GB2382863A - Float valve - Google Patents

Float valve Download PDF

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Publication number
GB2382863A
GB2382863A GB0224011A GB0224011A GB2382863A GB 2382863 A GB2382863 A GB 2382863A GB 0224011 A GB0224011 A GB 0224011A GB 0224011 A GB0224011 A GB 0224011A GB 2382863 A GB2382863 A GB 2382863A
Authority
GB
United Kingdom
Prior art keywords
water
valve
level
inlet
tank
Prior art date
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.)
Withdrawn
Application number
GB0224011A
Other versions
GB0224011D0 (en
Inventor
Michael Thomas Binder
Original Assignee
Michael Thomas Binder
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.)
Filing date
Publication date
Priority to GB0124706A priority Critical patent/GB0124706D0/en
Application filed by Michael Thomas Binder filed Critical Michael Thomas Binder
Publication of GB0224011D0 publication Critical patent/GB0224011D0/en
Publication of GB2382863A publication Critical patent/GB2382863A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00Actuating devices; Operating means; Releasing devices
    • F16K31/12Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/18Actuating devices; Operating means; Releasing devices actuated by fluid actuated by a float
    • F16K31/20Actuating devices; Operating means; Releasing devices actuated by fluid actuated by a float actuating a lift valve
    • F16K31/22Actuating devices; Operating means; Releasing devices actuated by fluid actuated by a float actuating a lift valve with the float rigidly connected to the valve

Abstract

A valve device (20) for fitting to a water tank (10) includes telescopically arranged inner (30) and outer tubes (50). An inlet of the inner tube (30) is fitted around a water inlet aperture of the tank (10) and the end of the outer tube (50) remote therefrom is closed such that water may enter the tank (10) through the two tubes (30)in respective opposite directions and so as to generally enter an existing body of water in the tank (10) below the level of that body. The valve device (20) includes floating means (60) with a ball (80) connected thereto. The floating means (60) is operable to rise with the level of water in the tank and to elevate the ball (80) accordingly and until, at a predetermined position, the ball (80) is seated against structure of the inner tube (30) so as to stop water from entering the tank (10). The float may have a skirt (not shown) to assist in forcing the ball off its seat when the water level falls.

Description

<Desc/Clms Page number 1>

"Valve Device" This invention relates to valve devices for water storage tanks and cisterns.

Water storage tanks or cisterns usually include a conventional ballcock valve arrangement to maintain water therein substantially at a pre-determined level.

A disadvantage of conventional ballcock valve arrangements is that the entry of water into a tank thereby tends to be noisy.

It is an object of embodiments of this invention to address this problem.

According to an aspect of this invention there is provided a valve device for maintaining a body of water in a tank substantially at a pre-determined level, the device including water inlet means arranged for fitting around a water inlet aperture of the tank, and further arranged, during operation, to convey water from the inlet aperture to the body of water so as to enter that body from below the waterline thereof, the device also including valve means arranged and operable to stop the flow of water through the water inlet means when the body of water reaches the pre-determined level within the tank.

By ensuring that water entering the tank is introduced into the body of water

<Desc/Clms Page number 2>

therein at a point below the waterline of that body, the noise caused by the water entering the tank is minimised.

Preferably the water inlet means is arranged such that an outlet thereof is situated below the water level of the body of water, substantially throughout operation. The outlet of the water inlet means may be moveable during operation, relative to an inlet of the water inlet means, that inlet being adjacent the inlet aperture of the tank during operation. Preferably the flow of water from the outlet of the water inlet means is such that it is not towards the surface of the body of water. This is advantageous in preventing water from the outlet of the water inlet means from breaking the surface of the body of water and creating noise. Preferably the flow of water from the outlet of the water inlet means is directed substantially downwards by the water inlet means.

The water inlet means may include at least two telescopically arranged tubes.

Preferably the tubes are arranged such that, in operation, water flows through each tube in a direction substantially opposite to that in which it flows through the respective other tube. An inner one of the tubes may include the inlet at a first end thereof and the outer tube may be closed at an end thereof that is furthermost from the inlet aperture, such that water flows through the inner and the outer tubes in respective opposite directions and the outlet of the water inlet

<Desc/Clms Page number 3>

means is constituted by an annular space between the other end of the outer tube and the external surface of the inner tube.

The valve means may be operable permit the flow of water through the water inlet means when the level of the body of water falls below the pre-determined level within the tank. Preferably the valve means includes a stopper operable by floating means to stop and un-stop the flow of water through the water inlet means. The stopper may be connected to a float of the floating means, so that the stopper rises and falls in accordance with the water level in the tank and between a position in which the flow of water is not stopped, when the body of water is at a level below the predetermined level, and a position in which the flow of water is stopped, when the body of water is substantially at the pre-determined level. The stopper may be operable to seat against an aperture of the water inlet means so as to close that aperture and thereby to stop the flow of water therethrough. Preferably, the stopper is arranged to seat against structure of the inner tube that defines an outlet aperture of that inner tube, that aperture being at the other end of the inner tube to the inlet aperture.

The float means may be attached to the outer tube such that the outer tube rises and falls with the float means and hence with the level of the body of water in the tank. This is advantageous in that should the level of the body of water fall,

<Desc/Clms Page number 4>

<img class="EMIRef" id="024168867-00040001" />

the float means and hence the outer tube also fall, thereby maintaining the outlet of the water inlet means below the level of the body of water and ensuring that water entering the tank does so at a point below that level so that the noise thereof is minimised.

The water inlets means may include stopper unseating means including a surface arranged such that a partial vacuum is created between the surface of the body of water in the tank when the level of the body of water falls below the predetermined level.

This is advantageous in unseating the stopper from the position in which the flow of water is stopped.

The surface may be arranged to form a skirt having an area that is arranged to rest on or in the body of water in the tank during use. The skirt may further include a peripheral lip that projects downwards from the skirt. The skirt may include an airhole therein, arranged such that it is large enough to allow air therethrough to allow the surface of the body of water to rise inside the skirt, and such that it is small enough that the partial vacuum us created, at least temporarily when the level of the body of water falls below the predetermined position.

<Desc/Clms Page number 5>

The skirt may be positioned adjacent an underside of the float.

According to another aspect of this invention there is provided a valve device for maintaining a body of water in a tank substantially at a pre-determined level, the device including water inlet means arranged for fitting around a water inlet aperture of the tank so as to be operable to convey water from the inlet aperture to the body of water, wherein the water inlet means includes a <img class="EMIRef" id="024168867-00050001" />

valve seat, and the valve device includes a stop positioned on the inlet aperture side of the seat, the stop being connected to floating means and arranged to seat against the seat when the level of water in the tank reaches the predetermined level, thereby stopping the flow of water through the inlet means, and arranged to be unseated when the level of water falls below the predetermined level, thereby permitting the flow of water through the inlet means.

Positioning the stop on the inlet aperture side of the seat is advantageous in that pressure of the water on that side of the seat acts against the stop to press it against the seat, thereby maximising sealing between the stop and the seat.

Thus, water pressure of the inlet water acts with the float means to stop the flow thereof. This can be contrasted with a conventional ballcock valve arrangement wherein a stop is pressed against a seat in opposition to a flow of

<Desc/Clms Page number 6>

inlet water. Furthermore, should grit, or somesuch other foreign matter, become lodged between the stop and the seat of the present arrangement so as to reduce the sealing therebetween, the grit will tend to be dislodged by the flow of inlet water when the stop is next unseated. The stop may be unseated manually by depressing the float means.

Optional features of the first aspect of this invention may also be optional features of the other aspect of this invention.

A specific valve device in which the invention is embodied is now described by way of example only and with reference to the accompanying drawings, in which: Figure 1 is a part-sectional view of the valve device fitted to a water tank, the valve device being in an open position; and Figure 2 is a similar part-sectional view to that of Figure 1, but with the valve device in a closed position.

Figure 1 shows a part of a base 12 of a water tank 10 in cross section. The water tank 10 is of the type that may be used domestically for the storage of

<Desc/Clms Page number 7>

<img class="EMIRef" id="024168867-00070001" />

water in an attic or loft, or as a cistern for the storage of water above a toilet.

The tank 10 has an inlet aperture 14 formed in its base 12.

Figure 1 also shows a valve device 20. The valve device 20 includes an inner inlet tube 30 surrounded by an outer portion 40. The inlet inner tube 30, which is substantially cylindrical and formed from plastic, includes a flange surface 32 that projects laterally outwards from a mid portion of the inner tube 30. One end of the inner tube 30 includes a screw thread 34 formed on the outer surface thereof. The valve device 20 is arranged in the tank 10 such that the end of the inner tube 30 that includes the screw thread 34 projects downwards, through the inlet aperture 14 in the base 12 of the tank 10. The flange surface 32 of the inner tube 30 rests on the structure of the tank 10 immediately surrounding the aperture 14. A threaded lock ring 36 is cooperatively engaged with the screw thread 34 formed in the inner tube 30 and tightly screwed against the underside of the base 12 of the tank 10. Together, the flange surface 32 and the lock ring 36 tightly clamp the structure of the of the tank 10 immediately surrounding the aperture 14 and create a seal between the flange surface 32 and the base 12 of the tank 10.

The other end of the inner tube 30 that is not threaded and that is uppermost is partially closed by an annular end wall 38. The annular end wall defines a

<Desc/Clms Page number 8>

circular aperture 39 at the uppermost end of the inner tube 30. A radially and axially innermost surface 38A of the end wall 38 is curved so as to be a part- spherical valve seat.

The outer portion 40 includes an outer tube 50, an outer wall 60 and a rod 70. The outer tube 50 is a cylindrical tube with an end wall at one end, in which is formed a small co-axial hole 52. The outer tube 50 is situated around the inner tube 30, with its substantially closed end uppermost and so that an annular space 55 exists between the outside of the inner tube 30 and the inside of the inner tube 50.

The outer wall 60 surrounds an uppermost portion and end of the outer tube 50 so as to form a substantially cylindrical enclosure therearound, which is separated from the outer tube 50 by a cavity, or chamber 65. The top of the outer wall 60 has a threaded hole 62 formed therein that is co-axial with the hole 52 formed in the top of the outer tube 50. The outer tube 50 and the outer wall 60 are integrally formed of plastic.

The rod 70 is also formed of plastic. One end of the rod 70 includes a threaded portion 72 and a knob 74. The threaded portion 72 is engaged in the threaded hole 62 formed in the top of the outer wall 60. The knob 74 is positioned

<Desc/Clms Page number 9>

above the threaded portion 72 so as to be above the hole 62 formed in the outer wall 60. The remainder of the rod 70 depends from the hole 62 in the outer wall 60, through the hole 52 in the top of the outer tube 50 and into the inner tube 30. The rod 70 includes a stop 76 that is positioned on the rod 70 so as to be above the outer tube 50 and inside the outer wall 60. The stop 76 is larger in diameter than is the hole 52 in the top of the outer tube 50. The lower end of the rod 70 has a ball 80 attached thereto. The ball 80 is smaller in diameter than the inside of the inner tube 30, but larger in diameter than the aperture 39 in the uppermost end of the inner tube 30.

An initial filling operation is now described with reference to Figure 1. The lower end of the inner tube 30 is connected to a supply of pressurised water.

Water 90 from that supply rises through the inner tube 30. The water 90 passes through the aperture 39 in the uppermost end of the inner tube 30 and into the annular space 55 between the outside of the inner tube 30 and the inside of the outer tube 50. The water 90 flows downwards through this annular space 55 until it passes the lowermost end of the outer tube 50, whereupon the water 90 exits the valve device 20 and enters the tank 10. Thus, the portion of the annular space 55 that is between the lowermost end of the outer tube 50 and the outside of the inner tube 30 constitutes an outlet of the valve device 10.

<Desc/Clms Page number 10>

Prior to the initial filling operation, there is no existing body of water in the tank 10 and therefore water entering the tank tends to make a noise. Once the level of the water 90 in the tank has risen above the lowermost end of the outer tube 50, additional water 90 entering the tank through the valve device 90 is introduced into the existing body of water in the tank 10 below the water line of that body of water 90. The existing body of water acts to reduce the noise caused by the additional water 90 entering the tank 10. Thus after the initial fill operation has been completed, the noise of additional water 90 entering the tank 10 is suppressed.

Water 90 continues to enter the tank 10 in this way so that the level of the body of water 90 in the tank 10 rises. When the level has risen so as to be part-way up the outside of the outer wall 60, the substantially enclosed and air-filled chamber 65 acts as a float and causes the outer portion 40 (which, as stated, includes the outer tube 50, the outer wall 60 and the rod 70) to rise as well. Thus, as the level of the water 90 rises, the rod 70 and the ball 80 at the lower end thereof rise up the inner tube 30. This continues until, as shown in Figure 2, the water 90 has reached a level in the tank 10 at which the ball 80 is seated against and abuts the curved surface 38A of the annular end wall 38 at the uppermost end of the inner tube 30. This acts to create a seal between the annular end wall 38 and ball 80, thus stopping the aperture 39 through which

<Desc/Clms Page number 11>

the water 90 would otherwise flow and thereby enter the tank 10. The curvature of the curved surface 38A matches that of the surface of the ball 80.

This results in a large area of contact between the ball 80 and the curved surface 38A, and hence in good sealing between the two.

The body of water 90 in the tank 10 remains at this level until water leaves the tank 10 to supply a consumer demand, such as the opening of a tap or the flushing of a toilet. As water 90 leaves the tank 10, the level of water 90 falls.

This causes the outer portion 40 of the valve device 20 to fall under its own weight, which in turn unseats the ball 80 from its sealing contact with the annular end wall 38 and opens the aperture 39 to the pressurised water 90 in the inner tube 30. Water 90 flows into the tank 10 as described above until the level of the body of water 90 in the tank again reaches the level at which the aperture 39 is stopped by the ball 80.

It will be appreciated that, all other things remaining equal, the level of the body of water 90 in the tank 10 at which the aperture 39 is stopped will depend on the length of the rod 70. Rotating the knob 74 that projects from the top of the outer wall 60 causes the rod 70 to be moved up and down with respect to the outer tube 50 and the outer wall 60 by means of the threaded portion 72 of the rod 70 cooperating with the threaded hole 62 in which it is

<Desc/Clms Page number 12>

located. In this way, the length of the rod 70 can, in effect, be increased and reduced, thereby setting the maximum level that the body of water 90 may attain in the tank 10.

In some embodiments, it is envisaged that the initial filling operation would be a once only operation, performed after the valve device 20 has been fitted to the tank 10. In normal use, it is envisaged that the level of a body of water in the tank would not fall below a certain residual level. This level would be above the lowermost end of the outer tube 50 so that the noise of additional water 90 entering the body of water 90 is suppressed, even when the level of that body is at the residual level. It is envisaged that the level of the body of water in the tank 10 could be maintained at or above such a residual level by positioning a lowermost outlet pipe (not shown) of the tank 10 at this residual level.

Figure 3 shows another valve device 120 fitted to another water tank 110, similar to the tank 10 described previously with reference to Figures 1 and 2.

Many of the features of the other valve device 120 are substantially the same as those of the valve device 20 described with reference to Figures 1 and 2.

For conciseness, the same reference numerals will be used for those features and the previous description thereof will not be repeated.

<Desc/Clms Page number 13>

The other device 120 differs principally in that there is no outer wall 60 surrounding the outer tube 50 to create a chamber 65 therebetween that acts as a float. Instead, a float 165 is provided at the uppermost end of the outer tube 50. The float 165 is substantially toroidal, but with a substantially rectangular cross section so as to have cylindrical inner and outer surfaces and planar, annular, upper and lower surfaces. The upper surface of the float 165 has attached thereto structure 166 that projects from a radially innermost area thereof to form a threaded aperture 166A concentric with and positioned above the cylindrical inner surface of the float 165.

The float 165, together with the skirt thereof 167, is attached to the uppermost end of the outer tube 50 by attaching the skirt 167 of the float 165 thereto. The attachment is such that the float 165 and the skirt 167 are concentric with the outer tube 50. The attachment between the skirt 167 and the outer tube 50 is air-tight.

The ball 80 and the rod 70 described previously with reference to Figures 1 and 2 are retained in this other valve device 120. However, the rod 70 is without the stop 76 and has substituted therefor a screwdriver-receiving slot 176 in the uppermost end of the rod 70. An uppermost length of the rod 70 is received in the threaded aperture 166A of the float 165, the threaded aperture

<Desc/Clms Page number 14>

166A being formed so as to cooperate with the threaded portion 72 (not shown in Figure 2) of the rod 70. The remainder of the rod 70, with the ball 80 on the lowermost end thereof, depends from the float 165 in a manner similar to the arrangement described above with reference to Figures 1 and 2.

Operation of the other valve device 120 is similar to that of the first-described valve device 20 : a rising water level in the tank 110 causes the float 165 to be raised, which in turn raises the rod 70 and the ball 80 until the water level is such that the ball 80 becomes seated against the inner tube 30; a falling water level causes the float to fall, which in turn unseats the ball 80, allowing further water to enter the tank 110. However, the skirt 167 has an effect on this operation. As the water rises up the outer tube 50 and reaches the peripheral lip of the skirt 167, an annular pocket of air is created between the skirt 165 and the outer tube 50. As the water level rises further, air is expelled from this pocket through the airhole 169 such that the level of water reaches, and perhaps rises above the planar, annular, surface of the skirt 167. As the level of water continues to rise, the float 165 rises with that level until the ball 80 is seated as described above. So far, the skirt 167 has had no substantial effect on operation. However, as the water level drops below the level of the planar, annular, surface of the skirt 167, a partial vacuum is created between that surface and the water therebelow. Thus, a downwardly-directed force is exerted

<Desc/Clms Page number 15>

on the skirt 167 by the water. This force is transmitted via the float 165 and the rod 70 to the ball 80 and assists in unseating the ball 80, which otherwise may have a tendency to remain seated. Although the partial vacuum will tend to draw air through the airhole 169 such that its pressure increases to atmospheric pressure, it is envisaged that the airhole 169 is sufficiently small such that this increase in pressure takes place over a time period sufficient to give rise to forced unseating of the ball 80.

The position of the ball 80 with respect to the float 165 can be adjusted by rotating one of these components relative to the other. This is most easily carried out be inserting the head of the screwdriver in the screwdriver-receiving slot 170, holding the float 165 and rotating the screwdriver and hence the rod 170 relative to the float 165.

Claims (19)

1. A valve device for maintaining a body of water in a tank substantially at a pre-determined level, the device including water inlet means arranged for fitting around a water inlet aperture of the tank, and further arranged, during operation, to convey water from the inlet aperture to the body of water so as to enter that body from below the waterline thereof, the device also including valve means arranged and operable to stop the flow of water through the water inlet means when the body of water reaches the pre-determined level within the tank.
2. A valve device according to claim 1, wherein the water inlet means is arranged such that an outlet thereof is situated below the water level of the body of water substantially throughout operation.
3. A valve device according to any preceding claim, wherein the water inlet means is arranged such that the flow of water from the outlet thereof is not towards the surface of the body of water.
4. A valve device according to claim 3, wherein the water inlet means is arranged such that the flow of water from the outlet thereof is directed
<Desc/Clms Page number 17>
<img class="EMIRef" id="024168868-00170001" />
substantially downwards by the water inlet means.
5. A valve device according to any preceding claim, wherein the water inlet means includes at least two telescopically arranged tubes, the tubes being arranged such that, in operation, water flows through each tube in a direction substantially opposite to that in which it flows through the respective other tube.
6. A valve device according to claim 5, wherein an inner one of the tubes includes an inlet at a first end thereof, adjacent the inlet aperture, and the outer tube is closed at an end thereof that is furthermost from the inlet, such that water flows through the inner and the outer tubes in respective opposite directions and the outlet of the water inlet means is at least partly constituted by a space between the other end of the outer tube and the external surface of the inner tube.
7. A valve device according to any preceding claim, wherein the valve means is arranged and operable to permit the flow of water through the water inlet means when the level of the body of water falls below the pre-determined level within the tank.
<Desc/Clms Page number 18>
8. A valve device according to any preceding claim, wherein the valve means includes a stopper operable by floating means to stop and un-stop the flow of water through the water inlet means.
9. A valve device according to claim 8, wherein the stopper is connected to a float of the floating means, so that the stopper rises and falls in accordance with the water level in the tank and between a position in which the flow of water through the water inlet means is not stopped by the stopper when the body of water is at a level below the predetermined level, and a position in which the flow of water is stopped by the stopper when the body of water is substantially at the pre-determined level.
10. A valve device according to claim 8 or claim 9, wherein the stopper is operable to seat against an aperture of the water inlet means so as to close that aperture and thereby to stop the flow of water therethrough.
11. A valve device according to claim 10, wherein the stopper is arranged to seat against structure of the inner tube that defines an outlet aperture of that inner tube, that aperture being at the other end of the inner tube to the inlet thereof.
<Desc/Clms Page number 19>
12. A valve device according to any one of claim 8 to claim 11, wherein the floating means is attached to the outer tube such that the outer tube rises and falls with the floating means and hence with the level of the body of water in the tank.
13. A valve device according to any preceding claim and further including stopper-unseating means having a surface arranged such that a partial vacuum is created between that surface and the surface of the body of water in the tank when the level of the body of water falls below the predetermined level, the stopper-unseating means being connected to the stopper, and the arrangement being such that the partial vacuum acts on the stopper unseating means to unseat the stopper when the level of the body of water so falls.
14. A valve device according to claim 13, wherein the surface of the stopper unseating mans is arranged to form a skirt having an area that is arranged to rest on or in the body of water in the tank during use.
15. A valve device according to claim 14, wherein the skirt includes a peripheral lip that projects downwards from the skirt.
16. A valve device according to claim 14 or claim 15, wherein the skirt
<Desc/Clms Page number 20>
includes an airhole therein, arranged such that it is large enough to allow air to be expelled therethrough such that the surface of the body of water can rise inside the skirt; and such that it is small enough that a partial vacuum is created of sufficient magnitude and duration to unseat the stopper when the level of the body of water falls below the predetermined position.
17. A valve device for maintaining a body of water in a tank substantially at a pre-determined level, the device including water inlet means arranged for fitting around a water inlet aperture of the tank so as to be operable to convey water from the inlet aperture to the body of water, wherein the water inlet means includes a valve seat, and the valve device includes a stop positioned on the inlet aperture side of the seat, the stop being connected to floating means and arranged to seat against the seat when the level of water in the tank reaches the predetermined level, thereby stopping the flow of water through the inlet means, and arranged to be unseated when the level of water falls below the predetermined level, thereby permitting the flow of water through the inlet means.
18. A valve device according to claim 17 and including the further feature or features of any one of claim 2 to claim 16.
<Desc/Clms Page number 21>
19. A valve device substantially as described hereinbefore with reference to the accompanying drawings and/or as shown in Figure 3, or in Figure 1 and Figure 2 of those drawings.
GB0224011A 2001-10-15 2002-10-15 Float valve Withdrawn GB2382863A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0124706A GB0124706D0 (en) 2001-10-15 2001-10-15 Valve device

Publications (2)

Publication Number Publication Date
GB0224011D0 GB0224011D0 (en) 2002-11-27
GB2382863A true GB2382863A (en) 2003-06-11

Family

ID=9923846

Family Applications (2)

Application Number Title Priority Date Filing Date
GB0124706A Ceased GB0124706D0 (en) 2001-10-15 2001-10-15 Valve device
GB0224011A Withdrawn GB2382863A (en) 2001-10-15 2002-10-15 Float valve

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB0124706A Ceased GB0124706D0 (en) 2001-10-15 2001-10-15 Valve device

Country Status (1)

Country Link
GB (2) GB0124706D0 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1016370A3 (en) * 2005-01-06 2006-09-05 Dotraco Nv Brine valve, has brine inlet located below level of passage extending between inlet and outlet
WO2007123890A1 (en) * 2006-04-17 2007-11-01 Allegiance Corporation Autofeed mechanism for heated humidifier chamber

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2415875A (en) * 1943-09-13 1947-02-18 Arthur A Greenwald Flushing tank inlet valve
US3230970A (en) * 1962-11-09 1966-01-25 Head & Johnson Flush control valve
US3559675A (en) * 1969-03-20 1971-02-02 Adolf Schoepe Fluid flow passage and valve assembly for ball cocks
GB1494065A (en) * 1975-03-25 1977-12-07 Robbins R Water closet valve assembly

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2415875A (en) * 1943-09-13 1947-02-18 Arthur A Greenwald Flushing tank inlet valve
US3230970A (en) * 1962-11-09 1966-01-25 Head & Johnson Flush control valve
US3559675A (en) * 1969-03-20 1971-02-02 Adolf Schoepe Fluid flow passage and valve assembly for ball cocks
GB1494065A (en) * 1975-03-25 1977-12-07 Robbins R Water closet valve assembly

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1016370A3 (en) * 2005-01-06 2006-09-05 Dotraco Nv Brine valve, has brine inlet located below level of passage extending between inlet and outlet
WO2007123890A1 (en) * 2006-04-17 2007-11-01 Allegiance Corporation Autofeed mechanism for heated humidifier chamber
US8033292B2 (en) 2006-04-17 2011-10-11 Carefusion 2200, Inc. Heated humidified chamber with autofeed mechanism

Also Published As

Publication number Publication date
GB0224011D0 (en) 2002-11-27
GB0124706D0 (en) 2001-12-05

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)