Valved NMR Sample Tubes for High Pressure

 

Cautionary Note: Glass can be an unpredictable material, especially if it has been scratched or subjected to
rough handling. As such, EXTREME CAUTION should be exercised when using glass at elevated pressure or temperature, because it has the potential to fail suddenly and catastrophically. Therefore, anyone attempting to use glass components, such as NMR sample tubes at elevated or reduced pressures and/or temperatures should ensure that adequate personal protection, such as explosion shields, full face coverage shields, heavy gloves, etc., are employed to protect oneself against flying glass fragments if a glass component fails explosively.

Norell, Inc. is pleased to introduce another addition to the Valved NMR Sample Tubes product line. This latest addition, featuring a High Pressure Valve constructed entirely from glass and fluoropolymer, can be permanently joined to your choice of a wide array of NMR sample tubes.

These pressure tubes facilitate experiments requiring conditions such as pressurized inert atmosphere blanketing, addition of reactive gaseous reagents under pressure, containment of low boiling solvents or samples at elevated temperatures and so on.

The valve design includes significant improvements not found in similar versions from other manufacturers.

The Norell High Pressure Valve requires no special tools or tubing preparation procedures prior to use. Secure, leak-free connections to standard 1/8" O.D. laboratory instrumentation pressure tubing need only be made finger- tight, unlike competitor's versions that often leak at this connection point even after tightening with a wrench.

We supply the necessary components of the compression tube fitting (consisting of a compression nut, ferrule and gripper) with the High Pressure Valve assembly, whereas other manufacturers do not. The special compression fittings do not permanently attach to the pressure line. This permits removal and reuse in other locations or connection to different gas supplies without installing dedicated metallic double ferrule fittings at each point of use.

We also include a short length of 1/8" O.D. Type 316 stainless steel tube to provide versatility when making pressure connections.

For instance, the tube may be inserted into a flexible 1/8" I.D. braid-reinforced PVC or other pressure hose, and secured with a small worm-drive hose clamp.

The supplied tube can also be permanently attached to an optional 1/8" Type 316 stainless steel union (shown in the accompanying illustration, not included with the basic valve purchase but available separately as Item Number HPV-1/8X1/8-UNION) to form a secure, leak-proof transition to metallic double ferrule or Swagelok type fittings, such as may be present on an existing pressure line.

Lastly, a new 1/8" O.D. pressure supply line, having no permanently affixed fittings or ferrules, may be coupled directly to the High Pressure Valve utilizing the supplied compression nut and components.

The included compression fitting components seal equally well on both metallic and non-metallic tubing, permitting use with stainless steel, brass or other metallic tubing as well as highly inert and chemically resistant non-metallic tubing such as heavy wall PTFE.

Likewise, the valve stem, or piston, of the High Pressure Valve, also composed of PTFE fluoropolymer, is completely inert and resists virtually all solvents, reactive chemicals and reagents, and deterioration induced by corrosive conditions. The PTFE stem incorporates a wiper portion that serves as the primary seal, while a fluoroelastomer o-ring forms a secondary backup seal, protected by the primary PTFE wiper seal.

The sample tube portion, manufactured from ASTM Type 1 Class A glass (Pyrex® or an equivalent) tolerates a maximum temperature of about 230°C, and resists sudden temperature changes, or thermal shock, very well without breakage, but sudden temperature changes should be restricted to a range of 120°C or less.

The glass shell of the high pressure valve, also formed from ASTM Type 1 Class A glass, matches that of the sample tube, thereby minimizing breakage of the joint caused by internal strain or thermal shock.

The Norell High Pressure Valve remains compatible with and can be connected to existing metallic double ferrule compression tube fittings, such as Swagelok®, Parker A-LOK®, Yor-Lok®, Let-Lok® and other brands, but completely leak free connections cannot be guaranteed when used with these types of metallic fittings.

We have found that metallic double ferrule fittings cannot seal well to softer materials such as PTFE. Normally this should not present a problem when using innocuous gases such as argon or nitrogen, for instance, but a potential problem arises when using corrosive, toxic, flammable or otherwise hazardous gases. Therefore, with the basic valve purchase, we include the special sealing components to ensure an effective seal when working with potentially hazardous materials.

We recommend that the maximum operating pressure should be limited to 1400 kPa (14 bar, 200 psi) when using this valve with a 5 mm O.D. heavy wall tube. (Please see accompanying table for complete details.)

The accompanying tables present a selection of 3mm, 5mm and 10mm O.D. NMR tubes joined to the High Pressure Valve, but other lengths, additional MHz ratings and tube materials (such as quartz) are available. Please feel free to request a quote for your custom requirements, as we are continually striving to provide the utmost service and satisfaction to our customers!

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3mm High Pressure Valved NMR Sample Tubes

Item No MHz Tube Length
(mm)
I.D. mm
(Volume μL/cm)
Tube
Wall
Reommended Maximum Operating Pressure
kPa bar psi
S-3-300-HPV-7 300 178 2.41 (46) thin 960 9.6 140
S-3-300-HPV-8 300 203 2.41 (46) thin 960 9.6 140
S-3-400-HPV-7 400 178 2.41 (46) thin 960 9.6 140
S-3-400-HPV-8 400 203 2.41 (46) thin 960 9.6 140
S-3-500-HPV-7 500 178 2.41 (46) thin 960 9.6 140
S-3-500-HPV-8 500 203 2.41 (46) thin 960 9.6 140
S-3-600-HPV-7 600 178 2.41 (46) thin 960 9.6 140
S-3-600-HPV-8 600 203 2.41 (46) thin 960 9.6 140
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5mm High Pressure Valved NMR Sample Tubes

Item No MHz Tube Length
(mm)
I.D. mm
(Volume μL/cm)
Tube
Wall
Reommended Maximum Operating Pressure
kPa bar psi
S-5-300-HPV-7 300 178 4.20 (138) thin 700 7 100
S-5-300-MW-HPV-7 300 178 3.43 (92) medium 1050 10.5 150
S-5-300-HW-HPV-7 300 178 2.20 (38) heavy 1400 14 200
S-5-300-HPV-8 300 203 4.20 (138) thin 700 7 100
S-5-300-MW-HPV-8 300 203 3.43 (92) medium 1050 10.5 150
S-5-300-HW-HPV-8 300 203 2.20 (38) heavy 1400 14 200
S-5-400-HPV-7 400 178 4.20 (138) thin 700 7 100
S-5-400-MW-HPV-7 400 178 3.43 (92) medium 1050 10.5 150
S-5-400-HW-HPV-7 400 178 2.20 (38) heavy 1400 14 200
S-5-400-HPV-8 400 203 4.20 (138) thin 700 7 100
S-5-400-MW-HPV-8 400 203 3.43 (92) medium 1050 10.5 150
S-5-400-HW-HPV-8 400 203 2.20 (38) heavy 1400 14 200
S-5-500-HPV-7 500 178 4.20 (138) thin 700 7 100
S-5-500-MW-HPV-7 500 178 3.43 (92) medium 1050 10.5 150
S-5-500-HW-HPV-7 500 178 2.20 (38) heavy 1400 14 200
S-5-500-HPV-8 500 203 4.20 (138) thin 700 7 100
S-5-500-MW-HPV-8 500 203 3.43 (92) medium 1050 10.5 150
S-5-500-HW-HPV-8 500 203 2.20 (38) heavy 1400 14 200
S-5-600-HPV-7 600 178 4.20 (138) thin 700 7 100
S-5-600-MW-HPV-7 600 178 3.43 (92) medium 1050 10.5 150
S-5-600-HW-HPV-7 600 178 2.20 (38) heavy 1400 14 200
S-5-600-HPV-8 600 203 4.20 (138) thin 700 7 100
S-5-600-MW-HPV-8 600 203 3.43 (92) medium 1050 10.5 150
S-5-600-HW-HPV-8 600 203 2.20 (38) heavy 1400 14 200
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10mm High Pressure Valved NMR Sample Tubes

Item No MHz Tube Length
(mm)
I.D. mm
(Volume μL/cm)
Tube
Wall
Reommended Maximum Operating Pressure
kPa bar psi
S-10-500-HPV-7 500 178 9.10 (650) thin 520 5.2 75
S-10-500-HPV-8 500 203 9.10 (650) thin 520 5.2 75
S-10-600-HPV-7 600 178 9.10 (650) thin 520 5.2 75
S-10-600-HPV-8 600 203 9.10 (650) thin 520 5.2 75
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Accessories for HIgh Pressure Valved NMR Sample Tubes

Item Number Description
HPV-1/8X1/8-UNION Optional Union Adapter, Type 316 Stainless Steel, for 1/8" metallic double ferrule line termination
HPV-1/4-WRENCH Wrench, 1/4" double open-end, 15° and 75° angled openings, forged steel
To Order:
Phone: 828.584.2600
Fax: 828.584.2604
Email customerservice@nmrtubes.com.