seals test teacher questions Flashcards
Compression packing in a pump. Stuffing box is an example of.?
positive external seal
non positive seal
positive internal seal
static seal
static seal
automatic packing are special profiled rings with interference fir on the shaft , it seals in what direction?
seals in only one direction
O-rings can be used as what type of seals?
made from synthetic rubber can be used as a dynamic or static seal
Dynamic seals may be positive or?
non postive
Compression packing in a pump. Stuffing box is an example of.
A- positive external seal
b-postive interal seal
c-non positive seal
d-static seal
non positive
Seals between moving and stationary surface frequently helped by system. Pressures are called ?
dynamic seal
Seals between two surfaces which have no relative motion are called
static seal
This type of packing is called unbalanced, and it seals only one diameter
cup packing
O-ring used in conjunction with anti-extrusion rings or back up washers can withstand pressures up to
3000 psi
How much larger than the O-ring is the groove in which it sits
150%
Standard O-rings are related to____ psi?
1500 psi
What percent of O-ring diameter should diametral squeeze, be held
10%
This type of parking is used in sets of three or more rings, depending on working pressure
v packing (chevron packing)
This type of packing must be used with shaped male and female, adaptor rings
v packing
This type of packing normally does not steal until the heel diameter has been expanded
cup packing
This type of packing uses an adjustable gland follower, as well as spring force to adjust the compressive force on the packing
v ring packing
Seals use for Pistons win. Rapid travel, and frequent cycling are needed or called.
piston rings
This type of cell is a low pressure seal used, mainly with rotating shafts
lip seal
The pressure on the lip seals will be at a maximum pressure of
min 2psi
max 10 psi
When replacing gasket material between machine parts, it is important that the material be
original thickness
This component distributes sealing liquid under pressure to the packing and prevents air filtration into the pump casing
lantern ring
When packing seals on both the ID and OD, it is referred to as
balanced seal
When installing lips sealed the position of the lip is very important in which direction should the lip be facing in a contaminated environment?
facing the environment
This seal is an extremely efficient axle seal, being more effective than any other, dynamic seal, preventing leakage
mechanical seal
