Valves Flashcards
The moving part of a valve that directly affects the flow through the valve is known as the _________.
Disc
The nonmoving part of the valve on which the disc rests to form a seal and close off the valve is known as the ______.
Seat
Most types of valves work best if they are installed with the stem in a(n) _______ position.
Upright
When working on a valve, always put the _________ in the vise.
Bonnet
When making up screwed valve connections, how many threads should be showing outside the valve?
3
The valve stem provides a link between the handwheel and the ________.
Gate
The type of stem that does not come in contact with the fluid in the system is the ________ stem.
OS & Y
The type of O-ring that needs additional mechanical loading when used in dynamic seals is the _________ O-ring.
Tephlon
Packing prevents fluid from leaking up around the valve _________.
Stem
The packing material fills the space between the valve stem and the bonnet, which is known as the _________.
Stuffing box
When removing a threaded valve to replace it or repair it, the pipe should be cut _________.
Downstream of the valve
The first step for removing a flanged valve is to ________.
Isolate the valve
When removing or installing threaded valves, put the pipe wrench on the ________.
Body of the valve
Unless otherwise instructed in the specifications, globe valves should be installed with the _________.
Pressure below the disc
Nonrising stem valves are used in installations where _______.
Space is limited
