Providing outstanding safety equipment, consultancy and expertise for your company.
Because safety is a necessity, not a commodity

Tel: 01332 673700 Mobile: 07968 512311 Email: neilfinney@derwentjames.co.uk

No bottle No Flow – NEW Dopak feature

Hazardous Chemical Sampling Systems

Dopak sampling systems; the world wide experts in closed loop hazardous chemical sampling systems have developed a new safety feature which is now available for selection on all new sampling systems and can be retrofitted to existing Dopak sampling systems – Dopak no bottle no flow

No Bottle No Flow

The new “No bottle no flow” feature offers the user an increased safety feature when sampling hazardous liquid chemicals preventing sampler operation unless a sample bottle is in place.

This new needle assembly design can be specified right now and is available on short delivery from Dopak.  The new Dopak NBNF needle assembly can be specified as part of your new sampler design OR can be ordered as a spare part and retrofitted to existing Dopak sampling systems already out in the field.

How does it work?

OFF POSITION – Without the sample bottle in place the VTO-NBNF is closed.

SAMPLE POSITION – When the sample bottle is pushed into place, the VTO-NBNF is automatically opened. In this position the required sampling operation can be performed to allow product to flow into the bottle.

OFF POSITION – When the sample operation is finished, the bottle can be removed.The VTO-NBNF will close automatically.

NBNF – Ordering details

To order the Dopak NBNF needle assembly for retrofitting to your existing sampler simply contact Derwent James Ltd using the following part numbers;

Dopak part Number 2017851

  • VTO needle assembly type NBNF (no bottle no flow)
  • Process needle id: 1.35mm
  • Vent needle id: 1.35mm
  • Process connection: 1/4″M  NPT
  • Vent connection: 1/4″ M NPT
  • Body materials: SS316
  • O-ring material: Viton

Dopak part number 2017852

  • VTO needle assembly type NBNF (no bottle no flow)
  • Process needle id: 3.00mm
  • Vent needle id: 3.00mm
  • Process connection: 1/4″M  NPT
  • Vent connection: 1/4″ M NPT
  • Body materials: SS316
  • O-ring material: Viton

NBNF – Materials

The NBNF is standard available in SS316 and also a range of special alloys on request.
Standard O-ring material is Viton although Kalrez (FFKM) is also available on request.

NBNF – more information?

When specifying the NEW NBNF needle assembly for a new system simply mention this new feature in your discussions with us and we’ll be sure to include it in the design.  If you would like to see an example of the needle assembly then we have one here in the UK for you to see or you can download a datasheet here >>> LINK

Any further questions then do get in touch.


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Providing outstanding safety equipment, consultancy and expertise for your company.
Because safety is a necessity, not a commodity

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