ventilstammen

Ventilstammen, or valve stems, are slender rods that transmit motion to a valve element and form a key component in both internal combustion engine valves and many industrial valve assemblies. In engines, the ventilstammen connects the valve head to the camshaft follower or rocker arm and passes through the valve guide. The stem moves up and down to open and close the valve, while a valve spring returns it to the closed position. In industrial valves, the stem connects a handwheel, electric actuator, or pneumatic actuator to the plug, ball, or gate, and is sealed with packing to prevent leakage along the bonnet.

The stem is typically made from high-strength steel alloys, stainless steel, or other alloys suitable for high temperature and corrosive environments. It is machined to tight tolerances and may be hollow or solid depending on the design. The stem passes through a valve guide or packing gland, which reduces lateral movement and helps maintain a seal.

Wear or bending of the ventilstammen can lead to poor valve seating, reduced compression in engines, or slower, less precise operation in industrial valves. Routine inspection for straightness, wear, and sealing integrity is common maintenance practice. When worn, the stem or guide may be replaced, or the valve may be ground or replaced as a unit.

This overview provides a general sense of ventilstammen; specific designs vary by engine or valve type and manufacturer specifications should be consulted for detailed information.