JP5214959B2 - Check valve device - Google Patents

Description

  The present invention relates to a check valve device in which a check valve unit is replaceably incorporated.

  A check valve device incorporating a check valve unit in a replaceable manner is shown, for example, in FIGS. 5 and 6 of Patent Document 1, and has primary and secondary connection ports at both ends, and is vertically provided. The secondary side is a vertical valve chamber through the internal through hole, a main body formed by opening the upper end of the valve chamber and opening the inlet, a lid detachably attached to the inlet, And a check valve unit incorporated in the valve chamber so as to be removable.

  In this configuration, the check valve unit is a ball check valve in which a ball valve body is accommodated in a cylindrical basket. When the flow is normal, the ball valve body is lifted by primary pressure or buoyancy to open a through hole. On the other hand, when a reverse flow occurs, the ball valve body drops due to a reverse pressure (secondary pressure) or its own weight, and the through hole is closed. And, without disassembling the piping, maintenance such as removing the check valve unit can be performed simply by removing the lid from the main body, and if necessary, it can be replaced with a new check valve unit.

JP 7-280114 A

  However, according to the above-described prior art, the work for removing the lid for maintenance can be relatively easily performed using a commercially available tool. However, the unit type check valve remains in the main body simply by removing the lid. In addition to removing the valve, it was necessary to take out the check valve. In this regard, in water pipes, a meter box with a check valve connected to the secondary side of the water meter is buried in the ground, but if the check valve device with the above configuration is used as the check valve, it is built in from the main body. In order to take out the check valve unit and replace it, it was forced to work in an unreasonable posture by pushing its hand into the meter box, which is a small space. In particular, when the meter box is buried deeper than usual (for example, about 60 cm) as a countermeasure against cold, the operation is more difficult.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a check valve device in which a check valve unit can be easily taken out and maintenance can be performed more easily.

  In order to achieve the above-mentioned object, the present invention adopts means for improving the prior art and configuring the built-in check valve unit to be detachable together with the lid. That is, the present invention is provided with a primary side and a secondary side connection port in the horizontal direction, forming a valve chamber vertically in the secondary side, and opening the upper end of the valve chamber, A check valve unit including a ball valve body incorporated in the valve chamber so as to be removable via the opening; a lid for detachably attaching the valve chamber to the opening; and the lid and the check valve unit vertically It consists of joints that are integrally connected in the direction.

  The check valve unit is preferably composed of a cylindrical basket having a flow path on the side surface and a valve seat provided on the lower surface of the basket, and a ball valve element is accommodated inside the basket.

  The joint preferably has a structure in which the lid and the basket of the check valve unit are detachably connected. In particular, an inward flange is formed on the inner periphery of the lower edge of the female screw hole through which the check valve unit can be inserted. On the other hand, the check valve unit has an outward flange that can be locked with the inward flange of the joint on the upper edge of the basket, and further, the female of the joint is formed at the lower part of the lid. It is preferable to form a male screw that is screwed into the screw hole.

  Apart from this, it is preferable that the joint is a nut integrated with the upper end of the basket of the check valve unit, and the cap is formed with a male screw that is screwed with the female screw of the joint.

  It is preferable that a pressure relief hole that can communicate with the valve chamber is formed in the lid, and a plug is detachably provided in the pressure relief hole.

  Since the check valve device of the present invention has a structure in which the sealing lid and the check valve unit are connected by a joint, if the sealing lid is taken out, the check valve unit can be removed together with the check lid unit. Unit replacement and maintenance workability is improved. Further, by adopting a ball type check valve as the check valve unit, the structure is simple and a high backflow prevention function can be obtained. If a cap nut-like joint is employed, the check valve unit and the lid need only be slightly changed from the conventional structure. On the other hand, when the joint is integrated with the check valve unit basket, the number of parts can be reduced, and assembly and disassembly to the main body can be performed with less man-hours. Furthermore, if the lid is provided with a pressure relief plug, the sealing lid can be removed safely and easily.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an assembled cross-sectional view of a check valve device according to an embodiment of the present invention, wherein 1 is a main body, 2 is a lid, 3 is a pressure relief plug, 4 is a check valve unit, and 5 is a joint.

  The structure of each member will be described in detail with reference to FIG. 2 as an exploded sectional view. First, the main body 1 is provided with primary and secondary connection ports 1a and 1b at both ends in the horizontal direction. A seat 1d having a through hole 1c penetrating perpendicularly to the mouth axis of the primary side connection port 1a is formed, and a cylindrical valve chamber 1e is formed in the vertical direction on the secondary side of the through hole 1c. The upper end of the valve chamber 1e is opened to form an inlet 1f communicating with the valve chamber 1e. A packing groove 1g is formed on the inner periphery of the inlet 1f, and a female screw 1h is formed below the packing groove 1g. Has been established. In the present embodiment, the primary side connection port 1a and the secondary side connection port 1b are coaxially provided in the horizontal direction, but the secondary side flow path is located on the side of the valve chamber 1e inside the main body. It is bent 90 degrees downward. And by the said structure, the valve apparatus of this embodiment is applied to what is called a horizontal piping.

  The lid 2 detaches the valve chamber 1e from the inlet 1e of the main body 1 so that the valve chamber 1e can be hermetically sealed. And a male screw 2b that is screwed into the female screw 1h of the insertion port 1e, and a lower male screw 2c is engraved below the male screw 2b via a reduced diameter step portion. ing. Further, a concave portion 2d having the same diameter as the valve chamber 1e is formed on the lower surface of the body portion of the lid 2, and the valve chamber 1e is extended upward while the lid 2 is attached to the main body 1. The pressure relief plug 3 is formed as a screw that penetrates from the upper surface of the lid 2 to the recessed portion 2d and is screwed into a female screw hole 2e that allows the valve chamber 1e to communicate with the outside. The lid 2 can be attached and detached with an existing tool. For example, the lid 2 is provided with a square shaft 2f on the upper surface corresponding to a wrench or the like.

  Next, the check valve unit 4 is incorporated in the valve chamber of the main body 1 so as to be removable, and in this embodiment, a ball type check valve is adopted. In other words, the check valve unit 4 is configured such that the ball valve body 4b can be moved up and down in a cylindrical basket 4a whose upper and lower surfaces and side surfaces are opened to secure a flow path. In addition, a valve seat 4c of the valve body 4b is provided on the lower surface of the basket 4a, and the lower portion is configured to be watertightly fitted to the seat 1d of the main body 1. Further, an outward flange 4d is formed on the outer periphery of the upper end of the basket 4b.

  The joint 5 integrally connects the check valve unit 4 to the lower part of the lid 2 in the vertical direction. In this embodiment, the joint 5 is formed in a cap nut shape. That is, the joint 5 forms an inward flange 5a that can lock the outward flange 4d of the check valve unit 4 at the lower end of a cylindrical member having a knurled 6 formed on the outer periphery, and the lid 2 is formed in the center hole thereof. A female screw 5b is formed by engraving the lower male screw 2c. The center hole (female screw hole) of the joint 5 is set to a diameter through which the check valve unit 4 can be inserted except for the outward flange 4d.

  According to the check valve device having the above configuration, when the flow of the pipe is normal, the ball valve body 4b of the check valve unit 4 is lifted and detached from the valve seat 4c by the fluid pressure or buoyancy from the primary side. When the flow reverse to this occurs, the valve body 4b is seated on the valve seat 4c by secondary pressure or its own weight, thereby closing the through-hole 1c and preventing backflow. To do.

  And maintenance of this apparatus can be performed by the procedure shown in FIG. 3 without removing this apparatus from piping. That is, first, the primary side plug is closed to stop the flow of the piping, and the pressure relief plug 3 is removed from the lid 2 to release the sealed pressure in the apparatus (see FIG. 3A). Thereby, the removal operation of the next lid 2 is performed safely and easily. After releasing the sealing pressure in the apparatus, the lid 2 is turned using an existing tool, and the removal work from the main body 1 is performed (see FIG. 3B). At this time, since the check valve unit 4 is connected to the lid 2 by the joint 5, the removal operation of the check valve unit 4 from the main body 1 is completed simultaneously with the removal of the lid 2. In addition, when this apparatus is deeply embedded, the extension tool is appropriately connected to the tool, and the lid 2 is removed.

  To separate the check valve unit 4 from the removed lid 2, the joint 5 is turned to release the screwing with the lid 2 (see FIG. 3C). At this time, since the knurling 6 is provided on the outer periphery of the joint 5, the joint 5 can be detached from the lid 2 by hand without using a tool.

  Here, since the joint 5 and the check valve unit 4 are only locked by the flanges 4d and 5a, the check valve unit 4 can be easily pulled out from the joint 5 and disassembled in a short time. Is completed (see FIG. 3D).

  In this disassembled state, the main body 1 can be inspected through the insertion port 1e, and after checking various packings such as the O-ring of the lid 2 and the valve body of the check valve unit 4, they are replaced if necessary. Of course, this includes the check valve unit 4. And a member can be integrated in the main body 1 by the reverse procedure to the above.

  In the above embodiment, a ball type check valve is adopted as the check valve unit 4, but any other unit structure such as a spring type check valve that can open and close the through hole corresponding to the main body 1 can be used. It is also possible to adopt this valve configuration. Moreover, although the attachment structure with respect to the main body 1 of the lid | cover 2 was made into the screw type, if it is the structure which a lid | cover does not remove carelessly by an internal pressure etc., other attachment / detachment structures are also employable. Further, although the joint 5 is configured separately from the check valve unit 4, it can be integrated. In this case, the joint 5 may be integrally formed at one end of the basket of the check valve unit 4.

Assembly sectional view of a check valve device according to an embodiment of the present invention Exploded sectional view Explanatory drawing showing the disassembly procedure

Explanation of symbols

1 Body 2 Lid 3 Pressure Relief Plug 4 Check Valve Unit 5 Joint 6 Knurl

Claims (4)

A primary side and a secondary side connection port are provided in the horizontal direction, a valve chamber is formed in the secondary side in the vertical direction, and an upper end of the valve chamber is opened, and the opening is formed in the valve chamber of the main body. A check valve unit including a ball valve body that can be taken out via a lid, a lid for detachably opening the valve chamber so that the valve chamber can be sealed, and integrally connecting the lid and the check valve unit in a vertical direction. Consisting of joints,
The check valve unit is composed of a cylindrical basket having a flow path on the side surface and a valve seat provided at the lower end of the basket, and a ball valve body is accommodated in the basket.
In addition, the joint detachably connects the lid and the basket of the check valve unit,
The joint is configured as a cap nut with an inward flange formed on the inner periphery of the lower edge of the female screw hole through which the check valve unit can be inserted, while the check valve unit is connected to the upper edge of the basket. A check valve device characterized in that an outward flange that can be locked with the inward flange is provided, and a male screw that engages with the female screw hole of a joint is formed in the lower portion of the lid. . While bored valve chamber and capable of communicating pressure relief holes in the lid, the pressure relief check valve device of claim 1, wherein provided detachably plug into the hole. A primary side and a secondary side connection port are provided in the horizontal direction, a valve chamber is formed in the secondary side in the vertical direction, and an upper end of the valve chamber is opened, and the opening is formed in the valve chamber of the main body. A check valve unit including a ball valve body that can be taken out via a lid, a lid for detachably opening the valve chamber so that the valve chamber can be sealed, and integrally connecting the lid and the check valve unit in a vertical direction. Consisting of joints,
The check valve unit is composed of a cylindrical basket having a flow path on the side surface and a valve seat provided on the lower surface of the basket, and a ball valve body is accommodated in the basket.
A check valve device characterized in that a pressure relief hole capable of communicating with a valve chamber is formed in a lid, and a plug is detachably provided in the pressure relief hole . 4. The check valve device according to claim 3 , wherein the joint detachably connects the lid and the basket of the check valve unit.

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