JP5851920B2 - Valve and plant equipped with the same - Google Patents

Description

  The present invention relates to a valve capable of suppressing fluid leakage and a plant equipped with the valve.

  The valve generally includes a valve body, a valve body driving rod for operating the valve body, and a valve housing in which a fluid main flow path in which the valve body is disposed is formed. The valve housing is formed with a rod insertion hole through which the valve element drive rod is inserted. One end of the valve element drive rod is attached to the valve element in the valve housing, and the other end protrudes to the outside of the valve housing.

  There is a gap between the inner peripheral surface of the rod insertion hole of the valve housing and the outer peripheral surface of the valve element drive rod, and the fluid in the housing leaks outside through this gap. Usually, in order to suppress this leakage, a seal member is disposed between the inner peripheral surface of the rod insertion hole and the outer peripheral surface of the valve element drive rod. However, when the pressure of the fluid flowing in the valve housing is high, even if the seal member is arranged, this fluid leaks to the outside.

  Therefore, in the following Patent Document 1, a valve capable of suppressing such fluid leakage is disclosed. A steam main flow path through which steam flows is formed in the housing of the valve. The valve body is disposed in the steam main flow path. In the housing, a first steam recovery path and a second steam recovery path for sucking steam in the rod insertion hole are formed, and a seal steam supply path for supplying sealing steam is formed in the rod insertion hole. ing. The second steam recovery path is formed closer to the steam main flow path than the seal steam supply path, and the first steam recovery path is formed closer to the steam main flow path than the second steam recovery path.

  In this valve, the steam flowing into the rod insertion hole from the steam main flow path is recovered by the first and second steam recovery paths positioned on the steam main flow path side with respect to the seal steam supply path. Further, by supplying the sealing steam into the rod insertion hole from the steam supply passage for sealing located farther from the main steam flow path than the first and second steam recovery paths, the main steam flow path to the inside of the rod insertion hole The steam that has flowed into the steam is prevented from coming to the steam supply path side for sealing.

Japanese Utility Model Publication No. 58-173704 (first and second figures)

  However, in the valve described in Patent Document 1, the steam that has not been recovered by the first and second steam recovery passages in the steam that has flowed into the rod insertion hole from the steam main flow path together with the steam for sealing is inserted into the rod insertion hole. There is a risk of leaking from the outside opening of the. Furthermore, in the valve described in Patent Document 1, the sealing steam leaks from the outer opening on the opposite side to the inner opening on the steam main flow path side through the rod insertion hole.

  That is, the valve described in Patent Document 1 has a problem that fluid leakage from the valve cannot be sufficiently suppressed.

  Therefore, the present invention focuses on the problems of the prior art, and an object thereof is to provide a valve capable of minimizing fluid leakage and a plant including the valve.

The valve according to the invention for achieving the above problems is as follows:
A valve body, a valve body drive rod having one end attached to the valve body, and a fluid main flow path in which the valve body is disposed are formed inside, and the valve body drive rod is inserted therethrough. A valve housing in which a rod insertion hole is formed,
The valve housing is opened at an inner peripheral surface of the rod insertion hole, and a first fluid recovery path for sucking and recovering the main fluid flowing into the rod insertion hole from the fluid main flow path, An inner peripheral surface of the rod insertion hole that opens at a position opposite to the fluid main flow path with respect to the opening of the first fluid recovery path, and a high-pressure sealing fluid from the outside in the rod insertion hole A seal fluid supply path for supplying the rod, and an opening at an inner peripheral surface of the rod insertion hole, and an opening at a position opposite to the fluid main flow path with respect to the opening of the seal fluid supply path, A second fluid recovery path for sucking and recovering the fluid in the hole is formed.

  With the valve, most of the main fluid that flows into the rod insertion hole from the fluid main flow path is recovered through the first fluid recovery path. Further, a sealing fluid is supplied to the rod insertion hole from a sealing fluid supply path. A part of the sealing fluid flows into the first fluid recovery path and is recovered. For this reason, in the region between the opening of the first fluid recovery path and the opening of the sealing fluid supply path in the rod insertion hole, a flow from the sealing fluid supply path toward the sealing fluid supply path is formed. Therefore, most of the main fluid that has flowed into the rod insertion hole from the fluid main flow path is recovered through the first fluid recovery path, as described above.

  Even if a part of the main fluid is not recovered through the first fluid recovery path and reaches the position of the sealing fluid supply path, a part of the supporting fluid is recovered along with the sealing steam. Collected through the road.

  Therefore, in the valve, leakage of the main fluid can be suppressed.

  Here, in the valve, flow path inner diameters of the first fluid recovery path and the second fluid recovery path may be larger than a flow path inner diameter of the sealing fluid supply path.

  In the valve, when the fluid in the rod insertion hole is sucked, the flow resistance can be reduced to suppress a decrease in the suction force of the fluid.

  Further, in the valve, the valve housing has an opening at an inner peripheral surface of the rod insertion hole as a part of the first fluid recovery path, and is recessed in a radial direction with respect to the valve body driving rod. An annular groove extending in the circumferential direction may be formed.

  In the valve, at the position where the first fluid recovery path in the rod insertion hole is open, the main fluid that has flowed into the rod insertion hole from the fluid main flow path is recovered over the entire circumference in the circumferential direction of the valve element drive rod. be able to.

  Further, in the valve, the valve housing has an opening at an inner peripheral surface of the rod insertion hole as a part of the sealing fluid supply passage, and is recessed in a radial direction with respect to the valve element driving rod. An annular groove extending in the circumferential direction may be formed.

  In the valve, the main fluid that has flowed from the fluid main flow path into the rod insertion hole reaches the position where the seal fluid supply path in the rod insertion hole is open, on the entire circumference in the circumferential direction of the valve element drive rod. Can be suppressed.

  Further, in the valve, the valve housing has an opening at an inner peripheral surface of the rod insertion hole as a part of the second fluid recovery path, and is recessed in a radial direction with respect to the valve body driving rod. An annular groove extending in the circumferential direction may be formed.

  In the valve, the fluid in the rod insertion hole can be recovered over the entire circumference in the circumferential direction of the valve element drive rod at the position where the second fluid recovery path in the rod insertion hole is open.

  The valve further includes a seal member that seals between an inner peripheral surface of the rod insertion hole and an outer peripheral surface of the valve element drive rod, and the seal member includes a shaft on which the valve element drive rod extends. A first recovery through-hole penetrating in a radial direction with respect to the valve element driving rod at a position where an opening of the first fluid recovery flow path in the direction is formed, and an opening of the sealing fluid supply path in the axial direction Is formed in the radial direction at a position where an opening of the second fluid recovery flow path in the axial direction is formed. Two recovery through holes may be formed.

  In the valve, the valve body drive rod may be supported by the valve housing so as to be movable in an axial direction in which the valve body drive rod extends. Further, in the valve, the valve body driving rod may be supported by the valve housing so as to be rotatable about a central axis of the valve body driving rod.

Further, a plant according to the invention for solving the above problems is
The main fluid pipe through which the main fluid flows, the valve installed in the main fluid pipe, the first fluid recovery path and the pipe are connected to each other, and the internal pressure is lower than the pressure of the main fluid. The sealing fluid is connected to the fluid recovery device and the sealing fluid supply passage through a pipe, and the sealing fluid is higher than the pressure at the position where the opening of the first fluid recovery passage is formed in the rod insertion hole. A sealing fluid supply device for supplying the rod through hole through the sealing fluid supply pipe, and the second fluid recovery path connected to the second fluid recovery path, and the second fluid recovery path in the rod insertion hole. And a second fluid recovery device whose internal pressure is lower than the pressure at the position where the opening is formed.

  Here, in the plant, the pressure of the sealing fluid in the sealing fluid supplier may be lower than the pressure of the main fluid in the fluid main flow path.

  In the plant, since the pressure of the sealing fluid is lower than the pressure of the main fluid in the fluid main flow path, the use cost of the sealing fluid can be suppressed.

  In the plant, the internal pressure of the second fluid recovery device may be lower than atmospheric pressure.

  In the plant, the fluid in the rod insertion hole leaks from the opening of the rod insertion hole that is on the opposite side of the fluid main flow path with respect to the position where the opening of the second fluid recovery path is formed. Can be prevented.

  Further, the plant includes a reactor pressure vessel that generates contaminated steam contaminated with radiation, and a contaminated main steam pipe through which the contaminated steam flows, wherein the main fluid is the contaminated steam, and the main fluid pipe May be the contaminated main steam line.

  In the said plant, it can suppress that the contaminated vapor | steam contaminated with the radiation leaks outside from the rod insertion hole of a valve.

  Further, in the plant, the steam turbine in which the contaminated steam generated in the reactor pressure vessel flows in via the contaminated main steam pipe, and a condenser for returning the contaminated steam that has driven the steam turbine to water. The second fluid recovery device may be the condenser.

  Since the inside of the condenser is basically less than atmospheric pressure, in the plant, the opening of the rod insertion hole in the valve and the opening of the second fluid recovery path connected to the condenser are formed. As a reference, it is possible to prevent the fluid in the rod insertion hole from leaking from the opening opposite to the fluid main flow path. Moreover, since the condenser returns the contaminated steam that has driven the steam turbine to water, even if the contaminated steam is contained in the steam recovered through the second fluid recovery path, This contaminated steam is mixed with the contaminated steam from the steam turbine or its condensate, and the diffusion of the contaminants can be suppressed.

  According to the present invention, fluid leakage from the valve can be minimized.

It is sectional drawing of the valve in one Embodiment which concerns on this invention. It is the II-II sectional view taken on the line in FIG. It is a systematic diagram of the plant in one embodiment concerning the present invention. It is sectional drawing of the valve in the 1st modification which concerns on this invention. It is sectional drawing of the valve in the 2nd modification which concerns on this invention.

  Hereinafter, an embodiment of a valve according to the present invention and a plant including the valve, and various modifications of the valve will be described in detail with reference to the drawings.

"Embodiment"
First, an embodiment of a valve according to the present invention and a plant including the valve will be described with reference to FIGS.

  The plant of this embodiment is a nuclear power plant as shown in FIG. This nuclear power plant includes a BWR (Boiling Water Reactor) type reactor pressure vessel 1, a reactor containment vessel 2 covering the reactor, a high-pressure steam turbine 3 driven by steam generated in the reactor pressure vessel 1, a high-pressure steam A moisture separator 4 that separates moisture from the steam exhausted from the turbine 3, a low-pressure steam turbine 5 that is driven by the steam separated from moisture by the moisture separator 4, and the high-pressure steam turbine 3 and the low-pressure steam turbine A generator 6 that generates electric power by driving 5, a condenser 7 that returns the steam exhausted from the low-pressure steam turbine 5 to water, and a water supply pump 8 that sends water in the condenser 7 into the reactor pressure vessel 1. It is equipped with.

  A main steam pipe 9 is connected between the reactor pressure vessel 1 and the high-pressure steam turbine 3. The main steam pipe 9 is provided with a main steam control valve 10 for adjusting the flow rate of the main steam flowing therethrough. The valve of this embodiment is the main steam control valve 10.

  As shown in FIG. 1, the main steam control valve 10 includes a valve body 11, a valve body drive rod 12 that operates the valve body 11, and a fluid main flow path 22 in which the valve body 11 is disposed. A cylindrical housing that seals between the valve housing 20 in which the rod insertion hole 32 into which the valve element driving rod 12 is inserted and the inner peripheral surface of the rod insertion hole 32 and the outer peripheral surface of the valve element driving rod 12 is sealed. And a seal member 15.

  A valve body 11 is fixed to one end of the valve body drive rod 12. Further, the other end of the valve element drive rod 12 is exposed from the valve housing 20, and a valve drive mechanism that moves the valve element drive rod 12 together with the valve element 11 in the axial direction A in which the valve element drive rod 12 extends. 19 is attached. In the following, in the axial direction A in which the valve element drive rod 12 extends, the side where the fluid main flow path 22 of the valve housing 20 exists is defined as the inside, and the opposite side is defined as the outside. The radial direction with respect to the valve element driving rod 12 is simply referred to as the radial direction.

  The valve housing 20 includes a housing main body 21 in which a main fluid flow path 22 is formed, and a bonnet 31 fixed to the housing main body 21 in the axial direction outside. The bonnet 31 is formed with the rod insertion hole 32 described above. The valve element drive rod 12 is supported by the bonnet 31 so as to be movable in the axial direction A.

  A first steam recovery path (first fluid recovery path) 34 that opens to the bonnet 31 at the inner peripheral surface of the rod insertion hole 32 and sucks the steam present in the rod insertion hole 32 to recover the steam. And a second steam recovery path (second fluid recovery path) 36 and a seal steam supply path (seal) that opens at the inner peripheral surface of the rod insertion hole 32 and supplies sealing steam from the outside into the rod insertion hole 32. Fluid supply path) 35 is formed.

  The opening of the sealing steam supply path 35 in the rod insertion hole 32 is formed on the inner side in the axial direction than the opening of the second steam recovery path 36. The opening in the rod insertion hole 32 of the first steam recovery path 34 is formed on the inner side in the axial direction than the opening of the steam supply path 35 for sealing. That is, among the opening of the first steam recovery path 34, the opening of the second steam recovery path 36, and the opening of the sealing steam supply path 35, the opening of the second steam recovery path 36 is formed on the outermost side in the axial direction. In addition, an opening of the steam supply passage 35 for sealing is formed, and an opening of the first steam recovery passage 34 is formed on the innermost side in the axial direction.

  The first steam recovery path 34 opens at the inner peripheral surface of the rod insertion hole 32, is recessed in the radial direction, and extends in the circumferential direction of the rod insertion hole 32, and this first steam recovery path 34. A first steam recovery main path 34p that opens in the groove bottom of the annular groove 34d and extends in the radial direction.

  Further, the sealing steam supply passage 35 is opened at the inner peripheral surface of the rod insertion hole 32, is recessed in the radial direction, and extends in the circumferential direction of the rod insertion hole 32. A steam supply main path 35p for sealing that extends in the radial direction and opens in the groove bottom of the steam supply annular groove 35d.

  The second steam recovery path 36 opens at the inner peripheral surface of the rod insertion hole 32, is recessed in the radial direction, extends in the circumferential direction of the rod insertion hole 32, and the second steam recovery path 36 d. A second steam recovery main path 36p that opens in the groove bottom of the annular groove 36d and extends in the radial direction.

  As shown in FIGS. 1 and 2, the cylindrical seal member 15 has a plurality of first steam recoveries penetrating in a radial direction at a position where an opening of the first steam recovery path 34 in the axial direction A is formed. A plurality of seal steam supply through-holes 17 penetrating in a radial direction at a position where the opening of the seal steam supply passage 35 in the axial direction A is formed, and the second steam recovery in the axial direction A A plurality of second steam recovery through holes 18 penetrating in the radial direction are formed at positions where the openings of the passages 36 are formed.

  Therefore, the plurality of first steam recovery through holes 16 of the seal member 15 communicate with the first steam recovery annular groove 34 d and the first steam recovery main path 34 p of the first steam recovery path 34 formed in the bonnet 31. It will be. The plurality of seal steam supply through holes 17 of the seal member 15 communicate with the seal steam supply annular groove 35d and the seal steam supply main path 35p of the seal steam supply path 35 formed in the bonnet 31. become. Further, the plurality of second steam recovery through holes 18 of the seal member 15 communicate with the second steam recovery annular groove 36 d and the second steam recovery main path 36 p of the second steam recovery path 36 formed in the bonnet 31. It will be.

  The first steam recovery main path 34p of the main steam control valve 10 is connected to a first steam recovery device (first fluid recovery device) 44 via a first steam recovery pipe 44p. The main steam supply path 35p for sealing of the main steam control valve 10 is connected to a sealing steam supply unit (sealing fluid supply unit) 45 via a sealing steam supply pipe 45p. The second steam recovery main path 36p of the main steam control valve 10 is connected to a second steam recovery device (second fluid recovery device) 46 via a second steam recovery pipe 46p.

  The pressure Pc in the first steam recovery device 44 is lower than the main steam pressure Pa in the fluid main flow path 22 of the main steam control valve 10. Specifically, for example, when the main steam pressure Pa in the main fluid flow path 22 of the main steam control valve 10 is 5 megapascals, the pressure Pc in the first steam recovery device 44 is about 0.5 megapascals. The pressure Pe in the seal steam supply 45 is a pressure at a position where the opening of the first steam recovery passage 34 is formed in the rod insertion hole 32, that is, a pressure in the first steam recovery annular groove 34d. It is higher than Pb. Specifically, for example, the main steam pressure Pa in the fluid main flow path 22 of the main steam control valve 10 is 5 megapascals, and the pressure Pc in the first steam recovery unit 44 is about 0.5 megapascals. When the pressure Pb in the steam recovery annular groove 34d is about 0.6 to 1 megapascal, the pressure Pe in the seal steam supplier 45 is about 1.5 megapascal. The pressure Pf in the second steam recovery unit 46 is the pressure at the position where the opening of the second steam recovery path 36 is formed in the rod insertion hole 32, that is, the pressure in the second steam recovery annular groove 36d. It is lower than Pd, for example, 0.1 megapascal or less (atmospheric pressure or less).

  In the plant of the present embodiment, the first steam collector 44 is a container in which, for example, steam extracted from the low-pressure steam turbine 5 is temporarily stored. The second steam recovery unit 46 is a condenser 7 having a negative pressure inside. Moreover, the steam supply unit 45 for sealing is a unique boiler or heat exchanger that generates clean steam that is generated in the reactor pressure vessel 1 and is not contaminated with radiation, in addition to the main steam that is contaminated with radiation. Etc.

  Here, the inner diameters of the first steam recovery main path 34p and the second steam recovery main path 36p formed in the bonnet 31 are the same as the inner diameter of the sealing steam supply main path 35p formed in the bonnet 31. Bigger than. Similarly, the diameters of the first steam recovery through hole 16 and the second steam recovery through hole 18 formed in the seal member 15 are larger than the diameter of the seal steam supply through hole 17 formed in the seal member 15. Is also big. This is to suppress a decrease in the suction force of the steam by reducing the flow resistance when sucking the steam in the rod insertion hole 32.

  Next, the sealing performance of the main steam control valve 10 described above will be described.

  A part of the main steam that has flowed into the fluid main flow path 22 of the valve housing 20 in the main steam control valve 10 flows into the rod insertion hole 32, particularly, between the valve element drive rod 12 and the seal member 15 that is in sliding contact therewith. Most of the main steam that has flowed between the valve element drive rod 12 and the seal member 15 in the rod insertion hole 32 is sucked by the first steam collector 44 having a pressure lower than that of the main steam, and the seal member 15 through the first steam recovery through-hole 16 through the first steam recovery annular groove 34d and the first steam recovery main path 34p of the bonnet 31, and is recovered by the first steam recovery device 44. Most of the main steam flowing between the inner peripheral surface of the rod insertion hole 32 and the outer peripheral surface of the seal member 15 passes through the first steam recovery annular groove 34d and the first steam recovery main path 34p of the bonnet 31. Then, it is recovered in the first steam recovery unit 44.

  In the present embodiment, the sealing steam from the sealing steam supply 45 flows into the rod insertion hole 32 through the sealing steam supply main path 35p and the sealing steam supply annular groove 35d. The pressure Pe of the sealing steam from the sealing steam supplier 45 is higher than the pressure Pb in the first steam recovery annular groove 34d. For this reason, a part of the sealing steam flowing into the rod insertion hole 32 is recovered by the first steam recovery device 44 via the first steam recovery annular groove 34d and the first steam recovery main path 34p. Therefore, in the region between the sealing steam supply annular groove 35d and the first steam recovery annular groove 34d in the rod insertion hole 32, the flow from the sealing steam supply annular groove 35d toward the first steam recovery annular groove 34d, that is, A flow toward the inside in the axial direction is formed. Thus, in the rod insertion hole 32, a flow from the steam supply annular groove 35 d for sealing toward the first steam recovery annular groove 34 d is formed, so that the fluid main flow path 22 of the valve housing 20 enters the rod insertion hole 32. The main steam that has flowed in hardly flows axially outside the first steam recovery annular groove 34d, and most of the main steam passes through the first steam recovery annular groove 34d and the first steam recovery main path 34p and passes through the first steam recovery unit 44. To be recovered.

  Also, temporarily, a part of the main steam is not recovered by the first steam recovery device 44 via the first steam recovery annular groove 34d and the first steam recovery main path 34p, and reaches the position of the seal steam supply annular groove 35d. However, it is sucked together with the sealing steam by the second steam recovery unit 46 at atmospheric pressure or less, and recovered by the second steam recovery unit 46 through the second steam recovery annular groove 36d and the second steam recovery main path 36p. The Further, since the pressure in the second steam recovery unit 46 is lower than the atmospheric pressure, a little amount of air is sucked from the axially outer opening 33 of the rod insertion hole 32, and this air is also recovered by the second steam recovery unit 46. .

  As described above, in this embodiment, even if a part of the main steam is not recovered by the first steam recovery unit 44 via the first steam recovery path 34 and reaches the position of the seal steam supply path 35, Since it is recovered by the second steam recovery unit 46 at atmospheric pressure or less together with the steam for use, leakage of the main steam contaminated with radiation to the outside can be substantially eliminated. Furthermore, in this embodiment, it is possible to prevent leakage of sealing steam and main steam from the axially outer opening 33 of the rod insertion hole 32.

  In addition, although the valve of this embodiment is the main steam control valve 10 which adjusts the flow volume of the main steam which flows through the main steam piping 9, the main steam cutoff valve which interrupts | blocks the flow of the main steam in this main steam piping 9 is used. The configuration described above may be adopted for the valve housing.

"First variation"
Next, a first modification of the valve in the above embodiment will be described with reference to FIG.

  The valve 10a of this modification is formed by forming two first steam recovery passages 34x, 34y in the bonnet 31a and two first steam recovery through holes 16x, 16y in the seal member 15a. The configuration is basically the same as the valve of the above embodiment.

  The two first steam recovery paths 34 x and 34 y are both formed on the inner side in the axial direction than the sealing steam supply path 35. The two first steam recovery paths 34x and 34y are both connected to steam collectors 44x and 44y that are independent of each other via pipes 44px and 44py. The pressure in the steam recovery unit 44y connected to the first steam recovery path 34y located on the axially outer side is higher than the pressure of the steam recovery unit 44x connected to the first steam recovery path 34x positioned on the axially inner side. Is also low.

  For this reason, in this modification, the main steam that could not be recovered by the steam recovery unit 44x from the first steam recovery path 34x located on the inner side in the axial direction is recovered from the first steam recovery path 34y positioned on the outer side in the axial direction. It can collect | recover in the container 44y.

"Second modification"
Next, a second modification of the valve in the above embodiment will be described with reference to FIG.

  In the above-described embodiment and the first modification, the valves 10 and 10a are such that the valve body 11 and the valve body drive rod 12 move in the axial direction A. On the other hand, in this modification, the valve body 11b and the valve body drive rod 12b rotate around the central axis of the valve body drive rod 12b.

  The valve body 11b of the present modification has a disc shape. The valve body 11b is attached to one side of the valve body drive rod 12b so that the center of the disc-shaped valve body 11b is positioned on the extension line of the valve body drive rod 12b. The valve element driving rod 12b is supported by the valve housing 20b so as to be rotatable about its central axis. A valve drive mechanism 19b that rotates the valve body drive rod 12b around its central axis together with the valve body 11b is attached to the other end of the valve body drive rod 12b. That is, the valve 10b of this modification is a butterfly valve.

  Also in the valve housing 20b of the present modification, a rod insertion hole 32b through which the valve element drive rod 12b is inserted is formed in the same manner as in the above embodiment, and the first steam recovery path 34b opened by the rod insertion hole 32b. A steam supply path 35b for sealing and a second steam recovery path 36b are formed.

  The first steam recovery through hole 16b, the seal steam supply through hole 17b, and the second steam recovery through hole 18b are also formed in the seal member 15b of this modification, as in the above embodiment.

  The first steam recovery path 34b of the valve housing 20b is connected to a first steam recovery unit (not shown) via a pipe (not shown) as in the above embodiment, and the sealing steam supply path 35b is connected to a pipe (not shown). The second steam recovery path 36b is connected to a second steam recovery unit (not shown) via a pipe (not shown).

  Also in this modified example, as in the above embodiment, a part of the steam in the fluid main flow path 22b of the valve housing 20b is not recovered by the first steam recovery device via the first steam recovery path 34b, and the steam supply for sealing is provided. Even if it reaches the position of the path 35b, it is recovered by the second steam recovery device together with the sealing steam. Furthermore, also in this modification, it is possible to prevent vapor from leaking from the axially outer opening 33b of the rod insertion hole 32b.

  That is, if the first steam recovery path 34b, the seal steam supply path 35b, and the second steam recovery path 36b that open at the rod insertion hole 32b are formed in the valve housing 20b, the valve element drive rod 12b is centered on the central axis thereof. Even if the valve rotates as described above, the same effect as in the above embodiment can be obtained. Here, the butterfly valve is exemplified as the valve in which the valve element driving rod 12b rotates about its central axis. However, the valve element is centered by rotating the valve element driving rod about its central axis. It goes without saying that the same effect can be obtained even if the swing valve swings about the axis by adopting the same configuration.

  In both the above embodiment and each modification, the fluid flowing in the fluid main flow path of the valve housing is steam. However, the present invention is not limited to this, and may be applied to valves for other fluids such as toxic gases. In this case, the sealing fluid supplied from the sealing fluid supply path to the rod insertion hole is preferably a gas that does not chemically react with the gas flowing in the fluid main flow path of the valve housing and is not toxic, for example, nitrogen.

  1: Reactor pressure vessel, 3: High pressure steam turbine, 5: Low pressure steam turbine, 6: Generator, 7: Condenser, 9: Main steam pipe, 10: Main steam control valve (valve), 10a, 10b: Valve, 11, 11a, 11b: Valve body, 12, 12b: Valve body drive rod, 15, 15a, 15b: Seal member, 16, 16b, 16x, 16y: Through hole for first steam recovery, 17, 17b: Seal Steam supply through hole, 18, 18b: Second steam recovery through hole, 19, 19b: Valve drive mechanism, 20, 20b: Valve housing, 21: Housing body, 22, 22b: Fluid main flow path, 31, 31a: Bonnet, 32, 32b: Rod insertion hole, 34, 34b, 34x, 34y: First steam recovery path (first fluid recovery path), 34d: First steam recovery annular groove, 34p: First steam recovery main path, 35 , 35b: Steam for sealing Supply path (sealing fluid supply path), 35d: sealing steam supply annular groove, 35p: sealing steam supply main path, 36, 36b: second steam recovery path (second fluid recovery path), 36d: second steam Recovery annular groove, 36p: second steam recovery main path, 44, 44x, 44y: first steam recovery device, 45: steam supply device for sealing, 46: second steam recovery device

Claims (13)

The disc,
A valve element drive rod having one end attached to the valve element;
A valve housing in which a fluid main flow path in which the valve body is disposed is formed inside, and a rod insertion hole into which the valve body drive rod is inserted; and
With
The valve housing includes
A first fluid recovery path that opens at the inner peripheral surface of the rod insertion hole and sucks and recovers the main fluid that has flowed into the rod insertion hole from within the fluid main flow path;
An inner peripheral surface of the rod insertion hole, which opens at a position opposite to the fluid main flow path with respect to the opening of the first fluid recovery path, and is used for high-pressure sealing from the outside in the rod insertion hole A fluid supply path for sealing for supplying fluid;
Opening at the inner peripheral surface of the rod insertion hole, opening at a position opposite to the fluid main flow path with reference to the opening of the sealing fluid supply path, and sucking and collecting the fluid in the rod insertion hole A second fluid recovery path for,
A valve characterized by being formed. The valve of claim 1,
The flow path inner diameters of the first fluid recovery path and the second fluid recovery path are larger than the flow path inner diameter of the sealing fluid supply path,
A valve characterized by that. The valve according to claim 1 or 2,
In the valve housing, as a part of the first fluid recovery path, an opening is formed in an inner peripheral surface of the rod insertion hole, a recess is formed in a radial direction with respect to the valve element driving rod, and a circumferential direction of the rod insertion hole extends. An annular groove is formed,
A valve characterized by that. The valve according to any one of claims 1 to 3,
In the valve housing, as a part of the sealing fluid supply path, an opening is formed on the inner peripheral surface of the rod insertion hole, and the valve housing is recessed in a radial direction with respect to the valve element driving rod, and extends in the circumferential direction of the rod insertion hole. An annular groove is formed,
A valve characterized by that. The valve according to any one of claims 1 to 4,
In the valve housing, as a part of the second fluid recovery path, an opening is made in the inner peripheral surface of the rod insertion hole, a recess is formed in the radial direction with respect to the valve element drive rod, and the circumferential direction of the rod insertion hole extends. An annular groove is formed,
A valve characterized by that. The valve according to any one of claims 1 to 5,
A seal member for sealing between the inner peripheral surface of the rod insertion hole and the outer peripheral surface of the valve element drive rod;
A first recovery penetration penetrating in a radial direction with respect to the valve body drive rod at a position where an opening of the first fluid recovery passage is formed in the seal member in an axial direction in which the valve body drive rod extends. A sealing fluid supply through-hole penetrating in the radial direction at a position where an opening of the sealing fluid supply passage in the axial direction is formed, and an opening of the second fluid recovery passage in the axial direction. A second recovery through-hole penetrating in the radial direction is formed at the formed position,
A valve characterized by that. The valve according to any one of claims 1 to 6,
The valve body drive rod is supported by the valve housing so as to be movable in the axial direction in which the valve body drive rod extends.
A valve characterized by that. The valve according to any one of claims 1 to 6,
The valve body driving rod is supported by the valve housing so as to be rotatable about the central axis of the valve body driving rod.
A valve characterized by that. A main fluid pipe through which the main fluid flows;
The valve according to any one of claims 1 to 8, which is installed in the main fluid pipe;
A first fluid recovery device that is connected to the first fluid recovery path through a pipe and has an internal pressure lower than the pressure of the main fluid;
The seal fluid supply path is connected to the seal fluid supply path via a pipe, and the seal fluid is higher than the pressure at the position where the opening of the first fluid recovery path is formed in the rod insertion hole. A fluid supply for sealing that is supplied into the rod insertion hole via a pipe;
A second fluid recovery device connected to the second fluid recovery passage through a pipe and having an internal pressure lower than the pressure at the position where the opening of the second fluid recovery passage is formed in the rod insertion hole;
A plant characterized by comprising: The plant according to claim 9,
The pressure of the sealing fluid in the sealing fluid supplier is lower than the pressure of the main fluid in the fluid main flow path;
A plant characterized by that. In the plant according to claim 9 or 10,
The internal pressure of the second fluid recovery device is lower than atmospheric pressure,
A plant characterized by that. In the plant according to any one of claims 9 to 11,
A reactor pressure vessel that generates contaminated steam contaminated with radiation; and
A contaminated main steam pipe through which the contaminated steam flows;
With
The main fluid is the contaminated steam, and the main fluid pipe is the contaminated main steam pipe.
A plant characterized by that. The plant according to claim 12,
A steam turbine in which the contaminated steam generated in the reactor pressure vessel flows through the contaminated main steam pipe;
A condenser for returning the contaminated steam that has driven the steam turbine to water;
With
The second fluid recovery device is the condenser.
A plant characterized by that.

Images