The 24th China International Petroleum and Petrochemical Technology and Equipment Exhibition

Valves are control components in fluid transportation systems, with functions such as shutting off, regulating, diverting flow, preventing backflow, stabilizing pressure, branching, or relieving overflow. In general, most valves close clockwise and open counterclockwise, or you could say left to open, right to close. Let’s first go over some basic valve operation knowledge: since most people are right-handed, it’s easier to turn clockwise than counterclockwise with the right hand. So, from both energy-saving and safety perspectives, opening counterclockwise and closing clockwise is relatively more reasonable.

The flow rate and velocity of a valve mainly depend on the valve diameter, are also related to the resistance of the valve’s structure to the medium, and are intrinsically related to factors such as valve pressure, temperature, and medium concentration.What exactly is the relationship between the two?

What exactly are “steel” and “iron,” what are their properties, and what is the relationship between them? Where do the terms 304, 304L, 316, and 316L come from, and what are the differences between them? Steel: A material with iron as its main element, generally containing less than 2% carbon, and also containing other elements. —GB/T 13304-91 “Classification of Steel” Iron: A metallic element, atomic number 26. Iron materials have strong ferromagnetism and good plasticity and thermal conductivity. Stainless Steel: A type of steel resistant to weak corrosive media such as air, steam, and water, or possessing rust-resistant properties. Commonly used grades are 304, 304L, 316, and 316L, which are the 300 series of austenitic stainless steels.