JP2024511094A - Pressure reducing valve system and pressure reducing method - Google Patents

Abstract

A pressure reducing valve system and a pressure reducing method according to the present invention include a main hydraulic valve (1) and a trigger unit (4), the trigger unit (4) controls opening and closing of the main hydraulic valve (1), and a high pressure vessel ( 2) is allowed to flow into the low pressure container (3). The pressure reducing valve system and pressure reducing method do not require power drive, are hydraulically in the initial closed state, and open passively when receiving a signal trigger, simplifying the design and improving the safety of the reactor. It can significantly improve economic efficiency, quickly depressurize the high-pressure vessel, and fulfill the long-term emergency core cooling function. [Selection diagram] Figure 1

Description

This application claims priority to Chinese Patent Application No. 202110302346.7, filed on March 22, 2021, the title of the invention is "Safety Reducing Valve System", and all contents of the application are incorporated herein by reference. be incorporated into.

The present invention relates to the technical field of nuclear reactors, and in particular to a pressure reducing valve system and a pressure reducing method.

The development of small nuclear reactors (hereinafter referred to as "small reactors") that meet the needs of a variety of application situations is attracting a lot of attention both domestically and internationally, and the design of small reactors requires highly reliable accident mitigation measures. It is.

For small reactors, emergency core cooling systems are typically provided to mitigate design basis accidents. Due to the large pressure difference between the inside and outside of the reactor pressure vessel, it is first necessary to automatically depressurize the reactor pressure vessel, which enables long-term core cooling and avoids the occurrence of exposed core combustion. can. Decompression designs typically use nuclear-grade valves powered by a highly safe power source. However, such a system requires a highly safe power source and also requires a highly safe plant or increases the capacity of a highly safe plant, resulting in poor economics. , reliability decreases. Therefore, highly safe valves that do not require power-driven operation are particularly important.

In order to solve the above-mentioned problems, the present invention provides a highly safe valve that is based on an advanced passive design concept and that performs a nuclear reactor depressurization function under specific conditions without needing to be driven by a power source. .

The present invention provides a pressure reducing valve system. The pressure reducing valve system includes a main hydraulic valve and a trigger unit. The main hydraulic valve includes a first valve body, a first water inlet, and a first water outlet, the first water inlet being connected to the high pressure vessel and the first water outlet being connected to the low pressure vessel. and a main stopper is provided on the first valve body, the main stopper closing the first water inlet and the first water outlet and forming a sealed first hydraulic chamber with the first valve body. . The trigger unit includes a signal driver and a trigger actuator, and the trigger actuator is connected to the first hydraulic chamber. The trigger actuator can depressurize the first hydraulic chamber and cause the main stopper to release the closure of the first water inlet and the first water outlet when the signal driver receives the trigger signal; A liquid through flow path is formed between the water inlet and the first water outlet, allowing liquid in the high pressure container to flow into the low pressure container.

Preferably, the trigger actuator includes a trigger valve connected to the signal driver, the trigger valve having a second water inlet and a second water outlet, the second water inlet communicating with the first hydraulic chamber. and the second water outlet communicates with the low pressure container, and the trigger valve can be opened when the signal driver receives the trigger signal, and the liquid A through channel is formed, and the liquid in the first hydraulic chamber flows through the trigger valve into the low pressure container.

Preferably, the trigger actuator includes a threshold valve and a trigger valve connected to the signal driver, the trigger valve including a second water inlet and a second water outlet, the second water outlet being connected to a low pressure vessel. and the threshold valve includes a second valve body, a third water inlet and a third water outlet;
The third water inlet is connected to the first hydraulic chamber, the third water outlet is connected to the second water inlet, and a threshold stop is provided within the second valve body, the threshold stop being configured to The third water inlet and the third water outlet are closed to form a sealed second hydraulic chamber together with the second valve body, and the second hydraulic chamber is connected to the high pressure vessel.

Preferably, the threshold valve further includes a third resilient member, the third resilient member applying a third positive force on the threshold stopper, the third positive force applying a third positive force to the threshold stopper. a third negative force applied by the pressure chamber to the threshold stop, the third resilient member moving against the threshold stop when the pressure in the high pressure vessel decreases to a predetermined threshold; and causing the threshold stopper to unblock the third water inlet and the third water outlet, forming a liquid through flow path between the third water inlet and the third water outlet, and The liquid in the hydraulic pressure chamber is caused to flow into the low pressure container after passing through a threshold valve and a trigger valve.

Preferably, the main hydraulic valve further includes a first resilient member, the first resilient member applying a first positive force to the main stop, and the first positive force applying a first positive force to the main stop. in the opposite direction to the first negative force exerted by the hydraulic chamber on the main stop.

Preferably, a trigger stop is provided in the trigger valve, the trigger stop closes the second water inlet and the second water outlet, and the signal driver includes an electromagnetic device and a second resilient member; The second resilient member applies a second negative force to the trigger stopper, the electromagnetic device applies a second positive force to the trigger stopper in a direction opposite to the second negative force, and the electromagnetic device applies a second positive force to the trigger stopper. , the second positive direction force can be released when the signal receiving end receives the trigger signal, and the second elastic member is configured to release the second positive direction force when the electromagnetic device releases the second positive direction force; Press and move the trigger stopper to cause the trigger stopper to unblock the second water inlet and the second water outlet.

Preferably, the first hydraulic chamber is connected to the high pressure vessel by a fifth connection line, and the fifth connection line is provided with a buffer device.

Preferably, the buffer device is a venturi tube or orifice plate.

In addition, the present invention provides a method of reducing pressure. The pressure reduction method includes the following steps.

Step S1: Provide a main hydraulic valve with a first valve body between the high pressure vessel and the low pressure vessel, connect the high pressure vessel to the first water inlet of the main hydraulic valve, and connect the low pressure vessel to the first water inlet of the main hydraulic valve. Connect to water outlet.

Step S2: A main stopper is provided on the first valve body, and the main stopper closes the first water inlet and the first water outlet, forming a sealed first hydraulic chamber together with the first valve body. .

Step S3: Receive the depressurization trigger signal, depressurize the first hydraulic chamber, and the main stopper releases the closure for the first water inlet and the first water outlet, and the first water inlet and the first water A liquid through-flow path is formed between the outlets, allowing liquid from the high-pressure container to flow into the low-pressure container.

Preferably, step S3 includes the following steps.

Step S31: Provide a trigger valve, connect the low pressure container to the second water outlet of the trigger valve, and connect the first hydraulic chamber to the second water inlet of the trigger valve.

Step S32: Receive the pressure reduction trigger signal, open the trigger valve, and connect the second water inlet and the second
A liquid through-flow path is formed between the water outlets of the first liquid pressure chamber, and the liquid in the first liquid pressure chamber flows into the low pressure container after passing through the trigger valve.

Preferably, step S3 includes the following steps.

Step S33: Provide a trigger valve and connect a low pressure container to the second water outlet of the trigger valve.

Step S34: A threshold valve having a second valve body is provided between the trigger valve and the first hydraulic chamber, the first hydraulic chamber is connected to the third water inlet of the threshold valve, and the trigger valve is connected to the third water inlet of the threshold valve. Connect the second water inlet of the threshold valve to the third water outlet of the threshold valve.

Step S35: A threshold stopper is provided on the second valve body, and the threshold stopper closes the third water inlet and the third water outlet, forming a sealed second hydraulic chamber together with the second valve body. However, the second hydraulic chamber is connected to the high pressure vessel.

Step S36: Receive the pressure reduction trigger signal, open the trigger valve, and connect the second water inlet and the second
forming a through-flow path for liquid between the water outlets of the

Step S37: When the pressure in the high-pressure container decreases to a predetermined threshold, the threshold stopper releases the third water inlet and the third water outlet, and the threshold stopper releases the third water inlet and the third water outlet between the third water inlet and the third water outlet. A liquid passage is formed in the first hydraulic pressure chamber, and the liquid in the first hydraulic pressure chamber passes through the threshold valve and the trigger valve and flows into the low pressure container.

The pressure reducing valve system and pressure reducing method according to the present invention does not require power drive, is hydraulically in the initial closed state, and opens passively when receiving a signal trigger, simplifying the design and reducing the pressure in the reactor. It greatly improves safety and economy, allows the high-pressure vessel to be depressurized quickly, and can fulfill the long-term emergency core cooling function.

Note that the above description and the detailed explanation below are illustrative and do not limit the present invention.

In order to explain the present invention more clearly, the drawings used in the embodiments of the present application will be briefly described below. The drawings described below are only one embodiment of the present application, and those skilled in the art can obtain other embodiments based on the following drawings without creative effort.
FIG. 1 is a schematic diagram of a pressure reducing valve system according to a specific embodiment of the present invention. FIG. 2 is a schematic diagram of a pressure reducing valve system according to another specific embodiment of the present invention. FIG. 3 is a flowchart of a pressure reduction method according to a specific embodiment of the present invention.

100 Pressure reducing valve system 1 Main hydraulic valve 11 First valve body 12 First water inlet 13 First water outlet 14 Main stopper 15 First hydraulic chamber 16 First elastic member 4 Trigger unit 41 Signal driver 411 Electromagnetic device 412 Second elastic member 42 Trigger actuator 421 Trigger valve 422 Second water inlet 423 Second water outlet 424 Trigger stopper 43 Threshold valve 431 Second valve body 432 Third water inlet 433 Third water Inlet 434 Threshold stopper 435 Second hydraulic chamber 436 Third elastic member 51 First connection line 52 Second connection line 53 Third connection line 54 Fourth connection line 55 Fifth connection line 56 Buffer Device

The accompanying drawings are incorporated in and constitute a part of the specification, illustrate examples of the invention, and together with the specification serve to explain the invention.

Embodiments of the present invention will be described in detail below with reference to the drawings. It should be noted that the detailed description and drawings of the following examples are intended to illustrate the present invention, and the present invention is not limited to the following examples. Note that for convenience of explanation, only a part of the structure related to the present invention is shown in the drawings.

In addition, unless clearly explained below, the terms "connected," "connected," and "fixed" should be understood broadly, e.g., to mean fixed connections, removable connections, or integral connections. It may also be a mechanical connection or an electrical connection, a direct connection or an indirect connection via a medium, or communication between two parts or an interaction between two parts. Those skilled in the art may specify the meanings of the above terms in the present invention depending on the specific situation.

In the description of the present invention, unless otherwise specified, "above" or "below" a first member relative to a second member may be a direct connection between the first member and the second member, or The first member and the second member may be connected through another member instead of being directly connected. Also, the first member being “on top”, “above”, or “on top” of the second member means that the first member is directly above or diagonally above the second member, or It simply means that the first member is higher in horizontal height than the second member. The first member being “below,” “below,” or “on the underside” of the second member means that the first member is directly below and diagonally below the second member, or simply that the first member is means that the member is lower in horizontal height than the second member.

In the description of the embodiments of the present invention, the directions and positional relationships indicated by terms such as "top", "bottom", "left", "right", etc. are the directions and positional relationships shown based on the drawings. It is used as a matter of convenience and is not intended to imply that the devices or components have a particular orientation, be constructed or operate in a particular orientation, and is not intended to limit the present application. Also, the terms "first" and "second" are used for explanation only and have no special meaning.

The present invention uses advanced passive design concepts to provide a highly safe valve design that does not require power drive and satisfies the depressurization function of a nuclear reactor under certain conditions.

FIG. 1 is a schematic diagram of a pressure reducing valve system according to a specific embodiment of the present invention.

As shown in FIG. 1, the pressure reducing valve system 100 includes a main hydraulic valve 1 and a trigger unit 4.

The main hydraulic valve 1 includes a first valve body 11, a first water inlet 12 and a first water outlet 13 provided in the first valve body 11, and the first water inlet 12 is connected to a high pressure container. 2, the first water outlet 13
is connected to the low pressure vessel 3. The first valve body 11 is provided with a main stopper 14, the main stopper 14 is movable within the first valve body 11, and the main stopper 14 closes the first water inlet 12 and the first water outlet 13. Together with the first valve body 11, a sealed first hydraulic pressure chamber 15 is formed.

The trigger unit 4 includes a signal driver 41 and a trigger actuator 42. A trigger actuator 42 is connected to the first hydraulic chamber 15, and the trigger actuator 42 reduces the pressure in the first hydraulic chamber 15 when the signal driver 41 receives the trigger signal, and causes the main stopper 14 to enter the first hydraulic pressure chamber 15. The water inlet 12 and the first water outlet 13 can be unblocked, and a liquid through-flow path is formed between the first water inlet 12 and the first water outlet 13, and the flow from the high-pressure container 2 Liquid flows into the low pressure vessel 3.

In this embodiment, the first hydraulic chamber 15 of the main hydraulic valve 1 is connected to the trigger actuator 42, the signal driver 41 receives the trigger signal to open the main hydraulic valve 1, and the valve opening signal is satisfied. When the signal driver 41 drives the trigger actuator 42 to open the valve, the liquid in the first hydraulic pressure chamber 15 flows into the trigger actuator 42, and the hydraulic pressure in the first hydraulic pressure chamber 15 is reduced. The main stopper 14 is moved in the direction of the first hydraulic chamber 15.

In FIG. 1, the direction of the arrow attached to each pipeline indicates the fluid flow direction, and the solid line inside the first valve body 11 indicates that the main stopper 14 connects the first water inlet 12 and the first water outlet 13. Indicates a closed state. When the hydraulic pressure in the first hydraulic chamber 15 decreases and the main stopper 14 moves a sufficient distance in the direction of the first hydraulic chamber 15, the main stopper 14 connects the first water inlet 12 and the first The water outlet 13 is unblocked. In FIG. 1, the dotted line inside the first valve body 11 indicates that the main stopper 14 moves, releases the closed state of the first water inlet 12 and the first water outlet 13, and opens the main hydraulic valve 1. A liquid through-flow path is formed between the first water inlet 12 and the first water outlet 13, allowing the liquid from the high-pressure container 2 to flow into the low-pressure container 3, and reducing the pressure from the high-pressure container 2 to the low-pressure container 3. is realized.

The pressure reducing valve system 100 of this embodiment does not require driving by a power source, is initially closed by hydraulic pressure, and opens the valve passively when a trigger signal is received, simplifying the design and The safety and economical efficiency of the system can be greatly improved, the high pressure vessel 2 can be depressurized quickly, and emergency core cooling can be performed for a long period of time.

Please continue to refer to FIG. In one embodiment, the trigger actuator 42 comprises a trigger valve 421 connected to the signal driver 41, the trigger valve 421 being connected to the second water inlet 4.
22 and a second water outlet 423, the second water inlet 422 is connected to the first hydraulic pressure chamber 15,
The second water outlet 423 is connected to the low pressure container 3, and the trigger valve 421 is connected to the signal driver 41.
can open when receiving a trigger signal, forming a liquid through flow path between the second water inlet 422 and the second water outlet 423, so that the liquid in the first hydraulic chamber 15 It flows into the low pressure vessel 3 through the trigger valve 421.

In this embodiment, the first hydraulic chamber 15 of the main hydraulic valve 1 is connected to the second water inlet 422 of the trigger valve 421 via a first connecting line 51 . The signal driver 41 receives a trigger signal that opens the main hydraulic valve 1, and when the valve opening signal is satisfied, the signal driver 41 drives the trigger valve 421 to open the valve, thereby increasing the first hydraulic pressure. the liquid in the chamber 15 flows through the first connection line 51 and into the trigger valve 421 through the second water inlet 422;
Water flows into the low pressure container 3 through the second water outlet 423, thereby reducing the hydraulic pressure in the first hydraulic chamber 15 and moving the main stopper 14 in the direction of the first hydraulic chamber 15.

In one embodiment, the main hydraulic valve 1 further comprises a first resilient member 16, which applies a first positive force F1 to the main stop 14 and increases the first hydraulic pressure. The hydraulic pressure in the chamber 15 applies a first negative force F2 to the main stop 14, and the first positive force F1 is the first negative force F1 applied by the first hydraulic chamber 15 to the main stop 14. The force F2 is in the opposite direction. As an example, the first positive force F1 is applied vertically to the end face of the main stop 14, and the main stop 14 has a first hydraulic chamber in the first valve body 11 of the main hydraulic valve 1. It can move in 15 directions.

In the initial state, the first negative force F2 is greater than or equal to the first positive force F1. Thereby, the main stop 14 is kept closed with respect to the first water inlet 12 and the first water outlet 13, i.e. the main stop 14 is in the disconnected position and the first water inlet of the main hydraulic valve 1 12 and the first water outlet 13 is stopped.

When the valve opening signal is satisfied, the signal driver 41 drives the trigger valve 421 to open the valve, and the liquid in the first hydraulic chamber 15 flows through the first connection line 51 and from the second water inlet 422. It flows to the trigger valve 421 and then from the second water outlet 423 to the low pressure container 3, reducing the hydraulic pressure in the first hydraulic chamber 15 and reducing the first negative force F2. The first negative force F2 is the first
, the main stopper 14 is acted upon by the first positive force F1 by the first elastic member 16 and moves in the direction of the first hydraulic chamber 15, i.e. , main stopper 14
leaves the cutting position, the liquid flow between the first water inlet 12 and the first water outlet 13 of the main hydraulic valve 1 penetrates, the main hydraulic valve 1 opens passively and automatically; Liquid from high pressure vessel 2 flows into low pressure vessel 3.

In one embodiment, a trigger stopper 424 is provided within the trigger valve 421, and the trigger stopper 424 closes the second water inlet 422 and the second water outlet 423. The signal driver 41 includes a signal receiving end (not shown), an electromagnetic device 411, and a second elastic member 412, and the second elastic member 412 applies a second negative force F3 to the trigger stopper 424. , the electromagnetic device 411 applies a second positive force F4 to the trigger stopper 424 in a direction opposite to the second negative force F3, and the electromagnetic device 411 receives the trigger signal at the signal receiving end. When the electromagnetic device 411 releases the second positive force F4, the second resilient member 412 releases the trigger stopper 424 when the electromagnetic device 411 releases the second positive force F4. Push and move the trigger stopper 4
24 to unblock the second water inlet 422 and the second water outlet 423.

In the initial state, the second positive force F4 is greater than or equal to the second negative force F3, and the initial position of the trigger stopper 424 is between the second water inlet 422 and the second water outlet 423 of the trigger valve 421. between the second water inlet 422 and the second water outlet 423, that is, when the trigger stopper 424 is in the cut position, the second water inlet 422 and the second water outlet 423 of the trigger valve 421 remain closed. The flow of liquid to and from the second water outlet 423 is stopped.

The signal receiving end receives the trigger signal, and when the valve opening signal is met, the signal receiving end sends a power off signal to the electromagnetic device 411, turns off the power of the coil of the electromagnetic device 411, and generates a second positive direction force. F4 is removed, the trigger stopper 424 is acted upon by a second negative force F3, moves away from its initial position, and stops the flow of liquid between the second water inlet 422 and the second water outlet 423 of the trigger valve 421. Penetrate.

FIG. 2 is a schematic diagram of a pressure reducing valve system according to another embodiment of the present invention.

As shown in FIG. 2, in another embodiment, the trigger actuator 42 comprises a threshold valve 43 and a trigger valve 421 connected to the signal driver 41, the trigger valve 421 having a second water inlet 422 and a second water inlet 422. and a second water outlet 423, the second water outlet 423 being connected to the low pressure vessel 3. The threshold valve 43 includes a second valve body 431, a third water inlet 432, and a third water outlet 433, the third water inlet 432 is connected to the first hydraulic chamber 15, and the third water inlet 432 is connected to the first hydraulic pressure chamber 15. 3 water outlet 433
is connected to the second water inlet 422, and a threshold stopper 434 is provided within the second valve body 431. A threshold stopper 434 is movable within the second valve body 431 , and the threshold stopper 434 closes the third water inlet 432 and the third water outlet 433 and provides a sealed third water outlet with the second valve body 431 . 2 hydraulic pressure chambers 435 are formed, and the second hydraulic pressure chamber 435 is connected to the high pressure container 2 .

Please continue to refer to FIG. 2. The first hydraulic chamber 15 of the main hydraulic valve 1 is connected to the third water inlet 432 of the threshold valve 43 via a second connecting line 52 . The third water outlet 433 of the threshold valve 43 is connected to the second water inlet 422 of the trigger valve 421 via a third connection line 53. The signal driver 41 receives a trigger signal to open the main hydraulic valve 1, and when the valve opening signal is satisfied, the signal receiving end sends a power off signal to the electromagnetic device 411 to turn off the power of the coil of the electromagnetic device 411. , the second positive force F4 disappears, the trigger stopper 424 moves away from the initial position under the action of the second negative force F3, and the second water inlet 422 and second water outlet 423 of the trigger valve 421 Permeate the flow of liquid between. The second hydraulic chamber 435 is connected to the high pressure vessel 2 via the fourth connection line 54, so that the second hydraulic chamber 435 has the same pressure as the high pressure vessel 2. When the pressure in the high-pressure container 2 drops to the set threshold, the threshold stopper 434 moves toward the second hydraulic pressure chamber 435, and the threshold stopper 434 has a third water inlet 432 and a third water outlet 433. The closure of the threshold valve 43 is thereby realized, and a penetrating liquid flow path is formed between the third water inlet 432 and the third water outlet 433, and the first liquid pressure chamber is opened. 15 liquid flows via the second connection line 52 to the third water inlet 432, enters the threshold valve 43 and passes through the third water outlet 433 via the third connection line 53 to the already opened liquid. After flowing into the opened trigger valve 421, it flows into the low pressure container 3 via the trigger valve 421.

In this embodiment, the threshold valve 43 is connected to the high pressure vessel 2, and when the signal driver 41 receives a trigger signal, the trigger valve 421 opens. After the trigger valve 421 opens, when the pressure in the high-pressure vessel 2 drops to the set threshold, the threshold valve 43 opens, the pressure reduction in the first hydraulic chamber 15 of the main hydraulic valve 1 is completed, and the high-pressure vessel 2 and low pressure vessel 3 can be connected,
Depressurization of the high pressure vessel is achieved.

The pressure reducing valve system 100 of this embodiment can prevent a malfunction even if the trigger valve 421 opens by mistake, and prevents the main hydraulic valve 1 from opening immediately and reduces the pressure inside the high pressure vessel 2. The main hydraulic valve 1 opens only when the value also satisfies the opening condition, thereby maintaining the integrity of the pressure boundary of the high-pressure vessel 2 and reducing the number of unscheduled reactor shutdowns and the occurrence of primary events. The probability can be reduced.

In one embodiment, the threshold valve 43 further includes a third resilient member 436, which applies a third positive force F5 to the threshold stop 434, and the third resilient member 436 applies a third positive force F5 to the threshold stop 434. F5 is in the opposite direction to the third negative force F6 applied by the second hydraulic pressure chamber 435 to the threshold stopper 434, and the third elastic member 436 is When the threshold value has been lowered, the threshold stopper 434 can be pushed and moved, which causes the threshold stopper 434 to unblock the third water inlet 432 and the third water outlet 433 and close the third water inlet 432. A liquid through-flow path is formed between the third water outlet 433 and the third water outlet 433, and the liquid in the first hydraulic pressure chamber 15 is transferred to the threshold valve 43.
and flows into the low pressure container 3 through the trigger valve 421.

In the initial state, the third negative force F6 is greater than or equal to the third positive force F5, so that the threshold stopper 434 is closed to the third water inlet 432 and the third water outlet 433. , that is, the threshold stopper 434 is in the disconnected position, stopping the flow of liquid between the third water inlet 432 and the third water outlet 433 of the threshold valve 43 .

When the pressure in the high-pressure container 2 decreases to the set threshold, the third negative force F6 becomes smaller than the third positive force F5, and the threshold stopper 434 stops the third positive force F5. is moved in the direction of the second hydraulic chamber 435, i.e. the threshold stopper 434 leaves the cutting position and moves between the third water inlet 432 and the third water outlet 433 of the threshold valve 43. The liquid flows through the first hydraulic pressure chamber 15 and causes the liquid in the first hydraulic pressure chamber 15 to flow into the threshold valve 43 .

In one embodiment, the first hydraulic chamber 15 is connected to the high-pressure vessel 2 via a fifth connection line 55. The high-pressure vessel 2 applies pressure to the first hydraulic chamber 15, thereby causing a first negative force F
2 maintains the main stop 14 in its initial closed condition. A buffer device 56 is provided in the fifth connection line 55, and the buffer device 56 buffers the release of mass and energy due to the ejection of liquid flow between the high pressure container 2 and the first hydraulic chamber 15, and 3 integrity can be maintained.

In one example, buffer device 56 is a Venturi tube or a hole plate. The venturi tube or hole plate can reduce the line size of the fifth connection line 55, thus reducing the mass, energy release due to jetting of liquid flow and maintaining the integrity of the low pressure vessel 3. Can be done.

FIG. 3 is a flowchart of a pressure reduction method according to an embodiment of the present invention.

As shown in FIG. 3, the pressure reduction method of the present application includes the following steps.

Step S1: Provide a main hydraulic valve 1 having a first valve body 11 between the high pressure vessel 3 and the low pressure vessel 2, connect the high pressure vessel 2 to the first water inlet 12 of the main hydraulic valve 1, and connect the high pressure vessel 2 to the first water inlet 12 of the main hydraulic valve 1. 3 to the first water outlet 13 of the main hydraulic valve 1.

Step S2: A main stopper 14 is provided on the first valve body 11, the main stopper 14 closes the first water inlet 12 and the first water outlet 13, and the first valve body 11 is sealed together with the first water outlet 13. Hydraulic pressure chamber 15
form.

Step S3: Receive the pressure reduction trigger signal, reduce the pressure in the first hydraulic chamber 15, and release the main stopper 14 from blocking the first water inlet 12 and the first water outlet 13, and the first water inlet 12 A penetrating liquid flow path is formed between the first water outlet 13 and the first water outlet 13, and the liquid from the high pressure vessel 2 flows into the low pressure vessel 3.

As an example, step S3 includes the following steps.

Step S31: Provide a trigger valve 421, connect the low pressure container 3 to the second water outlet 423 of the trigger valve 421, and connect the first hydraulic chamber 15 to the second water inlet 422 of the trigger valve 421.

Step S32: Receive the pressure reduction trigger signal, open the trigger valve 421, and open the second water inlet 4.
22 and the second water outlet 423 , a penetrating liquid flow path is formed, and the liquid in the first hydraulic pressure chamber 15 flows into the low pressure container 3 through the trigger valve 421 .

As an example, step S3 includes the following steps.

Step S33: Provide the trigger valve 421 and connect the low pressure container 3 to the second water outlet 423 of the trigger valve 421.

Step S34: A second valve body 435 is inserted between the trigger valve 421 and the first hydraulic chamber 15.
A threshold valve 43 is provided, which connects the first hydraulic chamber 15 to the third water inlet 432 of the threshold valve 43 and connects the second water inlet 422 of the trigger valve 421 to the third water outlet of the threshold valve 43. Connect to 433.

Step S35: A threshold stopper 434 is provided on the second valve body 431, and the threshold stopper 434 closes the third water inlet 432 and the third water outlet 433, and the second valve body 431 and the second valve body 431 are sealed together. A second hydraulic pressure chamber 435 is formed, and a second hydraulic pressure chamber 435 is connected to the high pressure vessel 2.

Step S36: Receive the pressure reduction trigger signal, open the trigger valve 421, and form a liquid through flow path between the second water inlet 422 and the second water outlet 423.

Step S37: When the pressure of the high-pressure container 2 decreases to the set threshold, the threshold stopper 434 releases the third water inlet 432 and the third water outlet 433, and the third water inlet 432 and the third water outlet 433 are closed. A liquid passage is formed between the three water outlets 433, and the liquid in the first hydraulic pressure chamber 15 flows into the low pressure container 3 through the threshold valve 43 and the trigger valve 421.

The pressure reducing valve system and pressure reducing method according to the present invention do not require driving by a highly safe power source, and when a signal setting value is reached, the valve automatically opens, and the internal pressure and external pressure of the high-pressure container and the low-pressure container are reduced. Achieving balance, meeting the needs of automatic depressurization, and providing appropriate conditions for nuclear reactor-specific system injection. In addition, in order to prevent malfunction, signal judgment + threshold value judgment is performed.Compared to the conventional technology, the present invention is in a closed state due to hydraulic pressure as an initial state, and when a signal trigger is met, it is passively opened by a spring. It does not require a power source and is extremely safe. To prevent erroneous operation, the pressure reducing valve is equipped with a threshold function to protect the integrity of the high pressure vessel boundary.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments. Various embodiments that fall within the technical idea of the present invention fall within the protection scope of the present invention. Those skilled in the art will appreciate that changes or modifications made to the above embodiments without departing from the technical idea of the present invention fall within the protection scope of the present invention.

Claims (11)

A main hydraulic valve including a first valve body, a first water inlet, and a first water outlet, the first water inlet being connected to a high pressure vessel and the first water outlet being connected to a low pressure vessel. a main stopper connected to the container and provided on the first valve body, the main stopper closing the first water inlet and the first water outlet, and a first valve body sealed together with the first valve body; a main hydraulic valve forming a hydraulic chamber of 1;
a signal driver and a trigger actuator, the trigger actuator being the first
a trigger unit connected to the hydraulic pressure chamber of the
Equipped with
The trigger actuator is configured to reduce pressure in the first hydraulic chamber and cause the main stopper to unblock the first water inlet and the first water outlet when the signal driver receives a trigger signal. A pressure reducing valve system, wherein a liquid passage is formed between the first water inlet and the first water outlet, and the liquid in the high pressure container flows into the low pressure container. The trigger actuator includes a trigger valve connected to the signal driver, the trigger valve having a second water inlet and a second water outlet, the second water inlet being connected to the first hydraulic chamber. the second water outlet communicates with the low pressure vessel, the trigger valve is operable to open when the signal driver receives a trigger signal, and the second water inlet and the second water outlet communicate with the low pressure vessel; The pressure reducing valve according to claim 1, wherein a liquid through flow path is formed between the water outlet and the first liquid pressure chamber, and the liquid in the first liquid pressure chamber flows into the low pressure container through the trigger valve. system. the trigger actuator includes a threshold valve and a trigger valve connected to the signal driver;
the trigger valve includes a second water inlet and a second water outlet, the second water outlet being connected to the low pressure container;
The threshold valve includes a second valve body, a third water inlet and a third water outlet, the third water inlet is connected to the first hydraulic chamber, and the third water outlet is connected to the first hydraulic pressure chamber. A threshold stop is provided in the second valve body connected to the second water inlet, the threshold stop closing the third water inlet and the third water outlet, and closing the third water inlet and the third water outlet. 2. The pressure reducing valve system according to claim 1, wherein a sealed second hydraulic chamber is formed with two valve bodies, and the second hydraulic chamber is connected to the high pressure vessel. The threshold valve further includes a third resilient member, the third resilient member applying a third positive force to the threshold stop, and the third positive force applying a third positive force to the threshold stop. in a direction opposite to a third negative force applied to the threshold stopper by a hydraulic chamber of the third resilient member, the third resilient member is configured to: The threshold stop can be pushed and moved, causing the threshold stop to unblock the third water inlet and the third water outlet, and between the third water inlet and the third water outlet. 4. The reduced pressure according to claim 3, wherein a liquid through-flow path is formed, and the liquid in the first liquid pressure chamber is caused to flow into the low pressure container after passing through the threshold value valve and the trigger valve. valve system. The main hydraulic valve further includes a first resilient member, the first resilient member applying a first positive force to the main stopper, and the first positive force applying a first positive force to the main stopper. A pressure reducing valve system according to any one of claims 1 to 4, characterized in that the first hydraulic chamber is in a direction opposite to the first negative force applied to the main stop. A trigger stopper is provided in the trigger valve, the trigger stopper closes the second water inlet and the second water outlet, and the signal driver includes a signal receiving end, an electromagnetic device, and a second water outlet.
a resilient member, the second resilient member applying a second negative force to the trigger stop, and the electromagnetic device applying a second negative force to the trigger stop in a direction opposite to the second negative force. applying a second positive force to the second elastic member, the electromagnetic device being able to release the second positive force when receiving a trigger signal at the signal receiving end; , the electromagnetic device is connected to the second
3. When releasing the positive force, the trigger stopper can be pushed and moved to cause the trigger stopper to release the closure of the second water inlet and the second water outlet. 5. The pressure reducing valve system according to any one of 2 to 4. The first hydraulic pressure chamber is connected to the high pressure container by a fifth connection line, and the fifth connection line is provided with a buffer device. Pressure reducing valve system. The pressure reducing valve system according to claim 7, wherein the buffer device is a venturi tube or an orifice plate. A main hydraulic valve having a first valve body is provided between a high pressure vessel and a low pressure vessel, the high pressure vessel is connected to a first water inlet of the main hydraulic valve, and the low pressure vessel is connected to the first water inlet of the main hydraulic valve. Step S1 of connecting to the water outlet of the
A main stopper is provided on the first valve body, and the main stopper closes the first water inlet and the first water outlet, and defines a first hydraulic chamber sealed together with the first valve body. Forming step S2
and,
receiving a depressurization trigger signal and depressurizing the first hydraulic chamber; the main stopper releases the closure for the first water inlet and the first water outlet; Step S3: forming a liquid through-flow path between the water outlets of the first water outlet and causing the liquid from the high-pressure container to flow into the low-pressure container;
A decompression method characterized by comprising: Step S3 includes providing a trigger valve, connecting the low pressure container to a second water outlet of the trigger valve, and connecting the first hydraulic chamber to a second water inlet of the trigger valve;
receiving a pressure reduction trigger signal and opening the trigger valve, forming a liquid through flow path between the second water inlet and the second water outlet, and causing the liquid in the first hydraulic pressure chamber to step S32 of flowing into the low pressure container after passing through the trigger valve;
The pressure reduction method according to claim 9, comprising: The step S3 includes step S33 of providing a trigger valve and connecting the low pressure container to a second water outlet of the trigger valve;
a threshold valve having a second valve body is provided between the trigger valve and the first hydraulic chamber, connecting the first hydraulic chamber to a third water inlet of the threshold valve; connecting a second water inlet of the trigger valve to a third water outlet of the threshold valve;
A threshold stopper is provided on the second valve body, the threshold stopper closing the third water inlet and the third water outlet, and forming a second hydraulic chamber sealed together with the second valve body. forming a step S35, and the second hydraulic chamber is connected to the high pressure container;
step S36 of receiving a pressure reduction trigger signal and opening the trigger valve to form a liquid through flow path between the second water inlet and the second water outlet;
When the pressure in the high-pressure container decreases to a predetermined threshold, the threshold stopper releases the third water inlet and the third water outlet, and the third water inlet and the third water outlet are closed. A step S37 of forming a liquid through-flow path between the outlets and causing the liquid in the first hydraulic pressure chamber to flow into the low-pressure container through the threshold valve and the trigger valve. The pressure reduction method according to claim 9.