Double-seal stop valve with replaceable valve seat

Abstract

A valve seat ring is in an annular shape and is installed on a valve seat table, a pressing ring is arranged on the periphery of the valve seat ring in a sleeving mode and presses the valve seat ring to the valve seat table in the thickness direction, the lower end of a covering cylinder in the height direction abuts against the pressing ring, and the upper end of the covering cylinder in the height direction is pressed downwards through a boss ring. The utility model provides a dual-seal stop valve with a replaceable valve seat. A boss ring is arranged on the inner wall of a valve cover seat of a valve cover; the compression ring fixes the valve seat ring in the diameter direction and the thickness direction, and therefore good fixing and sealing effects are achieved. The upper end of the covering cylinder is pressed by the boss ring of the valve cover, the pressing ring is fixed at the lower end of the covering cylinder, finally, the valve seat ring is fixed, and the covering cylinder is installed in the valve body without interfering with the sealing effect at the position of the valve cover; the pressing ring sealing ring is installed on the valve seat table and clamps the pressing ring and the valve seat ring in the radial direction, so that sealing is formed at the positions of the valve seat ring and the pressing ring, and the leakage risk at the positions is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the field of stop valves, in particular to a double-sealed stop valve with a replaceable valve seat. Background Art

[0002] Globe valves with replaceable seats are often used in environments with high temperatures, high differential pressures, and high particle concentrations. In these environments, the valve seats must withstand multiple harsh conditions, including cavitation, high erosion, and high wear, making them susceptible to damage and leakage. Consequently, these globe valves require frequent repair and replacement to ensure proper operation and system safety.

[0003] Specifically, the replaceable valve seat is provided with a structure for installing the valve seat at an appropriate position of the valve body, so that the valve seat can be disassembled and installed in case of working problems of the valve seat or when it needs to be replaced regularly.

[0004] However, in traditional replaceable-seat globe valves, the seal between the valve seat and the valve body is typically achieved through the compression force exerted by a cage structure. While this sealing method can meet requirements to a certain extent, its effectiveness is often affected by the compression method of the center flange. Furthermore, the presence of the center flange can affect the seal between the bonnet and the valve body, further increasing the risk of system leakage. Utility Model Content

[0005] The main purpose of the utility model is to provide a double-sealed stop valve with a replaceable valve seat, aiming to solve the problem of poor sealing effect of the replaceable valve seat at the valve cover and valve seat position.

[0006] In order to achieve the above object, the utility model provides a double-sealed stop valve with replaceable valve seat, comprising:

[0007] The valve body has a flow channel running through it, an annular valve seat platform is provided in the middle of the length direction of the flow channel, and a valve cover seat corresponding to the valve seat platform is provided on the valve body;

[0008] A valve cover is mounted on the valve cover seat and is provided with a boss ring corresponding to the inner wall of the valve cover seat;

[0009] A valve stem portion is mounted on the valve cover, the valve stem portion comprising a valve stem and a valve core connected to the lower end of the valve stem, the valve stem being arranged to be separated and combined relative to the valve seat;

[0010] A valve seat ring, which is annular and mounted on the valve seat platform;

[0011] a compression ring, which is sleeved on the outer circumference of the valve seat ring and presses the valve seat ring toward the valve seat platform in a thickness direction;

[0012] A covering cylinder, the lower end of which in the height direction abuts against the compression ring and the upper end of which in the height direction is pressed down by the boss ring, and the covering cylinder is in a mesh shape;

[0013] The pressure ring sealing ring is installed on the valve seat platform and is clamped by the pressure ring and the valve seat ring in the radial direction.

[0014] Furthermore, the outer periphery of the valve core is matched with the inner periphery of the cage cylinder.

[0015] Furthermore, the cage cylinder includes an upper cylinder section, a middle screen section and a lower cylinder section connected in sequence in the height direction, and the upper cylinder section and the lower cylinder section correspond to the boss ring and the pressure ring respectively, wherein when the valve core is combined with the valve seat ring, the outer periphery of the valve core forms a seal with the inner periphery of the lower cylinder section.

[0016] Furthermore, the boss ring and the cage tube are friction welded.

[0017] Furthermore, the valve cover seat is funnel-shaped, and the bottoms of the compression ring and the valve seat ring are adapted to the valve cover seat and are frustum-shaped.

[0018] Furthermore, the cross sections of the compression ring and the valve seat ring are both in the shape of an "L" and present an embracing structure.

[0019] Furthermore, a cylindrical guide groove is provided on the inner wall of the valve body corresponding to the outer periphery of the cage tube.

[0020] Furthermore, the material of the pressure ring sealing ring is polyurethane or polytetrafluoroethylene.

[0021] Furthermore, the compression ring and the valve seat ring are both made of steel.

[0022] Furthermore, the valve stem and the valve core are detachably arranged.

[0023] The double-seal replaceable valve seat stop valve provided by the utility model has a valve cover with a boss ring on the inner wall of the valve cover seat; the valve seat ring is annular and is installed on the valve seat platform, and the compression ring fixes the valve seat ring in the diameter and thickness directions, thereby forming a better fixing and sealing effect; the upper end of the covering cylinder is pressed down by the boss ring of the valve cover, and the lower end fixes the compression ring, finally realizing the fixation of the valve seat ring, and the covering cylinder is installed in the valve body without interfering with the sealing effect at the valve cover position; the pressure ring sealing ring is installed on the valve seat platform and is clamped by the compression ring and the valve seat ring in the radial direction, thereby forming a seal at the position of the valve seat ring and the compression ring, greatly reducing the leakage risk at this position. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of a double-sealed, replaceable-seat stop valve according to a first embodiment of the present invention;

[0025] Figure 2 yes Figure 1 Local magnification in;

[0026] Figure 3 This is a schematic diagram of a cage in a double-sealed replaceable valve seat stop valve according to a second embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of a double-sealed, replaceable-seat stop valve according to a third embodiment of the present invention;

[0028] Figure 5 yes Figure 4 Local magnification in . DETAILED DESCRIPTION

[0029] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] Those skilled in the art will appreciate that, unless expressly stated otherwise, the singular forms “a”, “an”, “said”, “above” and “the” used herein may also include plural forms. It should be further understood that the term “comprising” used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements, units, modules and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, units, modules, components and / or groups thereof. It should be understood that when we refer to an element as being “connected” or “coupled” to another element, it may be directly connected or coupled to the other element, or there may be intermediate elements. In addition, “connected” or “coupled” as used herein may include wireless connection or wireless coupling. The term “and / or” used herein includes all or any unit and all combinations of one or more associated listed items.

[0031] Those skilled in the art will understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as generally understood by those skilled in the art in the field to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0032] Reference Figures 1 to 5 In one embodiment of the present invention, a double-sealed stop valve with a replaceable valve seat comprises:

[0033] The valve body 100 has a flow channel 110 passing through it. An annular valve seat 120 is provided in the middle of the length direction of the flow channel 110. A valve cover seat 130 corresponding to the valve seat 120 is provided on the valve body 100.

[0034] The valve cover 200 is mounted on the valve cover seat 130 and has a boss ring 210 disposed on the inner wall of the valve cover seat 130;

[0035] The valve stem portion 300 is mounted on the valve cover 200. The valve stem portion 300 includes a valve stem 310 and a valve core 320 connected to the lower end of the valve stem 310. The valve stem 310 is arranged to be separated and connected relative to the valve seat 120.

[0036] The valve seat ring 400 is annular and mounted on the valve seat platform 120;

[0037] A compression ring 500 is sleeved on the outer circumference of the valve seat ring 400 and presses the valve seat ring 400 toward the valve seat platform 120 in the thickness direction;

[0038] The covering tube 600 has a lower end in the height direction abutting against the pressing ring 500 and an upper end in the height direction being pressed down by the boss ring 210 . The covering tube 600 is in a mesh shape.

[0039] The pressure ring sealing ring 700 is installed on the valve seat platform 120 and is clamped by the pressure ring 500 and the valve seat ring 400 in the radial direction.

[0040] In the prior art, in a stop valve with a replaceable valve seat, the seal between the valve seat and the valve body is usually achieved by a compressive force applied by a cage structure. Although this sealing method can meet the requirements to a certain extent, its sealing effect is often affected by the compression method of the middle flange. In addition, the presence of the middle flange will also affect the sealing effect between the valve cover and the valve body, further increasing the risk of leakage in the system.

[0041] In the present invention, the stop valve is fixed in the up and down directions when in use, and thus provides a certain direction indication in an up and down manner. The double-seal replaceable valve seat stop valve includes a valve body 100, a valve cover 200, a valve stem 300, a valve seat ring 400, a pressure ring 500, a cage 600, and a pressure ring seal 700.

[0042] The valve body 100 is penetrated by a flow channel 110. Flow channel 110 is a passage for fluid flow. An annular valve seat platform 120 is located in the middle of the length of flow channel 110. This platform provides a foundation for the subsequent installation of the valve seat ring 400. A valve cover seat 130 is provided on the valve body 100, corresponding to the valve seat platform 120.

[0043] The valve cover 200 is mounted on the valve cover seat 130 and a boss ring 210 is provided on the inner wall of the valve cover seat 130. The valve cover 200 and the boss ring 210 are an integral structure, for example, formed by integral casting or turning.

[0044] The valve stem 300 is mounted on the valve cover 200. The valve stem 300 includes a valve stem 310 and a valve core 320 connected to the lower end of the valve stem 310. The valve stem 310 is arranged to be separated and closed relative to the valve seat 120. The valve stem 310 can be operated in various ways. For example, the valve stem 310 can be directly threaded onto the valve cover 200 to achieve lifting or lowering, or it can be mated with a nut on the valve cover, and the valve stem 310 can be raised or lowered by rotating the nut.

[0045] The valve seat ring 400 is annular and mounted on the valve seat base 120 .

[0046] The compression ring 500 fits over the outer circumference of the valve seat ring 400 and simultaneously presses the valve seat ring 400 against the valve seat platform 120 in the thickness direction. The compression ring 500 secures the valve seat ring 400; it not only fits over the valve seat ring 400 but also compresses it in the thickness direction. The subsequent cage 600 secures the compression ring 500.

[0047] The lower end of the cage 600 abuts against the pressure ring 500, while the upper end is pressed downward by the boss ring 210. The cage 600 is mesh-shaped, allowing fluid to pass through it. The cage 600 is installed in the valve body 100 without interfering with the sealing effect of the valve cover 200.

[0048] The pressure ring seal 700 is installed on the valve seat platform 120 and is clamped by the pressure ring 500 and the valve seat ring 400 in the radial direction, thereby forming a seal at the position of the valve seat ring 400 and the pressure ring 500, greatly reducing the leakage risk at this position.

[0049] In summary, the valve cover 200 is provided with a boss ring 210 on the inner wall of the valve cover seat 130; the valve seat ring 400 is annular and is installed on the valve seat platform 120, and the compression ring 500 fixes the valve seat ring 400 in the diameter direction and thickness direction, thereby forming a better fixing and sealing effect; the upper end of the covering cylinder 600 is pressed down by the boss ring 210 of the valve cover 200, and the lower end fixes the compression ring 500, finally realizing the fixation of the valve seat ring 400, and the covering cylinder 600 is installed in the valve body 100, without interfering with the sealing effect at the position of the valve cover 200; the pressure ring sealing ring 700 is installed on the valve seat platform 120 and is clamped by the compression ring 500 and the valve seat ring 400 in the radial direction, thereby forming a seal at the position of the valve seat ring 400 and the compression ring 500, greatly reducing the leakage risk at this position.

[0050] Reference Figure 1In one embodiment, the outer periphery of the valve core 320 is matched with the inner periphery of the cage tube 600.

[0051] In this embodiment, the cage 600 is used to guide the movement of the valve core 320, and the valve stem 310 is assisted in guiding the movement of the valve core 320, so that the position of the valve stem 310 is more accurate during the lifting process.

[0052] Reference Figure 3 In one embodiment, the cage cylinder 600 includes an upper cylinder section 610, a middle screen section 620 and a lower cylinder section 630 connected in sequence in the height direction, and the upper cylinder section 610 and the lower cylinder section 630 correspond to the boss ring 210 and the pressure ring 500 respectively, wherein when the valve core 320 is combined with the valve seat ring 400, the outer periphery of the valve core 320 forms a seal with the inner periphery of the lower cylinder section 630.

[0053] In this embodiment, the cage 600 is structurally constrained, with its upper and lower ends being solid structures. This reduces the likelihood of structural deformation when the upper section 610 is coupled to the valve cover 200, while the lower section 630 forms a seal with the valve core 320, assisting in forming the valve seat.

[0054] In one embodiment, the boss ring 210 and the cage cylinder 600 are friction welded.

[0055] In this embodiment, the boss ring 210 of the valve cover 200 is friction-welded to the cage 600. This ensures precise positioning of the cage 600 and reduces installation complexity. Furthermore, compared to a structure where the valve cover 200 and cage 600 are integrally molded, material consumption is reduced. Specifically, the boss ring 210 and cage 600 can be made of different materials, resulting in improved material properties for the cage 600 and reducing corrosion and wear. After friction welding, the boss ring 210 and cage 600 require some turning and shaping.

[0056] Reference Figures 4 to 5 In one embodiment, the valve cover seat 130 is funnel-shaped, and the bottoms of the pressure ring 500 and the valve seat ring 400 are adapted to the valve cover seat 130 and are frustum-shaped.

[0057] In this embodiment, the structural constraints of the valve cover seat 130 allow the compression ring 500 and the valve seat ring 400 to fit more tightly against the valve cover seat 130. Specifically, under the action of the cage 600, the compression ring 500 and the valve seat ring 400 are more effectively sealed against the valve cover seat 130.

[0058] Reference Figures 1 to 2In one embodiment, the cross-sections of the compression ring 500 and the valve seat ring 400 are both in the shape of an "L" and present an embracing structure.

[0059] In this embodiment, the cross-sections of the pressure ring 500 and the valve seat ring 400 are restricted, allowing them to form an embracing structure. This allows the pressure ring 500 to restrict the valve seat ring 400 in both the circumferential direction and the thickness direction, ultimately optimizing the fixing effect of the pressure ring 500 on the valve seat ring 400. During the embracing process, the pressure ring seal 700 is naturally clamped and restrained by the pressure ring 500 and the valve seat ring 400.

[0060] Reference Figure 1 In one embodiment, a cylindrical guide groove 140 is provided on the inner wall of the valve body 100 corresponding to the outer periphery of the cage tube 600 .

[0061] In this embodiment, the guide groove 140 is machined on the inner wall of the valve body 100 so that the fluid guided from the cage 600 can flow to the outlet more efficiently.

[0062] In one embodiment, the pressure ring seal 700 is made of polyurethane or polytetrafluoroethylene.

[0063] In this embodiment, the material of the pressure ring seal 700 is restricted, so that the sealing effect is achieved while its strength and weather resistance are guaranteed to a certain extent.

[0064] In one embodiment, the compression ring 500 and the valve seat ring 400 are both made of steel.

[0065] In this embodiment, the material restrictions of the pressure ring 500 and the valve seat ring 400 ensure that the structural strength and external dimensions meet the use requirements. At the same time, the pressure ring 500, the valve seat ring 400 and the valve seat platform 120 are more closely and accurately matched.

[0066] In one embodiment, the valve stem 310 and the valve core 320 are detachable.

[0067] In this embodiment, the valve core 320 can be replaced according to the use requirements. The valve stem 310 and the valve core 320 can be combined in various ways, such as a snap connection or a buckle connection.

[0068] To sum up, the double-seal replaceable valve seat stop valve provided by the utility model has a boss ring 210 on the inner wall of the valve cover seat 130 of the valve cover 200; the valve seat ring 400 is annular and installed on the valve seat platform 120, and the pressure ring 500 fixes the valve seat ring 400 in the diameter and thickness directions, thereby forming a better fixing and sealing effect; the upper end of the covering cylinder 600 is pressed down by the boss ring 210 of the valve cover 200, and the lower end fixes the pressure ring 500, finally realizing the fixation of the valve seat ring 400, and the covering cylinder 600 is installed in the valve body 100 without interfering with the sealing effect at the position of the valve cover 200; the pressure ring sealing ring 700 is installed on the valve seat platform 120 and is clamped by the pressure ring 500 and the valve seat ring 400 in the radial direction, thereby forming a seal at the position of the valve seat ring 400 and the pressure ring 500, greatly reducing the leakage risk at this position.

[0069] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A double-sealed replaceable valve seat stop valve, characterized in that: include: A valve body (100) is penetrated by a flow channel (110), an annular valve seat platform (120) is provided in the middle of the length direction of the flow channel (110), and a valve cover seat (130) corresponding to the valve seat platform (120) is provided on the valve body (100); A valve cover (200) is mounted on the valve cover seat (130) and is provided with a boss ring (210) corresponding to the inner wall of the valve cover seat (130); a valve stem portion (300) mounted on the valve cover (200), the valve stem portion (300) comprising a valve stem (310) and a valve core (320) connected to the lower end of the valve stem (310), the valve stem (310) being arranged to be separated and joined relative to the valve seat (120); A valve seat ring (400) is annular and mounted on the valve seat platform (120); A pressing ring (500) is sleeved on the outer circumference of the valve seat ring (400) and presses the valve seat ring (400) toward the valve seat platform (120) in a thickness direction; The covering cylinder (600) has a lower end in the height direction abutting against the compression ring (500) and an upper end in the height direction being pressed down by the boss ring (210), and the covering cylinder (600) is in a mesh shape; A pressure ring sealing ring (700) is mounted on the valve seat platform (120) and is clamped by the pressure ring (500) and the valve seat ring (400) in the radial direction.

2. The double-sealed replaceable seat stop valve according to claim 1, characterized in that: The outer periphery of the valve core (320) is matched with the inner periphery of the cage cylinder (600).

3. The double-sealed replaceable seat stop valve according to claim 2, characterized in that: The cage cylinder (600) includes an upper cylinder section (610), a middle screen section (620) and a lower cylinder section (630) connected in sequence in the height direction, and the upper cylinder section (610) and the lower cylinder section (630) correspond to the boss ring (210) and the pressure ring (500) respectively, wherein when the valve core (320) is combined with the valve seat ring (400), the outer periphery of the valve core (320) forms a seal with the inner periphery of the lower cylinder section (630).

4. The double-sealed replaceable seat stop valve according to claim 1, characterized in that: The boss ring (210) and the cage cylinder (600) are friction welded.

5. The double-seal replaceable valve seat stop valve according to claim 1, characterized in that: The valve cover seat (130) is funnel-shaped, and the bottoms of the pressure ring (500) and the valve seat ring (400) are adapted to the valve cover seat (130) and are frustum-shaped.

6. The double-seal replaceable seat stop valve according to any one of claims 1 to 4, characterized in that: The cross-sections of the compression ring (500) and the valve seat ring (400) are both in the shape of an "L" and present an embracing structure.

7. The double-seal replaceable seat stop valve according to any one of claims 1 to 4, characterized in that: A cylindrical guide groove (140) is provided on the inner wall of the valve body (100) corresponding to the outer periphery of the cage cylinder (600).

8. The double-seal replaceable seat stop valve according to any one of claims 1 to 4, characterized in that: The material of the pressure ring seal (700) is polyurethane or polytetrafluoroethylene.

9. The double-sealed replaceable seat stop valve according to any one of claims 1 to 4, characterized in that: The compression ring (500) and the valve seat ring (400) are both made of steel.

10. The double seal replaceable seat stop valve according to claim 1, characterized in that: The valve stem (310) and the valve core (320) are detachably arranged.

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