JP4996356B2 - Closure mechanism for pivotally mounted on-off valve, and deodorizer for sewer pipes having the closure mechanism - Google Patents

Description

The present invention relates to a closing mechanism for a pivoting on / off valve that opens and closes a valve body around a pivoting shaft such as a pin and a hinge, and more specifically, a closing mechanism for assisting the closing operation of the valve body of the pivoting on / off valve. About. More particularly, the present invention relates to a closing mechanism suitable for being applied to a pivoted on / off valve of a deodorizing device in a pipe culvert such as a rainwater / sewage tub in a sewer tractor.
In particular, the present invention relates to a deodorizer for sewer pipes provided with the blocking mechanism.

In general, a closing mechanism for a pivoting on / off valve is configured such that a valve body pivotally attached to a pivot shaft such as a pin or a hinge is brought into contact with or separated from a valve seat around the valve opening, and the valve body is opened and closed to The arrangement is intermittent, allowing passage of fluid in only one direction from the upstream side to the downstream side, and is normally closed. Thereby, the backflow of the fluid from the downstream side and its atmospheric gas is prevented (refer to patent documents 1 to 6).
In such a pivot-type on-off valve, the valve body is closed by its own weight, and depending on its mounting posture, it is in a half-open state and has the disadvantage that it cannot perform its intended action. In addition, since the closing force (contact force against the valve seat) of the valve body depends on the weight of the valve body even in a normal mounting posture, if the valve body is light, rattling is likely to occur and the valve body is heavy. In some cases, it can be pointed out that the fluid is not discharged.
Thus, the adjustment of the closing force of the valve body is extremely difficult depending on the weight of the valve body.
Japanese Utility Model Publication No. 61-84786 Japanese Utility Model Publication No. 61-180283 Japanese Utility Model Publication No. 61-23105 Japanese Utility Model Publication No. 61-41823 JP-A-11-13121 Japanese Patent Laid-Open No. 11-50519

The present invention has been made in view of the above circumstances, and in this type of pivoted on-off valve, the valve body can be reliably closed without being influenced by the mounting posture, and the closing force of the valve body can be reduced. It is an object to obtain a closing mechanism that can be easily adjusted.
For this reason, the present invention achieves this object by developing auxiliary means that can be easily placed on the valve body.
Another object of the present invention is to improve the conventional deodorization device for sewer pipes by applying an on-off valve having such auxiliary means.

A first aspect of the present invention relates to a closing mechanism for a pivoted on-off valve (hereinafter referred to as “first invention”),
A pivoting on-off valve that opens and closes the valve body by pivotally attaching the valve body with a pivot shaft such as a pin or hinge, and bringing the valve body of the valve body into contact with or away from the valve seat around the valve opening. In
With a material having elasticity, it forms a plate shape, and a valve closing biasing means consisting of an integral spring part and mounting base part is used,
A spring portion of the valve closing biasing means has an arc shape and is disposed across the pivot shaft,
The mounting base is fixed to the valve seat side;
The spring portion has elasticity, and the tip of the spring portion is elastically contacted to the valve body side.
It is characterized by that.
In the above configuration,
1) The material for the valve closing urging means is selected from polypropylene resin, polyvinyl chloride resin and ABS resin,
2) The valve closing urging means is fixed by bolts and nuts via the mounting base, and a gripping recess for the nut is formed on the surface side of the mounting base.
Is a technical matter that is adopted as appropriate.

(Function)
The valve body rotates around the pivot shaft, and normally receives the urging force of the valve closing urging means and is brought into contact with the valve seat to take a closing operation.
When the fluid acts in the opening direction of the valve body, the fluid opens the valve body against the biasing force acting on the valve body and passes through the valve port.

The second aspect of the present invention also relates to a closing mechanism for a pivoted on-off valve (hereinafter referred to as “second invention”).
A pivoting on-off valve that opens and closes the valve body by pivotally attaching the valve body with a pivot shaft such as a pin or hinge, and bringing the valve body of the valve body into contact with or away from the valve seat around the valve opening. In
With a material having elasticity, it forms a plate shape, and a valve closing biasing means consisting of an integral spring part and mounting base part is used,
A spring portion of the valve closing biasing means has an arc shape and is disposed across the pivot shaft,
The mounting base is fixed to the valve seat side;
The spring part has elasticity, and the tip of the spring part is arranged with a clearance with the valve body side,
It is characterized by that.
1) The material for the valve closing urging means is selected from polypropylene resin, polyvinyl chloride resin and ABS resin,
2) The valve closing urging means is fixed by bolts and nuts via the mounting base, and a gripping recess for the nut is formed on the surface side of the mounting base.
Is a technical matter that is adopted as appropriate.

(Function)
The valve body rotates around the pivot shaft and is normally brought into contact with the valve seat by its own weight and takes a closing operation.
When the fluid acts in the opening direction of the valve body, it operates lightly at the beginning of the valve opening according to the clearance distance of the valve body, and after the valve body comes into contact with the spring portion of the valve closing biasing means, a constant pressure is applied. A stable opening operation is performed under the influence of power.
By having a play, a small amount of fluid is discharged, and the fluid does not accumulate in the lower part of the valve body.

The combination aspect of the first invention and the second invention constitutes the closing mechanism for the pivoted on-off valve of the third invention.
A pivoting on-off valve that opens and closes the valve body by pivotally attaching the valve body with a pivot shaft such as a pin or hinge, and bringing the valve body of the valve body into contact with or away from the valve seat around the valve opening. In
A plurality of valve closing urging means comprising a spring part and a mounting base part are used in a symmetrical manner,
Each of the valve closing urging means is disposed across the pivot shaft,
In the first valve closing biasing means, the mounting base is fixed to the valve seat side, the spring part has elasticity, and the tip of the spring part is elastically contacted to the valve body side,
In the second valve closing biasing means, the mounting base is fixed to the valve seat side, the spring part has elasticity, and the tip of the spring part is arranged with a clearance from the valve body side,
It is characterized by that.
In the above configuration,
1) The material for the valve closing urging means is selected from polypropylene resin, polyvinyl chloride resin and ABS resin,
2) The valve closing urging means is fixed by bolts and nuts via the mounting base, and a gripping recess for the nut is formed on the surface side of the mounting base.
Is a technical matter that is adopted as appropriate.

(Function)
The valve body rotates around the pivot shaft, and normally receives the urging force of the first valve closing urging means and is brought into contact with the valve seat to take a closing operation.
When the fluid acts in the opening direction of the valve body, the valve opening in the initial stage of valve opening associated with the clearance distance of the valve body is opened by receiving a constant light biasing force, and the valve body is a spring of the second valve closing biasing means. After coming into contact with the part, it receives a further urging force to perform a stable opening operation.
The valve body can be opened in stages by the first and second valve closing urging means.

4th of this invention is related with the deodorization apparatus for sewer pipes (4th invention), As described in Claim 5,
A deodorizing device disposed on a mounting pipe connected to a drain of a sewer pipe dredging pipe,
An engaging means arranged to engage with a drain outlet of the sewer pipe culvert; and a main body portion provided continuously with the engaging means and disposed in the attachment pipe.
The main body is
A. A cylindrical body having a small outer diameter for holding a predetermined gap than the inner diameter of the mounting pipe, and forming a base;
A. A partition wall that is transversely closed at a predetermined angle in the cylindrical body, and an opening is formed downward in the central portion;
C. The main valve body that can be opened and closed freely, which closes the opening of the partition wall and opens only in the flowing-down direction by rotating around the pivot axis,
D. With a material having elasticity, it has a plate shape, and is composed of a spring part and a mounting base part, and the spring part has an arc shape and is arranged across the pivot shaft of the main valve body, A valve closing biasing means in which a mounting base is fixed to the partition wall side, and the spring portion is elastically contacted to a valve body side that performs an opening and closing operation;
Consists of
The engaging means includes an arm portion that extends from both side surfaces of the rear end of the main body portion while maintaining the same curvature as the main body portion, and a latch that protrudes laterally from the end portion of the arm portion. Consisting of a tube,
It is characterized by that.

(Function)
The main valve body of the sewage pipe deodorization device always maintains the valve closing operation by the valve closing urging means. Thus, the desired action is maintained regardless of the mounting posture of the sewer pipe deodorizer.

The fifth aspect of the present invention relates to a deodorizer for sewer pipes (the fifth aspect),
A deodorizing device disposed on a mounting pipe connected to a drain of a sewer pipe dredging pipe,
An engaging means arranged to engage with a drain outlet of the sewer pipe culvert; and a main body portion provided continuously with the engaging means and disposed in the attachment pipe.
The main body is
A. A cylindrical body having a small outer diameter for holding a predetermined gap than the inner diameter of the mounting pipe, and forming a base;
A. A partition wall that is transversely closed at a predetermined angle in the cylindrical body, and an opening is formed downward in the central portion;
C. The main valve body that can be opened and closed freely, which closes the opening of the partition wall and opens only in the flowing-down direction by rotating around the pivot axis,
D. A sub-valve body that can be opened and closed freely, closing the opening established in the main valve body, and rotating only around the pivot axis and opening in the direction opposite to the flowing-down direction of running water,
E. It has an elastic material, has a plate shape, and is integrally formed with a spring portion and a mounting base portion. The spring portion has an arc shape and straddles the pivot shaft of the main valve body and the subvalve body. A valve closing urging means, wherein the mounting base is fixed to the partition wall side, and the spring portion is elastically contacted with the valve body side that opens and closes;
Consists of
The engaging means includes an arm portion that extends from both side surfaces of the rear end of the main body portion while maintaining the same curvature as the main body portion, and a latch that protrudes laterally from the end portion of the arm portion. Consisting of a tube,
It is characterized by that.

(Function)
The main valve body and the sub-valve body of the sewerage pipe deodorization device always maintain the valve closing operation by the valve closing urging means. Thus, the desired action is maintained regardless of the mounting posture of the sewer pipe deodorizer.

The sixth aspect of the present invention relates to an odor prevention apparatus for sewer pipes (sixth aspect), and as described in claim 8,
In a sewage odor prevention apparatus comprising a water collecting cylinder portion in which a water collecting port is formed above and a drain port is formed on the side,
While having a valve seat that forms the same plane around the drainage port of the drainage cylinder part, a plurality of first mounting holes are opened side by side in the drainage cylinder part above the drainage port,
A band plate having a second mounting hole corresponding to the first mounting hole is fixed with a fixture interposed between the first mounting hole and the second mounting hole at the upper part of the drainage port of the water collecting cylinder portion. And
A non-deformable on-off valve body having a flat valve portion covering the valve seat via a pivot shaft is attached to the band plate,
In addition, it has an elastic material, has a plate shape, and is integrally formed with a spring portion and a mounting base, and the spring portion has an arc shape and is disposed across the pivot shaft of the on-off valve body. The mounting base is fixed to the upper side of the pivot shaft, and the valve closing biasing means is arranged in which the spring part is elastically contacted to the flat valve part side that opens and closes.
It is characterized by that.

(Function)
The on-off valve body of the sewage pipe deodorization device always maintains the valve closing operation by the valve closing urging means. Thus, the desired action is maintained regardless of the mounting posture of the sewer pipe deodorizer.

According to the closing mechanism of the pivoted on-off valve having the valve closing biasing means of the present invention, the valve body can be easily closed and adjusted by adding the valve closing biasing means having a simple structure. It becomes.
According to the closing mechanism of the pivoting type on / off valve having the first and third valve closing urging means of the present invention, the valve body is always reliably operated regardless of the mounting posture of the pivoting type on / off valve itself. It is abutted against the seat and maintains the closing operation. In addition, there is no obstacle to the passage of fluid.
According to the pivoting on-off valve closing mechanism having the second and third valve closing and urging means of the present invention, the urging force is adjusted stepwise regardless of its own weight, and the urging force is adjusted. The width increases.
By changing the material, width and thickness of the valve closing urging means, and the number of arrangements, the closing force for the valve body can be easily adjusted.
According to the sewage pipe deodorization apparatus and odor prevention apparatus of the present invention, by providing the valve closing urging means, a reliable valve closing operation can be obtained.

An embodiment of a closing mechanism for a pivoted on-off valve according to the present invention will be described with reference to the drawings.
FIGS. 1-7 shows one Embodiment of the obstruction | occlusion mechanism of the pivot type on-off valve of this invention, and shows the example applied to the odor prevention apparatus for sewer pipes. That is, FIGS. 1 to 3 show the overall configuration of the sewage pipe odor prevention apparatus S provided with the closing mechanism of the pivotally mounted on-off valve, and FIGS. 4 to 7 show the configuration of each part. FIG. 8 shows the installation procedure of the odor prevention apparatus S.
In the description of the odor preventing apparatus S, corresponding to the following examples, the direction in which the flowing water is discharged is defined as the front, the side into which the flowing water flows is defined as the rear, and the apparatus itself is defined as the left and right.

Deodorizing device S for sewer pipes (See Figs. 1-7)
The main sewage pipe deodorization device (hereinafter simply referred to as “deodorization device”) S is disposed at the drainage port of the attachment pipe N of the sewage pipe culvert M, and rainwater / drainage from the basin M to the sewer main P The odor escape from the sewer main P is prevented.
FIG. 8 shows the entire configuration of a sewer pipe tub M including the deodorizing apparatus S.
As shown in FIG. 8, the sewer pipe dredger M is configured by a side wall body 100 and a bottom plate 102 to form a main body portion as a container portion that opens upward, and a lid body 106 having a water intake hole 104 at the opening. Placed. The upper edge of the side wall body 100 and the lid body 106 are flush with the road surface H, and rainwater and sewage from the road surface H are introduced into the main body of the ridge M through the water holes 104.
The bottom plate 102 of the main body of the main wall M is placed on the cracked stone J and the leveled concrete K laid on the bottom of the hole excavated from the ground I.
A drainage port 110 is opened on the side wall 100 of the main wall M in contact with the bottom plate 102 or with a slight height, and a mounting pipe N is attached at a predetermined downward angle α from the drainage port 110. The attachment pipe N is connected to a sewer main pipe P located at a deeper position with an appropriate downward angle.

  The deodorizing apparatus S has a main body 10 as a main body, a locking portion is formed integrally with the main body 10, and a valve body and a spacer body are further provided. And the valve closing urging means 1 is added to the valve body.

Main body 10 (see FIGS. 1 to 3)
The main body 10 has a cylindrical body as a base and a locking portion formed at the rear, and a predetermined valve body, that is, a pivoted on-off valve is arranged in the cylindrical body.
That is, the main body 10 is equipped with a cylindrical body 11 that forms a base, a partition wall 12 that is disposed in the cylindrical body 11 at a predetermined angle β with respect to a cylindrical tube axis, and the partition wall 12. It includes a valve body 13 and a locking portion 14 that is connected to the rear portion of the cylindrical body 11, and further includes a spacer ring 15 that is disposed outside the cylindrical body 11.
In this embodiment, α + β <90 ° is normally set, but an embodiment exceeding 90 ° is not excluded.

Hereinafter, the configuration in the main body 10 will be described in detail.
(Cylinder 11)
The cylindrical body 11 has a straight cylindrical body with a predetermined thickness as a basic configuration, and has an outer diameter smaller than the inner diameter of the mounting pipe N with a gap. The front end of the cylindrical body 11 is truncated obliquely with respect to the tube axis, and the rear end is truncated substantially perpendicular to the tube axis.

(Partition wall 12)
The partition wall 12 is arranged transversely with a predetermined angle (β in the present embodiment) on both sides and the upper surface in the cylindrical body 11 to determine the position of the valve body 13 and to close the fluid (running water, Odor).
The partition wall 12 has a predetermined thickness, and forms a gate shape by the side portions 12a and the upper portion 12b, and forms a rectangular opening 12c in the gate shape. The bottom of the opening 12c becomes the inner surface of the cylindrical body 11, and has a curved surface shape. The opening 12c forms a so-called “valve port”.

(Valve 13)
The valve body 13 is disposed in the cylindrical body 11 so as to cover the front surface of the partition wall 12 by sealing the opening 12c of the partition wall 12 in a closed state at the valve-closed position.
Specifically, the valve body 13 is substantially a flat plate having a predetermined thickness, and is formed horizontally between the upper mounting portion 13a, the lower valve main body portion 13b, and the mounting portion 13a and the valve main body portion 13b. It is integrally formed from the V groove 13c as a hinge part. The mounting portion 13a is in contact with the upper portion 12b of the partition wall 12, and is fixed with appropriate fixing tools 17 (bolts 17a and nuts 17b) while maintaining symmetry at one or a plurality of locations (2 in this embodiment). Reference numerals 18 and 19 denote bolt insertion holes provided in the partition wall 12 and the valve body 13 for mounting the fixture 17.
Thus, the valve main body portion 13b is brought into contact with the side portion 12a of the partition wall 12 and opens and closes via the V-groove 13c. Specifically, the valve main body portion 13 b is brought into contact with a part of the upper portion 12 b of the partition wall 12, the side portion 12 a, and the inner peripheral surface of the cylindrical body 11. With respect to a part of the upper portion 12 b and the side portion 12 a of the partition wall 12, the back surface of the valve body portion 13 b is brought into contact with the inner peripheral surface of the cylindrical body 11, and the side surface of the valve body portion 13 b is brought into contact with it.
As the valve body 13 that exhibits the above functions, the valve body 13 is made of a synthetic resin material having appropriate hardness and elasticity, and the V-groove 13c functions as a hinge. Is expected).
Moreover, as the material for the cylindrical body 11 and the partition plate 12, an ABS resin is preferably used.

(Locking part 14)
The locking portion 14 is formed such that an arm portion 21 is integrally extended rearward from the rear end of the cylindrical body 11, and a locking tube 22 is protruded laterally on both sides of the end portion of the arm portion 21. Is done. The locking cylinder 22 is an aspect of the locking means. The arm portion 21 is concentric with the cylindrical body 11 and has the same radius (curvature). In the present embodiment, the arm portion 21 is inclined with a constant inclination angle γ below the tube axis of the cylindrical body 11 on the vertical projection plane, but may be the same as the tube axis. The passing distance of the locking cylinder 22 is made larger than the diameter of the drain port 110 of the mounting pipe N to be mounted, and is locked around the drain port 110. In addition, since this arm part 21 inclines below from the tube axis | shaft of the cylindrical body 11, the latching with respect to the drain port 110 of the attachment pipe N of the latching cylinder 22 arises. In the present embodiment, the inclination angle γ is around 15 °.
In the drawing, reference numeral 22 a denotes an inner hole of the locking cylinder 22. In the illustrated example, the inner hole 22a is a through hole, but it may be a blind hole or no hole.

(Spacer ring 15)
The spacer ring 15 is made of a cylindrical body having a predetermined thickness, and is pushed in from the rear part of the cylindrical body 11 so as to abut on the protrusion 24 protruding from the outer periphery of the cylindrical body 11 of the main body 10. It is fitted on the rear part. Thus, the thickness of the spacer ring 15 is sufficient to close the gap between the installation target mounting pipe N, and the spacer ring 15 maintains the watertightness between the cylindrical body 11 and the mounting pipe N and is cylindrical. Hold the center of the body 11.
The material of the spacer ring 15 is different from other members, and a material having some flexibility and / or a watertight foam is selected.
The spacer ring 15 can be omitted, and a filler is filled between the cylindrical body 11 and the mounting tube instead.
A hard and watertight material is used for the material of members (excluding the spacer ring 15) constituting the deodorization apparatus. A synthetic resin material is recommended because it satisfies this requirement and is lightweight, but does not exclude other materials such as metals.

Valve closing biasing means 1 (see FIGS. 1 to 5)
In the deodorization apparatus S of this embodiment, the valve closing urging means 1 is added to the valve body 13.
The valve closing urging means 1 has one or more (2 in the present embodiment) in the width direction of the valve body 13 and is arranged so as to straddle the V-groove 13c so that the valve main body portion 13b is arranged in a predetermined manner. The urging force is pressed against the front surface of the side portion 12a of the partition wall 12, that is, the valve seat, and the valve closing function is maintained.
More specifically, the valve closing biasing means 1 is made of an elastic material, and includes a spring portion 2 and a mounting base portion 3, and an appropriate mounting means (bolt and bolt) is provided through the bolt insertion hole 4 of the mounting base portion 3. Nuts, embedded bolts, adhesives, and the like) are attached to the attachment portion 13b at the top of the valve body 13. In this embodiment, the fixing means 17 is also used as the attachment means. The spring portion 2 constitutes a functional portion of the valve closing urging means 1 and is disposed across the V-groove 13a of the valve body 13, has an arc shape in cross-sectional shape, and its thickness is reduced as it reaches the tip. That is, when the thickness of the mounting base 3 is h, the thickness near the base of the spring portion 2 is i, and the thickness near the tip is j, h>i> j. The tip of the arc portion of the spring portion 2 protrudes beyond the extension line of the mounting base 3 in a natural state (that is, no load state).
The valve closing biasing means 1 has a planar shape and a trapezoidal shape. However, it is not limited to this aspect. Changes in the thickness and width of the valve closing biasing means 1 contribute to adjustment of the elastic force.
The material for the valve closing urging means 1 is polypropylene resin (PP), polyvinyl chloride resin (PVC), ABS resin because of characteristics (spring elasticity, durability workability, economy, corrosivity, etc.). However, it is not particularly limited, and other synthetic resins, metals, and the like can be used as long as the material has other spring characteristics.

(Operation of valve closing urging means 1)
Thus, in the valve closing urging means 1, the tip of the spring portion 2 protrudes beyond the extension line of the mounting base 3 in a natural state, that is, no load, and in a steady state, the spring portion 2 is bent and deformed. In response, it abuts on the upper surface of the valve body 13b of the valve body 13 with elasticity, and holds the valve closed. Accordingly, the valve closing urging means 1 presses and urges the valve element 13 during normal non-flowing water to keep the valve closed.

(Other valve closing biasing means 1A) (See FIGS. 6 and 7)
6 and 7 show another embodiment of the valve closing biasing means. FIG. 6 shows a planar shape of the valve closing urging means 1A, and FIG. 7 shows a side shape thereof.
The valve closing urging means 1A has an inverted trapezoidal shape in plan view. That is, the spring portion 2A is tapered, and the mounting base portion 3A has the same width. The aspect of the cross section, that is, the thickness is reduced in accordance with the valve closing biasing means 1 as it reaches the tip. The spring elasticity can be freely adjusted according to the material by changing the width and thickness.
Furthermore, what is characteristic in this aspect is that the nut gripping portion 5 is provided with a surrounding wall 5a so as to surround the bolt insertion hole 4 on the front surface of the mounting base portion 3A. A nut gripping recess 5b is formed on the inner side of the surrounding wall 5a.
The nut gripping recess 5b has a hexagonal shape corresponding to the form of the nut, grips the nut 17b of the fixture 17 attached to the part, and prevents its rotation. The nut gripping recess 5 b communicates with the bolt insertion hole 4.
The nut gripping portion 5 improves the reliability of the mounting operation of the valve closing biasing means 1A. That is, the rotational shake of the spring portion 2A of the valve closing biasing means 1A due to the corotation of the nut 17b is prevented, and the main valve closing biasing means 1A can be easily attached.

In the molding / assembly main body 10, the cylindrical body 11, the locking portion 14, the partition wall 12, and the protrusion 24 are integrally formed. The molding may be performed by injection molding or may be made individually and then integrated by adhesive bonding. The bolt insertion hole 18 of the partition wall portion 12 is appropriately drilled.
The valve body 13, the valve closing biasing means 1, and the spacer ring 15 are manufactured separately. The bolt insertion hole 19 of the valve body 13 is drilled corresponding to the bolt insertion hole 18 of the partition wall 12.
In assembling these body parts 10, the bolts 17 a of the fixture 17 are inserted from the back surface of the partition wall part 12, and the valve body 13 and then the valve closing biasing means 1 are inserted into the bolt insertion holes 19 of the bolts 17 of the bolts 17 a. , 4 are inserted, the nut 17b is screwed together, and the nut 17b is rotated and tightened so that they are integrated.
After that, the spacer ring 15 is fitted.

Aspect of Installation In this embodiment, the installation angle α of the mounting pipe N is particularly assumed to be around 20 °, and as described above, other angle elements corresponding to the α. That is, the valve closing angle β of the valve body 13 is set. Thereby, the valve body 13 takes less than vertical (that is, 90 °), and in addition to its own weight, the valve closing biasing means 1 always takes the valve closing state.

(Operation of this embodiment)
The deodorizing apparatus S having the above-described configuration is attached to the attachment pipe N of the sewer pipe dredging M in an intended state, and also exhibits drainage and deodorizing functions as intended functions.

Mounting (see Fig. 8)
In the sewer pipe culvert M, the main body portion 10 of the deodorizing device S is faced to the drain 110 of the mounting pipe N, the main body section 10 is inserted into the mounting pipe N, and through an appropriate operation tool, or The main body 10 is pushed into the mounting pipe N by hand without being interposed.
The attachment tube N is inclined downward at a predetermined angle α, the attachment tube N has a small diameter, and the front end of the main body 10 is obliquely truncated. Make it smooth. In addition, when the main body 10 is further pushed, the spacer ring 15 is held in the center with the mounting pipe N by the elastic action of the spacer ring 15 on the inner wall of the mounting pipe N.
The main body 10 is further pushed in, and the locking cylinder 22 of the locking portion 14 is engaged with the drain port 110. Thereby, this deodorization apparatus S is attached to a predetermined position.

Removal (see Fig. 8)
When the deodorizing device S is removed from the sewer pipe tub M, an appropriate jig is locked in the inner hole 22a of the locking cylinder 22 of the locking portion 14, and the deodorizing device S is attached via the jig. Pull out from tube N. This pull-out operation is facilitated by the locking cylinder 22 being exposed and locked to the drain port 110. It is possible to link the mechanical device to the jig or manually without using the jig.

Closing and deodorizing action The deodorizing apparatus S is mounted in a predetermined state in the mounting pipe N and keeps the closed state at all times.
That is, in the main body 10, the valve body 13 closes the opening 12 c of the partition wall 12 in an inclined state. This valve closing action maintains hermeticity by the dead weight of the valve body 13 and further the urging action of the valve closing urging means 1 (the pressing force of the valve body 13 against the main body portion 13b), and there is no reluctance. A gap between the attachment tube N and the main body 10 is sealed by a spacer ring 15.
Further, when the installation angle α of the mounting pipe N is steeply inclined and the angle of the partition wall 12 of the deodorizing device S exceeds the vertical, the valve element 13 is reliably brought into the valve seat by the biasing action of the valve closing biasing means 1. The contact is made, the valve opening 12c is closed, and the valve closing action is continued.
Odor from the sewer main P is blocked by closing the valve body 13.

Drainage action This deodorization apparatus S is attached in the attachment pipe N in the above state, and performs drainage action when flowing water flows.
Now, when there is rain, rainwater flows into the rainwater basin M, rises to the drain 110, and is discharged from the attachment pipe N to the sewer main P.
The flowing water opens with the water pressure against the dead weight of the valve body 13 and the urging force of the valve closing urging means 1 and flows down. This effect is the same even when the valve body 13 maintains the normal inclination angle and when the valve body 13 exceeds 90 °.
In the present embodiment, the pivotally attached portion of the valve body 13 occupies 80% of the water depth of the main body portion 10, so that efficient drainage is performed for a large amount of running water without becoming full of water.

(Effect of this embodiment)
According to the deodorizing apparatus S of the present embodiment, the insertion operation is easy during the mounting work to the attachment pipe N, and the work effect is improved. In addition, the removal operation is facilitated by the locking cylinder 22 being exposed and locked to the drain port 110.
After installation, the valve can be kept closed at all times to provide a deodorizing action and to accurately handle the inflow of running water. That is, no matter what inclination the deodorizing device S is disposed in the mounting pipe N (particularly when the valve body 13 is in a state exceeding the vertical), the biasing action of the valve closing biasing means 1 The valve body 13 reliably exhibits a valve closing action.

(Other Embodiments) (See FIGS. 9 to 11)
As another aspect of the deodorizing apparatus of this embodiment, as shown in FIGS. 9-11, the deodorizing apparatus S1 provided with the on-off valve (main valve) by a pin and a subvalve is shown.
In this deodorizing apparatus S1, the structure of the cylindrical body 11 and the latching | locking part 14 is based on previous embodiment. Similarly, the partition wall 12 has a gate shape with both side portions 12a and an upper portion 12b, and a rectangular opening 12c is formed in the gate shape.
As for the valve body, the valve body 13A as a main valve is sealed at a fixed position in the opening 12c and is closed (closed) via a pin. For this reason, the first pin holder 26 protrudes from the front upper portion of the partition wall 12 in a relative manner, and the second pin holder 27 protrudes from the upper portion of the front portion of the valve body 13A. The pin 28 is pivotally mounted across these.
The mounting angle β of the partition wall 12 and the valve body 13A is steep compared to the previous embodiment, and the valve body 13A is substantially vertical.
More specifically, the lower end of the valve body 13 </ b> A forms an arc and is seated on the front end surface 11 a of the cylindrical body 11. Thereby, the stop position of the valve body 13A is determined. The lower end of the valve body 13A does not protrude from the front end surface 11a of the cylindrical body 11. The lower end of the valve body 13A may be seated in the cylindrical body 11.
A stopper 30 is attached to the partition wall 12 along both side edges of the front portion of the valve body 13A, and is seated on the front surface of the partition wall 12 in a closed state. Therefore, the stop of the valve body 13A is determined by the contact with the front end surface 11a of the previous cylindrical body 11 and the contact with the partition wall 12 of this stopper. The stopper 30 can be omitted as appropriate.
In the present embodiment, the position of the pin 28 of the valve body 13A takes the 80% water depth position of the mounting pipe N when the apparatus S is installed in the mounting pipe N, so-called 80% water depth position. In addition, when the space | interval of the attachment pipe N and the cylindrical body 11 can be disregarded, it is set to 80% of the pipe rod of the cylindrical body 11. FIG.
With respect to the valve body 13A, the valve closing urging means 1B is disposed across the upper portion 12b of the partition wall 12 and the valve body 13A.

(Deputy valve)
On the valve body 13A of the main valve, an on-off valve 32 is disposed as a sub valve that opens and closes in the same direction as the main valve with a pin shaft.
That is, an opening 33 is formed in the upper part of the main valve body 13A, and the first pin holding body 34 projects from the main valve body 13A so as to face the opening 33 at a position above the back of the main valve body 13A. Corresponding to these, a second pin holding body 35 protrudes from the upper part of the back portion of the auxiliary valve 32, and the pin 36 is pivotally mounted across these.
Therefore, the valve closing biasing means 1 </ b> C is disposed across the upper portion 12 b of the partition wall 12 and the valve body 32 with respect to the opening / closing valve 32 of the auxiliary valve. 2C is a spring part, 3C is a base for attachment. The valve closing urging means 1C can be attached via the attachment base 3C by means of bolts / nuts or an adhesive.
The on-off valve 32 as the auxiliary valve is not limited to pivoting by a pin, and the valve body 13 having the V-groove structure shown in the previous embodiment can be applied. In this case, the upper mounting portion is fixed to the partition wall 12, the lower valve body portion covers the opening 33, and the valve closing biasing means 1 </ b> C has its mounting base 3 </ b> C fixed to the partition wall 12. .

(Operation of the deodorizing device S1)
The manner of installation of the sewer pipe culvert M, such as a rainwater culm, in the odor control apparatus S1 to the attachment pipe N is the same as that described in the previous odor control apparatus S. Therefore, the operation in the attachment / detachment is the same.
The odor generated from the attachment pipe N is blocked by the on-off valve 13A and the auxiliary valve 32 in the odor preventing apparatus S1, and does not escape to the ground. That is, both the valve body 13A and the sub-valve 32 are reliably closed by the urging force urged in the valve closing direction by the valve closing urging means 1B and 1C.
As for the flowing water in the rainwater basin M, the flowing water flowing out from the drain port 110 is against the urging force of the valve closing urging means 1C additionally acting on the valve body 13A due to its water pressure and the valve body 13A. The valve body 13A is pushed open and discharged to the sewer main P.
And about generation | occurrence | production of the abnormal pressure in the sewer main pipe P, the subvalve 32 opens, the abnormal pressure in this sewer main pipe P is released smoothly, and the damage by this abnormal pressure is prevented.

(Effect of the deodorizing device S1)
As with the previous deodorization device S, the on / off valve can be reliably closed regardless of the mounting posture to the mounting pipe N, and the desired action can be exhibited.
Further, in the deodorizing apparatus S1, the occurrence of abnormal pressure in the sewer main pipe P can be prevented by the on-off valve 32 as a sub valve.

(Other embodiment) (refer FIGS. 12-14)
FIGS. 12-14 shows the example of application to the odor prevention apparatus S2 for further sewer pipes provided with the obstruction | occlusion mechanism of the pivoting type on-off valve of this invention.
As shown in FIG. 15, the sewer pipe odor prevention apparatus (hereinafter simply referred to as “odor prevention apparatus”) S2 is arranged on the lid of the sewer pipe tub M, and the sewer main is connected to the sewer pipe lid. It is intended to prevent rainwater and drainage from flowing into the pipe P and prevent odor from escaping from the sewer main pipe P.

As shown in FIGS. 12 to 14, the odor prevention device S2 includes a top plate portion 40 and a water collecting tube portion 45 including two side plates 41, upper and lower front plates 42 and 43, and a bottom plate 44, A mounting type on-off valve 47 is mounted on the lower front plate 43 of the water collecting cylinder 45 via a fixture 48. The top plate portion 40 and the water collecting tube portion 45 constitute a “box” of the odor preventing apparatus S2.
Thus, the valve closing biasing means 1D is arranged for the mounting type on-off valve 47.

This will be described in more detail below.
Top plate 40
The top plate portion 40 has a rectangular flat plate shape as a whole, and has a large rectangular insertion port 40a (reference numeral only) at the center. Further, the edge 40b is placed on the upper edge of the main body of the rainwater M.

Water collecting tube part 45
The water collecting tube portion 45 includes a right and left side plate 41 that is disposed so as to face each other at a predetermined interval, upper and lower front plates 42 and 43 that are disposed across the front end of the side plate 41, and the side plate 41. A box space is formed by a combination of bottom plates 44 arranged across the bottom. Accordingly, the upper portion of the water collecting tube portion 45 is formed as a large water collecting port 45a communicating with the insertion port 40a of the top plate portion 40, and a drainage port 45b is formed on the front surface (front plate 43), from the water collecting port 45a. The inflowing rainwater flows out from the drainage port 45b through the internal space.

(Lower front plate 43)
The lower front plate 43 is disposed across the side plates 41 at the lower part of the front end of the side plate 41, and an opening (valve port) as a drain port 45b is formed around the opening 45b. A valve seat 50 of the protruding ridge is provided. The valve seat 50 forms the same plane. The valve seat 50 is inclined by θ with respect to the vertical plane, and is inclined outwardly downward. Note that θ may be 0 °, that is, a vertical shape. Although the valve seat 50 as a projecting body may be omitted depending on circumstances, in this case, the flat surface of the lower front plate 43 functions as a valve seat.
In the upper part of the lower front plate 43, a plurality of (at least 2, in the present embodiment, 4) first mounting holes 51 are opened at the same level.

Mounted on-off valve 47
The attachment type on-off valve 47 includes a band plate 53 having a bracket and an on-off valve body 55 pivotally attached to the first bracket 54 of the band plate 53. Thus, the band plate 53 is fixed to the upper portion of the lower front plate 43 with a fixing tool 48, and the on-off valve body 55 is pivotally attached to the first bracket 54 of the band plate 53 to open and close the opening 45b of the lower front plate 43.
A metal or a hard synthetic resin is used as the material of the mounting type on-off valve 47 because of non-deformability / hardness requirements, but stainless steel is recommended from the viewpoint of rust prevention.

Specifically, the band plate 53 is made of a hard band, and has a first bracket 54 that is bent at a right angle at both ends and protrudes to the front surface. The band plate 53 is provided with a second mounting hole 56 (only the reference numeral) having the same phase corresponding to the first mounting hole 51 in the upper part of the lower front plate 43. At the fixed mounting position, the first mounting hole 51 and the second mounting hole 56 are coincident with each other, and the fixture 48 is mounted over both the holes 51 and 56. A pin hole 57 is formed in the first bracket 54.
The on-off valve body 55 includes a substantially flat plate valve portion 59 that covers the valve seat 50, and a second bracket 60 that extends upward at the upper ends on both sides of the flat valve portion 59. The flat valve portion 59 is mainly a rectangular flat plate portion having a predetermined length and width that sufficiently covers the valve seat 50. In the present embodiment, the flat valve portion 59 has a bent portion at both side edges and a bent portion at the lower edge.
The second bracket 60 is connected to the upper end of the side edge bent portion of the flat plate portion and is fixed integrally. The interval between the second brackets 60 is slightly larger than the first brackets 54 on both sides of the band plate 53.
The second bracket 60 is provided with a pin hole 61 corresponding to the pin hole 57 of the first bracket 54. The first bracket 54 and the second bracket 60 are in contact with each other via a washer, and the pin 62 is pivotally attached to the pin holes 57 and 61.

With this configuration, the attachment type opening / closing valve 47 is configured such that the band plate 53 and the opening / closing valve body 55 are integrated, and the opening / closing valve body 55 opens and closes around the pin 62 as a rotation center.
Further, the mounting type on-off valve 47 is pivotally attached via the brackets 54 and 60, and the center of rotation of the on-off valve body 55 protrudes forward and is eccentric, so that the on-off valve body 55 can be opened quickly.

Fixture 48
The fixture 48 attaches the attachment type open / close valve 47 to a predetermined position of the front plate 43 of the water collecting cylinder portion 45. In the present embodiment, the bolt 64 and the nut 65 are employed, and the attachment type on-off valve 47 is detachable from the front plate 43.
That is, the first mounting hole 51 of the front plate 43 and the second mounting hole 56 of the main mounting type on-off valve 47 are made to coincide with each other, the bolts 64 are attached to these holes 51 and 56, and the nut 65 is tightened to mount the mounting type. The on-off valve 47 is attached. The bolt 63 is mounted from the back surface of the front plate 43, and the screw portion is protruded from the front surface, a washer is appropriately inserted, and the nut 64 is screwed and tightened.
The attachment type on-off valve 47 adopts a predetermined arrangement relationship by the attachment with the fixture 48. In other words, the flat plate portion 56 of the mounting type on-off valve 47 is in contact with the valve seat 50 evenly and maintains hermeticity. Further, the side bent portion and the lower bent portion wrap around the lower front plate 43 to improve the sealing performance.

Valve closing biasing means 1D
In the present embodiment, a plurality (2 in the present embodiment) of valve closing urging means 1 </ b> D are arranged symmetrically with respect to the mounting type on-off valve 47.
That is, the valve closing urging means 1D extends over the strip 53 of the mounting type on-off valve 47 and the on-off valve body 55, and is arranged at two locations on both sides. That is, the mounting base 3D is fixed to the band plate 53 via appropriate fixing means (including an adhesive), and the tip of the spring portion 2D is brought into contact with the surface of the on-off valve body 55.
In the illustrated example, the valve closing biasing means 1D takes the intermediate position of the fixture 48. However, the same position as the fixture 48, that is, a mode of being fixed to the bolt 64 of the fixture 48 may be adopted.

(Installation of this odor control device S2)
This odor control device S2 is installed in the following manner against rainwater and sewage.
FIG. 15 shows the installation procedure. The odor prevention apparatus S2 places the edge 40b of the top plate 40 on the upper edge 101 of the main body 100 of the rainwater M, and arranges the water collecting cylinder 45 in the internal space. Then, the lid body 106 is placed on the top plate portion 40. Since the top plate portion 40 is a thin plate, it does not affect the installation of the lid body 106.

(Function of this odor prevention device S2)
The odor generated from the attachment pipe N is always blocked by the attachment type on-off valve 47 in the odor prevention device S2, and does not escape to the ground.
In the rain, rainwater flows in from the water collection hole 104 of the lid body 106, flows into the water collection tube portion 45 from the water collection port 45a of the odor prevention apparatus S2, and reaches the drainage port 45b. This flowing water pressure opens the on-off valve body 55 of the attachment type on-off valve 47 at the drain outlet 45b, and rainwater flows from the rainwater M through the attachment pipe N to the sewer main pipe P.

(Operation of the odor control device S2)
According to the sewage odor prevention apparatus S2 of the present embodiment, when the attachment type on-off valve 47 is opened and closed, the opening and closing is smoothly performed by the pivotally attached portion.
That is, the mounting type on-off valve 47 is pivotally attached via the brackets 54 and 60, and the center of rotation of the on-off valve body 55 protrudes forward and is decentered, so that the on-off valve body 55 can be opened quickly. Drainage action is improved.
The on-off valve body 55 of the odor prevention device S2 receives the urging force in the valve closing direction by the valve closing urging means 1D and reliably exhibits the valve closing action.
Further, in assembling the prevention device S2, the attachment type on-off valve 47 can be easily formed only by attaching the fixing tool 48 via the strip plate 53, and exhibits good workability.

(Effect of this odor prevention device S2)
According to the present odor preventing apparatus S2, when the normal installation posture is adopted, the on-off valve body 55 abuts against the valve seat 50 by its own weight and receives the urging force in the valve closing direction by the valve closing urging means 1D. Close the valve securely.
When the upper frame 101 of the sewer pipe rod M is deviated from the normal state, the mounting posture of the odor prevention device S2 is inclined, and the mounting angle θ of the valve seat 50 exceeds the vertical, the opening / closing valve body 55 is provided with a fully closed valve. Since the biasing force in the valve closing direction is received by the biasing means 1D, the valve closing action can be continued.
Therefore, the odor preventing apparatus S2 can prevent odors from any mounting posture.

  The present invention is not limited to the above-described embodiments, and various design changes can be made within the scope of the basic technical idea of the present invention.

The side view which shows the whole structure of the odor prevention apparatus for sewer pipes which has the pivoting-type on-off valve provided with the valve closing energizing means of one Embodiment of this invention (one-direction arrow figure of FIG. 3). The center longitudinal cross-sectional view (2-2 line sectional drawing of FIG. 3) of this apparatus. FIG. 3 is a front view of the apparatus (viewed in three directions in FIGS. 1 and 2). Sectional drawing of the one aspect | mode of a valve closing urging means (4-4 sectional view taken on the line of FIG. 5). FIG. 5 is a view taken in the direction of arrows 5 in FIG. 4. The top view which shows the other aspect of a valve closing urging means (6 direction arrow line view of FIG. 7). FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. The figure which shows the aspect of the installation to the sewer pipe bowl for this sewer pipe bowl odor prevention apparatus. The front view which shows the whole structure of the odor prevention apparatus for sewer pipes which has the pivoting-type on-off valve provided with the valve closing biasing means of other embodiment of this invention (9 direction arrow line view of FIG. 11). FIG. 10 is a sectional view taken along line 10-10 in FIG. 9; FIG. 11 is a view taken in the direction of arrow 11 in FIG. 10. The side view (12 direction arrow line view of FIG. 13) which shows the whole structure of the odor prevention apparatus for sewer pipes which has the pivot-type on-off valve provided with the valve closing energizing means of further another embodiment of this invention. FIG. 13 is a view in the direction of arrow 13 in FIG. 12. FIG. 14 is an enlarged view of a portion 14 in FIG. 13. The figure which shows the aspect of the installation to the sewer pipe bowl of this sewage pipe odor prevention apparatus.

  S, S1 ... deodorization device for sewer pipes, S2 ... odor prevention device for sewer pipes, M ... sewer for pipes, N ... attachment pipe, 1, 1A, 1B, 1C, 1D ... valve closing biasing means, 2, 2A, 2B, 2C, 2D ... spring part, 3, 3A, 3B, 3C, 3D ... mounting base part, 4 ... bolt insertion hole, 5 ... nut gripping part, 10 ... main body part, 11 ... cylindrical part, 12 ... partition wall, 12a ... side part, 12b ... upper part, 12c ... opening, 13, 13A ... valve body, 13a ... mounting part, 13b ... valve body part, 13c ... V groove, 14 ... locking part, 15 ... spacer ring , 21 ... arm part, 22 ... locking part, 26 ... first pin holding part, 27 ... second pin holding part, 28 ... pin, 47 ... mounting type on-off valve, 54, 60 ... bracket, 61 ... pin

Claims (8)

A pivoting on-off valve that opens and closes the valve body by pivotally attaching the valve body with a pivot shaft such as a pin or hinge, and bringing the valve body of the valve body into contact with or away from the valve seat around the valve opening. In
With a material having elasticity, it forms a plate shape, and a valve closing biasing means consisting of an integral spring part and mounting base part is used,
A spring portion of the valve closing biasing means has an arc shape and is disposed across the pivot shaft,
The mounting base is fixed to the valve seat side;
The spring portion has elasticity, and the tip of the spring portion is elastically contacted to the valve body side.
A closing mechanism for a pivoted on-off valve characterized by that. A pivoting on-off valve that opens and closes the valve body by pivotally attaching the valve body with a pivot shaft such as a pin or hinge, and bringing the valve body of the valve body into contact with or away from the valve seat around the valve opening. In
With a material having elasticity, it forms a plate shape, and a valve closing biasing means consisting of an integral spring part and mounting base part is used,
A spring portion of the valve closing biasing means has an arc shape and is disposed across the pivot shaft,
The mounting base is fixed to the valve seat side;
The spring part has elasticity, and the tip of the spring part is arranged with a clearance with the valve body side,
A closing mechanism for a pivoted on-off valve characterized by that.   The closing mechanism of the pivot type on-off valve according to claim 1, wherein any one of polypropylene resin, polyvinyl chloride resin, and ABS resin is selectively adopted as a material of the valve closing urging means.   4. The pivot attachment according to any one of claims 1 to 3, wherein the valve closing biasing means is fixed by a bolt and a nut via a mounting base, and a gripping recess for the nut is formed on the surface side of the mounting base. Type on-off valve closing mechanism. . A deodorizing device disposed on a mounting pipe connected to a drain of a sewer pipe dredging pipe,
An engaging means arranged to engage with a drain outlet of the sewer pipe culvert; and a main body portion provided continuously with the engaging means and disposed in the attachment pipe.
The main body is
A. A cylindrical body having a small outer diameter for holding a predetermined gap than the inner diameter of the mounting pipe, and forming a base;
A. A partition wall that is transversely closed at a predetermined angle in the cylindrical body, and an opening is formed downward in the central portion;
C. The main valve body that can be opened and closed freely, which closes the opening of the partition wall and opens only in the flowing-down direction by rotating around the pivot axis,
D. With a material having elasticity, it has a plate shape, and is composed of a spring part and a mounting base part, and the spring part has an arc shape and is arranged across the pivot shaft of the main valve body, A valve closing biasing means in which a mounting base is fixed to the partition wall side, and the spring portion is elastically contacted to a valve body side that performs an opening and closing operation;
Consists of
The engaging means includes an arm portion that extends from both side surfaces of the rear end of the main body portion while maintaining the same curvature as the main body portion, and a latch that protrudes laterally from the end portion of the arm portion. Consisting of a tube,
A deodorizing device for sewer pipes. A deodorizing device disposed on a mounting pipe connected to a drain of a sewer pipe dredging pipe,
An engaging means arranged to engage with a drain outlet of the sewer pipe culvert; and a main body portion provided continuously with the engaging means and disposed in the attachment pipe.
The main body is
A. A cylindrical body having a small outer diameter for holding a predetermined gap than the inner diameter of the mounting pipe, and forming a base;
A. A partition wall that is transversely closed at a predetermined angle in the cylindrical body, and an opening is formed downward in the central portion;
C. The main valve body that can be opened and closed freely, which closes the opening of the partition wall and opens only in the flowing-down direction by rotating around the pivot axis,
D. A sub-valve body that can be opened and closed freely, closing the opening established in the main valve body, and rotating only around the pivot axis and opening in the direction opposite to the flowing-down direction of running water,
E. It has an elastic material, has a plate shape, and is integrally formed with a spring portion and a mounting base portion. The spring portion has an arc shape and straddles the pivot shaft of the main valve body and the subvalve body. A valve closing urging means, wherein the mounting base is fixed to the partition wall side, and the spring portion is elastically contacted with the valve body side that opens and closes;
Consists of
The engaging means includes an arm portion that extends from both side surfaces of the rear end of the main body portion while maintaining the same curvature as the main body portion, and a latch that protrudes laterally from the end portion of the arm portion. Consisting of a tube,
A deodorizing device for sewer pipes.   The deodorizer for sewer pipes according to any one of claims 5 and 6, wherein the outer periphery of the cylindrical body closes the space between the mounting pipe and means for maintaining the center position with the mounting pipe. In a sewage odor prevention apparatus comprising a water collecting cylinder portion in which a water collecting port is formed above and a drain port is formed on the side,
While having a valve seat that forms the same plane around the drainage port of the drainage cylinder part, a plurality of first mounting holes are opened side by side in the drainage cylinder part above the drainage port,
A band plate having a second mounting hole corresponding to the first mounting hole is fixed with a fixture interposed between the first mounting hole and the second mounting hole at the upper part of the drainage port of the water collecting cylinder portion. And
A non-deformable on-off valve body having a flat valve portion covering the valve seat via a pivot shaft is attached to the band plate,
In addition, it has an elastic material, has a plate shape, and is integrally formed with a spring portion and a mounting base, and the spring portion has an arc shape and is disposed across the pivot shaft of the on-off valve body. The mounting base is fixed to the upper side of the pivot shaft, and the valve closing biasing means is arranged in which the spring part is elastically contacted to the flat valve part side that opens and closes.
An odor control device for sewers.