JP4113415B2 - Long spindle butterfly valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a long spindle butterfly valve, and more particularly to a long spindle butterfly valve that is suitably used for embedding.
[0002]
[Prior art]
For example, as shown in FIG. 3, a conventional butterfly valve has a valve stem 8 rotatably attached to the valve box 1 in the vertical direction, and a valve body 2 is attached to the valve stem 8. The valve body 1 is rotatably accommodated, and the valve body 2 is opened and closed by the rotation. The long spindle butterfly valve is obtained by extending the length of the valve stem 8 by connecting a long spindle to the upper end portion of the valve stem 8. For example, as disclosed in Patent Document 1, Used for burial and other purposes.
[0003]
Since the long spindle butterfly valve has a long long spindle (hereinafter also referred to as “extension valve rod”), an excessive load is applied to the valve box when an external force such as ground fluctuation is applied. There was a problem that it was easy.
[0004]
In order to solve such a problem, in Patent Document 1, a cylindrical valve box has a vertical axis that intersects the horizontal axis of the valve box, and a valve shaft is rotatably supported. The valve body attached to the valve body is accommodated in the valve box so as to be rotatable around its axis together with the valve stem, and is configured to open and close the valve box by the rotation. The upper end of a spindle having a vertical axis that is connected to the lower end so as to be capable of simultaneous rotation is rotatably positioned inside a valve pad embedded near the ground surface, and the spindle is interposed between the valve box and the valve pad. In the underground long spindle butterfly valve that is inserted into a cylindrical stand that connects the valve rod outlet of the valve box and the lower end opening of the valve, the cylindrical stand is connected to the valve stem outlet. Connected valve box side short pipe, It consists of a valve-side short pipe connected to the lower end opening of the valve and a main pipe connecting them together, and the main pipe, the valve box-side short pipe and the valve-side short pipe are at one end. There is disclosed a buried underground long spindle butterfly valve that is connected to each other by a socket joint in which a small-diameter insertion port at the other end is inserted into a formed large-diameter receiving port.
[0005]
However, in the long spindle butterfly valve as described above, since the lower end of the long spindle is only connected to the valve stem so as to be able to rotate simultaneously through the coupling, the weight of the extension valve stem itself is the valve of the butterfly valve body. Due to the structure that can be loaded on the rod, there is a problem that the valve body of the butterfly valve falls from a predetermined position when it falls downward, and the compression with the seat ring becomes uneven in the vertical direction and adversely affects the water stoppage. In particular, when the valve body and the valve body are made of a synthetic resin, the adverse effect is large.
[0006]
[Patent Document 1]
JP 2002-48265 A (page 3, FIG. 1)
[0007]
[Problems to be solved by the invention]
An object of the present invention is to solve the problems of the conventional long spindle butterfly valve described above, and to reduce the load on the valve body of the butterfly valve due to the weight of the extension valve rod itself, and to suppress the adverse effect on water stoppage. To provide a valve.
[0008]
[Means for Solving the Problems]
The long spindle butterfly valve according to claim 1 is a valve box, a seat ring mounted on an inner periphery of the valve box, a valve rod penetrating the seat ring and supported by the valve box, and the valve rod A valve body that opens and closes a fluid passage formed by a seat ring in the valve box by rotating with the rotation of the valve stem, and a load receiving means on the upper portion of the valve box so as to be rotatable simultaneously with the valve stem. A long spindle butterfly valve consisting of an extension valve rod to which the lower end is connected,
The load receiving means includes a load receiving spacer disposed at a flange portion inner edge of the upper portion of the valve box with a clearance provided between the upper surface of the shoulder of the valve stem , and a thrust bearing disposed on the upper surface of the load receiving spacer. And a gap is provided between the upper end of the insertion portion of the valve stem inserted into the lower end portion of the extension valve stem and the upper surface of the insertion space portion of the extension valve stem. And
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a half sectional view showing an example of a long spindle butterfly valve according to the present invention.
FIG. 2 is a partially enlarged half sectional view showing an example of a load receiving structure in the long spindle butterfly valve according to the present invention.
[0010]
As illustrated in FIG. 1, the long spindle butterfly valve of the present invention includes a valve box 1, a seat ring 13 mounted on the inner periphery of the valve box, and a valve that is supported by the valve box 1 through the seat ring. A valve body 2 fixed to an intermediate portion of the valve rod 8 and rotating with the rotation of the valve rod 8 to open and close the circular fluid passage formed by the seat ring 13 in the valve box; A long spindle butterfly valve comprising an extension valve rod 9 connected to the upper part of the valve box so as to be capable of simultaneous rotation. As a load receiving means, as shown in an enlarged view in FIG. A lower end portion of the extension valve stem 9 is provided via a load receiving member 11 composed of the provided load receiving spacer 10 and the thrust bearing 7 so that the load of the extension valve stem 9 is not applied to the valve stem 8. Between the upper end of the rod 8 and the load receiving spacer 10 In which gaps are connected is provided.
[0011]
The valve box 1 is made of, for example, PVC or GFPP (glass fiber reinforced PP), the seat ring 13 is made of EPDM or EPM, the extension valve rod 9 is made of SUS304 or SUS316, and the valve body 2 is made of PP or the like.
[0012]
A sliding plate having a high sliding property such as a fluororesin thin plate is fitted in the contact portion of the upper and lower planar ring-shaped seat rings 13 which are both axial ends of the valve stem 8 in the valve body 2. Also good.
[0013]
Further, in the above, if the outer peripheral shape of the valve body 2 is an ellipse having a minor axis in the direction perpendicular to the axis of the valve stem 8, the operating torque is reduced and the wear of the seat ring 13 due to repeated opening and closing is reduced. preferable.
[0014]
When the outer peripheral shape of the valve body 2 is an ellipse having a minor axis in the direction perpendicular to the valve stem axis, both ends of the valve body 2 in the direction perpendicular to the valve stem axis compress and slide the seat ring 13 when the valve is closed. The operating torque can be reduced and the wear of the seat ring 13 due to repeated opening and closing can be reduced while ensuring sufficient sealing performance without increasing the compression rate so much.
[0015]
Moreover, the both ends of the height direction which is the valve-shaft axial direction of the valve body 2 are the parts which always compress the seat ring 13, Comprising: The required high compression rate is always ensured and sufficient sealing performance is ensured. Secured. At this time, when the seat ring 13 is compressed to both ends of the valve body 2 in the height direction, which is the axial direction of the valve stem, via a sliding plate such as a thin plate made of fluororesin, for example, the high compression as described above. It is further preferable in that the sliding resistance can be reduced while ensuring the rate, and the wear of the seat ring 13 due to repeated opening and closing can be reduced.
[0016]
Among them, it is preferable to use the thrust bearing 7 and the load receiving spacer 10 as the load receiving member 11. The thrust bearing 7 is preferable in terms of smoothing the rotation of the valve stem, and the load receiving spacer 10 applies the weight of the extension valve stem 9 to the valve casing 1 instead of the valve stem 8 so that the valve stem 8 (valve It is preferable in terms of preventing the body 2) from dropping, receiving deformation of the thrust bearing 7 on the surface, and easily adjusting the thickness interval of the load receiving member. For this reason, it is preferable that the material of the load receiving spacer 10 is the same material as that of the extension valve rod 9, and for example, SUS304, SUS316 or the like is preferably used.
[0017]
The length of the extension valve stem 9 is not particularly limited, but it is preferably 1 m or more from the viewpoint that the effects of the present invention can be more reliably exhibited.
[0018]
【The invention's effect】
According to the long spindle butterfly valve of the present invention, a load receiving spacer disposed at the flange inner edge of the upper portion of the valve box with a clearance provided between the upper surface of the shoulder of the valve stem and the upper surface of the load receiving spacer. and have a load receiving means of the extension valve rod comprising a thrust bearing, and the upper end of the insertion portion of the valve stem which is inserted into the lower end of the extension stem, the insertion space of the extension stem Since the gap is provided between the upper surface and the valve body of the butterfly valve, it can be prevented that the butterfly valve is displaced from a predetermined position and adversely affects the water stop, and problems such as water leakage are less likely to occur.
[0019]
Furthermore, the length of the extension valve rod can be made longer than before, and for example, it is possible to construct deeper in the ground.
[Brief description of the drawings]
FIG. 1 is a half sectional view showing an example of a long spindle butterfly valve according to the present invention.
FIG. 2 is a partially enlarged half sectional view showing an example of a load receiving structure in a long spindle butterfly valve according to the present invention.
FIG. 3 is a half cut sectional view showing an example of a conventional butterfly valve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Valve box 2 Valve body 3 Handle 4 Segment gear 5 Worm gear 6 Protective tube 7 Thrust bearing 8 Valve rod 9 Extension valve rod 10 Load receiving spacer 11 Load receiving member (load receiving means)
12 Flange 13 Seat ring 14 O-ring

Claims (1)

A valve box, a seat ring mounted on the inner periphery of the valve box, a valve rod that passes through the seat ring and is supported by the valve box, and is fixed to an intermediate portion of the valve rod, and rotates the valve rod A valve body that rotates with and opens and closes a fluid passage formed by a seat ring in the valve box, and an extension in which the lower end portion of the valve box is connected to the upper part of the valve box so as to be rotatable simultaneously with the valve rod via a load receiving means. A long spindle butterfly valve consisting of a valve stem,
The load receiving means includes a load receiving spacer disposed at a flange portion inner edge of the upper portion of the valve box with a clearance provided between the upper surface of the shoulder of the valve stem , and a thrust bearing disposed on the upper surface of the load receiving spacer. And a gap is provided between the upper end of the insertion portion of the valve stem inserted into the lower end portion of the extension valve stem and the upper surface of the insertion space portion of the extension valve stem. Long spindle butterfly valve.

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