Valve Maintenance
Because of there importance, valves must be _______ correctly and _________ regularly.
Installed Maintained
These are the three general valve-stem types.
What are rising stem, non-rising stem, and outside screw-and-yoke (OS&Y)?
This material stops fluid from leaking around the valve stem
What is packing
This valve-stem position should be avoided because the bonnet can trap sediment and water.
What is pointing the stem downward?
On this type of valve, both the handwheel and stem rise when the valve opens.
What is a rising stem valve
Packing may be square, wedge, or this shape.
This valve component group includes the stem, disc, seat ring, disc holder or guide, wedge, and bushings.
Valve Trim
This stem type is suitable for corrosive fluids because the stem does not contact the fluid in the line.
What is an OS&Y stem?
This component presses packing against the stem inside the stuffing box.
What is the gland?
Threaded joints commonly connect pipe to smaller valves up to approximately this size.
What is 2 inches?
With an approximate service range of −300°F to 500°F, this O-ring material has excellent chemical and temperature resistance.
What is Teflon®?
The particles in this packing help carry away heat
What is graphite?
Unless job specifications require otherwise, this type of valve should be installed with pressure below the disc.
What is a globe valve?
This space between the valve stem and bonnet is filled with packing to prevent leakage along the stem.
What is the stuffing box?
This packing is often used on pumps, mixers, and agitators.
What is Teflon® filament packing?