Bore sizes of ballcock/floatvalve 'seats'.

ThisIsWeird

Hi.

The replaceable nozzle - 'seat' - in standard 1/2" ballvalves, any idea what the actual bore sizes are?

They usually come in white and red, with white being the 'high' pressure, and red for 'low'. But I've also seen green, with a 9.5mm bore. I'm guessing that's extra-low?

This is for a Grundfos HomeBoost pumped accumulator, which fills via a standard 1/2" ballvalve. Grundfos say the seat can be replaced to suit different supply pressures. They say the standard fitment has a 3.2mm bore - any idea if that the 'white' version?

EDIT: Yes, it seems the white is ~3mm bore. Any idea what the red is?! To see how it compares with the green.

Ta.

Rodders53

Here you go...  You may need to convert from inches to millimetres...

https://www.thomasdudley.co.uk/tyde/category/ballvalve-seating/

Section62

I've just looked at a Delchem one I've got.  It is stamped "6x11", but the actual bore size measures 6.2mm.  So nominal 6mm.

Rodders53

Thomas Dudley site numbers are:

White 1/8 inch  (3.175 mm) for high pressure

Black 3/16 inch (4.7625 mm) for medium pressure

Red 1/4 inch (6.3 mm) for low pressure

Green 3/8 inch (9.525 mm) for ultra low pressure

There will be manufacturing tolerances on all those numbers, of course;  but all will have been imperial measurements when 'invented'.

Choice will be to suit a sensible fill rate with the pipework to the ballcock valve and water pressure available.

ThisIsWeird

Perfect, gents - thank you.