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An adjustable ring in a safety valve, used to control the amount of blowback.



Related Terms

BOILER SAFETY CONTROL

Automatic controls and interlocks (including relays, switches, and other auxiliary equipment used in conjunction to form a safety control system) which are intended to prevent unsafe operation of the controlled equipment.

BOILER SAFETY SHUT DOWN

The action of shutting off all fuel and ignition energy to the burner by means of safety control or controls such that restart cannot be accomplished without operator action.

INTERNATIONAL MARITIME ORGANIZATION

A Specialized Agency of the United Nations responsible for maritime safety and efficiency of navigation. The IMO provides for cooperation among governments in the field of governmental regulations and practices relating to technical matters of all kinds affecting shipping engaged in international trade: to encourage the general adoption of the highest practicable standards in matters concerning maritime safety, efficiency of navigation, and the prevention and control of marine pollution from ships, and to deal with legal matters related to the purposes set out in Article 1 of the Convention.

BOILER PRIMARY SAFETY CONTROL

A control responsive directly to flame properties, sensing the presence of flame and, in the event of ignition failure or unintentional flame extinguishments, causing safety shutdown.

TIME DELAY

A deliberate delay of a predetermined time in the action of a safety device or control.

BOILER OPERATING CONTROL

A control, other than s safety control or interlock, to start or regulate input according to demand and to stop or regulate input on satisfaction of demand. Operating controls may also actuate auxiliary equipment.

HYSTERESIS CLUTCH

A clutch in which torque is produced by attraction between induced poles in a magnetized iron ring and the control field.

INTERLOCK

A device to prove the physical state of a required condition and to furnish that proof to the primary safety control circuit.

INTELLIGENT TRANSPORTATION SYSTEMS

The application of advanced technologies to surface transportation problems, including traffic and transportation management, travel demand management, advanced public transportation management, electronic payment, commercial vehicle operations, emergency services management, and advanced vehicle control and safety systems. Previously known as intelligent vehicle highway systems.

LIMIT CONTROL

An automatic safety control responsive to changes in liquid level, pressure, or temperature; normally set beyond the operating range for limiting the operation of controlled equipment.

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