JP2014031807A - Ball valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ball valve device incorporating a strainer, for allowing easy mounting/demounting of the strainer and reliable capture of foreign matters.SOLUTION: The ball valve device includes a ball valve element 3 stored in a valve box 2 and having a through-path 4. With the turn of the ball valve element 3, a flow path connecting an upstream side valve chest 5 and a downstream side valve chest 6 in the valve box 2 through the through-path 4 is opened/closed. On the upstream side valve chest 5 or the downstream side valve chest 6, a strainer mounting/demounting part 30 having an opening 38 connecting the inside and the outside of the valve box 2 is provided so that a strainer 20 can be mounted/demounted in/from the valve box 2 through the opening 38. In the strainer mounting/demounting part 30, there are provided a packing 32 for keeping a space between the strainer 20 and the opening 38 in a watertight manner and a cushion material 33 arranged between a cover body 31 closing the opening 38 and the strainer 20.

Description

  The present invention relates to a ball valve device incorporating a strainer.

  A strainer is installed at an appropriate location in the middle of a pipeline for transferring various fluids such as a water pipe. The strainer is for capturing foreign matters such as dust contained in a fluid such as water handled in the pipe line. This strainer may be provided alone in the middle of the pipeline, but may adopt a structure incorporated in various devices such as a ball valve device.

  An example of a ball valve device incorporating a strainer is shown in FIG. In this ball valve device 40, a through-passage 44 that connects an upstream (primary side) valve chamber 45 and a downstream (secondary side) valve chamber 46 is formed in a ball valve body 43 accommodated in the valve chamber. In addition, a strainer 47 made of a mesh member or the like is incorporated in a fixing portion 48 in the through passage 44.

  When the ball valve body 43 is rotated to open, the fluid passes from the upstream valve chamber 45 to the downstream valve chamber 46 and is contained in the fluid passing through the through-passage 44 of the ball valve body 43. Is captured by the strainer 47 (see, for example, Patent Documents 1 and 2).

JP 2000-46211 A JP 2008-169947 A

  According to the above ball valve device, when the strainer is cleaned or replaced with another one, the ball valve body 43 or the connection member of the valve box 42 on the insertion port side of the ball valve body 43 is used. It is necessary to remove (ball retainer) 41 and the like once. Such a detaching operation requires a special tool and is complicated.

  Further, as shown in FIGS. 5A and 5B, the strainer 47 is in the middle of rotating the ball valve body 43, that is, in the intermediate opening state between the valve open state and the valve close state. Fluid that does not pass through can be generated.

Explaining this point, for example, as shown by arrows a and b in FIG. 5A or arrows e and f in FIG. Can pass through.
However, a part of the fluid does not pass through the strainer 47 as indicated by arrows c and d in FIG. 5A or arrows g and h in FIG. The gas flows from the upstream valve chamber 45 to the downstream valve chamber 46 through the space between the primary valve seat 49a and the secondary valve seat 49b. For this reason, the situation where a foreign material is not captured may arise. Such a situation occurs both when the ball valve body 43 is shifted from the open state to the closed state and when the ball valve body 43 is shifted from the closed state to the open state.

  Accordingly, an object of the present invention is to make it easy to attach and detach the strainer and to reliably catch foreign matter in a ball valve device incorporating a strainer.

  In order to solve the above-described problems, the present invention is configured such that a through-passage is formed in a ball valve body housed in a valve box, and the valve box passes through the through-passage by rotation of the ball valve body. A flow path connecting the upstream valve chamber and the downstream valve chamber is opened and closed, and a strainer attaching / detaching portion having an opening connecting the inside and the outside of the valve box is provided in the upstream valve chamber or the downstream valve chamber. The strainer can be inserted into and removed from the valve box through the opening, and the strainer attaching / detaching portion includes a packing that holds the strainer and the opening in a watertight manner, a lid that closes the opening, and the strainer. A ball valve device characterized by being provided with a cushioning material disposed between the two is adopted.

  According to this configuration, the strainer can be taken in and out of the valve box through the strainer attaching / detaching portion provided in the upstream valve chamber or the downstream valve chamber. For this reason, when replacing the strainer or the like, it is not necessary to remove the ball valve body and complicated members around the ball valve body, and the operation is easy.

  Moreover, the strainer attaching / detaching portion is provided in the upstream side valve chamber or the downstream side valve chamber away from the ball valve body. For this reason, a foreign object can always be reliably captured regardless of the opening degree of the ball valve body.

  Furthermore, the strainer attaching / detaching portion is provided with a packing that holds the strainer and the opening in a watertight manner, and a cushion material that is disposed between the lid that closes the opening and the strainer. Therefore, fluid does not leak from the gap between the strainer inserted in the valve box and the opening of the valve box, and the strainer in the valve box vibrates or rattles. Can be reliably captured.

  According to the present invention, in a ball valve device incorporating a strainer, the strainer can be easily attached and detached, and foreign matter can be reliably captured regardless of the opening degree of the ball valve body.

1 shows an embodiment of the present invention, (a) is a cross-sectional plan view, (b) is a front cross-sectional view. (A) (b) is a perspective view of a strainer, (c) is a front sectional view of a valve box and a valve body, and (d) is a right side view. Another embodiment is shown, (a) is a plan sectional view, (b) is a front sectional view. FIG. 3 shows the embodiment of FIG. 3, (a) and (b) are perspective views of the strainer, (c) is a front sectional view of the valve box and the valve body, and (d) is a right side view. (A)-(c) is sectional drawing of a prior art example

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 (a) is a plan sectional view of the valve opening state showing this embodiment, and FIG. 1 (b) is a front view showing a valve closing state in which the ball valve body 3 is rotated 90 degrees from the state of FIG. 1 (a). It is sectional drawing.

  In this ball valve device 1, a through passage 4 connecting an upstream (primary side) valve chamber 5 and a downstream (secondary side) valve chamber 6 is formed in a ball valve body 3 accommodated in a valve box 2. Has been. A valve shaft 7 is connected to the ball valve body 3, and the valve shaft 7 is drawn out to the outside of the valve box 2 through a valve shaft support portion 10 provided so as to penetrate the inside and outside of the valve box 2. . An operation lever 8 is connected to the outer end of the valve shaft 7 by a nut 13. In the figure, reference numeral 11 denotes a valve shaft packing, and reference numeral 12 denotes a valve shaft bush.

  A ball retainer 15 is inserted from the outside into the upstream valve chamber 5 side of the valve box 2. The ball retainer 15 includes packings 14 a and 14 b on the outer surface thereof, and maintains water tightness with the inner surface of the valve box 2. Further, an annular valve seat (ball seat) 9a is provided at the end of the ball valve body 3 side (back side). An annular valve seat (ball seat) 9 b is also provided in the downstream valve chamber 6 of the valve box 2. The ball retainer 15 and the valve box 2 constitute a valve chamber that houses the ball valve body 3.

  The ball valve body 3 is received by the upstream and downstream valve seats 9a and 9b and is pressed by the ball presser 15 in the tube axis direction, that is, in the direction connecting the upstream side and the downstream side. . The valve seats 9a and 9b are at least in the opened state (refers to a completely opened state with an opening of 100%) and in the closed state (refers to a completely closed state with an opening of 0%). It can adhere to the outer surface of the ball valve body 3 over the entire circumference and maintain watertightness.

  By operating the operation lever 8 and rotating the valve shaft 7 around the axis, the ball valve body 3 rotates. The through passage 4 of the ball valve body 3 changes its direction by the rotation of the ball valve body 3, and the upstream valve chamber 5 and the downstream valve chamber 6 in the valve box 2 pass through the through passage 4 according to the direction. Can be opened and closed.

  The downstream valve chamber 6 is provided with a strainer attaching / detaching portion 30 having an opening 38 connecting the inside and outside of the valve box 2. The strainer 20 can be inserted into and removed from the valve box 2 through the opening 38 of the strainer attaching / detaching portion 30.

In this embodiment, since the ball retainer 15 is inserted into the upstream valve chamber 5, the strainer attaching / detaching portion 30 is provided in the opposite downstream valve chamber 6, but the ball retainer 15 is disposed in the downstream valve chamber 6. In the case where it is inserted in, the strainer attaching / detaching portion 30 may be provided in the upstream valve chamber 5.
However, even in the configuration in which the ball retainer 15 is inserted into the upstream valve chamber 5, the strainer attaching / detaching portion 30 may be provided in the upstream valve chamber 5 as long as the space can be secured. Even in the configuration in which the ball retainer 15 is inserted into the downstream valve chamber 6, the strainer attaching / detaching portion 30 may be provided in the downstream valve chamber 6 as long as the space can be secured.

  As shown in FIGS. 2A and 2B, the strainer 20 has a mesh member 23 attached to a central window portion 24 of a frame-like case 21 having a rectangular shape in a side view. In this embodiment, the window portion 24 is rectangular in a side view, but this shape can be freely set.

  The case 21 is composed of a frame material having a U-shaped cross section, and the window portions 24 are provided on both front and back sides of the frame material. In this embodiment, since the strainer 20 is provided in the downstream valve chamber 6, the mesh member 23 is desirably attached to the far side from the ball valve body 3 in the window portions 24 on both sides of the front and back. This is because the receiving portion 25 formed inside the case 21 having a U-shaped cross section functions as a foreign matter reservoir. If the strainer 20 is provided in the upstream valve chamber 5, for the same reason, the mesh member 23 is preferably attached to the side close to the ball valve body 3 in the front and back windows 24.

  The strainer 20 can be easily put into and out of the valve box 2 through the opening 38 by hooking a pin or the like on a locking portion (drawing hole) 22 provided in the case 21.

  As shown in FIG. 2 (d), the lid 31 is placed on a flange portion 37 provided in the valve box 2, and a bolt 34 is attached to a locking portion (screw hole) 36 provided in the flange portion 37. Is fixed by screwing. By tightening the bolts 34, the case 21 of the strainer 20 comes into close contact with the bottom surface 35 of the valve box 2 and is fixed in a stable state.

  Further, the strainer attaching / detaching portion 30 includes a packing 32 that holds the space between the case 21 of the strainer 20 inserted into the valve box 2 and the opening 38 in a watertight manner, and a lid 31 and a strainer that close the opening 38. The cushion material 33 arrange | positioned between 20 cases 21 is provided. The packing 32 covers the entire gap between the case 21 and the opening 38 along the edge of the opening 38, and is a material that exhibits the function of stopping water inside and outside the valve box 2. The cushion material 33 is a sheet-like member provided on the entire pressing surface of the case 21 (surface on the lid 31 side), and an elastic member such as rubber can be employed.

  As a result, fluid does not leak from the gap between the strainer 20 inserted into the valve box 2 and the opening 38 of the valve box 2, and the strainer 20 in the valve box 2 vibrates. It is possible to prevent the occurrence of rattling and always reliably capture foreign matter. In addition to or instead of the cushion material 33 on the lid 31 side, a cushion material may be disposed on the bottom surface 35 side of the valve box 2.

  The replacement work of the strainer 20 will be described. First, the bolts 34 of the lid 31 are loosened, and the lid 31 is removed. A pin or the like is hooked on the locking portion 22 of the case 21, and the strainer 20 is pulled out of the valve box 2. At this time, the packing 32 and the cushion material 33 are also taken out simultaneously.

  The cleaned strainer 20 or a new strainer 20 prepared separately is inserted into the valve box 2 through the opening 38. This insertion can also be performed by hooking a pin or the like on the locking portion 22. Covering the packing 32 and the cushion material 33 and fixing the lid 31 with the bolts 34, the replacement of the strainer 20 is completed. At this time, it is desirable to replace the packing 32 and the cushion material 33 with new ones.

As described above, the strainer 20 is inserted into and removed from the valve box 2 through the strainer attaching / detaching portion 30 provided in the upstream valve chamber 5 and the downstream valve chamber 6 without interfering with the ball valve body 3 and the valve seats 9a and 9b. It is free. This is because the strainer attaching / detaching portion 30 is located on the outer side (the side farther from the ball valve body 3) than the valve seats 9a, 9b.
That is, when replacing the strainer 20 or the like, it is not necessary to remove the ball valve body 3 or complicated members around the ball valve body 3, and it is not necessary to use a special tool. In addition, for example, even if the piping installation place is narrow, the workability is excellent.

  Further, a strainer attaching / detaching portion 30 to which the strainer 20 can be attached is provided in the upstream side valve chamber 5 and the downstream side valve chamber 6 apart from the ball valve body 3. For this reason, a foreign object can always be reliably captured regardless of the opening degree of the ball valve body 3. Since the strainer attaching / detaching portion 30 is located on the outer side (the side far from the ball valve body 3) from the valve seats 9a, 9b, all the fluid passes through the strainer 20 regardless of the opening degree of the ball valve body 3. Because it does.

  Another embodiment is shown in FIGS. In this embodiment, the direction of the opening 38 of the strainer attaching / detaching portion 30 is turned upside down. That is, in the above-described embodiment, the opening 38 of the strainer attaching / detaching portion 30 faces upward, and the strainer 20 can be inserted into and removed from the valve box 2 from above. On the other hand, in this embodiment, the opening 38 of the strainer attaching / detaching portion 30 faces downward, and the strainer 20 can be inserted into and removed from the valve box 2 from below.

  In general, foreign matter tends to stay near the strainer 20, and the foreign matter tends to accumulate near the bottom surface 35 of the valve box 2. For this reason, as described above, by allowing the strainer 20 to be extracted downward, foreign matter accumulated in the valve box 2 can be discharged together with the strainer 20 to the outside of the valve box 2. In addition, if the direction of this opening part 38 is made into the side, the strainer 20 can also be made possible with respect to the valve box 2 to the side.

1,40 Ball valve device 2,42 Valve box 3,43 Ball valve element 4,44 Through passage 5,45 Upstream valve chamber (primary valve chamber)
6,46 Downstream valve chamber (secondary valve chamber)
7 Valve shaft 8 Operation lever 9a, 9b, 49a, 49b Valve seat (ball seat)
DESCRIPTION OF SYMBOLS 10 Valve shaft support part 11 Valve shaft packing 12 Valve shaft bush 13 Nut 14a, 14b Packing 15, 41 Ball presser 20, 47 Strainer 21 Case 22 Locking part (extraction hole)
23 Mesh member 24 Window portion 25 Receiving portion 30 Strainer attaching / detaching portion 31 Cover body 32 Packing 33 Cushion material 34 Bolt 35 Bottom surface 36 Locking portion (screw hole)
37 Flange 38 Opening 48 Fixed

Claims (1)

  A through passage (4) is formed in the ball valve body (3) accommodated in the valve box (2), and the ball valve body (3) is rotated through the through passage (4). A flow path connecting the upstream valve chamber (5) and the downstream valve chamber (6) in the valve box (2) opens and closes, and the upstream valve chamber (5) or the downstream valve chamber (6) A strainer attaching / detaching portion (30) having an opening (38) connecting the inside and the outside of the valve box (2) is provided, and the strainer (20) can be taken into and out of the valve box (2) through the opening (38). The strainer attaching / detaching portion (30) includes a packing (32) for holding the space between the strainer (20) and the opening (38) in a watertight manner and a lid (31) for closing the opening (38). And a cushioning material (33) disposed between the strainer (20) and the strainer (20). Ball valve device to be.

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