valve
Unless otherwise instructed in the specifications, globe valves should be installed with the _____.
WHAT IS
pressure below the disc
Packing prevents fluid from leaking up around the valve _____.
WHAT IS
stem
Packing shapes include square, wedge, and _____.
WHAT IS
ring
What part of the valve contains the disc, seat, and valve ports.
WHAT IS
the valve body
the internal opening for flow through a valve is _____?
what is
Port
The non-moving part of the valve on which the disc rests to form a seal and close off the valve isknown as the _____.
WHAT IS
seat
The ability of an O-ring to return to its original shape and size when released from pressure is referredto as a _____.
WHAT IS
low compression set
The type of stem that does NOT come in contact with the fluid in the system is the _____.
WHAT IS
OS&Y stem
what part of the valve that contains the trim and is located above the body.
WHAT IS
the bonnet
___ pressure, is when the flow is pushing the closure element out of the rest.
what is
reverse pressure
The moving part of a valve that directly affects the flow through the valve is known as the _____.
WHAT IS
disc
The valve stem provides a link between the handwheel and the _____.
WHAT IS
gate
What is the first step in replacing a valve stem O-ring?
WHAT IS
Removing the jam nut from the valve stem
____ pressure, is when the flow is pushing the sealing element of the valve into the seat and improving closure?
What is
direct pressure
the nonmoving part of the valve on which the disc rests to form a seal and close off the valve.
what is seat
MOST types of valves work BEST if they are installed with the stem in which of the followingpositions?
WHAT IS
Upright
If a valve is leaking through the stem and tightening the valve does NOT stop it, what is the next step?
WHAT IS
Check the packing
Non-rising stem valves are used in installations where _____.
WHAT IS
space is limited
what is the moving part of the valve that directly affects the flow through the through the valve.
WHAT IS
disc
the part of the valve that connects the disc to the valve operator, and can have linear, rotary, or helical movement.
what is stem
When making up screwed valve connections, how many threads should be showing outside the valve?
WHAT IS
Three
The packing material fills the space between the valve stem and the bonnet, which is known as the_____.
WHAT IS
stuffing box
What type of bonnet has a male threaded piece that screws inside the body of the valve?
WHAT IS
Threaded
What is the material between the valve stem and bonnet that provides a leakproof seal and prevents material from leaking up around the valve stem.
What is
Packing
the internal parts of a valve that receive the most wear and can be replaced. this includes the disc, seat ring, disc holder or guide, wedge and bushings?
what is trim