If shut-off valves are installed on a water column, they must be sealed in the open position, and must be ___________ valves:

If shut-off valves are installed on a water column, they must be sealed in the open position, and must be ___________ valves:

If shut-off valves are installed on a water column, they must be sealed in the open position, and must be ___________ valves:




a. Outside screw and yoke rising spindle gate
b. Inside screw and yoke rising spindle gate
c. Non-rising spindle gate
d. Outside screw and yoke rising spindle globe
e. Rising spindle globe




Answer: A


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