German Schematic and Machinery Terms: A Working Glossary

Technical guide · Schematic Translator · September 2026

German-built machinery comes with excellent documentation, and much of it stays in German long after the machine reaches an English-speaking floor. The good news for a technician: the symbols on a German hydraulic or electrical schematic follow ISO standards and read exactly like their English-language equivalents. What you need is the vocabulary printed around them: component names, pressures, ports, and the maintenance instructions that tell you what to actually do.

This glossary collects the German terms technicians meet most often on schematics, nameplates, and maintenance pages, with plain English equivalents. Umlauts matter: Rückschlagventil and Druckminderer will not look up correctly without them.

New to the symbols themselves? How to Read a Hydraulic Schematic walks through the ISO 1219 symbols, port labels, and a step-by-step method for tracing any circuit.

Components: valves

German	English	Notes
das Ventil	valve	the general word
Druckbegrenzungsventil	pressure relief valve	literally "pressure limiting valve"; limits maximum system pressure
Druckminderer / Druckminderventil	pressure reducing valve	limits pressure downstream
Rückschlagventil	check valve	one-direction flow
Absperrventil / Absperrorgan	shut-off valve / isolating element	isolation, not control
Wegeventil	directional control valve	often seen with a count, e.g. 4/3-Wegeventil
Stetigventil / Regelventil	proportional / control valve	continuously variable
Drossel(-rückschlagventil)	throttle (check) valve	flow control, often with a built-in check for free return

Components: pumps, cylinders, and accessories

German	English	Notes
die Pumpe	pump
der Motor	motor	electric or hydraulic
der Zylinder	cylinder	hydraulic or pneumatic actuator
der Kolben / die Kolbenstange	piston / piston rod
der Behälter / der Tank	reservoir / tank
der Speicher (Druckspeicher)	accumulator (pressure accumulator)
der Filter / die Filtereinheit	filter / filter unit
der Ölkühler / Kühler	oil cooler / cooler	heat exchanger
der Anschluss / die Anschlüsse	port / ports, connections

Pressures, flow, and readings

German	English
der Druck	pressure
Betriebsdruck	operating pressure
Maximaldruck / Höchstdruck	maximum pressure
Prüfdruck	test pressure
der Vordruck / Gegendruck	inlet pressure / back pressure
die Fördermenge / Förderstrom	flow rate / delivery flow
die Drehzahl	rotational speed (rpm)
das Drehmoment	torque
die Kraft / der Hub	force / stroke
die Leckölleitung / Lecköl	leakage oil line / leakage oil
die Temperatur / die Erwärmung	temperature / heating (temperature rise)

Port labels on German directional valves

German drawings use the same international port letters as ISO drawings, so the letters transfer directly. What differs is that German documents also spell them out: P (Pressure / Druck), T (Tank / Behälter), A and B (working ports / Arbeitsanschlüsse), X, Y, Z (pilot ports / Steueranschlüsse), and L (leakage or drain / Leckölanschluss).

Lines and connections

German	English
die Leitung	line, pipe, hose (electrical: wire)
Druckleitung	pressure line
Rücklaufleitung / Rückleitung	return line
Saugleitung	suction line
Steuerleitung	pilot / control line
die Verschraubung / der Gewindeanschluss	fitting / threaded connection

Maintenance and documentation words

German	English
die Wartung / die Instandhaltung	maintenance / upkeep
die Instandsetzung	repair
der Ölwechsel	oil change
der Filterwechsel	filter change
der Schmierplan	lubrication schedule
die Betriebsanleitung	operating manual / instructions
der Schaltplan	circuit / schematic diagram
die Störung / die Störungssuche	fault, malfunction / troubleshooting
die Sicherheitshinweise	safety instructions
die Einstellung / einstellen	setting / to set, adjust
die Prüfung / prüfen	inspection, test / to check
ersichtlich / entnehmen	visible, evident / to take from (a source)

Two sentence patterns cover a surprising amount of German maintenance text: "alle X Betriebsstunden" (every X operating hours) and "siehe Betriebsanleitung" (see the operating manual).

Field habit: when a German drawing mixes words you know with words you do not, translate the whole block, not the unknown word alone. Compound nouns like Druckbegrenzungsventil decode reliably once you know the pieces (Druck = pressure, Begrenzung = limiting, Ventil = valve), but setpoints and interlock notes only make sense as complete sentences.

Standards behind German drawings

German hydraulic schematics are drawn to DIN ISO 1219, the German adoption of the ISO 1219 fluid power standard; older drawings may use DIN 24300 symbols that ISO 1219 largely absorbed. Electrical schematics follow DIN EN 61082 drafting rules, with component reference letters serving the same role that tag numbers serve on a P&ID. The symbols read like any ISO drawing; it is the surrounding text that needs translating.

Translating the drawing itself

You can hold this glossary next to a drawing and work out most component names. But set pressures, alarm notes, and step-by-step procedures deserve better than word-by-word decoding. Schematic Translator photographs a German schematic and overlays verified English on every text block, keeping every number and symbol exactly as printed, so nothing critical gets guessed.

Have a German schematic on your bench? Photograph it and get verified English overlaid on the original drawing. Every pressure, part number, and symbol stays exactly as the manufacturer printed it.

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