The cold water inlet valve to the water heater is closed.
It exerts pressure on the side with a higher concentration of water.
High side and low side refer to the pressure in the ac system. Ie The high side is the high pressure line and low side is the low pressure line.
water pressure from the main or pump , side is greater that the lowest setting on the pressure valve, causing the diafram to viberate,
that is a bit on the low side.
Install on cold water line.
We had the same problem. If you have low water pressure coming into your house this will affect the amount of water going into your ice maker.
High Pressure
Yes you can. A dry standpipe system has an air pressure and a water gauge the air pressure gauge is normally found on the top or the (pressure side) the water gauge is normally located on the bottom under the air pressure gauge or the (supply side)
The process for desalinization is reverse osmosis. The salty fluid is put on the pressurized side of the semi-permeable membrane and the salt free water oozes to the low pressure side. The pressure overcomes the "osmotic pressure" noted in regular osmosis.
osmotic pressure
Soapy Water
Hydrostatic.