JP2647363B2 - Branch valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a branch valve,
In particular, branching of pipelines for transporting pure water and ultrapure water used in production lines for semiconductor integrated circuits such as ICs, LSIs and VLSIs, sterile water used in the manufacture and preparation of pharmaceuticals, and liquids related to foodstuffs. The present invention relates to a novel branch valve suitable for use in a road.

[0002]

2. Description of the Related Art Conventionally, when a branch having an on-off valve is provided in a pipe line, the pipe is branched by a method shown in FIG. That is, the main pipelines 1 'and 2' are connected by a T-shaped joint 3 ', and an on-off valve such as a ball valve 5' is connected to a branch portion 31 'of the joint 3' via a connecting short pipe 4 '. A branch line 6 'is connected to 5', and a branch portion is piped. Reference numeral 7 'denotes a spherical valve body, and 8' denotes a packing for sealing between the valve body 7 'and the valve body.

[0003]

However, in the above conventional pipe, when the valve 5 'is closed, the fluid retaining portion 9' is provided between the branch portion 31 'and the valve body 7' of the valve 5 '. Occurs. As a result, the fluid retained in the retaining portion 9 'is spoiled due to the generation of bacteria and becomes unsanitary, and is used for branch piping of a pipeline for transporting liquids related to food products and aseptic water used for manufacturing and dispensing pharmaceuticals. It is not preferable as a valve to be used. In addition, the above-mentioned valve is IC, LS
I, when used in a branch pipe of a pipeline for transporting pure water / ultra pure water used in a production line of a semiconductor integrated circuit such as an ultra LSI, the pure water / ultra pure water stays in the above-mentioned stagnant portion 9 '. As a result, there is a problem that the purity of water is reduced or bacteria are generated. Furthermore, by repeatedly opening and closing the valve element 7 ', sliding friction with the valve element 7'
The surface layer of the packing 8 'becomes fine particles and flows out into pure water or ultrapure water. This is especially true for circuit widths of a few μm.
This greatly impedes the performance and yield of ultra LSI products.

[0004] As a branch valve for solving the above-mentioned disadvantages of the conventional valve, for example, in Japanese Utility Model Laid-Open Publication No. Sho 59-125666, one end of a flow path 11 'of a valve main body 10' is provided in close proximity to a spherical valve body 20 '. A ball valve type branch valve provided with a connection pipe 40 ′ having a flow path 41 ′ intersecting with and communicating with the flow path 11 ′ is described (see FIG. 6). However, in this case, no matter how close the connecting pipe 40 ′ is provided to the valve body 20 ′, it is impossible to completely eliminate the stagnation portion of the fluid. In addition, the flow path 21 'of the spherical valve element 20' completely becomes a stagnant portion when the valve is closed. In addition, there is a small gap between the outer peripheral surface of the valve body 20 'and the inner peripheral surface of the valve body. Therefore, when the valve body 20 'is closed for a long time, the fluid remaining in the flow path 21' and the gap stays as it is, and the fluid is generated by the generation of bacteria in the staying portion as in the related art. It will rot and become unsanitary,
Alternatively, in the case of pure water or ultrapure water, the problem that the purity is reduced remains unsolved. In addition, the outflow of fine particles into the fluid due to the sealing packing mounted on the inner peripheral surface of the valve body 10 'cannot be essentially prevented.

In Japanese Utility Model Application Laid-Open No. 60-110775, a three-way switching type in which a flow path 21 'of a spherical valve body 20' does not become a stagnant portion by rotating a valve body around the flow path. , A flow path 41 ″ passing through the center of the spherical valve element 4 ″, and the through flow path 41 ″
A branch flow path 42 ″ opened at a right angle to the valve body 4 ″
Of a ball valve type ultrapure water device, comprising a mechanism 5 "for rotating the valve around a through flow path 41" and a valve box 2 "surrounding the valve element 4" (see FIG. 7). ). However, in this case, the structure is complicated and expensive because the seal portion is three-sided, and the number of seal portions increases, so that leakage tends to occur, and the gap between the outer peripheral surface of the valve body and the inner peripheral surface of the valve box is increased. The gap that occurs in the fluid becomes a stagnant part of the fluid, and the problem of bacteria decay in the stagnant part and the fluid rots and becomes unsanitary, or the purity of pure water decreases, remains unsolved. is there. Also in this case, as in the case of the conventional valve, the outflow of the fine particles into the fluid due to the sealing packing cannot be essentially prevented.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a branch portion which can be directly incorporated in a pipe line.
In addition, it is an object of the present invention to provide a branch valve which does not generate a stagnation portion of a fluid in which bacteria are likely to be generated even when the valve body is opened and closed, and does not generate any outflow into the fluid.

[0007]

According to a first aspect of the present invention, there is provided a branch valve made of a synthetic resin having a branch portion incorporated in a pipe line. A weir is provided between the branch outflow port on the main flow path side and the branch inflow port on the branch flow path side, and the branch flow path side of the weir is smooth. The main body and the branch flow path are opened and closed by pressing and separating the upper surface of the weir by the diaphragm. is there.

(Function) In the branch valve according to the first aspect of the present invention, a weir is provided between a branch flow outlet on the main flow path side and a branch flow inlet on the branch flow path side of a valve body integrally formed of a synthetic resin material. Is provided, and the branch flow path side of the weir is a smooth flow path, so that the main flow path and the branch flow path can be opened and closed by pressing and separating the upper surface of the weir by the diaphragm.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. 1 is a longitudinal sectional view showing one embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II in FIG.
FIG. 3 is a plan view of the valve body.

In FIG. 1, reference numeral 1 denotes a synthetic resin valve body having a substantially straight tubular main flow path 2 and a branch flow path 3;
For example, vinyl chloride resin, polyvinylidene fluoride,
It is manufactured by injection molding from a synthetic resin material such as polybutene. The branch flow path 3 is formed integrally with the main flow path 2, and as shown in FIG. 3, the branch flow path 3 is branched in a direction substantially perpendicular to the main flow path 2.

[0011] Then, as shown in FIG.
A substantially circular opening communicating the main flow path 2 and the branch flow path 3 is provided above the opening, and each opening of the main flow path 2 and the branch flow path 3 is provided substantially at the center of the opening. A weir 4 that is divided into substantially equal parts is provided across the main flow path 2 in the axial direction. One of the openings is the branch outflow channel 2 on the main flow channel 2 side.
A, and the other is a branch inflow path 3A on the branch flow path 3 side.
It has been. The weir 4 rises from the inner side wall of the main flow path 2 and smoothly continues to the inner peripheral bottom wall of the branch flow path 3 via the upper end surface of the weir 4. As shown in FIG. 2, the upper end surface of the weir 4 is formed to be substantially concave in the axial direction of the main flow path 2. The upper end surface of the weir 4 is a valve seat 4A. The valve seat 4 </ b> A is provided near the branch between the main flow path 2 and the branch flow path 3. 4B is an opening edge of the valve body.

Reference numeral 5 denotes a valve body, which in this case is a diaphragm made of an elastic body made of synthetic resin. The diaphragm is pressed / separated from the valve seat 4A by turning the handle 6, and is branched from the main flow path 2 side. It has the effect of regulating or blocking the flow of fluid to the side. The diaphragm 5 is connected to a compressor 8 via an embedding fitting 7. Reference numeral 9 denotes a bonnet, which is fixed to the opening peripheral portion 4B of the main body 1 by bolts and nuts 10 while sandwiching the diaphragm 5. 11
Is a spindle, which is supported by a bonnet 9 via a sleeve 12. The sleeve 12 is screwed with the spindle 11. Reference numerals 13 and 13 denote TS-type receptacles, and 14 denotes a union receptacle. The arrows in the figure indicate the flow direction of the fluid in the flow path.

Next, the use state of the branch valve of the above embodiment will be described. For example, the branch valve is connected on the main flow path 2 side to a circulation path system, that is, a circulation path system such as ultrapure water processed through an impurity removing device, a sterilizing device, an ultrafiltration membrane and a reverse osmosis membrane device, On the other hand, the branch flow path 3 is used by being connected to each use point.

When the handle 6 is turned in a predetermined direction, the sleeve 12 rotates, and as a result, the spindle 11 screwed to the sleeve 12 moves downward without rotating, and as shown in FIG. The diaphragm 5 is pressed by the valve seat 4A, and the flow of fluid from the main flow path 2 to the branch flow path 3 is blocked. By turning the handle 6 in the opposite direction to the above, the diaphragm 5 is separated from the valve seat 4A as shown in FIG. 1, the branch flow path 3 is communicated with the main flow path 2, and the branch flow path 3 side The fluid will flow to Thus, the flow of the fluid to the branch flow path 3 can be arbitrarily adjusted or completely shut off without affecting the main flow path 2 by a pressure loss or the like simply by pressing and separating the diaphragm 5 from the valve seat 4A. can do.

As described above, in the present invention, since the valve body is made of a synthetic resin material by injection molding, the inner surface of the flow path of the valve body is flat and the effective surface area is as small as possible. It is suitably used in a pipeline for transporting fluid such as sterile water and ultrapure water.

In the present invention, the material of the valve body is not limited to the synthetic resin material of the above-described embodiment, but may be other synthetic resin materials as long as the amount of elution into the fluid is possible. Less is preferred. Further, the shape of the receiving port of the main flow path may be a screw type or a flange type, and similarly, the receiving shape of the branch flow path may be a screw type, a flange type or a TS type. Further, in the above embodiment, the manual valve using the handle has been described, but it is needless to say that the present invention can be applied to an automatic valve equipped with an actuator for automatic operation.

[0017]

According to the first aspect of the present invention, there is provided a branch valve.
A synthetic resin branch valve provided with a branch portion by being incorporated in a piping path, comprising a substantially straight tubular main flow path, and a branch flow path intersecting and communicating with the main flow path. A weir is provided between the outflow port and the branch inflow port on the branch flow path side, and the valve body in which the branch flow path side of the weir is a smooth flow path is integrally formed of a synthetic resin material,
Since the upper surface of the weir is configured to be opened and closed between the main flow path and the branch flow path by being pressed / separated by the diaphragm, a branch portion can be provided by directly incorporating the pipe into the pipe path. Moreover, even when the diaphragm is opened and closed, a stagnation portion of a fluid in which bacteria are easily generated does not occur.
In addition, since adjustment or blocking of the flow of fluid to the branch channel side can be performed only by pressing and separating the diaphragm on the upper surface of the weir, the diaphragm is not subject to abrasion, and there is no outflow of fine particles into the fluid. Therefore, the performance and yield of the product are not affected. Further, since the valve body is made by injection molding from a synthetic resin material, the inner surface of the flow path of the valve body is flat and the effective surface area is as small as possible.

Therefore, the branch valve of the present invention is a pipe for transporting pure water or ultrapure water used in a semiconductor integrated circuit manufacturing line, aseptic water used in the manufacture and preparation of pharmaceuticals, or liquids related to foodstuffs. It is suitable for use in branch roads.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a plan view showing a valve body.

FIG. 4 is a longitudinal sectional view showing a state in which a diaphragm is closed, with a part thereof omitted.

FIG. 5 is a reference view showing a use state in which a branch portion is provided using a conventional valve.

FIG. 6 is a longitudinal sectional view showing a conventionally known branch valve.

FIG. 7 is a longitudinal sectional view showing a conventionally known branch valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve main body 2 Main flow path 2A Branch outflow path 3 Branch flow path 3A Branch inflow path 4 Weir 4A Valve seat 5 Diaphragm

Claims (1)

(57) [Claims] 1. A synthetic resin branch valve that is provided in a pipe to provide a branch portion, the main valve having a substantially straight tubular main flow path,
A branch flow path intersecting and communicating with the main flow path, a weir is provided between the branch flow outlet on the main flow path side and the branch flow inlet on the branch flow path side, and the branch flow path side of the weir is The valve body having a smooth flow path is integrally formed of a synthetic resin material, and the upper surface of the weir is pressed by a diaphragm.
A branch valve configured to open and close between a main flow path and a branch flow path by being separated.