JPS6223185B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve device, which is small and lightweight and can be easily attached to piping by connecting a constant flow valve and a spherical valve by almost directly assembling the casings to each other. The purpose is to provide a valve device.

Generally, a self-powered constant flow valve and a spherical valve are sometimes provided in the same piping so that flow rate control and opening/closing of a flow path can be performed simultaneously. However, in conventional valve devices consisting of a combination of a constant flow valve and a spherical valve, the constant flow valve and the spherical valve are separate assemblies, resulting in increased piping length and weight, and also requires a large amount of piping man-hours. Due to its large size, it had disadvantages such as high material and construction costs.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings. The figure shows a longitudinal sectional view of one embodiment of the valve device of the present invention.

In the figure, a valve device 1 is constructed by integrally assembling a downstream spherical valve 2 and an upstream constant flow valve 3.
The downstream spherical valve 2 has a spherical valve body 5 rotatably placed in a casing half 4 which has a flange 4a for assembling a constant flow valve screwed to one end and a flange 4a for piping connection at the other end. It is configured by incorporating it into.
A through hole 5a is formed in the center of the spherical valve body 5, and when the valve shaft 6 is rotated from the outside,
The flow path can be opened and closed by changing the direction of the through hole 5a. 7 is a seat ring that seals between the spherical valve body 5 and the inner wall of the casing half body 4.

The upstream constant flow valve 3 has a cylindrical casing half 8, which has a flange 8b on one end to which a connecting pipe 32 is fixed for assembling the spherical valve 2, and a flange 8a for piping connection on the other end. A constant flow valve body 9 is held within the flow path so as to be displaceable in the direction of the flow path. The constant flow valve body 9 is assembled with the valve shaft 12a held in a holding portion 11 formed in an adapter 33 fitted into the inner periphery of the connecting pipe 32. The holding portion 11 is supported on the inner peripheral portion of the adapter 33 using, for example, three pillars. The valve stem 12a is provided protrudingly from a spring seat 12, and another spring seat 1 fitted into this spring seat 12 is provided.
A coil spring 14 is compressed and fitted between 3 and 3.
The spring seat 13 is urged upstream by a spring 14 and is locked in the cylindrical valve body 9a so as to be movable in the axial direction together with the valve body 9a. An orifice portion 15 is formed between the downstream end of the valve body 9a and the opening of the outlet 10. 13a is a pressure receiving plate protruding from the spring seat 13. In the case of this embodiment, a space (buffer chamber) 16 is formed at the fitting portion of the spring seats 12 and 13, and this space 16 is filled with gas such as air, so that the spring When the seat 13 is displaced, it acts as a damper to suppress the displacement speed.

Here, a seat ring 17 is attached to a ring-shaped protrusion 33a formed on the inner circumference of the adapter 33, and a connecting pipe 32 between the flange 4a and the flange 8a is attached.
When further fixed, this seat ring 17 presses against the circumferential surface of the spherical valve body 5 with an appropriate force, and the spherical valve body 5 is firmly held by the seat rings 7 and 17 on both sides. . Since the above-mentioned appropriate pressing force exists, even if the seat ring 17 wears out with use, the seal between the spherical valve body 5 and the seat ring 17 is perfect. Also, at this time, both ends of the adapter 33 are locked between the flange 8b and a stopper ring 34 attached to the inner periphery of the flange 4b.

In this way, the valve device 1 having the above configuration does not require any piping because the connection pipe 32 and the adapter 33 as connecting members are simply interposed at the connecting portion between the spherical valve 2 and the constant flow valve 3, and The casing halves 8, 4 of the valve 3 and the spherical valve 2 are connected to flanges 8b,
4a, the entire device can be made smaller and lighter, and since it is only necessary to connect the flanges 8a and 4b at both ends to the piping, installation is easy. It's extremely simple.

Next, the operation of the valve device 1 having the above structure will be explained. If the fluid flow is a steady flow, the flow path area of the orifice portion 15 of the constant flow valve 3 is kept approximately constant, and the spherical valve 2 has a through hole 5a of the spherical valve body 5 that is open approximately parallel to the flow path. It is in a valve state. Therefore, the fluid that has flowed into the casing half 8
The water passes between the inner wall of the valve body 9a and the outer periphery of the valve body 9a, is further throttled by the orifice portion 15, flows into the spherical valve 2 through the outlet 10, and flows out to the piping side through the through hole 5a.

Suppose now that the fluid flow rate has become larger than the steady value. In this case, the pressure that the pressure receiving plate 13a receives from the fluid becomes large, and the constant flow valve body 9 is displaced downstream, and as a result, the valve body 9 is displaced together with the spring seat 13.
The flow path area of the orifice portion 15 is reduced by a. This increases the amount of restriction of the orifice portion 15, and the flow rate of the fluid flowing inside the casing half 8 is automatically kept constant.

On the contrary, when the fluid flow rate becomes smaller than the steady state value, the valve body 9 is displaced upstream by the pressing force of the spring 14, and the flow path area of the orifice part 15 increases, and the flow rate becomes smaller than the steady state value. Increases recovery up to the value.

In addition, if the flow rate increases significantly in a stepwise manner due to a change in the pipe conditions on the upstream side, the pressure receiving plate 13
The displacement of a is damped by the biasing force of the spring 14 and the compression resistance of the gas in the space 16, thereby avoiding the inconvenience that the end of the valve body 9a collides with the opening of the outlet 10. I can do it.

Note that a spring seat 13 is provided inside the valve body 9a on the upstream side.
is provided, and a spring seat 12 is provided on the downstream side, so that almost no fluid passes through the inside of the valve body 9a. Therefore, the spring 14 within the valve body 9a is always housed in a stable state without being affected by the fluid. Therefore, the pressure receiving plate 1 energized by the spring 14
3a does not wobble, and the valve body 9a is stably displaced to control the flow rate at a constant level.

Here, in order to close the spherical valve 2, the valve shaft 6 may be rotated approximately 90 degrees from the state shown in the figure, and the through hole 5a of the spherical valve body 5 may be made approximately perpendicular to the flow path.

In the case of this embodiment, since the constant flow valve 3 is located on the upstream side, when the spherical valve 2 is throttled, for example, the constant flow valve 3
The valve body 9a does not vibrate abnormally inside the spherical valve 2, and thus has a good flow control effect regardless of the opening degree of the spherical valve 2.

As described above, in the valve device of the present invention, a casing is constructed by assembling a pair of casing halves that can be connected and separated, and a constant flow valve is installed in the other casing half upstream of one casing half. Since the spherical valve is installed inside one casing half, only a connecting member is required at the connection part between the constant flow valve and the spherical valve, and no piping is required at all.This makes the entire device smaller and lighter. In addition, since the installation on the piping is extremely simple, both material and construction costs can be reduced considerably.Also, since the constant flow valve is located on the upstream side, it is independent of the valve opening of the spherical valve. A constant flow valve body can perform good flow control without abnormal vibration, and the casing half on the spherical valve side is configured so that the valve body can be accommodated through its opening, so it is suitable for spherical valves with a split casing structure. Particularly suitable. Further, since the spring is provided inside the valve body, the spring can be housed stably without being affected by the fluid, and the flow rate can be controlled stably. In addition, since the buffer chamber is provided within the valve body, dust in the fluid does not enter the buffer chamber, and therefore, sudden displacement of the pressure receiving plate can be reliably suppressed by the action of the buffer chamber. It has features such as being able to prevent the valve body from abutting against the inner wall of the flow path.

[Brief explanation of the drawing]

The figure is a longitudinal sectional view of one embodiment of the valve device of the present invention. DESCRIPTION OF SYMBOLS 1... Valve device, 2... Spherical valve, 3... Constant flow valve, 4... Casing half, 5... Spherical valve body, 8
...Casing half body, 9...Constant flow valve body.

Claims (1)

[Claims] 1. A pair of casing halves that are open at both ends and are coupled with one end opening aligned with each other, and a casing half disposed displaceably within the other casing half located upstream from the one casing half. , a valve body that controls the flow rate at a constant level by displacing its outer periphery so as to vary the flow path area; a pressure receiving plate that is provided on the upstream side of the valve body and receives fluid pressure and is displaced together with the valve body; a spring housed inside the valve body and urging the pressure receiving plate to the upstream side; a buffer chamber provided inside the valve body suppressing the displacement speed of the pressure receiving plate; and the one end inside the one casing half. A valve device comprising a spherical valve body that is housed through a side opening and is displaced by external operation to open and close a flow path.