please evaluate system idea
please evaluate system idea
(OP)
We apply adhesive to our product from pressure pots. Currently, when the pressure pot is nearly empty, prduction is stopped so more adhesive can be pumped into the pressure pot.
My proposed system would connect a pump to the glue pot. The pots are pressurized to about 60psi. The pump would supply glue at about 90psi. A float would shut off a valve in the supply line to the pump. The pump would then deadhead and shut-off. A relief valve would allow exess pressure to escape from the pressure pot.
Do you think this system will work?
My proposed system would connect a pump to the glue pot. The pots are pressurized to about 60psi. The pump would supply glue at about 90psi. A float would shut off a valve in the supply line to the pump. The pump would then deadhead and shut-off. A relief valve would allow exess pressure to escape from the pressure pot.
Do you think this system will work?





RE: please evaluate system idea
:( fouling of the float by the glue in the pot,
:( increased glue flowrate during pumping due to higher backpressure (90 cf 60) across the discharge nozzle
:( control wiring access (wrt sealing against pressure)
Good Luck!
RE: please evaluate system idea
RE: please evaluate system idea
BobPE
RE: please evaluate system idea
Here's a trick we've used refiling an operating pressure dispense vessel without additional pumps. Configure a site glass using two three-way diverter valves. The common legs of the diverter valves connect to the site glass. The three ways are pneumatically tied together and operate simultaneously. In the Normal position the site glass is connected to the PV. In the actuated position the bottom for the site glass connects to the supply while the top vents to atmosphere (or returns to the supply drum). The site glass fills with liquid from the supply and when the system switches back to the Normal position gravity balances the liquid level between the PV and the site glass. This process repeats frequently maintaining a nearly constant level in the dispense PV with no noticeable dispense pressure fluctuations or flow rate changes at the nozzle.
Hope this helps --
RE: please evaluate system idea
Another idea:
Add another pressure pot and switch between them. While using one pot another could be filled. Use a three way valve between them and the use point.
One problem with pumping into a pressure pot may be the change in pressure. If the pressure changes the flow will change. If you use a pump and pump into the pressure pot the pressure in the pot should be controlled so there is a minimum variation. As previouisly suggested a bladder tank may provide enough extra air capacity to that the volume of adhesive added will not change the pressure very much.
A persistaulic pump as suggested or a diaphragm pump may be suitable if sheer in the adhesive is a problem, if not, a gear pump would be a good choice.
RE: please evaluate system idea