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    Valves Guide  Glossary of Valve Terms  ACCUMULATOR  A vessel in which a gas is trapped and compressed by the liquid in a hydraulic system, thus storing energy to supply liquid under pressure to the system when needed.  ACME THREAD  A flat topped screw thread for power transmission. This thread has a 29° included angle between adjacent thread faces compared with the 60° angle of the U.S. standard "V" thread.  ACTUATOR  Device used to operate a valve using electric, pneumatic or hydraulic means. Often used for remote control or sequencing of valve operations.  ADAPTER SPOOL  An extension which is added to a short face-to-face valve, to conform to standard API 6D face-to-face dimensions.  AGA - AMERICAN GAS ASSOCIATION  A society comprising gas companies set up to achieve common goals.  AISI - AMERICAN IRON AND STEEL INSTITUTE  An association of steel makers which sets standards for th...

Computer  Technology  All About a Computer A  mouse is  a device that controls the movement of the cursor or pointer on a display screen. A mouse is a small object you can roll along a hard, flat surface. Douglas Engelbart in 1868 became the father of the modern mouse. He developed a gadget made with a wooden base usingtwo wheels to roll back and forth. It was the first mouse that could fit into a user's hand. A keyboard is the set of typewriter-like keys used to enter data into a computer.Keyboards are similar to typewriter keyboards but contain additional keys.A computer is a programmable machine. Computers respond to a specific set of instructions in a well-defined manner and execute prerecorded instructions. A typical digital computer consists of: 1. A central processor unit (CPU) 2. A memory 3. Input/output (1/0) ports A bit (short for binary digit) is the smallest unit of data in a computer. A bit has a single binaryvalue, either 0 or 1....