Gas - Valves and Regulators Flashcards
What do the lubricated gas shut-off valve and spring loaded gas shut-off valve have in common?
Both open and close with a quarter of a turn.
Servo-operated and redundant gas valves are both types of _________ gas valves.
Combination.
In a servo-operated valve, the force that opens the main valve is caused by:
A. A solenoid.
B. Gas pressure from a regulator.
C. The inlet gas pressure of the valve.
D. A spring[][][][][][][][][][][][][][][][][][][][][][][][][]
B. Gas pressure from a regulator.
In a redundant gas valve, the force that opens the main valve is caused by:
A. A solenoid.
B. Gas pressure from the regulator.
C. The inlet gas pressure of the valve.
D. A Spring[][][][][][][][][][][][][][][][][][][][][][][][][]
C. The inlet gas pressure of the valve.
If the main gas valve of a redundant gas valve failed open with debris when the call for heat is satisfied, the main flame would:
A. Go out.
B. Keep burning until the flame safeguard lost the pilot flame.
C. Keep burning indefinitely[][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][]
A. Go out.
True or False?
Rod-and-tube type gas control valves are primarily used on service water heaters.
True.
True or False?
The invar rod expands more than the copper tube.
False.
True or False?
Hydraulically-operated valves use an expanding liquid inside a sensing bulb, capillary tube, and bellows.
True.
True or False?
Snap or clicker mechanisms are used to provide two positions of the valve, full open and completely closed.
True.
True or False?
ECO stands for energy cut-off.
True.
True or False?
A seismic valve once activated must be manually reset.
True.
True or False?
A cable release valve is always activated manually.
False.
Referring to the figure below, the letter “A” indicates which of the following?
A. Appliance shut-off valve.
B. “B” Cock[][][][][][][][][][][][][][]]
C. “B” Cock[][][][][][][][][][][][][][]]
D. Branch isolation valve[][]]

A. Appliance shut-off valve.
Referring to the figure below, the letter “C” indicates which of the following?
A. Appliance shut-off valve.
B. “A” Cock[][][][][][][][][][][][][][][]
C. “B” Cock[][][][][][][][][][][][][][]]
D. Branch isolation valve[][][]

C. “A” Cock.
Referring to the figure below, the letter “D” indicates which of the following?
A. Appliance shut-off valve.
B. “A” Cock[][][][][][][][][][][][][][][]
C. “B” Cock[][][][][][][][][][][][][][]]
D. Branch isolation valve[][]]

C. “B” Cock.
Referring to the figure below, the letter “B” indicates which of the following?
A. Appliance shut-off valve.
B. Pilot valve[][][][][][][][][][][][][]]
C. Safety shut-off valve[][][][]]
D. Branch isolation valve[][]]

C. Safety shut-off valve.
Referring to the figure below, the letter “E” indicates which of the following?
A. Appliance shut-off valve.
B. Appliance regulator[][][][][]
C. Automatic gas valve[][][][]]
D. Safety shut-off valve[][][][]]

B. Appliance regulator.
Referring to the figure below, when the reset button is depressed:
A. Only pilot gas can pass through the valve.
B. Only main gas can pass through the valve.
C. The igniter is energized and the main burner can light.
D. All the gas flow is interrupted until the thermocouple reaches temperature.

A. Only pilot gas can pass through the valve.
Referring to the figure below, a weak magnet will cause the valve to:
A. Fail in the open position.
B. Shut off the power to the thermocouple.
C. Close the reset button to block gas flow[]
D. Shut off all gas flow[][][][][][][][][][][][][][][][][][][][]

D. Shut off all gas flow.
Referring to the figure below, this valve can be mounted:
A. In any vertical or horizontal position.
B. Only in the horizontal upright position.
C. In any vertical position[][][][][][][][][][][][][][][]
D. In a horizontal position with a rotation of up to 90°

B. Only in the horizontal upright position.
Referring to the figure below, installing the valve backwards in the gas line could result in:
A. Gas leaking through the valve when it is not energized.
B. No gas flow when the valve is energized[][][][][][][][][][][][][]]
C. Gas pressure holding the valve closed and it will never open.
D. Continuous uninterrupted gas flow at all times[][][][][][][][][][][][][][]]

A. Gas leaking through the valve when it is not energized.
Referring to the figure below, this valve is known as:
A. Diaphram gas valve.
B. Servo gas valve[][][][]]
C. Redundant gas valve.
D. Solenoid valve[][][][][]]

D. Solenoid valve.
Referring to the figure below, this valve is known as:
A. Diaphram gas valve.
B. Servo gas valve[][][][]
C. Redundant gas valve.
D. Solenoid valve[][][][][][]

A. Diaphram gas valve.
Referring to the figure below, if the pressure port is plugged on installation of the valve:
A. The valve will never fully open.
B. The valve will never tightly close.
C. The valve will not accurately control manifold pressure.
D. The valve will respond very slowly to a call for heat[][][][]

B. The valve will never tightly close.





































