PHEP 9 Flashcards
A program designed to improve valve care and operating and maintenance procedures will promote
All three
The metal offering greatest resistance to cavitations is
Stainless steel
Chromium and nickel are both added to steel to improve its ability to
Resist acid corrosion and cavitation
Resistance to flow through a valve can be caused by
All three
which of the below fittings would not normally be used with a gate valve?
outside lever and weight
a quick opening valve should be closed slowly to
prevent hydraulic shock cause by water hammer
all of the below valves may be float operated except
blow off valve
which of the below valves would normally be used to regulate fluid volume in a hydroelectric plant?
needle valves
what type 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?
paradox
all of the below valves are normally used for crest control except
Paradox
valves are rated by the ___ and temperature they are designed to handle
pressure
the highest working pressure rating used for valves is
steam
pressure drop can be defined as a ___ in energy of a ____ in pressure, in a pipeline due to the resistance in H
loss, reduction
what type of connections would you use on a large valve
flanged
a ___ valve has a S shaped path and is used for ___ flow
globe, throttling
