CN219327817U - Main valve of pressure relief valve - Google Patents
Main valve of pressure relief valve Download PDFInfo
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- CN219327817U CN219327817U CN202320187789.0U CN202320187789U CN219327817U CN 219327817 U CN219327817 U CN 219327817U CN 202320187789 U CN202320187789 U CN 202320187789U CN 219327817 U CN219327817 U CN 219327817U
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Abstract
The present utility model provides a pressure relief valve main valve comprising: the valve body is provided with a sealing cavity and a valve cavity, and is provided with a valve inlet and a valve outlet which are communicated with the valve cavity, the piston assembly comprises a valve rod, a piston and a valve disc, the valve rod is vertically arranged in the valve body in a sliding mode, the piston and the spring are arranged in the sealing cavity, the valve disc is arranged in the valve cavity, the spring is compressed between the piston and the bottom wall of the sealing cavity, and when the sealing cavity and the valve inlet are communicated with the same pressure source, the pressure threshold P0 of the pressure source, the spring force F and the gravity G of the piston assembly are met: p0× (A1-A2) +g=f to move the piston assembly downward to the valve disc to close the valve inlet when the pressure source pressure is greater than the pressure threshold or upward to the valve disc to open the valve inlet when the pressure source pressure is less than the pressure threshold. The utility model solves the technical problems that the main valve of the conventional pressure relief valve can only execute an overpressure protection function, and the valve is closed when the pressure is lower than the opening pressure and cannot be opened manually or automatically.
Description
Technical Field
The utility model relates to the technical field of nuclear power safety, in particular to a main valve of a pressure relief valve.
Background
In pressurized water reactor nuclear power plants, the reactor coolant system is one of the most important barriers for containment of radioactive materials, directly related to the safety performance of the plant.
The reactor coolant system of a nuclear power plant has high pressure during normal operation, and an overpressure protection valve and a loop pressure relief valve are required to be arranged on the reactor coolant system in order to ensure that the system is not overpressurized after an accident and the reactor core is continuously cooled after the accident.
Currently available overpressure protection valves and pressure relief valves mainly include the following:
(1) The spring type safety valve is used for automatically opening and relieving pressure when the system pressure reaches the setting pressure of the safety valve, and the overpressure protection of the prior art system is most widely applied. The safety valve is characterized in that the safety valve can only perform an overpressure protection function, and the safety valve can not be opened manually when the pressure is lower than the opening pressure.
(2) The pilot operated safety valve is similar to a spring type safety valve, and is capable of automatically opening and releasing pressure when the system pressure reaches the setting pressure of the safety valve, so that compared with the spring type safety valve, the pilot operated safety valve is higher in reliability and is mainly applied to a pressure stabilizer safety valve at present. This type of safety valve requires less power when opened, and has a disadvantage in that when manual opening is required, the energized state is required to be maintained all the time, and the open state cannot be maintained at low pressure.
(3) And when the system pressure reaches a design requirement fixed value, the electric or pneumatic isolating valve is controlled to be opened or closed by a power supply. This type of valve is characterized by being able to be opened at any time and to remain in its original state after losing power, which has the disadvantage of requiring a large amount of power for opening.
(4) The explosion valve is used for opening a valve signal to trigger an explosion unit in the valve, high-pressure gas is generated to push a piston in the valve to move, and a shearing cover of the valve diameter can be cut off in impact movement, so that a valve inlet and a valve outlet are connected, and the safety function of pressure relief of a system is realized. This type of valve is characterized by an always open state, once opened, which cannot be restored.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a main valve of a pressure relief valve, which can control the opening and closing of the valve by controlling the pressure of a pressure source in the valve without power supply support.
The technical scheme adopted for solving the technical problems of the utility model is as follows:
the present utility model provides a pressure relief valve main valve comprising: the valve body, the piston component and the spring, the upper part of the valve body is provided with a sealing cavity, the lower part of the valve body is provided with a valve cavity, the bottom of the valve body is provided with a valve inlet, the side surface of the valve body is provided with a valve outlet, the valve inlet and the valve outlet are respectively communicated with the valve cavity,
the piston assembly comprises a valve rod, a piston and a valve disc, wherein the valve rod is vertically arranged in the valve body in a sliding way, the piston is fixed on the valve rod and positioned in the sealing cavity, the valve disc is fixed on the valve rod and positioned in the valve cavity, the spring is positioned in the sealing cavity and compressed between the piston and the bottom wall of the sealing cavity,
when the sealing cavity and the valve inlet are communicated with the same pressure source, the pressure source is set to open the pressure threshold value of the main valve of the pressure relief valve to be P0, and the pressure threshold value, the driving force F of the spring, the gravity G of the piston assembly, the cross sectional area A1 of the piston and the cross sectional area A2 of the valve disc meet the following conditions: p0× (A1-A2) +g=f to move the piston assembly downward to the valve disc to close the valve inlet when the pressure source pressure is greater than the pressure threshold, or upward to the valve disc to open the valve inlet when the pressure source pressure is less than the pressure threshold.
Optionally, the spring is arranged on the valve rod in a penetrating way.
Optionally, the outer diameter of the valve disc gradually decreases from top to bottom, so that the outer wall of the valve disc forms a first conical surface,
the valve inlet is provided with a nozzle communicated with a pressure source, the upper part of the inner wall of the nozzle is provided with a second conical surface matched with the first conical surface, and when the piston assembly moves downwards to be matched with the first conical surface and the second conical surface, the valve disc closes the valve inlet.
Optionally, the valve body includes valve casing and disk seat, the valve casing is located the lower extreme of disk seat and passes through bolted connection with the disk seat, the inner chamber of valve casing forms the valve pocket, the sealed chamber is seted up in the disk seat.
Optionally, the valve seat includes base and case, the top surface of base begins to have first groove, the lower part of case stretches into in the first groove and links to each other with the cell wall seal in first groove, the second groove has been seted up to the bottom surface of case, and the cell wall in second groove encloses with the diapire in first groove and closes and form sealed chamber.
Optionally, the upper portion of case passes through the bolt fastening with the base.
Optionally, a conduit is fixed in the valve core, one end of the conduit extends into the sealing cavity, and the other end extends out of the valve core and is used for being communicated with a pressure source.
Optionally, the valve rod includes the working segment, the lower extreme of working segment links firmly with the valve disc, stretches into the sealed intracavity after its upper end passes the base and links firmly with the piston, the spring wears to locate on the working segment.
Optionally, the valve rod further comprises a positioning section, the upper portion of the valve core is provided with a sealed exhaust cavity, the lower end of the positioning section is fixedly connected with the piston, and the upper end of the positioning section penetrates through the valve core and then stretches into the exhaust cavity.
Optionally, the valve core includes a valve core body and a valve cover, the second accommodating groove is formed on the valve core body, the top surface of the valve core body is provided with a third groove, the valve cover is detachably connected to the top of the valve core body and seals the upper end opening of the third groove, and the groove wall of the third groove and the bottom surface of the valve cover enclose to form the exhaust cavity.
Compared with the pilot-operated safety valve main valve, the pressure relief valve main valve disclosed by the utility model has the advantages that the spring is compressed between the piston and the bottom wall of the sealing cavity, the sealing cavity is communicated with the pressure source communicated with the inlet of the valve, and the pressure threshold of the pressure source, the driving force of the spring and the gravity of the piston assembly meet a certain relational expression, so that the piston assembly can move downwards to the valve disc to close the inlet of the valve when the pressure of the pressure source is greater than the pressure threshold, or can move upwards to the valve disc to open the inlet of the valve when the pressure of the pressure source is less than the pressure threshold, namely, the opening and closing of the valve can be controlled by controlling the pressure of the sealing cavity, and the technical problems that the conventional pilot-operated safety valve main valve only can perform an overpressure protection function and cannot be opened manually or automatically when the pressure of the pressure source is lower than the opening pressure are solved.
Drawings
FIG. 1 is a schematic diagram of a closed state of a main valve of a pressure relief valve according to embodiment 1 of the present utility model;
fig. 2 is a schematic structural diagram of a main valve opening state of a pressure relief valve according to embodiment 1 of the present utility model.
In the figure: 1. a valve housing; 2. a base; 3. a valve core; 31. a valve core body; 32. a valve cover;
4. a valve cavity; 5. a piston; 6. a spring; 7. a working section; 8. a valve disc; 9. a valve inlet;
10. a nozzle; 11. a valve outlet; 12. an exhaust chamber; 13. a positioning section; 14. a conduit;
15. sealing the cavity.
Detailed Description
The following description of the embodiments of the present utility model will be made more apparent, and the embodiments described in detail, but not necessarily all, in connection with the accompanying drawings. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.
In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by "upper" or the like is based on the orientation or positional relationship shown in the drawings, and is merely for convenience and simplicity of description, and is not meant to indicate or imply that the apparatus or element to be referred to must be provided with a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "configured," "mounted," "secured," and the like are to be construed broadly and may be either fixedly connected or detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood by those skilled in the art in specific cases.
The present utility model provides a pressure relief valve main valve comprising: the valve body, the piston component and the spring, the upper part of the valve body is provided with a sealing cavity, the lower part of the valve body is provided with a valve cavity, the bottom of the valve body is provided with a valve inlet, the side surface of the valve body is provided with a valve outlet, the valve inlet and the valve outlet are respectively communicated with the valve cavity,
the piston assembly comprises a valve rod, a piston and a valve disc, wherein the valve rod is vertically arranged in the valve body in a sliding way, the piston is fixed on the valve rod and positioned in the sealing cavity, the valve disc is fixed on the valve rod and positioned in the valve cavity, the spring is positioned in the sealing cavity and compressed between the piston and the bottom wall of the sealing cavity,
when the sealing cavity and the valve inlet are communicated with the same pressure source, the pressure source is set to open the pressure threshold value of the main valve of the pressure relief valve to be P0, and the pressure threshold value, the driving force F of the spring, the gravity G of the piston assembly, the cross sectional area A1 of the piston and the cross sectional area A2 of the valve disc meet the following conditions: p0× (A1-A2) +g=f to move the piston assembly downward to the valve disc to close the valve inlet when the pressure source pressure is greater than the pressure threshold, or upward to the valve disc to open the valve inlet when the pressure source pressure is less than the pressure threshold.
Example 1:
in the technical field of nuclear power safety, a main valve of a pressure relief valve is a main flow path for fluid during pressure relief of a loop, the interior of the valve bears high-temperature and high-pressure fluid, and in order to avoid the influence of the high-temperature fluid and vibration of the loop on a valve control and driving system, the design of the main valve of the mature pressure relief valve is used as a reference, and a driving piston and a driving spring are adopted as an opening and closing energy source of the main valve.
As shown in fig. 1 and 2, the present embodiment provides a pressure relief valve main valve, comprising: the valve body, the piston component and the spring 6, the upper part of the valve body is provided with a sealing cavity 15, the lower part of the valve body is provided with a valve cavity 4, the bottom of the valve body is provided with a valve inlet 9, the side surface of the valve body is provided with a valve outlet 11, the valve inlet 9 and the valve outlet 11 are respectively communicated with the valve cavity 4,
the piston assembly comprises a valve rod, a piston 5 and a valve disc 8, wherein the valve rod is vertically arranged in the valve body in a sliding way, the piston 5 is fixed on the valve rod and positioned in a sealing cavity 15, the valve disc 8 is fixed on the valve rod and positioned in a valve cavity 4, the spring 6 is positioned in the sealing cavity 15 and compressed between the piston 5 and the bottom wall of the sealing cavity 15,
when the seal chamber 15 and the valve inlet 9 are in communication with the same pressure source, the pressure threshold value for opening the main valve of the pressure relief valve by the pressure source is set to be P0, the pressure threshold value, the driving force F of the spring 6, the gravity G of the piston assembly, the cross-sectional area A1 of the piston 5, and the cross-sectional area A2 of the valve disc 8 satisfy: p0× (A1-A2) +g=f to move the piston assembly downward to the valve disc 8 to close the valve inlet 9 when the pressure source pressure is greater than the pressure threshold, or to move the piston assembly upward to the valve disc 8 to open the valve inlet 9 when the pressure source pressure is less than the pressure threshold.
Compared with a conventional main valve of the pressure relief valve, the pressure relief valve has the advantages that the spring 6 is compressed between the piston 5 and the bottom wall of the sealing cavity 15, the sealing cavity 15 is communicated with a pressure source communicated with the valve inlet 9, and the pressure threshold of the pressure source, the driving force of the spring 6 and the gravity of the piston assembly meet the relation, so that the piston assembly can move downwards to the valve disc 8 to close the valve inlet 9 when the pressure source pressure is higher than the pressure threshold, or can move upwards to the valve disc 8 to open the valve inlet 9 when the pressure source pressure is lower than the pressure threshold, namely, the opening and closing of the valve can be controlled by controlling the pressure of the sealing cavity, and the technical problems that the conventional main valve of the pressure relief valve can only perform an overpressure protection function, and cannot be opened manually or automatically when the pressure is lower than the opening pressure are solved.
Therefore, the main valve of the pressure relief valve has the self-sealing and automatic opening functions, can be used as a main hydraulic component for pressure relief and sealing in various scenes, and can be used for the pressure relief of a loop and also can be used for an inactive gravity water injection isolation valve. When the valve is used for the pressure relief of a loop, the diameter of the valve inlet is larger than or equal to DN300, and when the valve is used for a gravity water injection isolation valve, the valve diameter can be properly reduced to DN200 or DN250, so that the flow requirements of the pressure relief of the loop and the gravity water injection of the loop are respectively met.
In summary, the opening, closing and sealing performance of the main valve of the pressure relief valve of the present utility model are maintained by the combined action of the driving spring, the driving piston pressure and the system pressure, and the specific steps are as follows:
the area of the driving piston is larger than that of the valve disc, when the pressure of the sealing chamber is multiplied by the area of the driving piston and the gravity of the piston assembly is multiplied by the pressure of the driving spring and the pressure of the inlet of the valve and the area of the valve disc, the valve is in a closed state, and the sealing of the valve is maintained by means of the differential pressure before and after the inequality;
when the sealing chamber pressure is multiplied by the driving piston area and the gravity of the piston assembly is multiplied by the driving spring pressure and the valve inlet pressure is multiplied by the valve disc area, the valve is opened under the action of the pressure of the driving spring and the internal pressure of the system, and is always in an opened state by the driving spring pressure.
Further, the main valve of the pressure relief valve of the present utility model is shown in table 1 with several pairs of the advantages of the overpressure protection valve and the pressure relief valve commonly used in the field of nuclear power safety as mentioned in the background art.
TABLE 1
In this embodiment, the spring 6 is disposed through the valve rod to provide power for driving the piston to move up and down.
In this embodiment, the outer diameter of the valve disc 8 gradually decreases from top to bottom, so that the outer wall of the valve disc 8 forms a first conical surface,
the valve inlet 9 is provided with a nozzle 10 which is communicated with a pressure source, the upper part of the inner wall of the nozzle 10 is provided with a second conical surface matched with the first conical surface, and when the piston assembly moves downwards to be matched with the first conical surface and the second conical surface, the valve disc 8 closes the valve inlet 9.
The valve disc and the nozzle adopt inclined contact surfaces, when the valve is closed, the nozzle and the valve disc can be tightly matched under the action of pressure difference, so that sealing is better maintained, and coolant leakage is prevented.
In this embodiment, the valve body includes valve casing 1 and disk seat, and valve casing 1 is located the lower extreme of disk seat and passes through bolted connection with the disk seat, and valve cavity 4 is formed to the inner chamber of valve casing 1, and sealed chamber 15 is seted up in the disk seat. The valve shell bottom is provided with a connecting seat and is connected with a pipeline, and the valve outlet is connected with a pressure relief discharge conduit.
In this embodiment, the valve seat includes base 2 and case 3, and the top surface of base 2 begins to have first groove, and the lower part of case 3 stretches into in the first groove and links to each other with the cell wall seal in first groove, and the second groove has been seted up to the bottom surface of case 3, and the cell wall in second groove encloses with the diapire in first groove and closes and form sealed chamber 15. The valve rod can freely slide up and down under the constraint of the base 2.
In this embodiment, the upper part of the valve core 3 is fixedly connected with the base 2 through bolts.
In this embodiment, the valve core 3 is internally fixed with a conduit 14, one end of the conduit 14 extends into the sealing cavity, and the other end extends out of the valve core 3 for communication with a pressure source.
In this embodiment, the valve rod includes the working section 7, and the lower extreme of working section 7 links firmly with valve disc 8, and its upper end stretches into the sealed intracavity after passing base 2 and links firmly with piston 5, and spring 6 wears to locate on the working section 7.
In this embodiment, the valve rod further includes a positioning section 13, the upper portion of the valve core 3 has a sealed exhaust cavity 12, the lower end of the positioning section 13 is fixedly connected with the piston 5, and the upper end of the positioning section passes through the valve core 3 and then extends into the exhaust cavity 12. The positioning section 13 is used for positioning the piston assembly.
In this embodiment, the valve core 3 includes a valve core body 31 and a valve cover 32, the second accommodating groove is formed on the valve core body 31, the top surface of the valve core body 31 is provided with a third groove, the valve cover 32 is detachably connected to the top of the valve core body 31 and seals the upper end opening of the third groove, the valve cover is used for maintaining the sealing of the exhaust cavity and bearing high pressure, and the groove wall of the third groove and the bottom surface of the valve cover 32 enclose to form the exhaust cavity 12.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present utility model, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the utility model, and are also considered to be within the scope of the utility model.
Claims (10)
1. A pressure relief valve main valve, comprising: the valve body, the piston component and the spring (6), the upper part of the valve body is provided with a sealing cavity (15), the lower part of the valve body is provided with a valve cavity (4), the bottom of the valve body is provided with a valve inlet (9), the side surface of the valve body is provided with a valve outlet (11), the valve inlet (9) and the valve outlet (11) are respectively communicated with the valve cavity (4),
the piston assembly comprises a valve rod, a piston (5) and a valve disc (8), wherein the valve rod is vertically arranged in the valve body in a sliding way, the piston (5) is fixed on the valve rod and positioned in a sealing cavity (15), the valve disc (8) is fixed on the valve rod and positioned in a valve cavity (4), a spring (6) is positioned in the sealing cavity (15) and compressed between the piston (5) and the bottom wall of the sealing cavity (15),
when the sealing cavity (15) and the valve inlet (9) are communicated with the same pressure source, the pressure source is set to open the pressure threshold value of the main valve of the pressure relief valve to be P0, and the pressure threshold value, the driving force F of the spring (6), the gravity G of the piston assembly, the cross sectional area A1 of the piston (5) and the cross sectional area A2 of the valve disc (8) meet the following conditions: p0× (A1-A2) +g=f to move the piston assembly downward to the valve disc (8) to close the valve inlet (9) when the pressure source pressure is greater than the pressure threshold, or to move the piston assembly upward to the valve disc (8) to open the valve inlet (9) when the pressure source pressure is less than the pressure threshold.
2. Pressure relief valve main valve according to claim 1, characterized in that the spring (6) is threaded on the valve stem.
3. Pressure relief valve main valve according to claim 1, characterized in that the outer diameter of the valve disc (8) decreases gradually from top to bottom, so that the outer wall of the valve disc (8) forms a first conical surface,
the valve inlet (9) is provided with a nozzle (10) communicated with a pressure source, the upper part of the inner wall of the nozzle (10) is provided with a second conical surface matched with the first conical surface, and when the piston assembly moves downwards to be matched with the first conical surface and the second conical surface, the valve disc (8) closes the valve inlet (9).
4. A pressure relief valve main valve according to any of claims 1-3, characterized in that the valve body comprises a valve housing (1) and a valve seat, the valve housing (1) being located at the lower end of the valve seat and being bolted to the valve seat, the inner cavity of the valve housing (1) forming the valve cavity (4), the sealing cavity (15) being open in the valve seat.
5. The pressure relief valve main valve according to claim 4, characterized in that said valve seat comprises a base (2) and a valve core (3), wherein a first groove is formed at the top surface of said base (2), the lower part of said valve core (3) extends into said first groove and is connected with the groove wall of said first groove in a sealing manner, a second groove is formed at the bottom surface of said valve core (3), and the groove wall of said second groove and the bottom wall of said first groove are enclosed to form said sealing cavity (15).
6. The pressure relief valve main valve according to claim 5, characterized in that the upper part of said valve core (3) is bolted to the base (2).
7. The pressure relief valve main valve according to claim 5, characterized in that a conduit (14) is fixed in said valve core (3), one end of said conduit (14) extending into the sealing chamber and the other end extending out of the valve core (3) for communication with a pressure source.
8. The pressure relief valve main valve according to claim 5, wherein said valve rod comprises a working section (7), the lower end of said working section (7) is fixedly connected with a valve disc (8), the upper end thereof passes through the base (2) and then extends into the sealing cavity and is fixedly connected with the piston (5), and said spring (6) is arranged on said working section (7) in a penetrating manner.
9. The pressure relief valve main valve according to claim 8, characterized in that said valve stem further comprises a positioning section (13), the upper part of said valve core (3) has a sealed exhaust chamber (12), the lower end of said positioning section (13) is fixedly connected with the piston (5), and the upper end thereof extends into said exhaust chamber (12) after passing through the valve core (3).
10. The pressure relief valve main valve according to claim 9, characterized in that the valve core (3) comprises a valve core body (31) and a valve cover (32), the second accommodating groove is formed on the valve core body (31), the top surface of the valve core body (31) is provided with a third groove, the valve cover (32) is detachably connected to the top of the valve core body (31) and seals the upper end opening of the third groove, and the groove wall of the third groove and the bottom surface of the valve cover (32) are enclosed to form the exhaust cavity (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320187789.0U CN219327817U (en) | 2023-01-28 | 2023-01-28 | Main valve of pressure relief valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320187789.0U CN219327817U (en) | 2023-01-28 | 2023-01-28 | Main valve of pressure relief valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219327817U true CN219327817U (en) | 2023-07-11 |
Family
ID=87067436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320187789.0U Active CN219327817U (en) | 2023-01-28 | 2023-01-28 | Main valve of pressure relief valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219327817U (en) |
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2023
- 2023-01-28 CN CN202320187789.0U patent/CN219327817U/en active Active
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