CEN/TC 69/WG 6 - Check valves

This European Standard specifies the requirements for cast iron or steel check valves, which are forged, cast or fabricated in straight, angle or oblique pattern (see EN 736-2) with end connections flanged or wafer, butt welding, socket welding, or threaded.
This European standard applies to check valves mainly used for industrial and general purpose applications. However, they may be used for other applications provided the requirements of the relevant performance standards are met.
Back flow prevention anti-pollution check valves are outside the scope of this European standard.
The range of nominal sizes covered is:
DN 8, DN 10; DN 12, DN 15; DN 20; DN 25; DN 32; DN 40; DN 50; DN 65; DN 80; DN 100; DN 125; DN 150; DN 200; DN 250; DN 300; DN 350; DN 400; DN 450; DN 500; DN 600; DN 700; DN 750; DN 800; DN 900; DN 1000.
DN 8 and DN 12 are not used for PN designated flanged end connections.
DN 8, DN 10 and DN 12 are not used for Class designated flanged end connections.
DN 750 is used for Class designated valves only.
Socket welding end valves and threaded end valves are limited to the range DN 8 to DN 65.
The range of pressure designations covered is:
a)   for flanged end and wafer type end cast iron bodies:
-   PN 2,5; PN 6; PN 10; PN 16; PN 25;
-   Class 125; Class 250;
b)   for flanged end, wafer type and butt welding end steel bodies:
-   PN 40; PN 63; PN 100;
-   Class 150; Class 300; Class 600;
c)   for socket welding end steel bodies and threaded end steel bodies:
-   PN 40; PN 63; PN 100;
-   Class 600; Class 800.
NOTE   Class 800 is a widely used Class designation for socket welding and threaded end valves.

This European Standard specifies the requirements for steel check valves, which are forged, cast or fabricated in straight, angle or oblique pattern (see EN 736 2) with end connections flanged or wafer, butt welding, socket welding, or threaded.
This standard is applicable to steel check valves mainly used for industrial and general purpose applications. However, they can be used for other applications provided the requirements of the relevant performance standards are met.
Back flow prevention anti-pollution check valves are outside the scope of this standard.
The range of nominal sizes covered is:
   DN 8; DN 10; DN 12; DN 15; DN 20; DN 25; DN 32; DN 40; DN 50; DN 65; DN 80; DN 100; DN 125; DN 150; DN 200; DN 250; DN 300; DN 350; DN 400; DN 450; DN 500; DN 600; DN 700; DN 750; DN 800; DN 900; DN 1000.
DN 750 is used for Class designated valves only.
DN 8 and DN 12 are not used for PN designated flanged end connections.
DN 8, DN 10 and DN 12 are not used for Class designated flanged end connections.
Socket welding end valves and threaded end valves are limited to the range DN 8 to DN 65.
The range of pressure designations covered is:
a)   for flanged end, wafer type and butt welding end valves:
PN 10; PN 16; PN 25; PN 40; PN 63; PN 100;
Class 150; Class 300; Class 600.
b)   for socket welding end valves and threaded end valves:
PN 40; PN 63; PN 100;
Class 600; Class 800.
NOTE   Class 800 is a Class designation widely used for socket welding and threaded end valves.

This European Standard specifies requirements for cast iron check valves having flanged end connections or wafer type bofy, with either metallic or resilient seating, in nominal sizes DN40 to DN1000 and nominal pressure ratings PN6 to PN40, Class 125, and Class 250 and in pivoting, linear, diaphragm or ball type.

This European Standard specifies requirements for cast iron check valves having flanged end connections or wafer type bofy, with either metallic or resilient seating, in nominal sizes DN40 to DN1000 and nominal pressure ratings PN6 to PN40, Class 125, and Class 250 and in pivoting, linear, diaphragm or ball type.

This European Standard specifies requirements for cast iron check valves having flanged end connections or wafer type bofy, with either metallic or resilient seating, in nominal sizes DN40 to DN1000 and nominal pressure ratings PN6 to PN40, Class 125, and Class 250 and in pivoting, linear, diaphragm or ball type.