The valve stem is an important part for the transmission, on the next actuator or handle, the following direct drive spool to move or rotate to achieve valve switch or regulation. Stem in the valve opening and closing process is not only moving parts, mechanical parts, and the seal member.

Meanwhile, it is subject to medium impact and corrosion, but also with a filler of friction.

So the choice of the stem material, it must ensure that the required temperature has sufficient strength, good toughness, scratch resistance, corrosion resistance.

Stem is wearing parts should also note that in the selection of the mechanical properties and heat treatment processing performance.