This is what Ziggity has to say:
http://www.ziggity.com/pdf/cont/cont_document_pdf_pdf_93.pdf/Broiler_Applications.pdf
"Day 1 – Week 1 Adjust column pressure setting to the absolute minimum. (No greater than 2 in./5 cm) Do not change this setting even if the litter is totally dry."
Also from Ziggity:
"Virtually all manufacturers of nipple-type drinkers without catch cups recommend minimum pressure settings for day-old chicks. Most manufacturers recommend settings below 10 cm to start, while Ziggity Systems recommends only 2.5 to 5 cm (1 to 2 inches) of column height pressure in order to ensure dry litter from the very start."
Quote:
Because there is greater water pressure behind it. It's like a detent ball with a heavier spring behind it, except unlike a spring once the ball is unseated it is free to move in the water, but it takes a greater amount of force to unseat it to begin with. When the birds are pecking at the line, the entire line vibrates and can cause other nipples to leak a little due to the balls coming unseated. At very low pressures the balls are more likely to come unseated and drip a little.
https://utextension.tennessee.edu/publications/Documents/pb1533.pdf
"Keep water pressure low when chicks are young so that water will flow easily from the nipple when it gets activated by the lightest touch."
http://www.ziggity.com/pdf/cont/cont_document_pdf_pdf_93.pdf/Broiler_Applications.pdf
"Day 1 – Week 1 Adjust column pressure setting to the absolute minimum. (No greater than 2 in./5 cm) Do not change this setting even if the litter is totally dry."
Also from Ziggity:
"Virtually all manufacturers of nipple-type drinkers without catch cups recommend minimum pressure settings for day-old chicks. Most manufacturers recommend settings below 10 cm to start, while Ziggity Systems recommends only 2.5 to 5 cm (1 to 2 inches) of column height pressure in order to ensure dry litter from the very start."
Quote:
Because there is greater water pressure behind it. It's like a detent ball with a heavier spring behind it, except unlike a spring once the ball is unseated it is free to move in the water, but it takes a greater amount of force to unseat it to begin with. When the birds are pecking at the line, the entire line vibrates and can cause other nipples to leak a little due to the balls coming unseated. At very low pressures the balls are more likely to come unseated and drip a little.
https://utextension.tennessee.edu/publications/Documents/pb1533.pdf
"Keep water pressure low when chicks are young so that water will flow easily from the nipple when it gets activated by the lightest touch."