Spanish Schematic and Machinery Terms: A Working Glossary

Technical guide · Schematic Translator · September 2026

Machinery built in Spain, and machines documented for Spanish-speaking crews across Latin America, often carries schematics, nameplates, and maintenance pages that stay in Spanish for the machine's whole life. The good news for a technician: the symbols on a Spanish hydraulic schematic follow ISO 1219 and read exactly like their English-language equivalents. What you need is the vocabulary printed around them.

This glossary collects the Spanish terms technicians meet most often on schematics, nameplates, and maintenance pages, with plain English equivalents. Accents matter for lookup: válvula and presión 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

Spanish	English	Notes
la válvula	valve	the general word
válvula limitadora de presión / válvula de seguridad	pressure relief valve / safety valve	limits maximum system pressure
válvula reductora de presión	pressure reducing valve	limits pressure downstream
válvula de retención (antirretorno)	check valve	one-direction flow
válvula de corte / de aislamiento	shut-off valve	isolation, not control
válvula distribuidora	directional control valve	often seen with a count, e.g. distribuidor 4/3
válvula proporcional	proportional valve	continuously variable
válvula de estrangulación	throttle valve	flow control; with a built-in check for free return: con antirretorno

Components: pumps, cylinders, and accessories

Spanish	English	Notes
la bomba	pump
el motor	motor	electric or hydraulic
el cilindro (hidráulico)	cylinder	hydraulic or pneumatic actuator
el pistón / el vástago	piston / rod
el depósito / el tanque	reservoir / tank
el acumulador	accumulator
el filtro	filter
el enfriador de aceite	oil cooler	heat exchanger
la toma / el orificio	port

Pressures, flow, and readings

Spanish	English
la presión	pressure
presión de trabajo / de servicio	operating pressure
presión máxima	maximum pressure
presión de prueba	test pressure
presión de entrada / contrapresión	inlet pressure / back pressure
el caudal	flow rate
el (régimen de) giro	rotational speed (rpm)
el par (motor)	torque
la fuerza / la carrera	force / stroke
la fuga / el aceite de fuga	leakage / case oil (case drain)
la temperatura / el calentamiento	temperature / heating (temperature rise)

Port labels on Spanish directional valves

Spanish hydraulic drawings use the same international port letters as ISO drawings: P (presión), T (tanque, tank return), A and B (tomas de trabajo, the working ports), X, Y, Z (pilotaje, pilot ports), and L (retorno de fugas or drenaje, the case drain). The letters transfer directly; the words beside them are what need translating.

Lines and connections

Spanish	English
la tubería / la manguera	pipe / hose
línea de presión	pressure line
línea de retorno	return line
línea de aspiración	suction line
línea piloto / de mando	pilot / control line
el racor / la unión	fitting / connection

Maintenance and documentation words

Spanish	English
el mantenimiento	maintenance
la reparación	repair
el cambio de aceite	oil change
el cambio de filtro	filter change
el plan de engrase	lubrication schedule
el manual de instrucciones	operating manual
el esquema (hidráulico)	schematic (hydraulic diagram)
el fallo / la avería	fault, malfunction
la localización de averías	troubleshooting
instrucciones de seguridad	safety instructions
el ajuste / ajustar	setting / to set, adjust
la comprobación / comprobar	inspection, check / to check
en marcha / parado	running / stopped

Two sentence patterns cover a surprising amount of Spanish maintenance text: "cada X horas de servicio" (every X operating hours) and "consulte el manual de instrucciones" (consult the operating manual).

Field habit: Spanish technical names are descriptive rather than compounded, so a term like válvula limitadora de presión decodes word by word (valve, limiting, of pressure). But setpoints and interlock notes only make sense as complete sentences, so translate whole blocks, not single words.

Standards behind Spanish drawings

Spanish hydraulic schematics are drawn to UNE-EN-ISO 1219, the Spanish adoption of the ISO 1219 fluid power standard, so the symbols read like any ISO drawing. Process and instrumentation documents in Spanish industry often keep ISA-5.1-style tag letters while the surrounding words stay Spanish. The symbols are universal; it is the text around them 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 Spanish schematic and overlays verified English on every text block, keeping every number and symbol exactly as printed, so nothing critical gets guessed.

Have a Spanish 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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