Sealing structure of cage type regulating valve

Abstract

The utility model discloses a cage type regulating valve sealing structure which comprises a valve body, a valve cover, a valve element assembly arranged in the valve body and a sealing assembly for sealing the valve element assembly. The sealing assembly comprises an upper valve cage arranged in the valve body, a lower valve cage arranged in the valve body and a sealing ring arranged between the upper valve cage and the lower valve cage. The upper face of the sealing ring is an inclined face, and the face, facing the sealing ring, of the upper valve cage is an inclined face matched with the sealing ring. The matching position of the lower valve cage and the sealing ring is a combined face of a horizontal face and a downwards-inclined inclined face, and the horizontal face in the combined face is matched with the bottom of the sealing ring. Sealing is achieved through the upper valve cage, the lower valve cage and the sealing ring, the sealing ring, the upper valve cage and the lower valve cage are combined to achieve the sealing effect when the cage type regulating valve is pressed, and the purposes of improving the sealing performance of the cage type regulating valve and improving the use quality of the regulating valve are achieved.

Description

Technical Field

[0001] The utility model relates to advanced manufacturing and automatic control, in particular to a cage-type regulating valve sealing structure. Background Art

[0002] Currently, cage-type control valves on the market generally use rectangular cross-section flexible graphite rings as sealing rings for high-temperature operation. These rings are secured to the valve core using a pressure plate and require compression to achieve a seal. Insufficient compression of the flexible graphite ring can easily cause internal valve leakage, while excessive compression can create significant friction and slow valve operation.

[0003] How to improve the sealing performance of cage-type control valves is a technical problem that needs to be solved urgently at this stage.

[0004] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Utility Model Content

[0005] In order to solve the above technical problems, the utility model proposes a cage-type regulating valve sealing structure to achieve the purpose of improving the sealing performance of the cage-type regulating valve and improving the use quality of the regulating valve.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the present utility model is as follows:

[0007] A cage-type regulating valve sealing structure comprises a valve body, a valve cover, a valve core assembly arranged in the valve body, and a sealing assembly for sealing the valve core assembly;

[0008] The sealing assembly includes an upper cage disposed in the valve body, a lower cage disposed in the valve body, and a sealing ring disposed between the upper cage and the lower cage; the upper surface of the sealing ring is an inclined surface, and the side of the upper cage facing the sealing ring is an inclined surface that matches the sealing ring;

[0009] The matching portion between the lower cage and the sealing ring is a combination surface of a horizontal surface and a downwardly inclined surface, and the horizontal surface in the combination surface matches the bottom of the sealing ring.

[0010] The utility model forms a seal by an upper valve cage, a lower valve cage and a sealing ring. The sealing ring and the upper and lower valve cages work together to expand and seal when under pressure, thereby achieving the purpose of improving the sealing performance of the cage-type regulating valve and improving the service quality of the regulating valve.

[0011] It is worth noting that the valve body and the valve cover are fixedly connected by screw holes provided on the valve body and the valve cover and fasteners matching the screw holes; a packing piece is provided between the valve stem and the valve cover, a packing nut is provided on the top of the valve cover, and the top end of the valve stem passes through the packing nut and is placed outside.

[0012] It is worth noting that the valve core assembly includes a valve stem and a valve core arranged at the bottom end of the valve stem, and the bottom end of the valve stem passes through the valve stem and is arranged in the valve body; the valve core is arranged at the bottom end of the valve stem, and the side wall of the valve core is tightly attached to the inner wall of the upper valve cage, and the valve core moves up and down along the inner wall of the upper valve cage under the action of the valve stem.

[0013] It is preferable that a valve seat is provided inside the valve body, and a winding gasket is provided between the valve seat and the valve body; the valve core is in contact with the valve seat when it is at the lowest end.

[0014] The utility model has the following advantages:

[0015] 1. The utility model is sealed by an upper cage, a lower cage and a sealing ring. The sealing ring and the upper and lower cages work together to expand and seal when under pressure, thereby improving the sealing performance of the cage-type regulating valve and the quality of the regulating valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

[0017] Figure 1 This is a structural schematic diagram of a cage-type regulating valve sealing structure disclosed in an embodiment of the utility model;

[0018] Figure 2 This is a structural schematic diagram of a sealing assembly in a cage-type regulating valve sealing structure disclosed in an embodiment of the utility model;

[0019] The numbers and letters in the figure represent the corresponding component names:

[0020] 1. Valve body 2. Valve cover 31. Valve stem 32. Valve core 4. Seal assembly 41. Upper cage 42. Lower cage

[0021] 43. Sealing ring 5. Fastener 6. Toothed gasket 7. Packing 8. Packing nut 9. Valve seat

[0022] 10. Wrap-around pad. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0024] The utility model provides a cage-type regulating valve sealing structure, the working principle of which is to form a seal by an upper valve cage, a lower valve cage and a sealing ring, and to use the sealing ring and the upper and lower valve cages to expand and seal when under pressure, thereby achieving the purpose of improving the sealing performance of the cage-type regulating valve and improving the quality of use of the regulating valve.

[0025] The present invention will be further described in detail below with reference to the embodiments and specific implementation methods.

[0026] like Figure 1 and Figure 2 As shown, a cage-type regulating valve sealing structure includes a valve body 1, a valve cover 2, a valve core assembly arranged in the valve body, and a sealing assembly 4 for sealing the valve core assembly.

[0027] The valve body and the valve cover are fixedly connected via screw holes provided on the valve body and the valve cover and fasteners 5 matched with the screw holes.

[0028] The sealing assembly includes an upper cage 41, positioned within the valve body; a lower cage 42, positioned within the valve body; and a sealing ring 43 made of flexible graphite, positioned between the upper and lower cages. The sealing ring has a sloped top surface. The upper cage's surface facing the sealing ring is a sloped surface that mates with the sealing ring. The lower cage's mating surface with the sealing ring is a combination of a horizontal surface and a downwardly sloping surface, with the horizontal surface of the combined surface mating with the bottom of the sealing ring. A toothed gasket 6 is positioned between the bonnet and the upper cage. Because the lower cage's combined surface is a horizontal and sloped surface, the sealing ring expands under high temperature or high pressure, achieving a seal between the upper and lower cages. The sloped surface provides an area for the sealing ring to expand, improving the sealing effect. The valve core assembly includes a valve stem 31 and a valve core 32 disposed at the bottom end of the stem. The bottom end of the valve stem passes through the stem and is positioned within the valve body. The valve core is positioned at the bottom end of the stem, with its sidewalls in close contact with the inner wall of the upper cage. The valve core moves up and down along the inner wall of the upper cage under the action of the valve stem. A packing 7 is disposed between the valve stem and the valve cover, and a packing nut 8 is located at the top of the valve cover. The top end of the valve stem passes through the packing nut and is positioned externally. A valve seat 9 is disposed within the valve body, with a spiral wound gasket 10 located between the valve seat and the valve body. When the valve core is at its lowest end, it contacts the valve seat.

[0029] The upper surface of the sealing ring is a bevel that matches the bevel of the upper valve cage, and the matching part of the lower valve cage is a straight edge plus a bevel. When subjected to high temperature or high pressure, the sealing ring can expand and effectively seal.

[0030] Through the above method, the cage-type regulating valve sealing structure provided by the utility model is sealed by forming an upper valve cage, a lower valve cage and a sealing ring. The sealing ring and the upper and lower valve cages work together to expand and seal when under pressure, thereby achieving the purpose of improving the sealing performance of the cage-type regulating valve and improving the use quality of the regulating valve.

[0031] The above is only a preferred embodiment of the cage-type regulating valve sealing structure disclosed in the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the creative concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A cage-type regulating valve sealing structure, characterized in that: It comprises a valve body, a valve cover, a valve core assembly arranged in the valve body and a sealing assembly for sealing the valve core assembly; The sealing assembly includes an upper cage disposed in the valve body, a lower cage disposed in the valve body, and a sealing ring disposed between the upper cage and the lower cage; the upper surface of the sealing ring is an inclined surface, and the side of the upper cage facing the sealing ring is an inclined surface that matches the sealing ring; The matching portion between the lower cage and the sealing ring is a combination surface of a horizontal surface and a downwardly inclined surface, and the horizontal surface of the combination surface matches the bottom of the sealing ring; The valve core assembly includes a valve stem and a valve core arranged at the bottom end of the valve stem, the bottom end of the valve stem passes through the valve stem and is arranged in the valve body; the valve core is arranged at the bottom end of the valve stem, and the side wall of the valve core is tightly attached to the inner wall of the upper valve cage, and the valve core moves up and down along the inner wall of the upper valve cage under the action of the valve stem.

2. A cage-type regulating valve sealing structure according to claim 1, characterized in that: The valve body and the valve cover are fixedly connected by screw holes provided on the valve body and the valve cover and fasteners matching the screw holes; a packing piece is provided between the valve stem and the valve cover, a packing nut is provided on the top of the valve cover, and the top end of the valve stem passes through the packing nut and is placed outside.

3. The cage-type regulating valve sealing structure according to claim 1, characterized in that: A valve seat is provided inside the valve body, and a winding pad is provided between the valve seat and the valve body; the valve core is in contact with the valve seat when it is at the lowest end.

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