Multi-sealing structure of regulating valve for hydrogen

Abstract

The utility model relates to the technical field of regulating valves, in particular to a multi-sealing structure of a regulating valve for hydrogen, which comprises a valve body, a valve rod, a valve cover, a valve plug and the like. A groove is formed in the valve seat, a valve pad is arranged in the groove, and the valve pad is tightly pressed through a sleeve; hard alloy is overlaid on the sealing face of the valve plug and the valve port, and hard alloy is overlaid on the sealing face of the valve seat and the valve port. A valve seat is arranged in a valve body, a sleeve is located between a valve plug and the valve body, the valve seat is in contact with the bottom of the sleeve, a valve pad is installed in a groove of the valve seat and pressed by the sleeve to form sealing, a medium flows out of the valve body through a flowing channel via a valve port, and hard alloy is further overlaid on the sealing face of the valve plug and the valve seat. The abrasion resistance and corrosion resistance of the valve port sealing surface are improved through hard alloy surfacing, and the service life of the valve is prolonged; the valve pad is tightly pressed by the sleeve, and the exposed part is reduced, so that the scouring and abrasion of the medium to the valve pad are reduced, and the overall sealing effect of the valve is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of regulating valves, in particular to a multiple sealing structure of a regulating valve for hydrogen. Background Art

[0002] Regulating valves, also known as control valves, automatically adjust their opening based on received control signals to control key process parameters such as flow, temperature, and pressure of the flowing medium, achieving automatic control. With the promotion of hydrogen energy and the expansion of related hydrogen production and refueling facilities, the demand for valves in hydrogen systems is increasing. However, valves used in hydrogen systems require extremely high sealing performance and must achieve zero leakage. The sealing systems of hydrogen regulating valves currently on the market still have insufficient performance.

[0003] In order to solve the above problems, a multi-sealing structure of a hydrogen regulating valve is designed.

[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] The utility model provides a multi-sealing structure of a hydrogen regulating valve, thereby effectively solving the problems in the background technology.

[0006] In order to achieve the above-mentioned object, the technical solution adopted by the present invention is: a multi-sealing structure of a hydrogen regulating valve, comprising: a valve body, a valve stem, a valve cover and a valve plug, wherein the valve cover is arranged on the top of the valve body; the valve stem passes through the valve cover, one end of which extends into the interior of the valve body and the other end extends to the outside; the valve plug is arranged inside the valve body and fixedly connected to one end of the valve stem;

[0007] A sleeve is provided inside the valve body, the sleeve is provided between the valve plug and the valve body, a valve seat is fixedly provided inside the valve body, and the valve seat contacts the bottom of the sleeve;

[0008] Wherein, a flow channel is provided inside the valve body, and the flow channel extends to the outside to form a plurality of valve ports;

[0009] The valve seat is provided with a groove, a valve pad is provided in the groove, and the valve pad is pressed by the sleeve;

[0010] The sealing surfaces of the valve plug and the valve port are built-up with hard alloy, and the sealing surfaces of the valve seat and the valve port are built-up with hard alloy.

[0011] Furthermore, a metal wound gasket is provided between the valve body and the valve seat.

[0012] Furthermore, the sealing surface of the valve pad is configured to be in an arc shape, and the sealing surface of the valve plug is configured to be in a conical surface.

[0013] Furthermore, the valve plug is provided with a plurality of mounting grooves, and a plurality of O-rings are provided in the mounting grooves.

[0014] Furthermore, metal spiral wound washers are provided on the upper and lower contact surfaces of the valve body and the sleeve.

[0015] Furthermore, a packing assembly is provided on the top of the valve cover. The upper part of the packing assembly is polytetrafluoroethylene packing, and the lower part is graphite packing. The middle is separated by a spacer ring, and one end extends to the inside of the valve cover to wrap the valve stem to achieve multi-stage sealing.

[0016] Furthermore, a packing gland is provided above the packing assembly, and the packing gland is used to compress the packing assembly;

[0017] The packing gland is provided with a disc spring, which is compressed by a nut and releases elastic force to press down the packing assembly.

[0018] Furthermore, a combined dust ring and the O-ring are provided on the packing valve cover, the combined dust ring is in contact with the valve stem body, and the O-ring is in contact with the valve cover.

[0019] The beneficial effects of the present invention are as follows: the valve stem extends from the exterior of the valve body to the interior through the valve cover and is tightly connected to the valve plug. The valve plug is located within the valve body and moves accordingly with the movement of the valve stem to control the flow direction of the fluid. A valve seat is fixed within the valve body. A sleeve is located between the valve plug and the valve body. The bottom of the valve seat contacts the sleeve, forming a sealed environment. The flow channel allows the medium to flow out of the valve body through the valve port. A valve gasket is installed in the groove of the valve seat and is compressed by the sleeve. The sealing surfaces of the valve plug and valve seat are also welded with hard alloy. The hard alloy overlay improves the wear and corrosion resistance of the valve port sealing surface, extending the service life of the valve. The valve gasket is compressed by the sleeve, reducing its exposed portion, thereby reducing erosion and wear of the gasket by the medium and enhancing the overall sealing effect of the valve. In the event of valve port gasket failure, the valve plug contacts the hard alloy overlay welded at the valve port of the valve seat to form a double seal configuration, ensuring that the valve continues to maintain good sealing performance, greatly improving the reliability and maintenance efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic diagram of the multi-seal structure of a hydrogen regulating valve;

[0022] Figure 2 Schematic diagram of the valve seat position structure;

[0023] Figure numerals: 1. Valve body; 11. Sleeve; 12. Valve seat; 12A. Groove; 12B. Valve gasket; 13. Flow channel; 14. Valve port; 2. Valve stem; 3. Valve cover; 31. Packing assembly; 31A. Spacer ring; 32. Packing gland; 32A. Disc spring; 32B. Nut; 32C. Combined dust ring; 4. Valve plug; 41. Mounting groove; 42. O-ring; 5. Metal wound gasket. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside” are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; they may refer to mechanical or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0027] like Figures 1 to 2As shown, a multi-sealing structure of a hydrogen regulating valve includes: a valve body 1, a valve stem 2, a valve cover 3 and a valve plug 4. The valve cover 3 is arranged on the top of the valve body 1; the valve stem 2 passes through the valve cover 3, one end of which extends into the interior of the valve body 1 and the other end extends to the outside; the valve plug 4 is arranged inside the valve body 1 and fixedly connected to one end of the valve stem 2;

[0028] A sleeve 11 is provided inside the valve body 1. The sleeve 11 is provided between the valve plug 4 and the valve body 1. A valve seat 12 is fixedly provided inside the valve body 1. The valve seat 12 contacts the bottom of the sleeve 11.

[0029] The valve body 1 is provided with a flow channel 13 inside, and the flow channel 13 extends to the outside to form a plurality of valve ports 14;

[0030] The valve seat 12 is provided with a groove 12A, a valve pad 12B is provided in the groove 12A, and the valve pad 12B is pressed by the sleeve 11;

[0031] The sealing surface between the valve plug 4 and the valve port 14 is built-up with hard alloy, and the sealing surface between the valve seat 12 and the valve port 14 is built-up with hard alloy.

[0032] The valve stem 2 extends from the outside of the valve body 1 to the inside through the valve cover 3 and is tightly connected to the valve plug 4. The valve plug 4 is located inside the valve body 1 and moves accordingly with the movement of the valve stem 2 to control the flow direction of the fluid. A valve seat 12 is fixed inside the valve body 1. A sleeve 11 is located between the valve plug 4 and the valve body 1. The bottom of the valve seat 12 contacts the sleeve 11, forming a sealed environment. The flow channel 13 allows the medium to flow out of the valve body 1 through the valve port 14. The groove 12A of the valve seat 12 is equipped with a valve gasket 12B, which is compressed by the sleeve 11. The sealing surfaces of the valve plug 4 and the valve seat 12 are also welded with hard alloy. The hard alloy overlay improves the wear and corrosion resistance of the sealing surface of the valve port 14, extending the service life of the valve. The valve gasket 12B is compressed by the sleeve 11, reducing its exposed portion, thereby reducing the erosion and wear of the valve gasket 12B by the medium and enhancing the overall sealing effect of the valve. When the gasket seal of the valve port 14 fails, the valve plug 4 contacts the hard alloy welded at the valve port of the valve seat 12 to form a double sealing configuration, ensuring that the valve continues to maintain good sealing performance, greatly improving the reliability and maintenance efficiency of the system.

[0033] In this embodiment, a metal spiral wound gasket 5 is provided between the valve body 1 and the valve seat 12 .

[0034] The metal spiral wound gasket 5 can effectively fill the tiny gaps between the joint surfaces through the characteristics of its material and design, thereby preventing fluid leakage, thereby ensuring that the valve can maintain good sealing performance under various operating conditions, extending the service life of the valve and maintaining the overall efficiency and safety of the system.

[0035] In this embodiment, the sealing surface of the valve pad 12B is configured to be an arc shape, and the sealing surface of the valve plug 4 is configured to be a conical surface.

[0036] The sealing surface of the valve gasket 12B adopts an arc-shaped design, and the sealing surface of the valve plug 4 is a conical surface, so that the sealing surface of the valve gasket 12B can effectively avoid the deposition of the medium and maintain the integrity and tightness of the seal; the arc-shaped sealing surface helps to disperse the pressure of the medium and reduce the sealing failure caused by medium accumulation; at the same time, the conical surface design of the valve plug 4 increases its resistance to airflow erosion, reduces the decline in sealing performance due to wear, and overall improves the reliability and maintenance cycle of the valve, ensuring efficient sealing during long-term operation.

[0037] In this embodiment, a plurality of mounting grooves 41 are provided on the valve plug 4 , and a plurality of O-rings 42 are provided in the mounting grooves 41 .

[0038] Several mounting grooves 41 are provided on the valve plug 4, and several O-rings 42 are installed in each groove to enhance the sealing effect between the valve plug 4 and the sleeve 11, and effectively prevent the gas from leaking through the sliding gap between the two. The use of O-rings 42 improves the overall sealing performance, reduces the potential risk of leakage, and thus enhances the safety and reliability of the system.

[0039] In this embodiment, metal spiral wound washers 5 are provided on the upper and lower contact surfaces of the valve body 1 and the sleeve 11 .

[0040] A metal spiral wound gasket 5 is provided between the middle flange surface of the valve body 1 and the upper and lower mounting surfaces of the sleeve 11. The metal spiral wound gasket 5 creates an enhanced sealing barrier on the contact surface between the valve body 1 and the sleeve 11, effectively preventing gas from leaking through these joints. The use of the metal spiral wound gasket 5 improves the overall sealing performance of the valve, ensures that the gas in the system does not escape, thereby maintaining the safety of the operating environment and the stability of the system.

[0041] In this embodiment, a packing assembly 31 is provided on the top of the valve cover 3. The upper part of the packing assembly 31 is a polytetrafluoroethylene packing, and the lower part is a graphite packing. The middle is separated by a spacer ring 31A. One end extends to the inside of the valve cover 3 to wrap the valve stem 2 to achieve multi-stage sealing.

[0042] A packing assembly 31 is mounted on top of the valve cover 3. This assembly consists of an upper PTFE packing and a lower graphite packing, separated by a spacer ring 31A. This multi-stage sealing design enables the valve cover 3 to provide an extremely effective seal when enclosing the valve stem 2. The combination of PTFE and graphite packing optimizes the sealing performance of the packing assembly 31, effectively preventing any possible media leakage. This not only improves the overall safety and reliability of the system, but also ensures the valve's sealing effectiveness over long periods of operation and under varying operating conditions, thereby reducing maintenance frequency and improving operational efficiency.

[0043] In this embodiment, a packing gland 32 is provided above the packing assembly 31 , and the packing gland 32 is used to compress the packing assembly 31 ;

[0044] A disc spring 32A is provided on the packing gland 32 . The disc spring 32A is compressed by a nut 32B and releases its elastic force to press down the packing assembly 31 .

[0045] The packing assembly 31 is compressed by a packing gland 32, ensuring the packing's stability. To further enhance the sealing effect and prevent potential leakage, disc springs 32A are mounted on the packing gland 32, which are compressed by nuts 32B. The use of disc springs 32A not only provides continuous downward pressure on the packing but also automatically compensates for loosening caused by wear, further helping to extend the packing's service life.

[0046] In this embodiment, a combined dust ring 32C is provided on the packing valve cover 3 , and the combined dust ring 32C is in contact with the body of the valve stem 2 .

[0047] The packing gland 32 is equipped with a combined dust ring 32C, which is in direct contact with the body of the valve stem 2. This effectively prevents external dust, dirt, or sand from entering the sealing area with the movement of the valve stem 2, reducing the wear of these impurities on the packing and the sealing parts of the valve stem 2. The use of the combined dust ring 32C not only protects the valve stem 2 from scratches, but also enhances the sealing effect of the packing gland 32, thereby significantly improving the overall service life and reliability of the valve. The packing gland 32 is also equipped with an O-ring, which contacts and seals the valve cover, forming a double sealing protection effect with the packing seal.

[0048] Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and the specification are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-sealing structure for a hydrogen regulating valve, characterized in that: include: A valve body, a valve stem, a valve cover and a valve plug, wherein the valve cover is arranged on the top of the valve body; the valve stem passes through the valve cover, one end of which extends into the interior of the valve body and the other end extends to the outside; the valve plug is arranged inside the valve body and fixedly connected to one end of the valve stem; A sleeve is provided inside the valve body, the sleeve is provided between the valve plug and the valve body, a valve seat is fixedly provided inside the valve body, and the valve seat contacts the bottom of the sleeve; Wherein, a flow channel is provided inside the valve body, and the flow channel extends to the outside to form a plurality of valve ports; The valve seat is provided with a groove, a valve pad is provided in the groove, and the valve pad is pressed by the sleeve; The sealing surfaces of the valve plug and the valve port are built-up with hard alloy, and the sealing surfaces of the valve seat and the valve port are built-up with hard alloy.

2. The multi-seal structure of the hydrogen regulating valve according to claim 1, characterized in that: A metal spiral wound gasket is provided between the valve body and the valve seat.

3. The multi-seal structure of the hydrogen regulating valve according to claim 1, characterized in that: The sealing surface of the valve pad is configured to be in an arc shape, and the sealing surface of the valve plug is configured to be in a conical shape.

4. The multi-seal structure of the hydrogen regulating valve according to claim 3, characterized in that: The valve plug is provided with a plurality of mounting grooves, and a plurality of O-rings are provided in the mounting grooves.

5. The multi-seal structure of the hydrogen regulating valve according to claim 1, characterized in that: Metal spiral wound washers are provided on the upper and lower contact surfaces of the valve body and the sleeve.

6. The multi-seal structure of the hydrogen regulating valve according to claim 1, characterized in that: A packing assembly is provided on the top of the valve cover. The upper part of the packing assembly is polytetrafluoroethylene packing, and the lower part is graphite packing. The middle is separated by a spacer ring. One end extends to the inside of the valve cover to wrap the valve stem to achieve multi-stage sealing.

7. The multi-seal structure of the hydrogen regulating valve according to claim 6, characterized in that: A packing gland is provided above the packing assembly, and the packing gland is used to compress the packing assembly; The packing gland is provided with a disc spring, which is compressed by a nut and releases elastic force to press down the packing assembly.

8. The multi-seal structure of the hydrogen regulating valve according to claim 7, characterized in that: The packing valve cover is provided with a combined dust ring and an O-shaped sealing ring. The combined dust ring contacts the valve stem body, and the O-shaped sealing ring contacts the valve cover.

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