Pressure load safety valve

Abstract

This application discloses a pressure load safety valve, comprising: a main flow channel and a valve cavity arranged along the length of a valve body; a movable valve disc disposed inside the valve cavity; and one end of the main flow channel extending into the movable valve disc. A guide gap is provided between the outer peripheral surface of the movable valve disc and the inner wall of the valve cavity. A sealing portion is provided on the end face of the movable valve disc, extending towards the inner wall of the valve cavity. The movable valve disc can move along the length of the valve body. When the movable valve disc moves a certain distance, the surface of the sealing portion will cover and seal the guide gap. The side of the main flow channel is connected to the valve cavity through a branch channel. A first through hole is opened in the movable valve disc to connect to the main flow channel, and the main flow channel maintains at least one end in a connected state. Pressure load is delivered towards the movable valve disc and enters the main flow channel through the first through hole. The guide gap reduces the frictional resistance generated by the movement of the movable valve disc and ensures that the pressure load medium is prevented from leaking from the guide gap after the movable valve disc moves to a set position.

Description

Technical Field

[0001] This application relates to the field of safety relief device technology, specifically to a pressure load safety valve. Background Technology

[0002] Currently, widely used large-diameter safety pressure relief devices mainly include several types such as direct spring load type, pilot pulse type, and static weight lever type. The direct spring load type results in a large size, causing numerous inconveniences in product manufacturing, transportation, installation, and commissioning. The pilot pulse type is unusable due to leakage caused by high medium temperature, while the static weight lever type, due to its structure, cannot achieve the product's performance indicators such as overpressure and opening / closing pressure differential.

[0003] Therefore, how to provide a large-diameter, large-displacement safety pressure relief protection device is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this application is to provide a large-diameter, large-displacement pressure load safety valve that is suitable for high-temperature dynamic sealing.

[0005] To achieve the above objectives, this application provides a pressure load safety valve, comprising: a valve body, wherein a main flow channel and a valve cavity are provided along the length of the valve body, and a movable valve disc is provided in the valve cavity; one end of the main flow channel is connected to the movable valve disc; a branch flow channel is provided on the side of the main flow channel for connecting to the valve cavity; and the movable valve disc is provided with a first through hole for connecting to the main flow channel, the first through hole being used for input of pressure load medium.

[0006] A guide gap is provided between the outer peripheral surface of the movable valve disc and the inner wall of the valve cavity; a sealing part is provided on the end face of the movable valve disc facing the length direction of the main channel, and the sealing part extends towards the inner wall of the valve cavity; the movable valve disc can move along the length direction of the main channel so that the sealing part seals the guide gap.

[0007] In some embodiments, a switching control valve stem is provided in the main channel, which can move along the length of the main channel to control the flow of the pressure load medium.

[0008] The on / off control valve stem includes: a slide valve stem with a gap between it and the main channel, the two ends of the slide valve stem being respectively provided with a first sealing end and a second sealing end for sealing the main channel, and the length of the slide valve stem being greater than the length of the main channel to ensure that at least one end of the main channel is connected.

[0009] In some embodiments, a guide valve is sleeved on the surface of the valve stem for guiding movement, and a gap is provided between the guide valve and the inner wall of the main channel.

[0010] In some embodiments, a groove is provided at the top of the movable valve disc, a gap is provided between the side wall of the second sealing end and the inner wall of the groove, and the first through hole communicates with the groove.

[0011] In some embodiments, a throttling cavity is provided inside the movable valve disc, the end face of the sealing part seals the top surface of the throttling cavity, and a second through hole communicating with the throttling cavity is provided inside the movable valve disc.

[0012] In some embodiments, the outer peripheral surface of the movable valve disc is provided with an annular groove along the circumferential direction, and a guide ring is provided in the annular groove.

[0013] In some embodiments, the sealing part is configured as a non-metallic sealing plate, the bottom of which is used to cover the guide gap opening.

[0014] In some embodiments, a pressure relief chamber is provided on the outer side of the main channel away from the movable valve disc, and a pressure relief pipe communicating with the pressure relief chamber is provided through the valve body.

[0015] In some embodiments, a valve seat is provided at the bottom of the valve body, the valve seat is located below the valve cavity, and the valve seat is provided with a flow channel for the pressure load medium to flow in.

[0016] In some embodiments, a signal control valve is provided on the top of the valve body, which is used to control the movement of the on / off control valve stem.

[0017] Compared to the aforementioned background technology, this application includes a valve body with a main flow channel and a valve cavity arranged along its length inside the valve body. A movable valve disc is disposed inside the valve cavity, and one end of the main flow channel extends into the movable valve disc. A guide gap is provided between the outer circumferential surface of the movable valve disc and the inner wall of the valve cavity. A sealing part is provided on the end face of the movable valve disc, extending towards the inner wall of the valve cavity. The movable valve disc can move along the length of the valve body. When the movable valve disc moves a certain distance, the surface of the sealing part will cover and seal the guide gap. The side of the main flow channel is connected to the valve cavity through a branch channel. A first through hole is opened in the movable valve disc to connect to the main flow channel, and the main flow channel maintains at least one end in a connected state. Pressure load is delivered towards the movable valve disc and enters the main flow channel through the first through hole. The guide gap reduces the frictional resistance generated by the movement of the movable valve disc and ensures that the pressure load medium does not leak from the guide gap after the movable valve disc moves to the set position. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the pressure load safety valve provided in the embodiment of this application;

[0020] Figure 2 This is a partial structural diagram of the pressure load safety valve in the closed state provided in the embodiment of this application;

[0021] Figure 3 for Figure 2 Enlarged view of a portion of the structure in section A;

[0022] Figure 4 This is a partial structural diagram of the pressure load safety valve provided in the embodiment of this application in the open state;

[0023] Figure 5 for Figure 4 Enlarged view of a local structure in section B;

[0024] Figure 6 This is a schematic diagram of the assembly of the spool valve stem and the second sealing end;

[0025] Figure 7 This is a schematic diagram of the internal cross-section of the main channel.

[0026] in:

[0027] 1-Valve body, 2-Main flow channel, 3-Valve cavity, 4-Moving valve disc, 41-First through hole, 42-Second through hole, 5-Guide interval, 6-Branch channel, 7-On / off control valve stem, 71-Slide valve stem, 72-First sealing end, 73-Second sealing end, 74-Guide slide valve, 8-Guide ring, 9-Non-metallic sealing plate, 10-Pressure relief pipe, 11-Valve seat, 12-Signal control valve. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Reference manual attached Figure 1 , attached Figure 1The schematic diagram of the pressure load safety valve provided in the embodiments of this application (arrows in all the accompanying drawings of this application represent the flow direction of the pressure load medium P) includes: a main flow channel 2 and a valve cavity 3 arranged along the length direction inside the valve body 1. The valve cavity 3 is located below the main flow channel 2, and a movable valve disc 4 is arranged inside the valve cavity 3. One end of the main flow channel 2 extends into the movable valve disc 4. A guide gap 5 is provided between the outer peripheral surface of the movable valve disc 4 and the inner wall of the valve cavity 3. A sealing part is provided on the end face of the movable valve disc 4 facing the length direction of the main flow channel 2, and the edge of the sealing part extends towards the inner wall of the valve cavity 3. The movable valve disc 4 can move along the length direction of the valve body 1. When the movable valve disc 4 moves a certain distance away from the main flow channel 2, the surface of the sealing part will cover and seal the opening of the guide gap 5. The surface area of ​​the sealing part on the side away from the guide gap 5 is larger than the opening area of ​​the guide gap 5, so that the pushing force of the pressure load medium P on the sealing part is greater than the force that rushes out from the guide gap 5. The side surface of the main flow channel 2 is connected to the valve chamber 3 via the branch flow channel 6. The outlet of the branch flow channel 6 is positioned facing the sealing part away from the guide gap 5. A first through hole 41 is provided in the movable valve disc 4 to connect to the main flow channel 2, and at least one end of the main flow channel 2 is kept in a connected state. The high-temperature pressure load P is conveyed towards the side of the movable valve disc 4 away from the sealing part under the flow control, and enters the main flow channel 2 through the first through hole 41. The pressure load P is usually a common valve pressurization medium such as hot oil or hot water. The guide gap 5 avoids large frictional resistance during the movement of the movable valve disc 4, and prevents the pressure load medium P from leaking from the guide gap 5 after the movable valve disc 4 moves to the set position.

[0031] Reference manual attached Figure 2 -Appendix Figure 5 , Figure 2 This is a partial structural diagram of the pressure load safety valve in the closed state provided in the embodiments of this application. Figure 3 for Figure 2 Enlarged view of the partial structure of part A in the middle. Figure 4 This is a partial structural diagram of the pressure load safety valve in the open state provided in the embodiments of this application. Figure 5 for Figure 4The enlarged view of a partial structure in part B of this application includes: In an embodiment where the main flow channel 2 and the valve cavity 3 are vertically arranged inside the valve body 1, when the safety valve needs to be sealed shut, the control pressure load P flows towards the bottom of the movable valve disc 4, keeping one end of the main flow channel 2 connected within the movable valve disc 4 while the other end remains closed. At this time, the pressure load medium P enters the valve body 1 in two paths. The first path enters through the guide gap 5 between the movable valve disc 4 and the inner wall of the valve cavity 3, simultaneously generating a force that pushes the movable valve disc 4 upward. The second path flows into the main channel 2 from the first through hole 41. The pressure load medium P flows along the main channel 2 into the branch channel 6 and is output towards the top surface of the sealing part. Since the area of ​​the top surface of the sealing part is much larger than the opening area of ​​the guide gap 5, the force provided by the pressure load medium P will make the sealing part tightly cover the opening of the guide gap 5. Assuming that the opening area of ​​the guide gap 5 is A1 and the top surface area of ​​the sealing part is A2, the area difference between the two is ΔA=A2–A1. F=P*ΔA is used as the pressure load to realize the closing force F of the movable valve disc 4, thus completing the tight seal.

[0032] When the safety valve needs to be sealed and opened for pressure relief, the control pressure load P flows towards the bottom of the movable valve disc 4, keeping one end of the main flow channel 2 within the movable valve disc 4 closed. At this time, the pressure load medium P flows only from the guide gap 5 to the branch pipe 6, pushing the movable valve disc 4 upwards. The pressure load medium P then flows through the branch pipe 6 to the top of the main flow channel 2, keeping the other end of the main flow channel 2 open, thus achieving pressure relief by the safety valve.

[0033] The structure of this application creates a space filled with the pressure load medium P inside the valve cavity 3, replacing the weight of the traditional bulky force-applying structure (such as a hammer or lever), thus avoiding the valve from generating huge loads on the pipeline or container and increasing the service life of the equipment.

[0034] Further, please refer to the attached instructions. Figure 6 and attached Figure 7 , Figure 6 This is a schematic diagram of the assembly of the valve stem and the second sealing end. Figure 7This is a schematic diagram of the internal cross-section of the main channel 2, including: a control valve stem 7 is installed in the gap within the main channel 2, and the pressure load medium P flows within the gap between the inner wall of the main channel 2 and the control valve stem 7. The control valve stem 7 includes: a slide valve stem 71, with a first sealing end 72 and a second sealing end 73 respectively provided at both ends of the slide valve stem 71. The first sealing end 72 is used to seal the end of the main channel 2 located outside the movable valve disc 4, while the second sealing end 73 is used to seal the end of the main channel 2 located inside the movable valve disc 4. Simultaneously, the length of the slide valve stem 71 is set to be greater than the length of the main channel 2, and the control valve stem 7 can move along the length direction of the main channel 2. Thus, during the use of the control valve stem 7, at least one end of the main channel 2 will remain connected, realizing the opening and closing of the valve body seal and controlling the flow of the pressure load medium P within the main channel 2.

[0035] The first sealing end 72 can refer to a conventional sealing structure, while the second sealing end 73 is a column with a groove at the top, filled with graphite. Graphite is used to seal the non-metallic structure of the main channel 2 port, ensuring zero leakage. Alternatively, the second sealing end 73 can be a conventional metal sealing structure, and its configuration can be referenced from existing technologies, which will not be elaborated upon here. A groove for the column to move is provided inside the movable valve disc 4. A gap is provided between the column's sidewall and the groove's inner wall. The first through hole 41 communicates with the groove, and the column is located between the main channel 2 port and the first through hole 41. When the main channel 2 needs to be connected to the port inside the movable valve disc 4, the column is kept at a distance from the port, allowing the pressure-loaded medium P to flow into the main channel 2 from the gap in the groove. When the valve stem 71 moves a certain distance towards the first sealing end 72, the column of the second sealing end 73 comes into contact with the main channel 2 port for sealing, thereby achieving instantaneous on / off control of the pressure-loaded medium P within the main channel 2.

[0036] Furthermore, a guide valve 74 is fitted onto the surface of the aforementioned valve stem 71, and a gap is provided between the guide valve 74 and the inner wall of the main flow channel 2 to allow the pressure load medium P to flow. In this embodiment, the guide valve 74 is milled with three flat structures along its outer circumferential direction. The circular outer edges of the flat structures are close to the inner wall of the main flow channel 2, thereby guiding the movement of the valve stem 71. The planar structure of the flat structure maintains a gap with the inner wall of the main flow channel 2, thus ensuring the normal flow of the load medium P. The valve stem 71 equipped with the guide valve 74 also has increased rigidity and is less prone to damage.

[0037] Of course, other guide valves 74 can also be configured as cylindrical, and other conventional valve structures such as flow holes can be opened inside the cylinder along the length of the valve rod 71 to replace them. This article will not elaborate further.

[0038] Furthermore, the aforementioned movable valve disc 4 also has a throttling chamber inside, the top surface of which is sealed by the end face of the sealing part. In this embodiment, this end face and the surface of the sealing part used to seal the guide gap 5 are located on the same side. The movable valve disc 4 also has a second through hole 42 for connecting to the throttling chamber. When the guided pressure load medium P flows towards the movable valve disc 4, it also flows into the throttling chamber through the second through hole 42. During the opening and closing of the movable valve disc 4, the pressure difference formed between the throttling chamber and the outside environment helps the movable valve disc 4 close.

[0039] Specifically, taking the embodiments of this application as an example: When the pressure P reaches the preset pressure value, the signal control valve 12 actuates, and the pressure-loaded medium P in the valve chamber 3 is released. At this time, the medium pressure forms flow under the action of the pressure-loaded medium P input at the inlet, and the second through hole 42 throttles to form a pressure difference ΔP1. At this time, the movable valve disc 4 actuates, and the pressure in the valve chamber 3 is P′=P-ΔP1. The force acting on the top surface of the movable valve disc 4 is less than the force acting on the bottom surface of the movable valve disc 4, and the movable valve disc 4 quickly rises to discharge. During the medium flow process from before the signal control valve 12 closes until it closes, due to the action of the on / off control valve stem 7, the slide valve stem 71, the first sealing end 72, and the second sealing end 73, the pressure P′+ΔP1 in the valve chamber 3 increases rapidly until the movable valve disc 4 is completely closed. At this time, the pressure difference ΔP1 helps the movable valve disc 4 close and reseat.

[0040] Furthermore, an annular groove is provided on the outer circumferential surface of the aforementioned movable valve disc 4, and a guide ring 8 is provided within the annular groove. The guide ring 8 guides the movement between the movable valve disc 4 and the inner wall of the valve cavity 3, and avoids direct contact between the two to prevent wear, thereby increasing the service life of the equipment. The specific structure and usage of the aforementioned guide ring 8 can be found in existing technology, and will not be elaborated further in this article.

[0041] Furthermore, the aforementioned sealing part is configured as a non-metallic sealing plate 9. The portion of the non-metallic sealing plate 9 near the edge of the valve cavity 3 is provided with a trapezoidal extension structure. The non-metallic sealing plate 9 can be fixed to the end face of the movable valve disc 4 by bolt connection. At the same time, the inner wall of the valve cavity 3 located above the guide gap 5 is inclined, thereby leaving room for the movement of the non-metallic sealing plate 9.

[0042] The aforementioned non-metallic sealing plate 9 has high temperature resistance, which not only seals the high temperature medium, but also ensures that the seal is at least along the length of the movable valve disc 4, without affecting the radial friction ratio pressure of the movable valve disc 4, and thus does not affect the sensitive opening and closing performance.

[0043] Of course, the non-metallic sealing plate 9 is not limited to being set as a trapezoidal extension structure. Other structures, such as disc-shaped or frustum-shaped structures, can also be used as alternatives, which will not be elaborated on in this article.

[0044] Furthermore, the non-metallic sealing plate 9 has a certain degree of toughness. When subjected to pressure load medium P, it will generate bending torque, making its seal on the guide gap 5 more tight.

[0045] Furthermore, a pressure relief chamber is provided inside the valve body 1. The pressure relief chamber is located on the outer side of the main channel 2 away from the movable valve disc 4, and the pressure relief chamber is connected to a pressure relief pipe 10 for valve pressure relief.

[0046] Furthermore, a valve seat 11 is provided at the bottom of the valve body 1. The valve seat 11 is located below the valve cavity 3 and has a flow channel for the pressure load medium P to flow in. The flow channel is directed toward the movable valve disc 4.

[0047] Furthermore, a signal control valve 12 is provided on the top of the valve body 1. The signal control valve 12 is used to control the movement of the on / off control valve stem 7, thereby controlling the flow of the pressure-loaded medium P. The opening pressure Ps (i.e., the inlet pressure chamber pressure in the valve body 1) of the signal control valve 12 can be manually set. The signal control valve 12 is used to replace the bulky direct-acting structure of traditional large-diameter safety valves, thus realizing a pressure-loaded safety valve and achieving the function of controllable and adjustable pressure.

[0048] Referring to the existing signal control valve 12, it can be configured as a small-diameter spring safety valve, with the opening pressure value set by adjusting the spring force. When the pressure P in the valve chamber 3 reaches the opening pressure Ps set by the signal control valve 12, the small-diameter spring safety valve opens to release the pressure P in the valve chamber 3, thereby opening the movable valve disc 4 (i.e., the pressure load safety valve releases). When the small-diameter spring safety valve reseats and closes, the pressure P in the valve chamber 3 is re-established, thereby closing the movable valve disc 4 (i.e., the pressure load safety valve reseats and closes). The signal control valve 12 is an automatic process device for opening, releasing, and reseating. It should have high-performance configuration during the automatic process, and simultaneously achieve the on / off switching function of the main flow channel 2 through the slide valve stem 71. Its performance and functional indicators determine the high-performance indicators for the final automatic opening and closing of the pressure load safety valve. The signal control valve 12 provides convenient and quick adjustment of the safety valve's opening and closing, facilitating installation, transportation, and commissioning.

[0049] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0050] The pressure load safety valve provided in this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A pressure-loaded safety valve, characterized in that include: A valve body (1) has a main channel (2) and a valve cavity (3) along its length. A movable valve disc (4) is provided in the valve cavity (3). One end of the main channel (2) is connected to the movable valve disc (4). A branch channel (6) is provided on the side of the main channel (2) to connect to the valve cavity (3). The movable valve disc (4) has a first through hole (41) connecting to the main channel (2). The first through hole (41) is used to input the pressure load medium. A guide gap (5) is provided between the outer peripheral surface of the movable valve disc (4) and the inner wall of the valve cavity (3); a sealing part is provided on the end face of the movable valve disc (4) facing the length direction of the main channel (2), and the sealing part extends towards the inner wall of the valve cavity (3); the movable valve disc (4) can move along the length direction of the main channel (2) so that the sealing part seals the guide gap (5). The valve chamber (3) is located on the inner wall above the guide interval (5) and is inclined. The movable valve disc (4) is provided with a non-metallic sealing plate (9) on its end face facing the main channel (2) along its length. The edge of the non-metallic sealing plate (9) extends toward the inner wall of the valve cavity (3) and has a trapezoidal extension structure. The inner wall of the valve cavity (3) above the guide interval (5) is inclined to provide movement space for the non-metallic sealing plate (9). A throttling cavity is provided in the movable valve disc (4). The top of the throttling cavity is sealed by the end face of the non-metallic sealing plate (9). A second through hole (42) communicating with the throttling cavity is provided in the movable valve disc (4) to form a pressure difference during the closing process to assist in closing.

2. The pressure-loaded safety valve of claim 1, wherein The main channel (2) is provided with an on / off control valve stem (7), which can move along the length of the main channel (2) to control the flow of pressure load medium; The on / off control valve stem (7) includes a slide valve stem (71) with a gap between it and the main channel (2). The two ends of the slide valve stem (71) are respectively provided with a first sealing end (72) and a second sealing end (73) for sealing the main channel (2), and the length of the slide valve stem (71) is greater than the length of the main channel (2) to ensure that at least one end of the main channel (2) is connected.

3. The pressure-loaded safety valve of claim 2, wherein The surface of the valve stem (71) is fitted with a guide valve (74) for guiding movement, and a gap is provided between the guide valve (74) and the inner wall of the main channel (2).

4. The pressure-loaded safety valve of claim 2, wherein The top of the movable valve disc (4) is provided with a sliding groove, and a gap is provided between the side wall of the second sealing end (73) and the inner wall of the sliding groove. The first through hole (41) is connected to the sliding groove.

5. The pressure-loaded safety valve of claim 1, wherein The outer circumferential surface of the movable valve disc (4) is provided with an annular groove in the circumferential direction, and a guide ring (8) is provided in the annular groove.

6. The pressure-loaded safety valve of claim 1, wherein The valve body (1) has a pressure relief chamber on the outer side of the main channel (2) away from the movable valve disc (4), and the valve body (1) is provided with a pressure relief pipe (10) that communicates with the pressure relief chamber.

7. The pressure-loaded safety valve according to any one of claims 1-6, characterized in that The bottom of the valve body (1) is provided with a valve seat (11), which is located below the valve cavity (3). The valve seat (11) is provided with a flow channel for the pressure load medium to flow in.

8. The pressure-loaded safety valve of claim 2, wherein, A signal control valve (12) is provided on the top of the valve body (1), and the signal control valve (12) is used to control the movement of the on / off control valve stem (7).

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