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Dual Component Dispensing Station with DTV technology
 Description: In order to get accurate dispensing from a cartridge based system it is important to keep the cartridge under pressure and have some sort of outlet valving controlling the shot. Otherwise, without the valving, the cartridge will balloon and shrink each time it is pressurized. It is during this ballooning that the shot being dispensed may be off-ratio. If both sides balloon at different rates the flow from each cavity will not be synchronized and therefore the ratio is inconsistent. This can be very significant if one is dispensing a small shot. Every shot will be affected.
To overcome this phenomenon an outlet valve is required. The cartridge is pressurized once so it is fully expanded, and the outlet valve opens and closes as required to make the deposit. This ensures an accurate ratio. A controller with a timer can be used to open and close the valve for a programmable amount of time to determine the shot size. Typically, single component pinch-tube type valves have been used to provide the valving function. These are fitted on the end of special static mixers with luer-locking devices. The tube that runs through the pinch-tube valve is continuous so that the valve is not contaminated with reactive resin. At the end of the run the static mixer and pinch tube are removed and discarded.
Environmental issues being what they are today everybody is trying to minimize waste. This is where out DTV technology comes in. Our "DTValve" is a very small dual component valve that receives liquids from dual cartridges and keeps them apart until it presents them to the mixer. The mixer becomes the only disposable component.
This is a very simple valve with one moving part and two O Ring seals. The fluid paths through the valve are disposable. They can be changed quickly should they become contaminated with mixed resin. This generally happens inadvertently if the cartridge preparation and "burping" procedures are not followed correctly.
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