In 2017 FM approvals introduced a low-pressure friction loss test for pressure reducing hose valves, and in light of this all manufacturers were de-listed from the FM Guide.
In-order to pass the FM friction loss test some manufacturers simply reduced the valve outlet from 2.5’’ to 1.5’’ and then with a significantly reduced flow rate (100 gpm) were able to pass the test and re-establish FM approval.
We, mindful of our clients requirements to BS5041 Part 1, where water flow rate through the valve shall not be less than 8.5 L/s (510 lpm) and the outlet pressure shall not be less than 4 bar when the inlet pressure is 4.7 bar, resubmitted to FM approvals the Knowsley HoseSafe Model 2130, an Oblique pattern valve incorporating a true 2.5’’ outlet and rated for 250 gpm (946 lpm).
