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WorksheetsValve Repair
Total questions: 20
Worksheet time: 10mins
Portions of the valve stem on an OS+Y gate valve are smooth because ______.
it looks workmanlike
it makes the stem glossier
it makes the valve work faster
it provides a smooth sealing surface
The component that physically stops the flow of water when the valve is closed is the ______.
gland follower
gate
gland bolt
stuffing box
Tightening the gland follower bolts _______.
compresses the packing
expands the packing
does nothing to the packing
compresses the valve handwheel
The tool most commonly used to remove the old valve packing is _______.
a spud wrench
a post indicator wrench
a packing extractor
a valve packer
Valve packing ________.
is available in one size and type only
size and type varies by valve
is always made of Teflon
is always precut
The ends of the valve packing rings ______.
should be carefully aligned together
should be frayed
should be staggered 90 degrees
should overlap by 20 percent
After installing the new packing and reinstalling the gland follower, the gland bolts should be tightened _______.
to 50 ft./lbs.
to 75 ft./lbs.
to 100 ft./lbs.
until the valve stops leaking
You can access the valve stem and valve gate for removal, repairs or replacement by ______.
removing the gland follower
unbolting the valve from its flanges
removing the handwheel and bonnet
taking off just the handwheel
The stuffing box of a valve is ______.
where the valve packing is placed
where the flange bolts are found
where the bonnet bolts are accessed
where the handwheel is found
The handwheel opens and closes the valve _______.
by compressing the valve flanges
by moving the valve stem connected to the gate
by tightening and loosening the gland follower bolts
by rotating the valve packing within the packing box
A small leak around the valve packing and stem can sometimes be repaired without repacking the valve by ______.
loosening the valve gland bolts
tightening the valve gland bolts
tightening the valve flange bolts
using a harsh cleaning chemical on the valve
An open _____ non-rising stem gate valve is indicated by a red nut.
left
slow
right
fast
It takes approximately ____ turns to open/close a 6” gate valve.
21
12
30
28
A maximum of _____ revolutions of the handwheel of and OS&Y valve are required before a signal is sent to the alarm panel.
2
3
4
5
The ______ is the part of the valve that houses the gate when the valve is open.
Gate
Bonnet
Body
Yoke
The ______ is the bottom half of the valve casting.
Gate
Bonnet
Body
Yoke
Be sure to stagger cut ends of packing _____ degrees apart.
45
90
180
360
A(n) _______ is required any time you operate a system control valve.
Impairment Plan
Impact Assessment
Valve status test
Fire Watch
PIV operators connect to ______ valves.
Butterfly
Outside Stem and Yoke
Globe
Non-Rising Stem
NFPA 25, 2023 15.5.1 states that all preplanned impairments shall be authorized by the ______.
AHJ
Insurance company
Sprinkler Contractor
Impairment Coordinator
