the pharmaceutical industry the product is available with the option of
FDA approved PTFE seats and seals.
BS EN 10204 3.1b certification can be requested at the time of order.
If the valve
is to be installed in a horizontal line then a spring is not required.
shut off can be achieved with a
PTFE seat at 6.9 bar and a Viton
seat at 0.7 bar.
In all sizes
from DN8 to DN50 the cracking pressure of the K44 'Checktite' valve is
in the vertical position it is nominally 7 mbar.
horizontal position this falls away to less than 4 mbar.
return spring is fitted these figures increase by approximately 20 mbar.