What is BS EN 558 - PN and Class designated metal valves about?
BS EN 558 is a European standard on industrial valves that focuses on the dimensions of metal valves that helps in controlling the flow of gas or liquid through piping systems.
BS EN 558 specifies the “face-to-face” (FTF) and “centre-to-face” (CTF) dimensions for PN and Class designated metal valves used in flanged pipe systems.
NOTE: BS EN 558 covers valves with the following PN, Class and DN values:
- PN 2,5; PN 6; PN 10; PN 16; PN 25; PN 40; PN 63; PN 100; PN 160; PN 250; PN 320; PN 400
- Class 125; Class 150; Class 250; Class 300; Class 600; Class 900; Class 1 500; Class 2 500
- DN 10; 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 1 000; DN 1050; DN 1 200; DN 1 400; DN 1 600; DN 1 800; DN 2 000.
For valves in other shell materials than metal, the same FTF and CTF dimensions may be used.
Who is BS EN 558 - PN and Class designated metal valves for?
BS EN 558 on industrial valves is relevant to:
- Builders
- Manufacturers and suppliers of industrial valves
- Manufacturers and suppliers of piping components
- Fluid equipment designers and manufacturers
- Gas and oil processing industries.
Why should you use BS EN 558 - PN and Class designated metal valves?
A valve is an electro-mechanical device that regulates, controls, or directs the flow of a fluid by opening, closing, or partially obstructing fluid flow.
BS EN 558 provides the basic series of FTF and CTF dimensions and tolerances for class designated valves with ring joint flanges, valves with lining and raised face flanges.
BS EN 558 navigates you through the tolerances of parallelism or perpendicularity of PN and Class designated valves.
BS EN 558 specifies the tolerances of butterfly valves and butterfly control valves, ball and plug valves, diaphragm valves, globe valves and check valves that act to stop or start media flow.
Furthermore, BS EN 558 could lead you through the designing of industrial valves that are built to withstand high pressure, either from fluid or gas and to last through years of use in harsh environments resulting in durable valve bodies and inner parts.
In this way, depending on the surface finish and tolerances required, a variety of metal casting methods can be used to produce valve components.
What’s changed since the last update?
BS EN 558:2017 supersedes BS EN 558:2008+A1:2011. BS EN 558:2017 includes some technical changes with respect to BS EN 558:2008+A1:2011. These include:
- PN 500 has been deleted from the scope
- Raised face flanges has been simplified
- DN 1050 has been added to the scope
- Basic series 111 to 124 have been added
- FTF series 117 to 121, Class 250 and Class 600 have been added
- FTF series 111 and 112 have been added
