JPS6124586B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control valve device in which a plate-shaped ring-shaped seat member is elastically deformed into a flat ring shape and attached to a valve body, and a preload force accompanying the deformation is used to control the downstream side when the valve is closed. An object of the present invention is to provide a control valve device that suppresses pressure increase.

The control valve device 1 shown in FIG. 1 has a so-called self-powered pressure control operation in which a part of the passing fluid is introduced into a diaphragm-type valve body drive part 2, and the valve opening degree of the valve part 3 is varied by the fluid. Do the following. Since the valve part 3 is of a reverse action type, for example, when the pressure on the downstream side becomes large and the driving pressure in the valve body driving part 2 increases, the valve shaft 4 is displaced upward, and the valve body 5 is moved against the valve seat 6. The flow path is closed off when it is seated. The part of the valve body 5 that abuts the valve seat 6 has a second
As shown in the figure, a sheet member 7 is provided.

This conventional sheet member 7 is made of a ring-shaped rubber or the like having a rectangular cross section as shown in FIG. ing.
When the valve body 5 is seated on the valve seat 6 at the time of shutoff, the protrusion 6a of the valve seat 6 contacts the seat member 7, and the seat member 7 applies a predetermined surface pressure to the protrusion 6a, thereby closing the flow path. is closed. The sheet surface pressure required for this closure varies depending on the material of the sheet member 7,
For example, a larger sheet surface pressure is required in the order of rubber material, resin material, and metal material, and in the case of sheet members made of the same material, the smaller the elastic force of the sheet member 7 itself, the greater the sheet surface pressure. is required.

However, in the conventional sheet member 7, since the sheet member 7 having the same shape as the groove portion 5a is simply fitted and fixed in the groove portion 5a, the elastic force of the sheet member 7 itself is small, and therefore the flow path is closed off. required a large sheet pressure. This causes a significant inconvenience, especially when the self-powered control valve device 1 shown in FIG. 1 is applied as a pressure control valve device for low-pressure gas, such as in city gas supply equipment, for example.

In the case of this type of self-powered pressure control valve device, the driving pressure within the valve body drive unit 2, that is, the pressure on the downstream side when the downstream gas demand stops and the valve unit 3 is fully closed, is called the cut-off pressure. . However, the conventional sheet member 7
In the case of the control valve device 1 using a valve, a large seat pressure is required as described above, so as shown by the solid line in FIG. A drive pressure that is approximately twice as large is required.

In this case, the valve device 1 supplies low-pressure gas to a general household, etc., and for the safety of end gas consumers, it is necessary to set certain limits on the upper and lower limits of the gas pressure. Therefore, the set pressure on the downstream side of the valve portion 3 must be lowered by using this cut-off pressure as the upper limit value of the gas pressure. For this reason, in the case of a conventional valve device with a high shutoff pressure, the range in which gas can be supplied is significantly limited when considering the loss in the pipeline up to the end consumer. In order to eliminate this inconvenience, conventional methods have used methods such as using a valve body drive unit with a large capacity or reducing the port diameter of the valve to suppress the amount of pressure increase at the time of shutoff, but the structure is complicated and It has drawbacks such as not being able to be constructed at low cost.

The present invention eliminates the above drawbacks, and the fifth
An embodiment thereof will be explained with reference to FIGS. 8 to 8.
5 and 6 respectively show a cross-sectional view of a seat member of an embodiment of the invention control valve device, and a partially enlarged cross-sectional view showing changes in shape before and after installation.

In this embodiment, the sheet member 8 is made of a rubber material such as nitrile rubber. In its natural state before being fitted into the groove 5a, the sheet member 8 has a dish-shaped ring shape with the inner peripheral edge slightly protruding from the outer peripheral edge, as shown in FIG. The maximum diameter Dimax on the inner peripheral edge side of this sheet member 8 is approximately equal to the inner peripheral diameter Di' of the groove portion 5a, and the minimum diameter Dimin is the inner peripheral diameter
smaller than Di′. Further, the maximum diameter Domax on the outer peripheral edge side of the sheet member 8 is approximately equal to the outer peripheral diameter Do' of the groove portion 5a, and smaller than the minimum diameter Domin outer peripheral diameter Do'.

For this reason, the seat member 8 is attached to the valve body 5 shown in FIG.
When fitting the sheet member 8 into the groove 5a, an adhesive is applied to the lower surface of the sheet member 8 so that the inner peripheral edge side does not float up.
The lower surface of the groove 5a is completely aligned with the bottom of the groove 5a and fixed.

The sheet member 8 fixed in the groove 5a is elastically deformed until its upper surface becomes flat, and forms a flat ring shape like the conventional sheet member 7. At this time, the sheet member 8 is inserted into the groove portion 5 as shown by the dotted line in FIG.
It is compressed and deformed to match the shape of a, and a preload force commensurate with the deformation is applied.

The seat member 8, which is formed by elastically deforming a dish-shaped ring shape into a flat ring shape, has a lower preload force regardless of the closing pressure as shown in the diagram, compared to the conventional seat member 7 shown in the diagram in FIG. Maintain a charged state.

When the dish-shaped ring-shaped seat member 8 is used in this way, the preload force of the seat member 8 itself is larger than when the seat member 7 having the same shape as the groove 5a is used, so the dotted line in FIG. As shown, sufficient seat surface pressure can be obtained even with a small shutoff pressure, and sufficient valve shutoff can be achieved. Therefore, the sheet member 8
When the control valve device provided with this is applied as a low-pressure gas control valve device, it is possible to meet the gas demands of a wide range of consumers without lowering the gas supply pressure (set pressure) on the secondary side.

In the above embodiment, the sheet member 8 is fixed to the valve body 5 with an adhesive. For example, after the sheet member 9 is fitted into the groove 5a as shown in FIG. It is also possible to have a structure in which a ring-shaped presser member 10 is applied and the sheet member 9 is fixed by this presser member 10.

Further, in each of the above embodiments, the control valve device is not limited to a gas pressure control valve, but may be applied to other control valve devices.

Further, the sheet members 8 and 9 are not limited to rubber materials, but may be made of any material that can provide a preload force when elastically deformed, and may be made of, for example, a resin material.

Further, the valve portion 3 of the control valve device 1 is not limited to a reverse-acting type, but may be a direct-acting type in which the valve opening degree increases when the valve shaft is displaced upward. Further, the valve body 5 is not limited to a disk shape, but other shapes may also be used.

As described above, the control valve device of the present invention includes a flat plate ring, and a seat member having a free shape in the shape of a dish ring is placed on a portion of the valve body that is in contact with the valve seat, which is seated and separated from the valve seat and closes off the flow path when seated. Compared to conventional control valve devices, which have a structure in which a sheet member with a flat ring shape is fixed to the valve body as it is, the free shape is elastically deformed into a flat ring shape. By elastically deforming the seat member into a flat ring shape, the preload force can be increased, and even with a small shutoff pressure, sufficient seat surface pressure can be obtained, reducing the force required to close the flow path on the valve body. As a result, the valve body driving force required for the valve body drive unit is also small, and therefore, for example, when applied to a self-powered pressure control valve device, the shutoff pressure at the time of shutoff can be reduced. , there is no need to lower the set pressure on the secondary side, and as a result, the range of fluid supply on the downstream side of the control valve device can be expanded.

[Brief explanation of the drawing]

1 and 2 are a longitudinal cross-sectional view of an example of a control valve device and an enlarged vertical cross-sectional view of the valve portion thereof, FIG. 3 is a cross-sectional view of an example of a seat member of a conventional control valve device, and FIG. 4 is a control valve device. Flow rate-pressure characteristic diagram of the device, Figures 5 and 6 are a sectional view of an embodiment of the seat member used in the invention control valve device, and a partially enlarged sectional view showing changes in shape before and after installation, Figure 7 The figure is a vertical sectional view of a modified side of the valve portion of the control valve device of the present invention, and FIG. 8 is a diagram for explaining the preload force of the seat member of the control valve device of the present invention. 1... Control valve device, 5... Valve body, 6... Valve seat, 8, 9
...Sheet parts.

Claims (1)

[Claims] 1 A seat member having a free shape in the shape of a dish ring is elastically deformed into a flat ring shape and fixed to the valve seat contacting portion of the valve body which is seated and separated from the valve seat and closes off the flow path when seated. Control valve device.