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A–B–C–D–E–F–G–H–I–J–K–L–M–N–O–P–Q–R–S–T–U–V–W–X–Y Data Highway A single-cable link which provides communication between control stations which are physically separated. DC (Direct Current) Electricity which flows in one direction as produced by a battery. DCS (Distributed Control System) Central process control system distributed among two or more process control units coupled by a high speed communications network. Remote field … Read more

A–B–C–D–E–F–G–H–I–J–K–L–M–N–O–P–Q–R–S–T–U–V–W–X–Y Elastomer A natural or synthetic elastic material composed of long, chainlike molecules that are capable of recovering their original shape after being stretched to great extents. Under normal conditions the long molecules making up an elastomeric material are irregularly coiled. With the application of force, the molecules reconfigure themselves to distribute the applied stress … Read more

A–B–C–D–E–F–G–H–I–J–K–L–M–N–O–P–Q–R–S–T–U–V–W–X–Y Cage A hollow cylindrical trim element that is a guide to align the movement of a valve plug with a seat ring and also retains the seat ring in the valve body. Often the walls of the cage contain opening which determines the flow characteristics of the control valve. Capacity Rate of flow through … Read more

A–B–C–D–E–F–G–H–I–J–K–L–M–N–O–P–Q–R–S–T–U–V–W–X–Y Backseat A shoulder on the stem of a gate valve which seals against a mating surface inside the bonnet to permit replacement, under pressure of stem seals or packing. Ball The spherical closure element (obturator) of a ball valve. Ball Valve A valve which has a ball shaped component inside the body of the … Read more

A–B–C–D–E–F–G–H–I–J–K–L–M–N–O–P–Q–R–S–T–U–V–W–X–Y The Valve Automation Glossary was developed primarily to assist those having little prior knowledge of valves and to promote understanding of the special language common to the valve automation industry. The terms and their definitions given herein represent terminology relating to valves, actuators, control components and systems. This information has been conceived to provide a … Read more

A–B–C–D–E–F–G–H–I–J–K–L–M–N–O–P–Q–R–S–T–U–V–W–X–Y Abrasive Wear Chemical which speeds the vulcanization of an elastomer, so that it takes place in a shorter time or at a lower temperature. Picking up where an activator leaves off, an accelerator is often used in conjunction with a catalyst, hardener or curing agent. AC (Alternating Current) Unit of measurement Hz (cycles per … Read more