Module J (160404)

Question 1

What does the valve marking WOG mean?

Answer 1

The valve marking WOG refers to water, oil and gas

Question 2

Which valve can be used for throttling?

Answer 2

Globe

Question 3

What is the purpose of a balance valve?

Answer 3

Less force is required to operate the valve, so smaller actuators may be used

Question 4

What 2 designs of operation are used to actuate valves?

Answer 4

1. Linear (reciprocating)
2. Rotary

Question 5

Identify 2 advantages of hydraulic actuators

Answer 5

1. Drive and operate heavier loads
2. More precise control

Question 6

What is the purpose of a rupture disc?

Answer 6

The disc ruptures at a pre-set pressure

Question 7

Why is valve lapping done on pipe valves?

Answer 7

Lapping two mating surfaces of a valve smooths and flattens the surfaces and makes the parts precisely fit each other

Question 8

What does the term “repacking” a valve encompass?

Answer 8

Remove old packing, inspect and clean valve spindle and stuffing box, then install new packing into the stuffing box. Complete by installing the gland flange (follower) and tighten down evenly

Question 9

Identify 4 types of NDT procedures used for testing valves and valve components

Answer 9

1. Dye penetrant
2. Magnetic particle
3. Radiography
4. Ultrasonic methods