JPH11325282A - Check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To select an elasticity supplying means for rapidly closing a valve element without increasing a cost, and facilitate maintenance of such means by separably arranging a valve shaft outside a valve box, and selectively arranging the elasticicity supplying means. SOLUTION: A valve shaft 5 is composed of a valve rod 5 inside a valve box 2, and an auxiliary valve shaft 51 connected to a main valve shaft 50. A diametral recession is formed on a connection part of the main valve shaft 50, which a projection is formed on the auxiliary valve shaft 51 so as to fit to the recession. The auxiliary valve shaft 51 is detachably supported to the valve box 2 coaxially with the main valve shaft 50 by fixing a seal ring case 7 to the valve box 2 by means of proper numbers of bolts 8. A spring unit 12 and a sensor unit are attached to such a valve afterward. Inspection and replacement can be performed without stopping fluid flow, even when failure occurs at one of the units.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve shaft extending outside a valve box, and elastically rotating the valve shaft outside the valve box in the direction in which the valve element is seated on a valve seat. The present invention relates to a quick closing type check valve provided with an elastic biasing means for biasing.

[0002]

2. Description of the Related Art Conventionally, for example, a non-return valve arranged in the middle of a water supply pipe line is required to prevent backflow and water hammer.
In order to quickly close the check valve, it is common to provide an elastic biasing means having a spring. In this case, when the liquid flowing in the water pipe is sewage or corrosive liquid, it is not possible to provide elastic biasing means inside the valve, so the valve stem is extended outward and the valve box is closed. Elastic biasing means is mounted externally on the extension of the valve stem. This is referred to as an exterior spring type quick closing check valve, which is currently in active use. However, when the water pressure is high in the above check valve, it is required to use a spring quick closing type, but in the case of a check valve used in a water passage having a relatively low water pressure, it is not necessary to use the spring quick closing type. .

[0003]

However, the above-mentioned check valve is usually manufactured only by a quick spring closing type, and for a user who does not need the quick spring closing type, a check valve which is more expensive must be used. I had to. Further, when a check valve that is not of the spring quick closing type is manufactured, a separate part is required for such a valve, and if the manufacture is small in number, it is rather expensive.

Further, in the conventional exterior spring type quick closing check valve, if the spring part fails, there is a problem that the water supply passage must be stopped until the failure is corrected. The present invention solves the conventional problem described above, and can select the equipment of the elasticity applying means for rapidly closing the valve element without increasing the cost, and can easily fix even if the elasticity applying means breaks down. It is intended to provide a check valve that can be used.

[0005]

In order to achieve the above object, the present invention extends a valve stem to the outside of a valve box, and a valve body seats on a valve seat of the valve shaft outside the valve box. A rapidly closing check valve equipped with an elastic urging means for elastically urging a rotational force in a rotating direction, wherein the valve shaft is divided so as to be separable outside a valve box, and the elastic urging means is Is characterized by being able to be selectively equipped.

Further, in order to achieve the above-mentioned object, the present invention provides a valve shaft extending outside a valve box, in which a valve body is seated on a valve seat against one end of the valve shaft outside the valve box. And a detecting means provided at the other end of the valve shaft outside the valve box to detect an open / closed state of the valve element. In a closed check valve, both ends of the valve shaft are separated so as to be separable outside the valve box, and the elastic biasing means and the detecting means can be selectively provided.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an explanatory sectional view of a check valve according to the present invention.

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 rod 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 at a portion protruding outside the valve box 2 outside the bearing bush 6. Is fixed to the valve box 2 by an appropriate number of bolts 8.

Further, a spring mount 10 is provided on the valve stem 5 outside the sealing case 7, and the spring mount 10 is fixed to the valve box 2 by bolts 11. Further, a spring unit 12 as an elastic urging means is mounted on the spring mounting base 10. The spring unit 12 includes the spring mount 10.
, A pair of pins 14 and 15 provided near both ends of the spring base 13, and a spring lever arm 1 fixed to the valve stem 5 by screws 16.
7, pins 18 and 19 protruding from both ends of the spring lever arm 17, and a spring 20 and a spring base which are hooked and suspended between the pin 14 of the spring base 13 and the pin 18 of the spring lever arm 17. 13 pin 15
And a spring 21 which is engaged with the pin 19 of the ring lever arm 17 and is suspended therefrom. The springs 20 and 21 are connected to the pins 14, 15, 18 and 19 and the bearing 2.
2 are locked. The spring unit 12 is formed symmetrically about the axis of the valve stem 5.

The two springs 1 are tension springs, which cooperate to rotate the spring lever arm 17 counterclockwise. Therefore, a counterclockwise rotational moment is applied to 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,
It acts to seat the valve body 3 on its valve seat.

FIG. 4 shows the spring unit 12 of the valve stem 5.
FIG. 4 is a cross-sectional view showing a side opposite to the side on which the spring unit 12 is provided. A sealing case 7 in which an O-shaped packing ring 9 is inserted is provided on a portion of the valve stem 5 protruding outward of the valve box 2 outside the bearing bush 6,
Further, a sensor unit 30 for detecting the open / closed state of the valve element 3 is provided outside the sealing case 7 on the valve stem 5. 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 3 for detecting the detection piece 31 when the valve body 3 is opened and the valve shaft 5 rotates.
And 2. That is, the check valve 1 of this embodiment is provided with the spring unit 12 at one end of the valve shaft 5 and the sensor unit 30 at the other end.

By the way, the above-mentioned spring unit 1
2 and the sensor unit 30 include a user who needs it and a user who does not. However, since there are many users who need both units, a valve provided with both units in advance is manufactured, and for a user who does not need the unit, a cost for an unnecessary function is added. For this reason, as described above, if a valve without both units is requested, it will be a kind of custom-made, which will be rather expensive.

Therefore, in the present invention, as shown in FIG. 2 and FIG.
Main valve shaft 5 and an auxiliary valve shaft 5 connected to the main valve shaft 50.
1 and 52. 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 sub valve shaft 51,
The projection 52 is formed on the projection 52 so as to fit into the depression 53. The auxiliary valve shafts 51 and 52 are detachably supported on the valve box 2 so that the sealing case 7 is fixed to the valve box 2 with an appropriate number of bolts 8 so that the main valve shaft 50 coincides with the axis. I have. The main valve shaft 50 and the sub valve shafts 51, 52
The shape of the joint may be an arbitrary uneven shape, and may be, for example, a + shape, a × shape, or the like. However, it is preferable that the sub-valve shafts 51 and 52 have the same shape, so that not only the manufacturing cost is reduced, but also when only one unit is used, the position to be attached can be either left or right. can do.

In the valve configured as described above, since the spring unit 12 and the sensor unit 30 are attached to the valve later, it becomes possible for an unnecessary user to sell the valve with both units removed. It can be provided at low cost. Further, in a valve provided with both units, even if a failure or the like occurs in either unit, the valve itself functions, so that inspection, replacement, etc. can be performed without removing the unit and stopping the fluid. .

[0015]

According to the structure of the first and second aspects, the equipment of the spring unit and the sensor unit can be freely selected, and the inspection and replacement of the unit can be easily performed.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view of a quick-close check valve using a spring according to the present invention.

FIG. 2 is a sectional view showing a spring unit of the check valve according to the present invention.

FIG. 3 is a front view showing a spring unit of the check valve according to the present invention.

FIG. 4 is a sectional view showing a sensor unit of the check valve according to the present invention.

FIG. 5 is a front view showing a sensor unit of the check valve of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Check valve 2 Valve box 3 Valve element 5 Valve rod 12 Spring unit 30 Sensor unit 50 Main valve shaft 51, 52 Secondary valve shaft

Claims (2)

[Claims] 1. A resilient biasing means for extending a valve shaft to the outside of a valve box and for resiliently biasing a rotational force in a direction in which a valve body is seated on a valve seat with respect to the valve shaft outside the valve box. In the quick closing type check valve provided with a means, the valve shaft is divided so as to be separable outside the valve box, and the elastic biasing means can be selectively provided on the separated valve shaft. A check valve. 2. A resilient mechanism for extending a valve shaft to the outside of a valve box, and for resiliently biasing a rotating force in a direction in which a valve body is seated on a valve seat against one end of the valve shaft outside the valve box. A quick closing check valve provided with an urging means and a detecting means provided at the other end of the valve shaft outside the valve box and detecting an open / closed state of the valve element; A check valve, wherein both ends are separably separated outside a valve box, and the elastic biasing means and the detecting means can be selectively provided on each of the separated valve shafts.