US2711252A

US2711252A - Dosing means for liquid systems

Info

Publication number: US2711252A
Application number: US213407A
Authority: US
Inventors: Chauncey B Oliver
Original assignee: TESTED APPLIANCE Co
Current assignee: TESTED APPLIANCE Co
Priority date: 1951-03-01
Filing date: 1951-03-01
Publication date: 1955-06-21
Anticipated expiration: 1972-06-21

Description

June 21, 1955 c. B. OLIVER DOSING MEANS FOR LIQUID SYSTEMS Filed March 1 1951 2 Sheets-Sheet l A? vs June 21, 1955 C. B. OLIVER DOSING MEANS FOR LIQUID SYSTEMS Filed March 1. 1951 -2 Sheets-Sheet 2 INVENTOR. LkzZwZCq flOZa e;

BY Maw/PW United States Patent 2,711,252 DOSING MEANS FOR LIQUID SYSTEMS Chauncey B. Oliver, Blue Diamond, Nev., assignor to Tested Appliance Company, Chicago, 111., a corporation of Nevada Application March 1, 1951, Serial No. 213,407 22 Claims. (Cl. 210-31) This invention relates broadly to liquid supply systems requiring periodic dosages of a treating liquid, and it relates more particularly to improvements and innovations in apparatus for dosing a liquid supply or distribution system with a treating liquid in response to a release or reduction in pressure on the liquid in the supply system, such apparatus being characterized by its positive and automatic type of operation and the absence of valves, check valves and moving parts.

One particular application of the present invention is to water supply or distribution systems which include a pressure supply tank or receptacle wherein air pressure in or communicating with the receptacle serves to force the water through the system. The apparatus of the present invention is designed to dose such a water supply or distribution system with a solution of chlorine or other treating liquid when the pressure on the water drops or is released prior to refilling the receptacle.

While for purposes of illustration and a specific disclosure the invention will be described in connection with water supply or distribution systems which. requires periodic dosing with chlorine solution, it will be understood that the invention is broadly applicable to any liquid supply or distribution system wherein the liquid to be distributed or supplied requires periodic dosing with a treating liquid of some type.

The dosing apparatus of the present invention has been applied successfullyto the water systems of railway passenger cars. This particular type full advantage of certain unique features of the dosing apparatus. The fact that the dosing apparatus of my invention may be made of a rugged and simple construction and completely independent of any moving parts makes it particularly useful in connection with the water system of a railroad car where the requirements are exacting in respect to ruggedness, low maintenance, long periods between refillings and dependability in performance. such a water distribution system is that the dosing apparatus therefor be of an automatically operating type so that each time the water supply tank of the railroad car is refilled by existing crews following established procedures and schedules,-the proper dosage of chlorine solution will be introduced. One of the unique features of the present invention is that the dosage apparatus provided thereby may be installed on existingv liquid supply or distribution systems tion in the existing setup.

An important object of the invention is a dosing apparatus for introducing doses of a treating liquid into a liquid distribution system, which apparatus includes a closed container for holding a supply of the treating liquid, a closed dosage, chamber disposed in gravity feed communication with the container, and means providing direct communication between the top of the dosage chamber and the top of the supply container. A

Another important object of the invention is'a dosing apparatus for introducing doses of one liquid into a liquid of installation takes 7 long-life, simplicity,

Another requirement of without requiring altera- ,v

. 2 I supply or distribution system in response to release or reduction in the pressure maintained on the liquid within said supply or distribution system. 7

Another important object of the invention'is an automatically operating dosage apparatus which is free of moving parts and which functions automatically to introduce a dose of a treating liquid into a liquid supply or distribution tank or system in response to a ditferential or reduction in gas pressure maintained on the liquid in such a tank or system. I

'A more specific object of the invention is an apparatus for closing a water supply or distribution syste'm with a dose of chlorine solution or other liquid in response to variation or drop in'the pressure of an air pressure head which serves to move the water through the system. 7 v

Still another object of the invention is a dosing apparatus which does not require any moving part and which may be connected with the compressed air pressure chamber of a water system, with the dosing apparatus operating automatically to charge a dose of chlorine or other solution into the water system in response to a drop or reduction in pressure, and more particularly in response to release and re-establishment of the air pressure coincidental with the refilling of a water supply tank.

Certain other objects of the invention will, in part, be obvious and will, in part, appear hereinafter.

For a more complete understanding of the nature and scope of the invention, reference may now be had to the following detailed description thereof taken in connection with the accompanying drawings, wherein: v I

Fig. 1 contains a vertical sectional view through dosing apparatus forming one embodiment of the invention and shows the embodiment interconnected with a water distribution or supply system shown in'elevation except where broken away;

Fig. 2 is a vertical sectional view through a dosage devicewhich forms another embodiment of the invention; and

Figs. 3 and 4 are diagrammatic views showing two additional embodiments of the invention.

In Fig. l a water supply tank or receptacle is indicated at 5 for supplying water to a distribution system which is indicated generally at 6. The system 6 is supplied from the receptacle 5 by a main or header 7 which leads from the bottom of the receptacle. As one specific illustration, the receptacle 5 may be the water supply tank on a railroad passenger car while the distribution system 6 may represent the water supply system of the car. It will be understood that the water system of a railroad passenger car has been mentioned merely as being illustrative and that the invention is applicable to water or other liquid systems broadly wherein there is a supply tank which is maintained under pressure which varies or is released, periodically.-

In addition to the outlet connectionior the main 7, the receptacle 5 is provided at the top with three" additional connections. One of these connections is. indicated at 3 and this is th water feed orsupply connection. The bottom end of this connection 8 projects into the receptacle 5 and terminates at the high water level which is indicated at ll}. This arrangement insures the reservation of a freeboard or pressure lieadspace 11 in the top of the receptacle 5 each time it is filled up. The water supply line 8 is provided with a suitable valve '12 for closing and opening the line. v

Air pressure is supplied to the receptacle 5 through line 13 which is provided with a valve 14 and a pressure regulator 15. with water, it is necessary to shut ofifthe air pressure and to vent the pressure maintained therein. Accord- In order. to refill the receptacle 5' are closed and the vent valve 1'7 is open.

ingly, a vent line 16 is provided for this purpose having a valve 17.

A device for dosing the receptacle with a chlorine or other solution is indicated generally at 29 and constitutes one embodiment of the present invention. It will be understood that in an actual installation the recep- A dosage chamber or cup 27 having an indented and interiorly threaded neck 28 is screwed onto the mouth of the container 21 so that the diaphragm 23 is sealed between the rim or lip of the bottle mouth and a horizontal flange 30.

The dosage chamber 27 is provided adjacent the bottom thereof with an outlet opening or passageway 31 for receiving one end of a pipe or tube 32, the other end of which is connected through a union 34 to the top of the receptacle 5 as shown so as to open into the pressure head space 11.

The operation of the dosing device 26 is as follows, assuming that the device 2% is to be connected to the receptacle 5 which is filled with water to level 10. .The

valves

12 and 14 in the water and air lines, respectively,

The container or bottle 21 will be turned right. side up and filled with a chlorine solution of proper strength, the filling being stopped short of full capacity so that when the bottle 21 is inverted as shown in Fig. l, a freeboard space or pressure head 33 will be left at the top of the bottle. The dosage chamber 27 carrying tube 32 is screwed onto the neck 22 and the bottle 2% is turned over and the union 34 is connected. It will be noted that the capacity of the dosage chamber is many times smaller than the container or bottle 21.

In order to put water throughout the system 6, the vent valve 17 is closed and the valve 14 in the air pressure line 13 is opened. The pressure builds up in the gas space 11 and since the pressure in the gas space 33 in the'container 21 was at atmospheric pressure, air under pressure in the head space 11 is transmitted through the line 32 into the dosage chamber 27 and rises through opening 25 and the riser pipe 26 blowing any liquid therein ahead of it. A fraction of the chlorine solution and air introduced under pressure into the dosage chamber 27 may pass through the smaller outlet opening 24 and this arrangement serves to clear this opening should any foreign or obstructing material become lodged therein. The pressure within the gas space 33 will increase along with the pressure in the gas space 11 until equilibrium is reached. The solution blown out of the dosage compartment 27 will leave an air bubble in the top of this chamber and this air bubble will be released through the riser pipe 26 and replaced with solution passing down through the small communicating hole '24 by gravity. In a short time after equilibrium is reached, the dosage compartment 27 and riser pipe 26 will be filled with the chlorine solution up to the chlorine liquid level which defines the bottom of the gas space 33.

The pressure on the gas space 11 is maintained by the pressure regulator 15 as the water is withdrawn to the consuming system 6 through the main 7. In the water system of a railroad car the pressure in the head space may, for example, be set at 25 pounds per square inch gauge, but is often found set at pressures ranging from 5 to 30 psig. The pressure may fluctuate somewhat on both sides of the set operating value.

When it is desired to refill the receptacle 5, the air pressure line valve 14 is closed and the vent line valve 17 V is opened so as to release the pressure in the freeboard space 11. When this pressure is released there will of necessity also be a release of the pressure in the gas space 33 in the dosing unit 20. This pressure will exert itself downwardly through the riser 26 and will force the chlorine solution in this pipe together with the solu- I I Q I tion in the dosage chamber 27 ahead of it out through i the conduit 32 into the main water tank 5. In other words, the chlorine solution in the riser 26 and the dosage chamber 27 acts as a piston until the level drops to the point where the outlet opening 31 in the dosage chamber 27 is exposed, at which point the air pressure will be released rapidly after the pipe 32 has been cleared of solu-- 7 tion which is in it. In this Way the receptacle 5 is dosed with chlorine solution each time the pressure thereon is released preparatory to refilling. The dosage of chlorine solution will consist primarily of that contained in the dosage chamber 27. In addition, there will be the solution which stands in the riser 26 and in the vertical leg of the pipe connection 32. However, the internal bores or these parts are small so that the amount of solution therein is relatively insignificant in relation to the volume which is contained in the dosage chamber 27.

Since the passage 24 is small in relation to ing 25, only a small amount of the solution will be forced through this passage or duct when the pressure is-released.

After the receptacle 5 has been vented and the dosing 7 device 26 has operated, the receptacle is refilled through 1 the supply line 8 and then pressure is re-established by 5 7 closing the vent 17 and opening the valve 14. Upon the j re-application of pressure, the pressure will-again. build up in the gas space 33 as described above so as tobe available for blowing another dose 'of the chlorine solution into the receptacle 5 upon the subsequent release of the pressure therein.

It will be seen that the dosing while the receptacle 5 is under pressure, a shut-off valve may be placed in line 32. The container 21 normally'f The system described in connection with Fig. l ope r-r device 20 operates automatically without the necessity of any moving part. If it is desired to provide for refilling the dosing device 20 ates on a variation in pressure in the water system between atmospheric and some superatmospheric pressure suchas; I

30 p. s. i. g. It will be appreciated, however, that the:

dosing device 20 will operate in a similar manner by reason of a drop or variation between any other set of pressures. For example, the dosing device 24 could be used in connection with the water system of acountry home. Such water systemsusually include a storagetank and an automatically controlled pump which operates to draw water from a well and maintain a supply of water in l the tank under a pressure ranging between, say, from 30; r

to 50 p. s. i. g. It will be apparent that thedosing device 20 may beused in connection with such a receptacle so as to dose the tank with a charge of chlorine solution or.

other liquid dosing material every cycle when the pressure I 1 drops from the maximum. to the minimum.

In Fig. 2 of the drawings a closing device is indicated generally at 35 which forms another embodiment of the inl vention in which the dosage chamber is disposed within the supply container for the-dosing liquid. The dosing device shown in Fig. 2 is therefore especially suited for rough handlingand adverse operating conditions such as those encountered in connection with railway passenger cars. I

The dosing device 35 operates on the same principle as does the dosing device 20 although it does incorporate certain features not incorporated in the dosing device 20.

The dosing device 35 comprises a container 36 having a top'37. The top 37 is provided with an opening 38 which is internally threaded for receiving a filling plug40 which, is removed when thecontainer 36- is to -be filled; Directly beneath the filling opening 38 a short filling tube 41 is provided which is secured to the underside of the top 37 and serves to limit the height to which the container 36 may be filled with treating liquidsuch as a chlorine solution. This insures the reservation of a freeboard space or gas pressure space 42.

The top 37 is provided with a central opening which is internally threaded and indicated at 43. This threaded opening serves to receive a plug 44 which is provided with a central bore 45, the upper end of which is internally threaded for receipt of a nipple member 46 and the bottom end of which is threaded for receipt of the upper end of a tube 47. A lock nut 48 serves to lock the tube 47 in any desired position in the plug 44;

The tube 47 extends down adjacent to the bottom of the container 36 andthe lower end thereof is threaded so as to pass through the threaded opening 50 in the top wall of a dosing or measuring cup or chamber 51. A lock nut 52 serves to lock the tube 47 with-respect to the cup 51. Thebottom end of the tube 47 should extend down adjacent the bottom of the cup 51 and the exact position may be altered and adjusted by releasing the

lock nuts

48 and 52 and screwing the tube 47 in the desireddirection to either raise itor lower it. If desired, only the lock nut 52 may be loosened and the cup 51 may be turned 011 the bottom end of the tube 47 to obtain the desired adjustment.

The dosage chamber 51 is provided adjacent the bottom thereof with a small, filling or inlet hole 53, the diameter of which is small in comparison with the internal bore of a riser or vent tube 54. The vent tube 54 is secured at its bottom end into the top wall of the dosage chamber 51 and projects up into the gas space or chamber 42 to a point adjacent the underside of the top 37.

The nipple 46 may be connected to one end of the tube 55 by means of a union or coupling member 56. The tube 55 may lead to the pressure space in the top of. a water supply tank such, for example, as the tank in Fig. 1. For a purpose to beexplained more fully below, the tube 47 is preferably provided with a small diameter vent hole 57 at some in the container 36.

In putting the dosing device in operation, the filling plug 40 is removed and chlorine solution or other dosing liquid is introduced through the opening 38 until the level reaches the bottom of the filling tube 41. The plug 40 is then replaced and the tube 55 is connected with the gas space of a water system such, for example, as the supply tank of arailway passenger car. Whenthe pressure is built up into the water system supply tank, the pressure will communicate through the tube 55 down through the tube 47 and into the measuring cup 51 and then up through. the riser tube 54 into the" space 42. Much of the liquid in the cup 51 will beblown up through the riser tube 54 and a very small amount will be diffused through the small diameter hole 53 thereby clearing this hole of any particles should they become lodged therein. The pressure will build up in the head space 42 until it is equal tothe pressure appliedto the supply system to which the tube 55 is connected.

During average pressure fluctuation in the supply system such, for example, as in the gas space 11 of. the receptacle 5 in Fig. 1, there may be a tendency for the dosing device to charge some of the solution in the measuring cup 51 over into the main supply tank. The vent .57 allows the pressure withinthe gas space 42 to become equalized with the pressure as it fluctuates in the gas space in the main receptacle and this prevents partial dosing during relatively slow fluctuations in pressure. When the pressure in the water system supply tank is reduced quickly, such as when it is released or vented for refilling, then the pressure in the gas space 42 in the dosingdevice 35 acts to empty the chlorine solution in the measuring; cup 51 and discharge it into the: system.

point above the high liquid level .1. However, in this system That is, the pressure in the, gas. spacev 42 empties the liquid trappedin, the riser 54,. and inth'e tube 47 as;.We'l1 as the liquid in the measuring cup 51' down to a'level even with the bottom end ofithe tube 47. This measured dosage is blown out through the tubing 55- over into the main system. The internal bores of the riser 54 and the tube 47 are so small compared with the capacity of the measuring cup 51 that the variation in the liquid trapped in these tubes as the liquid level in the container 36 drops is not significant. The opening 57 is small enough-so that little pressure is lost through it when there-is a rapid release of pressure.

Itwill be understood that the'dosing device 35 will the bottom of the tube 47 is brought to the bottom of the measuring cup 51 the greater-will be the amount-of the contents of the cup which are discharged, and conversely the higher the bottom of the tube 47' is raised from the bottom of the cup the smaller will'bethe-amount of the contents which are discharged. In addition to this means of adjustment in the dose delivered, the measuring, cup 51 may be replaced with another measuring cup of different size if desired.

By these means it is readily understood that a set calibrated dosage can be provided.

The embodiments of the invention described in connection with Figs. 1 and 2 makeuse of the; same duct or conduit means for discharge of the: dose of treating liquid from the dosage chamber and for introduction of gas intothe dosing device for establishing a pressure in the gas space in the top of the dosing devices; By providing. a separate or independent connection leading into the gas space in the dosing devices, they may be utilized in connection with receptacleszwhich are. adapted to be completely filled with liquid on refilling and in connection with liquid systems operating entirely under aliquid pressure head Without air pressure being used at all;

In Fig. 3 of the drawings the dosing device 20 is shown inv connection with a water distribution" system which includes a storage tank 60 adapted to supply a distribution system 61 through a header or main 62 leading: from the bottom of the receptacle 60. The receptacle 60 is provided with a vent line 63 having a shut-off valve 64; a water feed line 65 provided with a shut-01f valve 66; and an air line 67. The dosage chamber 27 of thedosing. device 20 is connected to the receptacle 60' through aconduit 68. In order to independently introduce air pressure into the gas space in the top of the'treating liquid container 21, ,a li-ne'70 is connected therewith which extends from the air pressure line- 67. Theline 70' is provided with a check valve 71.

The air line67 is provided with a shut-ofi valvev 72 and a regulating valve 73. The operation of the dosing device 20 in connection with the receptacle 60 is broadly the same as that described above in connectionlwith- Fig. the receptacle 60- is adapted to be completely filled by introduction ofwater through the line 65 with the valve, 72 being closed and the vent valve 64 open. After being-thus completely refilled, the vent valve 64 is closedand thewater inlet valve 66 isalso closed and the air valve 72 is opened. In order to insure that no' water backs up in the line 67 when the receptacle 60 is being refilled, an additional shut-01f valve 74 maybe provided in the air line 67 With the valves 72and 74 open, the air pressure builds up through the check valve 71 andbuilds up to the desired pressure in the gas space 33 in the container 21 so as to become: in equilibrium with.- the air pressureapplied to the contents of the receptacle 60. When the receptacle 60 is ready for refilling, the pressure which is built up therein is vented by opening the vent valve 64, whereupon the pressure in the gas space 33 serves to charge a dose of the treating liquid contained in the dosage chamber 27 into the receptacle 60 in the manner described above in connection with Fig. l.

In Fig. 4 of the drawings the dosing device 20 is shown interconnected with a liquid system represented by the conduit 76, this system being operated entirely by liquid pressure instead of gas pressure. The dosage chamber 27 is connected to the system 76 through a line 77, this line having a section 7 8 which extends above the highest liquid level reached in the container 21. The raised or elevated portion 78 is provided as a precaution to prevent siphoning of the contents of the dosing device 29 under certain conditions. The gas space 33 is provided with a connection 80 leading to a source or supply of air pressure and the line 80 is provided with a solenoid type valve 81. In normal operation the pressure in the gas space 33 will be in equilibrium with the pressure on the liquid in the system 76. When it is desired to charge a dose of the treating liquid into the system 76, the solenoid valve 81 is operated and air pressure is-applied in the gas space 33 which is sufiiciently in excess of the pressure in the system 76 so as to cause a dose of the treating liquid in the chamber 27 to be discharged through the line 77 into the system 76. The valve 81 is closed as soon as the dose has been discharged and the pressure equilibrium in the gas space 33 and the system 76 is again established. As a matter of convenience, the solenoid 81 may be provided with a timer type switch so as to admit the air pressure for a required amount of time, for example ten seconds and then to shut it OK again.

It will be apparent that certain changes may be made in the two embodiments of the invention which have been described, and that additional embodiments of the invention may be made without departing from the spirit and scope of the invention. Accordingly, all matter described above or shown in the accompanying drawings is intended to be interpreted as illustrative and not in a limiting sense.

What I claim as new is: V

'1. Apparatus for dosing a fluid system with a treating liquid comprising, a closed container for holding a relatively large supply of a treating liquid, a dosage chamber of small capacity relative to said container located in gravity feed communication with said container, a small duct or passageway providing communication between the interior of said dosage chamber and the bottom of said container so as to allow liquid to run therethrough from the container into said chamber and fill the latter, conduit means providing direct communication between the top of said dosage chamber and the top of said container, and a dosage discharge conduit means connectedwith said dosage chamber below the top thereof.

2. Apparatus for charging doses of a treating liquid into the gas space for a liquid supply receptacle and operatable in response to an increase and decrease in gas pressure within said receptacle, comprising, a container for a treating liquid and having a gas space in the top thereof, a dosage chamber of small capacity relative to said container located in gravity feed communication with said container, a small duct or passageway providing communication between the interior of said dosage chamber and the bottom of said container so as to allow liquid to run therethrough from the container into said chamber to fill the latter, means providing direct communication between the top of the dosage chamber and said gas space of said container, and means providing communication between the bottom of said dosage chamber and the gas space of said receptacle.

3. Apparatus for charging doses of a treating liquid into the gas space of a liquid supply receptacle and operatable in response to an increase or decrease in gas pressure within said, receptacle, comprising, a relatively large closed container for a treating liquid, means for filling said container so as to leave a gas space inthe top portion thereof, a relatively small closed dosage chamber located adjacent the bottom of said container,

said dosage chamber having a small liquid inlet opening therein which communicates with said closed container and a relatively larger opening in the wall of said chamber adjacent the top thereof, means providing direct com munication between said larger hole and said gas space in the top portion of said container, and means providing communication between the bottom portion of said chamber and said gas space of the liquid supply recep-- tacle.

4. Apparatus for charging doses of a treating liquid 'into the gas pressure space of a liquid supply receptacle and operatable in response to an increase or decrease in gas pressure within said receptacle, comprising, a closed container for a'treating liquid, means for filling said container so as to leave a gas space in the top portion thereof, a closed dosage chamber located adjacent the bottom of said container, said dosage chamber having a small liquid inlet opening therein which communicates with said closed container and a relatively larger.

opening in the wall of said chamber adjacent the top thereof, means providing direct communication between said larger hole and said gas space in the top of said container, and a tube projecting'through a hole pro-- vided therefor in the top of said chamber with the lower end terminating adjacent the bottom of said chamber and I the upper end of this tube communicating with a passageway through said container, and means providing com munication between this tube and the gas space of said receptacle.

5. Apparatus for charging doses of a treating liquid" into the gas pressure space of a liquid supply receptacle and operatable in response to an increase or decrease in pressure within said receptacle, comprising, a closedcontainer for a treating liquid, means for filling said con tainer so as to leave a gas space in the top portion thereof,

a closed dosage chamber located adjacent the bottom "of i said container, said dosage chamber having a small liquid inlet opening therein which communicates with said 1 closed container anda relatively larger opening in the wall of said chamber adjacent the top thereof, means providing direct communication between said larger hole" I and said gas space in the top of said container, and a tube projecting through a hole provided therefor in the top of said chamber to adjust the distance between the bottom of the tube and the bottom of the said chamber, and means providing communication between the'tube and the gas space of said receptacle.

6. Apparatus for dosing a liquid storage distribution system with a treating liquid in response to variation of pressures in said system, comprising, a closed container for holding a relatively large supply of a treating liquid, 1 means for filling said container 'so' that there willrbea gas space left above the filled liquid level, a dosage"? f chamber for holding a relatively small amount of the treating liquid located in gravity feed communication with the liquid space of said container, a small duct or passageway providing communication between the interior of said dosage chamber and the bottom of said container so as to allow liquid to run therethrough from the" container into said chamber to fill the latter, means providing direct communication between the top of the dosage chamber and said gas space of said container, and q an outlet adapted to provide communication between the bottom of said dosage chamber and a gas space'in liquid storage system. s

7. Apparatus for dosing a liquid storage distribution system with a treating liquid in response to variation in pressures in said system, comprising, a closed container for holding a treating liquid, means for filling said con-' tainer so that there will be a gas space left above the filled liquid level, a dosage chamber located in gravity feed communication withthe-liquid space of said container, means providing communication between the top of the dosage chamber and gas space of said container, and tubular means providing communication between a gas space in the liquid storage distribution system and said dosage chamber wherein an end of this tubular means terminates within said chamber and is adjustable to vary its distance from the bottom of said chamber.

8. Apparatus for dosing a liquidstorage distribution system with a treating liquid in response to variation of pressures in said system, comprising, a closed container for holding a treating liquid,.means for filling said con-' tainer so that there will be a gas spaceleft above the filled liquid level, a dosage chamber located in gravity feed communication with the liquid space of said container, means providing communication between the top of the dosage chamber. and gas space of said container, and tubular means providing communication. between the bottom of said: dosage chamber and a gas space in liquid storage system, wherein there is a very small by-pass from this tubular means intothe gas space of the closed container.

9. Apparatus for charging doses of a treating. liquid into a liquid supply reception normally maintained under pressure and operable in response to a reduction in pressure within said tank, comprising, a supply container for a treating liquid, a dosage chamber of small capacity relative to said supply container located in gravity feed relationship therewith, a duct or passageway providing communication between the bottom of said. supply container and said dosage chamber, a tube communicating between the top of said dosage chamber and the top of said supply container, and a duct or passageway communicating with the bottom portion of said dosage chamber and adapted to be connected in communication with the top of said receptacle.

10. Apparatus for automatically dosing a liquid storage receptacle with a treating liquid each time the pressure in said receptacle is sufi'iciently lower than a pressure within said apparatus, comprising, a closed outer container for holding a supply of the treating liquid, a closed dosage chamber located within and adjacent the bottom of said container, said dosage chamber having a small liquid inlet opening which communicates with said closed container and a relatively larger opening in the wall of said chamber adjacent the top thereof, a riser tube fitting said larger opening and extending upwardly in said outer container to a point adjacent the top thereof, and duct means communicating with the bottom portion of said dosage chamber and adapted to be connected in communication with a pressure head space in the top of said receptacle.

11. Apparatus for automatically dosing a receptacle with a treating liquid in response to a differential in pressure, comprising, a closed outer container for holding a supply of the treating liquid, a closed dosage chamber disposed within and adjacent the bottom of said container, said dosage chamber having a small liquid inlet opening therein which communicates with said closed container and a relatively larger opening in the top wall of said chamber, a riser tube fitting said larger top opening and extending upwardly in said outer container to a point adjacent the top thereof, and a tube projecting through a hole provided therefor in the top of said chamber with the lower end terminating adjacent the bottom of said chamber and the upper end of said second tube communicating with a passageway through the top of said outer container.

12. Apparatus for automatically dosing a receptacle with a treating liquid each time the pressure in said tank is reduced, comprising, a closed outer container for holding a supply of the treating liquid, the top wall of said container having a filling opening closed by a removable closure member, a filling tube extending from the: bottom of said filling; opening down".into tsaidt'coina tainer so ask; limit the height to which: said: container can be filled through said. opening, a closed. dosage chamber disposed withinand adjacent'the bottom of. said container for holding a dose ofthe treating liquid, said dosage chamber having' a smal'l-sizedli'quid: inlet opening. in the side wall thereof, a pair of. larger op'eningsin the top wall of said chamber, a vertical riser tube fitting into one of said larger holes and extending up to a level above the bottom end of said filling. tube, and a vertical tube projecting through the second of said larger openings in the chamber with: the bottom end terminating adjacent the bottom of said chamber and'with' the upper end communicating'with a passageway extending through the top Wall of. said. closed container.

13. The dosing apparatuscalle'd for in claim 11 wherein the bottom end of 'said last mentioned vertical tube-and the bottom of said dosage chamber are adjustable relative to each other. p

14. The closing apparatus called for in claim ll wherein said top wall of said closed outer container is' provided with a second opening and a plug is fitted in said opening through which said dosage chamber maybe inserted and removed, said plug having a passageway extending therethrough and into which is fitted the upper end. of said second mentionedvertical tube.

15. The closing apparatus called for in claim 11 where'- in said second mentioned vertical tube is exteriorly threaded at its opposite ends so that thebottome'nd screws" into one of said larger holes in the" top wall of 'said dosage chamber and theupper end screws into said pas= sageway through the top wall ofsaid container, and lock nuts are threaded on the opposite ends of said second mentioned vertical tube so as to lockit from turning relative to said chamber and said container.

16. The apparatus called for in claim 11 wherein said second mentioned vertical tube has a relatively small pressure equalizing opening in the side at a level above the bottom end of said filling tube whereby the pressure within the head equalized with pressure fluctuations within the head space of a liquid storage tank to which said passageway in the top of said closed container may be connected.

17. Apparatus for automatically dosing a treating liquid into a receptacle each ,time the pressure in said receptacle is reduced, comprising, an inverted container, a dosage chamber fitting on the downwardly opening neck of said inverted container, a diaphragm closing the mouth of said container and having a small opening therein and a relatively larger opening therein, and a riser tube fitting over said larger opening and extending upwardly adjacent the top or" the inverted container, said dosage chamber having a passageway in the wall thereof adjacent the bottom and adapted to be connected in communication with the pressure head space at the top of a liquid storage tank.

18. In combination with a liquid storage receptacle having a pressure head space reserved in the top thereof when said receptacle is filled, an apparatus for automatically dosing said receptacle with a treating liquid each time the pressure therein is reduced a sufiicient amount comprising, a closed supply container for treating liquid, a closed dosage chamber disposed in gravity feed relationship with said closed container, a small duct or passageway providing communication between the interior of said chamber and the bottom of said container so as to allow liquid to run therethrough from the container into said chamber to fill the latter, a relatively large conduit providing communication between the top of said chamber and the top of said closed container, and a conduit providing communication between the bottom of said chamber and the head space in said storage tank.

19. In combination with a liquid storage receptacle provided with means for creating, maintaining and respace of said closedcontainer will be leasing pressure in a head space reserved therein when filled; an apparatus for automatically dosing said receptacle with a treating liquid Comprising, a closed outer container for holding a supply of treating liquid, a closed dosage chamber located within and adjacent the bottom of said closed container, said dosage chamber having a small liquid inlet opening in the wall thereof and a relatively larger opening in the top thereof, a riser tube fitting in said larger opening and projecting up to adjacent the top of said closed container, and a conduit communicating between the bottom of said chamber and the head space of said storage tank.

20. In combination with a water storage tank provided with means for creating, maintaining and releasing air pressure in a head space reserved in said tank Whenfilled, an apparatus for automatically dosing said tank with chlorine solution each time the pressure in said tank is vented, comprising, a closedsupply container for treating liquid, a closed dosage chamber disposed in gravity feed relationship with said closed container, a small duct or passageway providing communication between the interior of said chamber and the bottom of said container so as to allow liquid to run therethrough from the container into said chamber to fill the latter, a relatively large conduit providing communication between the top of said chamber and the top of said closed container, and a conduit providing communication between the bottom of said chamber and the head space in said storage tank.

21. In combination with a water storage tank provided with means for creating, maintaining and releasing air pressure in a head space reserved in said tank when filled with water, an apparatus for automatically dosing said tank with chlorine solution each time the pressure in said tank is vented, comprising, a closed outer con- 12 tainer for holding a supply'of chlorine solution, a closed dosage chamber located within and adjacent the bottom of said closed container, said dosage chamber having a small liquid inlet opening in the wall thereof and a relatively larger opening in the top thereof, a riser tube fitting in said larger opening and projecting up to adjacent the top of' said closed container, and a conduit communicating between the bottom of said chamber and the head space of said storage tank.

22.' Apparatus for charging doses of a treating liquid i into a liquid supply tank normally maintained under pressure and operable in response to a reduction in pressure within said tank, comprising, a supply container for a treating liquid, a dosage chamber of small capacity relative to said supply container located in gravity feed relationship therewith, a small duct or passageway communicating between said supply container and said dosage chamber, a tube of relatively large size compared to said small duct or passageway and comunicating between the top of said dosage chamber and the top of said supply container, and a duct or passageway comunicating with the bottom portion of said dosage chamber and adapted to be connected in communication with the top of said tank.

Pontones June 12, 1951