Please Define
Cavitation
When a flowing liquid goes below it's Vapor Pressure and recovers back above the Vapor Pressure.
Linear component of a globe valve
Stem/Plug
Allowable DBA per OSHA
85
plus define OSHA
Type of valve with lowest delta P when fully open
Full ported ball valve - tunnel bore
What is the sharpest of all valves
A Needle Valve
Flashing
When a flowing liquid goes below it's Vapor Pressure and stays below the Vapor Pressure on recovery.
Lives In A Box
Packing
Flow that has entrained solids
slurry
Define "PID"
Piping Instrument Diagram
A valve that cuts
A Knife Gate Valve
Vena Contracta
The flow at its highest velocity and lowest pressure.
Plug - Stem - Seat Ring =
Trim
Flow that is a combination of liquid and gas
Two Phase
3 main CV characteristics
Equal Percentage - Linear - Quick Opening
A valve that flies
A Butterfly Valve
CV Definition
The number of gallons of water per minute that flow across an orifice with a 1 pound pressure drop.
US gallons at 60 F
The Brains of the CV
Positioner
Is a liquid with high viscosity "thick or thin?"
Thick
Define Choked Flow
An increase in pressure drop no longer results in flow rate increase
A valve that rolls
A Ball Valve
CV Equation
Flow (Q) x's Square Root of S.G./Delta P
The muscle of the CV
Actuator
Define Design P&T vs Op P&T
Operating = actual P&T valve sees day to day
Design = what the valve "could" see worst case
Define Rangeability
The ratio of max controlable flow to min controlable flow
A _______ Keeper Valve
A Gate Valve