CA2685449A1 - Gas sample bag with two valves - Google Patents
Gas sample bag with two valves Download PDFInfo
- Publication number
- CA2685449A1 CA2685449A1 CA 2685449 CA2685449A CA2685449A1 CA 2685449 A1 CA2685449 A1 CA 2685449A1 CA 2685449 CA2685449 CA 2685449 CA 2685449 A CA2685449 A CA 2685449A CA 2685449 A1 CA2685449 A1 CA 2685449A1
- Authority
- CA
- Canada
- Prior art keywords
- valve
- gas sample
- needle
- stopcock
- valves
- 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
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/20—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials
- G01N1/2035—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials by deviating part of a fluid stream, e.g. by drawing-off or tapping
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
A gas sample bag having two molded plastic valves is described in the invention. Both stopcock valve and needle valve have a septum that permits a portion of gas sample to be withdrawn with a syringe. Both valves come with an arm for filling gas sample. Both stopcock valve and needle valve have excellent sealing property due to precision manufacturing process, an O-ring and lubricant is not required. A flexible synthetic fluoropolymer film with extreme low permeation property and extreme chemical stability is used to form a collapsible bag.
Description
Technical Field Molded valves, made of polytetrafluoroethylene (PTFE) or polypropylene (PP) are attached to a gas sample bag, which is made of polyfluoro film such as Tedla, fluorinated ethylene propylene (FEP). Gas sample bags are widely used to collect and store gaseous and liquid samples from gas cylinder, petrochemical industry, brewery, auto mobile emissions, landfills, houses and offices. Some gases have toxic and corrosive properties. Chemical inertness of fitting and valve is crucial to a gas sample bag as any chemical reaction between fitting/valve material and gas will compromise the authenticity of analytical results. Using chemically stable material such as PTFE can minimize the contamination in low concentration background, espeically in volatile organic compounds (VOCs) analysis.Two valves are installed on a gas sample bag to facilitate gas sample communicating inside and out from the bag.
Background Information and Prior Art Gas sample bags are used to collect gaseous and liquid samples from various sites such as industrial sits, landfills, waste yards, indoors. After collection, usually gas sample bags are transported into an analytical laboratory for analysis.
Usually a gas sample bag contains two components, a collapsible plastic film bag, one or two fittings or valves.
Laminated aluminum foil or polyfluoro films are used as bag materials. Glue is required to combine different layers of aluminum foil and polyethylene film together. However, glue may cause high background for low concentration analysis.
Also the property of such foil is not chemically stable and is not suitable for corrosive gases. This type of gas sample bag can only handle high concentration, non-corrosive gas collection.
Since the mid of 1980s, there has been a growing concern about the health risk from pollutants around our homes and offices. These pollutants, called volatile organic compounds (VOCs), are from building materials, paints, automobiles, cosmetics, laundry detergents, computers, printers, and other items to be named. In order to understand their adverse health effects, environmental scientists and health professionals have developed highly effective methods to detect these chemicals.
These methods include gas chromatography and gas chromatography/mass spectrometry. However, due to VOCs' low concentration, collecting and storage of VOCs' samples are challenging. Contaminants from gas sample bag itself may cause higher background and produce unreal analytical results.
Polyfluoro films such as Tedlar and FEP are widely recognized as chemically stable materials. It does not introduce any contaminants and has ultra low permeation property. EPA
Method 18 and EPA TO-14A, TO- 15 recommend the use of polyfluoro film bags to collect and store gases in measurements of gaseous organic compound emissions and volatile organic compounds.
Fittings and valves are usually made of polypropylene, stainless steel or polyfluoro plastic such as PTFE. Some inventors introduced different types of fittings or valves.
Detailed information can be found in US patents:
6055872(Little, Stephen R.), 2007/0269350 Al (Coyne, Linda S.), 4915356(Guild, Lloyd; Guild, Daniel).
A good valve should have following properties: reliable, chemically stable, easy to use, and not introducing contaminants. Unfortunately there are no ideal valves or fittings to meet the rigorous requirements so far. One of the most common drawbacks is that valves have an O-ring inside to prevent leakage. O-ring may produce potential contamination in ultra low concentration analysis such as volatile organic compounds analysis. Some valves need lubricant to prevent leakage. A renovated valve is needed to overcome drawbacks mentioned above.
Summary Of The Invention This invention is regarding to a gas sample bag with two valves, stopcock valve and needle valve. A stopcock valve has a cap with a silicone septum in it. A portion of gas sample can be withdrawn into a syringe for analysis. The stopcock valve comes with an arm that introduces gas sample. A needle valve has a septum that allows a portion of gas to be withdrawn by a syringe. The needle valve also has an arm.
Brief Description of the Drawings Fig. 1 is a gas sample bag with one stopcock valve 1 and one needle valve 2.
Fig. 2 is the section view of valve body.
Background Information and Prior Art Gas sample bags are used to collect gaseous and liquid samples from various sites such as industrial sits, landfills, waste yards, indoors. After collection, usually gas sample bags are transported into an analytical laboratory for analysis.
Usually a gas sample bag contains two components, a collapsible plastic film bag, one or two fittings or valves.
Laminated aluminum foil or polyfluoro films are used as bag materials. Glue is required to combine different layers of aluminum foil and polyethylene film together. However, glue may cause high background for low concentration analysis.
Also the property of such foil is not chemically stable and is not suitable for corrosive gases. This type of gas sample bag can only handle high concentration, non-corrosive gas collection.
Since the mid of 1980s, there has been a growing concern about the health risk from pollutants around our homes and offices. These pollutants, called volatile organic compounds (VOCs), are from building materials, paints, automobiles, cosmetics, laundry detergents, computers, printers, and other items to be named. In order to understand their adverse health effects, environmental scientists and health professionals have developed highly effective methods to detect these chemicals.
These methods include gas chromatography and gas chromatography/mass spectrometry. However, due to VOCs' low concentration, collecting and storage of VOCs' samples are challenging. Contaminants from gas sample bag itself may cause higher background and produce unreal analytical results.
Polyfluoro films such as Tedlar and FEP are widely recognized as chemically stable materials. It does not introduce any contaminants and has ultra low permeation property. EPA
Method 18 and EPA TO-14A, TO- 15 recommend the use of polyfluoro film bags to collect and store gases in measurements of gaseous organic compound emissions and volatile organic compounds.
Fittings and valves are usually made of polypropylene, stainless steel or polyfluoro plastic such as PTFE. Some inventors introduced different types of fittings or valves.
Detailed information can be found in US patents:
6055872(Little, Stephen R.), 2007/0269350 Al (Coyne, Linda S.), 4915356(Guild, Lloyd; Guild, Daniel).
A good valve should have following properties: reliable, chemically stable, easy to use, and not introducing contaminants. Unfortunately there are no ideal valves or fittings to meet the rigorous requirements so far. One of the most common drawbacks is that valves have an O-ring inside to prevent leakage. O-ring may produce potential contamination in ultra low concentration analysis such as volatile organic compounds analysis. Some valves need lubricant to prevent leakage. A renovated valve is needed to overcome drawbacks mentioned above.
Summary Of The Invention This invention is regarding to a gas sample bag with two valves, stopcock valve and needle valve. A stopcock valve has a cap with a silicone septum in it. A portion of gas sample can be withdrawn into a syringe for analysis. The stopcock valve comes with an arm that introduces gas sample. A needle valve has a septum that allows a portion of gas to be withdrawn by a syringe. The needle valve also has an arm.
Brief Description of the Drawings Fig. 1 is a gas sample bag with one stopcock valve 1 and one needle valve 2.
Fig. 2 is the section view of valve body.
Fig. 3 is the section view of plug.
Fig. 4 is the section view of stopcock valve in open position.
Fig. 5 is the section view of stopcock valve in close position Fig. 6 is the section view of needle valve body.
Fig. 7 is the section view of needle.
Fig. 8 is the section view of needle valve in close position.
Fig. 9 is the section of needle valve in open portion.
Description Of The Invention The invention provides a gas sample bag that has one stopcock valve and one needle valve. It is convenient to fill gas sample and withdraw gas sample for analysis. The stopcock valve has a septum that is used for withdrawing gas sample for analysis.
The needle valve also has a septum that can be used for withdrawing gas sample for analysis. Both valves have a side arm that can be used for filling gas sample into the gas sample bag. The valves can be turned on and off quickly.
In Fig. 1, the gas sample bag consists of FEP film 4, stopcock valve 1 and needle valve 2.
The stopcock valve 1 comprises two major components, valve body 5 (Fig. 2) and plug 11 (Fig. 3). Plug 11 has a bore 9. A
septum 10 (Fig. 4) is placed into the middle of plug and is secured by a stopper 12 (Fig. 4). Stopper 12 has a needle guide port 13. The stopcock 11 can be rotated.
Valve body 5 has hollow passageway. Upper part of valve body 5 has a larger diameter passageway 24 acts as housing for plug 11. A circular groove 7 and a matching ring 14 (Fig.3) work together to maintain the position of plug 11 after assembling. Lower part of valve body 5 has screws and brim 6.
Valve body 5 is installed on the aperture of gas sample bag film 4 and secured by a nut 3. Valve body 5 has an arm 8 that has a hollow passageway 25 in it. The arm 8 can be connected with a flexible plastic tube to fill gas sample into the bag.
To assemble the stopcock 1, plug 11 is placed into housing 24.
When turning plug 11, bore 9 will be aligned to the passageway 25 in arm 8, therefore the valve is in open position (shown in Fig.4) and gas sample can communicate inside and outside of the bag. Gas sample can be filled into the bag by connecting a flexible silicone tube. When gas sample bag is full, turn plug 11 clockwise or countclockwise by 90 degree, the valve is closed, shown in Fig. 5. During manufacturing process, the surfaces of plug 11 and housing 24 are machined and polished smoothly and contacted each other seamless.
Lubricant is not required for preventing leakage and potential contamination from lubricant is eliminated. The stopcock valve inside doesn't require a rubber O-ring to prevent leakage. There is no possible contamination from the rubber O-ring. A portion of gas sample can be withdrawn through port 13 by a syringe for lab analysis.
Needle valve 2 comprises two major components, valve body 15(Fig.6) and needle 16 (Fig. 7). Valve body 15 has an arm 8 that has a hallow passageway 23 in it and two ends that are threaded. Needle 16 has a narrow bore 17 and U-type threaded cap 19. A plastic sealing ring 18 is attached to the needle body 16. A septum 20 is placed on the top of needle and is secured by a cap 21, which has a needle guide 22 in it (Fig. 8).
When turning U-type cap 19 clockwise, the needle body moves down, and the tip of needle touches the inside bore surface of brim 6. The needle valve is closed (shown in Fig.8). When turning U-type cap 19 count-clockwise, the needle will moves up and gap is formed between conic surface of needle and inside surface of brim 6. Then the valve is open and gas can be filled through valve arm 8 (shown in Fig. 9).
(o
Fig. 4 is the section view of stopcock valve in open position.
Fig. 5 is the section view of stopcock valve in close position Fig. 6 is the section view of needle valve body.
Fig. 7 is the section view of needle.
Fig. 8 is the section view of needle valve in close position.
Fig. 9 is the section of needle valve in open portion.
Description Of The Invention The invention provides a gas sample bag that has one stopcock valve and one needle valve. It is convenient to fill gas sample and withdraw gas sample for analysis. The stopcock valve has a septum that is used for withdrawing gas sample for analysis.
The needle valve also has a septum that can be used for withdrawing gas sample for analysis. Both valves have a side arm that can be used for filling gas sample into the gas sample bag. The valves can be turned on and off quickly.
In Fig. 1, the gas sample bag consists of FEP film 4, stopcock valve 1 and needle valve 2.
The stopcock valve 1 comprises two major components, valve body 5 (Fig. 2) and plug 11 (Fig. 3). Plug 11 has a bore 9. A
septum 10 (Fig. 4) is placed into the middle of plug and is secured by a stopper 12 (Fig. 4). Stopper 12 has a needle guide port 13. The stopcock 11 can be rotated.
Valve body 5 has hollow passageway. Upper part of valve body 5 has a larger diameter passageway 24 acts as housing for plug 11. A circular groove 7 and a matching ring 14 (Fig.3) work together to maintain the position of plug 11 after assembling. Lower part of valve body 5 has screws and brim 6.
Valve body 5 is installed on the aperture of gas sample bag film 4 and secured by a nut 3. Valve body 5 has an arm 8 that has a hollow passageway 25 in it. The arm 8 can be connected with a flexible plastic tube to fill gas sample into the bag.
To assemble the stopcock 1, plug 11 is placed into housing 24.
When turning plug 11, bore 9 will be aligned to the passageway 25 in arm 8, therefore the valve is in open position (shown in Fig.4) and gas sample can communicate inside and outside of the bag. Gas sample can be filled into the bag by connecting a flexible silicone tube. When gas sample bag is full, turn plug 11 clockwise or countclockwise by 90 degree, the valve is closed, shown in Fig. 5. During manufacturing process, the surfaces of plug 11 and housing 24 are machined and polished smoothly and contacted each other seamless.
Lubricant is not required for preventing leakage and potential contamination from lubricant is eliminated. The stopcock valve inside doesn't require a rubber O-ring to prevent leakage. There is no possible contamination from the rubber O-ring. A portion of gas sample can be withdrawn through port 13 by a syringe for lab analysis.
Needle valve 2 comprises two major components, valve body 15(Fig.6) and needle 16 (Fig. 7). Valve body 15 has an arm 8 that has a hallow passageway 23 in it and two ends that are threaded. Needle 16 has a narrow bore 17 and U-type threaded cap 19. A plastic sealing ring 18 is attached to the needle body 16. A septum 20 is placed on the top of needle and is secured by a cap 21, which has a needle guide 22 in it (Fig. 8).
When turning U-type cap 19 clockwise, the needle body moves down, and the tip of needle touches the inside bore surface of brim 6. The needle valve is closed (shown in Fig.8). When turning U-type cap 19 count-clockwise, the needle will moves up and gap is formed between conic surface of needle and inside surface of brim 6. Then the valve is open and gas can be filled through valve arm 8 (shown in Fig. 9).
(o
Claims (3)
1. The gas sample bag comprises FEP film, one stopcock valve and one needle valve for easy operation. This configuration of a gas sample bag can meet the rigorous requirements for volatile organic compounds analysis.
Stopcock valve and needle valve have side arm that can be used to fill gas sample. An elastomer (septum) is mounted on top of each valve for controlling gas flow and permitting a portion of gas sample withdrawn by a syringe.
Both valves do not require an O-ring to prevent leakage from inside of valves due to precision molding manufacturing process.
Stopcock valve and needle valve have side arm that can be used to fill gas sample. An elastomer (septum) is mounted on top of each valve for controlling gas flow and permitting a portion of gas sample withdrawn by a syringe.
Both valves do not require an O-ring to prevent leakage from inside of valves due to precision molding manufacturing process.
2. In the invention of Claim 1, wherein the stopcock valve has a circular groove and a matching ring that work together to maintain the position of stopcock after assembling.
3. In the invention of Claim 1, wherein the needle valve has flow control component called needle. The needle tip is molded to conic surface. Sealing is created when the conic surface of needle tip touches the inside surface of lower valve body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2685449 CA2685449A1 (en) | 2009-08-13 | 2009-08-13 | Gas sample bag with two valves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2685449 CA2685449A1 (en) | 2009-08-13 | 2009-08-13 | Gas sample bag with two valves |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2685449A1 true CA2685449A1 (en) | 2011-02-13 |
Family
ID=43603023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2685449 Abandoned CA2685449A1 (en) | 2009-08-13 | 2009-08-13 | Gas sample bag with two valves |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2685449A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015132601A1 (en) * | 2014-03-06 | 2015-09-11 | Endet Limited | Sampling device |
| CN105221821A (en) * | 2014-07-04 | 2016-01-06 | 唐慧锋 | Seal ring moves around and controls the gas sampling bag valve of side direction air nozzle |
| CN105221821B (en) * | 2014-07-04 | 2019-07-16 | 唐慧锋 | Sealing ring moves back and forth the gas sampling bag valve for controlling lateral air nozzle |
-
2009
- 2009-08-13 CA CA 2685449 patent/CA2685449A1/en not_active Abandoned
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015132601A1 (en) * | 2014-03-06 | 2015-09-11 | Endet Limited | Sampling device |
| US20170030809A1 (en) * | 2014-03-06 | 2017-02-02 | Endet Limited | Improvements in or relating to fluid sampling |
| CN105221821A (en) * | 2014-07-04 | 2016-01-06 | 唐慧锋 | Seal ring moves around and controls the gas sampling bag valve of side direction air nozzle |
| CN105221821B (en) * | 2014-07-04 | 2019-07-16 | 唐慧锋 | Sealing ring moves back and forth the gas sampling bag valve for controlling lateral air nozzle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |
Effective date: 20130411 |