Diaphragm valve with replaceable valve seat structure

Abstract

The utility model provides a diaphragm valve with a replaceable valve seat structure, which comprises a valve body, a valve seat component, a diaphragm and an actuating mechanism, the valve body is provided with a valve cavity communicated with an inlet and an outlet, the valve seat component is detachably arranged in the valve cavity, the diaphragm is arranged on the valve seat component, the actuating mechanism is arranged on the diaphragm, and the valve seat component is detachably arranged in the valve cavity. The valve is arranged on the valve seat assembly and axially forces the diaphragm to be tightly attached to or away from the valve seat assembly, when the diaphragm is tightly attached to the valve seat assembly, the valve is in a closed state, and when the diaphragm is away from the valve seat assembly, the valve is in an open state. The valve seat is buckled and pressed on the upper end face and the lower end face of the valve seat support to form the valve seat assembly, the valve seat assembly is integrally arranged in the valve cavity, after the valve seat is damaged, the valve seat assembly can be directly and integrally taken down, the valve can be normally used after being replaced with a new valve seat assembly, the valve does not need to be scrapped, and manufacturing cost is greatly saved.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a diaphragm valve with a replaceable valve seat structure. Background Technology

[0002] Diaphragm valves are widely used in the semiconductor manufacturing industry. Currently, most diaphragm valves use non-metallic valve seats, which are directly embedded at the end of the valve body's inlet flow channel. When the medium contains solid particles, the valve seat surface is easily worn or scratched. Furthermore, non-metallic valve seats are prone to material aging when exposed to high temperatures or corrosive media for extended periods, ultimately affecting the diaphragm valve's sealing performance and rendering the entire valve unusable, resulting in significant waste. Therefore, a diaphragm valve with a replaceable valve seat structure is needed to improve this situation. Utility Model Content

[0003] The purpose of this utility model is to provide a diaphragm valve with a replaceable valve seat structure, which solves the technical problem mentioned in the background art that the existing diaphragm valve cannot replace the non-metallic valve seat, and once the non-metallic valve seat wears and ages, it affects the sealing performance of the diaphragm valve, causing the entire valve to be scrapped.

[0004] To achieve the above objectives, this utility model provides a diaphragm valve with a replaceable valve seat structure, including a valve body, a valve seat assembly, a diaphragm, and an actuator. The valve body has a valve cavity that connects an inlet and an outlet. The valve seat assembly is detachably disposed in the valve cavity. The diaphragm is disposed on the valve seat assembly. The actuator is disposed on the diaphragm and axially forces the diaphragm to be close to or away from the valve seat assembly. When the diaphragm is close to the valve seat assembly, the valve is in a closed state. When the diaphragm is away from the valve seat assembly, the valve is in an open state.

[0005] Furthermore, the valve seat assembly includes a valve seat bracket and a valve seat, the valve seat being symmetrically pressed against the upper and lower end faces of the valve seat bracket.

[0006] Furthermore, the valve seat bracket has a groove in the middle and an arc surface on its outer edge.

[0007] Compared with the prior art, the beneficial effect of this utility model is that by pressing the valve seat onto the upper and lower end faces of the valve seat bracket to form a valve seat assembly, and the valve seat assembly is set in the valve cavity as a whole, when the valve seat is damaged, the valve seat assembly can be directly removed as a whole and replaced with a new valve seat assembly for normal use, without the need to scrap the valve, which greatly saves manufacturing costs. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the overall structure of the diaphragm valve of this utility model;

[0009] Figure 2This is a schematic diagram of the valve body of this utility model;

[0010] Figure 3 This is a schematic diagram of the overall structure of the valve seat assembly of this utility model;

[0011] Figure 4 for Figure 3 A cross-sectional view along the AA direction;

[0012] In the diagram, 10 is the valve body; 11 is the inlet; 12 is the valve seat assembly; 13 is the outlet; 14 is the diaphragm; 15 is the inlet flow channel; 16 is the valve cap nut; 17 is the outlet flow channel; 18 is the actuator; 19 is the boss; 20 is the valve cavity; 21 is the shoulder; 22 is the valve seat bracket; 24 is the valve seat; 26 is the arc surface; and 28 is the groove. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0014] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0015] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0016] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0017] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0018] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] The following describes some embodiments of the present invention in detail with reference to the accompanying drawings.

[0020] See appendix for details Figures 1-2 As shown, the diaphragm valve with a replaceable valve seat structure according to this utility model includes a valve body 10, a valve seat assembly 12, a diaphragm 14, and an actuator 18. The valve body 10 has an upward-opening valve cavity 20, which connects an inlet 11 and an outlet 13. The valve seat assembly 12 is disposed on a shoulder 21 in the valve cavity 20, and the valve seat assembly 12 is annular, having an upper end face and a lower end face. The diaphragm 14 is disposed at the upper end of the valve seat assembly 12, and the edge of the diaphragm 14 contacts the upper outer edge of the valve seat assembly 12. The actuator 18 is vertically disposed on the diaphragm 14, and a valve cap nut 16 is threadedly connected to the upper end of the valve body 10, which fixes the actuator 18 to the valve body 10. The actuator 18 includes, but is not limited to, components such as a valve cap, button, valve stem, and handle, and can be manually driven, pneumatically driven, or electrically driven. The actuator 18 presses the edge of the diaphragm 14 against the upper outer edge of the valve seat assembly 12, while the lower outer edge of the valve seat assembly 12 presses against the shoulder 21 of the valve body 10 to form a tight seal and prevent external leakage. When the actuator 18 applies force to the diaphragm 14, the middle part of the diaphragm 14 moves towards the valve seat assembly 12 until it fits against the valve seat assembly 12 to form a surface seal, at which point the valve is in the closed state. Conversely, when the middle part of the diaphragm 14 moves away from the valve seat assembly 12, the inlet flow channel 15 and the outlet flow channel 17 are connected, and the valve is in the open state.

[0021] The outer diameter of the valve seat assembly 12 is smaller than the inner diameter of the valve cavity 20, therefore, the valve seat assembly 12 can be easily removed from the valve cavity 20. When the valve seat assembly 12 is damaged, loosen the valve cap nut 16, remove the actuator 18 as a whole, and remove the diaphragm 14 to remove and replace the entire valve seat assembly. After replacing the valve seat assembly, reassemble the valve for use.

[0022] Specifically, the valve seat assembly 12 includes a valve seat support 22 and a valve seat 24, see Appendix Figure 3 and 4 The valve seat support 22 is symmetrically shaped like a wheel, with a groove 28 in the middle. The valve seat 24 is disposed within the groove 28, and the edges of the groove 28 are tightened to grip the valve seat 24 using a clamping technique. Through holes are distributed on the outer ring of the valve seat 24. When the valve seat assembly 12 is disposed in the valve cavity 20, the lower outer edge of the valve seat support 12 abuts against the shoulder 21 of the valve body 10. The lower valve seat, clamped by the lower end face of the valve seat support 12, abuts against the boss 19 at the end of the inlet flow channel 15, while the upper valve seat, clamped by the upper end face, selectively fits or separates from the diaphragm 14. Preferably, the upper and lower outer edges of the valve seat support 22 are provided with arc surfaces 26. The arc surfaces 26 facilitate a tighter seal between the valve seat assembly 12 and the diaphragm 14, as well as between the valve seat assembly 12 and the shoulder 21 of the valve body 10, fully ensuring the valve's external leakage performance.

[0023] In this invention, the valve body 10 is made of cold-drawn 316L material, and the valve seat bracket 22 is made of annealed 316L material, ensuring a certain hardness difference between the two. The diaphragm 14 is made of cobalt alloy, and the valve seat 24 can be made of plastics such as PFA or VESPEL, with PCTFE being preferred due to its good chemical compatibility. The valve seat assembly 12 has a completely symmetrical structure, providing foolproof protection, allowing installation from any end face, greatly facilitating user assembly, replacement, and maintenance.

[0024] The basic principles and advantages of this utility model have been described above. For those skilled in the art, the above embodiments are merely illustrative of the technical solutions of this utility model and not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some or all of the technical features by reading this specification. Any obvious substitutions are within the protection scope of this utility model without departing from its concept.

Claims

1. A diaphragm valve of the replaceable valve seat structure type, characterized in that, The valve comprises a valve body (10), a valve seat assembly (12), a diaphragm (14) and an actuator (18), the valve body (10) has a valve cavity (20) through which an inlet and an outlet pass, the valve seat assembly (12) is detachably arranged in the valve cavity (20), the diaphragm (14) is arranged on the valve seat assembly (12), the actuator (18) is arranged on the diaphragm (14) and axially forces the diaphragm (14) to abut or move away from the valve seat assembly (12), when the diaphragm (14) abuts the valve seat assembly (12), the valve is in a closed state, and when the diaphragm (14) moves away from the valve seat assembly, the valve is in an open state.

2. A diaphragm valve of the replaceable seat structure according to claim 1, characterized in that, The valve seat assembly (12) comprises a valve seat support (22) and a valve seat (24), and the valve seat (24) is symmetrically buckled on the upper and lower end faces of the valve seat support (22).

3. A diaphragm valve of the replaceable seat type according to claim 2, characterized in that The valve seat support (22) is provided with a groove (28) in the middle and a circular arc surface (26) on the outer edge.

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