JP3135451B2 - Non-retention valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device used for a fluid transport pipe, and more particularly, to a non-stagnant valve device having a structure in which fluid in a valve chamber space does not stay when a valve is opened. is there.

[0002]

2. Description of the Related Art Conventionally, a valve having a structure as shown in FIG.

In particular, bellows seal valves as shown in FIG. 7 are employed in the semiconductor industry, medicine, biotechnology industry and the like. This valve has an excellent feature that the sliding part between the valve shaft and the bonnet part is not in contact with the liquid at all by the bellows-like diaphragm, so that particles generated in the sliding part are prevented from being mixed into the fluid. Have.

[0004]

However, in the valve having the structure as shown in FIG. 6, since the fluid stays in the valve chamber space 6, the fluid which generates sediment or coagulated material by the stay is generated. It was unsuitable for transportation piping.

In the bellows seal valve having the structure shown in FIG. 7, since the fluid stays in the valve chamber space 6 around the bellows-like diaphragm 15, the fluid is particularly used in the semiconductor industry, medicine, biotechnology and the like. In the case of the used ultrapure water or chemical solution, there is a problem that bacteria are generated in the fluid or the purity of the fluid is reduced due to long-term stagnation.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a non-stagnation valve device in which fluid in a valve chamber space does not stay when a valve is opened.

[0007]

The construction of the present invention for solving the above-mentioned problems will be described with reference to FIG. The non-stagnation valve device of the present invention is a valve device that performs opening / closing of a valve and flow control by a valve element 4 disposed in a valve chamber 5 located at an intermediate portion between an inlet flow path 2 and an outlet flow path 3 inside a valve body 1. , The valve chamber 5 is provided with a bypass portion 7 communicating with a space portion 6 thereof, and a pressure reducing device 8 having a pressure reducing portion 9 formed of a throttle mechanism and a bypass portion 10 communicating with the pressure reducing portion 9 is provided by a valve body. 1, the two bypass sections 7,
10 are communicated with each other (by a communication passage 13).

[0008] The communication method of the two bypass parts in the present invention is as follows.
The communication may be performed outside the valve main body as shown in FIG. 1, or a communication passage 13 formed of a through hole may be provided in the valve main body as shown in FIG.

The material of the valve device of the present invention may be metal or plastic, and is not particularly limited. Further, the direction of the inflow and outflow of the fluid is not limited, and the fluid can be introduced from either side of the valve device, and there is no difference in the performance.

[0010]

The operation of the non-retention valve device of the present invention having the above-described structure is as follows. When the valve is opened, the fluid that has flowed in through the inlet channel 2 flows out of the outlet channel 3 through the valve body 4 and the valve chamber 5.

The pressure reducing device 8 provided on the valve body 1
Is designed so that the fluid pressure in the pressure reducing section 9 is lower than the fluid pressure in the valve chamber space 6, so that the fluid remaining in the valve chamber space 6 is discharged from the bypass section 7 communicating with the valve chamber space 6. Outflow, the communication path 1 with the bypass portion 10 of the pressure reducing device 8
3, and flows out to the decompression unit 9 via the bypass unit 10. Therefore, the fluid in the valve chamber space 6 does not stay when the valve is opened.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments, but it goes without saying that the present invention is not limited to these embodiments.

FIG. 1 is a longitudinal sectional view of a main part of a non-retaining valve device showing an embodiment of the present invention. In the figure, reference numeral 1 denotes a valve body, which is located at an intermediate portion between an inlet flow path 2 and an outlet flow path 3 provided therein and provided in a direction perpendicular to a flow path axis.
A valve body 4 screwed and fixed to a valve shaft 11 supported by a bonnet 12 located at an upper portion of the valve body 1 is disposed.

Reference numeral 7 denotes a bypass portion provided integrally with the valve body 1 so as to communicate the space 6 of the valve chamber 5 with the outside of the valve body 1. In addition, the bypass part 7 is provided in the valve body 1 by integral molding, but is not limited to this, and may be provided by a commercially available joint or the like. The bypass section 7 is preferably provided above the valve chamber 5 in consideration of the flow of the fluid in the valve chamber space 6.

Reference numeral 8 denotes a cylindrical pressure reducing device which is adhesively fixed in the outlet flow path 3 and is provided with a pressure reducing portion 9 by a throttle mechanism and a bypass portion 10 for communicating the pressure reducing portion 9 with the outside. In this embodiment, the pressure reducing device 8 is of a Venturi tube type, but may be of an orifice tube type, and is not limited to this. The method of fixing the decompression device 8 is not limited to bonding, but may be any method such as screwing or any other commonly employed method. Further, the pressure reducing section 9 may be provided in the outlet channel 3 by integral molding.

Further, the bypass section 10 is communicated with the bypass section 7 through a tubular communication path 13.

The operation of the non-retention valve device of the present embodiment having the above-described configuration is as follows. In FIG. 1, the fluid flowing into the valve device passes through the inlet channel 2 and the valve chamber 5 and then flows out of the valve device via the outlet channel 3 and the pressure reducing device 8.

In this state, the static pressure of the fluid in the valve chamber space 6 (hereinafter referred to as the fluid pressure) is P ₁ , and the fluid pressure in the outlet passage 3 upstream of the pressure reducing section 9 of the pressure reducing device 8 is P ₂ When the fluid pressure of the pressure reducing unit 9 is P ₃ and the fluid pressure downstream of the pressure reducing unit 9 is P ₄ , the fluid passing through the pressure reducing device 8 is contracted by the pressure reducing unit 9, so that the hydrodynamic action is performed. Accordingly, the following equation is established between the fluid pressures of the respective parts. P ₂ > P ₄ > P ₃ (1) On the other hand, the following formula is established by the fluid flowing into the valve device flowing out of the valve device. P ₁ > P ₂ (2) From equations (1) and (2), the following equation holds. P ₁ > P ₃ (3) From equation (3), the fluid pressure P _{1 in} the valve chamber space 6 and the pressure reducing section 9
A pressure difference (P ₁ −P ₃ ) is generated between the fluid pressure P ₃ and the fluid pressure P ₃ . Therefore, since the bypass portion 7 of the valve body 1 and the bypass portion 10 of the pressure reducing device 8 are communicated by the tubular communication passage 13, the fluid in the valve chamber space 6 flows from the bypass portion 7 to the communication passage 13 and the bypass portion 10. Through the flow path of the decompression device 8. (See arrow)

By the operation described above, the stagnation of the fluid in the valve chamber space 6 is avoided. Since the amount of fluid flowing through the communication path 13 depends on the pressure difference, it can be easily adjusted by appropriately changing the opening area of the pressure reducing unit 9 of the pressure reducing device 8. Further, the opening area of the decompression unit 9 is designed so that the expression (3) is satisfied even when the directions of the inflow and outflow of the fluid are reversed, that is, even when the fluid flows in from the outlet channel 3 side. Thus, the same function and effect as described above can be obtained. The valve device of the present embodiment type can be suitably used for a fluid transport pipe, which has been a major problem due to the generation of a sediment or a coagulated material due to the retention of the fluid.

FIG. 2 is a vertical sectional view showing a main part of a second embodiment of the present invention. In this embodiment, the two bypass sections 7, 10 are used.
The only difference from the first embodiment is that they are communicated with each other by a communication passage 13 formed of a through hole provided in the valve body 1. The other configuration and operation are the same as those in the first embodiment, and thus will not be described.

FIG. 3 is a longitudinal sectional view of a main part showing a third embodiment of the present invention. In this embodiment, the pressure reducing device 8 is mounted and fixed to the outside of the valve body 1, that is, to the flange portion 14 on the side of the outlet channel 3 (bolts and nuts are not shown), and the pressure reducing portion 9 is located at a position facing the outlet channel 3. Is different from the first embodiment. The other configuration and operation are the same as those in the first embodiment, and thus will not be described.

When the pressure reducing device is provided outside the valve body, it is needless to say that the pressure reducing device must be arranged so that the pressure reducing portion is located at a position facing the inlet flow path or the outlet flow path.

FIG. 4 is a longitudinal sectional view of a main part showing a fourth embodiment of the present invention. This embodiment is an improvement of the conventional bellows seal valve shown in FIG. In the figure, reference numeral 1 denotes a valve main body, which is provided with an inlet channel 2 and an outlet channel 3 provided therein.
A bonnet 12 located in the upper part of the valve body 1 is provided in the valve chamber 5 which is located in the middle of the
The valve body 4 screwed and fixed to the valve shaft 11 supported by the valve shaft 11 is disposed.

Reference numeral 15 denotes a bellows-like diaphragm made of PTFE. The valve body 4 is provided at a lower end portion, and a main body fixing portion 16 is integrally provided at the upper peripheral portion of the same material. ing. The main body fixing portion 16 is pressed and fixed to the valve main body 1 by the bonnet 12 from above.

Reference numeral 7 denotes a bypass portion which communicates with the space 6 of the valve chamber 5 and is provided integrally with the valve body 1. The bypass portion 7 is preferably provided above the valve chamber 5 in consideration of the flow of the fluid in the valve chamber space 6 as described above. 8 is attached and fixed to the flange portion 14 on the outlet flow path 3 side (bolts and nuts are not shown), has a pressure reducing portion 9 by a throttle mechanism, and has a bypass portion 10 communicating with the pressure reducing portion 9. It is a cylindrical decompression device provided by integral molding.

The bypass unit 10 is provided with the bypass unit 7.
And a tubular communication passage 13.

In this embodiment, the pressure reducing device 8 is mounted and fixed to the flange portion 14 on the side of the outlet channel 3, but may be inserted and fixed in the outlet channel 3 as in the first embodiment. good.

The operation of the present embodiment having the above-described structure is the same as that of the first embodiment and will not be described. The valve device of this embodiment has a structure in which the sliding portion between the valve shaft 11 and the bonnet portion 12 does not come into contact with the liquid at all due to the bellows-like diaphragm, so that particles generated in the sliding portion are not mixed into the fluid. In addition to preventing water, the fluid around the bellows-like membrane does not stay, preventing the generation of bacteria and reducing the purity of the fluid. It can be suitably used.

FIG. 5 is a longitudinal sectional view showing a main part of a fifth embodiment of the present invention. This embodiment is an improvement of a general ball valve. In the figure, reference numeral 17 denotes a valve body, in which a ball valve element 20 is disposed in a valve chamber 21 located at an intermediate portion between an inlet flow path 18 and an outlet flow path 19 provided therein. The valve is opened and closed by rotating the ball valve body 90 by 90 degrees.

Reference numeral 23 denotes a communication hole for communicating the flow path 22 in the ball valve body 20 with the space 24 of the valve chamber 21. In this embodiment, the number of communication holes 23 is one, but a plurality of communication holes may be provided.

Reference numeral 25 denotes a bypass portion, which is inserted and fixed to the valve body 17 so as to communicate with the valve chamber space 24.

Reference numeral 8 denotes a cylindrical decompression unit which is mounted and fixed on a flange portion on the outlet flow path 19 side, has a decompression unit 9 by a restricting mechanism, and is provided with a bypass unit 10 communicating with the decompression unit 9. Device.

The bypass unit 10 is connected to the bypass unit 2.
5 and a tubular communication path 13.

The operation of the present embodiment having the above configuration is as follows. Most of the fluid flowing from the inlet flow path 18 flows out to the outlet flow path 19 and the pressure reducing unit 9 of the pressure reducing device 8, but a part of the fluid passes through the communication hole 23 provided in the ball valve body 20. It flows out to the valve chamber space 24.

In this state, the fluid pressure in the flow path 22 in the ball valve body 20 is P ₅ , the fluid pressure in the valve chamber space 24 is P ₆ , and the fluid pressure upstream of the pressure reducing section 9 is P ₇ . Assuming that the fluid pressure of the pressure reducing unit 9 is P ₈ and the fluid pressure downstream of the pressure reducing unit 9 is P ₉ , the following equation is established. P ₇ > P ₉ > P ₈ (4) The flow path 22 and the valve chamber space 24 are communicated with each other through the communication hole 23, and the valve is a ball valve that hardly generates fluid resistance when the valve is fully opened. The following equation holds. P ₅ ≒ P ₆ ≒ P ₇ (5) From equations (4) and (5), the following equation is established. P ₆ > P ₈ (6) From equation (6), the pressure difference (P ₆ −P ₈ ) between the fluid pressure P _{6 in} the valve chamber space 24 and the fluid pressure P _{8 in the} pressure reducing section 9. Occurs.

Accordingly, the part of the fluid flows out of the flow path 22 to the flow path in the pressure reducing device 8 through the valve chamber space 24, the bypass part 25, and the communication path 13. In other words, in the conventional ball valve, the fluid in the valve chamber space 24, which has been a stagnant portion when the valve is fully opened, always flows.

Conventionally, ball valves have been adopted in all fields because they are valves which are simple in opening and closing operations and have a simple structure and are economical. However, stagnation of fluid in the valve chamber space has been a major drawback. . However, this problem can be easily solved by a simple improvement of a general ball valve as in this embodiment.

The present applicant manufactured the valve device of this embodiment using transparent plastic to check the outflow state of the fluid in the valve chamber space, and conducted a water flow experiment. As a result, it was confirmed that the fluid in the valve chamber space continuously flowed out to the pressure reducing section without staying.

[0039]

The following effects can be obtained by using the non-retention valve device of the present invention having the structure as described above. 1. The transportation cost of the fluid that has caused sediment or coagulated matter due to the stagnation can be reduced. That is, since no sediment or coagulation is generated, the quality of the fluid is maintained, and the trouble of removing these with a filter or the like can be omitted. 2. In particular, it is possible to prevent the generation of bacteria and a decrease in fluid purity in a transportation pipe for ultrapure water or chemical solution used in the semiconductor industry, medicine, biotechnology, and the like. 3. Cleaning and maintenance are easy because scales and the like hardly adhere to the inside of the valve device. Therefore, the life of the valve device is increased and the valve device is economical. 4. When disinfecting or disinfecting the inside of the pipe, this chemical solution spreads to every corner of the valve device, so that disinfecting, disinfecting and the subsequent rise time can be shortened.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part showing a first embodiment of a non-retention valve device of the present invention.

FIG. 2 is a longitudinal sectional view of a main part showing a second embodiment of the non-retention valve device of the present invention.

FIG. 3 is a longitudinal sectional view of a main part showing a third embodiment of the non-retention valve device of the present invention.

FIG. 4 is a vertical sectional view of a main part showing a fourth embodiment of the non-retention valve device of the present invention.

FIG. 5 is a longitudinal sectional view of a main part showing a fifth embodiment of the non-retention valve device of the present invention.

FIG. 6 is a longitudinal sectional view of a main part of a conventional valve.

FIG. 7 is a longitudinal sectional view of a main part of a conventional bellows seal valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Valve main body 2 ... Inlet flow path 3 ... Outlet flow path 4 ... Valve element 5 ... Valve chamber 6 ... Valve chamber space part 7 ... Bypass part 8 ... Pressure reducing device 9 ... Pressure reducing part 10 ... Bypass part 11 ... Valve shaft 12 ... Bonnet 13 Communication path 14 Flange 15 Bellows-like diaphragm 16 Body fixing part 17 Valve body 18 Inlet flow path 19 Outlet flow path 20 Valve element 21 Valve chamber 22 Flow path 23 Communication hole 24 … Valve space 25… Bypass

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16K 41/10 F16K 47/04

Claims (3)

(57) [Claims] 1. A valve body having an inlet flow path, an outlet flow path, and a valve chamber located between the two flow paths, and a valve element disposed in the valve chamber. In the valve device configured to open and close the valve and control the flow rate, the valve chamber is connected to a bypass portion communicating with a space portion thereof, and the valve body is connected to a pressure reducing portion including a throttle mechanism and the pressure reducing portion. A non-residence valve device, wherein a decompression device having a bypass portion is provided, and both bypass portions are communicated with each other. 2. The non-retentive valve device according to claim 1, wherein the pressure reducing section is disposed in an inlet flow passage or an outlet flow passage of the valve body. 3. The non-retention valve device according to claim 1, wherein the pressure reducing section is mounted and fixed outside the valve body.