JP2009008222A - Check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase sealing performance at the valve-closing time, in a check valve, without interference with the characteristics at the valve-opening time. <P>SOLUTION: When a channel of the check valve is shut down, a resin made sealing material intervenes between a seat ring 25 and a valve element 3 and seals hermetically. The seal material is fitted and fixed to one side of the seat ring 25 or the valve element 3. Further, an electromagnet is attached to near the seat ring 25 of the valve element 3 and at the time of turning on electricity, the valve element 3 is sucked by magnetic force. Further, an electromagnetic valve which can open and close the channel of the valve box 1 inside the different position from the seat ring 25 and a detecting element which detects pressure differences of upstream side and down stream side of the seat ring 25 are provided and when the counter pressure gets to a predetermined value or more, the electromagnetic valve may be closed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a check valve, and more particularly to a check valve that is suitable for installation in an air line for nuclear power generation and has high sealing performance when the valve is closed.

  Conventionally, in a check valve for preventing a back flow of a secondary (downstream side) fluid in a plant, such as a check valve installed in a nuclear power generation air line or the like, a valve box side seat portion and a valve body side seat portion However, both are made of metal, and it is difficult to maintain a good sealing property at the time of manufacture for a long time, and the reliability is not high. Further, if the fluid is a gas, it is more difficult to maintain the sealing property.

On the other hand, a technique for improving the sealing performance when the valve is closed by using a rubber lining or an organic material for the seal portion of the check valve is known (see Patent Document 1 to Patent Document 3). Moreover, the technique which improves a sealing performance using a permanent magnet is known (refer patent document 4 and patent document 5).
JP-A-9-26045 Japanese Patent Laid-Open No. 55-94968 Japanese Utility Model Publication No. 5-17277 Japanese Patent Laid-Open No. 10-332007 Japanese Patent Laid-Open No. 11-173443

  However, Patent Document 1 to Patent Document 3 do not specifically disclose how to attach the rubber lining or the organic material seal portion. Moreover, in patent document 4 and patent document 5, since a permanent magnet is used, the characteristic at the time of valve opening may be obstructed.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a check valve with improved sealing performance when the valve is closed, without affecting the characteristics when the valve is opened.

  In order to achieve the above object, a check valve according to the present invention includes a metal valve box having a valve seat and forming a flow path, and is movable in the valve box. A metal valve body that opens and closes the flow path between the valve seat and the valve seat or valve body so as to be sealed between the valve seat and the valve body when the flow path is closed And a resin sealing material fitted and attached to at least one of the above.

  In another aspect of the check valve according to the present invention, a valve box having a valve seat and forming a flow path is movable between the valve box and the valve seat by the movement. And a valve body that opens and closes the flow path, and an electromagnet that is attached near the valve seat of the valve box and can attract the valve body by magnetic force when energized.

  ADVANTAGE OF THE INVENTION According to this invention, the sealing performance at the time of valve closing can be improved, without affecting the characteristic at the time of valve opening of a non-return valve.

  Hereinafter, embodiments of a check valve according to the present invention will be described with reference to the drawings. Here, the same or similar parts are denoted by common reference numerals, and redundant description is omitted.

[First Embodiment]
FIG. 1 is a longitudinal sectional view showing a first embodiment of a check valve according to the present invention, and FIG. 2 is a detailed longitudinal sectional view showing an example of a valve seat in the check valve of FIG. In the check valve shown in FIG. 1, a flow path connecting from the valve box inlet 20 to the valve box outlet 21 is formed in the valve box 1 so that the flow path can be opened and closed by the movement of the movable valve element 3. It is configured. An arm 5 is attached to the valve body 3, and the arm 5 is rotatable about a spindle 4 attached at a position above the valve seat 25 of the valve box 1. A valve box side seat 2 is attached to a valve seat 25 that is a part of the valve box 1 that comes into contact with the valve body 3. Main parts such as the valve box 1, the valve body 3, and the arm 5 are made of metal.

  When the valve box inlet 20 is at a higher pressure than the valve box outlet 21, the fluid in the valve box 1 opens the flow path by pushing the valve body 3 from the valve box inlet 20 side toward the valve box outlet 21 side, The fluid flows from the valve box inlet 20 toward the valve box outlet 21. Conversely, when the valve box inlet 20 is at a lower pressure than the valve box outlet 21, the fluid in the valve box 1 pushes the valve body 3 from the valve box outlet 21 side toward the valve box inlet 20 side, thereby causing a flow path. Close.

  In the configuration example shown in FIG. 2, a ring-shaped screw-in resin sheet 6 is attached to a portion of the valve box side sheet 2 that contacts the valve body 3. In the first embodiment, the valve body 3 is made of metal, and no resin sealing member is attached to the valve body 3.

  According to this embodiment, when the valve is closed, the screw-in type resin sheet 6 and the metal portion of the valve body 3 come into contact with each other to press and prevent leakage.

  FIG. 3 is a detailed longitudinal sectional view showing an example of the valve seat in the check valve of FIG. 1 different from FIG. In this configuration example, a ring-shaped pressing-down resin sheet 7 is attached to a portion of the valve box side sheet 2 that contacts the valve body 3.

  FIG. 4 is a detailed longitudinal sectional view showing an example of the valve seat in the check valve shown in FIG. 1 different from those shown in FIGS. In this configuration example, a ring-shaped O-ring fitting resin sheet 8 is attached to a portion of the valve box side sheet 2 that contacts the valve body 3.

  FIG. 5 is a detailed longitudinal sectional view showing an example of the valve seat in the check valve of FIG. 1 different from FIGS. 2 to 4. In this configuration example, a ring-shaped lining-type resin sheet 9 is attached to a portion of the valve box side sheet 2 that contacts the valve body 3.

  3 to 5, similarly to the case of FIG. 2, when the valve is closed, the resin seal member and the metal part of the valve body 3 come into contact with each other to suppress leakage. Can do.

[Second Embodiment]
FIG. 6 is a longitudinal sectional view showing a second embodiment of the check valve according to the present invention, and FIG. 7 is a detailed longitudinal sectional view showing an example of a valve body in the check valve of FIG. In the check valve shown in FIG. 6, the resin seal member is not attached to the valve seat 25 of the valve box 1, and the screw-in type resin sheet 10 shown in FIG. 7 is attached to the valve body 3. Other configurations are the same as those of the first embodiment.

  According to this embodiment, when the valve is closed, the screw-in type resin sheet 10 and the metal portion of the valve seat 25 come into contact with each other and can be pressed against each other, thereby preventing leakage.

  8 is a detailed longitudinal sectional view showing an example of the valve body in the check valve of FIG. 6 different from FIG. In this configuration example, a press-down resin sheet 11 is attached to a portion of the valve body 3 that contacts the valve seat 25.

  FIG. 9 is a detailed longitudinal sectional view showing an example of the valve body in the check valve of FIG. 6 different from FIG. 7 and FIG. In this configuration example, an O-ring type embedded resin sheet 12 is attached to a portion of the valve body 3 that contacts the valve seat 25.

  FIG. 10 is a detailed longitudinal sectional view showing an example of the valve body of the check valve shown in FIG. 6 different from those shown in FIGS. In this configuration example, a lining type resin sheet 13 is attached to a portion of the valve body 3 that contacts the valve seat 25.

  Also in the configuration examples of FIGS. 8 to 10, similarly to the case of FIG. 7, when the valve is closed, the resin seal member and the metal portion of the valve seat 25 come into contact with each other to suppress leakage. Can do.

[Third Embodiment]
FIG. 11 is a longitudinal sectional view showing a third embodiment of the check valve according to the present invention. In this embodiment, a pressure detector 30 that detects the pressure upstream of the valve seat 25 of the valve box 1 is disposed. Further, the valve box side seat 2 is disposed in the valve seat 25, and the electromagnet 14 is incorporated in the valve box side seat 2. A cable 31 for passing an electric current through the electromagnet 14 passes through the valve box 1, and an electromagnet power source (not shown) is outside the valve box 1 and connected to the cable 31. A permanent magnet 15 is incorporated in the valve body 3, and the electromagnet 14 and the permanent magnet 15 are disposed so as to face each other in the close state when the valve is closed. Other configurations are the same as those of the first embodiment.

  With such a configuration, when the electromagnet 14 is energized when the valve is closed, the electromagnet 14 and the permanent magnet 15 can be attracted to each other by magnetic force. Thereby, the leakage at the time of valve closing can be suppressed. Further, the valve can be opened by stopping energization of the electromagnet 14 when the pressure detector 30 detects a positive pressure.

[Fourth Embodiment]
FIG. 12 is a longitudinal sectional view showing a fourth embodiment of the check valve according to the present invention. In this embodiment, the primary pressure extraction part 40 is arranged upstream of the valve seat 25 of the valve box 1, and the secondary pressure extraction part 41 is arranged downstream of the valve seat 25 of the valve box 1. Yes. And the differential pressure detector 16 which detects the pressure difference of the primary side pressure extraction part 40 and the secondary side pressure extraction part 41 is arrange | positioned. Further, the electromagnetic valve 17 is disposed downstream of the valve seat 25 of the valve box 1 and upstream of the secondary pressure extraction portion 41. Other configurations are the same as those of the first embodiment.

  According to this embodiment, when the differential pressure detector 16 detects that the secondary side pressure is higher than the primary side pressure (reverse pressure), the solenoid valve 17 is closed to suppress leakage. be able to.

[Other Embodiments]
Each embodiment described above is merely an example, and the present invention is not limited thereto.

  For example, in 3rd Embodiment (FIG. 11), a permanent magnet can also be abbreviate | omitted by using a magnetic material for a valve body.

  The features of the above embodiments can be combined in various ways.

  For example, it is good also as a non-return valve provided with both the valve box side resin seal member of 1st Embodiment, and the valve body side resin seal member of 2nd Embodiment.

  In the above description, the third embodiment (FIG. 11) and the fourth embodiment (FIG. 12) show an example modified based on the first embodiment (FIG. 1). Or you may deform | transform based on the structural example of FIG. Furthermore, it may be modified based on the second embodiment (FIGS. 6 to 10).

  Further, in the third embodiment, similarly to the fourth embodiment, two pressure extraction portions can be provided, and the power source of the electromagnetic valve can be operated by the differential pressure.

The longitudinal cross-sectional view which shows 1st Embodiment of the non-return valve which concerns on this invention. The detailed longitudinal cross-sectional view which shows an example of the valve seat in the non-return valve of FIG. The detailed longitudinal cross-sectional view which shows the example different from FIG. 2 of the valve seat in the non-return valve of FIG. The detailed longitudinal cross-sectional view which shows the further different example of the valve seat in the non-return valve of FIG. The detailed longitudinal cross-sectional view which shows the further different example of the valve seat in the non-return valve of FIG. The longitudinal cross-sectional view which shows 2nd Embodiment of the non-return valve which concerns on this invention. The detailed longitudinal cross-sectional view which shows an example of the valve body in the non-return valve of FIG. The detailed longitudinal cross-sectional view which shows the example different from FIG. 7 of the valve body in the non-return valve of FIG. The detailed longitudinal cross-sectional view which shows the further different example of the valve body in the non-return valve of FIG. The detailed longitudinal cross-sectional view which shows the further different example of the valve body in the non-return valve of FIG. The longitudinal cross-sectional view which shows 3rd Embodiment of the non-return valve which concerns on this invention. The longitudinal cross-sectional view which shows 4th Embodiment of the non-return valve which concerns on this invention.

Explanation of symbols

1: Valve box 2: Valve box side sheet 3: Valve body 4: Spindle 5: Arm 6: Screw-in resin sheet 7: Press-in resin sheet 8: Insert-in resin sheet 9: Lining resin sheet 10: Screw-in resin sheet 11: Hold-down resin sheet 12: Fit-in resin sheet 13: Lining resin sheet 14: Electromagnet 15: Permanent magnet 16: Differential pressure detector 17: Solenoid valve 20: Valve box inlet 21: Valve box outlet 25: Valve seat 30 : Pressure detector 31: Cable 40: Primary side pressure extraction part 41: Secondary side pressure extraction part

Claims (5)

A metal valve box having a valve seat and forming a flow path;
A metal valve body that is movable in the valve box and opens and closes the flow path with the valve seat by the movement; and
A resin sealing material fitted and fitted into at least one of the valve seat or the valve body so as to be sealed between the valve seat and the valve body when the flow path is closed;
Having a check valve. An electromagnet attached near the valve seat of the valve box and capable of attracting the valve body by magnetic force when energized;
The check valve according to claim 1.   The check valve according to claim 2, wherein a permanent magnet is attached to the valve body. An electromagnetic valve capable of opening and closing the flow path in the valve box at a position different from the valve seat;
A detector for detecting a pressure difference between the upstream side and the downstream side of the valve seat and the solenoid valve;
The electromagnetic valve is configured to be closed when the reverse pressure applied to the check valve exceeds a predetermined value. A check valve according to claim 1. A valve box having a valve seat and forming a flow path;
A valve body that is movable in the valve box and opens and closes the flow path with the valve seat by the movement;
An electromagnet attached to the valve seat near the valve seat and capable of attracting the valve body by magnetic force when energized;
Having a check valve.

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