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EN 1171 Industrial valves - Cast iron gate valves - Coggle Diagram
EN 1171
Industrial valves - Cast iron gate valves
Body ends
Flanged
For isomorphic valves, the flange facing and mating dimensions are PN 10
Spigot ends
Must be compatible with adjacent piping (indicate outer diameter)
Socket ends
Must be compatible with adjacent piping
Material
For both body and bonnet
Table 1
Grey C.I
Malleable C.I
Spheroidal graphite C.I
Pressure designation
Clause 1
Isobaric
PN 6, 10, 16, 25
Isomorphic
Maximum allowable pressure 10 bar to 1 bar
Table 2. Rarely used.
Face to face and End to end dimensions
Flanged
Basic series: Table 3
Socket/Spigot
Given in manufacturer's documentation
Seat bore
Reduced bore
flow section ≥ 36% of the section corresponding to the nominal inside diameter of the body end port and which does not correspond to the full bore valve
Full bore
flow section ≥ 80% of the section corresponding to nominal inside diameter of the body end port (EN 736-3, 3.3.3). Full bore valves are often mistaken for clearway valves where the flow section is 100% of the inside diameter.
Seating surfaces
Metallic
body and/or obturator seat
body and/or obturator seat ring
body and/or obturator hard facing
Soft seat
body or obturator (aka as resilient seated)
Strength torque category
Table 6 (depends on operating device)