PART 2 Flashcards
A phrase describing the sealing ability of a valve.
bubble-tight shutoff
A short face-to-face valve that has a movable vane in the center of the flow stream, which rotates 90° as the butterfly valve opens and closes.
butterfly valve
A system of pipes and valves permitting the diversion of flow or pressure around a line valve.
bypass
The number of gallons of water per minute that will flow through a valve with a pressure drop of 1 psi.
capacity factor (of a valve), Cv, Kv
The rapid formation and collapse of vapor pockets in a flowing liquid in localized regions of very low pressure.
cavitation
A mechanical impact test conducted on a precisely machined coupon of the steel to be tested.
charpy test
A one-directional valve that is opened by the fluid flow in one direction and closes automatically when the flow stops or reverses direction.
check valve
The metering and pressure-reducing station where gas is transferred from a high-pressure cross-country transmission line to a low-pressure distribution piping system, usually within a city.
city gate
A U-shaped connector used to loosely join parts by means of a bolt or pin passing through the ends of the connector.
clevis
The process of converting coal to a form of synthetic natural gas.
coal gasification
A valve that controls a process variable, such as pressure, flow or temperature, by modulating its opening in response to a signal from a controller.
control valve
A device that measures a controlled variable, compares it with a predetermined setting and signals an actuator to readjust the opening of a valve in order to re-establish the original control setting
controller
A power-piston valve operator that converts hydraulic or pneumatic pressure into linear motion of a valve stem (piston rod).
cylinder operator
Extending a blowdown valve (BDV) on large gate valves requires a tube that is located inside of the valve.
dip tube
A valve arrangement that ensures no flow in a line, although the valve may leak.
double block-and-bleed
