Multi-stage depressurization regulating valve

Abstract

The invention provides a multi-stage depressurization regulating valve which comprises a valve body, and the valve body is provided with a medium channel. The valve seat is detachably connected into the valve body, a plurality of matching grooves which are sequentially communicated are formed in the valve seat in the axial direction of the valve seat, and the widths of the matching grooves are gradually reduced in the medium flowing direction of the medium channel; and the valve element is arranged on the valve body, the valve element penetrates through the valve body, the valve element is provided with a plurality of matching parts which are sequentially arranged, the widths of the matching parts are gradually reduced in the medium flowing direction of the medium channel, and the matching parts and the matching grooves form pressure reduction flow channels. By arranging the valve seat and the valve element, the matching groove of the valve seat is matched with the matching part in the valve element, a medium cannot directly scour the valve seat, the service life of the valve seat is prolonged, meanwhile, a multi-stage pressure reduction structure is adopted, the pressure of the medium can be effectively reduced, and the adjusting precision of the valve is improved.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a multi-stage pressure reducing regulating valve. Background Technology

[0002] Control valves are widely used in hydropower stations, metallurgical industries, long-distance pipelines, and other applications. However, many existing control valves cannot maintain good sealing performance under conditions of high pressure differential, high flow velocity, and the presence of large particles in the medium, nor can they guarantee valve lifespan. In actual production and application, the following problems arise: First, under high pressure differential and high flow velocity, the valve seat sealing surface is easily eroded by particulate matter in the medium, leading to rapid valve seat damage and valve failure. Second, the valve's pressure reduction effect is insufficient, resulting in the final output medium flow rate not meeting requirements, and insufficient control accuracy. Summary of the Invention

[0003] This invention provides a multi-stage pressure reducing regulating valve to solve the technical problem of insufficient regulating accuracy of pressure reducing valves.

[0004] This invention provides a multi-stage pressure-reducing regulating valve, the multi-stage pressure-reducing regulating valve comprising: Valve body, wherein the valve body is provided with a medium passage; A valve seat is detachably connected to the valve body. The valve seat has multiple sequentially connected mating grooves inside along its axial direction. The width of the multiple mating grooves gradually decreases along the medium flow direction of the medium channel. The valve core is disposed on the valve body and extends through the valve body. The valve core has multiple sequentially arranged mating parts. Along the medium flow direction of the medium channel, the width of the multiple mating parts gradually decreases. The mating parts and the mating groove form a pressure-reducing flow channel. The pressure-reducing flow channel forms multiple pressure-reducing units connected in series. The multiple pressure-reducing units sequentially reduce the pressure of the medium.

[0005] In one embodiment of the present invention, the mating part is an annular groove formed on the valve core, and the annular groove and the mating groove are alternately arranged.

[0006] In one embodiment of the present invention, the pressure-reducing flow channel is serpentine.

[0007] In one embodiment of the present invention, the valve core further includes a driving part and a sealing part, the mating part is disposed between the driving part and the sealing part, and the driving part extends through the valve body.

[0008] In one embodiment of the present invention, a sealing assembly is provided between the valve body and the drive unit, the sealing assembly including packing, septum, pressure spring and pressure cap arranged sequentially from the inside to the outside along the valve core axial direction.

[0009] In one embodiment of the present invention, the packing is disposed between the drive part and the valve body, the septum is sleeved on the drive part, the pressure spring is located between the pressure cover and the septum, the pressure cover passes through the valve body to press the pressure spring onto the septum, and the pressure cover is provided with a plurality of fasteners for connecting with the valve body.

[0010] In one embodiment of the present invention, the valve body is provided with a connecting flange, the connecting flange having a fixing part, the fixing part passing through the valve body to fix the valve seat in the valve body.

[0011] In one embodiment of the present invention, a first sealing gasket is provided between the connecting flange and the valve seat.

[0012] In one embodiment of the present invention, a second sealing gasket is provided between the valve body and the connecting flange.

[0013] In one embodiment of the present invention, the connecting flange is provided with a connecting channel and has a sealing surface, which can be used to cooperate with the sealing part to control the opening and closing of the connecting channel and the medium channel.

[0014] The beneficial effects of this invention are as follows: The multi-stage pressure reducing regulating valve proposed in this invention, through the setting of valve seat and valve core, the mating groove of the valve seat and the mating part in the valve core are matched, the medium cannot directly flush the valve seat, thus extending the service life of the valve seat. At the same time, a pressure reducing flow channel is formed between the valve core and the valve seat, and the width of multiple mating parts gradually decreases, and the width of the mating groove also gradually decreases, forming a multi-stage pressure reduction, which can effectively reduce the pressure of the medium and improve the regulating accuracy of the valve. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0016] In the attached diagram: Figure 1 A cross-sectional view provided for an embodiment of the present invention; Figure 2 This is a schematic diagram of the valve core and valve seat mating according to one embodiment of the present invention; Figure 3 This is a partial schematic diagram of a pressure-reducing flow channel provided in one embodiment of the present invention; Figure 4 This is an enlarged view of point A provided in one embodiment of the present invention.

[0017] The attached figures are labeled as follows: Valve body 1, medium passage 101, valve seat 2, mating groove 201, valve core 3, mating part 301, annular groove 3011, drive part 302, sealing part 303, pressure reducing flow channel 4, connecting flange 5, fixing part 501, connecting channel 502, sealing surface 503, packing 6, septum 7, pressure spring 8, pressure cover 9, fastener 10. Detailed Implementation

[0018] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0019] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0020] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0021] like Figures 1-4 As shown, the present invention provides a multi-stage pressure reducing regulating valve.

[0022] In an exemplary embodiment, the multi-stage pressure-reducing regulating valve includes a valve body 1, a valve seat 2, and a valve core 3. The valve body 1 has a medium passage 101. The valve seat 2 is detachably connected to the valve body 1, and the valve seat 2 has a plurality of sequentially connected mating grooves 201 along its axial direction. The width of the plurality of mating grooves 201 gradually decreases along the medium flow direction of the medium passage 101. The valve core 3 is disposed on the valve body 1 and extends through the valve body 1. The valve core 3 has a plurality of sequentially arranged mating parts 301. The width of the plurality of mating parts 301 gradually decreases along the medium flow direction of the medium passage 101. The mating parts 301 and the mating grooves 201 form a pressure-reducing flow channel 4. The pressure-reducing flow channel 4 forms a plurality of pressure-reducing units connected in series. Each segment in the pressure-reducing flow channel 4 is a pressure-reducing unit, and the plurality of pressure-reducing units sequentially reduce the pressure of the medium.

[0023] In this embodiment, by setting the valve seat 2 and valve core 3, the mating groove 201 of the valve seat 2 and the mating part 301 in the valve core 3 are mated together, so that the medium cannot directly flush the valve seat 2, thus extending the service life of the valve seat 2. At the same time, a pressure-reducing flow channel 4 is formed between the valve core 3 and the valve seat 2, and the width of multiple mating parts 301 gradually decreases, and the width of the mating groove 201 also gradually decreases, forming a multi-stage pressure reduction, which enables the pressure of the medium to be effectively reduced and improves the adjustment accuracy of the valve.

[0024] For example, in this embodiment, the medium channel 101 is generally L-shaped, with the medium entering from the bottom and exiting from the right. The high-pressure medium containing particulate matter enters the pressure-reducing flow channel 4 formed between the valve seat 2 and the valve core 3 from the sealing pair formed between the bottom valve core 3 and the connecting flange 5. After multiple stages of pressure reduction, the required output pressure is achieved.

[0025] For example, such as Figure 1 and Figure 2 As shown, the valve core 3 is pagoda-shaped, with the apex being the output position of the medium. Similarly, a cavity is formed inside the valve seat 2 to accommodate the pagoda-shaped valve core 3. The valve core 3 can pass into the cavity, and multiple mating parts 301 of the valve core 3 correspond to the mating grooves 201 inside the valve seat 2 to form a pressure-reducing flow channel 4.

[0026] For example, in this embodiment, the mating groove 201 can adopt a stepped structure, with the width of each step decreasing sequentially. The mating part 301 can be designed as a protruding structure that matches the shape of the mating groove 201, such as an annular boss. In this embodiment, the pressure-reducing flow channel 4 adopts a curved flow channel, which can ensure that the medium does not make perpendicular contact with any part of the valve seat 2 or valve core 3 after entering the pressure-reducing flow channel 4. The pressure is relieved by the curved surface guidance, which effectively improves the service life of the valve seat 2 or valve core 3.

[0027] It is worth noting that in this embodiment, the medium channel 101 of the regulating valve can also be side-to-bottom outlet.

[0028] In an exemplary embodiment, the mating part 301 is an annular groove 3011 formed on the valve core 3, and the annular groove 3011 and the mating groove 201 are alternately arranged.

[0029] In this embodiment, the staggered arrangement of the annular groove 3011 and the mating groove 201 causes multiple directional changes in the medium flow path. Specifically, when the medium flows through the channel formed by the annular groove 3011 and the mating groove 201, turbulence is generated due to the alternating changes in the channel cross-section. As a result, the kinetic energy of the medium is effectively dissipated through multiple collisions and directional changes, achieving a smoother pressure reduction process. Therefore, the pressure-reducing channel 4 of this application significantly extends the medium flow path and increases flow resistance, thereby achieving a lower outlet velocity under the same pressure differential conditions. Simultaneously, the labyrinthine flow channel formed by the staggered arrangement effectively blocks direct impacts from solid particles in the medium, reducing erosion and wear on the inner wall of the mating groove 201.

[0030] For example, such as Figure 2 and Figure 3 As shown, in this embodiment, the annular groove 3011 serves as a mating part 301 on the valve core 3, and its cross-sectional shape is arc-shaped. The depth and width of the annular groove 3011 can be adjusted according to the characteristics of the medium. A deeper annular groove 3011 is suitable for high-viscosity media, while a shallower annular groove 3011 is suitable for low-viscosity media.

[0031] For example, in this embodiment, the valve core 3 located between the drive part 302 and the sealing part 303 is trapezoidal, and multiple annular grooves 3011 are provided at intervals along the axial direction of the valve core 3. The more annular grooves 3011 there are, the more pressure reduction stages there are, the lower the pressure output by the valve, and the higher the adjustment accuracy of the valve. In a specific embodiment, the number of annular grooves 3011 is set to 5-12.

[0032] It is worth noting that, for example Figure 2 As shown, the annular groove 3011 and the mating groove 201 of the valve seat 2 are arranged in a radially staggered manner. Therefore, the resulting pressure-reducing flow channel 4 is serpentine. In a specific embodiment, since the annular groove 3011 is opened on the outer wall of the valve core 3 and the mating groove 201 is opened on the inner wall of the valve seat 2, and both are arc-shaped grooves, the bottom of the mating part 301 corresponds to the top of the mating groove 201. Alternatively, the annular groove 3011 and the mating groove 201 are not completely aligned and staggered, but have a certain deviation. This can extend the length of a single S-shaped flow channel in the serpentine flow channel, improve the pressure reduction effect, and reduce the wear of the sidewall of the pressure-reducing flow channel 4. Specifically, the centrifugal force at the bend of the flow channel causes the medium to generate secondary flow, enhancing the internal friction effect of the fluid. Local pressure loss occurs when flowing through each bend, thus improving the pressure reduction effect.

[0033] It should also be noted that Figure 3 The diagram shows two pressure-reducing units. In this embodiment, because the pressure medium moves in a serpentine pattern in the medium channel 101, and the pressure medium is not perpendicular to any point on the sidewall of the pressure-reducing channel 4, the point with the highest medium pressure in a single curve ( Figure 3The T point in the medium is located inside the medium and is not located at the contact point between the medium and the pressure-reducing flow channel 4, thereby reducing the pressure of the medium on the side wall of the medium channel 101, improving the wear resistance of the medium channel 101, and extending the service life of the valve core 3 and the valve body 1.

[0034] In an exemplary embodiment, the valve core 3 further includes a drive portion 302 and a sealing portion 303, and a plurality of mating portions 301 are disposed in a trapezoidal portion between the drive portion 302 and the sealing portion 303, wherein the drive portion 302 extends out of the valve body 1.

[0035] In this embodiment, by modularly configuring the valve core 3 into a drive section 302, a sealing section 303, and intermediate mating sections 301, a balance between operational stability and sealing reliability is achieved. The drive section 302, sealing section 303, and the multiple intermediate mating sections 301 are integrated into a single unit. The exposed drive section 302 facilitates direct connection to the actuator, reducing error accumulation in the transmission process. The sealing section 303 forms a sealing pair with the connecting flange 5, capable of withstanding the impact of high pressure differential media. The mating sections 301 effectively reduce flow velocity through a multi-stage pressure reduction structure, mitigating erosion and wear on the sealing surface 503.

[0036] For example, in this embodiment, the drive unit 302 may be a cylindrical rod or a square rod, and one end of it that protrudes from the valve body 1 may be machined into a threaded structure to connect to the actuator, or a keyway may be provided to transmit torque.

[0037] For example, the sealing part 303 can be a conical sealing structure or a planar sealing structure, and the material can be hard alloy or welded wear-resistant layer to improve erosion resistance. The mating part 301, the drive part 302, and the sealing part 303 can be integrally machined. A dust cover can be provided at the part of the drive part 302 that protrudes from the valve body 1 to prevent external impurities from entering.

[0038] In an exemplary embodiment, a sealing assembly is provided between the valve body 1 and the drive unit 302. The sealing assembly includes a packing 6, a septum 7, a pressure spring 8, and a pressure cap 9 arranged sequentially from the inside to the outside along the axial direction of the valve core 3. Specifically, the packing 6 is disposed between the drive unit 302 and the valve body 1, the septum 7 is sleeved on the drive unit 302, the pressure spring 8 is located between the pressure cap 9 and the septum 7, the pressure cap 9 passes through the valve body 1 and presses the pressure spring 8 onto the septum 7, and the pressure cap 9 is provided with a plurality of fasteners 10 for connecting with the valve body 1.

[0039] This embodiment achieves reliable sealing through multi-layer synergy. Specifically: the packing 6 directly fills the mating gap to form the first sealing barrier; the septum 7 prevents the packing 6 from being extruded and ensures uniform force distribution; the pressure spring 8 provides a continuous and stable axial clamping force, compensating for the attenuation of sealing force due to wear or temperature changes; and the gland 9 maintains the structural stability of the entire sealing assembly through rigid constraint. In this embodiment, the pressure spring 8 is placed inside the valve body 1, which effectively reduces the installation space required for external installation. Simultaneously, the pressure spring 8 continuously provides preload to the packing 6 assembly, improving the sealing effect of the packing 6. In particular, the pressure spring 8 can be a wave spring; the variable stiffness characteristic of the wave spring can automatically adjust the clamping force, solving the problem of stress relaxation of conventional helical springs at high temperatures.

[0040] For example, the septum 7 may be made of stainless steel or hard alloy, with its inner diameter having a transition fit with the drive unit 302 and its outer diameter having a clearance fit with the valve body 1. The pressure spring 8 is preferably a wave spring or a helical spring. The gland 9 has a flange structure and is connected to the valve body 1 by at least three evenly distributed fastening bolts.

[0041] In an exemplary embodiment, the multi-stage pressure reducing regulating valve includes a valve body 1 with a connecting flange 5. The connecting flange 5 has a fixing part 501, which passes through the valve body 1 to fix the valve seat 2 inside the valve body 1.

[0042] In this embodiment, the axial clamping force of the valve seat 2 is converted into a radial constraint force through the direct connection structure between the flange fixing part 501 and the valve body 1. Specifically, when the high-pressure medium impacts the valve seat 2, the planar pressing method of the connecting flange 5 ensures that the valve seat 2 is subjected to uniform force, and the first sealing gasket can compensate for machining errors, improving the stability of the sealing surface 503. Therefore, fixing the valve seat 2 through the fixing part 501 maintains the advantage of being detachable while solving the problem of sealing failure caused by axial movement of the valve seat 2 under high pressure differential conditions, thus improving the service life of the control valve under particulate medium conditions.

[0043] For example, the fixing part 501 is a boss structure extending from the flange neck, and the outer diameter of the boss is interference-fitted with the mounting hole of the valve body 1.

[0044] In another embodiment, the end face of the fixing part 501 can be machined into a tapered contact surface to form a self-aligning press-fit with the tapered surface on the back of the valve seat 2. Meanwhile, under high-pressure conditions, an anti-fretting wear coating can be added to the contact surface between the fixing part 501 and the valve body 1.

[0045] For example, in this embodiment, the connecting flange 5 and the valve body 1 are connected by multiple connecting bolts.

[0046] It is worth noting that in this embodiment, there is a first step inside the valve body 1. Correspondingly, a geothermal step is provided on the outer wall of the valve seat 2. During assembly, the second step abuts against the first step for initial positioning. After the connecting flange 5 is installed, the fixing part 501 pushes the valve seat 2 so that the second step abuts tightly against the first step, thus preventing the connection between the valve seat 2 and the valve body 1 from failing.

[0047] In an exemplary embodiment, a first sealing gasket is provided between the connecting flange 5 and the valve seat 2, and a second sealing gasket is provided between the valve body 1 and the connecting flange 5.

[0048] In this embodiment, the microscopic gap between the metal contact surfaces of the connecting flange 5 and the valve seat 2 is effectively filled by the elastic deformation of the first sealing gasket. Under high-pressure conditions, the first sealing gasket maintains sufficient contact pressure, forming a reliable sealing interface. Since the high-pressure medium first enters the gap between the connecting flange 5 and the valve seat 2 after entering the pressure-reducing channel 4, the added first sealing gasket can effectively prevent high-pressure medium leakage. To improve the sealing effect, the number of first sealing gaskets can be increased. At the same time, the buffering effect of the first sealing gasket can also reduce stress concentration at the flange connection, which is beneficial to extending the overall service life of the valve.

[0049] In this embodiment, the second sealing gasket acts between the valve body 1 and the valve seat 2. The medium here has been depressurized, and an O-ring can be used to achieve a seal.

[0050] For example, in this embodiment, the first sealing gasket can be designed as an annular structure, and its cross-sectional shape includes, but is not limited to, a rectangle, trapezoid, or V-shape. In a specific embodiment, the sealing gasket thickness is 2-5 mm, and the Shore hardness is between 50 and 80 to ensure sufficient compression and rebound performance. During installation, the sealing gasket is pre-pressed between the mating surfaces of the connecting flange 5 and the valve seat 2, and compressive deformation is generated by the tightening force of the flange bolts.

[0051] In an exemplary embodiment, the connecting flange 5 is provided with a connecting channel 502 and a sealing surface 503, which can be used to cooperate with the sealing part 303 to control the opening and closing of the connecting channel 502 and the medium channel 101.

[0052] In this embodiment, precise control of the medium channel 101 is achieved through the linkage sealing structure between the connecting flange 5 and the valve core 3. Specifically, when the sealing part 303 and the sealing surface 503 are fully in contact, the connecting channel 502 and the medium channel 101 are reliably cut off; when the sealing part 303 and the sealing surface 503 are no longer in contact, the medium can flow freely through the connecting channel 502. In this embodiment, the valve core 3 and the sealing surface 503 adopt a conical seal, and the conical seal structure can produce a self-reinforcing sealing effect, with the sealing specific pressure increasing synchronously when the medium pressure increases.

[0053] For example, in this embodiment, the specific implementation of the connecting channel 502 includes, but is not limited to: a straight through-hole axially penetrating the connecting flange 5, a stepped through-hole with a transition fillet, or a non-circular through-hole with a flow guiding structure. The specific implementation of the sealing surface 503 includes, but is not limited to: a planar sealing surface 503, a conical sealing surface 503, or a spherical sealing surface 503. The cooperation method between the sealing surface 503 and the sealing part 303 includes, but is not limited to: a planar-planar contact seal, a conical-conical line contact seal, or a spherical-spherical point contact seal.

[0054] In summary, the present invention, through the arrangement of valve seat 2 and valve core 3, allows the mating groove 201 of valve seat 2 to engage with the mating part 301 in valve core 3, preventing the medium from directly scouring valve seat 2 and extending the service life of valve seat 2. At the same time, the multi-stage pressure reduction structure enables the pressure of the medium to be effectively reduced, improving the adjustment accuracy of the valve.

[0055] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A multi-stage pressure reducing regulating valve, characterized in that, include: Valve body, wherein the valve body is provided with a medium passage; A valve seat is detachably connected to the valve body. The valve seat has multiple sequentially connected mating grooves inside along its axial direction. The width of the multiple mating grooves gradually decreases along the medium flow direction of the medium channel. A valve core is disposed on the valve body and extends through the valve body. The valve core has multiple sequentially arranged mating parts. Along the medium flow direction of the medium channel, the width of the multiple mating parts gradually decreases. The mating parts and the mating groove form a pressure-reducing flow channel. The pressure-reducing flow channel forms multiple pressure-reducing units connected in series. The multiple pressure-reducing units sequentially reduce the pressure of the medium.

2. The multi-stage pressure reducing regulating valve according to claim 1, characterized in that: The mating part is an annular groove formed on the valve core, and the annular groove and the mating groove are arranged alternately.

3. The multi-stage pressure reducing regulating valve according to claim 1, characterized in that: The pressure-reducing flow channel is serpentine.

4. The multi-stage pressure reducing regulating valve according to claim 1, characterized in that: The valve core also includes a driving part and a sealing part, the mating part is disposed between the driving part and the sealing part, and the driving part extends out of the valve body.

5. The multi-stage pressure reducing regulating valve according to claim 4, characterized in that: A sealing assembly is provided between the valve body and the drive unit. The sealing assembly includes packing, a septum, a pressure spring, and a pressure cap arranged sequentially from the inside to the outside along the valve core axis.

6. The multi-stage pressure reducing regulating valve according to claim 5, characterized in that: The packing is disposed between the drive unit and the valve body, the septum is sleeved on the drive unit, the pressure spring is located between the pressure cover and the septum, the pressure cover passes through the valve body and presses the pressure spring onto the septum, and the pressure cover is provided with a plurality of fasteners for connecting to the valve body.

7. The multi-stage pressure reducing regulating valve according to claim 4, characterized in that: The valve body is provided with a connecting flange, and the connecting flange has a fixing part, which passes through the valve body to fix the valve seat in the valve body.

8. The multi-stage pressure reducing regulating valve according to claim 7, characterized in that: A first sealing gasket is provided between the connecting flange and the valve seat.

9. The multi-stage pressure reducing regulating valve according to claim 7, characterized in that: A second sealing gasket is provided between the valve body and the connecting flange.

10. The multi-stage pressure reducing regulating valve according to claim 7, characterized in that: The connecting flange is provided with a connecting channel and has a sealing surface, which can be used to cooperate with the sealing part to control the opening and closing of the connecting channel and the medium channel.

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