JPH0135235B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to connection valves to pipelines, and more particularly to partial vacuum (underpressure)
By introducing ambient air into the pipeline through the valve, the occurrence of air can be substantially completely prevented, and the valve is provided with a ring-shaped movable valve plate made of an elastic material, and the valve plate is provided with a valve on one side of the valve plate. The pressure that flows through the opening in the center of the plate acts in the cylindrical valve chamber communicating with the pipeline, and the atmospheric pressure on the other side acts against the force that biases the valve plate towards the valve seat. The present invention relates to a connection valve to a pipeline which is arranged to close an inlet for ambient air when said other side of the valve plate abuts the valve seat. This connection valve is primarily automatically opened and connects to the drainage or water supply system.
It allows the introduction of air to eliminate the formation of a partial vacuum, and is also hermetically sealed to be completely closed in the absence of a partial vacuum.

[Conventional technology]

Since the wastewater flows through the unfilled pipes and carries air with it, it is necessary to provide the drainage system with an air inlet in order for it to work well. Without an air inlet, the partial vacuum would be high enough that the drain would be sucked out, allowing sewer gases to freely enter the surrounding room. Usually said air inlet has an air intake pipe that terminates above the roof of the building. In winter, therefore, the problem arises that the water vapor flow from the air intake tube condenses and forms ice or frost at the outlet, which sometimes makes air intake impossible. This condition can be prevented by terminating the air inlet within the automatic valve chamber. However, this is achieved provided that the valve is made sufficiently reliable. Terminating the pipe indoors is economical because the piping is simple and construction is easy, and the risk of roof leakage is also eliminated.

Normally, the air valve must be fully closed and must be fully opened when the partial vacuum reaches 5 mm VP or more. It must have a large capacity with a small negative pressure, which allows it to be used in drainage pipes where a drainage depth of 50 mm must be protected. The amount of air conveyed during sluice reaches 30 times that of sluice fluid, and the pressure difference is 50mmVP.
It is clear that the air valve must not cause the area to compress.

Similar problems are encountered in water pipe systems where reduced pressure in the main pipe can cause waste water, for example water from the toilet or washing machine, to be sucked back into the main pipe.
To prevent the sucking back of waste water, so-called vacuum valves are usually arranged in cooperation with toilets or washing machines.

A known valve of the type mentioned above is disclosed in Swedish patent no.
Disclosed in No. 325237. In this known valve, the movable valve member has a flexible annular diaphragm, the outer edge of which is sealingly attached to the valve cover and the inner edge of which engages the knife-edged upper edge of the vent opening. The diaphragm normally engages the vent opening under its own weight. In order for the valve to operate properly, the diaphragm must be well centered and mated, which is particularly difficult in that the diaphragm is not accessible for inspection after the valve is assembled. Yet another drawback is that even given the large radial size of the valve, the open area between the diaphragm and the vent opening is extremely limited.

Pneumatic valves are known which have a spring-biased valve disc (or flap) which is pivotally mounted and normally compressed against the valve seat. A sealing engagement is provided by providing a seal of elastic material on the valve disc. Over time, it easily occurs that the shape of the valve disc changes or that it enters an oblique position. When this happens, it becomes impossible to seal the seal to the valve seat with the action of a weak spring force.

Further, the air valve disclosed in Japanese Patent Publication No. 54-39048 is a valve for preventing the inside of a pipe from becoming partially vacuumed by sucking outside air into the pipe. The pneumatic valve includes a movable annular valve member made of an elastic material, such that pressure within a valve chamber communicating with the tube through a central opening of the valve member is applied to one side of the valve member, and the other side is connected to a valve seat. engages and closes the outside air introduction opening,
In the pneumatic valve in which the external air pressure acts against the action of a force biasing the valve member in the direction toward the valve seat, the valve member is configured as an annular disc, and the valve member is configured as an annular disc, and the valve member is connected to an inner edge of the disc. The disk is disposed so as to extend cantilevered from a hub, and the hub is mounted for axial movement on a guide pin, and the valve seat is composed of two rings, which allow the introduction of outside air. forming an opening;
A pneumatic valve is disclosed in which the inner and outer edges of the valve disc are in sealing engagement with one end of each ring in the closed position of the valve.

However, without axial guidance, the above-mentioned pneumatic valves run the risk of the valve disc tilting and being forced into a position oblique to the vertical axis of the tube. There is also the risk that the sliding movement will be blocked by dirt and dust adhering to the guide pins.

In order to avoid the above-mentioned disadvantages of the known valves, further valves have been proposed in which the movable part is simply arranged in a substantially cylindrical valve housing with an annular inlet opening. The clearance or play in the radial direction of the valve plate must be extremely small when said valve plate assumes its sealing position. Otherwise, if the periphery of the valve plate assumes a position abutting the inner wall of the valve housing, it will not be possible to cover the inlet opening. Furthermore, the diameter of said inner wall must decrease upwardly from the valve seat so that if the valve plate assumes an inclined position, the valve plate cannot remain in said inclined position resting against the inner wall of the valve housing. It won't happen.
This means that when the valve plate assumes the tilted position, the lowermost outer edge of the valve plate is clamped against the inwardly sloped inner wall, thereby occupying the valve plate in the open position. If a relatively high lifting height is obtained, the diameter of the inner wall at the roof of the valve housing is approximately equal to the outer diameter of the valve plate, so that in particular ring-shaped valve plates can easily press and fix the valve plate. There is a further risk that the valve plate becomes compressed in the open position so that the required non-circularity can be easily obtained. This is especially the case if the air valve is stored lying on one side during the period before use, in which case the elastic sealing ring may become permanently deformed, ie non-circular or distorted.

[Problem to be solved by the invention]

The present invention solves various problems as described above, and although it has a simpler structure than known valves, it is more reliable in its operation than conventional valves, and the movable valve member or valve seat is less likely to be distorted. Another object of the present invention is to provide a pneumatic valve that does not cease operating in a planned manner even if it becomes twisted.

[Means to solve the problem]

In order to solve the above-mentioned problems, according to the present invention, the pressure plate is arranged on the top of the valve plate with a small clearance with respect to the inner wall of the valve chamber and prevents the oblique positioning of the pressure plate around its periphery. It comprises a ring-shaped pressure plate of rigid material with an axially extending guide having an axially smaller dimension than its inner height.

[Effect]

As a result of the axially extending guide, the pressure plate becomes positioned slightly obliquely during the movement towards the valve seat, since the pressure plate of conventional construction without the guide according to the invention is positioned slightly obliquely.
It is prevented from becoming stuck against the inner wall of the valve housing, which could easily occur. If the valve is stored lying on one side,
If the resilient valve plate is designed to adhere to the underside of the pressure plate, it will remain flat. A pressure plate in which the valve plate is held constant by an axial guide in a position with the pressure plate parallel to the plane of the valve seat, even though the valve plate is designed to be able to move freely in relation to the pressure plate. is maintained substantially flat.

A particular advantage conferred by the valve plate of the described construction is that it can be made very light. In the occurrence of a period of insufficient pressure of short duration followed by a period of overpressure, both the pressure plate and the valve plate will have a much larger mass than the pressure plate when the overpressure is implemented, with the valve plate having a larger mass. Although quickly returned to the closed position, it is first forced upward. Even if the lightweight valve plate does not seal completely on the first movement,
In any case, a strong restriction is obtained until the pressure plate descends onto the valve plate which sufficiently seals the valve plate against the valve seat.

In the known embodiment with only one ring-shaped valve plate, when closing the obliquely positioned valve plate, a rolling movement takes place first, which greatly slows down the closing movement. Such drawbacks are not observed in the valve according to the invention since it prevents the pressure plate from being positioned diagonally.

The through flow area is not limited by limits on valve plate travel. This is because the movement described above can be made arbitrarily large without difficulty. There is a large area between the concentric rings forming the valve seat, which determines the flow area. Therefore, the area can be given the required size without inappropriately increasing the size of the air valve. Furthermore, since the valve plate made of elastic material is arranged to be loaded by the guided pressure plate, small deflections or torsions of the valve plate have little effect on its operation.

Embodiments of the present invention shown in the drawings will be described in detail below.

〔Example〕

The illustrated air valve consists of a lower pipe connector 1 whose upper end is formed as an inner valve seat 2 . An outer ring 3, which is concentric with the lower pipe connector 1 and has an outer valve seat 4, is connected to the lower pipe connector 1 via a stay 5. The opening between the lower pipe connector 1 and the valve seat 4 forms an air inlet 6 for ambient air.

The outer ring 3 of the air valve is provided with a cover 7 on its top, which in some applications closes off the valve chamber 8 thus formed, but in the illustrated embodiment it is not It has an opening 9 and an upper pipe connector 10. The air valve can be connected to a water system (not shown) by means of pipe connectors 1 and 10.

In the illustrated embodiment, the movable valve body of the pneumatic valve is made of two separate annular parts, namely a lightweight valve plate 11 of elastic material and a pressure plate 12 with an axial guide 13 of rigid material around its periphery. Become. This axial guide 13 is connected to the pressure plate 12
It projects upwardly around the pressure plate 12 and has a small clearance with the inner wall of the valve chamber 8. When liquid passes through the valve or the valve contains liquid, the pressure plate 12 is configured to prevent liquid from penetrating into the upper surface of the valve plate and preventing the valve plate from being subjected to excessive deformation pressure. It is glued along the surface that abuts the plate 11 or joined to said surface in any other suitable manner. The guide 13 can be non-porous. Also, as shown, apertures 14 can be provided to save material and reduce weight. The solid upper edge of the guide 13 can optionally be omitted, so that only the axial stay 15 remains for the guide 13.

As shown, the air valve is normally closed.
When a partial vacuum is created in the pipe connectors 1, 10 or in the valve chamber and reaches approximately 5 mm VP, the atmospheric pressure acting on the other side of the valve plate 11 lifts the valve plate and the pressure plate 12, so that the air inlet 6 flows through and breaks the partial vacuum. Valve plate 1
1 is held in a horizontal position by the pressure plate 12, the guides 13 of the pressure plate 12 preventing the pressure plate 12 from being positioned diagonally. When the partial vacuum ends or an overpressure follows, the valve plate 11 and the pressure plate 12 return to their respective illustrated positions, so that the valve plate 11 can be closed or the pressure plate 12 reaches the illustrated position. Beforehand, the valve plate 11 can be pressed against the valve seat.

Although not shown, the valve plate or pressure plate includes at least one central opening for communication with the valve chamber. As mentioned above, the valve can also be designed as a valve with a closing opening 9, but it can also be designed as a through-flow valve for gases or preferably liquids.

The pressure plate 12 is arranged on top of the valve plate 11 and the pressure plate 12 has an axially oriented guide 13.
The guide 13 prevents the soft valve or sealing plate from tilting inside the chamber. pressure plate 1
By arranging the guide on 2, there is no risk that extra friction and dust or dirt will prevent the movement of the valve plate 11. Additionally, pressure plate 12 holds the flexible valve plate flat.

〔Effect of the invention〕

The valve according to the invention comprises a ring-shaped movable valve plate made of elastic material. The pressure circulating in the pipeline acts on one side of the valve plate, while the atmospheric pressure acts on the other side of the valve plate, which abuts the valve seat.
Arranged on the valve plate is a ring-shaped pressure plate made of a rigid material and provided around its periphery with a guide, which prevents the soft valve plate from tilting within the chamber. Also, since the pressure plate is not of sliding construction with guide pins, there is no risk of extra friction and dust or dust blocking the movement of the valve plate. Furthermore, the pressure plate can always be held flat even if the flexible valve plate or valve seat tends to warp or twist to some degree, and despite its simpler construction than known valves, The action is more reliable.

[Brief explanation of drawings]

The drawing shows a preferred embodiment of the pneumatic valve according to the invention, the left half of which shows a vertical section through the valve chamber and the right half a section through the valve and the pressure plate. Explanation of symbols, 2...Inner valve seat, 4...Outer valve seat, 6...Air inlet, 8...Valve chamber, 11...Valve plate (ring-shaped movable valve plate), 12...Pressure plate ,
13... Guide, 15... Axial stay.

Claims (1)

Claims: 1. The generation of a partial vacuum is virtually completely prevented by introducing ambient air into the pipeline by means of a valve having a ring-shaped movable valve plate 11 made of an elastic material, said valve When one side of the plate is subjected to pressure circulating in a cylindrical valve chamber communicating with the pipeline through an opening in the center of the valve plate, and the other side of the valve plate abuts the valve seat, In a connecting valve to a pipeline arranged to close an annular inlet 6 for ambient air, a ring made of a rigid material and arranged at the top of the valve plate with a small clearance against the inner wall of the valve chamber. a shaped pressure plate 12, which pressure plate is provided with an axially oriented guide 13 around its outer periphery, said guide being arranged to prevent oblique positioning of said pressure plate and within said valve chamber. A connecting valve to a pipeline, characterized in that it has a dimension smaller in the axial direction than its height. 2. A connection valve to a pipeline according to claim 1 or 2, characterized in that the axial guide has the shape of a ring-shaped wall (13). 3. The pipeline connection valve according to claim 1 or 2, wherein the axial guide has the shape of an axial stay 15 that guides against the inner wall of the valve chamber.