Walking through our workshop, the first thing visitors ask is why we pour so many bodies instead of cutting them from bar stock. Investment casting starts with a wax copy of the body. The copy is dipped in ceramic slurry until a shell forms, the wax melts out, and molten stainless steel fills the cavity. What comes out is a body with the port shape already inside, so the machining step only has to finish the outside and the threads.
We run four precision casting lines here in Cangzhou. Around 500 people work at the plant, and the floor holds more than 100 CNC lathes and machining centers plus over 500 special machines. Last year the lines turned out more than one million valves, and roughly 85% of those went to Europe, the US and Japan.
For a ball valve, a cast body matters for one simple reason: wall thickness stays even. A machined block wastes material and leaves thick and thin spots that change how the pressure rating behaves. A casting carries the same section all the way around the port, which is why our bodies pass AD2000-W0 casting approval before they ever see a lathe.
Next time you compare valve prices, ask where the body came from. That answer tells you a lot about the rest of the valve.