JPS5965678A - Separating valve with function of swirl stop valve for measuring line - Google Patents

Abstract

PURPOSE:To permit automatic remote control resetting while saving a spece by mounting on a detecting piping a separating valve with function of a swirl stopping valve formed integrally with an electromagnetic sluice valve portion and a swirl stopping valve portion. CONSTITUTION:A separating valve 68 with function of a swirl stopping valve integrating a swirl stopping valve portion 41 and an electronic slucice valve portion 50 and affording communication between both portions through a pressure balancing hole 66 is mounted in a detecting piping 3. Thus, a series of operations are all automatically carried out in a central operation chamber so that manual operations in positions near a penetration portion 4 which are crowded with apparatus to provide bad operability are dispensed with. Also, the separating valve 68 with function of the swirl stopping valve can be made compact so that a space can be saved.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to isolation valves for measurement lines, and in particular to overflow prevention valves for measurement lines suitable for installation in high-pressure measurement lines that penetrate a nuclear reactor containment vessel. Regarding functional isolation valves.

[Prior art]

Nuclear power plants are equipped with various measuring instruments in order to understand their operating status.

In a BWR nuclear power plant, one type of such instrumentation equipment is a pressure measuring instrument. This pressure measurement is carried out by attaching one end of the detection piping to the reactor pressure vessel, main steam piping, water supply piping, and other auxiliary system piping, and attaching a pressure detection needle to the other end of the detection piping. .

FIG. 1 shows an example of a conventional pressure detection piping system. A detection pipe 3 is attached to a reactor pressure vessel 2 installed in the containment vessel 1, and the detection pipe 3 is guided to the outside of the containment vessel 1 through a penetration portion 4 installed in the containment vessel 1. An isolation valve 5 and an overflow prevention valve 6 are interposed near the exit of the penetration part 4 of the detection pipe 3, so that the instrument side can be isolated from the reactor side. An operating stand 7 is provided near where the isolation valve 5 and overflow prevention valve 6 are installed, to ensure a space for manual operation in the event of an accident. The detection pipe 3 exiting the excessive flow prevention valve 6 section is connected to a meter 9 via an instrumentation valve 8 . The purpose of installing the overflow prevention valve 6 is to prevent the leakage of radioactive secondary coolant in case of an accident such as a rupture of the detection pipe 3 after the prevention valve or damage to the instrumentation valve 8 and instrument 9. This is to do so. Therefore, the overflow check valve 6 is normally open and automatically closes when equipment after the check valve leaks, and the opening/closing status is required to be displayed in the central control room. . Approximately 100 such detection pipes are provided in one BWR atomic couplant, and a large number of these detection pipes must be installed in a limited space. Figure 2 is the first
This is a sectional view of the penetrating part 4 in the figure, and in this example, six detection pipes 3 are bundled and passed through the penetrating part 4.

Figures 3 to 5 are detailed views of the vicinity of the penetration part 4 in Figure 1;
As many as 12 isolation valves 5 and overflow prevention valves 6 are installed in a limited space, and wiring 10 and the like are also arranged, resulting in a very crowded space. Moreover, there are process piping,
Trays, ducts, etc. are installed, and it is a place where various equipment is crowded.

For this reason, in order to satisfy the technical standards (manual valves that can be easily operated in the event of an accident), an operating stand 7 has been installed, but securing the space for this operating stand 7 requires a difficult design. This is a planning issue. In addition, support materials and electrical conduits supporting the isolation valve 5 and overflow prevention valve 6 are also required in this area, and as shown in Figure 3, the arrangement of each device is complicated and the installation work is extremely difficult. becomes.

FIG. 6 is a sectional view showing an example of the structure of a conventional excessive flow prevention valve 6. As shown in FIG. A flow path 12 is formed inside the valve body 11, and an inlet portion 12A is formed on the upstream side of the flow path 12, an outlet portion 12B is formed on the downstream side, and a narrow portion 1 is formed near the outlet portion 12B.
2 C are formed respectively. An annular locking member 13 is fixed inside the sweet valve body, and a ring-shaped locking member 13 is provided between the locking member 13 and the narrow portion 12C in the flow path 12, facing the narrow portion 12C. The poppet 14, which has a valve body 14A at its tip and is formed of a magnet, is a compression spring 15.
It is pushed to the left in the figure and is locked by the locking member 13. Further, a concave notch 14C is formed in the sliding surface 14B of the poppet 14 as shown in FIG.
2B.

Further, a reed switch 16 is provided outside the valve body 11 and in a position close to the poppet 14, and a terminal of the reed switch 16 is connected to an external circuit, so that the open/closed state of the overflow prevention valve is determined by the external circuit. It is configured so that it is sent as on/off information. Further, in the vicinity of the narrow portion 12C of the valve body 11, passages 17A and 17B are provided that communicate the narrow portion 12C with the upstream side of the flow path 12.

- A reset valve 18 for opening and closing the passage 17B is provided outside the valve body 11 above the narrow portion 12C. This reset valve 18ij: housing 19,
It is provided in the housing 19 and has a valve body portion 2O at its tip.
It is composed of a rod 20 having a shape A' and a nozzle 21 connected to the rod 20. In the above configuration, in a normal state, that is, in a state where the differential pressure between the upstream side and the downstream side of the upstream excessive flow prevention valve is zero, the poppet 14 is pressed to the left in the figure by the compression spring 15 as described, The overflow prevention valve is in an open state. If the downstream pipes, valves, and instruments connected to the overflow prevention valve are damaged and the process fluid is sent out, the pressure downstream of the overflow prevention valve will change dramatically. The poppet 14 moves to the right in the figure due to the differential pressure, and the excessive flow prevention valve closes. In addition, when the activated overflow check valve is reset, the engagement between the passage 17B and the valve body 20A is released by operating the handle 21, and the pressure between the upstream and downstream is balanced, thereby preventing the overflow. A reset operation of the check valve is performed. In this case, it is necessary to operate the isolation valve 5 at L7 as a step before the reset operation.

In a device that uses such conventional isolation valves 5 and overflow prevention valves 6, when resetting the overflow prevention valve 6, the isolation valve 5
must be manually operated, but as mentioned above, the areas around the overflow prevention valve 6 and isolation valve 5 are crowded with equipment and there is not enough space, so it may be difficult to perform quick manual operation. Therefore, attempts have been made to reduce the space required by the overflow prevention valve and the isolation valve to secure space for the four through holes. FIGS. 8 and 9 show Japanese Patent Application No. 55-134295, which is an example of such an attempt. A valve chamber 24 is provided in the middle of a flow path 23 provided inside the valve body 22 .

A poppet 25 having a valve portion 25A is built in the valve chamber 24 on the downstream side thereof, and the poppet 25 is normally pressed toward the upstream side by a compression spring 26. It is pressed into contact with 24A. and the valve body 22
A reed switch 27 is provided on the outside of the reed switch 27 and is turned on and off by movement of a poppet 25 formed of a magnet.The reed switch 27 is connected to an external circuit via a terminal 28. In addition, as mentioned above, the valve chamber 2
4. An excessive flow prevention valve portion 29 is formed on the poppet 25 and the compression spring 26.

On the other hand, a gate valve part 30 is provided on the downstream side of the flow path 23, and the gate valve part 30 is connected to a ball valve 31 provided in the flow path 23.
and a valve rod 32 connected to the ball valve 31; and a valve rod 32 connected to the ball valve 31.
It consists of a housing 33 that surrounds the valve stem 32, and a handle 34 that is fixed to the upper end of the valve stem 32.

Further, the ball valve 31 has a through hole 37 bored in a plane including the flow path 23, and a pressure balance hole 3 penetrating from the inner peripheral wall of the through hole 37 to the outer peripheral wall of the ball valve 31.
8 is drilled.

Further, the ball valve 31 is provided between the valve chamber 24 in the valve body 22 and the flow path 23 in which the ball valve 31 is disposed.
A flow path 39 that can communicate with the pressure balance hole 38 is provided. Further, a pointer 36 is attached to a fixed portion between the handle 34 and the valve stem 32, and a position indicating plate 35 is provided on the housing 33 opposite to the pointer 36.
is provided. Furthermore, a locking mechanism 40 is provided on the housing 33 for fixing the handle 34 in a desired position.
is provided.

In the isolation valve having such a structure, the ball valve 31 is in a position as shown in FIGS. 8 and 9 in a normal state, that is, in an open state. If a breakage accident occurs on the downstream side of the isolation valve for the measurement line and a pressure difference occurs between the upstream and downstream sides, the poppet 25 of the overflow prevention valve section 29 will move toward the right in the figure due to the pressure difference. When pressed, the valve body part 25A blocks the flow path 23 and becomes closed, but in order to maintain a double closed structure based on the principle of isolation valves based on technical standards, the handle 34
The gate valve section 30 is operated by the operation, and the ball valve 31 is closed. In this state, downstream maintenance, inspection, and repair can be performed. Next, when returning from the closed state to the normal state, the pressure balance hole 38 drilled in the ball valve 31 is aligned with the passage 39 provided in the valve body 22 (9). The position of the ball valve 31 is such that the ball valve 31 is in an intermediate opening state, and the pressure upstream and downstream of the poppet 25 is in a closed state, so the excessive flow prevention valve part 29 is opened by the compression spring 26. state, and the reset operation is complete.

According to this known example, these series of operations are performed by the handle 3.
This operation can be easily performed by only operating step 4, and there is no need to operate the isolation valve 5 and overflow prevention valve 6 independently in a state with poor operability as in the previous example. Furthermore, since the overflow prevention valve and the isolation valve are integrated, there are advantages such as significantly improved space efficiency compared to the conventional configuration in which each valve is used separately. However, this known example also has the disadvantage that manual operation is still required to reset the overflow prevention valve section.

[Purpose of the invention]

An object of the present invention is to eliminate the above-mentioned drawbacks and provide an isolation valve with an overflow prevention valve function for a measurement line that can be automatically reset by remote control and saves space.

[Summary of the invention]

The present invention includes an overflow prevention valve that closes a flow path when a pressure difference of a predetermined value or more occurs between upstream and downstream, and an overflow prevention valve that is connected downstream of the overflow prevention valve and that moves forward by electromagnetic force to prevent flow. By integrally forming the gate valve section that opens and closes the passage, and closing the gate valve section after the excessive flow prevention valve section is closed, the pressure balance between the upstream and downstream of the excessive flow prevention valve section can be maintained. By providing a mechanism in which the excessive flow prevention valve section is reset in a balanced manner,
Achieve the above objectives.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 10 is a sectional view showing an embodiment of the isolation valve with overflow prevention valve function for a measurement line according to the present invention.

In this embodiment, an overflow prevention valve section 41 and an electromagnetic gate valve section 42 are used.
It consists of an integrally formed piece. A flow path 42 is formed inside the excessive flow prevention valve section 41, and a valve chamber 43 is provided in the middle of the flow path 42. A poppet 44 having a valve body portion 44A (11) is built into the valve chamber 43 on its downstream side.
4 is normally pressed upstream by a compression spring 45,
It is pressed against the end of the valve chamber 43. In addition, the poppet 44
The narrow portion 46f of the rainbow valve chamber 43 is closed due to the pressure difference between the upper and downstream sides, and the excessive flow prevention valve portion 41 is closed. Excess flow prevention valve part 4
A reed switch 47 is provided on the outside of the reed switch 1 and is controlled to turn off by moving a poppet 44 made of a magnet.The reed switch 47 is connected to an external circuit via a terminal 48. The mechanism section 49 of the volume flow prevention valve section 41 is composed of a valve chamber 43, a poppet 44, a compression spring 45, and the like.

On the other hand, an electromagnetic gate valve section 50 is integrally formed on the downstream side of the check valve section 41 for excessive flow. This electromagnetic gate valve section 50
A flow path 51 is formed in the flow path 51, and a sleeve 53 connected to a solenoid assembly 52 attached to the outside of the electromagnetic gate valve section 50 is built into the flow path 51. A valve body 54 is coupled to the tip,
A valve rod 55 is further coupled to the tip of the valve body 54.

(12) Note that a valve chamber 56 is formed in a portion of the flow path 51 in which the valve body 54 is contained. A bellows 59 is attached to the outer periphery of the sleeve 53 and is supported between a stepped portion 57 provided on the sleeve 53 and a support member 58 attached to the inner wall of the flow path 51. Further, a support member 6o provided on the inner circumferential wall of the flow path 51 is also provided on the outer circumference of the valve stem 55.
A bellows 62 is supported between the valve body 54 and a support member 61 provided at the tip of the valve body 54.

Further, a spring 63 is attached to the outer periphery of the valve stem 55 inside the bellows 62, and constantly presses the valve body 54 toward the outlet of the valve chamber 56. Furthermore, the tip of the valve stem 55 is attached to a switch case 64 attached to the outside of the electromagnetic gate valve section 50.
A microswitch 65 is installed inside the switch case 64 and is turned on and off by the movement of the valve stem 55. The valve chamber 43 of the excessive flow prevention valve section 41 and the flow path 51 of the electromagnetic gate valve section 50 are communicated with each other through a pressure balance hole 66.

Next, the operation of this embodiment will be explained. In the normal (step 3) state, the pressure difference between the upstream and downstream sides of the excessive flow prevention valve section 41 is O as described above, so the valve body section 44A is on the left side in the figure and is in an open state. On the other hand, the solenoid assembly 52 lowers the valve body 54 of the electromagnetic gate valve section 50, and it is also in an open state. The open/close states of the overflow prevention valve section 41 and the electromagnetic gate valve section 50 are displayed in the central operation room by a reed switch 47 in the overflow prevention valve section 41 and by a microswitch 65 in the electromagnetic gate valve section 50. and can be constantly monitored.

Here, in the unlikely event that a pipe, valve, or instrument (not shown) connected to the downstream side of the outlet section 67 of the electromagnetic gate valve section 5o is damaged and the process fluid is lost, excessive flow can be prevented. A differential pressure is generated between the downstream side and the downstream side of the valve portion 41, and this differential pressure causes the valve body portion 44A to close the inlet of the narrow portion 46, thereby closing the excessive flow prevention valve portion 41.

At this time, when the poppet 44 moves, the KIJ-de switch 47 is activated, and due to the activation of the reed switch 47, the closed (14) state of the overflow prevention valve 41 is displayed in the υ central operation chamber, and the reed switch 47 is activated. A close signal from the switch 47 provides a close signal to the stain magnetic gate valve section 50 . This causes the solenoid assembly 52 to operate and pull up the valve body 54, closing the flow path 51'fr.

Then, the microswitch 65 is operated by the tip of the valve stem 55, and the closed state of the electromagnetic chamber gate valve section 50 is displayed in the central operation chamber by the microswitch 65.

Note that when the valve body 54 closes the flow path 51, it is assisted by the spring 63 to increase its responsiveness.

Moreover, since the valve body 54 is pressurized in the closing direction from the high pressure side of the generated differential pressure, even if the solenoid assembly IJ48 or the like fails, the valve body 54 will move in the closing direction and be set to the safe side. When the electromagnetic gate valve section 50 closes, the valve chamber 56 of the electromagnetic gate valve section 50 and the valve chamber 43 of the excessive flow prevention valve section 41 are brought into an equilibrium state by the pressure balance hole 66, and the poppet 4
4 is pressed leftward by a compression spring 45 and reset to an open state.

Figures 11 to 13 show the isolation valve with overflow prevention (15) valve function of this embodiment installed in the measurement line system. That is, the isolation valve 68 with an overflow prevention valve function of this embodiment is inserted into the detection pipe 3 outside the penetration part 4 provided in the containment vessel.

In this case, as shown in FIG. 13, six isolation valves 68 with overflow prevention valve functions are attached to the six detection pipes 3, so it can be seen that space efficiency is greatly improved.

According to this embodiment, the isolation valve 6 with an overflow prevention valve function includes an overflow prevention valve section 41 and an electromagnetic gate valve section 50 integrally formed.
8 is attached to the detection pipe 3, a series of operations can be performed automatically in the central control room, and unlike conventional technology, it is possible to manually perform operations in a crowded place with poor operability near the penetration part 4. This has the effect of eliminating the need for operations. In addition, since the isolation valve with overflow prevention valve function 61 is smaller than the one in which the overflow prevention valve and the isolation valve are independent, the process piping, tray, duct, etc., which was a problem in the layout planning around the containment vessel, Interference with electrical conduits and other equipment is greatly reduced, and space efficiency is significantly improved (16). This improves accessibility to equipment and has the effect of shortening inspection and repair time for these piping and equipment. However, instead of the conventional method where an overflow check valve and two isolation valves are attached to one detection pipe 3, it is only necessary to install one isolation valve 68 with an overflow check valve function. As the length becomes shorter and the number of parts decreases,
This has the effect of significantly reducing leakage factors and improving safety and reliability. Furthermore, since the opening/closing and reset operations of the isolation valve 68 with overflow prevention valve function are all remotely controlled from the central control room, the detection piping 3 in the event of an accident is
The closing time of the containment vessel 1 is significantly shortened, and the manual work of operators or workers around the containment vessel 1 is reduced, which has the effect of contributing to a reduction in radiation exposure. Furthermore, the above-mentioned effects have the effect of reducing the construction costs and operating costs of the υ plant.

〔Effect of the invention〕

As described above, according to the isolation valve with overflow prevention valve function (17) of the present invention, by integrally forming the overflow prevention valve part and the electromagnetic gate valve part, it can be automatically reset by remote control. It is possible to provide a space-saving isolation valve with an overflow prevention valve function for a measurement line.

[Brief explanation of drawings]

Figure 1 is a configuration diagram showing a conventional instrumentation piping system, Figure 2 is an enlarged sectional view taken along the line ■-■ in Figure 1, and Figure 3 is a plan view showing the state of piping around the conventional reactor containment vessel. , Figure 4 is a view from ■-■ arrow in Figure 3, Figure 5 is a view from ■-■ arrow in Figure 3, and Figure 6 is a view from ■-■ arrow in Figure 3.
The figure is a partially cutaway sectional view showing the structure of a conventional overflow check valve, Figure 7 is a sectional view taken along the line ■-■ of Figure 6, and Figure 8 is a known isolation valve with overflow check valve function for measurement lines. FIG. 9 is a partially cutaway sectional view showing the structure of FIG.
Fig. 0 is a partially cutaway cross-sectional view showing an embodiment of the isolation valve with overflow check valve function for measurement line of the present invention, and Fig. 11 is a partially cutaway sectional view showing an embodiment of the isolation valve with overflow check valve function for measurement line of the present invention. Fig. 12 is a plan view showing the state of piping around the reactor containment vessel in case of
It is an in arrow view. 41... Excess flow prevention valve section, 43.56... Valve chamber, 4
4... Poppet, 45... Compression spring, 46... Narrow portion, 50... Electromagnetic gate valve section, 52... Solenoid assembly, 54... Valve body, 63... Spring, 66
...Cuckoo (19) Eyes 12 Eyes 500 - 13 Figures

Claims (1)

[Claims] 1. A poppet, which is pressed upstream by a compression spring in a valve chamber provided in a flow path penetrating the casing and is locked to an end of the valve chamber, responds to the differential pressure between the upstream and downstream sides. an overflow prevention valve portion configured to be movable downstream in response to the excessive flow prevention valve portion; A valve body that moves forward by electromagnetic force is built into the flow path, and the valve body moves and closes the outlet on the downstream side of the valve chamber formed in the flow path. A measurement line comprising an electromagnetic gate valve section for closing a passage, and a pressure balance hole communicating between a valve chamber of the overflow prevention valve section and a valve chamber of the electromagnetic gate valve section. Isolation valve with overflow prevention valve function. 2. Claim 1, characterized in that the valve element of the electromagnetic gate valve section is provided with a spring arranged so that it is always pressed in the direction of the outlet of the valve chamber containing the valve element. Isolation valve with overflow prevention valve function for the measurement line described.