A combined valve body suitable for safe pressure relief operation of sampling cylinder

Abstract

The present invention relates to a combined valve body suitable for the safe pressure relief operation of a sampling cylinder, which comprises a stop valve part and a pressure relief valve part. The stop valve part comprises a stop valve body, a valve stem, a packing nut and a sealing unit. A valve stem installation chamber, a transition chamber, a medium discharge chamber and a medium inlet chamber are provided in the stop valve body. The sealing unit is filled in the valve stem installation chamber, and the circumferential sealing of the valve stem is achieved by the downward pressure of the packing nut. The transition chamber is formed by the bottom wall of the valve stem installation chamber extending downward, and penetrates the stop valve body. The medium discharge chamber and the medium inlet chamber are formed by the left and right side walls of the stop valve body extending inward, and are respectively connected with the transition chamber and the valve stem installation chamber in a one-to-one correspondence. The valve stem is inserted into the valve stem installation chamber, and the axial relative position thereof is adjusted to achieve the change of the on / off state of the valve stem installation chamber and the transition chamber. The pressure relief valve part is assembled as one with the stop valve part, and is directly connected with the transition chamber.

Description

Technical Field

[0001] The invention relates to the technical field of valve manufacturing, in particular to a combined valve body suitable for safe pressure relief operation of a sampling cylinder. Background Art

[0002] In traditional pipeline sampling, sampling cylinders are the most common method. This involves injecting fluid into a cylinder and then removing it via a shutoff valve. This method is widely used in industries such as petroleum refining, chemicals, papermaking, pharmaceuticals, water conservancy, electric power, and steel, and plays a vital role in the national economy. According to US DOT regulations and CGAS-1.1, compressed gas cylinders must be equipped with a pressure relief device, making proper filling of cylinders crucial to prevent overpressurization.

[0003] like Figure 1 As shown in , in order to ensure the safety of its use, the sampling cylinder must be used in conjunction with a pressure relief valve. In the prior art, the pressure relief valve is usually selected as a safety membrane pressure relief valve. When the pressure exceeds the pressure range of the safety membrane, it will rupture, and the medium (gas or fluid) will be discharged, which plays a role in pressure relief. Although the use of the safety membrane pressure relief valve has better ensured the safety of the sampling cylinder, the following problems still exist in the actual application process: 1) The safety membrane of the safety membrane pressure relief valve is a disposable product. After it is damaged, it needs to be replaced in time to prepare for the next pressure relief control. However, the disassembly and assembly of the safety membrane is extremely inconvenient, time-consuming and labor-intensive, and it is not easy to perform subsequent maintenance; 2) The response speed of the safety membrane pressure relief valve is slow, which causes the sampling cylinder to fail to relieve pressure in time, thereby causing safety risks;

[0004] 3) Once the safety disc ruptures, the medium in the sampling cylinder will continue to leak out until human intervention occurs, resulting in a large amount of medium waste in the sampling cylinder. Moreover, if the leaked medium is hot or toxic, it may even pose a safety hazard to the operator. Therefore, technical personnel are urgently needed to solve this problem. Summary of the Invention

[0005] Therefore, in view of the above-mentioned existing problems and defects, the designers of the present invention collected relevant information, conducted multiple evaluations and considerations, and continued to experiment and modify after many years of R&D experience by technicians engaged in this industry, which ultimately led to the emergence of a combined valve body suitable for safe pressure relief operations of sampling cylinders.

[0006] To address the above-mentioned technical problems, the present invention relates to a combined valve body suitable for safely relieving pressure from sampling cylinders. The valve body comprises a shutoff valve portion and a pressure relief valve portion. The shutoff valve portion includes a shutoff valve body, a valve stem, a packing nut, and a sealing unit. A stem mounting protrusion extends upward from the top wall of the shutoff valve body. A stem mounting cavity for inserting the valve stem is defined within the stem mounting protrusion and extends into the interior of the shutoff valve body. The sealing unit is filled within the stem mounting cavity and, under the downward pressure of the packing nut, circumferentially seals the valve stem. The packing nut is screwed onto the stem mounting protrusion to tighten the sealing unit. A transition chamber, a medium discharge chamber, and a medium inlet chamber are defined within the shutoff valve body. The transition chamber extends downward from the bottom wall of the stem mounting cavity and extends through the shutoff valve body. The medium discharge chamber and the medium inlet chamber extend inward from the left and right side walls of the shutoff valve body and communicate with the transition chamber and the stem mounting cavity, respectively. The valve stem is inserted into the valve stem mounting cavity, and the on / off state of the valve stem mounting cavity and the transition cavity can be changed by adjusting their axial relative position. The pressure relief valve portion and the stop valve portion are assembled as one body and are directly connected to the transition cavity.

[0007] As a further improvement to the technical solution of the present invention, the pressure relief valve unit includes a pressure relief valve body, a pressure relief spring, and a pressure relief valve core. The pressure relief valve body is detachably connected to the shut-off valve body. A valve core accommodating chamber and a flow relief chamber are defined within the pressure relief valve body. The valve core accommodating chamber is used to accommodate both the pressure relief spring and the pressure relief valve core and is directly connected to the transition chamber. The pressure relief valve core seals the lower end of the transition chamber using the elastic biasing force of the pressure relief spring. The flow relief chamber extends downward from the bottom wall of the valve core accommodating chamber and extends through the pressure relief valve body.

[0008] As a further improvement of the technical solution of the present invention, the pressure relief valve body is plugged into the stop valve body and a detachable connection is achieved by a threaded pair. Correspondingly, a plug-in installation cavity adapted to the pressure relief valve body extends upward from the bottom wall of the stop valve body.

[0009] As a further improvement to the technical solution of the present invention, the pressure relief valve portion further includes a rubber sealing ring. The rubber sealing ring is sleeved on the pressure relief valve body and is elastically pressed between the pressure relief valve body and the shut-off valve body when the pressure relief valve portion is fully mated with the shut-off valve portion.

[0010] As a further improvement of the technical solution of the present invention, the combined valve body suitable for the safe pressure relief operation of the sampling cylinder further includes a pipe joint. The pipe joint is detachably connected to the pressure relief valve body and directly communicates with the discharge chamber.

[0011] By adopting the above-mentioned technical solution, the pressure inside the sampling cylinder can be controlled by means of a combination of the shut-off valve part and the pressure relief valve part. When the pressure inside the sampling cylinder is lower than the rated standard value, the pressure relief valve part fails to open and is in a sealed state; when the pressure inside the sampling cylinder exceeds the standard value, the pressure relief valve part opens immediately, and the medium inside is discharged, thereby playing a role in pressure relief. In this way, on the one hand, the combined valve body integrates the shut-off function and the pressure relief function into one, and has a relatively compact design structure, which is conducive to the subsequent installation operation with the sampling cylinder; on the other hand, the pressure relief valve part has a relatively fast response speed, which not only helps to ensure that the sampling cylinder has a high application safety, but also minimizes the leakage of the sampling cylinder; on the other hand, the combined valve body has a relatively stable service life and can undergo multiple pressure relief cycles, thereby effectively reducing the subsequent maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] 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 of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0013] Figure 1 This is a diagram of the application status of a safety membrane pressure relief valve on a material taking cylinder in the prior art.

[0014] Figure 2 It is a three-dimensional schematic diagram of a combined valve body suitable for safe pressure relief operation of a sampling cylinder in the present invention.

[0015] Figure 3 yes Figure 2 Front view of .

[0016] Figure 4 yes Figure 2 side view.

[0017] Figure 5 yes Figure 4 AA cross-sectional view.

[0018] 1-Stop valve part; 11-Stop valve body; 111-Valve stem mounting boss; 1111-Valve stem mounting chamber; 112-Transition chamber; 113-Medium discharge chamber; 114-Medium inlet chamber; 115-Matching installation chamber; 12-Valve stem; 13-Packing nut; 14-Sealing unit; 2-Pressure relief valve part; 21-Pressure relief valve body; 211-Valve core accommodating chamber; 212-Discharge chamber; 22-Pressure relief spring; 23-Pressure relief valve core; 24-Rubber sealing ring; 3-Pipe joint. DETAILED DESCRIPTION

[0019] In the description of the present invention, it should be understood that the terms "left", "right", "up", "down", "front", "back", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0020] The technical solution disclosed in the present invention is further described in detail below with reference to specific embodiments. Figure 2 、 Figure 3 The figures show a perspective schematic diagram and a front view of a combined valve body suitable for safely releasing pressure from a sampling cylinder according to the present invention. It is understood that the combined valve body primarily comprises a shutoff valve portion 1 and a pressure relief valve portion 2. The shutoff valve portion 1 includes a shutoff valve body 11, a valve stem 12, a packing nut 13, and a sealing element 14. A stem mounting protrusion 111 extends upward from the top wall of the shutoff valve body 11. Within this protrusion 111 is a stem mounting cavity 1111 for inserting the valve stem, extending into the interior of the shutoff valve body 11. The sealing element 14 is positioned within this cavity, and the downward pressure of the packing nut 13 creates a circumferential seal against the valve stem 12. The packing nut 13 is screwed onto the stem mounting protrusion 111 to tighten the sealing element 14. Correspondingly, the outer wall of the stem mounting protrusion 111 is provided with external threads that mate with the packing nut 13. In addition, a transition chamber 112, a medium discharge chamber 113 and a medium inlet chamber 114 are provided in the stop valve body 11. The transition chamber 112 is formed by the bottom wall of the valve stem mounting chamber 1111 continuing to extend downward, and passes through the stop valve body 11. The medium discharge chamber 113 and the medium inlet chamber 114 are formed by the left and right side walls of the stop valve body 11 extending inward, and are respectively connected to the transition chamber 112 and the valve stem mounting chamber 1111 in a one-to-one correspondence. The valve stem 12 is inserted into the valve stem mounting chamber 1111, and the axial relative position thereof is adjusted to achieve the change of the on / off state of the valve stem mounting chamber 1111 and the transition chamber 112. The pressure relief valve portion 2 is assembled with the stop valve portion 1 as a whole, and is directly connected to the transition chamber 112 (such as Figure 4 、 5 ).

[0021] The working principle of the combined valve body suitable for the safe pressure relief operation of the sampling cylinder is roughly as follows: when the pressure in the inner cavity of the sampling cylinder is lower than the rated standard value, the pressure relief valve part 2 fails to open, so that the sampling cylinder remains in a sealed state to maintain the stability of the pressure in the external sampling tube; and when the pressure in the inner cavity of the sampling cylinder exceeds the standard value, the pressure relief valve part 2 opens immediately, and the medium in the sampling cylinder is discharged, thereby achieving the purpose of pressure relief.

[0022] By adopting the above technical solution, at least the following beneficial technical effects are achieved:

[0023] 1) The combined valve body integrates the shut-off function and the pressure relief function, and has a relatively compact design structure, which is conducive to the subsequent installation operation with the sampling cylinder;

[0024] 2) The pressure relief valve portion 2 has a relatively fast response speed, which not only helps to ensure that the sampling cylinder has a high application safety, but also reduces the leakage of the sampling cylinder as much as possible;

[0025] 3) The combined valve body has a relatively stable service life and can undergo multiple pressure relief cycles without the need for staff intervention and maintenance during the process, thereby effectively reducing subsequent maintenance costs.

[0026] As a further refinement of the above-mentioned combined valve body structure suitable for the safe pressure relief operation of the sampling cylinder, such as Figure 4 、 5 As shown in the figure, the pressure relief valve section 2 mainly consists of a pressure relief valve body 21, a pressure relief spring 22, and a pressure relief valve core 23. The pressure relief valve body 21 is detachable from the shut-off valve body 11 via a threaded pair. Extending upward from the bottom wall of the shut-off valve body 11 is a plug-in mounting cavity 115 that mates with the pressure relief valve body 21 and is directly connected to the transition chamber 112. External connecting threads are provided on the outer wall of the pressure relief valve body 21, and correspondingly, internal connecting threads that mate with the external connecting threads are provided on the sidewall of the plug-in mounting cavity 213. Within the pressure relief valve body 21 are a valve core accommodating cavity 211 and a discharge chamber 212. The valve core accommodating cavity 211 is used to accommodate both the pressure relief spring 22 and the pressure relief valve core 23 and is directly connected to the transition chamber 112. The pressure relief valve core 23 seals the lower end of the transition chamber 112 due to the elastic biasing force of the pressure relief spring 22. The discharge chamber 212 extends downward from the bottom wall of the valve core accommodating chamber and penetrates the pressure relief valve body 21 to achieve communication with the external environment. The insertion chamber 213 extends upward from the bottom wall of the stop valve body 11 to accommodate the pressure relief valve body 21. Through the design and application of the pressure relief spring 22 and the pressure relief valve core 23, when the pressure acting on the pressure relief valve core 23 from the sampling cylinder is less than the elastic force of the pressure relief spring 22, the pressure relief valve core 23 blocks the transition chamber 112, thereby blocking the transition chamber 112 and the discharge chamber 212, and maintaining the sampling cylinder in a sealed state. When the pressure acting on the pressure relief valve core 23 from the sampling cylinder is greater than the elastic force of the pressure relief spring 22, the pressure relief valve core 23 moves downward to release the blockage of the transition chamber 112, allowing the transition chamber 112 and the discharge chamber 212 to remain in a state of interconnection, and at this time, the pressure in the sampling cylinder is instantly reduced.

[0027] It should be noted here that in addition to the above-mentioned threaded connection method, the pressure relief valve part 2 can also adopt other methods to achieve a detachable connection with the stop valve part 1 according to different actual application scenarios, such as: snap-on type or interference fit type (not shown in the figure).

[0028] During the initial experimental stage of the combination valve suitable for the safe pressure relief operation of the sampling cylinder, it was found that it had the following problems: no matter whether the threaded connection method or the snap-on connection method is adopted, the contact area between the stop valve part 1 and the pressure relief valve part 2 is very prone to leakage, which is very likely to endanger the health of the operator when the medium is high temperature or toxic. In view of this, as a further optimization of the above-mentioned combination valve body structure suitable for the safe pressure relief operation of the sampling cylinder, the pressure relief valve part 2 is additionally provided with a rubber sealing ring 24. The rubber sealing ring 24 is provided on the pressure relief valve body 21, and when the pressure relief valve part 2 is plugged in with respect to the stop valve part 1, it is always elastically pressed between the pressure relief valve body 21 and the stop valve body 11 (such as Figure 4 、 5 ).

[0029] Finally, it should be noted that Figure 4 、 5 As shown in FIG, a pipe joint 3 is additionally provided on the pressure relief valve body 21. The pipe joint 3 is detachably connected to the pressure relief valve body 21, with one end of the pipe joint directly communicating with the discharge chamber 212, while the other end of the pipe joint directly communicates with the external discharge pipeline. This prevents the direct discharge of overflowing media (especially high-temperature, toxic media), effectively preventing pollution of the external environment and ensuring the personal safety of operators.

[0030] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A combined valve body suitable for safe pressure relief operation of a sampling cylinder, characterized in that: The invention comprises a stop valve part and a pressure relief valve part; the stop valve part comprises a stop valve body, a valve stem, a packing nut and a sealing unit; a valve stem mounting protrusion is formed by the top wall of the stop valve body extending upward; a valve stem mounting cavity for inserting the valve stem is provided in the valve stem mounting protrusion, and the cavity extends all the way to the inside of the stop valve body; the sealing unit is filled in the valve stem mounting cavity, and the circumferential sealing of the valve stem is achieved by the downward pressure of the packing nut; the packing nut is screwed on the valve stem mounting protrusion to achieve the compression of the sealing unit; a transition cavity, a medium discharge cavity and a medium inlet cavity are provided in the stop valve body; the transition cavity is formed by the bottom wall of the valve stem mounting cavity extending downward, and passes through the stop valve body; The medium discharge chamber and the medium inlet chamber are formed by extending inward from the left and right side walls of the stop valve body, and are respectively connected to the transition chamber and the valve stem installation chamber in a one-to-one correspondence; the valve stem is inserted into the valve stem installation chamber, and the on / off state of the valve stem installation chamber and the transition chamber is changed by adjusting the axial relative position thereof; the pressure relief valve part is assembled as a whole with the stop valve part, and is directly connected to the transition chamber; The pressure relief valve part includes a pressure relief valve body, a pressure relief spring and a pressure relief valve core; the pressure relief valve body is detachable to achieve connection with the stop valve body; a valve core accommodating chamber and a flow discharge chamber are provided in the pressure relief valve body; the valve core accommodating chamber is used to accommodate the pressure relief spring and the pressure relief valve core at the same time, and is directly connected with the transition chamber; the pressure relief valve core blocks the lower port of the transition chamber by the elastic pressing force of the pressure relief spring; the flow discharge chamber continues to extend downward from the bottom wall of the valve core accommodating chamber, and until it penetrates the pressure relief valve body; The pressure relief valve body is plugged into the stop valve body and is detachably connected by a threaded pair. Correspondingly, a plug-in installation cavity adapted to the pressure relief valve body extends upward from the bottom wall of the stop valve body. The combined valve body suitable for safe pressure relief operation of the sampling cylinder also includes a pipe joint; the pipe joint is detachable to achieve connection with the pressure relief valve body and is directly communicated with the discharge chamber.

2. The combined valve body suitable for safe pressure relief operation of a sampling cylinder according to claim 1, characterized in that: The pressure relief valve part also includes a rubber sealing ring; the rubber sealing ring is sleeved on the pressure relief valve body, and when the pressure relief valve part is plugged with the stop valve part, the rubber sealing ring is always elastically pressed between the pressure relief valve body and the stop valve body.

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