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29-11-2018 #1
I'm trying to work out exactly what the purpose of this valve assembly is.
It was attached to the body of a spindle on a gantry cnc router.
Clearly it is supposed to direct either air or coolant to the cutter, BUT, it has two pipe connections, one with a valve (actually it's a Meter-in speed controller valve) and one without.
The pipe connector on the right of the block, without the valve, has a pipe running back to a electricly operated valve which has another length of pipe from it which is just floating about free.
Obviously I can connect the electric solenoid valve to compressed air and have an air jet blowing onto the cutter, but whats the purpose of the valve on the cutter end?
I wondered if it would allow coolant to be drawn up via another pipe to give a mist?
I'm not sure the meter-in speed controller valve is meant to have liquid in it.
I can just bin this assembly and run a flood coolant with a small submersible pump instead. It might be useful to keep as an air blast for use on wood, mdf etc?Last edited by Richard; 29-11-2018 at 06:37 PM.
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29-11-2018 #2
It's a venturi setup for mist coolant. The metered inlet would connect to a container of suitable coolant.
Avoiding the rubbish customer service from AluminiumWarehouse since July '13.
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29-11-2018 #3
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29-11-2018 #4
It depends on how it's been designed. If it is a venturi, then it should create a vacuum and draw fluid out an unpressurised container.
However it's maybe not a venturi, in which case it does need the fluid to be pressurised.
Only way to find out, is connect it to a suitably regulated air supply, and see if it sucks or not.Avoiding the rubbish customer service from AluminiumWarehouse since July '13.
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29-11-2018 #5
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30-11-2018 #6
The top one is probably the air inlet as it has a valve on it.
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30-11-2018 #7
What pressure did you use?
If it is a venturi, and you used too high a pressure, the restriction of the outlet would cause it to blow air out the coolant inlet, instead of creating a vacuum.
Most of these things are designed to run around 1-3bar, so start with a pressure regulator fully wound off, then gradually increase the pressure.Avoiding the rubbish customer service from AluminiumWarehouse since July '13.
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