JP7122747B2 - Intake/exhaust valve and method for removing foreign matter from intake/exhaust valve - Google Patents

Description

TECHNICAL FIELD The present invention relates to an intake and exhaust valve attached to the top of a standpipe for water supply. The present invention also relates to a foreign matter removal method for removing foreign matter adhering to a valve seat with which a float valve body of an intake/exhaust valve abuts.

2. Description of the Related Art A water supply system of a high-rise building such as a building or an apartment includes a vertical pipe extending vertically, and a water supply pipe branching from the vertical pipe at each floor and extending to each house. An intake and exhaust valve is attached to the top of the standpipe. The intake/exhaust valve releases the air in the standpipe to the outside when the standpipe is filled with water. In addition, if air accumulates in the standpipe after filling with water, the intake/exhaust valve releases the air to the outside, thereby preventing pulsation from occurring in the water supply system. Furthermore, the intake/exhaust valve introduces air into the standpipe from the outside when negative pressure is generated inside the standpipe due to a water outage or the like. As a result, the negative pressure inside the standpipe is eliminated, and the backflow of water from the water supply pipe to the standpipe is prevented.

Such an intake/exhaust valve is described in Patent Document 1. The intake/exhaust valve of the document includes a stand pipe communication port communicating with a stand pipe, an intake/exhaust port, a valve chamber above the stand pipe communication port communicating with the stand pipe communication port, and provided on the ceiling of the valve chamber. a housing having an air intake/exhaust passage connecting the opening and the air intake/exhaust port; The intake and exhaust valve also includes an opening valve seat secured to the housing and surrounding the opening within the valve chamber. Further, the intake/exhaust valve includes a floating valve body that is housed in the valve chamber and moves toward and away from the opening valve seat to open and close the opening, and is housed below the floating valve body in the valve chamber. and a float valve body. The floating valve body includes a valve body that abuts against the valve seat of the opening to block the opening, a valve body flow path that penetrates the valve body in the vertical direction and communicates with the opening, and is fixed to the valve body. a channel valve seat surrounding the lower end opening of the valve body channel. The float valve body has a lower specific gravity than water and can abut against the floating valve body from below. The float valve element moves toward and away from the flow path valve seat as the water level in the valve chamber rises and falls, thereby opening and closing the valve element flow path.

Before the standpipe is filled with water, no water is stored in the valve chamber. Therefore, the float valve body does not float in the valve chamber, and the floating valve body is spaced downward from the opening valve seat. Therefore, during filling, the air in the standpipe is discharged to the outside through the standpipe communication port, the valve chamber, the opening, and the intake and exhaust port. When the water filling is completed, the float valve body moves upward as the water level in the valve chamber rises. The float valve body floats the floating valve body while being in contact with the floating valve body from below. As a result, the floating valve body rises until it comes into contact with the opening valve seat, closing the opening. Also, the float valve element abuts against the flow path valve seat to block the valve element flow path. After that, when air enters and accumulates in the standpipe, air bubbles rise inside the standpipe and reach the valve chamber. When the air bubbles reach the valve chamber, the water level in the valve chamber changes, so that the float valve body tilts and creates a gap between it and the flow path valve seat. As a result, the air that has reached the valve chamber is discharged to the outside through the valve body flow path, the opening, and the intake/exhaust port.

Here, when a negative pressure is generated in the standpipe due to water interruption or the like, the water level in the valve chamber drops, and the float valve element moves downward. Further, as the float valve body moves, the floating valve body moves downward and separates downward from the opening valve seat. As a result, the opening is released, so that external air is sucked from the intake/exhaust port through the opening and introduced into the standpipe through the valve chamber and the standpipe communication port. As a result, the negative pressure in the standpipe is eliminated, so that the backflow of water from the water supply pipe extending from the standpipe to each room into the standpipe can be prevented.

Registered Utility Model No. 3201854

Conventionally, a standpipe of a water supply system of a high-rise building is composed of a plurality of pipes made of metal pipes. However, in recent years, polyethylene pipes, which are more flexible than metal pipes, are sometimes used for standing pipes in consideration of earthquake resistance. Here, if a standpipe is constructed by cutting a polyethylene pipe with a saw blade during construction, cutting chips may remain in the standpipe. Such chips float on water. Therefore, after the standpipe is completely filled with water, the chips reach the valve chamber of the intake/exhaust valve.

Here, if chips that have reached the valve chamber adhere to the flow channel valve seat, the float valve body cannot block the valve body flow channel. When the valve body flow path is not blocked, the water in the standpipe flows out from the standpipe communication port through the valve chamber, the valve body flowpath, the opening, and the intake/exhaust port to the outside. becomes.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an intake/exhaust valve capable of removing foreign matter adhering to a valve seat with which a float valve element abuts. Another object of the present invention is to propose a foreign matter removal method for an intake/exhaust valve for removing foreign matter adhering to a valve seat with which a float valve body abuts.

In order to solve the above problems, the present invention provides an air intake and exhaust port, a stand pipe communication port communicating with a stand pipe, a valve chamber communicating with the stand pipe communication port, and a valve chamber provided on the ceiling of the valve chamber. an opening that communicates with the intake/exhaust port; an opening valve seat that surrounds the opening in the valve chamber; a floating valve body that moves between an opening blocking position and an opening releasing position that is spaced downward from the opening valve seat; and a float valve body housed below the floating valve body in the valve chamber. , wherein the floating valve body includes a valve body portion that abuts against the opening portion valve seat to block the opening portion, and a valve body that penetrates the valve body portion in the vertical direction and communicates with the opening portion. a flow path, a flow path valve seat that is fixed to the valve body and surrounds a lower end opening of the valve body flow path, and a moving member that penetrates the valve body in the vertical direction; is vertically movable between a projecting position projecting downward from the flow path valve seat from the valve body and a retracted position above the flow path valve seat. The float valve body is supported and can contact the flow path valve seat when the moving member is at the retracted position, and can abut the flow path valve seat when the moving member is at the projecting position. It is characterized by being disabled.

According to the present invention, the float valve body can be moved downward away from the flow path valve seat by moving the moving member supported by the floating valve body to the projecting position. Here, the standing pipe is filled with water, the moving member is at the retracted position, the float valve body is in contact with the flow path valve seat to close the valve flow path, and the floating valve body is at the opening blocking position. When the moving member is moved to the protruding position in the pipe blocking state, the moving member contacts the float valve body from above and pushes down the float valve body. As a result, when the float valve body moves downward from the flow path valve seat, the pressure of the water in the standpipe (the pressure of the water in the valve chamber) causes the water to move vigorously between the float valve body and the flow path valve seat. It flows out through the valve body flow path and the opening to the outside from the intake/exhaust port. Therefore, if foreign matter adheres to the flow path valve seat, the foreign matter is washed away from the flow path valve seat when water flows between the float valve element and the flow path valve seat. Foreign matter that has fallen off the flow passage valve seat is discharged outside along with the flow of water. Therefore, it is possible to remove the foreign matter adhering to the flow path valve seat with which the float valve element abuts.

In the present invention, it is preferable that the moving member has an upper abutment portion that abuts the floating valve body from above at the projecting position. In this way, after the moving member is lowered to release the valve body flow path, the moving member can be further lowered to separate the floating valve body downward from the opening valve seat. Here, when the standpipe is blocked, if the floating valve body is moved downward from the opening valve seat by a series of operations that move the moving member downward, the pressure of the water in the standpipe (the pressure of the water in the valve chamber) ), water flows vigorously between the floating valve body and the opening valve seat, and flows out to the outside from the intake/exhaust port through the opening. Therefore, if foreign matter adheres to the opening valve seat, the foreign matter is washed away from the opening valve seat when water flows between the floating valve element and the opening valve seat. Foreign matter that has fallen off the opening valve seat is discharged to the outside along with the flow of water. Therefore, it is possible to remove the foreign matter adhering to the opening valve seat with which the floating valve body abuts. Further, when the moving member is pushed downward, the moving member is arranged at the projecting position, and the valve body flow path is released. Therefore, the floating valve body can be moved with less force than when the floating valve body is moved downward when the float valve body is in contact with the floating valve body and the valve body flow path is blocked. .

In the present invention, a housing comprising the intake/exhaust port, the vertical pipe communication port, the valve chamber, and an intake/exhaust passage connecting the opening and the intake/exhaust port above the valve chamber; an operating member penetrating in the vertical direction through a housing portion above the valve chamber and overlapping the moving member when viewed from the vertical direction, wherein the operating member is in the opening blocking position; a first position spaced upward from the moving member of the body; It can be supported by the housing portion so as to be movable in the vertical direction between a second position to be positioned. With this configuration, the float valve body can be separated from the flow path valve seat by moving the operating member downward from the outside of the housing.

In the present invention, a housing comprising the intake/exhaust port, the vertical pipe communication port, the valve chamber, and an intake/exhaust passage connecting the opening and the intake/exhaust port above the valve chamber; an operating member penetrating in the vertical direction through a housing portion above the valve chamber and overlapping the moving member when viewed from the vertical direction, wherein the operating member is in the opening blocking position; a first position where the body is spaced upward from the moving member; and a third position positioned downward, and supported by the housing portion so as to be movable in the vertical direction. With this configuration, the float valve body can be moved away from the flow path valve seat and the floating valve body can be moved from the opening valve seat by operating the operating member.

In the present invention, the housing portion has a through hole penetrating in the vertical direction, and the operation member includes a shaft portion extending in the vertical direction and penetrating the through hole, and the shaft projecting outside from the housing. a gripping portion attached to an upper end portion of a portion, wherein an inner peripheral surface of the through hole is provided with a female thread, and an outer peripheral surface of the shaft portion is provided with a male thread that engages with the female thread; and the shaft portion can come into contact with the moving member from above. With this configuration, by gripping and rotating the grip portion of the operating member, the operating member can be moved vertically, and the float valve element can be separated from the flow path valve seat.

Next, according to the present invention, in the above method for removing foreign matter from an intake/exhaust valve, the standpipe is filled with water, the moving member is at the retracted position, and the float valve body is in contact with the flow path valve seat. closing the valve body flow path, and moving the moving member to the projecting position to separate the float valve body from the flow path valve seat when the floating valve body is in the opening blocking position. characterized by

Further, according to the present invention, in the above method for removing foreign matter from an intake/exhaust valve, the standpipe is filled with water, the moving member is at the retracted position, and the float valve body is in contact with the flow path valve seat. to close the valve body flow path, and when the floating valve body is in the opening blocking position, the moving member is moved to the projecting position to move the float valve body downward away from the flow path valve seat. Further, the moving member is moved downward to move the floating valve body downward away from the opening valve seat.

According to the present invention, the float valve body can be separated from the flow path valve seat by moving downward the moving member supported by the valve body portion of the floating valve body. As a result, the flow path valve seat can be washed with water using the water pressure in the standpipe. Therefore, it is possible to remove the foreign matter adhering to the flow path valve seat.

It is explanatory drawing of the installation state of an intake/exhaust valve. It is a longitudinal cross-sectional view of an intake/exhaust valve. It is a cross-sectional view of the intake and exhaust valve at the time of completion of filling the standing pipe. FIG. 4 is a cross-sectional view of the intake/exhaust valve during an exhaust operation for releasing the air in the standpipe to the outside. FIG. 4 is an explanatory diagram of a valve seat cleaning operation for cleaning a flow path valve seat; FIG. 4 is an explanatory diagram of a valve seat cleaning operation for cleaning an opening valve seat;

Hereinafter, intake and exhaust valves according to embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory diagram of an installation state of an intake/exhaust valve to which the present invention is applied. FIG. 2 is a longitudinal sectional view of an intake/exhaust valve. FIG. 3 is a cross-sectional view of the intake/exhaust valve at the completion of filling the standpipe with water. FIG. 4 is a cross-sectional view of the intake/exhaust valve during exhaust operation for releasing the air in the standpipe to the outside. 2 to 4, the right half of the operating member is shown in cross section.

The intake/exhaust valve 1 of this example is used in the water supply system 2 of high-rise buildings such as buildings and condominiums. As shown in FIG. 1, a water supply system 2 of a high-rise building includes a standpipe 3 extending in the vertical direction X, and a water supply pipe (not shown) branching from the standpipe 3 on each floor and extending to each house. The standpipe 3 includes a pipe 5 extending in the vertical direction X and a water stop valve 6 connected to the upper end portion of the pipe 5 . A part of the pipe 5 is composed of a polyethylene pipe. An intake/exhaust valve 1 is attached to the top of the standpipe 3 . An intake/exhaust pipe 7 is attached to the intake/exhaust valve 1 . In the following description, the vertical direction X is the direction in which the standpipe 3 extends. Further, the side where the intake/exhaust valve 1 is positioned with respect to the standpipe 3 is defined as an upper side X1, and the opposite side is defined as a lower side X2.

The intake/exhaust valve 1 releases the air in the standpipe 3 to the outside when the standpipe 3 is filled with water. In addition, the intake/exhaust valve 1 releases the air to the outside when air accumulates in the standpipe 3 after filling with water, thereby preventing pulsation from occurring in the water supply system 2. - 特許庁Furthermore, the intake/exhaust valve 1 introduces air into the standpipe 3 from the outside when a negative pressure is generated inside the standpipe 3 due to a water cutoff or the like. As a result, the negative pressure in the standpipe 3 is eliminated, and the backflow of water from the water supply pipe to the standpipe 3 is prevented.

As shown in FIG. 2, the intake/exhaust valve 1 includes a standpipe communication port 11 communicating with the standpipe 3, a valve chamber 12 communicating with the standpipe communication port 11 above the standpipe communication port 11 at X1, and an intake/exhaust pipe 7. , an opening 15 provided in the ceiling 14 of the valve chamber 12 , and an air intake/exhaust passage 16 connecting the opening 15 and the air intake/exhaust port 13 . The intake/exhaust valve 1 also includes an opening valve seat 17 that is fixed to the housing 10 and surrounds the opening 15 within the valve chamber 12 . The opening valve seat 17 is an elastic member made of synthetic rubber or the like.

The housing 10 is composed of a plurality of members. That is, the housing 10 includes a main body member 21 having a vertical pipe communication port 11 at its lower end, an annular bonnet member 22 covering the main body member 21 from above X1, and a lower end portion inserted into a center hole 22a of the bonnet member 22. and an annular member 23 . The housing 10 also includes a cover member 24 that covers the bonnet member 22 from above X1. The cover member 24 has the intake/exhaust port 13 facing sideways. When the cover member 24 is placed over the bonnet member 22 , the housing 10 is provided with an intake/exhaust passage 16 connecting the opening 15 of the valve chamber 12 and the intake/exhaust port 13 between the cover and the bonnet member 22 . Become.

The body member 21 includes a tubular portion 26 having the vertical pipe communication port 11 at its lower end, an annular bottom portion 27 that curves upward X1 from the upper end portion of the tubular portion 26 toward the outer peripheral side, and the annular bottom portion 27 that continues from the outer peripheral end. and an annular body 28 extending upwardly X1. A strainer 29 is arranged on the inner peripheral side of the cylindrical portion 26 . A male screw 30 is provided on the outer peripheral surface of the upper end portion of the annular body portion 28 .

The bonnet member 22 includes an outer cylindrical portion 32 located on the outer peripheral side of the annular body portion 28 of the main body member 21 , an annular plate portion 33 extending inwardly from the upper edge of the cylindrical portion 26 , and a center hole of the annular plate portion 33 . and an inner cylindrical portion 34 extending upward X1 from the annular plate portion 33 on the outer peripheral side of 22a (the center hole of the bonnet member 22). A female thread 35 that is screwed with the male thread 30 of the main body member 21 is provided on the inner peripheral surface of the outer tubular portion 32 . The center hole 22a of the annular plate portion 33 is circular. A female screw 34a is provided on the upper portion of the inner peripheral surface of the inner tubular portion 34 .

The annular member 23 includes a lower tubular portion 38 inserted into the center hole 22a of the annular plate portion 33, an annular plate portion 39 extending outward from the upper end edge of the lower tubular portion 38, and an outer peripheral edge of the plate portion 39. and an annular projecting portion 41 projecting from the upper end edge of the upper cylindrical portion 40 to the outer peripheral side. A male screw 40 a is provided on the outer peripheral surface of the upper cylindrical portion 40 . The male thread 40 a of the upper tubular portion 40 is screwed with the female thread 34 a of the inner tubular portion 34 of the bonnet member 22 .

The opening valve seat 17 is sandwiched between the bonnet member 22 and the annular member 23 and fixed to the housing 10 . That is, the opening valve seat 17 includes an annular valve seat portion 43 positioned between the inner peripheral side end face of the annular plate portion 33 of the bonnet member 22 and the lower cylinder portion 38 of the annular member 23, and a valve seat portion and a flange portion 44 extending from the upper end edge of the bonnet member 22 to the outer peripheral side and positioned between the annular plate portion 33 of the bonnet member 22 and the plate portion 39 of the annular member 23 .

Here, the space surrounded by the body member 21 , the bonnet member 22 , the annular member 23 and the opening valve seat 17 is the valve chamber 12 . The ceiling 14 of the valve chamber 12 is composed of the annular plate portion 33 of the bonnet member 22 , the valve seat portion 43 of the opening valve seat 17 , and the lower tubular portion 38 of the annular member 23 . The opening 15 provided in the ceiling 14 of the valve chamber 12 is defined by the inner wall surface of the lower tubular portion 38 of the annular member 23 . The orifice valve seat 17 has a valve seat portion 43 surrounding the orifice 15 within the valve chamber 12 . The standpipe communication port 11, the valve chamber 12, and the opening 15 are coaxial. That is, the central axis L of the valve chest 12 passes through the center of the vertical pipe communication port 11 and the opening 15 .

A bucket 46 , a floating valve body 47 and a float valve body 48 are accommodated in the valve chamber 12 . The bucket 46 is made of resin, and is made of polyacetal in this example. The bucket 46 includes a bottom portion 50 having a circular contour, a cylindrical portion 51 extending upward from the outer peripheral edge of the bottom portion 50 toward X1, and an annular projection 52 projecting from the upper end portion of the cylindrical portion 51 to the outer peripheral side. The bottom portion 50 includes a central portion, an annular portion surrounding the central portion, and a plurality of ribs extending radially from the central portion and connected to the annular portion. Therefore, the bottom portion 50 is open between the ribs in the circumferential direction. The bucket 46 is fixed to the housing 10 with the projecting portion 52 sandwiched between the annular body portion 28 of the main body member 21 and the annular plate portion 33 of the bonnet member 22 in the vertical direction X. As shown in FIG. With the bucket 46 fixed to the housing 10 , the bottom 50 of the bucket 46 is spaced upward X<b>1 from the annular bottom 27 of the body member 21 .

The floating valve body 47 and the float valve body 48 are housed inside the bucket 46 . The floating valve body 47 is made of resin such as polypropylene. In the valve chamber 12, the floating valve body 47 is separated from the opening valve seat 17 in an opening closing position 47A (see FIG. 3) where the opening 15 is closed by coming into contact with the opening valve seat 17 and downward X2. It moves between opening release positions 47B. In FIG. 2, the floating valve body 47 is positioned at the opening release position 47B.

The floating valve body 47 includes a circular valve body portion 54 that abuts against the opening valve seat 17 to close the opening portion 15, and a skirt portion 55 that extends downward X2 from the outer peripheral portion of the valve body portion 54. As shown in FIG. The floating valve body 47 includes a valve body flow path 56 that penetrates the valve body 54 in the vertical direction X and communicates with the opening 15 , and a lower end opening 15 of the valve body flow path 56 fixed to the valve body 54 . A flow path valve seat 57 surrounds the . Further, the floating valve body 47 has a moving member 58 that passes through the valve body portion 54 in the vertical direction X and is supported by the valve body portion 54 so as to be movable in the vertical direction X. As shown in FIG. The valve body flow path 56 linearly extends in the up-down direction X at a position spaced apart from the center of the valve body portion 54 toward the outer peripheral side. The flow path valve seat 57 is an elastic member made of synthetic rubber or the like. The flow path valve seat 57 protrudes downward X<b>2 from the lower surface of the valve body portion 54 .

The moving member 58 is made of resin such as polypropylene, and has a lower specific gravity than water. The moving member 58 penetrates through the central portion of the valve body portion 54 . That is, the valve body portion 54 has a circular through hole 60 penetrating in the up-down direction X at its central portion. The moving member 58 includes a cylindrical portion 61 passing through the through hole 60, an upper contact portion 62 projecting outward from the upper end portion of the cylindrical portion 61, and a lower contact portion projecting outward from the lower end portion of the cylindrical portion 61. and a contact portion 63 . Further, the valve body portion 54 has an annular groove 64 on the outer peripheral surface of the cylindrical portion 61 . An O-ring 65 is attached to the annular groove 64 . The O-ring 65 is interposed between the moving member 58 and the valve body portion 54 .

Here, the moving member 58 has a protruding position 58A (see FIG. 5) protruding from the valve body 54 downward X2 from the flow path valve seat 57 and a retracted position 58B above the flow path valve seat 57 X1. move between At the projecting position 58A, the upper contact portion 62 contacts the valve body portion 54 from above X1. At the retracted position 58B, the lower contact portion 63 contacts the valve body portion 54 from below X2. In the state shown in FIG. 2, the moving member 58 is at the retracted position 58B.

The floating valve body 47 also includes a headed screw 67 attached to the valve body 54 from below. The headed screw 67 is made of resin, and the head portion of the headed screw 67 protrudes downward from the valve main body 54 in the direction X2. The headed screw 67 is a spacer interposed between the lower surface of the valve body 54 and the float valve element 48 .

The float valve body 48 is arranged below the floating valve body 47 X2. Also, the float valve body 48 is positioned inside the skirt portion 55 of the floating valve body 47 . The float valve body 48 has a truncated cone shape as a whole, and the outer diameter dimension increases toward the upper side X1. The float valve body 48 has a lower specific gravity than water. The float valve body 48 moves in the vertical direction X as the water level in the valve chamber 12 rises and falls.

The float valve body 48 can contact the floating valve body 47 from below X2. Further, when the moving member 58 is at the retracted position 58B, the float valve body 48 can abut against the flow channel valve seat 57 of the floating valve body 47 from below X2 to block the valve body flow channel 56. be.

Here, the intake/exhaust valve 1 has an operating member 71 for moving the moving member 58 . The operation member 71 penetrates in the vertical direction X through a housing portion 10a which is located above the valve chamber 12 in the housing 10 and overlaps the opening 15 when viewed in the vertical direction X. As shown in FIG. Further, the operating member 71 is supported by the housing portion 10a so as to be movable in the vertical direction X. As shown in FIG. In this example, the housing portion 10a that supports the operation member 71 is a portion of the cover member 24 that overlaps the opening 15 when viewed in the vertical direction X. As shown in FIG.

The housing portion 10a is provided with a through hole 72 penetrating in the vertical direction X. As shown in FIG. A female thread 73 is provided on the inner peripheral surface of the through hole 72 . On the other hand, the operation member 71 includes a shaft portion 75 extending in the vertical direction X and passing through the through hole 72, and a grip portion 76 attached to the upper end portion of the shaft portion 75 projecting outside from the housing portion 10a. An outer peripheral surface of the shaft portion 75 is provided with a male thread 75a that is screwed with the female thread 73 of the housing portion 10a. Therefore, the operation member 71 moves in the vertical direction X by gripping the grip portion 76 and rotating the operation member 71 .

The operating member 71 is normally arranged at an upper end position 71A (first position) spaced upward X1 from the floating valve body 47 at the opening blocking position 47A. The operating member 71 is operated to move downward X2 during a valve seat cleaning operation, which will be described later. When the operating member 71 moves downward X2, the shaft portion 75 contacts the moving member 58 from above X1.

(Suction and exhaust operation)
Next, the intake/exhaust operation of the intake/exhaust valve 1 will be described with reference to FIGS. During the construction of the water supply system 2, water is not stored in the valve chamber 12 before the standpipe 3 is filled with water. Therefore, as shown in FIG. 2, the floating valve body 47 and the float valve body 48 rest on the bottom 50 of the bucket 46 by their own weight. In this state, the floating valve body 47 is in the opening release position 47B, which is separated from the opening valve seat 17 downward X2. Also, in this state, the floating valve body 47 and the float valve body 48 overlap each other. Therefore, the float valve body 48 abuts against the channel valve seat 57 to block the valve body channel 56 . Therefore, when the water rises in the standpipe 3 during filling, the air inside the standpipe 3 is discharged to the outside through the standpipe communication port 11, the valve chamber 12, the opening 15, and the intake/exhaust port 13. be done.

When the standpipe 3 is completely filled with water, the float valve element 48 moves upward X1 as the water level in the valve chamber 12 rises, as shown in FIG. Further, the float valve body 48 floats the floating valve body 47 while being in contact with the floating valve body 47 from below X2. After that, when the water level W in the valve chamber 12 reaches a predetermined water level W, the floating valve body 47 comes into contact with the opening valve seat 17 to close the opening 15 . That is, the floating valve body 47 is at the opening blocking position 47A. Also, the float valve element 48 abuts against the flow path valve seat 57 to block the valve element flow path 56 . That is, the float valve body 48 is in the valve body flow path closed position 48A. Here, as shown in FIG. 2, the state in which the moving member 58 is at the retracted position 58B, the floating valve body 47 is at the opening blocking position 47A, and the float valve body 48 is at the valve body channel closing position 48A is as follows: The standpipe is blocked.

After that, when air enters and accumulates in the standpipe 3, air bubbles rise inside the standpipe 3 and reach the valve chamber 12.例文帳に追加Then, as indicated by the dashed arrow in FIG. 4, when the bubble O1 reaches the valve chamber 12, the water level W in the valve chamber 12 drops. Therefore, the float valve body 48 is inclined to form a clearance with the flow passage valve seat 57 . As a result, the air O2 in the valve chamber 12 is discharged to the outside through the valve body flow path 56, the opening 15, and the intake/exhaust port 13, as indicated by the arrows in FIG. Further, when the air O2 is discharged to the outside, the water level W in the valve chamber 12 returns, so that the float valve element 48 rises and abuts the flow path valve seat 57 as shown in FIG. This closes the valve body flow path 56 . By repeating the above operation, the intake and exhaust valve 1 automatically discharges air, which causes pulsation and corrosion, from the inside of the standpipe 3 .

Here, when the water supply pressure drops due to a water outage or the like, the water level W drops and a negative pressure is generated inside the standpipe 3 . In this case, the float valve element 48 descends as the water level W decreases, and the floating valve element 47 descends due to the suction force of the negative pressure. As a result, as shown in FIG. 2, the floating valve body 47 and the float valve body 48 are placed on top of each other on the bottom portion 50 of the bucket 46 . As a result, the floating valve body 47 is placed at the opening release position 47B, and the opening 15 is released. Therefore, external air is sucked from the intake/exhaust port 13 of the intake/exhaust valve 1, and the opening 15
, the valve chamber 12 and the standpipe communication port 11 into the standpipe 3 . As a result, the negative pressure in the standpipe 3 is eliminated, so that the backflow of water from the water supply pipe extending from the standpipe 3 to each room into the standpipe 3 can be prevented.

(Valve seat cleaning operation)
Next, referring to FIGS. 3, 5, and 6, the valve seat cleaning operation for cleaning the flow path valve seat 57 and the opening valve seat 17 using the water in the standpipe 3 will be described. FIG. 5 is an explanatory view of the valve seat cleaning operation for cleaning the flow path valve seat 57. FIG. FIG. 6 is an explanatory view of the valve seat cleaning operation for cleaning the opening valve seat 17. As shown in FIG. 5 and 6 show a cross section of the right half of the operation member.

When the standpipe 3 is constructed by cutting a polyethylene pipe with a saw blade during construction of the water supply system 2 , chips from cutting may remain in the standpipe 3 . Such chips float on water. Therefore, the chips reach the valve chamber 12 of the intake/exhaust valve 1 after the standpipe 3 is completely filled with water.

Here, if chips that have reached the valve chamber 12 adhere to the flow channel valve seat 57, the float valve body 48 cannot block the valve body flow channel 56 in the standing pipe sealed state shown in FIG. When the valve body flow path 56 is not blocked, the water in the standpipe 3 flows from the valve chamber 12 through the valve body flow path 56, the opening 15, and the air intake/exhaust passage 16, and then from the intake/exhaust port 13 to the outside. It will be in a state of flowing out. Further, when the chips that have reached the valve chamber 12 adhere to the opening valve seat 17 , the opening 15 cannot be closed by the floating valve element 47 . If the opening 15 is not blocked, the water in the standpipe 3 flows out from the valve chamber 12 through the opening 15 and the air intake/exhaust passage 16 to the outside through the air intake/exhaust port 13 . In order to avoid or restore such a state, the following valve seat cleaning operation is performed.

The valve seat cleaning operation is performed when the intake/exhaust valve 1 is in the vertical pipe blockage state. That is, at the time when the valve seat cleaning operation is started, the standing pipe 3 is completely filled with water, the moving member 58 supported by the floating valve body 47 is at the retracted position 58B, and the float valve body 48 is in the flow path. It is in the valve body channel closing position 48A where it abuts against the valve seat 57 to close the valve body channel 56, and the floating valve body 47 is in the opening blocking position 47A. In the standpipe closed state, even though the float valve body 48 is arranged at the valve body flow path closed position 48A, foreign matter such as cutting chips adhere to the flow path valve seat 57 and the float valve body This includes the case where a slight gap is formed between 48 and flow path valve seat 57 . Also, in the standpipe blocking state, even though the floating valve body 47 is arranged at the opening blocking position 47A, foreign matter such as chips adhere to the opening valve seat 17 and the floating valve body 47 This includes the case where a slight gap is formed between the opening valve seat 17 and the opening valve seat 17 .

In the valve seat cleaning operation, the operating member 71 is lowered from the upper end position 71A. Here, when the operating member 71 is moved from the upper end position 71A (see FIG. 3) of its movable range to the lower end position 71B (third position, see FIG. 6), the operating member 71 moves to the lower end of its movable range. Before reaching the position 71B, the operating member 71 contacts the moving member 58 from above X1. Then, as shown in FIG. 5, the operating member 71 moves the moving member 58 from the retracted position 58B to the projecting position 58A. When the moving member 58 moves to the projecting position 58A, the moving member 58 contacts the float valve body 48 from above X1 and pushes the float valve body 48 downward X2.

Here, when the float valve body 48 is separated from the flow passage valve seat 57 downward X2, the pressure of the water in the standpipe 3 (the pressure of the water in the valve chamber 12) causes the water S1 flows vigorously between the float valve body 48 and the flow path valve seat 57, and flows out of the intake/exhaust port 13 via the valve body flow path 56, the opening 15, and the intake/exhaust path 16. Therefore, if foreign matter adheres to the flow path valve seat 57 , the foreign matter is washed away from the flow path valve seat 57 when water flows between the float valve body 48 and the flow path valve seat 57 . Foreign matter that has fallen off the flow path valve seat 57 is discharged to the outside along with the flow of the water S1. Therefore, it is possible to remove the foreign matter adhering to the flow path valve seat 57 with which the float valve body 48 abuts.

After that, as shown in FIG. 6, the operating member 71 is made to reach the lower end position 71B of its movable range. When the operating member 71 reaches the lower end position 71B, the moving member 58 is further pushed downward X2. Here, when the moving member 58 is arranged at the projecting position 58A, the upper contact portion 62 of the moving member 58 contacts the valve body portion 54 from above X1. Therefore, when the moving member 58 is further pushed downward X2 by the operating member 71, the floating valve element 47 is separated from the opening valve seat 17 downward X2 as the moving member 58 descends. Therefore, the lower end position 71B of the movement range of the operation member 71 is a position where the floating valve body 47 is positioned downward X2 from the opening blocking position 47A by coming into contact with the movement member 58 at the projecting position 58A from above.

Here, when the moving member 58 is moved downward X2 by the operation member 71 to separate the floating valve body 47 from the opening valve seat 17 downward X2 in the standpipe blocked state, the water in the standpipe 3 is Due to the pressure (the pressure of the water in the valve chamber 12), the water S2 flows vigorously between the floating valve element 47 and the opening valve seat 17, and flows through the opening 15 and the internal flow path to the intake/exhaust port 13. flows out from Therefore, if foreign matter adheres to the opening valve seat 17, the foreign matter is washed away from the opening valve seat 17 when the foreign matter water flows between the floating valve element 47 and the opening valve seat 17. . Foreign matter that has fallen off the opening valve seat 17 is discharged to the outside along with the flow of the water S2. Therefore, the foreign matter attached to the opening valve seat 17 against which the floating valve element 47 abuts can be removed.

When the moving member 58 is further pushed downward X2 after cleaning the flow path valve seat 57, the moving member 58 is positioned at the projecting position 58A, and the valve body flow path 56 is released. Therefore, compared to moving the floating valve body 47 downward X2 when the float valve body 48 is in contact with the floating valve body 47 and the valve body flow path 56 is blocked, the floating valve body 47 is moved with less force. can be moved downward by X2.

Here, if the operating member 71 is returned from the lower end position 71B to the upper end position 71A after the valve seat cleaning operation is performed, the float valve body 48, the moving member 58, and the floating valve body 47 move as the operating member 71 rises. to rise. Then, the intake/exhaust valve 1 returns to the standpipe blocking state shown in FIG.

(Effect)
In this example, the float valve element 48 can be separated from the flow path valve seat 57 by moving the moving member 58 downward X2 when the standpipe is blocked. As a result, the flow path valve seat 57 can be washed with water using the water pressure in the standpipe 3 . Therefore, the foreign matter adhering to the flow path valve seat 57 can be removed.

Further, if the opening 15 is released by a series of operations that lower the moving member 58 after releasing the valve body flow path 56, the water pressure in the standpipe 3 is used to wash the opening valve seat 17 with water. can. Therefore, the foreign matter adhering to the opening valve seat 17 can be removed.

Here, in this example, since the operation member 71 is provided, the flow passage valve seat 57 and the opening valve seat 17 are cleaned by moving the operation member 71 downward X2 from the outside of the housing 10. be able to.

Further, in this example, the moving member 58 has a specific gravity smaller than that of water. Therefore, when the operating member 71 is returned to the upper end position 71A, it is easy to return the moving member 58 to the retracted position 58B.

When the operating member 71 is moved from the upper end position 71A of its movable range to the lower end position (second position) in the standpipe blocking state, the operating member 71 contacts the moving member 58 from above X1. The moving member 58 may be moved to the projecting position 58A. That is, the lower end position of the movement range of the operating member 71 is positioned below the upper end position 71A and contacts the moving member 58 of the floating valve body 47 at the opening blocking position 47A to position the moving member 58 at the projecting position 58A. Position to let and may. In this case, the intake/exhaust valve 1 can only clean the flow path valve seat 57 by operating the operating member 71 .

DESCRIPTION OF SYMBOLS 1... Intake/exhaust valve, 2... Water supply system, 3... Standpipe, 5... Piping, 6... Water stop valve, 7... Intake/exhaust pipe, 10... Housing, 10a... Housing part, 11... Standpipe communication port, 12... Valve Chamber 13 Air intake/exhaust port 14 Ceiling 15 Opening 16 Air intake/exhaust passage 17 Opening valve seat 21 Body member 22 Bonnet member 22a Center hole 23 Annular member DESCRIPTION OF SYMBOLS 24... Cover member 26... Cylindrical part 27... Annular bottom part 28... Annular trunk part 29... Strainer 30... Male screw 32... Outer cylinder part 33... Annular plate part 34... Inner cylinder part 38... Lower cylinder part 39 Plate part 40 Upper cylinder part 41 Projection part 43 Valve seat part 44 Flange part 46 Bucket 47 Floating valve body 47A Floating valve body opening Blocking position 47B... Floating valve body opening release position 48... Float valve body 48A... Valve body flow path closing position 50... Bottom part 51... Cylindrical part 52... Protruding part 54... Valve body part 55 ... Skirt portion 56 ... Valve body flow path 57 ... Flow path valve seat 58 ... Moving member 58A ... Protruding position of moving member 58B ... Retreat position of moving member 60 ... Through hole 61 ... Cylindrical portion 62 Upper contact portion 63 Lower contact portion 64 Annular groove 65 O-ring 67 Headed screw 71 Operating member 71A Upper end position of operating member 71B Lower end position of operating member , 72... Through hole 75... Shaft part 76... Grip part L... Axis line O1, O2... Air in valve chamber S1, S2... Water W... Water level X... Vertical direction

Claims (7)

an air intake and exhaust port;
a standpipe communication port communicating with the standpipe;
a valve chamber communicating with the vertical pipe communication port;
an opening provided in the ceiling of the valve chamber and communicating with the intake/exhaust port;
an opening valve seat surrounding the opening within the valve chamber;
It is accommodated in the valve chamber and moves between an opening blocking position where it abuts against the opening valve seat from below to block the opening and an opening releasing position where it is separated downward from the opening valve seat. a floating valve body;
a float valve body accommodated below the floating valve body in the valve chamber; a valve body flow path penetrating the main body in the vertical direction and communicating with the opening; a flow path valve seat fixed to the valve body and surrounding a lower end opening of the valve body flow path; and the valve body and a moving member penetrating in the vertical direction,
The moving member is configured to move the valve vertically between a projecting position projecting downward from the flow path valve seat from the valve main body and a retracted position above the flow path valve seat. supported by the main body,
The float valve body can contact the flow path valve seat when the moving member is at the retracted position, and cannot abut the flow path valve seat when the moving member is at the projecting position. An intake and exhaust valve characterized by: 2. The intake/exhaust valve according to claim 1, wherein the moving member has an upper abutting portion that abuts against the floating valve body from above at the projecting position. a housing comprising the intake/exhaust port, the vertical pipe communication port, the valve chamber, and an intake/exhaust passage connecting the opening and the intake/exhaust port above the valve chamber;
an operating member that penetrates in the vertical direction through a portion of the housing above the valve chamber and overlaps the moving member when viewed from the vertical direction;
The operating member has a first position spaced upward from the moving member of the floating valve body in the opening blocking position, and a first position in which the floating valve body is in the opening blocking position below the first position. and a second position in which the moving member is brought into contact with the moving member to position the moving member at the projecting position, and the moving member is supported by the housing portion so as to be movable in the vertical direction. 2. The intake/exhaust valve according to 2. a housing comprising the intake/exhaust port, the vertical pipe communication port, the valve chamber, and an intake/exhaust passage connecting the opening and the intake/exhaust port above the valve chamber;
an operating member that penetrates in the vertical direction through a portion of the housing above the valve chamber and overlaps the moving member when viewed from the vertical direction;
The operating member has a first position where it is separated upward from the moving member of the floating valve body at the opening blocking position, and a lower position than the first position where the moving member is at the projecting position. and a third position where the floating valve body is positioned below the opening closing position by abutting thereon, and supported by the housing portion so as to be movable in the vertical direction. Item 3. The intake/exhaust valve according to item 2. The housing portion has a through hole penetrating in the vertical direction,
The operation member includes a shaft portion extending in the vertical direction and penetrating the through hole, and a grip portion attached to an upper end portion of the shaft portion projecting outside from the housing,
A female thread is provided on the inner peripheral surface of the through hole,
An outer peripheral surface of the shaft portion is provided with a male thread that is screwed with the female thread,
5. The intake/exhaust valve according to claim 3, wherein the shaft portion can contact the moving member from above. 3. In the method for removing foreign matter from intake and exhaust valves according to claim 1,
The standpipe is filled with water, the moving member is at the retracted position, the float valve body contacts the flow path valve seat to close the valve flow path, and the floating valve body is the opening. A foreign matter removing method, wherein the moving member is moved to the projecting position to separate the float valve body from the flow path valve seat when the valve is in the blocking position. In the foreign matter removal method for intake and exhaust valves according to claim 2,
The standpipe is filled with water, the moving member is at the retracted position, the float valve body contacts the flow path valve seat to close the valve flow path, and the floating valve body is the opening. moving the moving member to the protruded position to move the float valve body downward away from the flow path valve seat when the valve is in the blocking position;
Further, the foreign matter removing method is characterized in that the moving member is moved downward to move the floating valve body downward away from the opening valve seat.

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