JP4177915B2 - Check valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides an elastic biasing means for elastically biasing the turning force in the direction in which the valve body is seated on the valve seat with respect to the valve shaft outside the valve box, extending the valve shaft to the outside of the valve box. It relates to a quick-close type check valve equipped with
[0002]
[Prior art]
Conventionally, for example, a check valve disposed in the middle of a water supply pipe is equipped with an elastic biasing means having a spring in order to close the check valve rapidly in order to prevent backflow and water hammer. Is common. In this case, when the liquid flowing in the water pipe is dirty water or corrosive liquid, it is not possible to provide elastic urging means inside the valve. An elastic biasing means is attached to the extension of the valve stem outside. This is called an exterior spring type quick-closed check valve, and it is currently in active use. However, in the case of the above check valve, when the water pressure is high, it is required to use a spring rapid closing type. However, in the check valve used in a water supply passage having a relatively low water pressure, it is not necessary to use the spring rapid closing type. .
[0003]
[Problems to be solved by the invention]
However, the above-mentioned check valve is usually manufactured only with a spring quick-close type, and a user who does not need the spring quick-close type has to use a check valve with higher cost. In addition, when a check valve that is not a spring rapid closing type is manufactured, a separate part is required for such a valve, and if the number of manufactured parts is small, the check valve is rather expensive.
[0004]
Further, in the conventional exterior spring type quick-close check valve, when the spring portion fails, there is also a problem that the water supply path must be stopped until the failure is corrected.
The present invention eliminates the above-mentioned conventional problems, allows the selection of equipment for elasticity applying means for rapidly closing the valve body without increasing the cost, and can be easily corrected even if the elasticity applying means fails. It aims to provide a check valve that can be used.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention extends a valve shaft to which a valve body is fixed to a position where the valve body appears outside the valve box, and the valve body is located outside the valve box with respect to one end of the valve shaft. A spring unit that elastically biases the rotational force in the direction of seating on the valve seat; and provided at the other end of the valve shaft outside the valve box, and opens and closes the valve body from the rotation of the valve shaft. In the check valve that can be selectively attached to the sensor unit to detect, the spring unit and the sensor unit are provided with a sub-valve shaft that can be connected to an end of the valve shaft,
When the spring unit and the sensor unit are mounted on the check valve, the auxiliary valve shaft is connected to the end of the valve shaft, and the spring unit and the sensor unit are fixed to the valve box. We propose a check valve characterized by
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is an explanatory cross-sectional view of a check valve according to the present invention.
[0008]
In FIG. 1, reference numeral 1 is a check valve, 2 is its valve box, and 3 is a valve body. As shown in FIGS. 1 to 3, a valve body arm (not shown) formed on the valve body 3 is fixed to the valve body 5. The valve stem 5 is mounted on the valve box 11 by a bearing bush 6 so as to be rotatable and movable in the axial direction. The valve stem 5 is provided with a sealing case 7 in which an O-shaped packing ring 9 is inserted in a portion protruding outward of the valve box 2 outside the bearing bush 6. Is fixed to the valve box 2 by an appropriate number of bolts 8.
[0009]
Further, the valve stem 5 is provided with a spring mount 10 on the outside of the sealing case 7, and the spring mount 10 is fixed to the valve box 2 with bolts 11. A spring unit 12 as an elastic urging means is attached to the spring mounting base 10. The spring unit 12 includes a spring base 13 fixed to the spring mounting base 10, pins 14 and 15 provided near both ends of the spring base 13, and a spring lever arm 17 fixed to the valve stem 5 with a screw 16. The springs 20 and the spring base 13 are engaged with the pins 18 and 19 projecting from both ends of the spring lever arm 17, the pin 14 of the spring base 13 and the pin 18 of the spring lever arm 17. It has a pin 21 and a spring 21 that is hooked and held on the pin 19 of the ring lever arm 17. The springs 20 and 21 are locked via the pins 14, 15, 18 and 19 and the bearing 22. The spring unit 12 is formed in a symmetrical shape with the axis of the valve stem 5 as the center.
[0010]
The two springs 1 are tension springs, and both act together to rotate the spring lever arm 17 counterclockwise. Therefore, a counterclockwise rotational moment is exerted on the valve stem 5, and this spring force is transmitted to the valve body 3 via the valve stem 5 and the valve body arm, and acts to seat the valve body 3 on the valve seat. .
[0011]
FIG. 4 is a cross-sectional view showing the side opposite to the side where the spring unit 12 of the valve stem 5 is provided, and the valve shaft 5 is attached to the valve box 11 by the bearing bush 6 on the side opposite to the side where the spring unit 12 is provided. It is mounted so that it can rotate. The valve stem 5 is provided with a sealing case 7 in which an O-shaped packing ring 9 is inserted in a portion projecting outward of the valve box 2 outside the bearing bush 6. 5, a sensor unit 30 for detecting the open / closed state of the valve body 3 is provided outside the sealing case 7. As shown in FIG. 5, the sensor unit 30 includes a fan-shaped detection piece 31 fixed to the valve shaft 5 and a sensor 32 that detects the detection piece 31 when the valve body 3 is opened and the valve shaft 5 rotates. is doing. That is, the check valve 1 of this embodiment is equipped with a spring unit 12 on one end side of the valve shaft 5 and a sensor unit 30 on the other end side.
[0012]
Incidentally, there are users who need the spring unit 12 and the sensor unit 30 described above and users who do not need it. However, since there are many users who require both units, a valve with both units attached in advance is manufactured, and costs for functions that are unnecessary for users who do not need the unit are added. For this reason, if a valve without both units is requested, it will be a kind of custom-made, so it will be expensive.
[0013]
Therefore, in the present invention, as shown in FIG. 2 and FIG. 4, the valve shaft 5 is cut at the position where it exits the valve box 2, and the valve shaft 5 is connected to the main valve shaft 5 in the valve box 2 and the main valve shaft 50. The auxiliary valve shafts 51 and 52 are configured. In this case, the connecting portion of the main valve shaft 50 is formed with a concave portion 53 in the diameter direction, and the auxiliary valve shafts 51 and 52 are formed with a convex portion 54 that fits into the concave portion 53. The auxiliary valve shafts 51 and 52 are supported by the valve case 2 so that the shaft case coincides with the main valve shaft 50 by fixing the sealing case 7 to the valve case 2 with an appropriate number of bolts 8. Yes. In addition, the shape of the joint portion between the main valve shaft 50 and the sub valve shafts 51 and 52 may be an arbitrary uneven shape, and may be, for example, a + shape or an X shape. However, it is preferable that the sub-valve shafts 51 and 52 have the same shape. If configured in this way, not only the manufacturing cost is reduced, but also when only one unit is used, either the left or right position is selected. can do.
[0014]
Since the spring unit 12 and the sensor unit 30 are attached later to the valve, the valve configured as described above can be sold with both units removed for an unnecessary user, and the valve can be inexpensively manufactured. Can be provided. Furthermore, in a valve provided with both units, even if a failure or the like occurs in any unit, the valve itself functions, so that inspection, replacement, etc. can be performed without removing the unit and stopping the fluid. .
[0015]
【The invention's effect】
According to the configuration of the first aspect , the installation of the spring unit and the sensor unit can be freely selected, and the unit can be easily inspected and replaced.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a cross-sectional explanatory view of a quick check valve using a spring according to the present invention.
FIG. 2 is a cross-sectional view showing a spring unit portion of the check valve of the present invention.
FIG. 3 is a front view showing a spring unit portion of the check valve of the present invention.
FIG. 4 is a cross-sectional view showing a sensor unit portion of the check valve of the present invention.
FIG. 5 is a front view showing a sensor unit portion of the check valve of the present invention.
[Explanation of symbols]
1 Check Valve 2 Valve Box 3 Valve Body 5 Valve Rod 12 Spring Unit 30 Sensor Unit 50 Main Valve Shaft 51, 52 Sub Valve Shaft

Claims (1)

The valve shaft with the valve body fixed is extended to the position where it appears outside the valve box, and the rotational force in the direction in which the valve body is seated on the valve seat is elastic with respect to one end of the valve shaft outside the valve box. a spring unit for biased, provided at the other end of the valve shaft in the valve body outside and which can be selectively mounted sensor unit for detecting the open or closed state of the valve body from the rotation of the valve shaft In the check valve,
The spring unit and the sensor unit are provided with a sub-valve shaft connectable to an end of the valve shaft,
When the spring unit and the sensor unit are mounted on the check valve, the auxiliary valve shaft is connected to the end of the valve shaft, and the spring unit and the sensor unit are fixed to the valve box. Check valve characterized by.

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