponding to the medium channel.

[0025] When the regulating valve is in a closed state, the throttling window 2 of the slide plate is staggered with the flow window of the valve seat plate, and the non-throttling window area of ​​the slide plate blocks the flow window of the valve seat plate;

[0026] When the regulating valve is in a throttling state, the throttling window 2 of the slide plate and the flow window of the valve seat plate are staggered and overlapped;

[0027] When the regulating valve is in a fully open state, the second throttling window of the slide plate is within the coverage range of the flow window of the valve seat plate.

[0028] The above technical measures form a sequentially tight fit between the seat plate, slide plate, and adjustment plate relative to the flow direction of the fluid medium. This ensures a pre-tightened surface contact between the seat plate and slide plate, as well as between the slide plate and adjustment plate. Furthermore, the throttle window on the slide plate is protected by the seat plate and adjustment plate, preventing particles in the fluid medium from entering the valve cavity, thus ensuring valve control stability and reliable throttling flow characteristics.

[0029] Secondly, a flat gate valve-type, cuttable sealing pair, i.e., the main sealing structure, is formed between the valve seat plate and the slide plate, and an equal percentage flow characteristic regulating pair, i.e., a regulating and auxiliary sealing structure, is formed between the slide plate and the regulating plate. The sealing pair is separated from the throttling pair, which can effectively reduce the scouring damage of the fluid medium to the sealing surface. This is because: the flow channel area formed at the sealing pair is larger than the regulating area formed at the regulating pair, so that the pressure drop and flow rate formed by the fluid medium at the sealing pair are smaller than those at the regulating pair, and the scouring damage of the fluid medium is smaller, which is conducive to maintaining the sealing surface of the sealing pair.

[0030] Furthermore, the sequential coordination of the seat plate, slide plate, and regulating plate creates two relatively independent pairs for shutoff and regulating control. This creates two throttling windows during the opening process, resulting in two-stage pressure reduction and throttling. This reduces the flow rate of the medium while increasing the bearing surface, making it far more durable than the slide-type regulating valve with a waist-shaped sieve aperture structure. This is because the regulating and shutoff control of the slide-type regulating valve with a waist-shaped sieve aperture structure are both performed in the same pair, resulting in a single-stage pressure reduction and throttling. Therefore, the erosion of the medium during the regulation process will inevitably cause significant erosion damage to the sealing surface.

[0031] Furthermore, a pressure relief groove is formed in an inclined structure from the throttling side surface at a top side edge of the throttling window of the regulating plate;

[0032] When the regulating valve is in a closed state, the second bottom side edge of the throttle window of the slide plate is communicated with the pressure relief groove at the first top side edge of the throttle window of the regulating plate.

[0033] When the slide closes the regulating valve during its linear displacement, residual fluid in the throttle window and fluid that seeps into the throttle window through micro-leakage at the sealing pair will generate a thrust on the valve seat plate in the opposite direction of the preload, which can seriously cause the sealing pair to fail. To this end, the above technical measures form a pressure relief groove between the throttle window of the slide and the throttle window of the regulating plate. This will drain the fluid that enters the throttle window of the slide to the rear of the valve, relieving the pressure and ensuring the stable operation of the regulating valve.

[0034] Furthermore, tension springs are connected to both sides of the width between the valve seat plate and the adjustment plate to pre-compress the valve seat plate, the slide plate, and the adjustment plate. This technical measure ensures a sequential and tight fit of the valve seat plate, the slide plate, and the adjustment plate through the tension of the tension springs, while substantially not affecting the linear displacement of the slide plate. This facilitates easy assembly and molding of the valve seat plate, the slide plate, and the adjustment plate, reducing the technical difficulty of assembly.

[0035] Furthermore, the valve seat plate and / or the adjustment plate are provided with guide plates on both sides of the width direction of the slide plate. This technical measure can reliably guide the linear displacement of the slide plate, ensuring that the linear displacement of the slide plate can be carried out accurately and improving the adjustment control accuracy.

[0036] Furthermore, the valve seat plate, the slide plate and the adjustment plate are respectively rectangular structures. This technical measure is conducive to the formation and effectiveness of the tension spring and the guide plate.

[0037] Furthermore, the bottom throttling area of ​​the second throttling window of the slide has a gradual transition from large to small flow area between the sealing surface that cooperates with the valve seat plate and the throttling surface that cooperates with the regulating plate. A flow-increasing groove with a concave structure is formed in the bottom throttling area of ​​the second throttling window on the sealing surface. This technical measure forms a flow-increasing groove structure on the sealing side of the slide, thereby increasing the flow area at the sealing pair at small openings, reducing the pressure drop and flow velocity of the fluid medium, and thus reducing erosion damage to the sealing surface caused by the fluid medium.

[0038] Furthermore, the sealing side surface of the valve seat plate and the surface of the flow window have an anti-scouring alloy layer with a hardness of HRC ≥ 60 and a thickness of ≥ 1.5 mm;

[0039] The surfaces on both sides of the slide in the thickness direction and the surface of the second throttle window have an anti-scouring alloy layer with a hardness of HRC ≥ 60 and a thickness of ≥ 1.5 mm;

[0040] The throttling side surface of the regulating plate and the surface of the throttling window 1 have an anti-scouring alloy layer with a hardness of HRC ≥ 60 and a thickness of ≥ 1.5 mm.

[0041] These technical measures enhance the erosion resistance of the valve seat plate, slide plate, and regulating plate, thereby increasing the service life of the resulting control valve and facilitating its suitability for process control applications involving particulate-laden fluids, such as those encountered in coal chemical processing. These control valves, employing these technical measures, are reliably suitable for applications in harsh working environments where high-speed flow of particulate-laden fluids can cause significant erosion damage.

[0042] As one of the preferred solutions, a plurality of guide orifice plates are arranged at intervals in the rear medium channel of the valve body;

[0043] The guide holes between the front and rear guide hole plates form an axial alignment fit.

[0044] The above technical measures can guide the single-stream fluid medium flowing out of the adjustment plate into multiple streams. On the one hand, the fluid medium is made to flow in a straight line as much as possible, reducing the scattering of the fluid medium, thereby reducing the scouring damage of the fluid medium to the rear medium channel, and forming a reliable adaptation to the adjustment plate with a centrally symmetrical distribution of the upstream flow channel area; on the other hand, the high-speed flowing fluid medium is consumed and depressurized by multiple streams, the destruction points of the fluid medium are dispersed, and the bearing surface of the fluid medium is increased, thereby reliably reducing the scouring destructive force of the fluid medium, which is especially significant when the anti-scouring alloy layer is sprayed on the flow surface of the guide orifice plate; on the other hand, when the fluid medium flows through the front and rear guide orifice plates, the fluid medium is made to flow in a straight line as much as possible, reducing the scattering of the fluid medium between the front and rear guide orifice plates, thereby reducing erosion while consuming and reducing pressure, and improving service life.

[0045] Furthermore, the valve body is mainly composed of a main valve body, a front valve body and a rear valve body;

[0046] A valve cavity is formed in the main valve body, and a valve cover is sealedly connected to the main valve body on the top side of the valve cavity;

[0047] The front valve body is sealed and connected to the front side of the main valve body relative to the flow direction of the fluid medium, and presses the valve seat plate arranged in the valve cavity through the pressing spring;

[0048] Relative to the flow direction of the fluid medium, the rear valve body is sealed and connected to the rear side of the main valve body, and is tightened against the adjustment plate arranged in the valve cavity and the guide orifice plate arranged in the rear medium channel of the rear valve body through a positioning sleeve.

[0049] The valve body structure of the above technical measures is conducive to reducing the technical difficulty of processing and assembly, making the regulating valve with the above structure easy to process and assemble, and ensuring that the relative position relationship between the various components is stable and reliable.

[0050] Furthermore, a compression sleeve is installed between the front valve body and the valve seat plate;

[0051] The front end of the compression sleeve is sealingly sleeved in the front medium channel of the front valve body;

[0052] The rear end of the compression sleeve abuts against the valve seat plate with a stop interlocking structure;

[0053] The outer periphery of the compression sleeve is provided with a spring seat which is convex radially outwards, and the pressing spring is sleeved between the spring seat and the rear end of the front valve body.

[0054] The above technical measures can ensure that the front valve body is reliably connected to the main valve body, while at the same time, the preload of the tightening spring can be reliably applied to the valve seat plate through the pressing sleeve, and the reliability of the relative sealing structure is guaranteed.

[0055] The beneficial technical effect of the present invention is that the slide-type regulating valve of the above-mentioned technical measures forms an equal percentage flow characteristic, and has technical characteristics such as simple structure, easy molding, large flow area, and easy and precise adjustment. At the same time, for the straight-through media channel, it can reliably reduce the scattering of high-speed fluid media and reduce the scouring destructive force of the fluid medium, effectively meeting the process control working environment of fluid media containing particles such as coal chemical industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a structural schematic diagram of the present invention.

[0057] Figure 2 for Figure 1 Schematic diagram of the adjustment plate structure.

[0058] Figure 3 for Figure 1 The slide plate in FIG. 1 is used as a structural diagram for cooperating with one side (i.e., the front side) of the valve seat plate.

[0059] Figure 4 for Figure 1 The slide plate in FIG. 1 is used as a structural diagram for cooperating with one side (i.e., the rear side) of the adjustment plate.

[0060] Figure 5 for Figure 1 Schematic diagram of the structure of the process of the interlaced overlapping cooperation of the slide and the adjustment plate (the flow-increasing groove is not shown on the front side of the slide, and the flow-increasing groove does not participate in the throttling between the slide and the adjustment plate).

[0061] Figure 6 for Figure 1 Schematic diagram of the valve seat plate structure.

[0062] Figure 7 for Figure 1 Schematic diagram of the structure of the valve seat plate and the slide plate in the staggered overlapping matching process.

[0063] Figure 8 for Figure 1 AA view in.

[0064] Figure 9 for Figure 1 A partial enlarged view of the valve cavity.

[0065] Figure 10 for Figure 1 Schematic diagram of the structure when the slide plate and the adjustment plate cooperate through the pressure relief groove.

[0066] Figure 11 for Figure 1 A partial enlarged view of the rear medium channel in the figure.

[0067] Figure 12 This is a curve diagram of the equal percentage flow characteristic adjustment of the present invention.

[0068] The meaning of the codes in the figure are: 1—valve body; 11—main valve body; 12—front valve body; 13—pressing sleeve; 14—front medium channel; 15—tightening spring; 16—rear valve body; 17—positioning sleeve; 18—rear medium channel; 19—valve cover; 110—valve chamber; 111—guide orifice plate; 112—spacer; 2—adjusting plate; 21—throttling window 1; 22—pressure relief groove; 23—guide plate 1; 3—slide plate; 31—throttling window 2; 32—flow increasing groove; 4—valve seat plate; 41—circulation window; 42—guide plate 2; 5—valve stem; 6—tension spring. DETAILED DESCRIPTION

[0069] The present invention relates to a valve for industrial process control, specifically a slide-type regulating valve. The main technical solution of the present invention is described in detail below with reference to a plurality of embodiments. Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 and Figure 12 The technical solution of the present invention is clearly and in detail explained; although other embodiments are not separately drawn with drawings, their main structures can still refer to the drawings of Example 1.

[0070] It should be noted that the drawings of the present invention are schematic, and unnecessary details have been simplified to clarify the technical purpose of the present invention, so as to avoid blurring the technical solutions that the present invention contributes to the prior art.

[0071] Example 1

[0072] See also Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 and Figure 12 As shown, the present invention includes a valve body 1, an adjusting plate 2, a slide plate 3, a valve seat plate 4 and a valve stem 5.

[0073] Specifically, relative to the flow direction of the fluid medium, the valve body 1 primarily comprises a front valve body 12, a main valve body 11, and a rear valve body 16, which are assembled in front, middle, and rear positions. A straight-through front medium passage 14 is defined within the front valve body 12. A straight-through rear medium passage 18 is defined within the rear valve body 16. The main valve body 11 defines straight-through passages in both the front and rear directions, allowing for the assembly of the front and rear valve bodies 12 and 16. A passage for the valve stem 5 is defined at the top of the main valve body 11, allowing for assembly of the valve cover 19.

[0074] The rear end of the front valve body 12 is embedded in the front side of the main valve body 11 with a stop structure, and the overlapping part thereof is sealed with a sealing ring and fixed by bolts.

[0075] The front end of the rear valve body 16 is embedded in the rear side of the main valve body 11 with a stop structure, and the overlapping part thereof is sealed with a sealing ring and fixed by bolts.

[0076] The bottom end of the valve cover 19 is embedded in the top side of the main valve body 11 with a stop structure, and the overlapping part thereof is sealed with a sealing ring and fixed by bolts.

[0077] In this way, the space enclosed by the valve cover 19, the front valve body 12 and the rear valve body 16 in the main valve body 11 constitutes a valve chamber 110. The valve chamber 110 is located between the front and rear medium channels, and the medium channels before and after the valve chamber 110 are also a straight-through structure.

[0078] The adjustment plate 2 has a generally rectangular profile, with the top and bottom heights greater than the left and right widths. The adjustment plate 2 is assembled within the valve cavity 110 of the valve body 1, adjacent to the front end of the rear valve body 16, through the interaction of the valve seat plate 4 and the forward and rearward positions of the positioning sleeve 17, described below. The outer contour of the adjustment plate 2 corresponding to the rear media passage 18 is circular, ensuring the reliable formation of the throttling window 1 21. The area of ​​the adjustment plate 2 corresponding to the rear media passage 18 is provided with a throttling window 1 21, which extends forward and backward, forming a cross-shaped throttling window structure.

[0079] More specifically, the throttle window 21 on the adjustment plate 2 corresponds to the linear displacement direction of the slide 3 (i.e., the height direction). The contour line of the bottom throttle area is a V-shaped structure with a gradually expanding curve, and the contour line of the top throttle area is an inverted V-shaped structure with a gradually expanding curve. The top and bottom sides are basically symmetrical. On the left and right sides in the width direction, the contour line of the throttle area is a straight U-shaped structure, and the left and right sides are basically symmetrical. In the front and rear projection directions, the throttle window 21 is basically inscribed within the effective coverage area of ​​the rear medium channel 18. This makes the flow channel area on the adjustment plate 2 symmetrically distributed, which facilitates the flow of the fluid medium to be concentrated in the center and reduces scattered erosion.

[0080] Slide plate 3 has a generally rectangular profile, with top and bottom heights greater than left and right widths. Slide plate 3 is assembled within valve cavity 110 of valve body 1 via valve stem 5 in a linear displacement configuration. Slide plate 3 is positioned in front of regulating plate 2 and, under the influence of valve seat plate 4 (described below), is pre-pressed against the front of regulating plate 2, forming a surface-contact fit. Slide plate 3 is provided with a second throttling window 31 extending from front to back in a cross-shaped throttling window structure.

[0081] More specifically, the second throttle window 31 on the slide plate 3 has a contour line of a gradually expanding V-shaped structure in the linear displacement direction, and a contour line of an inverted V-shaped structure in the top throttle area, with the top and bottom sides being substantially symmetrical. On the left and right sides in the width direction, the contour lines of the throttle areas form a straight U-shaped structure, with the left and right sides being substantially symmetrical. The second throttle window 31 can overlap with the first throttle window 21 on the adjustment plate 2 in the forward and rearward projection directions. This requires the slide plate 3 to achieve this when it is in position.

[0082] The contour line of the throttling window 2 31 of the above-mentioned slide 3 is also special. In the throttling area on the bottom side of the throttling window 2 31, a gradual structure is formed in which the flow area transitions from large to small at the front and rear positions. In other words, the sealing side surface of the slide 3 that cooperates with the valve seat plate 4 is the front side, and the throttling side surface that cooperates with the adjustment plate 2 is the rear side. Then, the throttling area on the bottom side of the throttling window 2 31 forms a U-shaped concave flow structure on the sealing side surface, while maintaining the above-mentioned V-shaped structure on the throttling side surface. The U-shaped structure on the front side gradually transitions to the V-shaped structure on the rear side. The U-shaped concave structure on the sealing side surface of the slide 3 forms a flow-increasing groove 32.

[0083] That is, the throttle window 2 31 on the slide 3 and the throttle window 1 21 on the regulating plate 2 are substantially identical in shape and size (except for the flow-increasing groove structure), but are arranged offset in height. Typically, to achieve a compact structure for the main valve body 11, when the slide 3 is linearly displaced to its highest position, the throttle window 2 31 is located above the throttle window 1 21, and the two are offset in height. The non-throttle window area of ​​the slide 3 blocks the throttle window 1 21, thereby achieving the closed state of the regulating valve. When the slide 3 is linearly displaced to its lowest position, the throttle window 2 31 and the throttle window 1 21 form an overlapping and aligned fit at the front and rear positions, thereby achieving the fully open state of the regulating valve. During the linear displacement process of the slide 3 between the highest and lowest positions, the throttle window 2 31 and the throttle window 1 21 form a non-aligned, staggered, overlapping fit, thereby achieving the throttling state of the regulating valve with an equal percentage flow characteristic.

[0084] The valve seat plate 4 has a contour substantially identical to that of the regulating plate 2, forming a rectangular structure with top and bottom heights greater than left and right widths. The valve seat plate 4 is assembled within the valve cavity 110 of the valve body 1, adjacent to the rear end of the front valve body 12 and located in front of the slide 3, through the action of the tension spring 15 and tension spring 6 described below. It is pre-pressed against the front side of the slide 3, forming a surface-to-surface fit. The valve seat plate 4 corresponds to the outer contour of the front medium passage 14 area and has a circular structure to ensure reliable formation of the flow window 41. The area of ​​the valve seat plate 4 corresponding to the front medium passage 14 is provided with a circular flow window 41 extending from front to rear, substantially matching the contour of the front medium passage 14.

[0085] To ensure a pre-stressed surface-contact fit between the valve seat plate 4, slide plate 3, and adjustment plate 2 in the forward and rearward positions, tension springs 6 are connected to the front and rear sides of the width between the valve seat plate 4 and the adjustment plate 2, respectively. The pre-tightening force of the tension springs 6 on both sides maintains a pre-stressed, tight fit between the valve seat plate 4, slide plate 3, and adjustment plate 2. This pre-stressed, tight fit should not hinder the linear displacement of the slide plate 3. The linear torque exerted by the drive mechanism on the slide plate 3 through the valve stem 5 enables the slide plate 3 to perform linear displacement between the valve seat plate 4 and the adjustment plate 2 in a surface-contact fit.

[0086] To ensure that the linear displacement of the slide plate 3 is substantially fixed, guide plates 42 extending toward one side of the slide plate 3 and located at the outer edges of the slide plate 3 in the width direction are connected to both sides of the valve seat plate 4. The guide plates 42 are formed in two groups arranged at an upper and lower interval on the valve seat plate 4, and the upper and lower groups are positioned substantially at the top and bottom sides of the flow window 41. Similarly, guide plates 23 extending toward one side of the slide plate 3 and located at the outer edges of the slide plate 3 in the width direction are connected to both sides of the adjustment plate 2 in the width direction. The guide plates 23 are formed in two groups arranged at an upper and lower interval on the adjustment plate 2, and the upper and lower groups are positioned substantially at the top and bottom sides of the throttle window 21.

[0087] To prevent guide plate 1 23 and guide plate 2 42 from interfering with the preload of the tension spring 6, if guide plate 1 23 on the adjustment plate 2 and guide plate 2 42 on the valve seat plate 4 are arranged at the same height, they should be spaced in a coordinated manner. If guide plate 1 23 on the adjustment plate 2 and guide plate 2 42 on the valve seat plate 4 are arranged in an upper and lower staggered arrangement, they should be spaced in a coordinated manner with the opposing valve seat plate 4 / adjustment plate 2. This also shows that the width of the slide plate 3 is smaller than the width of the valve seat plate 4 and adjustment plate 2, respectively, and is within the width coverage of the valve seat plate 4 and adjustment plate 2.

[0088] In order to cooperate with the throttling window 121 on the above-mentioned regulating plate 2 to guide and reduce the pressure of the high-speed fluid medium after throttling, two guide orifice plates 111 are arranged at a front and rear spacing in the rear medium channel 18 of the rear valve body 16, and at the same time, the regulating plate 2 and the first guide orifice plate are arranged at a front and rear spacing.

[0089] In order to facilitate assembly and ensure stability after assembly, the guide orifice 111 is limited by a stop in the rear medium channel 18 of the rear valve body 16. More specifically:

[0090] The diameter of the front section of the channel on the rear valve body 16 is larger than the diameter of the rear section, and the two form a step fit;

[0091] The second guide orifice plate is installed through the front end and axially limited at the step;

[0092] The front side of the second guide orifice plate is provided with a spacer 112;

[0093] A first guide orifice plate is mounted on the front side of the spacer 112;

[0094] A positioning sleeve 17 is installed on the front side of the first guide orifice plate;

[0095] Thus, the inner hole of the positioning sleeve 17, the guide hole of the first guide orifice plate, the inner hole of the spacer sleeve 112, the guide hole of the second guide orifice plate, and the rear section channel of the rear valve body 16 together constitute the rear medium channel 18 for the flow of fluid medium.

[0096] In order to reduce erosion during consumption and pressure reduction, the guide holes between the first guide orifice plate and the second guide orifice plate form an axial alignment fit, that is, a substantially coaxial fit.

[0097] When the rear valve body 16 is sealed and assembled to the main valve body 11, the front end of the positioning sleeve 17 engages the rear surface of the adjustment plate 2 with a stopper structure, thus limiting the adjustment plate 2 both radially and axially. To improve scour resistance, an scour-resistant alloy layer, such as WC or Ni60, with a hardness of approximately 60 HRC and a thickness of approximately 1.5 mm is spray-coated on the inner bore of the positioning sleeve 17, the flow-facing surfaces (i.e., the front surfaces) of the two guide orifice plates, and the inner bore of the spacer sleeve 112.

[0098] In the above valve body 1 structure, in order to seal between the front valve body 12 and the valve seat plate 4 and generate axial preload on the valve seat plate 4, the front valve body 12 is pressed against the valve seat plate 4 through the pressing sleeve 13 and the pressing spring 15. More specifically:

[0099] The diameter of the rear section of the channel on the front valve body 12 is larger than that of the front section, and the two form a step fit. The fitting step is an inclined surface structure to adapt to the basically smooth assembly fit between the pressing sleeve 13;

[0100] The front end of the compression sleeve 13 is overlapped and inserted into the rear section of the channel of the front valve body 12. The compression sleeve 13 can be axially displaced in the front valve body 12, and the overlapping sleeve joint of the two is sealed.

[0101] The rear end of the pressing sleeve 13 abuts against the front surface of the valve seat plate 4 with a stop interlocking structure, thus forming a radial limit for the valve seat plate 4.

[0102] The outer periphery of the pressing sleeve 13 has a radially outwardly convex spring seat, which is adjacent to the valve seat plate 4 and forms a spacing fit with the rear end face of the front valve body 12;

[0103] The pressing spring 15 is sleeved between the spring seat and the rear end of the front valve body 12. The elastic force of the pressing spring 15 causes the pressing sleeve 13 to always generate an axial outward thrust in the front valve body 12. This thrust acts stably on the valve seat plate 4, forming a seal on the front side surface of the valve seat plate 4 on the one hand, and generating an axial preload on the valve seat plate 4 on the other hand.

[0104] The front section of the channel of the front valve body 12 and the inner hole of the pressing sleeve 13 form a front medium channel 14 for the flow of fluid medium.

[0105] Through the axial thrust of the above-mentioned tightening spring 15 and the axial limitation of the above-mentioned positioning sleeve 17, the guide orifice plate 111 is stably assembled in the rear valve body 16, the adjustment plate 2 is stably seated on the front end of the positioning sleeve 17, and the two form a reliable seal. The slide plate 3 stably matches the adjustment plate 2 and the valve seat plate 4 with surface contact, and the pressing sleeve 13 forms a reliable seal on the valve seat plate 4.

[0106] Based on the above structure, a sealing pair and a throttling pair are formed in the valve cavity 110 of the valve body 1. The sealing pair is formed by the cooperation of the valve seat plate 4 and the slide plate 3, and the throttling pair is formed by the cooperation of the slide plate 3 and the adjustment plate 2. More specifically:

[0107] When the regulating valve is in the closed state, the slide 3 moves straight up to the highest position, the throttling window 2 31 of the slide 3 is staggered with the flow window 41 of the valve seat plate 4, and the non-throttling window area of ​​the slide 3 blocks the flow window 41 of the valve seat plate 4 (see Figure 7 As shown in a, the opening is 0), a seal is formed between the rear surface of the valve seat plate 4 and the front surface of the slide plate 3; at this time, the throttling window 2 31 of the slide plate 3 and the throttling window 1 21 of the regulating plate 2 are also staggered and matched, and the non-throttling window area of ​​the slide plate 3 blocks the throttling window 1 21 of the regulating plate 2. The slide plate 3 seals the valve cavity between the valve seat plate 4 and the regulating plate 2, preventing the medium channel from communicating with the non-flow-allowed area of ​​the valve cavity (see Figure 5 a);

[0108] When the regulating valve is in the throttling state, the slide plate 3 moves between the highest position and the lowest position of the straight stroke, and the throttling window 31 of the slide plate 3 and the flow window 41 of the valve seat plate 4 form a staggered overlapping fit (see Figure 7 b. Figure 7 c. Figure 7 As shown in d, the shaded part is the flow area. Figure 7 b opening is 25%, Figure 7 c opening is 50%, Figure 7 d opening is 75%); at this time, the throttle window 2 31 of the slide plate 3 and the throttle window 1 21 of the regulating plate 2 form a staggered overlapping fit (see Figure 5 b. Figure 5 c. Figure 5 d, the shaded area is the flow area); flow passes between the valve seat plate 4 and the slide plate 3, and a throttling characteristic of equal percentage flow is formed between the slide plate 3 and the regulating plate 2. During this process, the slide plate 3 seals the valve cavity between the valve seat plate 4 and the regulating plate 2, preventing the medium channel from communicating with the non-flow-allowed area of ​​the valve cavity;

[0109] When the regulating valve is in the fully open state, the slide plate 3 moves straight down to the lowest position, and the throttle window 2 31 of the slide plate 3 is within the coverage range of the flow window 41 of the valve seat plate 4 (see Figure 7 e, the opening is 100%, and the shaded area is the flow area); at this time, the throttle window 2 31 of the slide plate 3 and the throttle window 1 21 of the regulating plate 2 form an overlapping and aligned fit (see Figure 5 e), the shaded area is the flow area); flow passes between the valve seat plate 4 and the slide plate 3, and a throttling with equal percentage flow characteristics is formed between the slide plate 3 and the regulating plate 2; the slide plate 3 seals the valve cavity between the valve seat plate 4 and the regulating plate 2, preventing the medium channel from communicating with the non-flow-allowed area of ​​the valve cavity.

[0110] For example, the relationship between the opening and the flow area of ​​the equal percentage flow characteristic is as follows: Figure 12 As shown in the figure, due to the presence of the flow-increasing groove on the front side of the slide, the flow area formed by the combination of the valve seat plate and the slide is different from the flow area formed by the combination of the slide and the adjustment plate. Figure 12 Indicated as Ⅰ-adjusting the secondary flow area, the flow regulation of the valve is realized and meets the technical requirements of the flow characteristics. The flow area formed by the combination of the valve seat plate and the slide plate is Figure 12 It is expressed as Ⅱ-seal pair flow area, and Ⅱ≥Ⅰ, to ensure that the seal pair does not throttle the flow during flow regulation, so as not to affect the control of the flow by the regulating pair.

[0111] In order to improve the anti-scouring performance and apply it to harsh working conditions containing particulate media such as coal chemical industry, the sealing side surface of the valve seat plate 4 and the surface of the flow window 41 are respectively sprayed with an anti-scouring alloy layer with a hardness of HRC of about 60 and a thickness of about 1.5 mm, such as WC, Ni60 and other alloy layers; the front side surface, rear side surface and the surface of the throttling window 2 31 of the slide plate 3 are respectively sprayed with an anti-scouring alloy layer with a hardness of HRC of about 60 and a thickness of about 1.5 mm, such as WC, Ni60 and other alloy layers; the throttling side surface of the regulating plate 2 and the surface of the throttling window 1 31 are respectively sprayed with an anti-scouring alloy layer with a hardness of HRC of about 60 and a thickness of about 1.5 mm, such as WC, Ni60 and other alloy layers. The anti-erosion alloy layer on the sealing surface on the rear side of the valve seat plate 4, the anti-erosion alloy layer on the front and rear surfaces of the slide plate 3, and the anti-erosion alloy layer on the throttling surface on the front side of the regulating plate 2 are respectively polished to achieve mirror-like flatness, and the leakage level can reach ANSIB16.104 Level VI or above. Sharp blades are formed between the mutual surface contacts, with extremely strong cutting, shearing and scraping capabilities.

[0112] In order to make the molding structure of the anti-erosion alloy layer targeted and cost-effective, the anti-erosion alloy layer on the contact surface of the valve seat plate 4 and the adjustment plate 2 is formed within the linear displacement range of the slide plate 3.

[0113] In the aforementioned mating structure between the slide plate 3 and the valve seat plate 4, to ensure sealing performance, when the slide plate 3 is linearly displaced to its highest position, a clearance is formed between the bottom edge of the throttle window 2 31 of the slide plate 3 and the top edge of the flow window 41 of the valve seat plate 4. This clearance is typically greater than 3mm and less than 8mm, meaning that the bottom edge of the throttle window 2 31 is located 3 to 8mm above the top edge of the flow window 41. This ensures reliable sealing while ensuring reasonable opening adjustment control. At the same time, a clearance is formed between the bottom edge of the slide plate 3 and the bottom edge of the flow window 41 of the valve seat plate 4. This clearance is typically greater than 5mm and less than 20mm, meaning that the bottom edge of the slide plate 3 is located 5 to 20mm below the bottom edge of the flow window 41.

[0114] In the above structure, when the regulating valve is in the closed state, the throttle window 2 31 on the slide 3 forms a closed interlayer cavity between the valve seat plate 4 and the regulating plate 2. Residual fluid in the slide 3 during its upward linear movement, as well as fluid that seeps into the seal pair, generates a reaction force that pushes the valve seat plate 4 open, affecting the sealing performance. To prevent this, a pressure relief groove 22 is formed at the top edge of the throttle window 1 21 of the regulating plate 2 in a concave inclined structure extending from the throttle side surface. When the regulating valve is in the closed state, the throttle window 2 31 of the slide 3 is positioned above the throttle window 1 21 of the regulating plate 2, forming a spaced fit. At this point, the bottom edge of the throttle window 2 31 of the slide 3 communicates with the pressure relief groove 22 at the top edge of the throttle window 1 21 of the regulating plate 2. That is, when the regulating valve is in the closed state, the throttle window 2 31 of the slide 3 maintains a slight connection with the throttle window 1 21 of the regulating plate 2 via the pressure relief groove 22.

[0115] Example 2

[0116] The invention comprises a valve body, an adjusting plate, a sliding plate and a valve stem.

[0117] Specifically, relative to the flow direction of the fluid medium, the valve body primarily comprises a front valve body, a main valve body, and a rear valve body, which are assembled in front, middle, and rear positions. A straight-through front medium channel is defined within the front valve body. A straight-through rear medium channel is defined within the rear valve body. The main valve body has straight-through channels in both the front and rear directions, allowing for the assembly of the front and rear valve bodies. A valve stem insertion channel is defined at the top of the main valve body, allowing for assembly of the valve cover.

[0118] The rear end of the front valve body is embedded in the front side of the main valve body with a stop structure, and their overlapping parts are sealed with a sealing ring and fixed by bolts.

[0119] The front end of the rear valve body is embedded in the rear side of the main valve body with a stop structure, and their overlapping parts are sealed with a sealing ring and fixed by bolts.

[0120] The bottom end of the valve cover is embedded in the top side of the main valve body with a stop structure, and their overlapping parts are sealed with a sealing ring and fixed by bolts.

[0121] In this way, the space enclosed by the valve cover, the front valve body and the rear valve body in the main valve body constitutes a valve cavity, and the valve cavity is located between the front and rear medium channels, and the medium channels in front and behind the valve cavity are also a straight-through structure.

[0122] The adjustment plate has a generally rectangular shape, with the top and bottom heights greater than the left and right widths. It is fixedly mounted within the valve body's cavity, adjacent to the front end of the rear valve body. The adjustment plate's outer contour, corresponding to the rear media passage area, is circular, ensuring reliable formation of throttling window 1. The area of ​​the adjustment plate corresponding to the rear media passageway features throttling window 1, which extends from front to back and forms a cross-shaped throttling window structure.

[0123] More specifically, the throttle window 1 on the adjustment plate corresponds to the linear displacement direction of the slide described below—i.e., the height direction. The contour line of the bottom throttle area forms a V-shaped structure with a gradually expanding curve, and the contour line of the top throttle area forms an inverted V-shaped structure with a gradually expanding curve. The top and bottom sides are basically symmetrically formed. On the left and right sides in the width direction, the contour line of the throttle area forms a straight U-shaped structure, and the left and right sides are basically symmetrically formed. In the projection direction of the front and rear positions, the throttle window 1 is basically inscribed within the effective coverage area of ​​the rear medium channel. This makes the flow channel area on the adjustment plate symmetrically distributed, which helps the fluid medium flow in the center and reduces scattered erosion.

[0124] The slide has a generally rectangular shape, with the top and bottom heights greater than the left and right widths. The slide is assembled within the valve body's valve cavity via the valve stem in a linear displacement configuration. It is located immediately adjacent to the rear end of the front valve body and in front of the adjustment plate, forming a substantially surface-to-surface engagement with the front of the adjustment plate. The slide features a second throttling window, extending from front to rear and forming a cross-shaped throttling window structure.

[0125] More specifically, the second throttle window on the slide, corresponding to the linear displacement direction, has a bottom throttle area with a contour line that forms a V-shaped structure with a gradually expanding curve, and a top throttle area with a contour line that forms an inverted V-shaped structure with a gradually expanding curve, with the top and bottom sides being essentially symmetrical. On the left and right sides of the width direction, the contour lines of the throttle area form a straight U-shaped structure, with essentially symmetrical left and right sides. The second throttle window can overlap with the first throttle window on the adjustment plate in both forward and rearward projection directions, of course, this requires the slide to achieve this when it is in position.

[0126] That is, the throttle window 2 on the slide plate and the throttle window 1 on the regulating plate are substantially identical in shape and size, but are offset in height. Typically, to achieve a compact main valve body, when the slide plate is linearly displaced to its highest position, the throttle window 2 is located above the throttle window 1, and the two are offset in height. The non-throttle window area of ​​the slide plate blocks the throttle window, thereby achieving the closed state of the regulating valve. When the slide plate is linearly displaced to its lowest position, the throttle window 2 and the throttle window 1 form an overlapping and aligned fit at the front and rear positions, thereby achieving the fully open state of the regulating valve. During the linear displacement of the slide plate between the highest and lowest positions, the throttle window 2 and the throttle window 1 form a non-aligned, staggered, overlapping fit, thereby achieving the throttling state of the regulating valve with an equal percentage flow characteristic.

[0127] In order to ensure that the linear displacement of the slide will basically not be displaced, guide plates extending toward one side of the slide and located at the outer edges of both sides of the width direction of the slide are connected on both sides of the width direction of the adjustment plate. The guide plates are formed in two groups arranged in upper and lower spacing on the adjustment plate, and the positions of the upper and lower groups are basically at the top and bottom sides of the throttling window one.

[0128] In order to cooperate with the throttling window 1 on the above-mentioned regulating plate to guide and reduce the pressure of the high-speed fluid medium after throttling, two guide orifice plates are arranged at a front and rear spacing in the rear medium channel of the rear valve body, and at the same time, the regulating plate and the first guide orifice plate are arranged at a front and rear spacing.

[0129] In order to facilitate assembly and ensure stability after assembly, the guide orifice plate is limited by a stop in the rear medium channel of the rear valve body. More specifically:

[0130] The diameter of the front section of the channel on the rear valve body is larger than the diameter of the rear section, and the two form a step fit;

[0131] The second guide orifice plate is installed through the front end and axially limited at the step;

[0132] A spacer is provided on the front side of the second guide orifice plate;

[0133] The first guide orifice plate is installed on the front side of the spacer;

[0134] A positioning sleeve is installed on the front side of the first guide orifice plate;

[0135] Thus, the inner hole of the positioning sleeve, the guide hole of the first guide orifice plate, the inner hole of the spacer sleeve, the guide hole of the second guide orifice plate, and the rear section channel of the rear valve body together constitute a rear medium channel for the flow of fluid medium.

[0136] In order to reduce erosion during consumption and pressure reduction, the guide holes between the first guide orifice plate and the second guide orifice plate form an axial alignment fit, that is, a substantially coaxial fit.

[0137] When the rear valve body is sealed and assembled onto the main valve body, the front end of the locating sleeve is inserted into the rear surface of the adjustment plate using a stopper structure. The adjustment plate is fixed to the rear valve body or the main valve body, thus forming an axial limit for the guide orifice plate. To improve scour resistance, an scour-resistant alloy layer with a hardness of approximately 60 HRC and a thickness of approximately 1.5 mm, such as WC or Ni60, is sprayed on the inner hole of the locating sleeve, the flow-facing surfaces (i.e., the front surfaces) of the two guide orifice plates, and the inner hole of the spacer sleeve.

[0138] Based on the above structure, a throttling pair is formed in the valve cavity of the valve body. More specifically:

[0139] When the regulating valve is in the closed state, the slide moves straight up to the highest position, the throttling window 2 of the slide is staggered with the throttling window 1 of the regulating plate, and the non-throttling window area of ​​the slide blocks the throttling window of the regulating plate to form a seal;

[0140] When the regulating valve is in the throttling state, the slide moves between the highest position and the lowest position of the straight stroke, and the throttling window 2 of the slide and the throttling window 1 of the regulating plate form a staggered overlapping fit;

[0141] When the regulating valve is in the fully open state, the slide plate moves straight down to the lowest position, and the throttling window 2 of the slide plate and the throttling window 1 of the regulating plate form an overlapping and aligned fit.

[0142] As shown above, an equal percentage flow characteristic is formed between the slide plate and the regulating plate.

[0143] In order to improve the anti-scouring performance, the front side surface, rear side surface and surface of the throttle window 2 of the slide plate are respectively sprayed with an anti-scouring alloy layer with a hardness of HRC of about 70 and a thickness of about 1.7 mm, such as WC, Ni60 and other alloy layers; the throttle side surface of the adjustment plate and the surface of the throttle window 1 are respectively sprayed with an anti-scouring alloy layer with a hardness of HRC of about 70 and a thickness of about 1.7 mm, such as WC, Ni60 and other alloy layers.

[0144] Example 3

[0145] The invention comprises a valve body, an adjusting plate, a sliding plate, a valve seat plate and a valve stem.

[0146] Specifically, relative to the flow direction of the fluid medium, the valve body primarily comprises a front valve body, a main valve body, and a rear valve body, which are assembled in front, middle, and rear positions. A straight-through front medium channel is defined within the front valve body. A straight-through rear medium channel is defined within the rear valve body. The main valve body has straight-through channels in both the front and rear directions, allowing for the assembly of the front and rear valve bodies. A valve stem insertion channel is defined at the top of the main valve body, allowing for assembly of the valve cover.

[0147] The rear end of the front valve body is embedded in the front side of the main valve body with a stop structure, and their overlapping parts are sealed with a sealing ring and fixed by bolts.

[0148] The front end of the rear valve body is embedded in the rear side of the main valve body with a stop structure, and their overlapping parts are sealed with a sealing ring and fixed by bolts.

[0149] The bottom end of the bonnet is inserted into the top side of the main valve body with a stopper structure, and the overlapping part is sealed with a sealing ring and fixed with bolts. In this way, the space enclosed by the bonnet, front valve body and rear valve body within the main valve body forms the valve cavity, which is located between the front and rear media channels. The media channels in front and rear of the valve cavity also have a straight-through structure.

[0150] The adjustment plate has a generally rectangular shape, with the top and bottom heights greater than the left and right widths. The adjustment plate is assembled within the valve body's valve cavity, adjacent to the front end of the rear valve body, through the interaction of the seat plate and the forward and rearward positions of the positioning sleeve described below. The outer contour of the adjustment plate, corresponding to the rear media passage area, is circular, ensuring reliable formation of throttling window 1. The area of ​​the adjustment plate corresponding to the rear media passage area features throttling window 1, which extends forward and backward, forming a cross-shaped throttling window structure.

[0151] More specifically, the throttle window 1 on the adjustment plate corresponds to the linear displacement direction of the slide described below—i.e., the height direction. The contour line of the bottom throttle area forms a V-shaped structure with a gradually expanding curve, and the contour line of the top throttle area forms an inverted V-shaped structure with a gradually expanding curve. The top and bottom sides are basically symmetrically formed. On the left and right sides in the width direction, the contour line of the throttle area forms a straight U-shaped structure, and the left and right sides are basically symmetrically formed. In the projection direction of the front and rear positions, the throttle window 1 is basically inscribed within the effective coverage area of ​​the rear medium channel. This makes the flow channel area on the adjustment plate symmetrically distributed, which helps the fluid medium flow in the center and reduces scattered erosion.

[0152] The slide plate has a basic rectangular shape, with the top and bottom heights greater than the left and right widths. It is assembled within the valve body's valve cavity via the valve stem in a linear displacement configuration. It is located in front of the regulating plate and, under the influence of the seat plate described below, is pre-pressed against the front of the regulating plate, forming a surface-to-surface fit. The slide plate features a second throttling window, which extends from front to back and forms a cross-shaped throttling window structure.

[0153] More specifically, the second throttle window on the slide, corresponding to the linear displacement direction, has a bottom throttle area with a contour line that forms a V-shaped structure with a gradually expanding curve, and a top throttle area with a contour line that forms an inverted V-shaped structure with a gradually expanding curve, with the top and bottom sides being essentially symmetrical. On the left and right sides of the width direction, the contour lines of the throttle area form a straight U-shaped structure, with essentially symmetrical left and right sides. The second throttle window can overlap with the first throttle window on the adjustment plate in both forward and rearward projection directions, of course, this requires the slide to achieve this when it is in position.

[0154] That is, the throttle window 2 on the slide plate and the throttle window 1 on the regulating plate are substantially identical in shape and size, but are offset in height. Typically, to achieve a compact main valve body, when the slide plate is linearly displaced to its highest position, the throttle window 2 is located above the throttle window 1, and the two are offset in height. The non-throttle window area of ​​the slide plate blocks the throttle window, thereby achieving the closed state of the regulating valve. When the slide plate is linearly displaced to its lowest position, the throttle window 2 and the throttle window 1 form an overlapping and aligned fit at the front and rear positions, thereby achieving the fully open state of the regulating valve. During the linear displacement of the slide plate between the highest and lowest positions, the throttle window 2 and the throttle window 1 form a non-aligned, staggered, overlapping fit, thereby achieving the throttling state of the regulating valve with an equal percentage flow characteristic.

[0155] The valve seat plate's profile essentially matches that of the regulating plate, forming a rectangular structure with top and bottom heights greater than left and right widths. The valve seat plate is assembled within the valve cavity of the valve body, adjacent to the rear end of the front valve body and located in front of the slide, via the action of the following tensioning and tensioning springs. It is pre-pressed against the front side of the slide, forming a surface-to-surface fit. The valve seat plate corresponds to the outer contour of the front media passage area and is circular in shape to ensure reliable flow window formation. The area of ​​the valve seat plate corresponding to the front media passage features a circular flow window that extends from front to rear and essentially matches the contour of the front media passage.

[0156] To ensure a pre-stressed surface-contact fit between the valve seat plate, slide plate, and adjustment plate in the forward and rearward positions, tension springs are connected to the front and rear sides of the width between the valve seat plate and the adjustment plate. The preload force of the tension springs on both sides maintains a pre-stressed, tight fit between the valve seat plate, slide plate, and adjustment plate. This pre-stressed, tight fit should not hinder the linear displacement of the slide plate. The linear torque exerted by the drive mechanism on the slide plate through the valve stem enables the slide plate to perform linear displacement between the valve seat plate and the adjustment plate in a surface-contact fit.

[0157] To ensure that the slide plate's linear displacement remains essentially constant, two guide plates are connected to the valve seat plate, extending toward one side of the slide plate and located at its outer edges. These guide plates are arranged in two groups, spaced apart, on the valve seat plate, with the upper and lower groups positioned substantially at the top and bottom of the flow window. Similarly, two guide plates are connected to the adjustment plate, extending toward one side of the slide plate and located at its outer edges. These guide plates are arranged in two groups, spaced apart, on the adjustment plate, with the upper and lower groups positioned substantially at the top and bottom of the throttle window. To prevent guide plates 1 and 2 from interfering with the preload of the tension spring, if guide plates 1 on the adjustment plate and guide plates 2 on the valve seat plate are arranged at the same height, they should be spaced in a coordinated manner. If guide plates 1 on the adjustment plate and guide plates 2 on the valve seat plate are arranged in an alternating pattern, they should be spaced in a coordinated manner with the corresponding valve seat plate / adjustment plate. It can also be seen from this that the width of the slide plate is smaller than the width of the valve seat plate and the adjusting plate, respectively, and is within the width coverage range of the valve seat plate and the adjusting plate.

[0158] In order to cooperate with the throttling window 1 on the above-mentioned regulating plate to guide and reduce the pressure of the high-speed fluid medium after throttling, two guide orifice plates are arranged at a front and rear spacing in the rear medium channel of the rear valve body, and at the same time, the regulating plate and the first guide orifice plate are arranged at a front and rear spacing.

[0159] In order to facilitate assembly and ensure stability after assembly, the guide orifice plate is limited by a stop in the rear medium channel of the rear valve body. More specifically:

[0160] The diameter of the front section of the channel on the rear valve body is larger than the diameter of the rear section, and the two form a step fit;

[0161] The second guide orifice plate is installed through the front end and axially limited at the step;

[0162] A spacer is provided on the front side of the second guide orifice plate;

[0163] The first guide orifice plate is installed on the front side of the spacer;

[0164] A positioning sleeve is installed on the front side of the first guide orifice plate;

[0165] Thus, the inner hole of the positioning sleeve, the guide hole of the first guide orifice plate, the inner hole of the spacer sleeve, the guide hole of the second guide orifice plate, and the rear section channel of the rear valve body together constitute a rear medium channel for the flow of fluid medium.

[0166] In order to reduce erosion during consumption and pressure reduction, the guide holes between the first guide orifice plate and the second guide orifice plate form an axial alignment fit, that is, a substantially coaxial fit.

[0167] When the rear valve body is sealed and assembled on the main valve body, the front end of the positioning sleeve is embedded in the rear surface of the adjustment plate with a stop structure, which forms both radial and axial limitations on the adjustment plate.

[0168] In the above valve body structure, in order to seal between the front valve body and the valve seat plate and generate axial pre-pressure on the valve seat plate, the front valve body presses the valve seat plate through the compression sleeve and the pressing spring. More specifically:

[0169] The diameter of the rear section of the channel on the front valve body is larger than that of the front section, and the two form a step fit. The matching step is an inclined surface structure to adapt to the basic smooth assembly fit between the compression sleeve;

[0170] The front end of the compression sleeve is overlapped and inserted into the rear section of the channel of the front valve body. The compression sleeve can be axially displaced in the front valve body, and the overlapping sleeve joint of the two is sealed.

[0171] The rear end of the press sleeve abuts against the front surface of the valve seat plate with a stop interlocking structure, thus forming a radial limit for the valve seat plate.

[0172] The outer periphery of the compression sleeve is provided with a radially outwardly convex spring seat, which is adjacent to the valve seat plate and forms a spacing fit with the rear end face of the front valve body;

[0173] The tightening spring is sleeved between the spring seat and the rear end of the front valve body. The elastic force of the tightening spring causes the compression sleeve to always generate an axial outward thrust in the front valve body. This thrust acts stably on the valve seat plate, forming a seal on the front surface of the valve seat plate on the one hand, and generating axial preload on the valve seat plate on the other hand.

[0174] The front section of the channel of the front valve body and the inner hole of the compression sleeve form a front medium channel for the flow of the fluid medium.

[0175] Through the axial thrust of the above-mentioned tightening spring and the axial limitation of the above-mentioned positioning sleeve, the guide orifice plate is stably assembled in the rear valve body, the adjustment plate is stably located at the front end of the positioning sleeve, and the two form a reliable seal. The slide plate stably matches the adjustment plate and the valve seat plate with surface contact, and the pressure sleeve forms a reliable seal on the valve seat plate.

[0176] Based on the above structure, a relatively separated front and rear sealing pair and a throttling pair are formed in the valve cavity of the valve body. The sealing pair is formed by the cooperation of the valve seat plate and the slide plate, and the throttling pair is formed by the cooperation of the slide plate and the adjustment plate. More specifically:

[0177] When the regulating valve is in the closed state, the slide moves straight up to the highest position, the throttling window 2 of the slide is misaligned with the flow window of the valve seat plate, and the non-throttling window area of ​​the slide blocks the flow window of the valve seat plate, forming a seal between the rear surface of the valve seat plate and the front surface of the slide; at this time, the throttling window 2 of the slide is also misaligned with the throttling window 1 of the regulating plate, and the non-throttling window area of ​​the slide blocks the throttling window 1 of the regulating plate; the slide seals the valve cavity between the valve seat plate and the regulating plate to prevent the medium channel from communicating with the non-flow-allowed flow area of ​​the valve cavity;

[0178] When the regulating valve is in the throttling state, the slide moves between the highest and lowest positions of the straight stroke, and the throttling window 2 of the slide and the flow window of the valve seat plate form a staggered overlapping match; at this time, the throttling window 2 of the slide and the throttling window 1 of the regulating plate form a staggered overlapping match; flow passes between the valve seat plate and the slide, and a throttling with equal percentage flow characteristics is formed between the slide and the regulating plate; during this process, the slide seals the valve cavity between the valve seat plate and the regulating plate to prevent the medium channel from communicating with the non-flow-allowed area of ​​the valve cavity;

[0179] When the regulating valve is in the fully open state, the slide moves straight down to the lowest position, and the throttling window 2 of the slide is within the coverage range of the flow window of the valve seat plate; at this time, the throttling window 2 of the slide and the throttling window 1 of the regulating plate form an overlapping and aligned fit; flow passes between the valve seat plate and the slide, and throttling with equal percentage flow characteristics is formed between the slide and the regulating plate; during the process, the slide closes the valve cavity between the valve seat plate and the regulating plate to prevent the medium channel from communicating with the non-flow-allowed area of ​​the valve cavity.

[0180] In the above-mentioned structure between the slide and the valve seat plate, to ensure sealing performance, when the slide is displaced to its highest position during linear travel, a clearance is formed between the bottom edge of the second throttle window of the slide and the top edge of the flow window of the valve seat plate. This clearance is typically greater than 3mm and less than 8mm, meaning that the bottom edge of the second throttle window is 3 to 8mm above the top edge of the flow window. This ensures reliable sealing while ensuring reasonable opening adjustment control. At the same time, a clearance is formed between the bottom edge of the slide and the bottom edge of the flow window of the valve seat plate. This clearance is typically greater than 5mm and less than 20mm, meaning that the bottom edge of the slide is 5 to 20mm below the bottom edge of the flow window.

[0181] In the above structure, when the regulating valve is in the closed state, the throttling window 2 on the slide forms a closed interlayer cavity between the valve seat plate and the regulating plate. The residual fluid medium in the slide during the straight stroke upward movement, as well as the fluid medium that slightly seeps into the sealing pair, will generate a reaction force that pushes the valve seat plate open, affecting the sealing performance. To prevent this, a pressure relief groove is formed on the top side edge of the throttling window 1 of the regulating plate with an inward concave inclined surface structure from the throttling side surface. When the regulating valve is in the closed state, the throttling window 2 of the slide is located above the throttling window 1 of the regulating plate, forming a spacing fit. At this time, the bottom side edge of the throttling window 2 of the slide is connected to the pressure relief groove on the top side edge of the throttling window 1 of the regulating plate. In other words, when the regulating valve is in the closed state, the throttling window 2 of the slide maintains a slight connection with the throttling window 1 of the regulating plate through the pressure relief groove.

[0182] The above embodiments are only used to illustrate the present invention, rather than to limit it.

[0183] Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the above embodiments or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the present invention.

Claims

1. A slide-type regulating valve, comprising a valve body (1), a regulating plate (2), a slide (3) and a valve stem (5); The valve body (1) is provided with a medium channel and a valve cavity (110) located between the medium channels, and the medium channels in front of and behind the valve cavity (110) are straight-through structures; The regulating plate (2) is assembled in the valve cavity (110) of the valve body (1), and a throttling window (21) is provided in an area of ​​the regulating plate (2) corresponding to the medium channel; The slide plate (3) is assembled in the valve cavity (110) of the valve body (1) in a straight-stroke displacement structure through the valve stem (5), and is located on one side of the regulating plate (2); Its characteristics are: The throttling window 1 (21) on the regulating plate (2) is a cross-shaped throttling window structure; The slide plate (3) is provided with a throttling window 2 (31) having a cross-shaped throttling window structure. During the straight-stroke displacement of the slide plate (3), the throttling window 2 (31) can overlap and align with the throttling window 1 (21); Furthermore, the cross-shaped throttling window structure corresponds to the linear displacement direction of the slide plate (3), the contour line of the bottom throttling area is a V-shaped structure with a gradually expanding curve, and the contour line of the top throttling area is an inverted V-shaped structure with a gradually expanding curve; When the regulating valve is in a closed state, the throttling window 2 (31) of the slide plate (3) is misaligned with the throttling window 1 (21) of the regulating plate (2), and the non-throttling window area of ​​the slide plate (3) blocks the throttling window 1 (21) of the regulating plate (2); When the regulating valve is in a throttling state, the throttling window 2 (31) of the slide plate (3) and the throttling window 1 (21) of the regulating plate (2) are staggered and overlapped; When the regulating valve is in a fully open state, the second throttle window (31) of the slide plate (3) and the first throttle window (21) of the regulating plate (2) overlap and align with each other.

2. The slide-type regulating valve according to claim 1, characterized in that: The regulating plate (2) is located in the valve cavity (110) of the valve body (1), at the rear side of the slide plate (3) relative to the flow direction of the fluid medium; A valve seat plate (4) is also installed in the valve cavity (110) of the valve body (1) and is located in front of the slide plate (3). The valve seat plate (4) is pre-pressed to be in close contact with the slide plate (3). A flow window (41) matching the medium channel is provided in the area of ​​the valve seat plate (4) corresponding to the medium channel. When the regulating valve is in a closed state, the throttling window 2 (31) of the slide plate (3) is misaligned with the flow window (41) of the valve seat plate (4), and the non-throttling window area of ​​the slide plate (3) blocks the flow window (41) of the valve seat plate (4); When the regulating valve is in a throttling state, the throttling window 2 (31) of the slide plate (3) and the flow window (41) of the valve seat plate (4) are staggered and overlapped; When the regulating valve is in a fully open state, the throttle window 2 (31) of the slide plate (3) is within the coverage range of the flow window (41) of the valve seat plate (4).

3. The slide-type regulating valve according to claim 2, characterized in that: The top edge of the throttling window (21) of the regulating plate (2) is provided with a pressure relief groove (22) formed in an inclined structure from the throttling side surface; When the regulating valve is in a closed state, the bottom edge of the throttling window 2 (31) of the slide plate (3) is in communication with the pressure relief groove (22) at the top edge of the throttling window 1 (21) of the regulating plate (2).

4. The slide-type regulating valve according to claim 2, characterized in that: Tension springs (6) for pre-pressing the valve seat plate (4), the slide plate (3) and the regulating plate (2) are respectively connected to both sides in the width direction between the valve seat plate (4) and the regulating plate (2).

5. The slide-type regulating valve according to claim 2 or 4, characterized in that: Both sides of the width direction of the valve seat plate (4) and / or the regulating plate (2) are provided with guide plates located at the outer edges of both sides of the width direction of the slide plate (3); The valve seat plate (4), the slide plate (3) and the regulating plate (2) are respectively rectangular structures.

6. The slide-type regulating valve according to claim 2, characterized in that: The bottom throttling area of ​​the throttling window 2 (31) of the slide plate (3) is a gradual structure with a transition from large to small flow area between the sealing side surface used to cooperate with the valve seat plate (4) and the throttling side surface used to cooperate with the regulating plate (2), and a flow increasing groove (32) with a concave structure on the sealing side surface is formed in the bottom throttling area of ​​the throttling window 2 (31).

7. The slide-type regulating valve according to claim 2, characterized in that: The sealing side surface of the valve seat plate (4) and the surface of the flow window (41) have an anti-scouring alloy layer with a hardness of HRC ≥ 60 and a thickness of ≥ 1.5 mm; The surfaces on both sides of the slide plate (3) in the thickness direction and the surface of the second throttling window (31) have an anti-scouring alloy layer with a hardness of HRC ≥ 60 and a thickness of ≥ 1.5 mm; The throttling side surface of the regulating plate (2) and the surface of the throttling window (21) have an anti-scouring alloy layer with a hardness of HRC ≥ 60 and a thickness of ≥ 1.5 mm.

8. The slide-type regulating valve according to claim 1 or 2, characterized in that: A plurality of guide orifice plates (111) are arranged at intervals within the rear medium channel (18) of the valve body (1); Furthermore, the guide holes between the front and rear guide hole plates (111) form an axially aligned fit.

9. The slide-type regulating valve according to claim 8, characterized in that: The valve body (1) is mainly composed of a main valve body (11), a front valve body (12) and a rear valve body (16); A valve cavity (110) is formed in the main valve body (11), and a valve cover (19) is sealedly connected to the main valve body (11) on the top side of the valve cavity (110); The front valve body (12) is sealed and connected to the front side of the main valve body (11) relative to the flow direction of the fluid medium, and presses the valve seat plate (4) arranged in the valve cavity (110) through the pressing spring (15); Relative to the flow direction of the fluid medium, the rear valve body (16) is sealed and connected to the rear side of the main valve body (11), and is pressed against the regulating plate (2) arranged in the valve cavity (110) and the guide orifice plate (111) arranged in the rear medium channel (18) of the rear valve body (16) through the positioning sleeve (17).

10. The slide-type regulating valve according to claim 9, characterized in that: A compression sleeve (13) is assembled between the front valve body (12) and the valve seat plate (4); The front end of the compression sleeve (13) is sealingly sleeved in the front medium channel (14) of the front valve body (12); The rear end of the compression sleeve (13) abuts against the valve seat plate (4) with a stop interlocking structure; The outer periphery of the pressing sleeve (13) has a spring seat that is radially convex outwardly formed, and the pressing spring (15) is sleeved between the spring seat and the rear end of the front valve body (12).

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