What is the difference of GG25 and GGG-40 in butterfly valves?

Answer 1

GG25 and GGG-40 refer to different grades of cast iron used in the construction of butterfly valves. GG25 is a grey cast iron with a minimum tensile strength of 250 MPa, while GGG-40 is a ductile iron with a minimum tensile strength of 400 MPa, offering higher strength and impact resistance. The choice between them affects the valve's performance, durability, and suitability for specific applications, particularly in terms of pressure and temperature ratings. Generally, GGG-40 is preferred for more demanding environments due to its enhanced mechanical properties.