K1-K2 Assignments

Question 1

List the three main categories into which pressure regulators fall and state where they are used.

Answer 1

1. service regulators: at a gas meter to reduce service pressure
2. system regulator: downstream of service and upstream of appliance regulator
3. appliance regulator: at appliance

Question 2

List and define the three essential elements of a regulator:

Answer 2

1. loading element: usually a spring
2. measuring: usually a diaphragm
3. restricting: a valve, disc or plug

Question 3

T or F

Regulators respond to a change in downstream flow without any change in downstream pressure.

Answer 3

False

Question 4

______ is the desired downstream pressure

Answer 4

set point

Question 5

______ is the pressure above set point that is needed to shut off tight

Answer 5

lock up

Question 6

_____ is the downstream pressure drop below set point

Answer 6

droop

Question 7

With a larger orifice in the regulator a specific change in downstream pressure produces a smaller change in flow rate than it would with a smaller orifice. True or false. explain your answer

Answer 7

false

more gas going through it

Question 8

List and describe four effects that too large an orifice would have in a regulator.

Answer 8

1. cycling: open and close repeatedly
2. bathtub stopper effect: disc slamming into orifice
3. higher lockup pressure
4. faster wear on valve disc