All-metal hard-seal check valve

Abstract

The utility model relates to valve technical field, and disclose a kind of full metal hard sealing check valve, including valve body, valve seat, valve core, the flange for being used to connect with equipment is fixedly installed in the both ends of valve body, the inner and outer sealing ring and groove on valve seat are removed, the inner and outer surface of valve seat and valve core is sprayed corrosion-resistant alloy or hardfacing hard alloy, the roughness of valve seat and valve core sealing surface and form tolerance are improved, to realize the sealing between valve seat and valve core without through sealing ring sealing.Including valve seat support sleeve, spring, disc spring, valve seat support sleeve is set in valve body, spring and disc spring are set in valve seat support sleeve, spring and disc spring are used to provide elastic force, so that valve seat and valve core form initial seal when left side pressure is too low or no pressure.The full metal hard sealing check valve can work under superhigh pressure frequently, reduce the frequency of valve replacement sealing ring, improve its working life, reduce cost, simple structure.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to an all-metal hard-seal check valve. Background Technology

[0002] Currently, the known structure of a check valve consists of a valve body, valve seat, valve core, valve seat support sleeve, spring, valve cover sealing ring, inner sealing ring, outer sealing ring, disc spring, valve cover, nut, and bolts. When the valve body flange is connected to an ultra-high pressure source, the pressure from the ultra-high pressure source actuates the inner and outer sealing rings, causing the valve core and valve seat to form a seal. However, many soft-seal check valves are prone to deformation of the inner and outer sealing rings after frequent ultra-high pressure operation, thus reducing the overall sealing effect and affecting the normal use of the equipment.

[0003] To address this issue, we propose an all-metal hard-seal check valve. Utility Model Content

[0004] The purpose of this invention is to provide an all-metal hard-seal check valve, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an all-metal hard-seal check valve, comprising a valve body, a valve seat, and a valve core. Flanges for connecting to equipment are fixedly installed at both ends of the valve body. The valve seat has its inner and outer sealing rings and grooves removed. The inner and outer surfaces of the valve seat and the valve core are coated with corrosion-resistant alloy or hard alloy is welded. The roughness and dimensional tolerance of the sealing surfaces of the valve seat and the valve core are improved to achieve a seal between the valve seat and the valve core without the use of sealing rings.

[0006] Preferably, the valve seat also includes a valve seat support sleeve, a spring, and a disc spring. The valve seat support sleeve is disposed in the valve body, and the spring and disc spring are disposed inside the valve seat support sleeve. The spring and disc spring are used to provide elastic force so that the valve seat and valve core form an initial seal when the pressure on the left side is too low or there is no pressure.

[0007] Preferably, the corrosion-resistant alloy is a tungsten carbide coating or other alloy materials with high corrosion resistance.

[0008] Preferably, the dimensional and positional tolerances of the valve seat and the valve core sealing surfaces are not greater than 0.mm, and the surface roughness Ra value is not greater than 0.8μm.

[0009] Preferably, the valve body also includes a valve cover, a nut, and a bolt, and the valve body and the valve cover are assembled and connected by the nut and the bolt. A valve cover sealing ring is provided between the valve cover and the valve body.

[0010] Preferably, the working pressure of the check valve is no more than 0.5-0.6 times the rated working pressure.

[0011] This invention provides an all-metal hard-seal check valve. This all-metal hard-seal check valve has the following advantages:

[0012] This all-metal hard-seal check valve can operate frequently under ultra-high pressure, reducing the frequency of valve seal replacement, increasing its service life, reducing costs, and featuring a simple structure. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the flow direction structure of an all-metal hard-seal check valve during operation according to this utility model;

[0014] Figure 2 This is a cross-sectional view of an all-metal hard-seal check valve according to the present invention.

[0015] Figure 3 This utility model relates to an all-metal hard-seal check valve. Figure 2 A cross-sectional structural diagram.

[0016] In the diagram: 1. Valve body; 2. Valve seat; 3. Valve core; 4. Valve seat support sleeve; 5. Spring; 6. Valve cover sealing ring; 7. Disc spring; 8. Valve cover; 9. Nut; 10. Bolt. Detailed Implementation

[0017] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0018] like Figure 1-3 As shown, this utility model provides a technical solution: an all-metal hard-seal check valve, including a valve body 1, a valve seat 2, and a valve core 3. Flanges for connecting to equipment are fixedly installed at both ends of the valve body 1. The valve seat 2 has its inner and outer sealing rings and grooves removed. The inner and outer surfaces of the valve seat 2 and the valve core 3 are sprayed with corrosion-resistant alloy or overlaid with hard alloy. The corrosion-resistant alloy is a tungsten carbide coating or other alloy materials with high corrosion resistance. The roughness and dimensional tolerance of the sealing surfaces of the valve seat 2 and the valve core 3 are improved so as to achieve sealing between the valve seat 2 and the valve core 3 without the sealing ring. The dimensional tolerance of the sealing surfaces of the valve seat 2 and the valve core 3 is not greater than 0.01 mm, and the surface roughness Ra value is not greater than 0.8 μm.

[0019] It also includes a valve seat support sleeve 4, a spring 5, and a disc spring 7. The valve seat support sleeve 4 is disposed inside the valve body 1. The spring 5 and the disc spring 7 are disposed inside the valve seat support sleeve 4. The spring 5 and the disc spring 7 are used to provide elastic force so that the valve seat 2 and the valve core 3 form an initial seal when the pressure on the left side is too low or there is no pressure.

[0020] It also includes a valve cover 8, a nut 9, and a bolt 10. The valve body 1 and the valve cover 8 are assembled and connected by the nut 9 and the bolt 10. A valve cover sealing ring 6 is provided between the valve cover 8 and the valve body 1.

[0021] When using this all-metal hard-seal check valve:

[0022] I. Sealing Principle

[0023] Sealing structure without sealing rings: The inner and outer sealing rings and grooves on the valve seat 2 are removed. The valve seat 2 and valve core 3 are coated with corrosion-resistant alloy such as tungsten carbide coating or hard alloy overlay by spraying corrosion-resistant alloy. At the same time, the roughness and dimensional tolerance of the sealing surface are improved. The dimensional tolerance is no greater than 0.01mm and the surface roughness Ra value is no greater than 0.8μm. The valve seat and valve core are directly attached to achieve sealing without relying on traditional sealing rings.

[0024] Initial seal formation: When the pressure on the left side is too low or there is no pressure, under the elastic force provided by the spring 5 and the disc spring 7, the valve seat 2 and the valve core 3 come into close contact, forming an initial seal and preventing fluid or pressure on the right side from flowing to the left.

[0025] II. Work Process

[0026] High-pressure fluid action: High-pressure fluid according to Figure 1 The fluid flows into valve body 1 in the direction of the arrow. When high pressure is applied to the left side, the high-pressure fluid pushes the valve core 3 to open, and the fluid flows normally.

[0027] Pressure balancing and shut-off: When the pressure on the left side decreases or disappears, the elastic force of spring 5 and disc spring 7 pushes valve core 3 to reset, so that valve seat 2 and valve core 3 fit tightly again, and seal is achieved by using the high-precision fit of the sealing surfaces, and the valve is closed.

[0028] III. Role of Key Components

[0029] Valve seat support sleeve 4: Located inside the valve body 1, it supports and positions the valve seat 2, ensuring the relative positional accuracy between the valve seat and the valve core, and ensuring the sealing effect.

[0030] Spring 5 and disc spring 7: provide elastic restoring force, push valve core 3 to actuate when pressure changes, realize the opening and closing of the valve, and maintain the initial seal under no pressure or low pressure conditions.

[0031] Valve cover 8, nut 9, bolt 10: These assemble and connect the valve body 1 and valve cover 8 to form a complete valve structure. The valve cover sealing ring 6 ensures the seal between the valve cover and the valve body to prevent fluid leakage.

[0032] The above description is merely an illustrative embodiment of this utility model and is not intended to limit the scope of this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model. Furthermore, it should be noted that the components of this utility model are not limited to the overall application described above. Each technical feature described in the specification of this utility model can be used individually or in combination as needed. Therefore, this utility model naturally covers other combinations and specific applications related to the points of this utility model.

Claims

1. An all-metal hard-seal check valve, comprising a valve body (1), a valve seat (2), and a valve core (3), characterized in that: The valve body (1) is fixedly installed with flanges for connecting to the equipment at both ends. The valve seat (2) has its inner and outer sealing rings and grooves removed. The inner and outer surfaces of the valve seat (2) and valve core (3) are sprayed with corrosion-resistant alloy or hard alloy is welded. The roughness and dimensional tolerance of the sealing surfaces of the valve seat (2) and valve core (3) are improved so as to achieve sealing between the valve seat (2) and valve core (3) without sealing rings.

2. The all-metal hard-seal check valve according to claim 1, characterized in that: It also includes a valve seat support sleeve (4), a spring (5), and a disc spring (7). The valve seat support sleeve (4) is disposed inside the valve body (1). The spring (5) and the disc spring (7) are disposed inside the valve seat support sleeve (4). The spring (5) and the disc spring (7) are used to provide elastic force so that the valve seat (2) and the valve core (3) form an initial seal when the pressure on the left side is too low or there is no pressure.

3. The all-metal hard-seal check valve according to claim 1, characterized in that: The corrosion-resistant alloy is a tungsten carbide coating or other alloy materials with high corrosion resistance.

4. The all-metal hard-seal check valve according to claim 1, characterized in that: The dimensional tolerance of the sealing surfaces of the valve seat (2) and the valve core (3) is no greater than 0.01 mm, and the surface roughness Ra value is no greater than 0.8 μm.

5. The all-metal hard-seal check valve according to claim 1, characterized in that: It also includes a valve cover (8), a nut (9), and a bolt (10). The valve body (1) and the valve cover (8) are assembled and connected by the nut (9) and the bolt (10). A valve cover sealing ring (6) is provided between the valve cover (8) and the valve body (1).

6. The all-metal hard-seal check valve according to claim 1, characterized in that: The working pressure of the check valve shall not exceed 0.5-0.6 times the rated working pressure.

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