JPH0313014Y2 - - Google Patents

Description

[Detailed description of the invention] [Effects of the invention] (Field of industrial application) The present invention relates to a self-cleaning valve device.

(Prior art) For example, each valve used for sanitary piping, whether manual or automatic, has an elastic body such as rubber attached to the valve body side, and the seat of the valve body that this elastic body tightly seals is made of metal. The valve is closed when the two are in close contact with each other.

Conventionally, the structure of the sealing portion of the valve body is such that the elastic body B is fixed to the lower part of the valve body A from above and below, as shown in Figure 8, or as shown in Figure 9. An annular groove C is formed in the lower part of the valve body A, and a ring-shaped elastic body D is press-fitted into the groove C to be fixed.

(Problem to be solved by the invention) However, when a valve with the above-mentioned conventional structure is used in sanitary piping, the fluid flowing through the piping may be highly permeable, or the fluid may leak due to stress generated by opening and closing the valve. It penetrates into the interior of the elastic body, causing corrosion (cross contamination).

Therefore, when cleaning this type of valve, it is necessary to clean the valve at the same time as cleaning the piping.
The above-mentioned valve structure has a problem in that the inside of the pipe cannot be completely cleaned with the cleaning liquid.

On the other hand, in order to avoid the above-mentioned problems, some valve bodies themselves are made of polyfluoroethylene resin, but according to this, in practice, when there is a temperature change when the valve is open, easily influenced. In other words, when the temperature rises in the closed state,
There is a problem in that the valve body itself expands thermally, causes plastic deformation because it is restricted by a metal part, and also contracts when the temperature drops, creating a gap in the sealing part, which is likely to cause leakage.

The present invention was developed with the aim of improving the above-mentioned problems of the prior art.It is possible to completely clean the valve seal part when cleaning pipes, and to prevent liquid seepage. The purpose of the present invention is to provide a self-cleaning valve device.

[Structure of the idea]

(Means for Solving the Problems) In order to achieve the above object, the valve device according to the present invention connects one fluid passage of the valve body to one side of the valve body by means of a valve body that slides in a sealed manner along a sliding portion within the valve body. In a valve device that opens and closes an opening in the valve body of the other communicating fluid passage, an O-ring-shaped sealing material that can come into close contact with the inner edge of the opening in the valve body of this fluid passage is attached to the outer periphery of the sealing material holding part of the valve body. The seal member is fitted loosely in the axial direction of the valve body, and the seal member is configured to float away from the inner edge of the opening in the valve body of the fluid passage when the valve is opened.

(Function) With the above configuration, when the valve body is opened and cleaning liquid is pressurized from the fluid passage on the inflow side, the O-ring-shaped seal material floats around the outer circumference of the valve body, and the inner circumference of the seal material and The cleaning liquid flows through the sealing material holding portion, thereby completely cleaning the seal and the sealing material holding portion.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 7.

FIG. 1 shows a cross-section of half of an embodiment of the present invention when the valve is closed when it is applied to a manual opening/closing valve connected as a gas vent valve in sanitary piping. A rod-shaped valve body 3 is inserted into the sliding portion 2 through an O-ring 4 so as to be able to slide tightly therethrough, and one side of the valve body 1 is connected to a fluid passage 5 which is an inflow side and opens at the bottom of the valve body 1. A communicating fluid passage 6 on the outflow side is formed,
The valve body opening 6A of the fluid passage 6 is opened and closed by the valve body 3.

In the figure, the upper part of the valve body 3 protrudes from the valve body 1, the hole 7A of the handle 7 is fitted into this protrusion, and the valve body 3 is secured and attached by a set screw 8 screwed onto the upper end of the valve body 3. ing. The lower cylindrical portion 7B of the handle 7 is fitted onto the outer periphery of the upper end of the valve body 1, and the handle 7 is fitted into the male thread of the valve body 1.
A female thread on the inner circumference of the cylindrical part is screwed together, and by rotating this handle 7 and loosening the screw, the valve body 3 is pulled upward in the figure (valve opening direction).
It is now possible to move the A compression spring 9 is interposed between the stepped portion 3A of the valve body 3 and the lower surface of the handle 7, and presses the valve body 3 downward to maintain sealing performance. In this embodiment, a gap of about 1 mm is provided between the lower surface of the set screw 8 at the upper end of the valve body 3 and the upper surface of the handle 7, and after the handle 7 is tightened to close the valve, the compression spring 9 When the valve body 3 is pressed downward and the handle 7 is loosened when the valve is opened, the upper surface of the handle 7 hits the lower surface of the set screw 8, and from then on the handle 7 moves upward together with the valve body 3. 1
Compared to the conventional valve shown in Figure 0, which opens and closes while bending the compression spring E that pressurizes the valve body A, the handle operation when opening the valve can be made much easier.

A sealing material holding portion 10 is formed near the lower end of the valve body 3, and an O-ring shaped sealing material 11 is freely held in this sealing material holding portion 10.

The sealing material holding part 10 in this embodiment is constituted by a flange 10A formed on the outer periphery of the valve body 3, as shown in FIG. 3 as a partially enlarged view. An O-ring-shaped sealing material 11 is loosely fitted around the outer periphery of the lower valve body 3.

The O-ring-shaped sealing material 11 has a flange 10A on the lower inner edge 12 of the opening 6A of the fluid passage 6 on the outflow side.
By being pressed and brought into close contact with each other, the opening 6A of the fluid passage 6 is cut off from the fluid passage 5 on the inflow side, and the valve is closed.

For the O-ring-shaped sealing material 11, a polyfluoroethylene resin (trade name: Teflon) or a metal O-ring is used. These materials are preferable because they have excellent non-stick properties and satisfy the need for having a certain degree of rigidity against fluid flow.

On the lower end circumferential surface of the valve body 3, as shown in FIG.
As shown in the line enlarged cross section, a plurality of grooves 13,1
3... are formed in the axial direction, and when the valve body 3 is pulled up, the fluid passage 5 and the fluid passage 6 are communicated through these grooves 13, 13..., and if it is a gas vent valve, the gas flows through the above path. It becomes discharged or collected through.

Next, the operation of the above embodiment will be explained.

When the valve is in the closed state shown in FIG. The valve body 3 is attached to the lower inner edge 12 of the portion 6A.
The fluid passages 5 and 6 are kept in close contact with each other by the pressing action of the flange 10A, whereby the fluid passages 5 and 6 are blocked off by the sealing material 11.

When the valve is opened, when the handle 7 is rotated and the valve body 3 is pulled up, the lower flange 10A rises, thereby releasing the pressure on the O-ring sealing material 11.
The fluid from the fluid passage 5 flows through the groove 1 around the lower end of the valve body 3.
3, 13... into the fluid passage 6, and is discharged or collected.

When cleaning the valve, when cleaning fluid is pressurized from the fluid passage 5 side (piping side) while maintaining the valve open state, the cleaning fluid flows through the O-ring sealing material 11.
between the sealing material 11 and the periphery of the valve body 3, and the sealing material 11 and the flange 1.
The sealing material 11 flows entirely along the outer circumferential surface of the sealing material 11 between the lower surface of the valve body 0A and is discharged into the fluid passage 6, and not only the sealing material holding portion 10 of the valve body 3 but also the sealing material 11 itself is completely automatically cleaned.

FIG. 5 shows a front view of a half-section when the valve is closed when the present invention is applied to an automatic opening/closing valve that opens and closes using pressurized air. The piston 14 is tightly slidably inserted into the upper cylinder portion 16 of the valve body 1 via a seal ring 17, and the valve body 3 is normally held in the closing direction by a compression spring 18. is pressurized.

A pressure air supply port 19 is provided at the bottom of the cylinder portion 16, and an exhaust port 20 is provided at the top thereof, and the pressure air supply port 19 is connected to a pressure air supply source 21 as shown in FIG. A switching valve 23 for controlling the supply and discharge of pressurized air is interposed in the middle of the pipe 22, so that the valve body 3 can be opened and closed by the pressurized air.

If an automatic opening/closing valve is used as in the above embodiment, the sanitary piping 24 as illustrated in FIG.
The fluid passage 5 is connected to a gas venting container 25 connected to the sanitary pipe 24, and when the amount of gas in the liquid flowing in the sanitary piping 24 increases, the gas is introduced into the gas venting container 25, and the liquid level in this container 25 increases. is lowered by gas pressure, the liquid level detector 26 (e.g. float 2
A drop in the liquid level is detected by a proximity switch that detects 7 or a level gauge, etc., and pressure air is introduced to the lower surface of the piston 14 by switching the switching valve 23 based on the detection signal, and It is suitable for use as an automatic gas vent valve that opens and automatically releases gas by pulling up the valve body 3. Note that the same parts as in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

In the case of this embodiment as well, if the valve body 3 is maintained in the open state during cleaning and the cleaning fluid is force-fed to the sanitary piping 24, the cleaning fluid is shaped like an O-ring as in the case of the manual opening/closing valve described above. Seal material 11
Also, the sealing material holding section 10 can be automatically cleaned.

Furthermore, FIG. 7 shows a front half-sectional view of an example in which the present invention is applied to a switching valve.
The valve body 1 has a fluid passage 5 (corresponding to the fluid passage 5 in each of the above embodiments) and a fluid passage 2 on the outflow side.
The flange 10A of the valve body 3 is located at the valve body opening 5A of the fluid passage 5. O-ring-shaped sealing material 1 is placed on the outer periphery of the valve body 3 at the upper and lower parts of the flange 10A.
1 and 11' are loosely fitted. When the valve body 3 rises, the upper inner edge 1 of the opening 5A of the fluid passage 5
2' to block the flow in the direction of the fluid passage 6', and when the valve body 3 is lowered, the O-ring-shaped sealing material 11 on the lower side comes in close contact with the lower inner edge 12 of the opening 5A of the fluid passage 5. It is designed to block the flow in the direction of the fluid passage 6. Note that the same parts as in FIG. 5 are designated by the same reference numerals, and their explanation will be omitted.

In this embodiment as well, if the cleaning fluid is fed under pressure from the fluid passage 5 while switching the valve body 3 upward or downward, the O-ring-shaped sealing materials 11, 11' and the sealing material holding portion 10,1
0' automatic cleaning can be performed.

[Effect of idea]

As explained above, in the self-cleaning valve device according to the present invention, the valve body of one fluid passage of the valve body communicates with the other fluid passage by the valve body which is slid in a sealed manner along the sliding part in the valve body. In a valve device that opens and closes an inner opening, an O-ring-shaped sealing material that can tightly adhere to the inner edge of the opening in the valve body of this fluid passage is loosely fitted to the outer periphery of the sealing material holding part of the valve element in the axial direction of the valve element. The configuration is as follows.
When the valve is opened, the sealing material is made to float away from the inner edge of the opening in the valve body of the fluid passage, so that cleaning fluid is forcedly fed from the fluid passage on the fluid inflow side, thereby reducing the gap between the O-ring-shaped sealing material and the valve body. , flows between the sealing material and the sealing material holding bracket, and around the outer periphery of the sealing material, thereby automatically cleaning the sealing portion, which is extremely effective in maintaining sealing performance.

[Brief explanation of the drawing]

Fig. 1 is a front view of one embodiment of the invention applied to a manual opening/closing valve, with half of the valve in the closed state taken in cross section, Fig. 2 is a plan view of the same half, and Fig. 3 is the first embodiment of the invention.
Figure 4 is a partially enlarged view of the lower part of the valve body in the figure.
Figure - line enlarged sectional view of the part corresponding to the line, No. 5
The figure is a front view of one embodiment of the present invention applied to an automatic opening/closing valve using pressurized air, with half of the valve in the closed state cut away, and FIG. 6 is an explanation showing an example of the use of the valve of FIG. 5. FIG. 7 is a front view with a half section cut away showing the case where the present invention is applied to a flow path switching valve, and FIGS. 8 to 10 are explanatory diagrams of the prior art. 1... Valve body, 3... Valve body, 5, 6, 6'
...Fluid passage, 5A, 6A...Opening, 7...Handle, 10, 10'...Seal material holding part, 10
A... Flange, 11, 11'... O-ring sealing material, 12... Lower inner edge, 12'... Upper inner edge, 1
3... Groove, 14... Piston, 19... Pressure air supply port, 20... Exhaust port, 21... Pressure air supply source, 23... Switching valve, 24... Sanitary piping,
25...Gas venting container, 26...Liquid level detector.

Claims (1)

[Scope of utility model registration request] In a valve device that opens and closes an opening in the valve body of a fluid passage communicating with one fluid passage of the valve body by a valve body that closely slides along a sliding part in the valve body, the valve of this fluid passage. An O-ring-shaped sealing material that can be tightly attached to the inner edge of the opening in the main body is loosely fitted to the outer periphery of the sealing material holding part of the valve body in the axial direction of the valve body, and when the valve is opened, the sealing material is inside the valve body of the fluid passage. A self-cleaning valve device characterized in that it floats away from the inner edge of an opening.