DK178321B1 - Toilet waste pipe system and vent valve for a toilet waste pipe system - Google Patents

Abstract

A sanitary waste pipe system 1 and a sanitary waste pipe venting valve 13 comprises a valve pipe section 13 with a valve body 7 and a valve control 8, 5 member being adapted for allowing the valve body 7 to move from its closed position to an open position when the pressure in said first end of the valve pipe section 13 is either lower or higher than the pressure in said second end of the valve pipe section 13.

Description

Title: A sanitary waste pipe system and an air venting valve for a sanitary waste pipe system.

The prior art:

The present invention relates to air venting of sanitary waste pipes such as household toilet and drainage pipes and especially to an improved valve for air venting sanitary waste pipes and being adapted for connection to a sanitary waste pipe system, and comprising a valve pipe section having a first end being adapted for connection to a pipe extending upwardly form the sanitation waste pipe system, such as the upper end of a stack pipe and a second end, and where a valve body is arranged in the valve pipe section between said first and second ends and being connected to the valve pipe section so that it is allowed to be positioned in a closed position where it restricts air flow through the valve pipe section and at least one open position where it allows air to flow through the valve pipe section, and where the sanitary waste pipe venting valve further comprises a valve control member being adapted for allowing the valve body to move from its closed position to an open position when the pressure in said first end of the valve pipe section is lower than a certain pressure below the pressure in said second end of the valve pipe section,.

Such air venting valves are often used in sanitary waste pipe systems having an upwardly open vertical stack pipe. In this relation they are used primarily for avoiding odors from the vertical stack pipe but they may be used for other purposes such as air venting of public drainage systems where the valves can be connected to the upper end of a vertical venting pipe extending upwardly from a horizontally extending sewer pipe. Therefore in this context the term sanitary waste pipe system comprises any waste water conducting pipes having one or more pipes extending from the conducting pipe and to free air in order to equalize the pressure in the conducting pipe with the atmospheric pressure.

Especially in relation to air venting of stack pipes, however, the valves are used in order to allow ambient air to enter into the stack pipe when the ambient pressure is higher than the pressure in the stack pipe, and thereby reducing the risk of having occasional pressure variations in the stack pipe due to e.g. water downfall breaking the water trap seals arranged in the stack pipe system.

In order to avoid that air and odors from the stack pipe escapes to the environment, then the valves are adapted for closing the air passage when the pressure in the sanitary waste pipe system is higher than the ambient pressure.

An air venting valve of the above mentioned kind is known from e.g. EP patent application no. 100657 or US patent no. 6532988.

Furthermore US patent no. 5419366 discloses such an air venting valve equipped with two valve units, one adapted for only allowing air from the surroundings into the stack pipe, and the other adapted for only allowing air to escape from the stacked pipe.

The object of the invention:

On this background it is the purpose of the present invention to provide a sanitary waste pipe system and a valve that effectively provides increased protection against odors passing through e.g. the water trap seals, and at the same time reducing the risk of having odors escaping to the environment from the sanitary waste pipe system.

This is achieved by a sanitary waste pipe system and a sanitary waste pipe air venting valve for such a system as mentioned in the introduction, and where the valve control member is furthermore adapted for allowing the valve body to move from its closed position to an open position when the pressure in said first end of the valve pipe section is higher than a certain value above the pressure in said second end of the valve pipe section.

Thereby the air venting valve is able to compensate for pressure drops as well as pressure rises in the sanitary waste pipe system, and at the same time ensuring that no air escapes from the sanitary waste pipe to the environment as long as the pressure in the sanitary waste pipe is near the pressure in the environment (atmospheric pressure). Especially in regions with cold climates the air venting valve is advantageous because it provides such pressure compensation especially in vertical stacked pipes as it reduces the amount of cold air entering from the environment and into the stacked pipe, and thereby the heat loss from e.g. a building where the stacked pipe is installed.

Furthermore the waste pipe will not be cooled by the cold air, and thereby problems with internal condensation on the pipe is reduced, and so is the need for thermal insulation of the pipe. This also reduces the risk of having rats entering into or escaping from the waste pipe.

In a preferred embodiment the valve control is adapted for adjusting said first and/or second certain pressure in said first end of the valve pipe section, so as to provide the possibility e.g. to adapt the valve closing and opening pressures to local standards and building codes.

The valve member is in a preferred embodiment a plate valve arranged inside the valve pipe section and separating the first and the second end of the valve pipe section, and where the plate valve comprises a valve plate. In this relation the valve control is preferably adapted for allowing the valve plate to move into an open position in the first end of the valve pipe section when the pressure in said first end of the valve pipe section is lower than a first certain pressure below the pressure in said second end of the valve pipe section, and to move the valve plate into an open position in the second end of the valve pipe section when the pressure in said first end of the valve pipe section is higher than a second certain pressure above the pressure in said second end of the valve pipe section, and to move the valve plate into a closed position between the open positions in the first and second valve pipe sections when the pressure in the first end of the valve pipe section is higher than the first certain pressure and lower than the second certain pressure.

In an especially simple embodiments the valve plate is mounted in the valve pipe section via a hinge arranged at one side of the valve plate, and the valve control comprises at least one spring element adapted for keeping the valve plate in said closed position when the pressure in the first end of the valve pipe section is higher than the first certain pressure and lower than the second certain pressure, and for allowing the valve plate to move, due to the force applied on the valve plate by pressure difference in the first and the second end of the valve pipe section, into one of its open positions, when the pressure in the first end of the valve pipe section is either lower than the first certain pressure or higher than the second certain pressure and against the spring force applied to the valve plate by said spring element.

In relation to this invention the term spring element is to be understood as being any kind of element that may be elastically deformed to an extend allowing the valve plate to open from its closed position, examples of such springs could be a helical spring, a leaf spring, or a rubber element.

furthermore the valve control may advantageously comprise an adjustment mechanism adapted for adjusting said first and/or second certain pressure in said first end of the valve pipe section by prestressing the spring element, and the adjustment mechanism is preferably accessible from the outside of the valve pipe section.

In order to inhibit heat loss through the sanitary waste pipe venting valve, then the valve plate may preferably comprise thermally insulating material arranged at least on one side of the valve plate so as to provide a thermal insulation between the first and the second end of the valve pipe section, when the valve plate is moved to its closed position. In this relation the outside of at least the first end of the valve pipe section may advantageously also be covered with thermally insulating material.

In an especially simple construction the valve plate extends substantially perpendicular to the side walls of the valve pipe section.

The sanitary waste pipe venting valve according to the invention is especially advantageous for venting sanitary waste pipe systems where the sanitary waste pipe venting valve is arranged at an upper end of a substantially vertical pipe. In this relation the valve pipe section may preferably define a substantially vertical flow path from its first end to its second end.

The drawing:

In the following one or more embodiments of the invention will be described in more detail and with reference to the drawing, where:

Fig. 1: Is a principle sketch, showing a section of a sanitation waste pipe system equipped with a sanitation waste pipe air venting valve according to the invention in a closed position.

Fig. 2: Is a principle sketch, showing the sanitation waste pipe system shown in fig. 1, but with the sanitation waste pipe air venting valve in one open position.

Fig. 3: Is a principle sketch, showing the sanitation waste pipe system shown in fig. 1 and 2, but with the sanitation waste pipe air venting valve in another open position.

Description of exemplary embodiments:

Fig. 1,2 and 3 all shows the same part of a sanitary waste pipe system according to an embodiment of the invention, and in the form of an upper end of a vertically arranged stacked pipe 1 arranged in a building and extending upwardly through the roof 2 of the building. The stacked pipe is connected at its lower end to the sanitary waste pipe system (not shown).

A valve pipe section 13 with a valve plate 7 installed inside is mounted with glue 4 or the like on the top 3 of the stacked pipe 1 extending above the roof 2 of the building.

In this relation it will be obvious to the skilled person that other means for mounting the valve pipe section 13 on top of the stacked pipe 1 are possible, such as the use of prior art elastic or rigid pipe or tube connectors, being adapted for connecting pipe ends having similar or different cross sections. In case of e.g. connecting an elastic tube connector to the top of the rigid stacked pipe one or more hose clamps may be used.

The valve pipe section 13 in this position defines a first end below the valve plate 7 and a second end above the valve plate 7 and being open to free air via the opening 10. In figure 1 the valve plate 7 is shown in a closed position where it restricts flow of air between the first and the second end of the valve pipe section 13.

The valve plate 7 is hinged at one side via a hinge 8 and a spring (not shown) that keeps the valve plate 7 in the closed position when and as long as the pressure difference in the first and the second end of the valve pipe section 13 is smaller than a certain value. If however the pressure in first end of the valve pipe section 13 drops below a certain value, then the valve plate 7 is pressed downwardly as shown by the arrow 11, and against the force of the spring, in the valve pipe section 13 such as it is shown in figure 2. Thereby the valve plate 7 allows free air to enter from outside of the building and into the sanitation waste pipe system, so that e.g. water traps (not shown) arranged in the sanitation waste pipe system are not affected by the pressure drop in the sanitation waste pipe system.

According to the invention the valve plate 7 is, in the same way, allowed to move upwardly as shown by the arrow 12 in figure 3 and into the second end of the valve pipe section 13 in situations when the pressure on the first end of the valve pipe section 13 rises to a certain level above the surrounding pressure outside the building. This position of the valve plate 7 is shown on figure 3, and here the valve plate 7 allows a small amount of air from the waste pipe air venting valve to escape from the sanitation waste pipe system, so that water traps (not shown) arranged in the sanitation waste pipe system are not affected by the pressure rise in the sanitation waste pipe system.

As the volume of air that escapes from the sanitation waste pipe system is very small, then the odors from the sanitary waste pipe system in this situation, will most often not occur, and therefore the sanitation waste pipe air venting valve according to the invention significantly reduces odors escaping from the sanitation waste pipe system with respect to what would be the case if the valve plate was not present. Furthermore in areas with a cold climate the valve reduces the amount of free air that is allowed to enter into the sanitation waste pipe system, and thereby it reduces heat loss from the building.

In order to increase the insulation the valve plate 7 is made of, or comprising a thermally insulating material 6, and the first end of the valve pipe section 13 is also surrounded by a thermally insulating material 9.

It would be obvious for the skilled person to design a spring that provides that control of the valve plate as mentioned above, and therefore the spring is not shown in detail, but in order to adjust the spring force acting on the valve plate 7, then an adjustment screw 5 is mounted on the outside of the valve pipe section 13, so that it is possible for the user to adjust the pressure difference that is necessary before the valve plate 7 opens.

Although the above mentioned embodiment is a preferred embodiment due to its simplicity, then the skilled person would easily recognize that the invention can be implemented in many different embodiments. As an example it is possible to suggest many alternative valve principles that are able to perform the same function, and for the same reason the control of the valve is also possible to implement in alternative embodiments.

Claims (9)

1. Udiuftningsventil to ioiletaffaldsrør adapted for connection to a pipe system ten! toslaiaffald and comprising a ventjlrørsektson with are; arranging first end! for connection with ef afløbsror in toiietatTaidsrørsystemet, such as the upper end of a riser pipes, and a second end. and wherein a valve member is disposed in ventilrørsektionen between the first and second ends and which is movably connected to the ventilrørsektionen so that it can thus be placed in a closed position in which it limits the air flow through the valve pipe section and, in part at least one open position, in which it allows air to flow through the ventilrørsektionen, and wherein the vent valve to the toilet waste pipe further comprises a ventiistyring arranged TLI allowing veniiiele-rnentet to move from its closed position to an open position when the pressure in that> the first end of the ventilrørsektionen is lower than a first, a specific pressure below the pressure in the other end of venUlrørsekiionen, characterized in that the ventilstynngen further adapted to allow ventiieiernentet to move p: g from its closed position to an open position when the pressure in the first end of ventilrørsektionen higher than a second, certain pressure above the pressure at the other end of ventilrørsektionen.

2. Udiuftningsventil to toiletaffaldsrør according to claim 1 characterized in that the friend-tilstyrlngen is adapted to adjust the first and / Eiler, second, certain pressure in the first end of ventilrørsektionen.

3. Udlufiningsventll toiletaffaldsrør to claim 1 or 2, characterized in that the ventiieiernentet is a butterfly valve disposed within the ventilrørsektionen and son? separating the first and the second end of ventilrørsektionen, and wherein the flap valve comprises a valve flap, and ventHstyringen is adapted Fig ai allow the valve to move to an open position of the first end of ventilrørsektionen when the pressure in the first end of ventilrørsektionen is lower than a first, a specific pressure below the pressure in the other end of ventilrørsektionen and moving vontilklappen file an open position on the other end of ventilrørsektionen when the pressure in the first end of ventilrørsektionen is higher than a second determined pressure above the pressure in the other end of ventilrørsektionen and moving ventiiklappen to a closed position between the opening positions of the first and second ventiirørsektion when the pressure in the first end of the valve · · the pipe section is higher than the first, certain pressure and lower than the second set pressure

4. Udkiftningsventi! for toileiaffaldsrør according to claim 3, characterized in that the friend-tilklappen is mounted in ventiirørsektionen via a hinge disposed on a side of the valve flap, and in that the valve control comprises at least one fjederele-ment adapted to keep the valve flap in the closed position when the pressure in the first end of ventiirørsektionen is higher than the first, certain pressure and lower than the second set pressure, and to allow the valve to move, as a result of the force applied to the ventllklappen by Irykforskellen between the first and the second end of ventiirørsektionen, TLI one of its open positions, when the pressure in the first end of ventiirørsektionen is either lower than the first, certain fryk and higher than the second, certain pressure and against the spring force applied to the valve flap of the spring element.

5. Uciuffningsventil toiletaffaldsrør to claim 2 and 4, characterized in that the ventslstyrlngen comprises an adjusting mechanism adapted to adjust the first and / or second, certain pressure in the first end of ventiirørsektionen by biasing the spring member.

6. Udiuitningsvenil! toiietaffaldsrør to claim 5, characterized in that the adjusting mechanism can be accessed from the outside of the ventiirørsektionen.

7. Udiuff.ningsvenfH to toiietaffaldsrør according to one or more of claims 3, 4, 5 or 8, characterized in that the valve flap comprises heat insulating material disposed at least on one side of venkikiappen in order to provide a thermal insulation between the first and other end of the valve pipe section when the valve flap is moved to its closed position.

8. Udiuftningsvenfil toiietaffaldsrør According to claim 7, characterized in that the outside of at least one the first end of ventiirørsektionen is dfBkkei with heat-insulating material.

9. UdSuftningsventii to toileiaffåldsrør according to one or more of claims 3, 4, 5, 6, 7 or 8, characterized in that a ventllklappen extends substantially perpendicular to the side walls of ventiSrørsektionen in its closed position. li ©. Hay rs ^ system; for toilet waste-: PrnfetténdO :: EE udluftnf NGS venf II f if tottet affat cfsror according to any one of or any combination of the preceding claims.