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A physical object intended to prevent something to pass.
An attenuator is a telecommunication device that reduces the amplitude of a signal without appreciably distorting its waveform. Attenuators are usually passive devices. The degree of attenuation may be fixed, continuously adjustable, or incrementally adjustable.
A self-controlled device for making, carrying, and automatically interrupting and reclosing an alternating-current circuit.
An automatic tracking system used on ships and by vessel traffic services (VTS) for identifying and locating vessels.
A physical object that is automatic and designed to initiate the operation of circuit-breakers and/or disconnectors in a substation according to a specific programme.
A dynamic compressor in which the gas is accelerated by the action of a bladed rotor and where the main flow is along the rotation axis of the rotor.
A detecting element that is intended to detect axial displacement.
A transmitter measuring an axial displacement and generating a standardized output signal representing the axial measured displacement.
Is a gas flow damper intended to adjust an air flow rate through a duct.
A ball valve that is equipped with an actuator that manipulates a stream of fluid in the response to a signal from an external sensing element and with input of energy from an external source.
A rotary valve that has a ball closure member.
A railing or wall to provide a protective edge to prevent people from falling over the edge of stairs, a roof or mezzanine work area.
A large flat-bottomed boat that is built for carrying goods and people on rivers and canals or in harbours, with or without sails, towed by a tug or horse. Also a similar boat with its own engine.
A container intended to store liquid or solid material partly or totally below grade and that is typically open.
A container that has a characteristic shape and that is made of material with an open structure.
A direct current power supply unit intended to supply stabilised DC electric power according to specified levels and tolerances.
A direct current power supply unit for charging batteries.
A compartment or area within a building with a specified function.
A support that is a large and straight piece of normally timber or iron forming one of the main structural member of a building or supporting structure.
An equipment item that can be clamped to a beam to provide an attachment.
A pump jack that converts rotary motion to vertical reciprocating motion.
A physical object intended to support and locate a moving or static element and capable of reducing friction and transfer forces in a connection.
A physical object that is a hollow body with a flared mouth made of cast metal. Formed to emit a clear musical sound by the sonorous vibration of its entire circumference when struck by a clapper, hammer or other appliance.
A conveyor that consists of a suitably tensioned endless belt made from hard wearing materials and arranged to run over rollers.
A two or three wheeled vehicle designed to be propelled solely by human power, or a two or three wheeled vehicle that is a power assisted pedal cycle.