A Low Pressure Ball Float Valve is provided with a larger hole within the valve assembly (looking down inside the threaded end) to fill the tank or cistern up more quickly, however if the water pressure is too high this will result in excessive noise or water hammer. Conversely if a high pressure ballcock valve or insert (with small hole) is used the cistern (or tank) will take a long time to fill.
The below image shows the red low pressure float valve nozzle with the hole measuring approximately 5mm and white low pressure float valve nozzle with the hole measuring approximately 2mm
High pressure and low pressure float valves, Part 1 and 2, and replacement nozzles are available using the following linkFloat Valves from On-Demand Supplies
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