The purpose of this document is to specify:
-- field of application of anti-pollution check valves;
-- backflow prevention properties, dimensional and physio-chemical properties, and properties of general hydraulic, mechanical and acoustic design for anti-pollution check valves of nominal sizes DN 6 to DN 250 inclusive;
-- family E, type A, controllable anti-pollution check valve (with test port);
-- family E, type B, non-controllable anti-pollution check valve, including cartridge check valve;
-- family E, type C, controllable anti-pollution double check valve (with test ports);
-- family E, type D, non-controllable anti-pollution double check valve, including cartridge double check valve;
-- test procedures and requirements for verifying the backflow protection properties of stop valves, draw-off taps etc. which incorporate a check valve function. Stop valves, draw off taps etc, need also to comply with a recognised standard;
-- marking;
-- presentation at delivery.
This document specifies the characteristics of anti-pollution check valves of DN 6 up to and including DN 250 that are suitable for use in drinking water systems. For application feasibility see Table 1.