JP2020190284A - Valve mechanism - Google Patents

Abstract

To provide a valve mechanism which can properly cope with erosion generated by friction or the like with fluid, and can reduce a time and labor for a component exchange.SOLUTION: At a normal time, a downstream valve 42 is moved to an arrow 95 by a rotation operation of an operation lever 48, and the downstream valve is closed by blocking a downstream opening 22 of a valve port member 20, however, when erosion (mechanical friction) is generated at the downstream valve 42 and the downstream opening 22, an upstream valve 41 is moved to an arrow 96 by the rotation operation of the operation lever 48 without exchanging a component, and the upstream valve is closed by blocking an upstream opening 21 of the valve port member 20 by using the upstream valve 41. Here, a narrow flow passage can be formed over the whole periphery of the upstream opening 21 or the downstream opening 22 by slightly opening the upstream opening 21 or the downstream operation 22 of the valve port member 20, and foreign matters can be blown out by the fluid pressure of a drain or the like which passes the flow passage, thus cleaning the flow passage.SELECTED DRAWING: Figure 1

Description

The valve mechanism according to the present application relates to a technique for a valve structure for controlling a fluid flow.

As a valve mechanism for controlling the flow of the fluid, there is a nozzle type steam trap disclosed in Patent Document 1 described later. This nozzle-type steam trap is installed in the steam piping system, and drains (condensed water) generated by heat exchange of steam are appropriately discharged to the outside of the piping.

In the nozzle-type steam trap according to Patent Document 1, a nozzle 5 is arranged between the drain inlet 11 and the drain outlet 12, and the first drain chamber 15 and the first drain chamber 15 and the drain outlet 12 are located between the nozzle 5 and the outlet 12. A second drain chamber 17 is provided. An adjustment valve 6 having a needle 62 is attached to the second drain chamber 17.

The adjusting valve 6 can be operated from the outside of the steam trap, and by operating the adjusting valve 6, the needle 62 moves up and down in the figure. As the needle 62 moves forward and backward, the area of the inlet of the port 18 communicating with the second drain chamber 17 changes, whereby the flow rate of the drain can be adjusted (Patent Document 1, paragraphs 0022 and 0023). ..

JP-A-2019-15341

In the valve mechanism, friction with a fluid flowing at high speed may cause erosion (mechanical wear) in the valve body and valve seat. When the valve body or the valve seat is deformed by this erosion, the valve closing and the flow rate adjustment of the fluid become insufficient due to the gap due to the deformation, and the proper valve action is hindered. In the technique disclosed in Patent Document 1 described above, when an erosion occurs, it cannot be dealt with, so that there is a problem that parts need to be replaced.

Therefore, in order to solve these problems, the valve mechanism according to the present application provides a valve mechanism capable of appropriately dealing with erosion caused by friction with a fluid and reducing the trouble of replacing parts. That is the issue.

The valve mechanism according to the present application is
A valve seat portion having a valve seat flow path that allows the primary side opening and the secondary side opening to communicate with each other, and a valve seat portion that allows fluid flowing in from the primary side opening to flow out to the secondary side opening through the valve seat flow path.
An adjustment unit that is inserted into the valve seat flow path of the valve seat and can be moved according to the adjustment operation.
It is a primary side valve body provided in the adjusting part and located toward the primary side opening of the valve seat part, and moves forward and backward as the adjusting part moves to adjust the opening of the primary side opening. body,
It is a secondary side valve body provided in the adjusting part and located toward the secondary side opening of the valve seat part, and moves forward and backward as the adjusting part moves to adjust the opening of the secondary side opening. Secondary valve body,
Is equipped with
The primary side valve body is arranged at a position that does not interfere with the adjustment of the opening degree of the secondary side opening by the secondary side valve body.
The secondary side valve body is arranged at a position that does not interfere with the adjustment of the opening degree of the primary side opening by the primary side valve body.
It is characterized by that.

In the valve mechanism according to the present application, a primary side valve body and a secondary side valve body are provided in the adjusting portion. The primary side valve body is arranged at a position that does not interfere with the adjustment of the opening degree of the secondary side opening by the secondary side valve body, and the secondary side valve body opens the primary side opening by the primary side valve body. It is placed in a position that does not interfere with the adjustment of the degree.

Therefore, when erosion occurs in one of the primary side valve body and the secondary side valve body, the opening degree of the valve seat portion can be adjusted by using the other side of the primary side valve body or the secondary side valve body. For this reason, it is possible to appropriately deal with the erosion caused by friction with the fluid or the like with a simple configuration, and it is possible to reduce the trouble of replacing parts.

It is a partial cross-sectional view of the bypass valve 1 which shows 1st Embodiment of the valve mechanism which concerns on this application. It is an enlarged partial sectional view of the vicinity of the valve mouth member 20 of the bypass valve 1 shown in FIG. It is an enlarged partial sectional view of the vicinity of the valve mouth member 20 of the bypass valve 1 shown in FIG. 1, and is the figure which shows the state which closed the downstream opening 22 of the valve mouth member 20. FIG. 3 is an enlarged partial cross-sectional view showing a state in which the downstream opening 22 of the valve opening member 20 is slightly opened from the state shown in FIG. It is an enlarged partial sectional view of the vicinity of the valve mouth member 20 of the bypass valve 1 shown in FIG. 1, and is the figure which shows the state which closed the upstream opening 21 of a valve mouth member 20. FIG. 5 is an enlarged partial cross-sectional view showing a state in which the upstream opening 21 of the valve opening member 20 is slightly opened from the state shown in FIG. It is a block diagram of the piping system for explaining the function of the bypass valve 1.

[Explanation of terms in the embodiment]
The main terms shown in the embodiments correspond to the following elements of the valve mechanism according to the present application, respectively.
Valve port member 20 ・ ・ ・ Valve seat upstream opening 21 ・ ・ ・ Primary side opening Upstream throttle 21b ・ ・ ・ Primary side bending upstream end face 21f ・ ・ ・ Primary side end face Downstream opening 22 ・ ・ ・ Secondary side opening Downstream Squeezing part 22b ・ ・ ・ Secondary side bending part Downstream end face 22f ・ ・ ・ Secondary side end face Valve opening space 29 ・ ・ ・ Valve seat flow path Casing lid hole 31a ・ ・ ・ Secondary side support part Operating member 40 ・ ・ ・Adjustment part Upstream valve 41 ・ ・ ・ Primary side valve body Upstream valve flange part 41a ・ ・ ・ Primary side obstruction part Upstream column part 41c ・ ・ ・ Primary side approach part Downstream valve 42 ・ ・ ・ Secondary side valve body Downstream valve collar part 42a ・ ・ ・ Secondary side obstruction downstream columnar part 42c ・ ・ ・ Secondary side approach part Connecting bar 45 ・ ・ ・ Connecting part Support space 51 ・ ・ ・ Primary side support part

[First Embodiment]
The first embodiment of the valve mechanism according to the present application will be described by taking a bypass valve as an example.
(Explanation of bypass valve function)
FIG. 7 is a block diagram of a piping system for steam transfer installed in an industrial plant or the like. The main pipe 70 transfers high-temperature and high-pressure steam to a predetermined supply destination facility. Drain is generated in the main pipe 70 by heat exchange of the transferred steam, and in order to discharge this drain, branch pipes 71 are connected to the main pipe 70 everywhere, and steam traps 79 are provided in each branch pipe 71. The steam trap 79 is an automatic valve that operates to properly discharge the drain to the outside of the pipe and prevent steam from leaking as much as possible.

There are various types of steam traps, but float traps have a hollow float built into the valve chamber. Normally, this float closes the drain outlet formed near the bottom of the valve chamber, but when drain flows into the valve chamber, this float floats as the drain stays, and the drain outlet is opened. Open.

Since the drain discharge port is opened, the drain accumulated in the valve chamber is automatically discharged from the drain discharge port toward the drain recovery pipe 72 in response to the high pressure in the pipe. After draining the drain, the float descends and returns to its original position, closing the drain outlet again.

Here, the branch pipe 71 is provided with a bypass pipe 73 connecting the front and rear of the steam trap 79, and the bypass valve 1 is attached to the bypass pipe 73. The bypass valve 1 backs up and assists the steam trap 79 provided on the branch pipe 71.

That is, when it becomes necessary to replace the steam trap 79 due to a device failure, the on-off valves 74 and 75 arranged before and after the steam trap 79 are closed and the replacement work is performed, but the drain is discharged during this period. You will not be able to. Therefore, the bypass valve 1 is opened, and the drain is discharged through the bypass pipe 73 while the steam trap 79 is being replaced.

Further, when the piping system is started, the piping is filled with initial air, and it is necessary to exhaust the initial air to the outside of the piping in order to eliminate the air binding (air obstacle) caused by the initial air. In such a case, by fully opening the bypass valve 1, exhaust is promptly performed through the bypass pipe 73. Further, in order to supplement the drain discharge function of the steam trap 79, the degree of opening of the bypass valve 1 may be adjusted, and a small amount of drain may be constantly discharged through the bypass pipe 73. Therefore, such a bypass valve 1 generally has a function of finely adjusting the flow rate of the fluid.

(Explanation of the configuration of bypass valve 1)
Next, the overall configuration of the bypass valve 1 will be described. FIG. 1 is a partial cross-sectional view of the bypass valve 1. As shown in FIG. 1, the bypass valve 1 includes a casing 11 and a casing lid 31, and the casing 11 and the casing lid 31 are fixed by bolts with the gasket 30 interposed therebetween. A cylindrical downstream inner chamber 10 that opens toward the upper part is formed in the casing 11, and the casing lid 31 is attached so as to cover the upper opening.

Further, the inflow port 12 and the outflow port 13 are coaxially formed in the casing 11, and a bypass pipe 73 (FIG. 7) is connected to each of them. The inflow port 12 communicates with the upstream passage 15 and the upstream inner chamber 16 in the casing 11. The upstream inner chamber 16 is arranged below the downstream inner chamber 10 described above and communicates with the downstream inner chamber 10. The upstream inner chamber 16 has an opening toward the bottom of the casing 11, and a bottom lid 50 is screwed into the opening at the bottom.

A cylindrical valve port member 20 is located at a portion where the downstream inner chamber 10 and the upstream inner chamber 16 communicate with each other. The valve port member 20 is screwed into and attached to the casing 11 via a screw mechanism. A valve port flow path 29 penetrating in the vertical direction is formed inside the valve port member 20, and the central axis of the valve port flow path 29 is located on the reference axis 99. The downstream inner chamber 10 communicates with the outflow port 13 via the downstream passage 17.

Fluids such as drain and air flowing in from the inflow port 12 sequentially flow through the upstream passage 15 and the upstream inner chamber 16 along the direction of arrow 91, and enter the valve port flow path 29 of the valve port member 20. Then, this fluid passes through the valve port flow path 29, flows in the downstream inner chamber 10 and the downstream passage 17 in sequence along the direction of arrow 92, and is discharged through the outflow port 13. In the figure, the lower part of the valve port member 20 is upstream and the upper part is downstream according to the flow of the fluid.

As shown in FIG. 1, a casing lid hole 31a is formed in the casing lid 31 so that the central axis is located on the reference axis 99, and a cylindrical operating member 40 penetrates the casing lid hole 31a. It is arranged in. The central axis of the operating member 40 is also located on the reference axis 99.

The operation member 40 includes an operation bar 48 on which a screw portion 40b is formed, and the screw portion 40b is screwed into and attached to a screw groove formed on the inner surface of the casing lid hole 31a. An operation groove 40a is formed at the rear end of the operation bar 48. In the figure, the operating member 40 is shown not as a cross-sectional view but as a side view showing the appearance.

When a tool is fitted into the operation groove 40a formed at the rear end of the operation bar 48 and the operation is rotated, the operation member 40 moves up and down in the directions of arrows 95 and 96 according to the screw mechanism of the screw portion 40b. A cap 38 is screwed and attached to the upper part of the casing lid 31, and the cap 38 is located so as to cover the rear end of the operation bar 48. The cap 38 prevents the operation bar 48 from rotating due to erroneous operation.

The diameter of the upper part of the casing lid hole 31a of the casing lid 31 is slightly larger, and the packing 36 is fitted therein, and the packing 36 is pressurized by screwing the pressing member 37 to maintain the airtightness inside the casing 11. ing. The operation bar 48 of the operation member 40 penetrates the central hole of the packing 36 and the pressing member 37.

An integrally configured downstream valve 42, connecting bar 45, upstream valve 41, and support bar 46 are provided on the tip side of the operation bar 48. As shown in FIG. 1, the connecting bar 45 is located in the valve port flow path 29 of the valve port member 20, and is slightly longer in the axial direction than the valve port flow path 29. The support bar 46 is inserted into the support space 51 formed in the bottom lid 50 and is held so as to be vertically movable in the directions of arrows 95 and 96. Since the central axis of the support space 51 is located on the reference axis 99, the support bar 46 is supported by the support space 51, so that the connecting bar 45 of the operating member 40 becomes the central axis in the valve opening flow path 29. Is held without deviating from the reference axis 99.

FIG. 2 is an enlarged partial cross-sectional view of the vicinity of the valve port member 20. As shown in FIG. 2, the opening portion on the upstream side of the valve port member 20 is formed as the upstream opening 21, and the opening portion on the downstream side is formed as the downstream opening 22. The cylindrical surface 23, which is the inner surface of the valve port flow path 29 of the valve port member 20, has a cylindrical shape having a constant diameter.

In the valve opening member 20, the peripheral edge of the downstream opening 22 is a flat downstream end surface 22f, and the downstream first tapered surface 22a whose diameter gradually decreases toward the valve opening flow path 29 continues to the downstream end surface 22f. It is formed. Further, on the downstream first tapered surface 22a, a downstream second tapered surface 22c whose diameter gradually increases toward the valve port flow path 29 is continuously formed, and the downstream second tapered surface 22c is a cylindrical surface. Continue to 23.

The boundary between the downstream first tapered surface 22a and the downstream second tapered surface 22c is the downstream throttle portion 22b, and when the reference axis 99 is in the vertical direction, the downstream throttle portion 22b is formed so as to be located in the horizontal circumferential direction. ing. The downstream throttle portion 22b is the portion having the smallest diameter in the valve port flow path 29.

On the other hand, the downstream valve 42 has a downstream valve flange portion 42a that projects toward the outer peripheral direction. The flat surface of the downstream valve flange portion 42a on the valve port member 20 side is formed as the downstream valve contact surface 42e, and this downstream valve contact surface 42e is located parallel to the downstream end surface 22f of the valve port member 20. Further, the downstream valve contact surface 42e is configured to have a size capable of covering and closing the downstream opening 22 of the valve opening member 20. That is, when the operating member 40 moves in the direction of arrow 95, the downstream valve contact surface 42e of the downstream valve flange portion 42a abuts on the downstream end surface 22f of the valve opening member 20 and closes the downstream opening 22 of the valve opening member 20. ..

Further, the downstream valve flange portion 42a is formed with a downstream valve first tapered portion 42b whose diameter gradually decreases toward the valve opening member 20. The downstream valve first tapered portion 42b is parallel to the downstream first tapered surface 22a of the valve opening member 20, the operating member 40 moves in the direction of arrow 95, and the downstream valve contact surface 42e of the downstream valve flange portion 42a becomes. When the valve port member 20 comes into contact with the downstream end surface 22f and reaches the limit position, the downstream valve first tapered portion 42b abuts on the downstream first tapered surface 22a of the valve port member 20.

The downstream valve first tapered portion 42b is continuously formed with a downstream valve columnar portion 42c projecting toward the valve opening member 20. The downstream valve columnar portion 42c has a cylindrical shape having a constant diameter, and when the operating member 40 moves in the direction of arrow 95, it enters the valve port flow path 29. The cylindrical diameter of the downstream valve columnar portion 42c is slightly smaller than the diameter of the circle defined by the downstream throttle portion 22b formed on the valve opening member 20. As a result, the downstream valve first tapered portion 42b of the downstream valve 42 is formed slightly longer in the valve opening flow path 29 than the downstream first tapered surface 22a of the valve opening member 20.

On the downstream valve columnar portion 42c, a downstream valve second tapered portion 42d whose diameter gradually decreases toward the valve opening member 20 is continuously formed. The downstream valve second taper portion 42d is continuous with the connecting bar 45.

The vicinity of the downstream opening 22 of the valve port member 20 and the downstream valve 42 have the above configurations. The configuration of the valve port member 20 in the vicinity of the upstream opening 21 and the upstream valve 41 also has a configuration symmetrical to that of the downstream opening 22 and the downstream valve 42 with the connecting bar 45 interposed therebetween.

That is, in the valve port member 20, the peripheral edge of the upstream opening 21 is a flat upstream end surface 21f, and the upstream first tapered surface 21a whose diameter gradually decreases toward the valve port flow path 29 continues to this upstream end surface 21f. Is formed. Further, on the upstream first tapered surface 21a, an upstream second tapered surface 21c whose diameter gradually increases toward the valve port flow path 29 is continuously formed, and the upstream second tapered surface 21c is a cylindrical surface. Continue to 23.

The boundary between the upstream first tapered surface 21a and the upstream second tapered surface 21c is the upstream throttle portion 21b, and when the reference axis 99 is in the vertical direction, the upstream throttle portion 21b is formed located in the horizontal circumferential direction. ing. The upstream throttle portion 21b is the portion having the smallest diameter in the valve port flow path 29.

On the other hand, the upstream valve 41 has an upstream valve flange portion 41a projecting in the outer peripheral direction above the support bar 46. The flat surface of the upstream valve flange portion 41a on the valve port member 20 side is formed as an upstream valve contact surface 41e, and this upstream valve contact surface 41e is located parallel to the upstream end surface 21f of the valve port member 20. Further, the upstream valve contact surface 41e is configured to have a size capable of covering and closing the upstream opening 21 of the valve opening member 20. That is, when the operating member 40 moves in the direction of arrow 96, the upstream valve contact surface 41e of the upstream valve flange portion 41a abuts on the upstream end surface 21f of the valve opening member 20 and closes the upstream opening 21 of the valve opening member 20. ..

Further, the upstream valve flange portion 41a is formed with an upstream valve first tapered portion 41b whose diameter gradually decreases toward the valve opening member 20. The upstream valve first tapered portion 41b is parallel to the upstream first tapered surface 21a of the valve opening member 20, the operating member 40 moves in the direction of arrow 96, and the upstream valve contact surface 41e of the upstream valve flange portion 41a becomes. When the valve port member 20 comes into contact with the upstream end surface 21f and reaches the limit position, the upstream valve first tapered portion 41b abuts on the upstream first tapered surface 21a of the valve port member 20.

The upstream valve first tapered portion 41b is continuously formed with an upstream valve columnar portion 41c projecting toward the valve opening member 20. The upstream valve columnar portion 41c has a cylindrical shape having a constant diameter, and when the operating member 40 moves in the direction of arrow 96, it enters the valve port flow path 29. The cylindrical diameter of the upstream valve columnar portion 41c is slightly smaller than the diameter of the circle defined by the upstream throttle portion 21b formed on the valve opening member 20. As a result, the upstream valve first tapered portion 41b of the upstream valve 41 is formed slightly longer in the valve port flow path 29 than the upstream first tapered surface 21a of the valve port member 20.

The upstream valve columnar portion 41c is continuously formed with an upstream valve second tapered portion 41d whose diameter gradually decreases toward the valve opening member 20. The upstream valve second taper portion 41d is continuous with the connecting bar 45.

(Explanation of measures to be taken when erosion occurs in the valve port member 20 etc.)
The bypass valve 1 in the present embodiment normally uses the downstream valve 42 to adjust the opening and closing of the valve, and does not use the upstream valve 41. FIG. 3 shows a state in which the downstream opening 22 of the valve opening member 20 is completely closed by using the downstream valve 42.

When closing the downstream opening 22 of the valve opening member 20 using the downstream valve 42, the cap 38 shown in FIG. 1 is removed, a tool is fitted into the operating groove 40a of the operating member 40 and tightened, and the operating member 40 is tightened. Move to the limit position in the direction of arrow 95.

As a result, the downstream valve contact surface 42e of the downstream valve 42 comes into contact with the downstream end surface 22f of the valve opening member 20, and the downstream valve first tapered portion 42b of the downstream valve 42 becomes the downstream first tapered surface 22a of the valve opening member 20. The downstream opening 22 is closed by contacting the valve port member 20, and the valve port member 20 is completely closed.

When adjusting the flow rate of a fluid such as drain or air in the bypass valve 1, from the state shown in FIG. 3, a tool is fitted into the operating groove 40a of the operating member 40 to loosen it, and the operating member 40 is moved in the direction of arrow 96. Let me. Then, when the downstream valve second tapered portion 42d is located at the level of the downstream throttle portion 22b (see FIG. 2) of the valve opening member 20, the downstream opening 22 of the valve opening member 20 follows the inclination of the downstream valve second tapered portion 42d. The degree of opening of the fluid changes and the flow rate of the fluid is adjusted.

In this way, the downstream valve 42 is normally used to open and close the valve and adjust the flow rate, but due to friction with the fluid flowing at high speed, the downstream valve 42 and the downstream opening 22 of the valve opening member 20 are eroded. May occur. When the downstream valve 42 and the downstream opening 22 of the valve opening member 20 are deformed by this erosion, the valve closing and the adjustment of the fluid flow rate become insufficient due to the gap due to the deformation, and the proper valve action is hindered. When erosion occurs, fluid leakage noise is generated with the downstream opening 22 of the valve opening member 20 completely closed, so it is recognized that erosion has occurred from the outside of the bypass valve 1. can do.

In the bypass valve 1 of the present embodiment, when an erosion occurs in the downstream valve 42 or the downstream opening 22 of the valve opening member 20, the upstream valve 41 is used without replacing the downstream valve 42 or the like. Open and close. That is, when it is determined that an erosion has occurred in the downstream valve 42 or the downstream opening 22 of the valve opening member 20, a tool is fitted into the operating groove 40a of the operating member 40 to loosen it, and the operating member 40 is moved in the direction of arrow 96. Move.

As a result, the upstream valve contact surface 41e of the upstream valve 41 comes into contact with the upstream end surface 21f of the valve port member 20, and the upstream valve first tapered portion 41b of the upstream valve 41 becomes the upstream first tapered surface 21a of the valve port member 20. The upstream opening 21 can be closed by abutting, and the valve opening member 20 can be completely closed. FIG. 5 shows a state in which the upstream opening 21 of the valve opening member 20 is completely closed by using the upstream valve 41.

Then, when adjusting the flow rate of a fluid such as drain or air, the tool is fitted and tightened in the operating groove 40a of the operating member 40 from the state shown in FIG. 5, and the operating member 40 is moved in the direction of arrow 95. Then, when the upstream valve second tapered portion 41d is located at the level of the upstream throttle portion 21b of the valve opening member 20, the degree of opening of the upstream opening 21 of the valve opening member 20 according to the inclination of the upstream valve second tapered portion 41d. It changes and the flow rate of the fluid is adjusted.

In the present embodiment, the length of the connecting bar 45 of the operating member 40 in the axial direction is longer than the length of the valve port flow path 29 of the valve port member 20 in the axial direction, so that the downstream valve 42 The upstream valve 41 does not interfere with the closing or opening of the downstream opening 22 of the valve opening member 20 using the upstream valve 41, and conversely, the upstream opening 21 of the valve opening member 20 using the upstream valve 41 is closed or opened. The downstream valve 42 does not interfere with the adjustment of the degree. Here, the fact that the other upstream valve 41 or downstream valve 42 does not interfere when one of the upstream valve 41 or the downstream valve 42 closes or adjusts the opening has an effect on the other when closing or adjusting the opening by one. It means that one can perform complete valve closing and opening adjustment independently without giving.

In the normal state, the upstream valve 41 is used to open and close the valve, and when an erosion occurs in the upstream valve 41 or the upstream opening 21 of the valve opening member 20, the downstream valve 42 is used to open and close the valve. May be done.

As described above, the bypass valve 1 according to the present embodiment is downstream when erosion occurs in one of the downstream opening 22 of the downstream valve 42 and the valve opening member 20 or the upstream opening 21 of the upstream valve 41 and the valve opening member 20. Since the valve opening member 20 can be opened and closed by using the valve 42 or the other of the upstream valve 41, erosion can be easily and appropriately dealt with with a simple configuration, and the labor of parts replacement can be reduced. Can be done.

(Explanation of cleaning operation of valve port member 20 etc.)
Foreign matter such as rust and scale (scale) may flow into the valve mechanism such as the bypass valve 1 together with fluid such as drain and steam. Then, the valve mechanism such as the bypass valve 1 may adjust the flow rate of the fluid by narrowing the space between the valve body (upstream valve 41 or downstream valve 42) and the valve seat (valve opening member 20). Foreign matter often adheres to and accumulates around the valve body and valve seat. If such foreign matter adheres and accumulates, the flow rate adjustment and valve closing become insufficient, and the proper valve action is hindered.

Therefore, the bypass valve 1 in the present embodiment can perform a cleaning operation of the valve port member 20 and the like as a part of maintenance, and the upstream opening 21 or the downstream opening of the valve port member 20 is set to a minute opening state. Performs cleaning operation.

That is, when cleaning the area around the downstream opening 22 of the downstream valve 42 and the valve opening member 20, the tool is fitted into the operation groove 40a (FIG. 1) of the operation bar 48 from the completely closed state shown in FIG. The operation member 40 is slightly moved in the direction of arrow 96, and the downstream opening 22 is slightly opened. FIG. 4 is an enlarged view showing a state in which the downstream opening 22 is slightly opened.

By slightly moving the operating member 40 in the direction of arrow 96, a gap is provided between the downstream end surface 22f and the downstream valve contact surface 42e, and between the downstream first tapered surface 22a and the downstream valve first tapered surface 42b. Occurs. Here, as described above, the cylindrical diameter of the downstream valve columnar portion 42c is configured to be slightly smaller than the diameter of the circle defined by the downstream throttle portion 22b formed on the valve opening member 20, and the downstream valve 42. The downstream valve first tapered portion 42b is formed slightly longer in the valve opening flow path 29 than the downstream first tapered surface 22a of the valve opening member 20.

Therefore, when the downstream opening 22 is in a minute opening state, as shown in FIG. 4, there is a downstream valve cylinder between the downstream throttle portion 22b of the valve opening member 20 and the downstream valve cylinder portion 42c of the downstream valve 42. A narrow gap is generated over the entire circumference of the portion 42c, and this is formed as a narrow flow path. Since this narrow flow path is extremely narrower than the fluid flow path (FIG. 2) formed in the valve port flow path 29 of the valve port member 20, the fluid pressure of the fluid such as drain passing through the narrow flow path is high. Increase.

Then, the fluid such as drain passes through the narrow flow path formed between the downstream throttle portion 22b and the downstream valve columnar portion 42c with the increased fluid pressure, and is ejected with a strong force from the entire circumference of the downstream opening 22. .. As a result, the foreign matter 82 adhering to the downstream end surface 22f and the downstream valve contact surface 42e is peeled off and blown off. The blown foreign matter 82 is discharged from the outlet 13 (FIG. 1) along the direction of the arrow 92 together with the fluid such as drain.

Since the downstream valve columnar portion 42c of the downstream valve 42 has a cylindrical shape having a constant diameter in the axial direction, the distance between the downstream valve columnar portion 42c and the downstream throttle portion 22b is narrow within the axial range of this cylindrical shape. A flow path can be secured. Therefore, when the operating member 40 is slightly moved in the direction of arrow 96, it can be easily and surely adjusted to generate a narrow flow path.

When cleaning the area around the upstream opening 21 of the upstream valve 41 and the valve opening member 20, a tool is fitted into the operation groove 40a (FIG. 1) of the operation bar 48 from the completely closed state shown in FIG. By tightening slightly, the operating member 40 is slightly moved in the direction of arrow 95, and the upstream opening 21 is slightly opened. FIG. 6 is an enlarged view showing a state in which the upstream opening 21 is slightly opened.

By slightly moving the operating member 40 in the direction of arrow 95, a gap is provided between the upstream end surface 21f and the upstream valve contact surface 41e, and between the upstream first tapered surface 21a and the upstream valve first tapered surface 41b. Occurs. Here, as described above, the cylindrical diameter of the upstream valve columnar portion 41c is configured to be slightly smaller than the diameter of the circle defined by the downstream throttle portion 21b formed on the valve port member 20, and the upstream valve 41 The upstream valve first tapered portion 41b is formed slightly longer in the valve opening flow path 29 than the upstream first tapered surface 21a of the valve opening member 20.

Therefore, when the upstream opening 21 is in a minute opening state, as shown in FIG. 6, there is an upstream valve cylinder between the upstream throttle portion 21b of the valve opening member 20 and the upstream valve cylinder portion 41c of the upstream valve 41. A narrow gap is generated over the entire circumference of the portion 41c, and this is formed as a narrow flow path. Since this narrow flow path is extremely narrower than the upstream inner chamber 16 (FIG. 1) through which the fluid passes immediately before, the fluid pressure of the fluid such as drain passing through the narrow flow path increases.

Then, the fluid such as drain passes through the narrow flow path formed between the upstream throttle portion 21b and the upstream valve column portion 41c with the increased fluid pressure, and has a strong force toward the inside of the valve port flow path 29. Squirt. At this time, the foreign matter 82 adhering to the upstream end surface 21f and the upstream valve contact surface 41e is sucked and peeled off by the fluid drawn in with a strong force toward the valve port flow path 29. The peeled foreign matter 82, together with a fluid such as a drain, passes through the valve port flow path 29 and is discharged from the outlet 13 (FIG. 1) along the direction of the arrow 92.

Since the upstream valve columnar portion 41c of the upstream valve 41 has a cylindrical shape having a constant diameter in the axial direction, the distance between the upstream valve columnar portion 41c and the upstream throttle portion 21b is narrow if it is within the axial range of this cylindrical shape. A flow path can be secured. Therefore, when the operating member 40 is slightly moved in the direction of the arrow 95, it can be easily and surely adjusted to generate a narrow flow path.

By the way, as described above, the central portion of the operating member 40 is supported by the casing lid hole 31a, and the support bar 46, which is the tip end portion of the operating member 40, is supported by the supporting space 51 formed in the bottom lid 50. The connecting bar 45 of the operating member 40 is held in the valve port flow path 29 without the central axis deviating from the reference axis 99 (see FIG. 1). Therefore, when the upstream opening 21 or the downstream opening 22 is in a minute opening state, the width of the narrow flow path formed on the entire circumference of the upstream valve cylinder portion 41c or the downstream valve cylinder portion 42c is uniform throughout the entire circumference. It can be assembled so as to form, and it is possible to avoid a bias in the width of the narrow flow path due to the influence of the operation of the bypass valve 1.

[Other Embodiments]
The valve mechanism according to the present application is not limited to the bypass valve 1 shown in the above-described embodiment, and the position is such that the primary valve body does not interfere with the adjustment of the opening degree of the secondary side opening by the secondary valve body. As long as it is arranged and the secondary side valve body is arranged at a position that does not interfere with the adjustment of the opening degree of the primary side opening by the primary side valve body, the valve seat portion, the adjusting portion, the primary side valve body or the secondary side valve body or the secondary side valve body. Other shapes and structures can be applied as the side valve body.

For example, in the above-described embodiment, the downstream valve 42 and the upstream valve 41 are located outside the valve opening member 20, and the downstream valve 42 is used to close the downstream opening 22 of the valve opening member 20 and adjust the opening degree. An example is given in which the upstream valve 41 does not interfere, and conversely, the downstream valve 42 does not interfere with closing the upstream opening 21 of the valve opening member 20 using the upstream valve 41 or adjusting the opening. However, the downstream valve 42 (secondary side valve body) and the upstream valve 41 (primary side valve body) are arranged in the valve opening member 20 (valve seat portion), and the upstream opening 21 or the downstream opening of the valve opening member 20 from the inside. 22 is configured to close or adjust the opening, and the connecting bar 45 is valved so that the other downstream valve 42 or upstream valve 41 does not interfere with the closing or opening adjustment by one of the downstream valve 42 or the upstream valve 41. It can also be formed shorter than the valve port flow path 29 (valve seat flow path) of the mouth member 20.
Further, instead of the connecting bar 45 shown in the above-described embodiment, a connecting portion having a smaller diameter can be applied to secure a wide space for the valve port flow path 29 (valve seat flow path).

20: Valve port member 21: Upstream opening 21b: Upstream throttle 21f: Upstream end face
22: Downstream opening 22b: Downstream throttle 22f: Downstream end face 29: Valve opening space
31a: Casing lid hole 40: Operating member 41: Upstream valve 41a: Upstream flange
41c: Upstream column 42: Downstream valve 42a: Downstream flange 42c: Downstream column
45: Connecting bar 51: Support space

Claims (3)

A valve seat portion having a valve seat flow path that allows the primary side opening and the secondary side opening to communicate with each other, and a valve seat portion that allows fluid flowing in from the primary side opening to flow out to the secondary side opening through the valve seat flow path.
An adjustment unit that is inserted into the valve seat flow path of the valve seat and can be moved according to the adjustment operation.
It is a primary side valve body provided in the adjusting part and located toward the primary side opening of the valve seat part, and moves forward and backward as the adjusting part moves to adjust the opening of the primary side opening. body,
It is a secondary side valve body provided in the adjusting part and located toward the secondary side opening of the valve seat part, and moves forward and backward as the adjusting part moves to adjust the opening of the secondary side opening. Secondary valve body,
Is equipped with
The primary side valve body is arranged at a position that does not interfere with the adjustment of the opening degree of the secondary side opening by the secondary side valve body.
The secondary side valve body is arranged at a position that does not interfere with the adjustment of the opening degree of the primary side opening by the primary side valve body.
A valve mechanism characterized by that. In the valve mechanism according to claim 1,
A primary side support portion provided corresponding to the primary side opening of the valve seat portion, which supports the movement of the adjustment portion.
A secondary support portion provided corresponding to the secondary side opening of the valve seat portion, which supports the movement of the adjustment portion.
A valve mechanism characterized by being equipped with. In the valve mechanism according to claim 1 or 2.
On the peripheral edge of the primary side opening of the valve seat portion, a primary side end surface and a primary side bent portion located from the primary side end surface toward the inside of the valve seat flow path are formed.
The primary side valve body is formed with a primary side closing portion that abuts on the primary side end face and closes the primary side opening, and a primary side approaching portion that protrudes from the primary side closing portion and can enter the inside of the valve seat flow path. Has been
Since the primary side approach portion is formed smaller than the space defined by the primary side bend portion, when the primary side opening is in a predetermined minute opening state, the primary side bend portion and the primary side approach portion A narrow flow path of fluid is formed between them,
A secondary side end face and a secondary side bending portion located from the secondary side end face toward the inside of the valve seat flow path are formed on the peripheral edge of the secondary side opening of the valve seat portion.
The secondary side valve body includes a secondary side closing portion that abuts on the secondary side end face and closes the secondary side opening, and a secondary side that protrudes from the secondary side closing portion and can enter the inside of the valve seat flow path. The next approach is formed,
Since the secondary side approach portion is formed to be smaller than the space defined by the secondary side bending portion, when the secondary opening is in a predetermined minute opening state, the secondary side bending portion and the secondary side A narrow flow path of the fluid is formed between the approach part and
The adjusting portion is a connecting portion located in the valve seat flow path, and is continuous with the primary side approaching portion and the secondary side approaching portion, and has a diameter smaller than that of the primary side approaching portion and the secondary side approaching portion. Has a part,
A valve mechanism characterized by that.

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