JPS6357969A - Pipe flow switching device - Google Patents

Abstract

PURPOSE:To have easy replacement of valve seat by mounting a valve seat, which has a smaller dia. than a spacer insert hole provided in a top lid, at the bottom surface of a valve chest with possibility of removal. CONSTITUTION:A plurality of outlets 13 are bored in the bottom surface of a valve chest 2 on one circumference, and a removable valve seat 15 is installed at each of these outlets 13. The outside dia. D2 of each valve seat is smaller than the outside dia. D1 of a spacer insert hole bored in a tap lid 2. Treatment liquid from each processing device is introduced to an inlet hole 10 of a pipeline switching device via each flow-in pipe 11. This makes it possible to remove a valve drive mechanism 7 and a spacer 6 and take out the valve seat 15 from the spacer insert hole, and repair can be done simply without requiring removal and movement of the valve bos 2.

Description

[Detailed description of the invention] [Object of the invention] (Industrial application field) The present invention is incorporated into a waste treatment system of an atomic couplant, etc.
The present invention relates to a piping flow switching device that switches the flow path of piping.

(Prior Art) Liquids heat-treated by various plant equipment and devices are usually stored in tanks or tanks (hereinafter simply referred to as tanks).
However, when the amount of processing liquid is large, the tanks, etc. are divided into multiple units due to various size restrictions due to manufacturing, transportation, or building strength. The liquid is stored separately.

In such a plant, a piping flow switching device is provided in the middle of the piping to control the flow rate of the processing liquid distributed to tanks and the like.

For example, in a pipe flow switching device in an atomic coupler plant, the fluid processed by each processing device is once merged into the main pipe, and then flows from the main pipe into each branch pipe, and the valves installed in each branch pipe are opened and closed. By doing this, it was distributed to each tank, etc.

(Problems to be Solved by the Invention) However, as the amount of liquid processed by the processing device increases, the number of tanks, etc. also increases, and as the number increases, the number of branch pipes and valves increases. The following problems occurred.

0 Because large bends occur in the piping due to merging and branching,
Pipe resistance to the flow of the processing liquid and pressure loss of the processing liquid are large.

■Sludge tends to accumulate in the bent parts of pipes and the valves installed in each branch pipe, causing blockage of the pipe flow path.

■Since a valve is provided for each branch pipe, large installations require space, and each valve also requires space for maintenance.

■Sludge adhering to the valve body and valve seat may cause the valve to close incompletely.

Considering the above points, as shown in FIG. 7, the valve seat portion 1a,
An upper cover 5 is attached to the valve box 2 in which the valve seats 1b and 1c are formed through bolts and nuts 3 and 4, and the valve seat parts 1a to 1G are attached to the upper cover.
Attach the valve drive mechanisms 7a, 7b, 7c via spacers 6 to the positions corresponding to the respective valve shafts Ba, Bb, Bc.
Valve seat part 1a, with valve bodies 9a, 9b, 9c fixed to the lower end of
ib.

A piping flow switching device that opens and closes 1c has been invented and is in use.

According to this invention, bends caused by merging and branching of pipes are eliminated to reduce fluid pressure loss, preventing clogging of the pipe flow path due to sludge accumulation, and valves are individually installed in each branch pipe. There is no need for this, the piping space can be used effectively, and it is possible to prevent incomplete switching of the flow path due to the adhesion of rough sludge.

However, in this piping flow switching device, the eighth
As shown enlarged in the figure, the valve seat portions 1a, . . .

is installed directly on the bottom of valve N2, so scratches often occur on the valve seat in sludge systems that are frequently used.
Repairs are forced.

For this repair, first remove the valve drive mechanisms 7a to 7C, then remove the spacer 6 that seals the upper cover 5 and the valve shafts 8a to 8C, remove the valve shafts 8a to 8C, and then remove the bolts and nuts 3, 4 and finally isolate the valve box 2 from the piping, the valve seats 1a to 1C will be repaired, so it is necessary to move the valve box outside the plant system or to an equipment factory.
In particular, atomic couplants require unique decontamination work, which requires a great deal of work and effort.

[Structure of the Invention] (Means for Solving the Problems) The piping flow switching device of the present invention includes a valve box having a liquid inlet hole arranged on the side surface and a plurality of liquid outlet holes provided on the bottom surface; A top cover attached to the valve box, a plurality of valve shafts disposed through the top cover, a valve drive mechanism that drives these valve shafts up and down, and a valve body provided at the bottom of the valve shaft. The liquid outflow hole is removably attached to the bottom surface of the valve box, and is formed in a valve seat having a diameter smaller than that of a spacer insertion hole transparently provided in the upper cover.

(Function) As mentioned above, in the piping flow switching device of the present invention, the valve seat is removably attached to the valve box, so if the valve seat is damaged, the piping flow switching device can be moved. It is possible to easily replace only the valve seat without having to remove the valve seat, which greatly reduces work time and costs.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings. In addition,
In these figures, the same parts as in FIG. 7 are given the same reference numerals. Furthermore, if there are a plurality of valve drive mechanisms or the like having the same structure, only one of them is numbered.

FIG. 1 is a partial vertical cross-sectional view showing an outline of the piping flow switching device of the present invention, and FIG. 2 is a cross-sectional view taken along the line I--I.

In these figures, the piping flow switching device includes a valve box 2, an upper M5 that is removably attached using bolts and nuts 3 and 4 so as to seal the upper end of the valve box, and a pipe that passes through the upper cover. The valve drive mechanism 7 is comprised of a plurality (six in this example) of valve drive mechanisms 7 arranged as shown in FIG.

As shown in FIG. 2, four processing liquid inlets 10 are bored in the side surface of the valve box 2, and these inlets have inflow pipes 11 connected to a processing device (not shown). A cleaning nozzle 12 is opened in the valve box.

There are multiple (six in this example) outlet ports 1 on the bottom of the valve box 2.
3 are drilled on the same circumference, and each outlet is connected to the outlet pipe 1.
4 to a storage tank (not shown). In addition, each outlet 13 has a removable valve seat 15.
is provided.

As shown in FIG. 1, the valve drive mechanism 7 includes a spacer 6 fitted into the upper M5, a valve stem housing pipe 17 connected to the spacer and holding the drive cylinder 16, and a drive mechanism driven by the drive cylinder 16. It consists of a shaft 8-, a valve shaft 8 held by these drive shafts, and a valve body 9 attached to the tip of each valve shaft.

Further, a packing 18 and a packing retainer 19 are inserted into the upper gap between each valve shaft 8 and the spacer 6 to form a watertight structure.

A striker 20 connected to a piston (not shown) that moves up and down inside the cylinder is provided at the top of the drive cylinder 16, and the striker 20 is configured so that the position of the valve can be confirmed by pressing the limit switch 21. has been done.

Note that the outer diameter D2 of the valve seat is smaller than the outer diameter D1 of the spacer insertion hole of the upper lid 2.

FIG. 3 shows a specific example of a valve seat, in which the valve seat 15 is of a cartridge type, inserted into a hole made in the valve box 2, and detachably attached at a seal weld 22.

FIG. 4 shows an example in which the valve seat 15 is tightened with a bolt 23 and sealed with an O-ring 24.

Fig. 5 shows an example in which the surface of the valve seat is a tapered slope that descends from the outer edge of the valve seat toward the liquid outflow hole to facilitate the outflow of liquid, and Fig. 6 shows the inner diameter of the valve seat. An example of curved into a bell mouth shape is shown below. In addition, in both Figures 5 and 6, there are grooves, holes, or claws 2 on the inner diameter of the valve seat to facilitate removal.
5 is provided.

Next, the operation of the piping flow switching device of the present invention configured as described above will be explained.

The processing liquid from each processing device passes through each inflow pipe 11 and is led to the inflow hole 10 of the piping flow switching device.

At this time, of the valve bodies 9, the valve body facing the outflow pipe communicating with the selected tank or the like is lifted by the drive cylinder 16, and the outflow port 13 is opened.

As a result, no matter which inlet 11 the processing liquid flows into the valve box 2, it is sent to a desired storage tank via the intended outlet 13.

In sludge systems that are frequently used, cleaning liquid is flowed from the cleaning nozzle 11 to remove sludge adhering to the valve body 9, but crud that has adhered to the valve body 9 etc. cannot be removed even with cleaning, and the valve seat 15, scratches etc. occur. In such a case, in the present invention, the valve seat 15 can be replaced, and the diameter D2 of the valve seat is made smaller than the outer diameter D1 of the spacer insertion hole passing through the upper cover 5, so there is no need to replace the entire device. Only the valve seat can be replaced. That is, it is possible to remove the valve drive mechanism 7 and the spacer 6 and take out the valve seat 15 from the spacer insertion hole, and the valve case 2 can be easily repaired without being removed and moved.

[Effects of the Invention] As described above, in the piping flow switching device of the present invention, when a damage occurs on the valve seat, there is no need to remove the entire valve box and perform stoppage repair work as in the past, and the defective part can be removed. All you need to do is remove the valve drive mechanism and spacer, and install a pre-prepared valve seat, making it possible to significantly reduce labor, travel costs, shorten repair time, and achieve significant VA and CD. becomes.

[Brief explanation of the drawing]

FIG. 1 is a partially vertical front view showing an embodiment of the piping flow switching device of the present invention, FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1, and FIGS. 3 to 6 are FIG. 7 is a vertical cross-sectional view showing an embodiment of the valve seat in the device of the present invention, FIG. 7 is a partial vertical front view of a conventional piping flow switching device, and FIG. 8 is a valve seat in a conventional piping flow switching device. FIG. 1a~C...Valve seat part 2...Valve box 5...Top lid 6...Spacer 7.7a, ~7G ... Valve drive structure 8.8a to 8C ... Valve shaft 8 - ... Drive shaft 9.9a to 9C ... Valve body 10 ... Processing liquid inflow Hole 11...Inflow pipe 12...Cleaning nozzle 13...Processing liquid outflow hole 14...Outflow Pipe 15... Valve seat 16... Drive cylinder 17... Valve shaft storage pipe 18... Packing 19...Packing foot 20...Striker 21...Limit switch 22...
・・・・・・Seal welding part 24・・・・・・・・・O-ring 25・・・・・・・・・Slot or mold Applicant Toshiba Corporation Agent Patent attorney Suyama Sa - Moe 1Ugl Tsuba 2 Decoy Figure 3 Figure 4 Figure N5 Figure 6 Figure 7 Figure 8

Claims (4)

[Claims] (1) A valve box having a liquid inlet hole provided on the side surface and a plurality of liquid outlet holes provided on the bottom surface, a top cover attached to the valve case, and a plurality of liquid outlet holes provided through the top cover. It consists of a valve shaft, a valve drive mechanism that drives these valve shafts up and down, and a valve body provided at the lower part of the valve shaft, and the liquid outflow hole is
1. A piping flow switching device, which is removably attached to the bottom of a valve box, and is formed in a valve seat having a diameter smaller than that of a spacer insertion hole formed through an upper cover. (2) The piping flow switching device according to claim 1, wherein the valve seat is provided with a tapered inclined surface that descends from the outer edge side toward the liquid outflow hole. (3) The piping flow switching device according to claim 1, characterized in that a groove, hole, or pawl for removing the valve seat is provided in the liquid outflow hole. (4) The piping flow switching device according to claim 1, wherein the inner diameter portion of the valve seat has a bell mouth structure.