5-Axis CNC Machined Brass Valve Cores and Spools

The round body is turned first, with sealing lands, grooves and threads cut while the part is still in the lathe. It then moves to a 5-axis machine where cross ports, metering slots and angled passages are milled relative to the turned datum. For simpler parts, a turn-mill lathe with Y-axis finishes everything in one cycle. Burrs at port edges are removed carefully because they affect flow and seal life.

Brass C36000 and H59 are the usual grades: they machine extremely well and resist water and gas corrosion. Where lead content is restricted, such as drinking-water parts, lead-free or low-lead brass grades can be used at a higher machining cost. Spools can be nickel or chrome plated for wear resistance and appearance; sealing surfaces are often left bare and fine-turned for smoothness.

Sealing diameters are checked with micrometers and air gauges, port positions on CMM, and surface roughness on sealing lands. Parts are 100% inspected on critical dimensions, washed and packed to avoid damage to sealing edges. Typical uses include ball valve stems, cartridge spools, gas valve cores, faucet diverters and pneumatic directional-valve spools.