Valvestem
Valvestem, commonly written as valve stem, is the component of a valve that transmits motion from the actuator or handle to the valve’s internal element (such as a disc, plug, or gate), thereby opening or closing the valve. The stem passes through the bonnet and is sealed with packing glands or O-rings to prevent leakage along the stem.
Stems come in rising and non-rising configurations. In rising-stem designs, the stem moves upward as the valve
Sealing and wear: the stem is a primary source of leakage when packing deteriorates; proper packing selection
Maintenance: routine inspection for bending, corrosion, and packing leakage; replace packing and, if needed, the stem,
Applications: widely used in water systems, chemical processing, oil and gas, and power plants.