JP2008169905A - Flow amount reader and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To read a valve opening from a valve opening indicator and find a flow amount at a rough estimate from the valve opening and a flow amount property curve on specifications, thus solving problems in which troublesome work is required for checking a flow amount, as well as an accurate flow amount can not be grasped. <P>SOLUTION: On a valve body 10, there are provided an indicator 15 to be moved in linkage with the displacement of a valve rod 11 and a valve opening indicating dial 1 for allowing the opening of a valve element 12 to be read from the position of the indicator 15. The valve opening indicating dial 1 has a flow amount scale 3 corresponding to the valve opening in accordance with the flow amount property of the valve element 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a flow rate reading device that reads a flow rate of a fluid corresponding to the opening of a valve body, and a manufacturing method thereof.

  Conventionally, the valve opening degree of the flow control valve installed in the pipe line is confirmed by the position of the valve rod or the opening degree indication device. On the other hand, the flow rate of the fluid is confirmed by an instruction of a flow rate transmitter installed in the pipeline separately from the flow rate control valve. The opening degree indicating device includes a moving member that moves together with the valve rod, a pointer that rotates around the fulcrum pin as the moving member moves to increase the amount of movement of the valve rod, and this pointer. There is known one provided with an opening instruction scale for converting the amount of rotation into the opening of the valve body and reading it (for example, see Patent Document 1).

Japanese Utility Model Publication No. 5-47661

  However, the flow rate confirmation in the place where the flow rate transmitter is not installed is based on the flow rate characteristic curve described in the valve opening and the corresponding valve specifications etc. The flow rate had to be calculated roughly. For this reason, not only is the flow rate confirmation work complicated, but the actual flow characteristics may differ from the flow characteristic curves described in the valve specifications depending on the usage conditions such as the flow rate. There was a problem of not being able to grasp.

  Therefore, in order to solve the above problems, the present invention includes a pointer that moves in conjunction with the amount of movement of the valve stem in the valve body, and a valve opening indication scale that reads the opening of the valve body from the position of the pointer. Provided is a flow rate reading device provided with a flow rate scale corresponding to the valve opening degree on the valve opening degree indicating scale plate based on the flow rate characteristic of the valve element.

  Moreover, this invention measured the flow volume in the several valve opening degree of the said valve body with a flowmeter, and calculated | required the flow volume characteristic of the said valve body from the relationship between the measured flow volume and valve opening degree. A reading device is provided.

  The present invention also provides a flow meter in a valve body provided with a pointer that moves in conjunction with the amount of movement of the valve stem of the valve body, and a valve opening indication scale that reads the opening of the valve body from the position of the pointer. Means for measuring the flow rate at a plurality of valve openings of the valve body, means for determining the flow characteristic of the valve body from the relationship between the measured flow rate and the valve opening, and the valve opening instruction based on the flow characteristic The present invention provides a method for manufacturing a flow rate reading device comprising means for marking a flow rate scale corresponding to a valve opening on a scale plate.

  Moreover, this invention provides the manufacturing method of the flow volume reading apparatus of Claim 3 which measured the flow volume in several valve opening degree by the differential pressure | voltage of the pressure gauge provided before and behind the said valve main body. is there.

  According to the flow rate reading device according to the present invention, the valve body is provided with a pointer that moves in conjunction with the amount of movement of the valve stem, and a valve opening indication scale that reads the opening of the valve body from the position of the pointer, The valve body can be installed without comparing the valve opening and the flow characteristic curve by having a flow scale corresponding to the valve opening based on the flow characteristic of the valve element on the valve opening indicating scale. Since the fluid flow rate can be grasped at the site, the valve opening degree can be adjusted while checking the flow rate at the site. Further, by providing both the valve opening scale and the flow scale, there is an effect that the flow characteristics of the valve body and the shape of the valve can be grasped.

  Moreover, this invention measured the flow volume in the several valve opening degree of the said valve body with a flowmeter, and calculated | required the flow volume characteristic of the said valve body from the relationship between the measured flow volume and valve opening degree. Therefore, it is possible to obtain the flow rate characteristic of the valve body that matches the actual use state, and to accurately grasp the flow rate of the fluid.

  Further, according to the manufacturing method of the flow rate reading device according to the present invention, the pointer that moves in conjunction with the amount of movement of the valve stem of the valve body, and the valve opening indication scale that reads the opening of the valve body from the position of this pointer In the valve body provided with a panel, means for measuring the flow rate at a plurality of valve openings of the valve body with a flow meter, means for determining the flow characteristics of the valve body from the relationship between the measured flow rate and the valve opening, Based on the flow rate characteristic, the valve opening degree indicating scale plate has a means for marking the flow rate scale corresponding to the valve opening degree, thereby obtaining the flow rate characteristic of the valve body in accordance with the actual use state. From this flow rate characteristic, a simple and highly accurate flow rate reading device can be obtained. Therefore, since the flow rate of the fluid can be grasped at the site where the valve body is installed without comparing the valve aperture and the flow rate characteristic curve, there is an effect that the valve aperture can be adjusted while checking the flow rate at the site. .

  Moreover, this invention is equipped with the flowmeter by having the structure of Claim 3 which measured the flow volume in several valve opening by the differential pressure | voltage of the pressure gauge provided before and behind the said valve main body. Even if there is no pipe line, the flow rate of the fluid can be measured from the differential pressure before and after the valve body.

Embodiments of the present invention will be described based on examples shown in the drawings.
The flow rate reading device according to the present invention includes a pointer 15 that moves in conjunction with the amount of movement of the valve stem 11 in the valve body 10, and a valve opening indication scale 1 that reads the opening of the valve body 12 from the position of the pointer 15. The flow rate scale 3 corresponding to the valve opening is provided on the valve opening indication scale 1 based on the flow characteristics of the valve body 12.

  In the illustrated embodiment, FIG. 1 shows a diaphragm type control valve. The valve body 10 includes a valve seat 13 that partitions the upstream side and the downstream side of the pipe line 20, a valve body 12, and a valve rod 11. A valve port 14 is formed in the valve seat 13 so that the valve port 14 can be opened and closed by withdrawing the valve body 12 in a direction perpendicular to the axis of the pipe line 20. A valve rod 11 that opens and closes the valve body 12 is connected to the valve body 12, and the opening degree of the valve rod 11 can be adjusted by a diaphragm 16 so that the valve opening degree can be adjusted.

  In the embodiment shown in FIG. 1, the valve stem 11 is provided with a pointer 15 that moves in conjunction with the amount of movement of the valve stem 11, and the valve body 10 has an opening degree of the valve body 12 from the position of the pointer 15. Is provided. The pointer 15 is provided with a moving member that moves together with the valve stem 11 on the valve stem 11, and rotates around the fulcrum pin as the moving member moves to increase the amount of movement of the valve stem 11. It is preferable to be configured so that instructions can be given.

  2 and 3 show the valve opening instruction scale plate 1 in an enlarged manner. The valve opening instruction scale plate 1 includes a valve opening scale 2 and a flow rate scale 3 so that the fluid flow rate can be read from the position of the pointer 15. The flow rate scale 3 is stamped corresponding to the valve opening scale based on the flow rate characteristic curve of the valve body 12 shown in FIG. As shown in FIG. 4, the flow characteristics of the valve body are, as shown in FIG. 4, linear characteristics (straight line a in the figure), equal percentage characteristics (curve b in the figure), and quick open characteristics (figure 4). It is classified into the middle curve c). Generally, a control valve having a linear characteristic, an equal percent characteristic, or an intermediate characteristic is used for flow rate control.

  FIG. 2 shows a valve opening instruction scale 1 including a flow characteristic scale 3 of a linear characteristic valve body, and FIG. 3 shows a valve opening instruction scale 1 including a flow quantity scale 3 of an equal percentage characteristic valve body. Is shown. The flow rate scale 3 can be engraved on the valve opening indication scale plate 1 based on the flow rate characteristic curve of the valve body 12 which is measured in advance and described in the valve specification or the like. In addition, since the flow rate scale 3 can improve the accuracy of the scale, the flow rate at a plurality of valve openings of the valve body 12 is measured with a flow meter in a state where the valve body 10 is installed in the pipe line 20 and measured. It is preferable that the flow rate characteristic of the valve body 12 is obtained from the relationship between the flow rate and the valve opening degree, and the valve opening indication scale plate 1 is marked based on the flow rate characteristic.

  FIG. 5 is a block diagram showing an embodiment of the flow rate measuring device. A pressure gauge 4 is provided on the upstream and downstream pipe lines 20 of the valve body 10. Reference numeral 5 denotes a flow rate measuring device which can measure the flow rate of the fluid by the differential pressure before and after the valve body 10 measured by the pressure gauges 4 and 4. Further, the flow rate measuring device 5 is configured to measure the flow rate at a plurality of valve openings to obtain the flow rate characteristic of the valve body 12.

  The flow rate reading device according to the present invention is not limited to a configuration in which the valve body 10 adjusts the valve opening degree by moving the valve body 11 in and out of the valve body 11 as shown in the illustrated embodiment. Therefore, it can also be used in a configuration that adjusts the valve opening.

The front view which shows one Example of the flow volume reading apparatus which concerns on this invention. The front view which shows the principal part of the Example. The front view which shows the principal part of another Example. The figure which shows the flow volume characteristic of a valve body. The block diagram which shows one Example of a flow measuring device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve opening indication scale board 2 Valve opening scale 3 Flow volume scale 4 Pressure gauge 5 Flow rate measuring device 10 Valve main body 11 Valve rod 12 Valve body 13 Valve seat 14 Valve port 15 Pointer 16 Diaphragm 20 Pipe line

Claims (4)

  The valve body is provided with a pointer that moves in conjunction with the amount of movement of the valve stem, and a valve opening indication scale that reads the opening of the valve body from the position of the pointer, and the valve opening indication scale plate A flow rate reading device provided with a flow rate scale corresponding to the valve opening based on the flow rate characteristics.   The flow rate reading device according to claim 1, wherein the flow rate at a plurality of valve openings of the valve body is measured with a flow meter, and the flow rate characteristic of the valve body is obtained from the relationship between the measured flow rate and the valve opening degree.   In a valve body provided with a pointer that moves in conjunction with the amount of movement of the valve stem of the valve body and a valve opening instruction scale plate that reads the opening degree of the valve body from the position of the pointer, Means for measuring the flow rate at the valve opening, means for determining the flow characteristic of the valve body from the relationship between the measured flow rate and the valve opening, and the valve opening on the valve opening indicating dial based on the flow characteristic A method for manufacturing a flow rate reading device comprising means for marking a flow rate scale corresponding to.   The method for manufacturing a flow rate reading device according to claim 3, wherein flow rates at a plurality of valve openings are measured by differential pressures of pressure gauges provided before and after the valve body.

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