Quiz

Question 1

The difference between the actuating pressure setpoint and the pressure at which the safety valves resets is called

Answer 1

Blowdown

Question 2

True or False. Flow to lift check valves must always enter below the seat

Answer 2

True

Question 3

_____ posses many advantages over gate ,globe, plug, and ball valves, especially for large applications. Savings in weight, space and cost are the most obvious advantages. The maintenance costs are usually low because there are a minimal number of moving parts and there are no pockets to trap fluids.

Answer 3

Butterfly Valves

Question 4

True or False. The lug wafer design, is held in place betweem two pipe flanges by bolts that join the two flanges and pass through holes in the valve’s outer casing

Answer 4

True

Question 5

The principal parts of the reducing valve are the ____ ; an upward-s earing valve that has a piston on top of its valve stem, an upward-seating auxiliary ( or controlling ) valve, a controlling diaphragm, and an adjusting spring and screw

Answer 5

Main valve

Question 6

___ are best suited for high pressure and other severe services.

Answer 6

Y-body globe valves

Question 7

True or False. The gland of the plug valve is equivalent to the bonnet of a gate or globe valve.

Answer 7

True

Question 8

___ Is a linear motion valve used to stop, start and regulate fluid flow.

Answer 8

Globe Valve

Question 9

When compared to a gate valve generally yields much ___ seat leakage.

Answer 9

Less

Question 10

Globe valves can be arranged so that the disk closes against or in the same direction of fluid flow. When the disk closes ___ the direction of flow, the kinetic energy of the fluid impedes closing but aids opening of the valve.

Answer 10

Against

Question 11

When the disk closes in the ___ direction of flow, the kinetic energy of the fluid aids closing but impedes opening. The characteristic is preferable to other designs when quick-acting stop valves are necessary.

Answer 11

Same

Question 12

True or False . Glove valves also have drawbacks. The most evident shortcoming of the simple glove is the high head loss from two or more right angle turns of flowing fluid.

Answer 12

True

Question 13

Drawbacks of ___ valves are large openings necessary for disk assembly, heavier weight than other valves of the same flow rating, and the cantilivered mounting of the disk to the stem.

Answer 13

Globe

Question 14

Is a one-piece disk with a cut around the perimeter to improve the ability to match error or change in the angle between the seats.

Answer 14

The flexible wedge gate valve

Question 15

Are of the ball and socket design. These are self-adjusting and self-aligning to both seating surfaces.

Answer 15

Split wedges gate valves

Question 16

True or False. Valve bonnets, although a necessity for most valves, increase valve size, represent a significant cost portion of valve cost, and area source for potential leakage

Answer 16

True

Question 17

The internal elemets of a valve are collectively referred to as a ____

Answer 17

Valve’s trim

Question 18

True or False. The disk provides the capability for permitting and prohibiting fluid flow.

Answer 18

True

Question 19

True or False. Most valves are names, in part, according to the design of their disks.

Answer 19

True

Question 20

Provide the seating surface for the disk.

Answer 20

Seat or seal rings

Question 21

The actuator operates ___ and _____ assembly.

Answer 21

Stem and Disk

Question 22

True or false. Most valves use some form of packing to prevent leakage

Answer 22

True

Question 23

The primary pressure boundary of valve

Answer 23

The body

Question 24

Function simply as a valve covers

Answer 24

Bonnet

Question 25

A valve is a mechanical device that controls the flow of fluid and pressure _____ a system or process.

Answer 25

Within

Question 26

A valve controls system or process fluid flow and pressure by performing ____ of the following functions:
-Stopping and starting fluid flow
-Varying (throttling) the amount of fluid flow
-Controlling the direction of fluid flow
-Regulating downstream system or process pressure
- relieving component or piping over pressure

Answer 26

Any