Phep 09 Flashcards
A program designed to improve valve care and operating and maintenance procedures will promote
D) all three
The metal offering the greatest resistance to cavitation is
A)Stainless steel
Chromium and nickel are both added to steel to improve its ability to
C) resist corrosion and cavitation
Resistance to flow through a valve can be caused by
D) all three
Which of the below fittings would not be normally used with a gate valve
B) outside lever and weight
A quick opening valve should be closed slowly to
C) prevent hydraulic shock caused by water hammer
All of the below valves may be float operated
D) blowoff valves
Which of the below valves would normally be used to regulate fluid volume in a hydroelectric plant
A) needle valves
What kind of gate valve would most likely be used to reduce as much as possible the erosive action of water flowing at high velocity through high pressure gates
D) Paradox gates
All of the following gates are used for crest control except
D) paradox gates
Valves are regulated by the _____ and temperature they are designed to handle
Pressure
The highest working pressure used for valves is
Steam
Pressure drop can be defined as a _____ in energy or a_____ in pressure, in a pipeline due to the resistance in it
Loss-reduction
What kind of connections would you use on a large valve
Flanged
A ____ valve has an s shape path and is used for _____ flow
Globe-throttling
