CA2175903A1 - Automatic shut-off valve arrangement - Google Patents

Automatic shut-off valve arrangement

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Publication number
CA2175903A1
CA2175903A1 CA 2175903 CA2175903A CA2175903A1 CA 2175903 A1 CA2175903 A1 CA 2175903A1 CA 2175903 CA2175903 CA 2175903 CA 2175903 A CA2175903 A CA 2175903A CA 2175903 A1 CA2175903 A1 CA 2175903A1
Authority
CA
Canada
Prior art keywords
valve
fluid
inlet
chamber
arrangement
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.)
Abandoned
Application number
CA 2175903
Other languages
French (fr)
Inventor
Stanley Robert Elsdon
Gordon Elford Fairles
Arthur S. Cornford
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.)
Emco Wheaton Corp
Original Assignee
Individual
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 claimed from CA002102569A external-priority patent/CA2102569A1/en
Priority claimed from US08/334,205 external-priority patent/US5813432A/en
Application filed by Individual filed Critical Individual
Priority to CA 2175903 priority Critical patent/CA2175903A1/en
Publication of CA2175903A1 publication Critical patent/CA2175903A1/en
Abandoned legal-status Critical Current

Links

Abstract

This invention relates to an automatic shut-off valve arrangement (1) for use in fluid transfer systems. In particular, the valve arrangement or assembly may be mounted in a fluid tank or other type of fluid containment zone to automatically shut off flow from a source, when the desired volume of fill is reached. The assembly is for use in automatic or semi-automatic fluid handling systems which include specialized nozzles and coupling systems which eliminate spillage in the process of connection and disconnection of the nozzle and the tank inlet. An automatic shut-off valve arrangement (1) for use in fluid transfer operations which comprises air inlet (11) and an outlet (13), means for securing the arrangement to a fluid container such that incoming fluid passes through the arrangement when entering the container, the inlet being opened and closed in response to application of external mechanical opening means and or incoming fluid pressure, and the outlet being normally closed but opened in response to fluid flow through the arrangement to the container, level sensor flow control means actuated in response to fluid in the tank reaching a predetermined level, and connected to a bleed passage (66) provided with flow restricting means, and arranged to be in communication with incoming fluid and with operating means (38) of a main valve (41) located in a main valve chamber (40) such that fluid back pressure from the level sensor flow control means acts upon the operating means of the main valve to close the main valve and the main chamber such that fluid is no longer delivered to the fluid container and the valve assembly is shut off.

Description

WO 9S/12545 2 ~ 7 5 q 0 3 PCT/CA94/0061S
AUTOMATIC S~l'-OFF VALVE ARRANGEMENT
FIELD OF THE INVENTION
This invention relates to an automatic shut-off valve ~ for use in fluid transfer systems. In particular, the valve Al 1. y~ or assembly may be S mounted m a fluid tarlk or other type of fluid, zone to ~-lt~ rir:lliy shut off flow from a source, when the desired volume of fill is reached. The assembly is for use in automatic or semi . fluid handling systems which include specialized nozzles and coupling systems which eliminate spillage m the process of connection and ' of the nozzle and the tank inlet.

The systems in which the present invention are employed may be generally .1...,., r.. ;~. J as fluid transfer systems in which fluids are transferred from one zone of ~.. l-;..,....,~ to another and in which means are required for stopping the flow lm~ir:llly when the fluid m the du~ uc~ zone reaches some lu.
15 level.
Typically, such systems are used for I . r~ f ~ fuel from a storage vessel to a vehicle. In the more ,..~ J systems of this type, fuel is pumped from the storage vessel, through a flexible hose, to a nozzle which can be positively andremovably connected in a leak proof fashion to the inlet of a fuel tarlk on the vehicle.
20 Such systems are intended to prevent leakage of the transferred fuel to the cllv;lu..l.l.llL by providing a pressure tight connection between the parts during operation, and by erlsuring that the internal mterface between the nozzle and the tanic iniet are effectively sealed before the noz~le can be i;~.. ~1 thus providing a coupling with the purpose of . ' _ spillage of fuel in the process of connectionZ5 and ~' of the two An ancillary benefit of such systems is the prevention of theft or I
diversion of fuel since flow is prevented unless the nozzle is properly cormected to a mating vehicle tank inlet.
Automatic shut-off valves have been ill~Ul,UI ' ' in such systems, but 30 typically these are found in the nozzle. The valve is activated either by sensing a build-up of pressure in the vehicle tank, or by the blockage of air flow under suction from the vehicle tank back to the nozzle. There are a number of inherent disadvantages to such I-~-i L..~ as follows.
1. Sensitive . . . - ~ are required to sense the low level changes m 3~ pressure, or suction, in an otherwise rugged ~ ilUIIIII.~IIL.

W095112545 PCT/CA94100615 o ~1 75903 2. Frequent lubrication and other preventive is required to keep the internal ~ effectively ù~. ' 3 . Wear on the nozzle c ~ is a function of the frequency of use.
When large fleets of vehicles and/or frequent refuelling operations are involved, 5 increased -lA;llt~ .. ~ can become both a nuisance and a cost factor.
4. The operator can manually control the rate of flOw which is not an efficient method of refuelling a vehicle.
The present invention seeks to address these problems m a number of ways.
SUMMARY OF THE INVENTION
In the present invention, an automatic shut-off valve assembly is located insidea vehicle tank or other zone of ...,.l~i,. l..,1 to give the following benefits.1. Since there is a valve on each vehicle or zone of .. ,.l~;.. 1 the frequency of use of each valve is reduced by some very c~".-: l. .,.1,1~ factor.2. Because the valve is within tne protective vl~vi~u~ L of the tarlk or zone 15 of: - t, it is less liable to suffer damage from rough or careless usage.
3. The ~ v of the assembly makes t~mpering virtually im 4. The vU~ ~Uv~iUII of the shut-off valve is such that lubrication is U~ aly. This feature, together with a greatly reduced frequency of operation eliminates the need for routine . ,~ P of the valve.
5. Activation of the shut-off valve to stop or prevent flow is brought about by level sensor flow control means which preferably is ruggedly .,u..,L.u.,tvd, and most preferably is a simple float mechanism which is not affected by variations of pressure within the tank or zone of ~
6. The activation of the valve is a function of fluid pressure and flow rate 25 through the valve, and fluid level in the tank or zone of ~,. No m.-rh mir~l resetting or triggering is required. The valve is either fully opened or closed.7. Changing the location of the shut-off valve from the nozzle to "tank-side"
means that the nozzle can be cul~;uv~lvly simplified and reduced in weight.
8. To r ' unusual vehicle geometry, a vehicle fuel inlet can be 30 located some distance remotely from the vehicle tank.
9. The proposed structure is casy to ~ ur~-,lul~ and install, the latter requiring no unusual skills or expertise.
In addition to the above a.lv v . the mountmg of the shut-off valve in the fuel tank inlet as described, allows the device the capability of handling a potentially 35 wide range of fuel flows and delivery pressure from more than one fuelling station.
For example, delivery pressures could typically range from 20-60 Ibs./sq. m. while -~ WO 95112545 2 1 7 5 9 0 3 PCT/CA94~00615 flow rates could typically range from 15-60 gal./mm. While it appears unlikely that the highest flow rate would coincide with the lowest delivery pressure, it is desrrable tbat such a condition could be - ' ' The present invention provides an automatic shut-off valve ~ for S use in fuel transfer operations which comprises an inlet and an outlet. Means are provided for secmring the assembly within the container such that incoming fluidpasses through it when entering the container. The - .. c,. "~ l inlet is opened and closed in response to application of external mechanical opening means and/or incommg fluid pressure, and the outlet is normally closed but is opened in response to 10 fluid flow through the ", . ". .~ The level sensor flow control mearls may comprise an ancillary float actuated valve or a pilot valve or other valve means which is actuated in response to fluid in the tank reaching a ~I~A. l..,..;.- ~i level. A bleed passage is provided with flow restricting means in the valve A.,,.r~" .. l and is arranged to be in ~.--",. l -';.~.. with the incoming fluid, and with the level sensor 15 flow control means from which fluid back pressure is tr~ mittP~I The bleed passage is also in ~ .. .. ;~ -l ;. ~l. with a main valve having operating means that is located in a main valve chamber such that fluid back pressure from the bleed passage acts upon the operatmg means of the main valve. In this fashion, the main valve is closed as is the main chamber, such that fluid may no longer be delivered to the tank or zone of 20 C~---'-;-..-.~ l and the valve ~ ....l is shut off.
In a preferred form, the Al~ is a valve assembly, in which there may be provided an inlet chamber and an associated inlet valve, which controls flow to the inlet chamber, a main chamber and an associated main valve piston operating means, wbich controls flow to the outlet chamber from the main chamber, and an outlet 25 chamber and an associated outlet valve. In this case, the bleed passage comprises a flow restriction section in c. with the inlet chambe}, and being in ......... ~,- ~;~.. with a volume chamber associated with the piston operating means of the main valve.
Operation of the assembly is such that a portion of the incoming fluid passes 30 into the bleed passage when fluid flows tbrough the assembly into the container, and out to the level serlsor flow control means, which is open when fluid in the tank or zone of .. ~l-i.. l~ is low. When the level of fluid in the container reaches a . .",;nr.1 level, the level sensor flow control means closes the valve and fluidback pressure through the bleed passage forces fluid through to the volume chamber 35 of the piston operating means of the main valve, whereupon the main valve closes as the piston is displaced and fluid flow to the outlet chamber and the tank or zone of .. ~-i....,...: is stopped and the valv~ assembly shuts off, preventing fluid flOw into 21 75qU3 the assembly and the container.
It should be noted that when the level sensor flow control means is open, pressure in the du... end of the bleed passage is cllhCt~ntiAIIy lower than the valve inlet pressure. When the static pressure in the piston volume chamber is 5 A~UII 'y equal to the valve inlet pressure, the differential area across the piston causes it to be displaced to close the main valve.
While this description focuses on installation of the Al I A 1~ in a fuel tank of a vehicle, it should be understood that the Al ~ or assembly may be installed in a stationary fuel storage tank for a diesel engme, for example. Such 10 II-~ri-nc would be the type used for irrigation pumps and for emergency generators For hospitals and the like. The vehicles may be Ll~ Ju~ iull vehicles of all types such as buses, trucks, A.l~l...IA",. and the like, as well as off road vehicles used in C.U...~lUUIiUII and mining, for example, earth movers and open-pit and Lllld~ lUUlld mining vehicles. Railway equipment and marine vessels may also 15 employ the A 11 A- 1~,. ' 1'- ' ~ or assembly of this invention. The A I A I IL,~ or assembly may also be used in any system where fluid is transferred and automatic or semi-automatic shut off of fluid flow is required.
In a preferred form of this invention, the automatic shut-off valve assembly is installed in a fuel tank, and the assembly comprises an inlet and an outlet. Means for 20 securing the assembly within the fuel tank are provided, as are means for commecting the assembly to level sensor flow control means located in the fuel tank which serves to activate the valve assembly to shut it off; the valve assembly has an inlet chamber and an associated inlet valve, a main chamber and an associated main valve with operating means, an outlet chamber and an associated outlet valve, and the valve~5 assembly is accessible from the tank inlet. The inlet valve is opened and closed in respon~e to the application or removal of external mechanical opening means and/or pressure of incomrng fluid, and the inlet chamber ~ with a bleed passage in the valve assembly. The passage is provided with flow restricting means. The operating means of the main valve is in ~""..,...",. ~i..., with the bleed passage, and 30 the main valve is normally open to permit fluid flow to the main chamber from the inlet chamber, and moves to its closed position in response to fluid back pressure on the operating means from the bleed passage. The outlet valve is normally closed, but opens in response to fluid pressure from the main chamber. The flow path tbroughthe valve is such that during fuelling, the valves are open and permit flow into the 35 ~tank, and some flow occurs through the bleed passage to the level sensor flow control means, which is open when the fuel level is low, and fuel flows into the fuel tank.
When the level sensor flow control means closes, upon the tank being filled to a ~ WO 9SI12545 2 1 7 5 9 0 3 PCT/CA94/00615 ,Ult-'~ i-- d level, back pressure in the bleed passage causes an increase of pressure in the volume chamber which causes the main valve to close and to stop fluid flow into the outlet chamber, whereupon pressure on the outlet valve ceases and the outlet valve closes. As no pressure drop then exists across the inlet valve, in the absence of any external m-~rh~ ir~l opening mearls, the valve closes.
In the preferred ' ' the level sensor flow control mearls is usually comnected to the end of the bleed tube by means of a flexible tube, although other forms of comnection means could be employed. The tube may be made from any suitable material which is flexible and fuel resistant.
The level sensor flow control means, and hence the preferred the float actuated valve assembly may be a separate unit from the shut-off valve. It is possible to illCul~l ' the valve within the automatic shut-off valve assembly and to place the sensor means or float remotely or separately therefrom. It is preferably mountedclose to the top of a vehicle tank, although other suitable t~ will be 15 apparent to those skilled in the art.
The preferred means level sensor flow control consists of two essential a valve and a float. The float may be made of cork or any other suitably buoyant material, and will be at the bottom limit of its travel as the fluid level in the tank rises, so that in its uppermost position it closes off the port in the 20 valve.
Gravity biases the float m its open position. It is also preferable not to secure the flexible tubing directly to the float but rather to a lower part of a chamber which houses the float. This seems to provide for smoother operation of the float assembly.
Usually, the float actuated valve is placed in the tank and preferably a vented 25 fuel or tank cap is secured over it. Such structures are well known in the art and many are available commercially. Examples are those caps which are sold by GT
Du~.~v~ l."lL Corporation under the trade-mark SAFEGARD. Details of suitable structures are found in the description of the preferred ~ I-o~
It will be apparent that many types of float actuated valve structures may be 30 used in uullllJi~liull with the shut-off valve assembly of this invention. The I~ Uil~ i are that the device be simple in design to simplify ..,A. r- ~ ; and to ensure reliable operation. It will also be apparent to a person skilled in the art that a variety of means may be used to sense the fluid level including pneumatic, ".. .1,~.,;. ,.1 optical, electrical, electronic, magnetic means or devices and equivalents 35 thereof.
While in the ~Illhvdiul...l6 described it is preferred that all elements of the valve assembly, namely the inlet and outlet valves, the main valve and the bleed WO 95/lZ545 PCT/C~94/00615 21 75903 ~

passage with its flow restricting Al 1~ ,,. ' ' '' are all contained within the sarne structure, it is not essential that this be the case. In its most preferred form, the assembly does comprise the three valves and the bleed passage with its flow restricting A- I....L,. ''.` '' Further, it is also preferred to locate the assembly at the 5 inlet of a fuel tank in which it is to be installed.
The location of the shut-off valve assembly in the fuel tank as opposed to itl the fuel nozzle provides the advantage that the nozzle may be reduced in weight and simplified irl design. The nozzle may now simply provide a manual shut-off valve for the ~ " ~ fuel line. Such nozle structures are known in the art. In use, the 10 assembly of this invention is best employed with a dry-break coupling which ensures that fluid loss is minimized or eliminated. Devices which meet these ~c~uihL~ tb are available c~,lllll..,lc;~lly. Typical of the type of dry-break device which may be used in ~ J- II~ 1;-1-l with the shut-off valve of the present invention is that found in U.S.
Patent No. 5,078,170 issued January 17, 199~ to Emco Wheaton, Inc., the disclosure 15 of which is hereby iII~UII)~ ' ' herein by reference. These devices are of particular importance in the fields of application of this invention given the ~ U~JIIIII.,llkll and cost concerns relating to fuel spillage.
In a most preferred form of the invention, the inlet valve is a poppet tube withpoppet guide means, the tube being biased in its normally closed position by suitable 20 means, such as a spring. The poppet guide includes ports for perrnitting fluid to pass from the inlet chamber to the guide interior which is in ~,..."" ~ ,;. -li.,.. with the bleed passage. The bleed passage is centrally located in the assembly and passes through all chambers. While it is essential that the bleed passage ^- with the main chamber, and with incoming fluid, it need not necessarily pass through the outlet 25 charnber and be centrally located in the assembly.
The flow restriction means preferably is in two concentric sections, a first section which .. ".. ;. ~-t ` with the inlet and comprises a metering tube and a metering pin which simply slows flow in the passage. The poppet guide is formed so that it also provides a housing for the piston of the main valve, which in effect, with a 30 hollow piston interior, foTms the volume chamber. This volume chAAmber is in ...,..,.." ^ ;..., with the bleed passage, but with the second section. C.-"".--,..;. Al;(.
occurs through the annular passage which is formed between the exterior of the metering tube and the cylindrical channel formed in the assembly. The second section of the passage comprises a bleed tube whose end is aligned coaxially with the 35 do~llbLIcdlll end of the metering tube, but is .l;~ laterally therefrom such that a space is formed between the two ends when a fluid back pressure situation occurs.
This back pressure forces fluid back rnto the piston volume chamber which then Wo 95/12545 PCT/CA94/00615 ~ 2 ~ 759~)3 displaces the piston amd moves the main valve to its closed position.
Alternatives to the metering pin and metering tube for controlling flow and pressure drop through the bleed passage will be apparent to the person skilled in the art. A typical choice would be a form srmilar to the ~ of a ~,u~ iullal S fluid check valve. Such valves are normally used to prevent flow in one direction while allowing free flow m the other. The active sealing member may be a ball, or any other shape such as a conical or flat faced poppet. The flow rate, and ly the pressure drop, through the device m the free flow direction is a function of spring pressure. Flow regulation will result by using a spring with a 10 suitable force IIA1~ . Flow in the reverse direction is prevented by seating of the sealing member. While this may not be necessarily 1~ lf in the present ,., I'f'~,. 1. 11 but it can be overcome by preventing the sealing member from being in full contact with its seat.
Other methods of controlling flow and pressure drop - such as an adaptation of 15 the common needle valve or even a single very small orifice - are possible. The present design has been selected, namely the combined metering pin and metering tube for two principal reasorls:
- resistance to pluggmg. At the entrance to the assembly of pin and tube, the cross section of the arlnular flow passage is effectively a narrow but wide slot in hydraulic terms. This .. ,~;,1.. ll.1~ reduces the potential for obstruction to flow by foreign objects in the fluid being handled.
- simplicity in design and 1 - --r~ . By making the flow passage between the metering pin and metering tube of sufficient length, a larger radial clearance between the two is possible (for any specified drop). This results in greater ease of ", - ,. .ri.. ~. ,. ;..~ to normal production tolerances.
In operation, the following sequence occurs, this operation being described with reference to one of the preferred forms of the invention. When the fuel tank is 30 empty or contains a small amount of fuel, the main valve is in its normally open position. The inlet poppet valve remains in its normally shut position closing the interior of the valve and the fuel tank to the outside. Residual fuel may remain in the valve body but it is at the same pressure as the fuel in the fuel tank. The ou~det poppet valve is closed precluding fluid flow from the main chamber to the outer 35 chamber. The bleed passage may contain residual fluid, but again at the same pressure as in the remainder of the valve assembly and the tank. The float valve is also open in this instance.

WO 95/12545 PCT/CA94/00615 ~
21 759~3 To start refuellrng, the fuel noz~le is connected to the inlet of the fuel tank,usually through a coupler which elirninates spillage in the process of connection and .1;~. ..11--- . 1;.,., Tbe valve of the noz~le is opened and the hydrostatic head of the supply line displaces the inlet poppet tube or the valve is manually displaced by the S tuel no~zle or other means and fluid flows under pressure mto the valve inlet through a fine mesh screen, if required. Fluid pressure in the inlet chamber forces fluid to flow into the bleed passage from the inlet chamber and travels through the bleedpassage, with the flow restriction means, into the comnecting tube to tbe float valve where the fluid flows out into the tank. Regular flow proceeds through the valve10 body with the hydrostatic pressure being sufficient to open the outlet poppet to per[nit fluid flow from the main chamber to the outlet charnber. The function of this valve is to mamtain a reasonably constant pressure differential between the interior of the shut-oflf valve assembly and the discharge to the tank. The valve is not called upon to block flow in the reverse direction and is not required to have a pressure tight seal.
15 When the fluid level in the tank rises such that the float valve is closed, flow from the bleed passage is blocked and static pressure in the passage will increase and fluid back pressure causes a build up of fluid in the bleed passage in the space between the first and second flow restriction sections, such that fluid flows through the annular clearances in the second flow restriction section back towards the volume chamber in 20 the piston, displacing the piston and closing the main valve and stopping flow from the inlet chamber to the main chamber. With flow into the tank then stopped, thepressure on the outlet valve ceases and the valve moves to its normally closed position. At this time there is also no pressure differential across the inlet valve, since flow to the tank is stopped by the main valve, and so the mlet valve may return 25 to its normally closed position, unless there is some mechanical opening means preventing it.
BRIEF DESCRIPIION OF THE DRAWINGS
Figure 1 is a Inn~ihl~in:-l cross-section of an automatic shut-off valve of the 30 present invention shown with its adapter and cap for mounting in a fuel tank inlet, the upper and lower halves of the Figure show the valve in open and closed positions, Figure 2 is a cross-section of a float valve shown mounted in a fuel tank;
Figure 3 is a cross-section of an alternative float valve shown mounted in a 35 fuel tank;
Figure 4 is an alternative, .,.1"~,1;"....: to the valve of Figure 1 shown in Inn~ih-~lin:ll cross-section;

~ WO9S/12545 2 1 7 5 9 0 3 PCT/CA94/00615 Figure 5 is a cross-section through Figure 6 along Ime 5-5, through the piston area;
Figure 6 is an enlarged I ,, ' I partial section showmg flow passages through the valve assembly shown in Figure 1;
5 Figure 7 is a 1.,.. ~ cross-section of a piston used in the valve of Figure l;
Figure 8 is a side Yiew of a piston used in the valve of Figure 1;
Figure 9 is a hransverse cross-section of an outlet poppet retainer in the valveof Figure 1;
Figure 10 is a top view of the outlet poppet retainer as shown m Figure 9;
Figure 11 is a l-- ,~ illAI section of an inlet poppet guide in the valve of Figure 1;
Figure 12 is an end view of the inlet poppet guide of Figure 11;
Figure 13 is a side view of the inlet poppet guide of Figure 12;
Figure 14 is a schematic showing a fluid hransfer assembly which includes a nozzle, a dry-break coupler, a valve assembly according to the mvention mounted in a fuel container and a float achlated valve;
Figure 15 is an alternative ~ ...1,o.1;.~.. .l of the valve assembly of the present invention, shown in ~ - li. -l cross-section;
Figure 16 is a check valve which may be used in place of a metering pin and a metering hube illustrated in the previous figures.
DESCRlPTION OF TEIE PREFERRED EMBODIMENTS
Referring now to Figure 1 of the drawings, there can be seen a Inn~ihl~ir-~l cross-section of an automatic shut-off valve assembly designated generally at 1. The 25 flow passages m valve assembly l are further illustrated in Figures 5 and 6 and reference should be made to these figures as needed throughout this dl~srrirtinn The upper and lower halves of Figure 1 illustrate the valve assembly 1 in open and closed positions, Ic~ ly, and Figure 6 shows it in an open position. The valve assembly 1 comprises a valve body 10, typically made from drawn steel ~hubing, which 30 is provided at its inlet, generally indicated at 11, for mounting the valve m a fuel tank inlet (not shown) with an inlet adapter 12 and an adapter nut 14, each usually made of - bronze. The tank inlet is closed with the valve assembly 1 which includes a dust cap 16, generally of steel provided with usual tension means, in this case spring 17, for ensuring tbat it remains securely shut when closed. Adapter nut 14 is secured to the 35 tank by means of screw threading shown at 18. Valve body 10 includes an inletchamber 20, a main chamber 22 and an outlet chamber 24. Inlet chamber 20 houses WO 95/12~45 ` PCTICA94/0061~ ~
21 1S903 lo an inlet poppet tube 26 which is normally biased, by suitable means, such as a spring 29 (usually a helical, , steel spring) as shown herein, in its closed position.
Inlet poppet tube 26 serves to close and seal the inlet 11 of the shut-off valveassembly 1 and the fuel tank (not shown) in which it is located. Inlet poppet tube 26 5 is provided with sealing means 32, which preferably comprises an annular rl: 1, ,..", ;,, seal of a material which is fuel resistant, around its end to ensure that it seats against the inlet adapter, which is shaped to receive the seal 32 to seal the inlet as required in ruch incl~ll .tjnnc The pressure in the biasing means 29, usually a spring, and in this case a 10 helical CU~ C~;U~ steel spring, is l,.~ l such that upon application of pressure via a fuelling nozle (not shown) and fuel being delivered under pressure, the poppet 26 will be displaced along its In ~ axis to permit entry of fluid into the inlet chamber 20. The fluid flow path through the valve when entering the tank is marked with arrows which bear the letter A in Figures 1 and 6. Arrows B show fluid 15 flow through bleed passage 46 and back pressure flow is shown by arrows C. When poppet tube 26 is displaced away from the inlet opening, it is guided along inlet poppet valve guide 28. The lengths of the poppet tube 26 and valve guide 28 are selected such that ports 30 located in the inlet poppet valve guide remain exposed and thus fluid may flow from inlet chamber 20 to the interior of inlet poppet valve guide 20 28, which is hollow and ~(,.. ~ .; ~ ~ with a bleed passage designated generally at 46. The inlet poppet tube 26 and inlet poppet valve guide 28 are sized such that each slides smoothly, one over the otber and necessarily; the inlet poppet tube is hollow for this purpose.
An end portion 36 of the inlet poppet valve guide acts as a piston chamber for 25 piston 38 and valve 41. It also provides an entrance for bleed tube 66. The entrance is provided by virtue of a circular aperture 46a (see Figures 11, 12 and 13) andcylindrical extension 46b thereof, which extends in the direction away from the poppet guide 28. The size of this aper~ure 46a is such that it receives a metering tube 42 which is sized to receive a metering pin 44 in a wedge-like fashion. Metering tube 30 42, pin 44 and aper~re 46a and bleed tube 66 are selected such that annular clearances are provided between one and the other in order for fluid to pass between all surfaces. The metering tube 42 and pin 44 comprise the first section oF the flow restricting means. It should be noted that a multiple number of ports 30 is provided in inlet poppet valve guide 28 to provide good and adequate fluid flow 35 into the bleed passage 46 while fluid is entering the fuel tank, as will be described in detail later. All interior valve parts are usually made of fuel resistant plastic such as materials sold under the trade-marks DELRIN and CELCON. The metering pin 44 is ~ WO 9S112S45 2 1 7 5 q ~ 3 PCT/CA94/0061S
typically stainless steel and the metering tube is usually drawn stainless steel.
The piston 38 includes a volume chamber 40 for receiving fluid from the bleed tube 66. As indicated, piston 38 is guided and retained within piston housing orchamber 36 which is formed m the end portion of inlet poppet valve guide 28. The5 piston 38 is secured to the bleed tube 66 at region 56. Main valve 41 is normally biased by means of a spring 52, which in this instance is a conical, helical , ~ spring, in an open position which permits flow of fluid from inlet chamber 20 to main chamber 22. Seals 48 are provided at upper and lower regions of the piston 38 to permit the piston 38 either to seal off the valve assembly I with 10 respect to flow between chambers 20 and æ or to move freely therein. The piston 38 includes a narrower diameter portion 38a and in this area there is provided an enlarged annular area 56 for fluid passage to the piston volume chamber 40. It is in this area or region 56 that the piston 38 is secured to bleed tube extension 64, which surrounds metering tube 42 creating a channel or annular passage 42a which leads15 into volume chamber 40. The adjacent portion of the bleed tube 66 extends to and through outlet 13 of valve body 10. Bleed tube 66 is secured to the interior of piston 38, at its left hand end, such that it is displaced therewith. A space 68 is provided between bleed tube portion 66 and the end of metering tube 42. Poppet 62 is provided with a central cylindrical bore 62a for receiving metering tube 42 and bleed 20 tube 66. Poppet 62 slides ;~ ly over bleed tube 66. When a fluid back pressure situation occurs in the bleed passage 46, fluid ~ in space 68 and as pressure increases, back pressure results in fluid building in volume chamber 40which then displaces piston 38 which closes main valve 41. Normally, outlet poppet 62 is biased, in this case by means of a spring 63, in a closed position. The function 25 of this outlet poppet 62 is to maintain a reasonably constant pressure differential between the mterior of the shut-off valve assembly and the discharge to the tank. The poppet 62 is not called upon to block flow m the reverse direction and is not required to have a pressure tight seal.
It will be noted that general valve seat 49 includes valve seat portion 50 for 30 receiving seal 48 of valve 41. The material of valve seat 49 is selected such that the inteRace between the head of poppet 62, which in this case is a conical shape forms a seal with valve seat 54.
Many float actuated valve structures are known and any design may be employed as long as it will function in the ~ t, usually a fuel tank of a 35 vehicle which must perform in all types of weather. It must be fuel resistant and must be simple for ease of .I.~.llur~.L.I.c and reliability.
Referring now to Figures 2 and 3, there are shown two alternative designs for WO 95112545 PCT/CA94/00615 ~

float actuated valves which may be used with the valve assembly. Referring first to Figure 2, there is shown generally at 100, a float actuated valve. The valve lO0 is located at a vented outlet 110 in a fuel tank 103. The valve is secured to a capassembly 101 by means of a bolt 105. The cap may also be installed by simply S bolting it to a top portion of fuel tank 103 without use of this cap assembly 101. The cap assembly 101 may be selected from any of those available I ~.;ally which provide high capacity pressure venting, bulk fluid ~.Il,U.,l~Lu-~ sensitive thermal venting and anti-spill breather venting. It will be apparent that the use of the cap assembly 101 provides ready access to the float actuated valve 100, for installation 10 amd ,. ~ . Float 102 may be made of cork or other buoyant substance which is fuel resistant, and is located in valve chamber 108 which is sized to receive the float 102 to move freely up and down in the chamber 108. Tube 109 which connectsto a bleed passage in a valve assembly as shown in Figure 1, extends through thecentre of float 102 so that when float 102 rises as a result of fuel entering bottom 15 openmg 104 in valve chamber 108, the top 107 of tube 109 contacts base 106 of the bolt 105 to seal off the bleed passage.
In Figure 3, the float actuated valve, designated generally at 200 has a very similar structure to that shown in Figure 2. Thus float 202 is housed within float chamber 208 which has side openings 204 which permit fluid to enter and move the20 float upwardly. Rather than tube 209 being directly connected to the float, a float extension 210 and float extension chamber 210a are provided, to which tube 209 is secured. Shoulders 211 of float extension 210 rest against seats 212 in the upper part of chamber 210a to seal off the bleed passage, when the float 202 rises upwardly.
Referring now to Figure 4 of the drawings, the upper half of the drawing 25 shows a shut-off valve, designated generally at 2, in open position and the lower half illustrates valve 2 in closed position.
The design of this valve is substantially the same as the shut-off valve as shown in Figure 1, with the exception that the inlet poppet 326 is of an alternative uullaLru,liull. In this uul~LIu~_Liul~, inlet poppet 326 is a solid body of cylindrical 30 shape sized to reciprocally slide within inlet poppet guide 328. Spring 329 biases the inlet poppet 326 m its closed position. The inlet end 327 of the poppet 326 is enlarged relative to its main body portion 325 to provide a closure for the valve 2 and the tank inlet (not shown) when mounted therein. The top of spring 329 rests against a nange 327a on end 327 of poppet 326. The other side of this nange 327a provides 35 a recess 332a for a seal 332. Ports 330 are provided in poppet guide 328 to allow passage of fluid from inlet channel 320 into a bleed passage designated generally at 346. Piston 338 is also of a slightly different shape at its open end and the WO95/12~54!i 2 ~ 7 ~ 9 0 3 PCTICA94100615 for locating seal 348a which is of a different shape is necessarily altered.
All other parts of the structure are the same as for the assernbly of Figure 1. In this instarlce, tbe parts have been labelled and the r~nnbers correspond except for th~ digit 3 used for the assembly of Figure 4.
S Figures 7 and 8 illustrate a ' ,, " i cross-section and a side view of piston 38 as found in valve I of Figure 1. Piston 38 is generally cylin~irical in shape and has an u~ e. d~ cavity 40 which acts as a volume chaunber during operation of the shut-off valve. Portion 38a is narrower in e~terior diameter and receive and secures bleed tnbe 66. Upper exterior flariges 48b and 48c proYide a recess for receiving an 10 annular seal 48. Anotber u.~ flange 48a is provided at a point just before the piston narrows to provide a recess for another annular seal 48 which seats piston 38 upon piston seat 50 providing a seal between chambers 20 and æ. Spring 52 rests at 52a which is the top of what could be called the neck of the piston.
Figures 9 and 10 illustrate a diametrical section through poppet outlet retainer15 70 and a top view thereof, l.,*.~Li~;y. The retainer 70 has a central aperture 72 which is sized to receive bleed tube 66 and is provided with a . ;. ,,. .. F ' ~:_1 flange 73 which provides a stop for outlet poppet 62, retaining it in place within valve body 10. Sprmg 63 rests on either side of flange 73. Apertures 71 are provided in poppet outlet retamer 70 which in this instance are tbree, and elongate in shape to allow flow 20 out of the shut-off valve assembly l into the tank (not shown). It will be apparent tbat bleed tube 66 when placed within aperture 72 provides a guide or path of travel for outlet poppet 62.
Figures 11, 12 and 13 illustrate the inlet poppet valve guide 28 found in valve 1 of Figure 1. Guide 28 is generally an ~ll e~ cylinder. Narrower portion 28a 25 is sized so that poppet inlet tube 26 slides easily back and forth thereover. Its length is such tbat tube 26 when ful)y open does not cover ports 30 which permit passage of fluid into bleed passage 46. A flanged central aperture 46a (flange 46b~ provides entrance to bleed passage 46. It is sized to receive metering tube 42 which receives metering pin 44 as previously described. Tube 42 is secured in the aperture 46a such 30 that fluid flow may not occur Ih~lel,~ . An end portion 36 of guide 28 forms piston housing or chamber 36 which is sized to slidingly engage and receive within, piston 38, which surrounds bleed tube 66. On the exterior of end portion 36 are a series of, in this case three, rectangular vanes which are sized to allow guide 28 to rest within valve body 10 so that guide 28 lies adjacent top edge 49a of general valve 35 seat 49. This structure permits flow through valve body 10 and ensures that inlet poppet guide 28 is maintained in an axially aligned position, within valve body 10.
The ends of lower portion 36 of guide 28 provide a stop for piston when it is in open 2~ 759a3 14 position.
In Figure 14 of the drawmgs, there is shown in schematic fashion an assembly for ~ r .; ~ fluids designated generally at 400. A fuel noz~le 401 of known ,. ",~l ... l i- -.. is secured to an inlet 406 of a fuel tank 408, through a dry-break coupler S 402 of known ~ ,- The dry-break coupler 402 is secured to inlet 406 after cap 407 is opened. To mlet 406, there is secured an automatic shut-off valve assembly 403 as already described. Valve assembly 403 is connected via flexible tubmg 405 to a float actuated valve 404 located at the top of fuel tank 408. In this instance, valve 404 is secured by means of a bolt 404a rather than with a special 10 venting cap as described earlier.
In Figure lS, there is shown an alternative structure for the automatic shut-offvalve assembly of the present inverltion. In this structure, there is provided a valve assembly designated generally at 500, having an inlet 501 and an outlet 502.
The inlet 501 leads into inlet chamber 527 which ~ with a bleed IS passage 503 which includes a metering pin 504 which thus provides flow restriction to a bleed passage chamber 505 from which leads to a bleed passage outlet 506 to which is secured a flexible tubing 508. Tubing 508 is secured to the outlet 506 by means of securing means 507, and leads to a level sensor flow control means or valve or preferably a float actuated valve as deæribed previously but is not shown here. The 20 inlet chamber 527 leads to a main chamber 528 and flow Lh.,le~ is controlled by a main valve 530. The main part of valve body 520 has an end piece 525 open to internal atmosphere of tbe tank and a lower closing space S09. The main valve 530 may be considered as a single functioning entity in which a spool 515 travels axially.
The valve body SZ0 internal diameter is larger at one end than the other, and at the 25 larger end the spool SlS il.~u,l a piston S11 which carries on its outer diameter a low friction ~ type seal 513. The seal 513, m turn, slides m the bore 520a of the valve body SA~0.
Near the centre of the valve body 520, an inturned flange 540 is shaped to form a seat 540a for a face seal 514, preferably a quad seal, which is secured to the 3û back of the piston S11, so that when the latter is driven towards the seal seat 540a, either by spring (S10) pressure or hydrostatic pressure on the piston face SlOa, the sealing action prevents fluid flow through the body of the valve, i.e. into mainchamber 528.
At the other, smaller diameter, end of the valve body 520, a c(",~ lly 35 available rolling diaphragm 521 is attached to the end of the spool SlS to form a "zero friction" seal and to centre the spool SlS in the bore 520a. This A.l~l~L" .11. .
effectively contains the fluid within the body of the shut-off valve assembly 500 at WO95/lZ545 2 1 7 5 9 a 3 PCT/CA94/00615 this end while allowing free movement of the spool 515 in reaction to the pressure and force vir~l~ ' which may exist in the valve body 520.
An outlet poppet valve 560 receives the fluid flow from vhe outlet port 502 of the shut-off valve assembly 500 and discharges it into the tank (not shown), either S directly or through a diffusion conduit of some kind (not shown). The function of this valve is to maintain a reasonably constant pressure differential between the interior of the shut-off valve assembly 500 and the discharge to the tank (not shown).
In its ~u.~.lu~Livll, it resembles a ~VII~ iVllal check valve with a spring (518) loaded poppet 517 and guide 519 which can be displaced by upsvream fluid pressure.
10 However it is not called upon to block flow in the reverse direction and is not required to have a pressure tight seat.
The shape and dimensions of the flOw path through the outlet poppet valve 560 and vhe spring 518 are chosen so vhat at the lowest expected flow rate, the poppet 517 will be displaced a small amount to provide a narrow armular orifice with a 15 pre-determined pressure drop. Whatever static pressure is developed at vhe poppet face due to this pressure drop will be balanced by vhe force of the spring 518 to bring the forces into ~.l.,;l;l"; ~
It will be noted that the internal diameter of the outlet poppet valve body 560 increases in vhe direction of flow so that the further the poppet 517 is displaced, the 20 greater the cross-sectional area of the annular orifice (and c~ l" /ly the lower the pressure drop at any fixed flow rate). As a result, if the flow rate should be higher, up to the maximum expected, the initial high pressure drop across the poppet 517 will cause a greater ~ of the latter until the forces are again in balance. Since the reactive force of the spring 518 under this condition would obviously be greater 25 than under the low flow condition, a somewhat higher pressure drop would result. By judicious selection of the spring 518 rate and its 1' , the difference in pressure drop between high and low flow conditions can be held to a few pounds per square inch.
Operation of the valve assembly of this c ' ' is in principle very 30 similar to the operation of the earlier described structures. However, this description will highlight the particular differences.
Starting from a condition in which the vehicle tank fluid level is low, the mainvalve assembly 520 will be empty or will contain residual fluid at the same pressure as the fuel tank interior (not shown), the shut-off valve 520 will be held by spring 35 (510) pressure in its closed position; the outlet poppet valve (560) will be in its closed position; and a tank inlet adapter poppet (not shown) will be closed, creating a seal between the tank interior and the ell~ill An associated float actuated valve will WO 9~/12545 PCT/CA94/00615 ~
21 75qO3 16 be open at this point.
To start refuelling, a nozzle will be connected to the inlet adapter which hlCu~ means to eliminate spillage (not shown) and the nozzle manual shut-off valve (not shown) opened. This will allow the hydrostatic head of the supply line to 5 displace the inlet adapter poppet, and the fluid to flow under pressure into the valve inlet section or chamber 527 (through a fine mesh screen if necessary).
The pressure in the valve inlet chamber 527 will cause a small flow of tbe fluid through the bleed passage 503 mto the bleed passage chamber 505 of the shut-off valve body 520 and thence, by way of the tubing 508, to be discharged 10 through valve openings into the tank. The dimensions and C~ liyl~ of the bleed passage 503 are such that there will be a high pressure drop between the valve inlet section and the end cavity of the shut-off valve body. The shape and dimensions of metering pin 504 is selected d~,uld-l-~;ly to provide .I~)~JIU,U ' ' flow rates.(~.,.. ~.. 1.. lly the fluid pressure in tbe cavity will be of a low order.A differential pressure will appear across the piston S11, of sufficient maglutude to compress the spring SlO and cause the spool assembly SlS to move toopen the shut-off valve 530 and thus perrnit fluid flow into the du .. ~L~ chamber 528 of the shut-off valve body and thence the outlet poppet valve 560 into the tank.
As e~plained above, the pressure drop across the outlet poppet valve 560 wi 20 create a back pressure in the shut-off valve body 520 and this will serve to hold the shut-off valve spool 515 in the open position against the spring 510.
When the tank fluid level rises sufFIciently to cause the float to close its associated valve, flow from the shut-off valve cavity 528 will be blocked and static preSsure in the cavity will increase due to its commection through the bleed passage 25 with the valve inlet chamber 527. Eventually, the cavity pressure will be of the same order as that in the main chamber 528 of the shut-off valve 530. Because of the differential areas of the piston faces and the spring 510 pressure, the forces acting on the spool 515 will be unbalanced causimg the spool 515 to move to close the shut-off valve 530.
With no flow through the shut-off valve 530 or the level sensor flow control means or valve or float valve (not shown), there will be no pressure drop across the tank inlet adapter and its spring will move the poppet into the closed position.Closing the manual nozzle valve would have the same effect. None of these structures are shown. With the manual nozzle valve closed, the nozzle can be 35 .1i~.. ,.. ~.1 from the tank inlet adapter with a dry break.
Referring to Figure 16 of the drawmgs there is illustrated a greatly enlarged view in lon~ihuiin~l cross section of check valve which may be used in place of the .

metering pin and metering tube described earlier. Valve housing 600 has openrngs604 and 605, which are an outlet and an rnlet, ~ ,ly. The outlet 604 is closed by means of ball 602 which is held closed normally by spring 601. The valve housing would be placed in a similar location to the metering tube 42 and metering S pin 44 as described earlier.
It will be apparent from readrng this description of preferred ,lllbU '' ' tbatmany ...~ - or alterations may be made without departing from the spirit and scope of the invention as defned irl the following claims, which are meant also to encompass all equivalent forms of the invention as would be apparent to a person10 skilled in the art.

Claims (20)

WE CLAIM:
1. An automatic shut-off valve arrangement for use in fluid transfer operations which comprises an inlet and an outlet, means for securing the arrangement to a fluid container such that incoming fluid passes through the arrangement when entering the container, the inlet being opened and closed in response to application of external mechanical opening means and/or incoming fluid pressure, and the outletbeing normally closed but opened in response to fluid flow through the arrangement to the container, level sensor flow control means actuated in response to fluid in the tank reaching a predetermined level, and connected to means for controlling flow through a main valve, and arranged to be in communication with incoming fluid and with operating means of the main valve located in a main valve chamber such that fluid back pressure from the level sensor flow control means acts upon the operating means of the main valve to close the main valve and the main chamber such that fluid is no longer delivered to the fluid container and the valve assembly is shut off.
2. A valve arrangement as claimed in claim 1 which comprises an inlet chamber and an associated inlet valve, which controls flow to the inlet chamber, a main chamber and an associated main valve operating means, which controls flow to the outlet chamber from the main chamber, and an outlet chamber and an associated outlet valve, a bleed passage comprising a flow restriction section in communication with the inlet chamber, and being in communication with a volume chamber associated with the operating means of the main valve, the arrangement being such that a portion of incoming fluid passes into the bleed passage when fluid flows through the assembly into the container, and out to the level sensor flow control means, which is open when fluid in the container is low, and when the level of fluid in the container reaches a predetermined level, the level sensor flow control means closes and fluid back pressure through the bleed passage forces fluid through to the volume chamber of the operating means of the main valve, whereupon the main valve closes as the piston is displaced and fluid flow to the outlet chamber and the container is stopped and the valve arrangement shuts off.
3. A valve arrangement as claimed in claim 1 wherein the valve and level sensor flow control means, and the means for controlling flow through the main valve comprise an integral unit which may be mounted in a fluid container.
4 . A valve arrangement as claimed in claim 1 wherein the level sensor flow control means is located separately in the fluid container.
5. A valve arrangement as claimed in claim 2 wherein the operating means of the main valve is a piston which includes a volume chamber connected tothe bleed passage.
6. A valve arrangement as claimed in claim 2 wherein the operating means includes a diaphragm spool and piston, and associated piston volume chamber connected to the bleed passage.
7. A valve arrangement as claimed in claim 2 wherein the level sensor flow control means is selected from the group comprising pneumatic, mechanical, optical, electrical, electronic, magnetic means and equivalent means.
8. A valve arrangement as claimed in claim 2 wherein the level sensor flow control means is a float actuated valve.
9. A valve arrangement as claimed in claim 1 wherein the assembly is used in a fluid transfer system which includes a fluid supply and associated nozzle, the latter having a shut-off valve, a coupler for securing the nozzle to an inlet means of a containment zone for fluid, and the valve assembly is secured to the inlet means and the level sensor flow control means is located in the fluid containment zone.
10. A valve arrangement as claimed in claim 9 wherein the zone is a fuel tank of a vehicle and the fluid is fuel.
11. A valve arrangement as claimed in claim 9 wherein the zone is a stationary storage tank.
12. An automatic shut-off valve arrangement for use in fluid transfer operations which comprises an inlet and an outlet, means for securing the arrangement to a fluid container such that incoming fluid passes through the arrangement when entering the container, the inlet being opened and closed in response to application of external mechanical opening means and/or incoming fluid pressure, and the outletbeing normally closed but opened in response to fluid flow through the arrangement to the container, a float actuated valve actuated in response to fluid in the tank reaching a predetermined level, and connected to means for controlling flow through a main valve, and arranged to be in communication with incoming fluid, and with operating means of the main valve located in a main valve chamber, such that fluid back pressure from the float actuated valve acts upon the operating means of the mainvalve to close the main valve and the main chamber, such that fluid is no longerdelivered to the fluid container, and the valve assembly is shut off.
13. An automatic shut-off valve arrangement for use in fluid transfer operations which comprises an inlet and an outlet, means for securing the arrangement to a fluid container such that incoming fluid passes through the arrangement when entering the container, the inlet being opened and closed in response to application of external mechanical opening means and/or incoming fluid pressure, and the outletbeing normally closed but opened in response to fluid flow through the arrangement to the container, an ancillary float actuated valve, actuated in response to fluid in the tank reaching a predetermined level, and connected to a bleed passage provided with flow restricting means, and arranged to be in communication with incoming fluid and with operating means of the main valve located in a main valve chamber such thatfluid back pressure from the float actuated valve acts upon the operating means of the main valve to close the main valve and the main chamber such that fluid is no longer delivered to the fluid container and the valve assembly is shut off.
14. An automatic shut-off valve assembly for installation in a fuel tank which assembly comprises an inlet and an outlet, means for securing the assembly to the fuel tank, means for connecting the assembly to level sensor flow control means located in the fuel tank which serves to activate the valve assembly to shut it off;
the valve assembly having an inlet chamber and an associated inlet valve, a main chamber and an associated main valve with operating means, an outlet chamber and an associated outlet valve, the valve assembly being accessible from the tank inlet;
the inlet valve being opened and closed in response to the application or removal of external mechanical opening means and/or pressure of incoming fluid, and the inlet chamber having means for controlling flow through the main valve;
the operating means of the main valve being normally open to permit fluid flow to the main chamber from the inlet chamber, and moving to its closed position in response to fluid back pressure on the operating means;
the outlet valve being normally closed, but opening in response to fluid pressure from the main chamber;
the flow path through the valve being such that during fuelling, the valves are open and permit flow into the tank, and some flow occurs through the flow control means to the level sensor flow control means, which is open when the fuel level is low, and fuel flows into the fuel tank; and when the level sensor flow control means closes, upon the tank being filled to a predetermined level, back pressure in the bleed passage causes the main valve to close and to stop fluid flow into the outlet chamber, whereupon pressure on the outlet valve ceases and the outlet valve closes, and as no pressure drop exists across the inlet valve, in the absence of any external mechanical opening means, the inlet valve closes.
15. A valve assembly as claimed in claim 14 wherein the level sensor flow control means is selected from pneumatic, mechanical, optical, electrical, electronic, magnetic means and equivalents thereof.
16. A valve assembly as claimed in claim 14 wherein the level sensor flow control means is a float actuated valve.
17. A valve assembly as claimed in claim 16 wherein the means for controlling flow through the inlet chamber comprises a bleed passage in the shut-off valve, which comprises a cylindrical chamber which extends from the interior of the inlet poppet to the float valve, a first portion containing a metering tube and a metering pin both of which are sized to provide annular clearance between each other and the channel; and a bleed tube surrounding a portion of the metering tube, and arranged such that there is annular space therebetween, the bleed tube being sized to fit within the channel such that back flow pressure from the level sensor flow control means results in fluid flow into and around the metering tube to reach the volume chamber of the piston.
18. A valve assembly as claimed in claim 14 comprising an integral unit.
19. A valve assembly as claimed in claim 14 wherein the unit is mounted in a fuel tank inlet and the level sensor flow control means is located separately in the fuel tank.
20. A valve assembly as claimed in claim 17 wherein the bleed passage is connected to the float actuated valve by a flexible tube.
CA 2175903 1993-11-05 1994-11-07 Automatic shut-off valve arrangement Abandoned CA2175903A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA 2175903 CA2175903A1 (en) 1993-11-05 1994-11-07 Automatic shut-off valve arrangement

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
CA002102569A CA2102569A1 (en) 1993-11-05 1993-11-05 Automatic shut-off valve arrangement
CA2,102,569 1993-11-05
US08/334,205 US5813432A (en) 1993-11-05 1994-11-04 Automatic shut-off valve arrangement
US08/334,205 1994-11-04
CA 2175903 CA2175903A1 (en) 1993-11-05 1994-11-07 Automatic shut-off valve arrangement

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CA2175903A1 true CA2175903A1 (en) 1995-05-11

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US8152751B2 (en) 2007-02-09 2012-04-10 Baxter International Inc. Acoustic access disconnection systems and methods
US8376978B2 (en) 2007-02-09 2013-02-19 Baxter International Inc. Optical access disconnection systems and methods
US8529490B2 (en) 2002-04-10 2013-09-10 Baxter International Inc. Systems and methods for dialysis access disconnection
US8708946B2 (en) 2002-04-10 2014-04-29 Baxter International Inc. Access disconnection systems using conductive contacts
US8920356B2 (en) 2002-04-10 2014-12-30 Baxter International Inc. Conductive polymer materials and applications thereof including monitoring and providing effective therapy
US9138536B2 (en) 2008-04-01 2015-09-22 Gambro Lundia Ab Apparatus and a method for monitoring a vascular access
US10155082B2 (en) 2002-04-10 2018-12-18 Baxter International Inc. Enhanced signal detection for access disconnection systems
US10463778B2 (en) 2007-02-09 2019-11-05 Baxter International Inc. Blood treatment machine having electrical heartbeat analysis

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US8708946B2 (en) 2002-04-10 2014-04-29 Baxter International Inc. Access disconnection systems using conductive contacts
US10155082B2 (en) 2002-04-10 2018-12-18 Baxter International Inc. Enhanced signal detection for access disconnection systems
US8920356B2 (en) 2002-04-10 2014-12-30 Baxter International Inc. Conductive polymer materials and applications thereof including monitoring and providing effective therapy
US8529490B2 (en) 2002-04-10 2013-09-10 Baxter International Inc. Systems and methods for dialysis access disconnection
US8801646B2 (en) 2002-04-10 2014-08-12 Baxter International Inc. Access disconnection systems with arterial and venous line conductive pathway
US8603020B2 (en) 2007-02-09 2013-12-10 Baxter International Inc. Ultrasound access disconnection systems and methods
US8795217B2 (en) 2007-02-09 2014-08-05 Baxter International Inc. Acoustic access disconnection systems and methods
US8920355B2 (en) 2007-02-09 2014-12-30 Baxter International Inc. Acoustic access disconnection systems and methods
US8376978B2 (en) 2007-02-09 2013-02-19 Baxter International Inc. Optical access disconnection systems and methods
US9089654B2 (en) 2007-02-09 2015-07-28 Baxter International Inc. Acoustic access disconnection systems and methods
US9138528B2 (en) 2007-02-09 2015-09-22 Baxter International Inc. Acoustic access disconnection systems and methods
US9352078B2 (en) 2007-02-09 2016-05-31 Baxter International Inc. Electrical heartbeat access disconnection systems
US9950105B2 (en) 2007-02-09 2018-04-24 Baxter International Inc. Blood treatment and electrical blood leak detection device therefore
US8152751B2 (en) 2007-02-09 2012-04-10 Baxter International Inc. Acoustic access disconnection systems and methods
US10463778B2 (en) 2007-02-09 2019-11-05 Baxter International Inc. Blood treatment machine having electrical heartbeat analysis
US9138536B2 (en) 2008-04-01 2015-09-22 Gambro Lundia Ab Apparatus and a method for monitoring a vascular access
US8632486B2 (en) 2008-07-25 2014-01-21 Baxter International Inc. Electromagnetic induction access disconnect systems
US8114043B2 (en) 2008-07-25 2012-02-14 Baxter International Inc. Electromagnetic induction access disconnect sensor

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