CN111365502A - Pilot-operated safety valve of voltage stabilizer of nuclear power station - Google Patents
Pilot-operated safety valve of voltage stabilizer of nuclear power station Download PDFInfo
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- CN111365502A CN111365502A CN202010300174.5A CN202010300174A CN111365502A CN 111365502 A CN111365502 A CN 111365502A CN 202010300174 A CN202010300174 A CN 202010300174A CN 111365502 A CN111365502 A CN 111365502A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/10—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with auxiliary valve for fluid operation of the main valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0644—One-way valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses a pilot operated safety valve of a nuclear power station voltage stabilizer, which comprises a main valve, spring type pilot valves, a first electromagnetic pilot valve, a second electromagnetic pilot valve, a first isolation valve, a second isolation valve and a third isolation valve, wherein pressure induction ports of two groups of symmetrically arranged spring type pilot valves are respectively connected with an inlet of the main valve through the second isolation valve, pressure control ports of the two groups of spring type pilot valves are respectively connected with a main valve cavity of the main valve through the second electromagnetic pilot valves and the first isolation valve which are sequentially connected, and exhaust ports of the two groups of spring type pilot valves are connected with an exhaust pipeline; the inlet of the first electromagnetic pilot valve is connected with the main valve cavity of the main valve, and the outlet of the first electromagnetic pilot valve is connected with the discharge pipeline; the inlet of the third isolating valve is connected with the main valve cavity of the main valve, and the outlet of the third isolating valve is connected with the pressure display instrument. The invention is applied to the nuclear power field, has complete functions of the valve, can effectively improve the stability and the reliability of the valve, and can realize online setting pressure check.
Description
Technical Field
The invention relates to the field of nuclear power, in particular to a pilot safety valve of a nuclear power station voltage stabilizer.
Background
The safety valve of the existing nuclear power station voltage stabilizer comprises a spring type safety valve and a pilot type safety valve. At present, all the manostat pilot operated safety valves in all nuclear power plants in service and under construction in China depend on imports, and suppliers of the manostat pilot operated safety valves abroad mainly comprise companies such as Sebim in France, Sempell in Germany, CCI in Switzerland and the like. The pilot operated safety valves of the voltage stabilizers of the companies adopt the same operating principle of the pilot operated main valve, but the products of the companies are different in structure and have larger differences, other functions except the overpressure protection function are incomplete, and the reliability and safety performance of the valve are not fully considered or different measures are taken. How to fill the technical blank of the pilot safety valve of the voltage stabilizer of the nuclear power station in China is the main target of technical personnel.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a pilot operated safety valve of a nuclear power station voltage stabilizer, which is applied to the field of nuclear power, has complete functions and high stability and reliability and can realize on-line setting pressure check.
One technical scheme for achieving the above purpose is as follows: a pilot safety valve of a nuclear power station voltage stabilizer comprises a main valve, a spring type pilot valve, a first electromagnetic pilot valve, a second electromagnetic pilot valve, a first isolation valve, a second isolation valve and a third isolation valve, wherein the main valve is provided with a main valve inlet and a main valve outlet, and the spring type pilot valve is provided with a pressure sensing port, a pressure control port and an exhaust port;
the pressure induction ports of the two groups of spring type pilot valves which are symmetrically arranged are respectively connected with the inlet of the main valve through the second isolation valve, the pressure control ports of the two groups of spring type pilot valves are respectively connected with the main valve cavity of the main valve through a second electromagnetic pilot valve and a first isolation valve which are sequentially connected, and the exhaust ports of the two groups of spring type pilot valves are connected with an exhaust pipeline;
the inlet of the first electromagnetic pilot valve is connected with the main valve cavity of the main valve, and the outlet of the first electromagnetic pilot valve is connected with a discharge pipeline;
and the inlet of the third isolating valve is connected with the main valve cavity of the main valve, and the outlet of the third isolating valve is connected with the pressure display instrument.
Furthermore, the main valve is a pressure loading type main valve, a main valve cavity is formed between the upper part of the valve clack and the valve cover, and the opening and closing of the valve clack of the main valve are controlled by controlling the pressure of the main valve cavity.
Furthermore, the spring type pilot valve is a pressure balance spring type safety valve with a corrugated pipe.
Still further, the pressure balance spring type safety valve is additionally provided with an electromagnetic driving device.
Still further, the pressure balance spring type safety valve is additionally provided with a pneumatic, electric, hydraulic or gas-liquid linkage driving device.
Furthermore, the first electromagnetic pilot valve is formed by connecting two identical normally-closed electromagnetic valves in series and is a normally-closed valve.
Further, the second electromagnetic pilot valve is a normally open valve.
Further, the first isolation valve, the second isolation valve and the third isolation valve are manual stop valves.
Still further, the second isolating valve is internally provided with a check valve and is provided with an external pressure source interface.
The pilot operated safety valve of the nuclear power station voltage stabilizer has the following advantages:
1) the invention relates to a pilot operated safety valve of a nuclear power station voltage stabilizer, wherein two groups of spring type pilot valves are connected with a main valve in parallel, and the two groups of spring type pilot valves can be used one by one according to actual requirements or can be used simultaneously. If two groups of spring type pilot valves are used and prepared in actual use, the maintenance time of the pilot type safety valve of the voltage stabilizer can be greatly reduced during shutdown. If two groups of spring type pilot valves are used in parallel in actual use, the reliability of the pilot type safety valve of the voltage stabilizer can be improved.
2) The pilot operated safety valve of the nuclear power station voltage stabilizer adopts a pressure balance spring type safety valve with a corrugated pipe, and the spring type pilot valve can also be selectively added with an electromagnetic driving device. The electromagnetic coil of the electromagnetic driving device can generate an additional closing force or opening force to help the pilot valve to seal or open and close; the spring loaded pilot valve can still perform its full function even when its solenoid drive fails on loss of power. Therefore, the electromagnetic spring type pilot valve increases the sealing performance of the pilot valve, improves the opening and closing reliability of the pilot valve, and increases the reliability of the pilot safety valve of the voltage stabilizer.
3) The first electromagnetic pilot valve is formed by connecting two identical normally-closed electromagnetic valves in series, and the sealing reliability of the pressure boundary is improved.
4) The check valve is arranged in the second isolating valve, and an external pressure source interface is designed, so that the on-line calibration of the pilot valve set pressure can be realized.
5) A second electromagnetic pilot valve is arranged between a pressure control port of the spring type pilot valve and a main valve cavity of the main valve, so that the main valve can be closed forcibly, and the reliability is further improved.
6) The modularized and integrated design of the pilot safety valve of the voltage stabilizer can select the function of forcibly closing a main valve and the function of online debugging the set pressure of a pilot valve, and can select a spring type pilot valve with an electromagnetic driving device.
Drawings
Fig. 1 is a schematic structural diagram of a pilot operated safety valve of a nuclear power plant voltage stabilizer according to the present invention.
Detailed Description
In order to better understand the technical solution of the present invention, the following detailed description is made by specific examples:
the pilot operated safety valve of the nuclear power station voltage stabilizer is arranged at the top of a primary circuit voltage stabilizer of a nuclear power station, and provides overpressure protection functions (including hot overpressure protection and cold overpressure protection) and Feed-discharge functions of an RCP system.
Referring to fig. 1, the pilot operated safety valve of the nuclear power plant regulator of the present invention mainly comprises a main valve 1, a spring type pilot valve 2, a first electromagnetic pilot valve 31, a second electromagnetic pilot valve 32, a first isolation valve 41, a second isolation valve 42, a third isolation valve 43, and the like.
The main valve 1 is a pressure-loaded main valve, and the main valve 1 has a main valve inlet and a main valve outlet. A main valve cavity is formed between the upper part of the main valve clack and the valve cover, and the opening and closing of the main valve clack are controlled by controlling the pressure of the main valve cavity.
The spring type pilot valve 2 is a pressure balance spring type safety valve with a corrugated pipe, and an electromagnetic driving device is arranged on the spring type pilot valve. The solenoid may generate an additional closing or opening force to assist in sealing or opening the pilot valve. The spring type pilot valve is provided with a pressure sensing port, a pressure control port and an exhaust port. The mode of increasing the auxiliary force of the spring type pilot valve 2 is not limited to electromagnetic driving, and other driving modes such as pneumatic, electric, hydraulic, gas-liquid linkage and the like can be adopted.
The first electromagnetic pilot valve 31 and the second electromagnetic pilot valve 32 are pilot-operated isolation valves, and are driven by electromagnetic force to open and close the isolation valves. The first electromagnetic pilot valve 31 is formed by connecting two identical normally closed electromagnetic valves in series, is a normally closed valve, and increases the sealing reliability due to the series design; the second electromagnetic pilot valve 32 is a normally open valve. The first electromagnetic pilot valve 31 and the second electromagnetic pilot valve 32 each have an inlet and an outlet.
The first isolation valve 41, the second isolation valve 42 and the third isolation valve 43 are manual shut-off valves, and the second isolation valve 42 is provided with a check valve 421 and an external pressure source interface 422. Each isolation valve has an inlet and an outlet.
The pressure sensing port of the spring type pilot valve 2 is connected with the inlet of the main valve 1 through a second isolation valve 42, and the pressure control port of the spring type pilot valve 2 is connected with the main valve cavity of the main valve 1 through a second electromagnetic pilot valve 32 and a first isolation valve 41 which are connected in sequence. The exhaust port of the spring-loaded pilot valve 2 is connected to an exhaust line. The spring type pilot valves 2 are divided into two groups and are symmetrically arranged on two sides of the main valve body in the connection mode.
The inlet of the first electromagnetic pilot valve 31 is connected to the main valve chamber of the main valve 1 and the outlet of the first electromagnetic pilot valve 31 is connected to the discharge line.
The inlet of the third isolation valve 43 is connected to the main valve chamber of the main valve 1 and the outlet of the third isolation valve 43 is connected to the pressure display gauge 5.
Under the normal working condition of the system, the valve clack of the main valve 1, the spring type pilot valve 2, the second electromagnetic pilot valve 32, the first electromagnetic pilot valve 31, the first isolation valve 41, the second isolation valve 42 and the third isolation valve 43 of the pressure stabilizer pilot type safety valve are closed, and the external pressure source interface of the second isolation valve 42 is closed.
The pressure stabilizer pilot operated safety valve of the invention has the following functional modules.
1) Thermal state overpressure protection
The main valve 1, the spring type pilot valve 2, the second electromagnetic pilot valve 32, the first isolation valve 41 and the second isolation valve 42 in the figure 1 complete thermal overpressure protection.
The working medium is saturated steam in thermal overpressure protection. During thermal state overpressure protection, the first electromagnetic pilot valve 31 is closed, the third isolation valve 43 is opened, and the external pressure source port of the second isolation valve 42 is closed. When the system pressure is abnormally over-pressurized, the system pressure reaches the opening pressure of the spring type pilot valve 2, the valve clack of the spring type pilot valve 2 is opened, the pressure of a main valve cavity in the main valve 1 is discharged, the pressure of the main valve cavity is reduced, and the valve clack of the main valve 1 is automatically opened under the action of system medium force, so that the pressure in the system is discharged. When the system pressure drops to the return pressure after the main valve 1 is opened, the valve clack of the spring type pilot valve 2 is closed, the pressure of the main valve cavity in the main valve 1 rises, and the valve clack of the main valve 1 is closed under the action of medium force. The process realizes the thermal state overpressure protection of the system by the pressure stabilizer pilot operated safety valve.
If the spring type pilot valve with an electromagnetic driving device is selected as the spring type pilot valve of the pilot type safety valve of the voltage stabilizer, the opening and the closing of the spring type pilot valve are determined by control signals (the opening pressure is set as an opening signal, and the recoil pressure is set as a closing signal).
The thermal state overpressure protection is automatically realized through a valve without operator intervention.
2) Cold state overpressure protection
The main valve 1 and the first electromagnetic pilot valve 31 complete cold overpressure protection.
The working medium is supercooled water in cold overpressure protection. In the cold overpressure protection process, the spring type pilot valve 2 is closed, the second electromagnetic pilot valve 32 is opened, the first isolation valve 41, the second isolation valve 42 and the third isolation valve 43 are opened, and the external pressure source interface of the second isolation valve 42 is closed. When cold overpressure protection needs to be executed after a certain system of the nuclear power plant fails, an operator in the main control room operates the first electromagnetic pilot valve 31 to open the normally closed first electromagnetic pilot valve 31, the pressure of a main valve cavity in the main valve 1 is discharged, the pressure of the main valve cavity is reduced, and the valve clack of the main valve 1 is automatically opened under the action of system medium force, so that the pressure in the system is discharged. When the operator closes the first electromagnetic pilot valve 31, the pressure in the main valve chamber in the main valve 1 rises and the main valve 1 flap closes under the influence of the medium force. The process realizes cold overpressure protection of the system by the pressure stabilizer pilot operated safety valve.
Cold overpressure protection requires manual intervention by an operator in the main control room.
3) Charging-discharging function
The main valve 1 and the first electromagnetic pilot valve 31 complete the charging-discharging function.
The working medium for the charge-discharge function is saturated steam. During the charging-discharging function, the spring type pilot valve 2 is closed, the second electromagnetic pilot valve 32 is opened, the first isolation valve 41, the second isolation valve 42 and the third isolation valve 43 are opened, and the external pressure source interface of the second isolation valve 42 is closed. When the nuclear power station needs to discharge the waste heat of the reactor core under a specific accident, an operator in the main control room operates the first electromagnetic pilot valve 31 to open the normally closed first electromagnetic pilot valve 31, the pressure of the main valve cavity in the main valve 1 is discharged, the pressure of the main valve cavity is reduced, and the valve clack of the main valve 1 is automatically opened under the action of the medium force of the system, so that the pressure in the system is discharged. When the operator closes the first electromagnetic pilot valve 31, the pressure in the main valve chamber in the main valve 1 rises and the main valve 1 flap closes under the influence of the medium force. The process realizes the charging-discharging function of the pressure stabilizer pilot operated safety valve to the system.
The charge-discharge function requires manual intervention by an operator in the main control room.
4) Pilot valve set pressure on-line check
The pilot safety valve of the nuclear power station voltage stabilizer is arranged on a system, and the on-line pressure setting check of the pilot valve can be realized without detaching the valve under the condition that the system pressure is lower than the setting pressure of the valve.
The online check of the pilot valve setting pressure is completed by the spring type pilot valve 2, the first isolation valve 41 and the second isolation valve 42.
When the pilot valve setting pressure is verified on line, the first isolation valve 41 and the second isolation valve 42 are closed, and the spring type pilot valve 2 is isolated from the main valve 1. An external pressure source port 422 of the second isolation valve 42 is opened and an online check of the pilot valve set pressure can be accomplished using the external pressure source.
5) Forced closing of main valve
In the thermal state overpressure protection process, if the spring type pilot valve 2 has an accident that the main valve cannot be closed due to the fact that the spring type pilot valve cannot return to the seat in time, an operator can manually switch on the power supply of the second electromagnetic pilot valve 32 in the main control chamber, and the second electromagnetic pilot valve 32 is closed to enable the main valve 1 to be forcibly closed.
6) Pressure display of main valve cavity
In order to display the pressure of the main cavity of the main valve 1 during the operation of the pressure stabilizer pilot operated safety valve, a third isolation valve 43 is arranged, the inlet of the third isolation valve 43 is connected with the main cavity of the main valve 1, and the outlet of the third isolation valve 43 is connected with a pressure display instrument 5.
The pilot safety valve of the nuclear power voltage stabilizer can be provided with all the functional modules or part of the functional modules.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (9)
1. A kind of nuclear power station stabiliser pilot operated relief valve, including main valve, spring pilot valve, first electromagnetic pilot valve, second electromagnetic pilot valve, first isolating valve, second isolating valve and third isolating valve, the said main valve has inlet of main valve and outlet of main valve, the said spring pilot valve has pressure induction port, pressure control port and exhaust outlet, characterized by that:
the pressure induction ports of the two groups of spring type pilot valves which are symmetrically arranged are respectively connected with the inlet of the main valve through the second isolation valve, the pressure control ports of the two groups of spring type pilot valves are respectively connected with the main valve cavity of the main valve through a second electromagnetic pilot valve and a first isolation valve which are sequentially connected, and the exhaust ports of the two groups of spring type pilot valves are connected with an exhaust pipeline;
the inlet of the first electromagnetic pilot valve is connected with the main valve cavity of the main valve, and the outlet of the first electromagnetic pilot valve is connected with a discharge pipeline;
and the inlet of the third isolating valve is connected with the main valve cavity of the main valve, and the outlet of the third isolating valve is connected with the pressure display instrument.
2. The pilot operated safety valve for a nuclear power plant regulator as claimed in claim 1, wherein said main valve is a pressure-loaded main valve, a main valve chamber is formed between the upper side of the main valve flap and the bonnet, and the opening and closing of the main valve flap is controlled by controlling the pressure in the main valve chamber.
3. The nuclear power plant regulator pilot operated safety valve of claim 1, wherein the spring loaded pilot valve is a pressure balanced spring loaded safety valve with bellows.
4. The nuclear power plant regulator pilot operated safety valve of claim 3, wherein the pressure balanced spring safety valve adds an electromagnetic drive.
5. The pilot operated safety valve for a nuclear power plant regulator of claim 3, wherein the pressure balanced spring operated safety valve is augmented with a pneumatic, electric, hydraulic or pneumatic-hydraulic drive.
6. The safety valve of claim 1, wherein the first electromagnetic pilot valve comprises two identical normally closed electromagnetic valves connected in series and is a normally closed valve.
7. The nuclear power plant regulator pilot operated safety valve as recited in claim 1, wherein the second electromagnetic pilot valve is a normally open valve.
8. The nuclear power plant regulator pilot operated safety valve of claim 1, wherein the first, second, and third isolation valves are manual shut-off valves.
9. The nuclear power plant regulator pilot operated safety valve as recited in claim 8, wherein the second isolation valve has a check valve built therein and an external pressure source port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010300174.5A CN111365502A (en) | 2020-04-16 | 2020-04-16 | Pilot-operated safety valve of voltage stabilizer of nuclear power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010300174.5A CN111365502A (en) | 2020-04-16 | 2020-04-16 | Pilot-operated safety valve of voltage stabilizer of nuclear power station |
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| CN111365502A true CN111365502A (en) | 2020-07-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010300174.5A Pending CN111365502A (en) | 2020-04-16 | 2020-04-16 | Pilot-operated safety valve of voltage stabilizer of nuclear power station |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116123325A (en) * | 2023-04-07 | 2023-05-16 | 福建福清核电有限公司 | Method for processing abnormal opening degree of thermal state pilot type safety valve |
-
2020
- 2020-04-16 CN CN202010300174.5A patent/CN111365502A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116123325A (en) * | 2023-04-07 | 2023-05-16 | 福建福清核电有限公司 | Method for processing abnormal opening degree of thermal state pilot type safety valve |
| CN116123325B (en) * | 2023-04-07 | 2023-10-20 | 福建福清核电有限公司 | Method for processing abnormal opening degree of thermal state pilot type safety valve |
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