Dampfeinlass

Dampfeinlass is a German term meaning "steam inlet" or "steam admission" and is used in engineering to describe the component or port through which steam is introduced into a machine, vessel or piping system. In classical steam engines and locomotives the Dampfeinlass refers to the valve or admission passage that admits live steam into the cylinder during the power stroke. Its timing and duration (cut-off) are critical to engine efficiency and are controlled by valve gear such as Stephenson, Walschaerts or Joy systems.

Types of Dampfeinlass mechanisms include slide valves, piston valves and poppet valves; each has distinct sealing, flow and wear characteristics that influence performance and maintenance. In stationary boilers and industrial steam systems the Dampfeinlass denotes inlet connections, check valves and control valves that manage steam flow into turbines, heat exchangers and process equipment. Proper sizing, insulation and control of these inlets are important to prevent condensation, water hammer and energy losses.

Historically, advances in Dampfeinlass design contributed to improved thermal efficiency in 19th- and early 20th-century steam machinery. In modern practice the term remains in use in German-speaking technical literature for both historical engines and contemporary steam installations. Related concepts include Dampfauslass (steam exhaust), Einlassventil (inlet valve) and Dampfmaschine (steam engine). Regular inspection and maintenance are necessary to ensure safe operation and to minimize leakage and timing errors.