GB1581501A - Creación de Inventos y Patentes con Inteligencia Artificial

GB1581501A – Through-flow valve
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GB1581501A – Through-flow valve
– Google Patents
Through-flow valve

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Publication number
GB1581501A

GB1581501A
GB1093678A
GB1093678A
GB1581501A
GB 1581501 A
GB1581501 A
GB 1581501A
GB 1093678 A
GB1093678 A
GB 1093678A
GB 1093678 A
GB1093678 A
GB 1093678A
GB 1581501 A
GB1581501 A
GB 1581501A
Authority
GB
United Kingdom
Prior art keywords
valve
inner tube
valve according
valve seat
flow
Prior art date
1978-03-20
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)

Expired

Application number
GB1093678A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Danfoss Fluidtechnik GmbH

Original Assignee
Concordia Fluidtechnik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1978-03-20
Filing date
1978-03-20
Publication date
1980-12-17

1978-03-20
Application filed by Concordia Fluidtechnik GmbH
filed
Critical
Concordia Fluidtechnik GmbH

1978-03-20
Priority to GB1093678A
priority
Critical
patent/GB1581501A/en

1980-12-17
Publication of GB1581501A
publication
Critical
patent/GB1581501A/en

Status
Expired
legal-status
Critical
Current

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Classifications

F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL

F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING

F16K24/00—Devices, e.g. valves, for venting or aerating enclosures

F16K24/02—Devices, e.g. valves, for venting or aerating enclosures the enclosure being itself a valve, tap, or cock

Description

(54) THROUGH-FLOW VALVE
(71) We, CONCORDIA FLUIDTECH
NIK G.m.b.H., a German limited liability company, of Talstrasse 41, 7000 Stuttgart 1,
Federal Republic of Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
This invention relates to a through-flow valve for a liquid at a temperature near its boiling point. Such a valve is used particularly for hot water appliances, and includes a valve closure member co-operating with a valve seat to provide a restncted flow opening for passage of the liquid.
Through-flow valves to control the quantity of a specific flow are known. Such valves are also in some cases used for controlling a liquid which is at a temperature near its boiling point. For example, it is well-known that in the case of a hot water apPliance, particularly a coffee machine, valves have to be used through which boiling water passes. In this situation, the problem arises that deposits of lime must be avoided so that the function of the valve itself, i.e. to provide a tight seal, can be maintained. For this purpose, valves have been proposed in which a rubber diaphragm is used as the closure member, which offers the advantage that at every closure, it vibrates and in this way any lime is removed.
Separating the lime however involves the disadvantage that an increase in resistance varies the flow quantity. In particular, when controlling flow of boiling water, it has been found that at the area of smallest crosssection of flow of the valve, which as a rule is the restricted flow opening provided by the valve seat and valve closure member, cavitation occurs behind flow edges, or resistance due to local negative pressure can in some cases lead to a considerable interruption of the flow. At the same time, at places where cavitation occurs, undesired secretion of lime also occurs relatively quickly and can in turn encourage cavitation. Therefore, the present invention is based on the problem of providing a through-flow valve in which occurrence of cavitation and thus also of formation of a lime deposit at the restricted flow opening is largely avoided.
According to this invention there is provided a through-flow valve for a liquid at a temperature near its boiling point, comprising a valve closure member co-operating with a valve seat to provide an opening which constitutes the area of smallest crosssection of the valve for passage of the liquid, wherein at least one vent aperture is disposed downstream of and immediately adjacent the opening. This arrangement counteracts the formation of negative pressure in the area of the opening because the vent aperture provides for natural equalisation of pressures. The uncontrolled occurrence of steam bubbles and the effect they have on flow can be avoided.
It is advantageous to construct the vent aperture as an annular gap around the flow passage immediately downstream of the said opening and exposed to ambient pressure through an annular chamber. Structurally, it is simple to form the annular gap and the annular chamber between a nozzle insert carrying the valve seat and an inner tube which is pushed into the insert. In this way, production difficulties can be reduced. In an advantageous embodiment the nozzle insert widens out conically downstream of the valve seat because then the said opening is upstream of a flow passage cross-section which may be larger than that of the opening. The top edge of the nozzle insert can be directly formed with the valve seat and the end of the inner tube close to the valve seat may be tapered conically upwardly, and at a cone angle which is as large as that of the nozzle insert.Thus the nozzle-like construction occurs at the valve seat, the flow through it being in the opposite direction.
This has the advantage that an annular zone can form behind the said opening and provide equalisation of pressures, reliably preventing cavitation, and any lime which may be deposited on the edge can have no influence on the magnitude of flow. There is also the advantageous secondary effect that the compensating air or colder column of air flowing into the annular passage in the opposite direction to the hot water can, after the apparatus has been switched off, relatively quickly cool the inner tube and this, with a suitable choice of material, gives rise to changes in the form of the thin inner tube by virtue of temperature fluctuations, so that any deposited lime can easily be peeled off.A further advantage is that after partial closure of the valve, flow from the inner tube can take place easily because the air does not have to flow from the bottom upwards through the outflowing liquid but can from the outset flow from above through the annular gap. Therefore, the valve also permits of substantially more rapid discharge than known constructions.
It is advantageous for the inner edge of the cone part of the inner tube to have a diameter which is somewhat larger than the diameter of the said opening, because it has been found that a direct application of the jet of liquid flowing through the valve onto the top edge of the inner tube and ingress of liquid into the annular chamber can then be avoided.
The invention will now be described by way of example, with reference to the drawing, in which:
Fig. 1 is a diagrammatic partial section through an electromagnetic valve;
Fig. 2 is an enlargement of part of Fig. 1 showing the nozzle insert with the valve seat and inner tube;
Fig. 3 is a cross-section through the inner tube of the nozzle insert on the line III-III; and
Fig. 4 is a further enlarged section showing the construction of the valve and the upper edge of the inner tube which, together with the valve seat, forms an annular gap for venting the opening provided by the valve seat and a valve closure member.
Referring to the drawing, Fig. 1 shows an electromagnetic valve, the magnetic part 1 of which actuates through a plunger, in a manner not shown, a diaphragm 2 which is stretched taut over a wire ring 3 fixed on the plunger by a connecting member 4. The diaphragm 2 constitutes a valve closure member and co-operates with a valve seat 5 which forms the top edge of a nozzle insert 6 integral with the valve body 7, made for example of plastics material. The fluid medium to be controlled, in the present case boiling water, flows in the direction of the arrow 9 into the valve body 7 and out again in the direction of the arrow 10 when the valve closure member is lifted off the seat 5.
Pushed into the nozzle insert 6 is an inner tube 11 which has stop lugs 12 resting against an abutment 13 in the body 7 and located in the nozzle insert 6. In this way the inner tube 11 is secured in position. Between the nozzle insert 6 and the inner tube 11 is an annular space 14 communicating with the ambient air through slots 15 between the lugs 12, see particularly Figs. 2 and 3.
At the top end, both the nozzle insert 6 and the inner tube 11 are conically inwardly tapered, to produce a nozzle-like construction. But the flow (9, 10) is in the opposite direction, which is different from the usual case with nozzles. As seen in Fig. 4, the top edge 16 of the valve seat 5 is rounded and adjacent to it is a cone part 17 which is inclined downwardly and outwardly at an angle a of 45 , merging then into a cylindrical part. The inner tube 11 has at the same angle a a cone part 18, the inside of which forms a rounded part 19 which then likewise merges into a cylindrical tubular part. The upper inner edge 20 of the inner tube 11 is of a diameter somewhat larger than the inside diameter of the valve seat, so that a jet of liquid entering when the diaphragm 2 is opened cannot strike the edge 20 of the inner tube 11.
The electromagnet 1 is connected by tags 21 to an electrical source of supply, and when it is energised, the diaphragm 2 is moved from the closed position shown in
Fig. 1 into the open position, and liquid flows from the interior of the valve body 7 through the valve seat 5 into the inner tube 11 and out in the direction of the arrow 10.
When this happens, at the opening provided by the valve seat 5 and the valve closure member, which opening as shown constitutes the area of smallest cross-section of the valve for passage of the liquid, equalisation of pressures takes place through an annular gap 22, with the ambient air present in the annular space 14, so counteracting any formation of negative pressure downstream of the valve seat 5. The annular gap is, as shown, disposed downstream of and immediately adjacent the said opening. The boiling water can therefore not be subject to cavitation phenomena due to localised negative pressure. A pressure equalising zone will form within the annular wall part 19.
Even if deposits of lime should form on this wall part, they will have no effect on the flow because they do not arise at the said opening. Thus, on the one hand a constant through-flow is ensured for a liquid at a temperature near its boiling point, because cavitation phenomena are avoided, while on the other hand the valve is suitable for controlling boiling water, because even deposits of lime cannot have such harmful effects as in known valves, due to the avoidance of cavitation, while even should lime deposits form, they can do so only at places where they have little or no effect on the rate of flow.
The valve of the invention also has the advantage that the inner tube 11 can be made very thin and from a suitable material.
Therefore whenever the valve is put into use or its use is discontinued, this inner tube 11 is subject to considerable temperature fluctuations which, by virtue of heat expansion, means that deposits of lime, should any have been formed, can break off again. Therefore, the valve is particularly suitable for controlling flow of boiling water. Also the construction of the valve closure member as a taut rubber diaphragm 2 counteracts the segregation of lime on the valve seat, because, when actuated, the diaphragm is subject to elastic deformation which automatically removes lime deposit.
WHAT WE CLAIM IS:
1. A through-flow valve for a liquid at a temperature near its boiling point, comprising a valve closure member co-operating with a valve seat to provide an opening which constitutes the area of smallest crosssection of the valve for passage of the liquid, wherein at least one vent aperture is disposed downstream of and immediately adjacent the opening.
2. A valve according to claim 1 wherein the vent aperture is an annular gap.
3. A valve according to claim 2 wherein the annular gap is subject to ambient pressure which reaches it via an annular chamber.
4. A valve according to claim 3 wherein the annular gap and the annular chamber are formed between a nozzle insert carrying the valve seat and an inner tube in the nozzle.
5. A valve according to claim 4 wherein the nozzle insert, starting from the opening, has a conically outwardly widening part.
6. A valve according to claim 4 or claim 5 wherein the top edge of the nozzle insert is the valve seat.
7. A valve according to any of claims 4 to 6 wherein the end of the inner tube close to the valve seat also has a conical part.
8. A valve according to claim 7 wherein the conical part of the inner tube has the same cone angle as the nozzle insert.
9. A valve according to claim 8 wherein the inner edge of the conical part of the inner tube has a diameter greater than the diameter of the opening.
10. A valve according to claim 9 wherein the inner shape of the conical part of the inner tube is rounded towards the inner edge.
11. A valve according to any preceding claim wherein the valve seat is part of a flat valve with a diaphragm mounted flat on a raised valve seat collar.
12. A valve according to claim 11 wherein the top edge of the valve seat which is towards the diaphragm is rounded.
13. A through-flow valve constructed and arranged substantially as herein described and shown in the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (13)

**WARNING** start of CLMS field may overlap end of DESC **. cavitation phenomena are avoided, while on the other hand the valve is suitable for controlling boiling water, because even deposits of lime cannot have such harmful effects as in known valves, due to the avoidance of cavitation, while even should lime deposits form, they can do so only at places where they have little or no effect on the rate of flow. The valve of the invention also has the advantage that the inner tube 11 can be made very thin and from a suitable material. Therefore whenever the valve is put into use or its use is discontinued, this inner tube 11 is subject to considerable temperature fluctuations which, by virtue of heat expansion, means that deposits of lime, should any have been formed, can break off again. Therefore, the valve is particularly suitable for controlling flow of boiling water. Also the construction of the valve closure member as a taut rubber diaphragm 2 counteracts the segregation of lime on the valve seat, because, when actuated, the diaphragm is subject to elastic deformation which automatically removes lime deposit. WHAT WE CLAIM IS:

1. A through-flow valve for a liquid at a temperature near its boiling point, comprising a valve closure member co-operating with a valve seat to provide an opening which constitutes the area of smallest crosssection of the valve for passage of the liquid, wherein at least one vent aperture is disposed downstream of and immediately adjacent the opening.

2. A valve according to claim 1 wherein the vent aperture is an annular gap.

3. A valve according to claim 2 wherein the annular gap is subject to ambient pressure which reaches it via an annular chamber.

4. A valve according to claim 3 wherein the annular gap and the annular chamber are formed between a nozzle insert carrying the valve seat and an inner tube in the nozzle.

5. A valve according to claim 4 wherein the nozzle insert, starting from the opening, has a conically outwardly widening part.

6. A valve according to claim 4 or claim 5 wherein the top edge of the nozzle insert is the valve seat.

7. A valve according to any of claims 4 to 6 wherein the end of the inner tube close to the valve seat also has a conical part.

8. A valve according to claim 7 wherein the conical part of the inner tube has the same cone angle as the nozzle insert.

9. A valve according to claim 8 wherein the inner edge of the conical part of the inner tube has a diameter greater than the diameter of the opening.

10. A valve according to claim 9 wherein the inner shape of the conical part of the inner tube is rounded towards the inner edge.

11. A valve according to any preceding claim wherein the valve seat is part of a flat valve with a diaphragm mounted flat on a raised valve seat collar.

12. A valve according to claim 11 wherein the top edge of the valve seat which is towards the diaphragm is rounded.

13. A through-flow valve constructed and arranged substantially as herein described and shown in the accompanying drawing.

GB1093678A
1978-03-20
1978-03-20
Through-flow valve

Expired

GB1581501A
(en)

Priority Applications (1)

Application Number
Priority Date
Filing Date
Title

GB1093678A

GB1581501A
(en)

1978-03-20
1978-03-20
Through-flow valve

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

GB1093678A

GB1581501A
(en)

1978-03-20
1978-03-20
Through-flow valve

Publications (1)

Publication Number
Publication Date

GB1581501A
true

GB1581501A
(en)

1980-12-17

Family
ID=9977032
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB1093678A
Expired

GB1581501A
(en)

1978-03-20
1978-03-20
Through-flow valve

Country Status (1)

Country
Link

GB
(1)

GB1581501A
(en)

1978

1978-03-20
GB
GB1093678A
patent/GB1581501A/en
not_active
Expired

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