BS EN 16767:2020

This document specifies the general requirements for metallic check valves, which are forged, cast or fabricated in straight, angle or oblique pattern (see EN736?2) with end connections flanged or wafer, butt welding, socket welding, or threaded.This document applies to metallic check valves used for all industrial applications.Additional requirements given in the relevant application standards may apply to check valves used for more specific applications (e.g. for the water industry, the chemical and petrochemical process industry, the gas distribution industry).Sanitary check valves and back flow prevention anti-pollution check valves are excluded from the scope of this document. NOTE1 Double disc type and tilting disc type are also based on butterfly valve and are in the scope of this document.The range of nominal sizes covered is: DN8, DN10; DN12, DN15; DN20; DN25; DN32; DN40; DN50; DN65; DN80; DN100; DN125; DN150; DN200; DN250; DN300; DN350; DN400; DN450; DN500; DN600; DN700; DN750; DN800; DN900; DN1000; DN1200. DN8 and DN12 are not used for PN designated flanged end connections.DN8, DN10 and DN12 are not used for Class designated flanged end connections.DN750 is used for Class designated check valves only.Socket welding end check valves and threaded end check valves are limited to the range DN8 to DN65.The range of nominal diameters for capillary and compression end valves is 6mm to 110mm.The range of pressure designations covered is: for flanged end and wafer type end cast iron bodies: PN2,5; PN6; PN10; PN16; PN25; Class125; Class250; for flanged end, wafer type and butt welding end bodies in steel materials: PN2,5; PN6; PN10; PN16; PN25; PN40; PN63; PN100; PN160; PN250; PN320; PN400; Class150; Class300; Class600; Class900; Class1500; Class 2500; for socket welding end and threaded end bodies in steel materials: PN40; PN63; PN100; Class600; Class800. NOTE2 Class800 is a widely used Class designation for socket welding and threaded end check valves. for flanged end and wafer type bodies in copper alloy materials: PN2,5; PN6; PN10; PN16; PN25; PN40; Class150; Class300; for threaded end, capillary end and compression end bodies in copper alloy materials: PN16; PN20; PN25; PN32; PN40; Class125; Class250. The correspondence between DN and NPS is given for information in AnnexB.