CN210461797U - Check valve - Google Patents

Abstract

The utility model provides a check valve, this check valve includes: the valve body is provided with a flow passage and comprises a first pipe section and a second pipe section which are connected with each other, the first pipe section is provided with a first through hole, the second pipe section is provided with a second through hole, the first through hole and the second through hole jointly form the flow passage, the first pipe section is used for being communicated with a telescopic pipe of the range hood, the second pipe section is used for being communicated with a flue, and the length size of the second pipe section is larger than 85 mm; the plugging assembly is arranged in the flow channel in a swinging mode and has an opening state and a plugging state which are arranged oppositely, when the plugging assembly is in the opening state, the range hood is communicated with the flue, and when the plugging assembly is in the plugging state, the range hood is not communicated with the flue. Through the technical scheme that this application provided, can solve the problem that the check valve leaks cigarette among the prior art.

Description

Check valve

Technical Field

The utility model relates to a lampblack absorber technical field particularly, relates to a check valve.

Background

In general, a check valve is generally installed between a range hood and a flue in a kitchen in order to prevent oil smoke in the flue from flowing back into the kitchen. When the range hood stops working, the blocking component of the check valve is closed to prevent the oil smoke in the flue from flowing back to the kitchen.

However, in the prior art, the side of the check valve communicated with the flue is planar, or the length of the embedded pipe section at the side of the check valve communicated with the flue is too short, so that the check valve cannot be directly inserted into the flue, and a certain distance exists between the tail end of the check valve and the flue, so that oil smoke in the flue can enter a kitchen through a gap between the check valve and the flue. Therefore, the prior art has the problem of smoke leakage of the check valve.

SUMMERY OF THE UTILITY MODEL

The utility model provides a check valve to solve the problem that check valve among the prior art leaked cigarette.

The utility model provides a check valve, check valve includes: the valve body is provided with a flow passage and comprises a first pipe section and a second pipe section which are connected with each other, the first pipe section is provided with a first through hole, the second pipe section is provided with a second through hole, the first through hole and the second through hole jointly form the flow passage, the first pipe section is used for being communicated with a telescopic pipe of the range hood, the second pipe section is used for being communicated with a flue, and the length size of the second pipe section is larger than 85 mm; the plugging assembly is arranged in the flow channel in a swinging mode and has an opening state and a plugging state which are arranged oppositely, when the plugging assembly is in the opening state, the range hood is communicated with the flue, and when the plugging assembly is in the plugging state, the range hood is not communicated with the flue.

Further, the outer diameter of the first tube section is 160mm or 180mm and/or the outer diameter of the second tube section is 160mm or 180 mm.

Further, the surface of the plugging assembly forms an angle with the radial cross-section of the flow-through channel which is greater than or equal to 18 °.

Further, the shutoff assembly includes: the mounting shaft is arranged in the flow passage and connected with the valve body; the blades are arranged in the flow passage, can swing along the mounting shaft and have an opening state and a blocking state; the elastic component is arranged on the installation shaft and/or the valve body and used for resetting the blade so as to restore the blade to a blocking state from an opening state.

Further, the check valve further comprises an auxiliary connecting member connected with the first pipe section or the second pipe section.

Furthermore, the auxiliary connecting piece is provided with a first end and a second end which are arranged along the axial direction, the first end of the auxiliary connecting piece is connected with the first pipe section or the second pipe section, the second end of the auxiliary connecting piece is connected with the telescopic pipe of the flue or the range hood, and the end face of the second end of the auxiliary connecting piece is provided with an annular slot.

Further, the auxiliary connecting piece comprises a first barrel and a second barrel, the first barrel is sleeved on the outer side of the second barrel, and annular slots are formed in the interval between the first barrel and the second barrel.

Further, the auxiliary connecting piece still includes first boss and second boss, and first boss setting is on the inner wall of second barrel, and first boss setting is in the first end of auxiliary connecting piece, and the second boss setting is on the outer wall of first barrel, and the second boss setting is held at the second of auxiliary connecting piece.

Further, the check valve also comprises a sealing piece which is arranged between the plugging component and the valve body.

Furthermore, the check valve also comprises a base, wherein the base is sleeved on the valve body and is positioned between the first pipe section and the second pipe section.

Use the technical scheme of the utility model, this check valve includes valve body and shutoff subassembly. The first through hole of the first pipe section of the valve body and the second through hole of the second pipe section form a circulation channel together, so that oil smoke in a kitchen can be discharged into a flue from the circulation channel. Specifically, when the plugging component is in an open state, the range hood is communicated with the flue so that oil smoke in a kitchen can be discharged into the flue, and when the plugging component is in a plugging state, the range hood is not communicated with the flue so that the oil smoke in the flue cannot flow back into the kitchen. Wherein, through setting up the length dimension with the second pipeline section for being greater than 85mm, can make the second pipeline section directly stretch into in the flue to make the interior oil smoke of flue can not get into the kitchen through the clearance between check valve and the flue, and then can solve the problem that the check valve leaks the cigarette.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural diagram of a check valve provided by the present invention;

fig. 2 shows a front view of the check valve provided by the present invention;

FIG. 3 shows a schematic view of the blade of FIG. 1;

FIG. 4 shows a further structural schematic view of the blade of FIG. 1;

FIG. 5 shows a schematic view of the auxiliary connection of FIG. 1;

fig. 6 shows a schematic structural view of the elastic member in fig. 2.

Wherein the figures include the following reference numerals:

10. a valve body; 11. a first tube section; 12. a second tube section;

20. a plugging component; 21. installing a shaft; 22. a blade; 221. a body; 222. mounting grooves; 23. an elastic member;

30. an auxiliary connection member; 31. a first end; 32. a second end; 33. an annular slot; 34. a first cylinder; 35. a second cylinder; 36. a first boss; 37. a second boss;

40. a base.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 and 2, the present invention provides a check valve, which includes a valve body 10 and a blocking assembly 20. Wherein, the valve body 10 has a flow passage through which the oil smoke in the kitchen can be discharged into the flue. Specifically, the valve body 10 includes a first pipe segment 11 and a second pipe segment 12 connected to each other, the first pipe segment 11 having a first through hole, the second pipe segment 12 having a second through hole, and the first through hole and the second through hole together form a flow passage. In this embodiment, the first pipe section 11 and the second pipe section 12 are both cylindrical structures, a hole is drilled in the wall of a kitchen by using a water drill to communicate the kitchen with a flue, then the second pipe section 12 is arranged in the drilled hole in a penetrating manner to directly extend the second pipe section 12 into the flue, and the first pipe section 11 is communicated with a telescopic pipe of a range hood, so that the installation of the check valve can be completed. In particular, the length dimension of the second pipe section 12 is greater than 85mm, so that the second pipe section 12 can be ensured to directly extend into the flue. In this embodiment, the length of the second pipe section 12 is 150mm, and the length of the second pipe section 12 can be adjusted according to the actual installation situation as long as the second pipe section 12 can directly extend into the flue. For example, the length dimensions of the second tube section 12 may be set to 90mm, 100mm, 120mm, 140mm, 160mm, 180 mm. Wherein the plugging assembly 20 is swingably arranged in the flow channel, the plugging assembly 20 having an open state and a plugging state arranged opposite to each other. By oscillating the occluding component 20 within the flow passage, the occluding component 20 can be switched between an open state and an occluded state. Specifically, when shutoff subassembly 20 is in the open mode, lampblack absorber and flue intercommunication to arrange the oil smoke in the kitchen in the flue, when shutoff subassembly 20 is in the shutoff state, lampblack absorber and flue do not communicate, can prevent that the oil smoke in the flue from flowing back to the kitchen.

By applying the check valve provided by the embodiment, the first pipe section 11 is communicated with the telescopic pipe of the range hood, and the length of the second pipe section 12 is set to be larger than 85mm, so that the second pipe section 12 can directly extend into a flue. When the range hood is started, the plugging component 20 arranged in the circulation channel is switched to an open state, so that oil smoke in a kitchen can be directly discharged into a flue through the circulation channel; when the lampblack absorber stopped working, shutoff subassembly 20 switched to the shutoff state, and lampblack absorber and flue do not communicate this moment, and because second pipeline section 12 can directly stretch into in the flue, the oil smoke in the flue can not get into the kitchen through the clearance between check valve and the flue to can solve the problem that the check valve leaks the cigarette.

Specifically, the diameters of the first pipe section 11 and the second pipe section 12 can be set arbitrarily according to requirements. Wherein the outer diameter of the first pipe section 11 may be set to 160mm or 180mm and/or the outer diameter of the second pipe section 12 may be set to 160mm or 180 mm. Due to the fact that the water drill bits with the diameters of 160mm and 180mm are arranged on the market, the first pipe section 11 and the second pipe section 12 are set to be the same as the water drill bits in size, when the check valve is installed, the water drill bits can be used for drilling holes in the wall of a kitchen, then the check valve is installed in the drilled holes in an interference fit mode, and oil smoke in a flue can be further prevented from entering the kitchen through gaps between the check valve and the flue. In addition, because the water drill bits with the diameters of 160mm and 180mm are easy to purchase in the market, when the check valve is installed in various regions, the problem that the water drill bits matched with the outer diameter of the check valve are difficult to find is avoided, and the applicability of the check valve can be improved. In this embodiment, the first pipe section 11 has an outer diameter of 180mm and the second pipe section 12 has an outer diameter of 180 mm.

By adopting the structure, when the range hood is in a stop working state, if negative pressure occurs in a flue, the plugging component 20 can be kept in a plugging state, so that the phenomenon that oil smoke in the flue flows back to a kitchen cannot occur.

In the present embodiment, the plugging assembly 20 includes a mounting shaft 21, a blade 22, and an elastic member 23. Wherein, the installation axle 21 slope sets up in the circulation passageway, and installation axle 21 and valve body 10 fixed connection. By arranging the vanes 22 in the flow passage and swinging the vanes 22 along the mounting shaft 21, the vanes 22 can be switched between the open state and the closed state. In the present embodiment, two blades 22 having the same shape and size are symmetrically disposed on both sides of the mounting shaft 21, and the two blades 22 are disposed in parallel with the mounting shaft 21. By providing the elastic member 23 on the mounting shaft 21 and bringing the elastic member 23 into contact with each of the two blades 22, the blades 22 can be restored by the elastic member 23 so that the blades 22 can be restored from the opened state to the closed state.

As shown in fig. 6, the elastic member 23 is a constant force spring. The elastic force of the constant force spring can be comprehensively calculated according to factors such as the inclination angle of the blade 22 and the gravity of the blade 22, when the pressure in a working circulation channel of the range hood is positive pressure, the blade 22 can swing along the mounting shaft 21 to completely open the circulation channel, so that oil smoke in a kitchen can be fully discharged into a flue; when the range hood does not work, if negative pressure occurs in the flue, the blades 22 can be completely closed, the flow passage is completely blocked, and the oil smoke in the flue can not enter a kitchen through the flow passage.

As shown in fig. 3 and 4, the blade 22 includes a body 221 and a mounting groove 222, and the mounting groove 222 is provided at the outer circumference of the body 221. When the vane 22 is in the blocking state, the body 221 abuts against the valve body 10 to completely block the flow passage. The body 221 is provided with two rotating shafts on one side thereof close to the mounting shaft 21, the axial directions of the two rotating shafts are parallel to the axial direction of the mounting shaft 21, and the two rotating shafts are both rotatably connected to the valve body 10, so that the vane 22 can swing along the mounting shaft 21. In other embodiments, the blade 22 may be disposed on the mounting shaft 21 to effect oscillation of the blade 22 along the mounting shaft 21. Specifically, the cross-sectional shape of the blade 22 is a butterfly blade structure.

To further increase the flexibility of use of the device, the non-return valve also comprises an auxiliary connection 30, the auxiliary connection 30 being connectable both to the first pipe section 11 and to the second pipe section 12.

As shown in fig. 5, the auxiliary connecting member 30 has a first end 31 and a second end 32 arranged along the axial direction, the first end 31 of the auxiliary connecting member 30 is connected with the first pipe section 11 or the second pipe section 12, the second end 32 of the auxiliary connecting member 30 is connected with a telescopic pipe of a flue or a range hood, and an end surface of the second end 32 of the auxiliary connecting member 30 has an annular slot 33. When the first end 31 of the auxiliary connecting member 30 is connected with the first pipe section 11, the telescopic pipe of the range hood can be inserted into the annular slot 33 of the second end 32 of the auxiliary connecting member 30 to complete the communication between the first pipe section 11 and the range hood. In particular, the annular slot 33 fits into a commercial telescopic tube having a diameter of between 160mm and 180 mm.

The auxiliary connecting member 30 includes a first cylinder 34 and a second cylinder 35, and the first cylinder 34 is sleeved outside the second cylinder 35, so that an annular slot 33 is formed at an interval between an inner wall of the first cylinder 34 and an outer wall of the second cylinder 35. Specifically, the first cylinder 34 and the second cylinder 35 are integrally formed. When inserting the second pipeline section 12 of check valve in the drilling of kitchen, if can't directly stretch into the flue with second pipeline section 12 because of the place restriction, can be connected first end 31 and the second pipeline section 12 of auxiliary connecting piece 30, make first barrel 34 press the second pipeline section 12 into through interference fit's mode, and wear to establish one section extension pipe fitting in auxiliary connecting piece 30's second end 32, make extension pipe fitting press the second barrel 35 into through interference fit's mode, utilize extension pipe fitting can directly stretch into the flue with the check valve. Or, when the check valve is installed, if the outer diameter of the second pipe section 12 is not matched with the inner diameter of the drilled hole, the first end 31 of the auxiliary connecting member 30 may be connected to the second pipe section 12, and a reducer pipe having the same size as the drilled hole is inserted into the second end 32 of the auxiliary connecting member 30, so that the check valve is installed smoothly. In this embodiment, the outer diameters of the first pipe segment 11 and the second pipe segment 12 are both 180mm, the inner diameter of the second cylinder 35 of the auxiliary connecting member 30 is 160mm, if a water drill bit with an outer diameter of 160mm is used for drilling, a reducer pipe with an outer diameter of 160mm can be inserted into the second cylinder 35 of the auxiliary connecting member 30, and the check valve can be smoothly installed in the drill hole with an outer diameter of 160 mm.

Specifically, the auxiliary connecting member 30 further includes a first boss 36 and a second boss 37, the first boss 36 is disposed on the inner wall of the second cylinder 35, the first boss 36 is disposed at the first end 31 of the auxiliary connecting member 30, the second boss 37 is disposed on the outer wall of the first cylinder 34, and the second boss 37 is disposed at the second end 32 of the auxiliary connecting member 30. When the first end 31 of the auxiliary connection member 30 is inserted into the first pipe segment 11 or the second pipe segment 12, the second boss 37 on the outer wall of the first cylinder 34 can be used to limit the excessive insertion of the auxiliary connection member 30 into the first pipe segment 11 or the second pipe segment 12; when inserting the extension or reducer pipe from the second end 32 of the accessory connector 30 into the second barrel 35, the first boss 36 on the inner wall of the second barrel 35 may be used to limit the insertion of the extension or reducer pipe into the second barrel 35. Specifically, the first boss 36 is an annular boss disposed around the inner wall of the second cylinder 35, and the second boss 37 is an annular boss disposed around the outer wall of the first cylinder 34. With the above structure, the length of the auxiliary connection member 30 can be reduced while satisfying the function of the auxiliary connection member 30, and the production cost can be reduced.

Wherein, the check valve further comprises a sealing element which is arranged between the plugging component 20 and the valve body 10 and can improve the sealing performance of the device. Specifically, the sealing member is sealed the pad for silica gel, and sealed the pad setting of silica gel is on body 221 and insert and establish in mounting groove 222, so set up, and sealed pad of silica gel can not take place to warp and drop, can guarantee the sealed sealing performance who fills up of silica gel. When the plugging component 20 is in a plugging state, the silicone gasket on the body 221 of the blade 22 is tightly combined with the valve body 10, so as to improve the sealing property between the plugging component 20 and the valve body.

Specifically, the check valve further includes a base 40, and the base 40 is sleeved on the valve body 10 and is located between the first pipe section 11 and the second pipe section 12. In the present embodiment, the base 40 and the valve body 10 are integrally formed, so that the production cost of the device can be reduced. Due to the device provided by the embodiment, the second pipe section 12 has the same size as the drilled hole of the kitchen, the check valve is installed in an interference fit mode, cracks around the drilled hole in the wall can be shielded by the base 40, and therefore the indoor attractiveness can be improved.

The device provided by the embodiment has the following beneficial effects:

1. the length of the second pipe section 12 is set to be larger than 85mm, the second pipe section 12 can directly extend into the flue, and oil smoke in the flue can be prevented from entering a kitchen through a gap between the check valve and the flue.

2. By setting the outer diameter of the first pipe section 11 to be 160mm or 180mm and the outer diameter of the second pipe section 12 to be 160mm or 180mm, the outer diameters of the first pipe section 11 and the second pipe section 12 can be matched with the water drill bits with the diameters of 160mm and 180mm on the market, and the applicability of the check valve can be improved.

3. The included angle between the surface of the plugging component 20 and the radial section of the flow channel is set to be more than or equal to 18 degrees, when the range hood is in a stop working state, if negative pressure occurs in a flue, the plugging component 20 can be kept in a plugging state, and therefore the phenomenon that oil smoke in the flue flows back to a kitchen cannot occur.

4. By providing the auxiliary connection 30, it is possible to connect either the first end 31 of the auxiliary connection 30 to the first pipe section 11 or the first end 31 of the auxiliary connection 30 to the second pipe section 12. When the first end 31 of the auxiliary connecting piece 30 is connected with the first pipe section 11, the telescopic pipe of the range hood can be inserted into the annular slot 33 of the second end 32 of the auxiliary connecting piece 30, so that the first pipe section 11 is communicated with the range hood; when the first end 31 of the auxiliary connecting member 30 is connected to the second pipe segment 12, if the second pipe segment 12 cannot directly extend into the flue, a section of elongated pipe fitting can be inserted into the second end 32 of the auxiliary connecting member 30, so that the elongated pipe fitting directly extends into the flue. If the outer diameter of the second pipe section 12 does not match the inner diameter of the bore hole, a pipe having the same size as the bore hole may be inserted into the second end 32 of the auxiliary connecting member 30 to smoothly install the check valve.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A check valve, characterized in that it comprises:

the range hood valve comprises a valve body (10) and a valve body, wherein the valve body (10) is provided with a circulation channel, the valve body (10) comprises a first pipe section (11) and a second pipe section (12) which are connected with each other, the first pipe section (11) is provided with a first through hole, the second pipe section (12) is provided with a second through hole, the first through hole and the second through hole jointly form the circulation channel, the first pipe section (11) is used for being communicated with a telescopic pipe of a range hood, the second pipe section (12) is used for being communicated with a flue, and the length of the second pipe section (12) is larger than 85 mm;

plugging component (20), can swing ground and set up in the circulation passageway, plugging component (20) have the open condition and the shutoff state of relative setting, work as when plugging component (20) are in the open condition, the lampblack absorber with the flue intercommunication, work as when plugging component (20) are in the shutoff state, the lampblack absorber with the flue does not communicate.

2. Non-return valve according to claim 1, characterized in that the outer diameter of the first pipe section (11) is 160mm or 180mm and/or the outer diameter of the second pipe section (12) is 160mm or 180 mm.

3. Non-return valve according to claim 1, characterized in that the surface of the blocking assembly (20) has an angle greater than or equal to 18 ° with a radial section of the flow channel.

4. Non-return valve according to claim 1, characterized in that the blocking assembly (20) comprises:

a mounting shaft (21) disposed in the flow channel, the mounting shaft (21) being connected to the valve body (10);

a vane (22) disposed within the flow passage, the vane (22) being swingable along the mounting shaft (21), the vane (22) having the open state and the closed state;

the elastic piece (23) is arranged on the mounting shaft (21) and/or the valve body (10), and the elastic piece (23) is used for resetting the blade (22) so as to restore the blade (22) from the opening state to the blocking state.

5. Non-return valve according to claim 1, characterized in that it further comprises an auxiliary connection (30), said auxiliary connection (30) being connected with said first pipe section (11) or with said second pipe section (12).

6. Non-return valve according to claim 5, characterized in that the auxiliary connection (30) has a first end (31) and a second end (32) arranged in the axial direction, the first end (31) of the auxiliary connection (30) being connected to the first pipe section (11) or the second pipe section (12), the second end (32) of the auxiliary connection (30) being connected to a telescopic pipe of a flue or range hood, the end face of the second end (32) of the auxiliary connection (30) having an annular slot (33).

7. Non-return valve according to claim 6, characterized in that the auxiliary connection (30) comprises a first cylinder (34) and a second cylinder (35), the first cylinder (34) being fitted on the outside of the second cylinder (35), the space between the first cylinder (34) and the second cylinder (35) forming the annular slot (33).

8. Non-return valve according to claim 7, characterized in that the auxiliary connection (30) further comprises a first boss (36) and a second boss (37), the first boss (36) being provided on the inner wall of the second cylinder (35) and the first boss (36) being provided at the first end (31) of the auxiliary connection (30), the second boss (37) being provided on the outer wall of the first cylinder (34) and the second boss (37) being provided at the second end (32) of the auxiliary connection (30).

9. Non-return valve according to claim 1, characterized in that it further comprises a seal arranged between the blocking assembly (20) and the valve body (10).

10. Non-return valve according to claim 1, characterized in that it further comprises a seat (40), said seat (40) being fitted over said valve body (10) and being located between said first pipe section (11) and said second pipe section (12).

Images