| CAST
IRON |
ASTM
A-126 Class B |
| A general
purpose material suitable for water, air, petroleum products,
most solvents, dry powders, and a wide variety of chemicals
when used in the unlined state. Can be lined with a wide variety
of rubbers and plastics to handle almost any process media.
(low cost) |
|
| DUCTILE
IRON |
ASTM
A-536-GR 65-45-12 |
| A general
purpose material with usage similar to cast iron. Ductile
iron however is much stronger and more capable where there
may be high pipeline stresses, danger from impact, or concern
from leakage upon line or valve fracture. Normally ductile
iron can be used as a direct replacment for steel valves.
Can be lined with a wide variety of rubbers and/or plastics
to handle almost any process media. (medium cost) |
|
| CAST
STEEL |
ASTM
A-126, GR WCB |
| Another
general purpose material somewhat less resistant to corrosion
than cast iron especially where water is the media. Steel
is much stronger and like ductile iron much more capable where
there may be high pipeline stresses, danger from impact or
concern from leakage upon line or valve fracture. Steel valves
are expensive and normally only used where specified by the
end user.Can be lined with a wide variety of rubbers and/or
plastics to handle almost any process media. |
|
| 316
STAINLESS STEEL |
ASTM
A-351 GR CF8M |
| An alloy
of iron, carbon, nickel and chromium. Suitable for most foods,
beverages, pharmaceuticals, solvents, sea water, oils, and
some acids and alkalies. |
|
| ALLOY
20 ST. ST. |
ASTM
A-351 GRADE CN-7M |
| Has
higher amounts of nickel and chromium than 300 series stainless
steels. It is more resistant to sulfuric acid and is used
widely in chemical processing and water treatment. |
|
|
