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2. List of valves - Wikipedia

   en.wikipedia.org/wiki/List_of_valves

   Rotary valves and piston valves: parts of brass instruments used to change their pitch; Rotolock valve; Rupture disc: a one-time-use replaceable valve for rapid pressure relief, used to protect piping systems from excessive pressure or vacuum; more reliable than a safety valve; Saddle valve: where allowed, is used to tap a pipe for a low-flow need

3. Verification and validation - Wikipedia

   en.wikipedia.org/wiki/Verification_and_validation

   Verification is intended to check that a product, service, or system meets a set of design specifications. [6] [7] In the development phase, verification procedures involve performing special tests to model or simulate a portion, or the entirety, of a product, service, or system, then performing a review or analysis of the modeling results.

4. Variable-frequency drive - Wikipedia

   en.wikipedia.org/wiki/Variable-frequency_drive

   Small variable-frequency drive Chassis of above VFD (cover removed). A variable-frequency drive (VFD, or adjustable-frequency drive, adjustable-speed drive, variable-speed drive, AC drive, micro drive, inverter drive, variable voltage variable frequency drive, or drive) is a type of AC motor drive (system incorporating a motor) that controls speed and torque by varying the frequency of the ...

5. Ground loop (electricity) - Wikipedia

   en.wikipedia.org/wiki/Ground_loop_(electricity)

   Ground loop current caused by leakage currents in the building's ground wire system from an appliance A Another less common source of ground loop currents, particularly in high-power equipment, is current leaking from the hot side of the power line into the ground system.

6. Kerosene - Wikipedia

   en.wikipedia.org/wiki/Kerosene

   Today, kerosene is mainly used in fuel for jet engines in several grades. One highly refined form of the fuel is known as RP-1 , and is often burned with liquid oxygen as rocket fuel . These fuel grade kerosenes meet specifications for smoke points and freeze points .

7. Virginia v. West Virginia - Wikipedia

   en.wikipedia.org/wiki/Virginia_v._West_Virginia

   Virginia v. West Virginia, 78 U.S. (11 Wall.) 39 (1871), is a 6–3 ruling by the Supreme Court of the United States that held that if a governor has discretion in the conduct of the election, the legislature is bound by his action and cannot undo the results based on fraud.