Need Help To Stop Fluids Flow After Volume X. 2

[eldracm61]

For some time I have struggled to find a system to permanently stop the flow of fluids through a micro pipe [2 mm] after the required volume has passed through. The micro pipe is not to be used again [contamination issues], so the "break" must be final, permanent.

I cannot just replace the micro pipe. It has to be rendered non-usable.

Any ideas?

 

[israelkk]

More information on the system is needed. Can you pinch the pipe and resistance weld it? Can you pinch it, cut it and bend? What is the pressure inside the pipe? What is the fluid, gas? etc.

 

[ApC2Kp]

eldracm61,
The 2mm micropipe certainly is not typical piping. Besides the info that is asked by israelkk, what is the material of the micropipe? Does it become the package for the product volume? What is expected to open up the package later? How many of these are to be 'stopped' and rendered non-usable?
Another method for closing off the ends might be using tapered plugs pressed into the ends of micropipe. A fixture is visualized that would look like an angle globe valve with the valve stem pushing a tapered plug into the end of a micropipe held where the valve seat is normally located. Another tapered plug could be at the fixed seat of this press fixture. All of this fixture could have flow to fill the microtube and plug the ends.

 

[MikeHalloran]

To mechanically seal soft refrigeration tube, techs use a vise- grip type tool that presses a cylinder against a mating hemicylindrical die.

Oriented across the tube, it forms a 'pinch' that can be reopened with some difficulty.

Oriented along the tube, it caves in one wall completely and folds it against the opposing wall, making a permanent closure. You may find such tools' tracks on the charging pigtail of a hermetic compressor.

Perhaps a smaller version could be fabricated.



Mike Halloran
NOT speaking for
DeAngelo Marine Exhaust Inc.
Ft. Lauderdale, FL, USA

 

[unclesyd]

Make a visit to an electrical supply store or Home Depot type and look the electrical connector crimping tools. Look at the one with replaceable dies so you will be able to modify if needed. They have compound and ratchet types for additional leverage.

I wouldn't be surprised if Swagelock and the like didn't have one.

 

[unclesyd]

Forgot to add that if there is possibility of cutting the tubing just a metal sleeve at the point of the crimp.

There are also production types that are pneumatically operated and can be set to give specific thickness crimp no danger of cutting the tube.