High-coaxiality large-diameter pilot low-leakage single-seat valve

Abstract

This utility model proposes a high coaxiality, large-diameter guided, low-leakage single-seat valve, relating to the field of valve technology. It includes a valve seat sealing surface, a valve cage guide, a valve core sealing surface, a valve core guide, and a pressure cage. The valve core sealing surface and valve core guide are an integral structure, as are the valve seat sealing surface and valve cage guide, eliminating the misalignment defects caused by machining errors in separate structures. The diameter of the valve core guide is larger than the diameter of the valve core sealing surface and moves up and down along the valve cage guide. A flow channel groove is provided between the valve seat sealing surface and the valve cage guide. The integrated structure of the valve seat and guide improves assembly accuracy. An enlarged guide is designed on the valve seat to improve coaxiality and reduce leakage, helping to ensure product quality and assembly efficiency. Small holes are drilled in the pressure cage to prevent the medium from directly eroding the packing.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a high coaxiality, large-diameter guided, low-leakage single-seat valve. Background Technology

[0002] The high coaxiality, large-diameter guided, low-leakage single-seat valve is a common type of regulating valve. It typically consists of a valve body, valve core, valve seat, valve stem, and drive device. It controls fluid parameters such as flow rate and pressure by relying on the cooperation between the valve core and valve seat. It features simple structure, low leakage, and good shut-off performance, and is widely used in automated control systems in chemical, petroleum, and power industries.

[0003] In Chinese Patent Publication No. CN221323294U, this utility model discloses a single-seat valve, in which the valve stem passes through the valve body and is rotatably connected to the valve body. The valve body is provided with a valve cavity, an inlet channel, and an outlet channel. A valve seat is provided in the valve cavity, wherein the two ends of the valve seat are rotatably connected to the side wall of the valve cavity. The valve stem and the valve seat are interference-fitted. This utility model replaces the original guide sleeve, valve seat pressure sleeve, and valve seat with an integrated valve seat, reducing the number of parts, thereby avoiding assembly differences between parts and solving the sealing problem between the valve seat and the valve body. At the same time, the integrated valve seat and valve stem are both castings, formed in one piece, and the valve stem and valve seat are processed in a single clamping.

[0004] In existing low-leakage single-seat valves, the valve seat and guide sleeve are separate structures. Due to machining and assembly errors, if the assemblers do not detect these errors in time, the valve stem may deviate from the center, resulting in increased leakage. Utility Model Content

[0005] The purpose of this invention is to provide a high coaxiality, large-diameter guided, low-leakage single-seat valve, which solves the problem of difficulty in timely detection when a single-seat valve is blocked.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high coaxiality, large diameter guided, low leakage single-seat valve, comprising a valve seat sealing surface, a valve cage guide, a valve core sealing surface, a valve core guide, and a pressure cage. The valve core sealing surface and the valve core guide are integral structures. The integral structure is used to eliminate the non-axial defects caused by the processing errors of the split structure. The valve core guide moves up and down along the valve cage guide.

[0007] Preferably, the valve seat sealing surface and the valve cage guide are an integral structure, and the diameter of the valve core guide is larger than the diameter of the valve core sealing surface.

[0008] Preferably, a flow channel groove is provided between the valve seat sealing surface and the valve cage guide. The flow channel groove is used to transport the medium to the downstream. The number of flow channel grooves is determined according to different working conditions.

[0009] Compared with the prior art, the beneficial effects of this utility model include: the integrated structure of valve seat and guide avoids the processing errors of separate valve seat and guide sleeve, improves assembly accuracy; the valve seat is designed with an enlarged guide with a guide diameter larger than the valve core diameter; since the valve seat seal and guide are an integral structure, the coaxiality is improved, the leakage is reduced, and it helps to ensure product quality and assembly efficiency; small holes are drilled on the pressure cage to prevent the medium from directly scouring the packing. Attached Figure Description

[0010] Figure 1 The schematic diagram shows a front view of a high coaxiality, large-diameter guided, low-leakage single-seat valve according to one embodiment of the present invention.

[0011] Figure 2 The diagram schematically shows an enlarged structural schematic of the valve cage guide portion according to one embodiment of the present invention;

[0012] Figure 3 The diagram schematically shows an enlarged structural schematic of the valve core guide portion according to one embodiment of the present invention.

[0013] The following are the labels in the diagram: 1. Valve seat sealing surface; 2. Valve cage guide; 3. Valve core sealing surface; 4. Valve core guide; 5. Pressure cage. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings.

[0016] Combination Figures 1 to 3 This utility model discloses a high coaxiality, large-diameter guided, low-leakage single-seat valve, comprising a valve seat sealing surface 1, a valve cage guide 2, a valve core sealing surface 3, a valve core guide 4, and a pressure cage 5. The valve core sealing surface 3 and the valve core guide 4 are integral structures, which are used to eliminate the non-axial defects caused by the processing errors of the split structure. The valve core guide 4 moves up and down along the valve cage guide 2. The valve seat sealing surface 1 and the valve cage guide 2 are integral structures. The diameter of the valve core guide 4 is larger than the diameter of the valve core sealing surface 3. A flow channel groove is provided between the valve seat sealing surface 1 and the valve cage guide 2. The flow channel groove is used to transport the medium to the downstream. The number of flow channel grooves is determined according to different working conditions.

[0017] In this embodiment, an integrated structure of valve seat and guide is provided, which can avoid the processing errors of separate valve seat and guide sleeve, and improve the assembly accuracy. The valve seat is designed with an enlarged guide, the guide diameter is larger than the valve core diameter. Since the valve seat seal and guide are an integral structure, the coaxiality is improved and the leakage is reduced, which helps to ensure product quality and assembly efficiency. Small holes are drilled on the pressure cage 5 to prevent the medium from directly scouring the packing.

[0018] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A high coaxiality, large-diameter guided, low-leakage single-seat valve, characterized in that: It includes a valve seat sealing surface (1), a valve cage guide (2), a valve core sealing surface (3), a valve core guide (4), and a pressure cage (5). The valve core sealing surface (3) and the valve core guide (4) are an integral structure. The integral structure is used to eliminate the defects of different axes caused by the processing error of the split structure. The valve core guide (4) moves up and down along the valve cage guide (2). The valve seat sealing surface (1) and the valve cage guide (2) are an integral structure. The diameter of the valve core guide (4) is larger than the diameter of the valve core sealing surface (3).

2. The high coaxiality, large-diameter guided, low-leakage single-seat valve according to claim 1, characterized in that; A flow channel groove is provided between the valve seat sealing surface (1) and the valve cage guide (2), and the flow channel groove is used to transport the medium to the downstream.

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