D230W Double Non-Return Valve

To BS EN 1092-2 and BS EN 3692.

The Water Regulations Advisory Scheme (WRAS).

Guidance for specification option:

• These valves are not intended to be used as backflow prevention devices conforming to Schedule 2 Section 6 of the WRAS Water Regulations Guide.
• Two suitably approved single check valves (Type EA device) installed in series are accepted as offering the equivalent level of protection as that afforded by a double check valve (Type EC device) providing the maximum distance between the adjacent flanges of the valves did not exceed twice their nominal bore and the operation of one component does not interfere with the operation of the other.

Non-return valve.

Cast iron 1 EN-GJL-250, Steel (zinc plated) Grade 8.8 / 8, Stainless steel 316/304, Fusion bonded epoxy cast iron 1561 EN-GJL-250, EPDM, Stainless steel 304 (1.4301) and Brass 12164 CW611N.

Guidance for specification option:

Body, Guide: Cast iron; Disc: Fusion bonded epoxy cast iron; Seat, Gasket: EPDM; Spring, Stem, Plug 1/4": Stainless steel; Bushing: Brass; Stud, Nut: Steel.

16 BAR.

Manufacturer's standard.