CA1064366A - Fluid transfer systems and valves therefor - Google Patents
Fluid transfer systems and valves thereforInfo
- Publication number
- CA1064366A CA1064366A CA245,542A CA245542A CA1064366A CA 1064366 A CA1064366 A CA 1064366A CA 245542 A CA245542 A CA 245542A CA 1064366 A CA1064366 A CA 1064366A
- Authority
- CA
- Canada
- Prior art keywords
- liquid
- tank
- air
- float
- air transfer
- 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.)
- Expired
Links
Landscapes
- Jet Pumps And Other Pumps (AREA)
- Loading And Unloading Of Fuel Tanks Or Ships (AREA)
Abstract
Abstract of the Disclosure A pumping system intended especially for highly contaminated liquids uses an air pump for selectively drawing liquid into or discharging the liquid from a vessel by creating respectively a vacuum or a pressurized condition within the vessel.
A special primary valve device is provided for the system comprising an air filter in combination with a float-actuated, shut-off switch to preclude the entry of air or liquid-borne contaminants into the pump. The float-actuated switch is arranged to disable an engine used for driving the pump. The system also comprises a secondary float valve located between the pump and the primary valve device in case the primary valve device leaks, to preclude the passage of liquid therebetween, the valve having a sight glass to detect leakage liquid and a drain cock to permit drainage of such liquid.
A special primary valve device is provided for the system comprising an air filter in combination with a float-actuated, shut-off switch to preclude the entry of air or liquid-borne contaminants into the pump. The float-actuated switch is arranged to disable an engine used for driving the pump. The system also comprises a secondary float valve located between the pump and the primary valve device in case the primary valve device leaks, to preclude the passage of liquid therebetween, the valve having a sight glass to detect leakage liquid and a drain cock to permit drainage of such liquid.
Description
---` 11)643~;6 FLUID TRANSFER SYSTEMS AND VALVES THEREFOR
.. ... _ . _ _ . . _ Field of the Invention .
This invention is directed to fluid transfer systems such as are used in combination with a liquid storage vessel to draw liquid therein and to dischar~e liquid therefrom, and to valves for use in such sys~ems in combination with an air pump and a prime mover for the pump.
Review of the Prior Art The handling of contaminated and/or corrosive liquids, e.g. containing abrasives or sludges therein, presents consider- -able problems, particularly in view of the hazard to any pumping mechanism used for the transfer of the liquids into and out of a vessel used for its storage and/or transfer. In order to avoid the need for passage of such liquids through the pump it is usual to employ a reversible air pump arranged to control the pressu~e condition within the container into which the contaminated liqu,id is drawn under suction, or from which it is expelled by contai~er - pressurization.
Such pumps are of high capacity and high pressure and consequently are relatively expensive; owing to the nature of the liquids or semi-liquids requiring to be pumped, and the quality of the operators frequently used for sUch work, it i8 extremely difficult to substantially entirely preclude the carry-over of small quantities of liquids to the pump of the system, and even small quantities ~ill be sufficient to damage the expen-sive pump.
,1 , The present invention'provides a fluid transfer system ~i and a valve therefor wherein the passage of liquid or air-borne contaminants to the pump i8 substantially precluded.
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Definition of the Invention In accordance with this invention there is provided a fluid transfer system for transferring liquid from a source thereof to the interior of a liquid-receiving tank by the withdrawal of air from the said interior and for transferring liquid from the tank interior to the exterior thereof by the supply of air to the said interior comprising: an air transfer pump unit for the said withdrawal of and supply of air; and air transfer passage connecting the interior of the tank to the air transfer pump unit; a first float responsive means positioned at least partly in the tank interior and actuated in response to the presence of a predetermined level of liquid in the tank interior to close the air transfer passage and thereby preclude the passage of liquid into the air transfer passage; and a secondary float valve means connected in the air transfer passage between the said air pump unit and the said first float responsive means and actuated in response to receipt of liquid from the air transfer passage between the first float responseive means and ; itself to close the air transfer passage and thereby further preclude the possibility of passage of liquid from the tank interior to the air transfer pump unit.
; The float responsive means may include a float posi-tioned to be engaged by liquid in the tank, and switch means are connected therewith for actuation on floatation of the float in the liquid to terminate withdrawal of air from the said tank interior. The system may be employed in combination `` with an engine connected in driving relation with the air transfer , pump unit for operation thereof, wherein said switch means comprises a disabling switch operable upon the presence of the said predetermined level of liquid in the tank interior to . .
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1~)6~3~;6 stop operation of the engine and thereby prevent ~peration of the pump unit. Preferably the system is used in combination with a truck wherein the said tank is a liquid transfer tank - mounted on the truc~ and having said engine as the propulsive means therefore, said float responsive means being mounted at the top of the tank.
A system and valve means in accordance with the present invention is of particular utility for a truck-mounted tank and pump system, in that a suction hose may be connected from the truck tank to a source of contaminated liquid to be pumped into the tank. The truck engine power take-off powers the pump which is arranged by an associated controllable valve system to evacuate the interior of the tank connected via the above-mentioned primary and a secondary float valves. When the tank is sufficiently filled with the liquid to trip the primary float valve the truck engine is shut-down, in the manner dis-closed, by disconnecting the ignition. Thus the truck may be left unattended during the tank filling operation without posing any danger of damage to the comparatively expensive air pump.
` 20 Description of the Drawings A preferred embodiment will now be described, by way of example, with reference to the accompanying diagrammatic drawings, wherein:
FIGURE 1 iS a side view of a tank truck incorporating a fluid transfer system in accordance with the present invention, FIGURE 2 is a diametrical sectional elevation of a primary float-responsive valve means in accordance with this invention, and FIGURE 3 is a front elevation of a secondary float-responsivs valvs with thg front cover rsmovsd.
A. .
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10~43~i Description of the Preferxed Embodiment Referring to Figure 1 a truck 10 has a bulk liquid tank 12 mounted thereon. A power take-off shaft 14 from the truck engine (not shown) is connected in driving relation with an air compressing or evacuating pump unit 16 of known type operable in known manner, e.g. by change-over valves in its piping, in air compressing or air evacuating mode with regard to an external connection hose 18, through which the interior of the tank may be respectively selectively pressurized or evacuated under the control of an operator. The structure of such pump units is sufficiently well known to those skilled in the art as not to require any more detailed explanation or illustration. A primary float responsive valve means 20 in accordance with the invention is mounted at the top of the tank 12 in the wall 22 thereof, and is connected by a hose 24 with a secondary float valve 26, to which the hose 18 also connects.
'~ Referring now especially to Figure 2, the interior of the valve 20 is divided by a barrier 28 into a lower or secondary chamber 30 bounded by perforated walls 32, which constitute .~
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a particle filter. This chamber 30 and the tank interior con-stitute a so-called second zone of the system. A gas transfer passage formed by a tube 36 mounted in the barrier 28 and having a chamfered seat portion 38 cDnnects the secondary chamber 30 to a primary chamber 40 which is partially bounded by an air filter cartridge 42 of cylindrical form, a ring 44 serving to locate the cartridge radially. This chamber 40 constitutes ~- part of the so-called first zone of the system. A cylindrical wall 50 of the valve is welded into an aperture in the tank wall 22 and has clamp brackets 52 fixed thereto for the attach-ment of bolts 54 which serve to secure a cover 56 on the valve.
A resilient gasket 58 is interposed between the cover 56 and the upper edge of the filter cartridge 42, the cover completing the chamber 40.
A float 60 is mounted by means of coaxially aligned, diametrically-opposed stems 62 and 64 for vertical movement -in upper and lower guides 66, The upper stem 62 engages the operating member 68 of a switch 70 mounted on the inside of the cover 56, from which a connection 72 extends to the igni-tion system 74 of the vehicle (illustrated diagrammatically in Figure 1).
, The secondary float valve26 includes an internal ' barrier 28, a passage tube 36 and a valvefloat 60, but does not include a switch 70 and does not necessarily include particle filter 32 and/or air filter 42. A sight glass 76 pér-mits visual detection of the presence of liquid within the valve 26, and a removeable drain plug 78 facilitates drainage of liquid from out of the valve.
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In operation, the inlet of a fillex hose 80 is sub-merged beneath the surface of a liquid to be transferred to ` the interior of the tank 12, and the valve 82 is opened; upon engagement of the engine power take off 14 to drive the pum~
16 in an air evacuating mode air pressure within the tank 12 is reduced and liquid flows through the hose 80 to fill the ` tank. When the liquid level raises the float 60 sufficiently to actuate the cut-off switch 7b the circuit represented by connection 72 is opened and the ignition of the truck engine is switched off. Closure of the valve 82 completes the opera-tion. In order to empty the tank 12 when desired the output of pump 16 is reversed to positively pressurize the tank 12 and discharge the liquid contents of the tank when the valve 92 is opened.
`~ 15 A further function provided by the primary valve 20 is the cooperation of the spherical float member 60 with the . chamfered seat 38 to provide a positive barrier to the flow of ; liquid from the second zone into the first zone, and also to preclude upward splashing of the liquid into contaminating relation with the air filter cartridge 42 during movement of the truck. In the event that some liquid should nevertheless escape past the valve 20 it i~ further prevented by the secon-dary valve 26 from reaching the pump.
It will be understood that the portion of the vehicle engine ignition circuit controlled by the switch 70 will , . .
'x usually be additional to the standard circuit, so that opera-tion of the truck engine in a truck driving mode may be effected after completion of a tank filling operation, despite the above-mentioned dlsabling of the engine ignition circuit by ~, 30 the actuation of the switch 68. The specific electrical 'i ~, , 1 ~ 6 -: : . . ~. . .
10643~i circuit required for such operation will be apparent to those skilled in the art and further description and illustration thereof is not believed necessary. The present invention thus provides a simple, low cost and robust control system and valve therefor which may be readily operated, serviced and maintained.
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.. ... _ . _ _ . . _ Field of the Invention .
This invention is directed to fluid transfer systems such as are used in combination with a liquid storage vessel to draw liquid therein and to dischar~e liquid therefrom, and to valves for use in such sys~ems in combination with an air pump and a prime mover for the pump.
Review of the Prior Art The handling of contaminated and/or corrosive liquids, e.g. containing abrasives or sludges therein, presents consider- -able problems, particularly in view of the hazard to any pumping mechanism used for the transfer of the liquids into and out of a vessel used for its storage and/or transfer. In order to avoid the need for passage of such liquids through the pump it is usual to employ a reversible air pump arranged to control the pressu~e condition within the container into which the contaminated liqu,id is drawn under suction, or from which it is expelled by contai~er - pressurization.
Such pumps are of high capacity and high pressure and consequently are relatively expensive; owing to the nature of the liquids or semi-liquids requiring to be pumped, and the quality of the operators frequently used for sUch work, it i8 extremely difficult to substantially entirely preclude the carry-over of small quantities of liquids to the pump of the system, and even small quantities ~ill be sufficient to damage the expen-sive pump.
,1 , The present invention'provides a fluid transfer system ~i and a valve therefor wherein the passage of liquid or air-borne contaminants to the pump i8 substantially precluded.
, . :
~ ' .
:' .
-` ~0643~;
Definition of the Invention In accordance with this invention there is provided a fluid transfer system for transferring liquid from a source thereof to the interior of a liquid-receiving tank by the withdrawal of air from the said interior and for transferring liquid from the tank interior to the exterior thereof by the supply of air to the said interior comprising: an air transfer pump unit for the said withdrawal of and supply of air; and air transfer passage connecting the interior of the tank to the air transfer pump unit; a first float responsive means positioned at least partly in the tank interior and actuated in response to the presence of a predetermined level of liquid in the tank interior to close the air transfer passage and thereby preclude the passage of liquid into the air transfer passage; and a secondary float valve means connected in the air transfer passage between the said air pump unit and the said first float responsive means and actuated in response to receipt of liquid from the air transfer passage between the first float responseive means and ; itself to close the air transfer passage and thereby further preclude the possibility of passage of liquid from the tank interior to the air transfer pump unit.
; The float responsive means may include a float posi-tioned to be engaged by liquid in the tank, and switch means are connected therewith for actuation on floatation of the float in the liquid to terminate withdrawal of air from the said tank interior. The system may be employed in combination `` with an engine connected in driving relation with the air transfer , pump unit for operation thereof, wherein said switch means comprises a disabling switch operable upon the presence of the said predetermined level of liquid in the tank interior to . .
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1~)6~3~;6 stop operation of the engine and thereby prevent ~peration of the pump unit. Preferably the system is used in combination with a truck wherein the said tank is a liquid transfer tank - mounted on the truc~ and having said engine as the propulsive means therefore, said float responsive means being mounted at the top of the tank.
A system and valve means in accordance with the present invention is of particular utility for a truck-mounted tank and pump system, in that a suction hose may be connected from the truck tank to a source of contaminated liquid to be pumped into the tank. The truck engine power take-off powers the pump which is arranged by an associated controllable valve system to evacuate the interior of the tank connected via the above-mentioned primary and a secondary float valves. When the tank is sufficiently filled with the liquid to trip the primary float valve the truck engine is shut-down, in the manner dis-closed, by disconnecting the ignition. Thus the truck may be left unattended during the tank filling operation without posing any danger of damage to the comparatively expensive air pump.
` 20 Description of the Drawings A preferred embodiment will now be described, by way of example, with reference to the accompanying diagrammatic drawings, wherein:
FIGURE 1 iS a side view of a tank truck incorporating a fluid transfer system in accordance with the present invention, FIGURE 2 is a diametrical sectional elevation of a primary float-responsive valve means in accordance with this invention, and FIGURE 3 is a front elevation of a secondary float-responsivs valvs with thg front cover rsmovsd.
A. .
:
10~43~i Description of the Preferxed Embodiment Referring to Figure 1 a truck 10 has a bulk liquid tank 12 mounted thereon. A power take-off shaft 14 from the truck engine (not shown) is connected in driving relation with an air compressing or evacuating pump unit 16 of known type operable in known manner, e.g. by change-over valves in its piping, in air compressing or air evacuating mode with regard to an external connection hose 18, through which the interior of the tank may be respectively selectively pressurized or evacuated under the control of an operator. The structure of such pump units is sufficiently well known to those skilled in the art as not to require any more detailed explanation or illustration. A primary float responsive valve means 20 in accordance with the invention is mounted at the top of the tank 12 in the wall 22 thereof, and is connected by a hose 24 with a secondary float valve 26, to which the hose 18 also connects.
'~ Referring now especially to Figure 2, the interior of the valve 20 is divided by a barrier 28 into a lower or secondary chamber 30 bounded by perforated walls 32, which constitute .~
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.
a particle filter. This chamber 30 and the tank interior con-stitute a so-called second zone of the system. A gas transfer passage formed by a tube 36 mounted in the barrier 28 and having a chamfered seat portion 38 cDnnects the secondary chamber 30 to a primary chamber 40 which is partially bounded by an air filter cartridge 42 of cylindrical form, a ring 44 serving to locate the cartridge radially. This chamber 40 constitutes ~- part of the so-called first zone of the system. A cylindrical wall 50 of the valve is welded into an aperture in the tank wall 22 and has clamp brackets 52 fixed thereto for the attach-ment of bolts 54 which serve to secure a cover 56 on the valve.
A resilient gasket 58 is interposed between the cover 56 and the upper edge of the filter cartridge 42, the cover completing the chamber 40.
A float 60 is mounted by means of coaxially aligned, diametrically-opposed stems 62 and 64 for vertical movement -in upper and lower guides 66, The upper stem 62 engages the operating member 68 of a switch 70 mounted on the inside of the cover 56, from which a connection 72 extends to the igni-tion system 74 of the vehicle (illustrated diagrammatically in Figure 1).
, The secondary float valve26 includes an internal ' barrier 28, a passage tube 36 and a valvefloat 60, but does not include a switch 70 and does not necessarily include particle filter 32 and/or air filter 42. A sight glass 76 pér-mits visual detection of the presence of liquid within the valve 26, and a removeable drain plug 78 facilitates drainage of liquid from out of the valve.
l ~
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``" 10~43~
In operation, the inlet of a fillex hose 80 is sub-merged beneath the surface of a liquid to be transferred to ` the interior of the tank 12, and the valve 82 is opened; upon engagement of the engine power take off 14 to drive the pum~
16 in an air evacuating mode air pressure within the tank 12 is reduced and liquid flows through the hose 80 to fill the ` tank. When the liquid level raises the float 60 sufficiently to actuate the cut-off switch 7b the circuit represented by connection 72 is opened and the ignition of the truck engine is switched off. Closure of the valve 82 completes the opera-tion. In order to empty the tank 12 when desired the output of pump 16 is reversed to positively pressurize the tank 12 and discharge the liquid contents of the tank when the valve 92 is opened.
`~ 15 A further function provided by the primary valve 20 is the cooperation of the spherical float member 60 with the . chamfered seat 38 to provide a positive barrier to the flow of ; liquid from the second zone into the first zone, and also to preclude upward splashing of the liquid into contaminating relation with the air filter cartridge 42 during movement of the truck. In the event that some liquid should nevertheless escape past the valve 20 it i~ further prevented by the secon-dary valve 26 from reaching the pump.
It will be understood that the portion of the vehicle engine ignition circuit controlled by the switch 70 will , . .
'x usually be additional to the standard circuit, so that opera-tion of the truck engine in a truck driving mode may be effected after completion of a tank filling operation, despite the above-mentioned dlsabling of the engine ignition circuit by ~, 30 the actuation of the switch 68. The specific electrical 'i ~, , 1 ~ 6 -: : . . ~. . .
10643~i circuit required for such operation will be apparent to those skilled in the art and further description and illustration thereof is not believed necessary. The present invention thus provides a simple, low cost and robust control system and valve therefor which may be readily operated, serviced and maintained.
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Claims (9)
1. A fluid transfer system for transferring liquid from a source thereof to the interior of a liquid-receiving tank by the withdrawal of air from the said interior and for transferring liquid from the tank interior to the exterior thereof by the supply of air to the said interior comprising:
an air transfer pump unit for the said withdrawal of and supply of air;
an air transfer passage connecting the interior of the tank to the air transfer pump unit;
a first float responsive means positioned at least partly in the tank interior and actuated in response to the presence of a predetermined level of liquid in the tank interior to close the air transfer passage and thereby pre-clude the passage of liquid into the air transfer passage;
and a secondary float valve means connected in the air transfer passage between the said air pump unit and the said first float responsive means and actuated in response to receipt of liquid from the air transfer passage between the first float responsive means and itself to close the air transfer passage and thereby to further preclude the possi-bility of passage of liquid from the tank interior to the air transfer pump unit.
an air transfer pump unit for the said withdrawal of and supply of air;
an air transfer passage connecting the interior of the tank to the air transfer pump unit;
a first float responsive means positioned at least partly in the tank interior and actuated in response to the presence of a predetermined level of liquid in the tank interior to close the air transfer passage and thereby pre-clude the passage of liquid into the air transfer passage;
and a secondary float valve means connected in the air transfer passage between the said air pump unit and the said first float responsive means and actuated in response to receipt of liquid from the air transfer passage between the first float responsive means and itself to close the air transfer passage and thereby to further preclude the possi-bility of passage of liquid from the tank interior to the air transfer pump unit.
2. The system claimed in claim 1, in combination with an engine connected in driving relation with the air transfer pump unit for operation thereof, said first float responsive means includes a float positioned to be engaged by liquid in the tank, and switch means are connected therewith for actua-tion on floatation of the float in the liquid, wherein said switch means comprises a disabling switch operable upon the presence of the said predetermined level of liquid in the tank interior to stop operation of the engine and thereby stop operation of the pump unit.
3. The system claimed in claim 1, in combination with a truck wherein the said tank is a liquid transfer tank mounted on the truck and having said engine as the propulsive means therefor, said first float responsive means being mounted at the top of the tank.
4. The system claimed in claim 2, in combination with a truck wherein the said tank is a liquid transfer tank mounted on the truck and having said engine as the propulsive means therefor, said first float responsive means being mounted at the top of the tank.
5. The system claimed in claim 4, wherein said secondary float valve means includes a sight glass to permit visual detection of the presence of liquid in the valve means, and a drain for draining such liquid from the valve means.
6. The system claimed in any one of claims 1 to 3, wherein said secondary float valve means includes a sight glass to permit visual detection of the presence of liquid in the valve means, and a drain for draining such liquid from the valve means.
7. The system claimed in any one of claims 1 to 3, wherein the air transfer passage is connected to the tank interior by an air transfer port and the said first float responsive means comprises a floatable ball adapted upon floatation in said predetermined level of liquid to close the port.
8. The system claimed in any one of claims 1 to 3, wherein the air transfer passage is connected to the tank interior by an air transfer port and the said first float responsive means comprises a floatable ball adapted upon floatation in said predetermined level of liquid to close the port, and wherein an air filter is mounted in the first float responsive means between the air transfer port and the floatable ball to filter air passing through the air transfer port, and a liquid filter means is mounted in the first float responsive means between the floatable ball and the tank interior for filtering liquid passing there-through to the floatable ball.
9. The system claimed in claim 3, wherein said secondary float valve means is disposed on the truck at about the eye level of an operator and includes a sight glass to permit visual detection of the presence of liquid in the valve means, and a drain for draining such liquid from the valve means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA245,542A CA1064366A (en) | 1976-02-11 | 1976-02-11 | Fluid transfer systems and valves therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA245,542A CA1064366A (en) | 1976-02-11 | 1976-02-11 | Fluid transfer systems and valves therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1064366A true CA1064366A (en) | 1979-10-16 |
Family
ID=4105211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA245,542A Expired CA1064366A (en) | 1976-02-11 | 1976-02-11 | Fluid transfer systems and valves therefor |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1064366A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015125034A1 (en) * | 2014-02-21 | 2015-08-27 | Metaltecnica S.R.L. | Safety valve, with a buoyant valve member, in particular for tanks carried by vehicles |
-
1976
- 1976-02-11 CA CA245,542A patent/CA1064366A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015125034A1 (en) * | 2014-02-21 | 2015-08-27 | Metaltecnica S.R.L. | Safety valve, with a buoyant valve member, in particular for tanks carried by vehicles |
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