KR102356646B1 - Air admittance valve for sewage pipes of buildings - Google Patents

Abstract

The present invention is to provide a ventilation valve (1) for a sewage pipe (100) of a building, which is installed on a sewage pipe (100) of a building to block odor and to perform smooth drainage while introducing external air to the sewage pipe (100). The ventilation valve of the present invention comprises: a main body (2) having a ventilation hole (21) penetrating vertically to introduce external air to the inside so as to supply the same to a sewage pipe (100) by being installed to communicate with the sewage pipe (100); an opening and closing means (4) installed to slidably open and close the ventilation hole (21) of the main body (2) by negative and positive pressures generated in the sewage pipe (100); and a ventilation cover (3) coupled to an upper part of the main body (2), and having an external air inflow hole (31) penetrating the inside and outside to introduce certain external air to the inside while protecting the opening and closing means (4) of a lower part from the outside. Accordingly, an opening/closing action of the ventilation valve (1) can be more smoothly performed even in case of long-term use. Also, odor can be fundamentally blocked by preventing the odor from the sewage pipe (100) from being leaked through the ventilation valve (1). In addition, a service life of the ventilation valve (1) can extend, such that economical loss and inconvenience of use are reduced.

Description

Air admittance valve for sewage pipes of buildings

The present invention relates to a ventilation valve for a sewage pipe in a building, and to explain this in more detail, it is installed in a sewage pipe of a building to allow outside air to flow into the sewage pipe while blocking odors and smoothly draining a vent valve for a sewage pipe of a building it's about

In general, when building a building, sewage pipes are installed to drain the living sewage used as washbasins, bathtubs, toilets, and drains. , the sewage from each household is collected and drained through a sewage pipe or a septic tank buried underground. A trap in the form of a trap is installed to prevent backflow of odors from sewage pipes or septic tanks. In this case, the negative suction pressure acts on the drain pipe and air must be supplied from the outside, so a vent valve (mini vent, air vent, air supply It is supplied to the sewage pipe by introducing external air through a valve, etc.), and is configured to block the outflow of foul odors generated in the sewage pipe or generated in the septic tank or sewage pipe to the outside.

Conventional vent valves for sewage pipes are disclosed in Republic of Korea Patent Publication No. 67092 (published on June 21, 2011), Patent Registration No. 1472968 (published on December 16, 2014) and Utility Model Registration No. 478332 (September, 2015). As seen in the notice on the 18th day), an external vent hole protrudes outside the upper end of the main body and penetrates inside and out, and an internal vent hole penetrates into the main body by a foreign substance prevention mesh is formed inside the upper end of the main body, and the main body The upper cap is formed on the upper part of the upper part to block the external vent hole and the internal vent hole from the outside, and it is placed on the top of the external vent hole inside the cap. (負壓), the external vent hole is opened, and after the domestic sewage is discharged from the sewage pipe, it is lowered by the static pressure generated in the sewage pipe to close the external ventilation hole. A flexible opening and closing ring made of rubber or silicone referred to as a sealing member or air seat or opening and closing ring was made to be provided.

The opening/closing ring made of rubber material is made of a thin sheet in the shape of a donut, so if it is used to a certain extent, it oxidizes by itself or is deformed by the pressure caused by the continuous discharge of domestic sewage from the sewage pipe. Even if it is placed in the upper part of the ventilator, it is closely adhered and cannot completely close the external vent hole, so that part of it is opened and the odor flowing back through the sewage pipe has a problem in that it is diffused into the interior of the building through the vent valve, and the opening and closing ring is oxidized or deformed In this case, there was a problem that the opening and closing action of the vent valve could not be performed properly despite the negative or positive pressure in the sewage pipe because the evacuation was not smoothly performed by the guide member that guides the opening and closing when the opening and closing ring is lifted. As the structure is to close the vent hole by descending by the weight of the ring, when the vent valve is not installed vertically with the wrong drainage horizontal pipe and is inclined to one side by more than 15°, the opening/closing ring inside the vent valve descends due to its own weight. Frictional force was generated in the guide that guides the lift, and the opening and closing ring did not close the vent hole properly, so it had a number of problems, such as continuous inflow of external air or discharge of odors.

KR 10-2011-0067092 A 2011. 6. 21. KR 10-1472968 B1 2014. 12. 16. KR 20-0478332 Y1 2015. 9. 18.

In the present invention, a new technology was invented to solve the problems of the prior art, and the opening/closing ring opened and closed by the negative and positive pressure of the drain pipe in the conventional vent valve is easily oxidized and deformed, and thus the opening/closing means of the vent valve. By changing the structure of the ventilation valve to meet this, the ventilation valve for the sewage pipe of a building prevents the emission of odors by firmly blocking the ventilation valve even if the opening and closing means deteriorate due to the long-term use of the ventilation valve. The main object of the invention is to provide

In addition to this, there is no deformation even when the opening and closing means is used for a long period of time compared to the opening and closing ring of the conventional vent valve, and even if some constituent members are oxidized or deformed or the vent valve is installed with an inclination, the opening and closing operation is performed smoothly.

In addition, although not separately described, other objects within the scope that can be inferred in consideration of the specific contents, claims, drawings, etc. included in the overall solution.

As a specific means for solving the problems of the present invention, the present invention constitutes a vent valve for a sewage pipe of a building, but the vent valve for a sewage pipe of the building of the present invention is installed to communicate with the sewage pipe, and external air is introduced inside, A main body having a vent hole penetrating up and down to supply it to the sewage pipe, an opening/closing means installed to slide and open the ventilation hole of the body by the negative and positive pressure generated from the sewage pipe, and the upper part of the body coupled to the lower part opening and closing While protecting the means from the outside, it is characterized in that it includes a ventilation cover in which the outside air inlet hole is formed through the inside and outside so that a predetermined amount of outside air is introduced into the inside.

The opening/closing means of the present invention includes a disk that is elastically supported by a spring from the inside of the main body and is installed to slide up and down, and an inlet hole fixed on the upper side of the main body and formed to penetrate vertically in the middle by the lifting action of the lower disk. It characterized in that it includes a support cap provided to open and close, and an opening and closing flap fixed to the upper end of the disk and interposed so as to be in close contact between the disk and the support cap.

The opening and closing flap is formed to be thin from the inside to the edge while the edge is extended upward, and when the disk slides upward, the flexible edge is bent when in contact with the lower surface of the support cap so that the contact area between the support cap and the opening and closing flap is widened. do it with

The support cap is configured to increase the contact force between the support cap and the opening/closing flap by slanting to expand downwardly from the edge of the inner inlet through hole to the outer edge so that the edge of the opening and closing flap in contact with the lower surface is bent downward along the inclined surface of the lower surface of the support cap. It is characterized in that the inclined structure is included.

It characterized in that it further includes an annular contact protrusion configured to protrude downward from the inner edge of the inlet hole of the support cap and to come into contact with the inner upper surface of the opening and closing flap to make double contact with the edge of the opening and closing flap.

The ventilation cover includes a cover body formed to block the upper portion of the inlet through hole of the support cap in the middle, a coupling wall bent down to the edge of the cover body and fixed to the edge of the body or the edge of the support cap, and an edge or coupling wall of the cover body It is characterized in that it includes several outdoor air inlet holes through which external air is introduced into the upper part of the , wherein the outdoor air inlet holes are upward and downward through several radially at the edge of the cover body and on the upper part of the coupling wall. It is characterized in that it consists of several outward external air inlet holes that penetrate horizontally in and out in connection with the radially upward external air inlet holes.

According to the specific means for solving the above problems, the ventilation valve for the sewage pipe of the building of the present invention has a disk elastically supported by a spring instead of an on/off ring in the conventional ventilation valve equipped with an on/off ring and the lifting action of the disk on the disk. A flexible opening and closing flap is interposed between the disk and the support cap while a fixed support cap is formed by the In contrast to the deformation and odor blocking, the opening/closing means of the present invention consists of a disk, a support cap, and an opening/closing flap between them. Even in the event of an emergency, the disc resiliently supported by the spring presses the opening and closing flap further with the support cap, so that the opening and closing action of the vent valve is made more smoothly, and the sewage pipe or septic tank odor that has flowed back into the sewage pipe does not leak through the vent valve. It is possible to block the occurrence of odors at the source, thereby extending the period of use of the ventilation valve, thereby reducing the economic loss due to frequent replacement and purchase, and reducing the effort of replacement. It is an invention with great effect.

1 is a three-dimensional view of an assembled state showing a preferred example of the present invention;
2 is a three-dimensional view of an isolated state showing a preferred example of the present invention;
3 is a cross-sectional view of an assembled state showing a preferred example of the present invention;
4 is a cross-sectional view showing another form of the support cap in the present invention;
5a and 5b are partially fractured three-dimensional views of the opening and closing flaps in the present invention and partially fractured three-dimensional views showing a change in shape when closed in contact with the support cap
6A and 6B are a three-dimensional view and a cross-sectional view in which a separate fixing ring is applied instead of an integral fixing protrusion in the opening and closing flap in the present invention.
7A and 7B are exemplary views showing a state in which the vent valve of the present invention is installed in the drain pipe of the toilet, a cross-sectional view showing the state of the toilet and the drain pipe when the toilet is drained
8A and 8B are exemplary views showing a state in which the vent valve of the present invention is installed in the drain pipe of the toilet, a cross-sectional view showing the state of the toilet and the drain pipe when the toilet is restored after draining the toilet, and an excerpted cross-sectional view of the vent valve

An object of the present invention is to provide a ventilation valve for a sewage pipe of a building installed in a sewage pipe of a building to allow external air to flow into the sewage pipe while blocking odors and smoothly draining the building, which is more specifically with the drawings below. However, the accompanying drawings are only examples for easily explaining the content and scope of the technical idea of the present invention, and are not limited thereto, and the terms used are also only for describing the embodiment in detail and are limited to the corresponding terms. should not be construed as

The vent valve 1 for the sewage pipe 100 of the building of the present invention is composed of a lower body 2 and an upper vent cover 3 as shown in FIG. 1 , as shown in FIG. An opening/closing means (4) is provided between the main body (2) and the ventilation cover (3) to open and close the ventilation valve (1) to block the inflow of external air and the discharge of odors.

The main body 2 is installed with the upper end of the ventilation pipe 101 as shown in FIG. 3 installed on one side of the sewage pipe 100 to communicate with the sewage pipe 100, coupled to the lower inside, or connected to the ventilation pipe 101 The coupling steps 2a are respectively installed on the inside and outside so that the upper end of the connection pipe 102 is installed to be coupled to the outside of the lower part as shown in FIG. Ventilation holes 21 penetrating up and down are provided so as to be supplied to the sewage pipe 100 .

In the upper portion of the ventilation hole 21 of the main body 2, the inclined portion 23 is inclined so that the middle protrudes upward, and the inclined portion 23 has the lower vent 21 and the upper opening/closing means (4). A plurality of through holes (24) that are penetrated through the vent hole (21) so that foreign substances are not only filtered when external air is introduced into the vent hole (21), but also can block various insects or foreign substances from being discharged through the vent hole (21) inside the sewage pipe (24) ) is provided with a geolmang body 22 made of.

The ventilation cover (3) is coupled to the upper part of the main body (2) to protect the lower opening/closing means (4) from the outside, but blocks the inflow of foreign substances and blocks strong wind pressure from the upper part to the lower part (4) This is configured to prevent arbitrarily opening, and the outdoor air inlet hole 31 is formed inside and outside so that a predetermined amount of outside air is introduced into the inside, so that when outside air flows in, various insects or foreign substances from the outside In order to block the inflow into the interior, the penetrating volume of the outdoor air inlet 31 is the volume of the inlet through hole 71 of the support cap 7 of the opening and closing means 4 and the filter mesh body 22 of the main body 2 ) of the through hole 24, so that the external air supplied to the sewage pipe 100 through the vent valve 1 is constant so as not to interfere with the drainage, the opening and closing action of the opening and closing means 4 is smooth can make it happen.

At this time, as shown in FIGS. 2 to 4 , the opening/closing means 4 passes through the ventilation holes 21 on the inner and upper sides of the main body 2 , negative pressure and positive pressure generated from the drain pipe 100 . The opening/closing means 4 is provided with a disk 5 that is elastically supported upwards by a spring 6 from the inside of the main body 2 and slides up and down by the disk 5, at this time. On the inner surface of (2), a pair of sliding guide projections 25 standing up and down are formed to protrude inwardly facing each other, and on the outside of the disk 5, a disk 5 is placed between a pair of sliding guide projections 25. The sliding support protrusion 51 , which is supported to be slid during the elevating of the , is integrally formed so that the disc 5 does not move and smoothly elevates from the inside of the main body 2 .

When necessary, a sliding guide hole 26 formed vertically through the middle of the filter mesh body 22 of the main body 2 is provided, and when the disk 5 is lifted, the sliding guide hole 26 is formed in the lower center of the disk 5. It may be configured to be provided with a sliding support rod 52 that protrudes downward to be slidably guided.

In addition to this, the opening/closing means 4 is provided with a support cap 7 that is fixed to the upper side of the main body 2 and opened and closed by the lifting action of the lower disk 5 in which the inlet through-hole 71 formed to penetrate vertically in the middle is opened and closed. It is fixed to the upper end of the disk 5 and the flexible edge protruding obliquely so as to extend upwardly and outwardly is configured such that an opening and closing flap 8 that is in close contact between the disk 5 and the support cap 7 is interposed.

At this time, the lower portion of the spring 6 protruding upward from the outer lower portion of the main body 2 geolmangche 22 and elastically supporting the disk 5 inward between the inclined portion 23 and the resting projection 61 is placed therein. is configured, and spaced apart from the lower side of the disk 5 at a predetermined distance to form a pair of inner protrusions 62 into which the upper portion of the spring 6 is inserted, so that the spring 6 is formed between the body 2 and the disk. (5) is to be configured so as not to be separated between.

In the present invention, the opening/closing flap 8 is formed to be thinner from the inside to the edge while the edge is extended upward as shown in FIG. 5A. As shown, the flexible edge is bent while in contact with the lower surface of the support cap 7 so that the contact area between the support cap 7 and the opening/closing flap 8 is widened.

As shown in FIG. 3, when the opening and closing flap 8 is fixed to the upper end of the disk 5, for example, the locking support 54 protruding upward from the center of the upper end of the disk 5 and protruding outward from the upper portion is integrally formed. A protrusion 53 is provided, and a coupling hole 81 penetrating vertically to be coupled to the coupling protrusion 53 is formed in the middle of the corresponding opening/closing flap 8, and the opening/closing flap 8 is made of flexible rubber or When it is made of silicone and urethane, etc., when it is coupled to the disk 5, the coupling hole 81 is expanded to expand wider than the engaging support 54 at the upper part of the coupling protrusion 53, and when released, it is contracted to its original state and the coupling protrusion 53 ), the upper part of the opening/closing flap (8) is caught and supported by the locking support (54), and an annular fixing protrusion (82) on the inside of the opening/closing flap (8), that is, on the upper or lower edge of the coupling hole (81). The opening and closing flap 8 is firmly fixed between the upper surface of the disk 5 and the lower surface of the engaging support 54 of the engaging projection 53 by integrally forming (formed on the upper part in the drawing), and the opening and closing flap 8 and the engaging projection (53) It is possible to completely block the emission of odors.

In the opening and closing flap 8, as shown in FIGS. 6a and 6b, instead of the annular fixing protrusion 82 integrally formed on the upper or lower edge of the coupling hole 81, it is manufactured separately from the opening and closing flap 8 A ring-shaped fixing ring 83 made of an elastic material such as rubber, silicone, or urethane may be provided, and the fixing ring 83 may be provided with the upper surface of the disk 5 and the coupling protrusion 53 as shown in FIG. 6B . ), the opening and closing flaps 8 can be firmly fixed between the lower surfaces of the locking supports 54, and in FIG. 6b, the fixing ring 83 is coupled to the upper part of the opening and closing flaps 8, ), the fixing ring 83 may be coupled to the lower portion.

The support cap 7 in contact with the opening and closing flap 8 of the present invention is inclined to expand downwardly from the inner inlet through hole 71 edge to the outer edge as shown in FIG. It is preferable to include an inclined structure 72 configured to increase the contact force between the support cap 7 and the opening/closing flap 8 by bending downward along the inclined surface 73 of the lower surface of the support cap 7, As shown in FIG. 4 by the inclined structure 72, the support cap 7 is horizontally formed from the edge of the inlet through hole 71 to the outer edge, as shown in FIG. Since the edge of the flap 8 is further bent downward, the contact force is increased and the contact area is widened compared to the horizontally bent edge, so that the blocking of the odor is better achieved.

And the support cap 7 has an annular contact protrusion 74 that protrudes downward from the inner edge of the inlet hole 71 of the support cap 7 as shown in FIGS. 3 and 4, so that the inside edge of the opening and closing flap 8 is formed. It is configured to double contact with the edge of the opening/closing flap 8 that was in contact with the lower surface of the support cap 7 from the outside in contact with the upper surface, that is, the inner upper surface.

As shown in FIGS. 1 to 4, the ventilation cover 3 for protecting the opening and closing means 4 has a cover body 32 blocking the upper part of the inlet hole 71 of the support cap 7 is formed in the center, and the cover The coupling wall 33 is bent downwardly on the edge of the body 32 and fixed to the edge of the main body 2 or the edge of the support cap 7 is formed, and the edge or coupling wall 33 of the cover body 32 is formed. Several outside air inlet holes 31 through which outside air is introduced are formed at regular intervals in a radial direction through the inside and outside of the upper portion of the .

These outdoor air inlet holes 31 are an upward fresh air inlet hole 311 through which several radially penetrate up and down on the edge of the cover body 32 and a radially upward outdoor air inlet hole 311 on the upper portion of the coupling wall 33 . ), several of which are formed of outward external air inlet holes 312 penetrating into and out of the horizontal plane.

The vent valve 1 for the sewage pipe 100 of the building of the present invention configured as described above is used in places of water use 200 such as toilets, washbasins, bathtubs and floor drains, as shown in FIGS. 7A and 7B. When draining domestic sewage mixed with later water to the sewage pipe 100, negative pressure is generated in the sewage pipe 100 when drainage is made to a sewage pipe or a septic tank through the sewage pipe 100, which prevents smooth drainage. A vent valve (1) is installed in each of the Koja sewage pipes (100) to supply external air to the sewage pipes (100) according to the number of households or the number of water use destinations (200) such as guest rooms.

To explain its action in more detail, as shown in FIG. 7A, when flushing the toilet at the water use place 200, the domestic sewage passes through the trap 201 of the toilet and drains to the sewage pipe 100, and the sewage pipe ( 100), as the negative pressure lower than atmospheric pressure is generated on the other side while drainage is made to one side, the disk 5, which was elastically supported by the spring 6 in the body 2, as shown in FIG. 7b is lowered, and the vent valve 1 ) is opened by the opening and closing means 4, that is, as the disk 5 descends, the opening and closing flap 8 coupled and fixed to the coupling protrusion 53 of the upper portion of the disk 5 is spaced apart from the support cap 7 The outside air passes through the outside air inlet 31 of the upper outside air inlet 31 of the cover body 32 of the ventilation cover 3 and the outward outside air inlet 312 of the coupling wall 33 through the support cap 7 ) is introduced through the inlet through hole 71 of the main body 2 and turns to the outside of the disk 5 from the inside of the main body 2 through the through hole 24 of the filter mesh 22 under the disk 5. The supply is made to the sewage pipe 100 through the pores 21, so that the negative pressure is changed to a positive pressure, so that drainage is performed smoothly.

After drainage is performed as shown in FIG. 7A , as shown in FIG. 8A , the trap 201 is blocked and the backflow of odors flowing back through the sewage pipe 100 to the water use destination 200 is blocked. Before some of the bad odors flowing back through the drain pipe 100 are discharged to the vent valve 1, the inside of the drain pipe 100 is in a positive pressure state, not a negative pressure, so as shown in FIG. 8B, the body ( 2) As the disk 5 rises from the inside, the opening/closing flap 8 fixed to the coupling protrusion 53 on the upper portion of the disk 5 is closely interposed between the support cap 7 and the disk 5, so that the support cap ( 7), the inlet through hole 71 is blocked, so that it is possible to fundamentally block the odor from being discharged to the outside air inlet 31 of the ventilation cover 3 through the inlet through hole 71 .

At this time, the flexible opening/closing flap 8 with its edges extended upwards contacts the bottom surface of the support cap 7 as the edges are bent, so that the contact area is widened, so that odor blocking is more reliably achieved, and the support cap 7 When the inlet through hole 71 is formed of the inclined structure 72 inclined higher than the outside, the edge of the opening and closing flap 8 is in contact with the inclined surface 73 of the lower portion of the inclined structure 72, and the edge end is bent more downward. It is possible to increase the odor blocking rate by increasing the contact area and improving the blocking power of the contact surface.

In addition to this, an annular contact protrusion 74 formed downwardly below the edge of the inlet hole 71 of the support cap 7 is in contact with the upper surface of the inner side at the edge of the opening and closing flap 8, the edge of the opening and closing flap 8 Blocking is made more fundamentally by the double contact between the bent contact portion and the contact portion of the contact projection 74 of the opening and closing flap 8 and the support cap 7, and the opening and closing flap coupled to the engaging projection 53 ( 8), the annular fixing protrusion 82 formed upward on the edge of the coupling hole 81 of the coupling protrusion 53 is brought into contact with the lower portion of the locking support 54 of the upper portion of the coupling protrusion 53, so that the lower surface of the locking support 54 and the disk ( 5) It is possible to fundamentally block the odor from being emitted even between the coupling protrusion 53 and the opening and closing flap 8 while more firmly fixing the opening and closing flap 8 between the upper surfaces.

According to the present invention, the opening/closing means 4 of the present invention consists of a disk 5, a support cap 7, and an opening/closing flap 8 therebetween. Even if it occurs, the disc 5 that is elastically supported by the spring 6 rises, so the opening and closing flap 8 is further pressed with the support cap 7 so that the odor that flows back into the sewage pipe 100 flows out through the vent valve 1 It is possible to block the occurrence of odor at the source, and the opening and closing action of the vent valve 1 is made more smoothly. Phosphorus loss can be reduced, and various effects can be obtained, such as reducing the effort required for replacement.

As described above, in the detailed description of the present invention, the most preferred embodiment of the present invention has been described, but various modifications are possible within the scope that does not depart from the technical scope of the present invention. It is not limited to the example, but the scope of protection should be recognized from the techniques of the claims to be described later and equivalent technical means from these techniques.

1: Vent valve
2: main body 2a: coupling step 21: ventilation hole 22: filter mesh 23: inclined part 24: through hole 25: sliding guide projection 26: sliding guide hole
3: ventilation cover 31: outdoor air inlet hole 311: upward outdoor air inlet hole 312: outward outdoor air inlet hole 32: cover body 33: coupling wall
4: opening and closing means
5: Disc 51: sliding support protrusion 52: sliding support bar 53: coupling protrusion 54: jamming support
6: Spring 61: Anterior projection 62: Internal mouth projection
7: Support cap 71: Inlet through hole 72: Inclined structure 73: Inclined surface 74: Contact protrusion
8: opening and closing flap 81: coupling hole 82: fixing protrusion 83: fixing ring
100: sewage pipe 101: ventilation pipe 102: connection pipe
200: Water use (seat toilet, washbasin, bathtub, floor drain, etc.) 201: Trap

Claims (7)

The main body 2 provided in communication with the sewage pipe 100 and provided with vent holes 21 penetrating up and down so that external air can be introduced inside and supplied to the sewage pipe 100, and the barrel of the body 2 The opening/closing means 4 installed to slide and open the pores 21 by negative and positive pressure generated from the sewage pipe 100, and the upper part of the body 2 are coupled to the upper part of the main body 2 to protect the lower opening/closing means 4 from the outside. A vent cover 3 in which an outdoor air inlet 31 penetrates inside and outside so that predetermined external air is introduced into the interior, and an inclined portion with a center protruding upward in the upper portion of the vent 21 of the main body 2 ( 23) and a plurality of through holes 24 formed in the inclined portion 23 through the lower vent 21 and the upper opening/closing means 4 to filter foreign matter when external air is introduced into the vent 21. It includes a geolmangche 22 made of;
The opening/closing means (4) is elastically supported by a spring (6) from the inside of the main body (2) to the upper part of the main body (2), and the disc (5) is installed to slide up and down, and is fixed to the upper side of the main body (2) and is fixed to the middle A support cap 7 provided with an inlet through hole 71 penetrating vertically through the lower disk 5 by the lifting action of the lower disk 5, and a disk 5 between the disk 5 and the support cap 7 an opening/closing flap (8) which is fixed to the upper end of the and interposed so that the edge is in close contact with the support cap (7) is included;
The opening/closing flap 8 is formed to be thin from the inside to the edge while the edge is extended upward, and when the disk 5 slides upward, the flexible edge is bent when in contact with the lower surface of the support cap 7, and the support cap 7 and the contact area of the opening/closing flap 8 is widened;
The support cap 7 is inclined to expand downwardly from the edge of the inlet hole 71 on the inside to the outer edge, so that the edge of the opening and closing flap 8 in contact with the lower surface is lowered along the inclined surface 73 of the lower surface of the support cap 7 . A ventilation valve for a sewage pipe of a building, characterized in that the inclined structure (72) is configured to be bent to increase the contact force between the support cap (7) and the opening/closing flap (8).
The method of claim 1 ;
An annular contact protrusion 74 that protrudes downward from the inner edge of the inlet hole 71 of the support cap 7 and comes into contact with the inner upper surface of the opening/closing flap 8 to make double contact with the edge of the opening/closing flap 8. Ventilation valve for sewage pipe of a building, characterized in that it is further included.
delete delete delete delete delete

Images