F01 Sprinkler System Control Valves 2

Question 1

What is the function of the main sprinkler system shut-off valve (OS&Y valve) in a building?

Accepted Answer

It is the primary valve that controls water supply to the entire sprinkler system or a major portion of it

Answer

It controls individual sprinkler heads in a single zone

Answer

It is a test valve used only during annual inspections

Answer

It controls the water pressure entering the building from the city main

Question 2

What does a tamper switch on a sprinkler control valve do?

Accepted Answer

Sends a supervisory alarm signal to the fire alarm panel if the valve is moved from its fully open position

Answer

Prevents unauthorized persons from opening the valve

Answer

Automatically closes the valve during a fire to prevent water damage

Answer

Measures water flow through the valve during a fire

Question 3

What visual indicator on an OS&Y gate valve confirms that the valve is in the fully open position?

Accepted Answer

The threaded screw stem is fully extended outward from the yoke

Answer

The valve handle points upward

Answer

The valve body has a green painted marking

Answer

The valve makes a steady humming sound when water flows

Question 4

During a fire watch, an F-01 fireguard discovers a sprinkler control valve that appears partially closed but has no out-of-service tag. What action is required?

Accepted Answer

Do not touch the valve — immediately notify the impairment coordinator and building management

Answer

Open the valve fully to restore system pressure

Answer

Close the valve fully and place a handwritten tag on it

Answer

Continue patrol and report the valve condition at the end of the shift

Question 5

Why are sprinkler control valves typically required to be secured in the open position (chained, locked, or supervised)?

Accepted Answer

To prevent accidental or unauthorized closure, which would impair the sprinkler system without detection

Answer

To prevent water hammer when the system activates during a fire

Answer

To reduce water pressure fluctuations in the system

Answer

To comply with aesthetic building code requirements

Question 6

An inspector finds that a sprinkler zone control valve was left in the half-open position after maintenance work completed three days ago. What potential fire safety impact does this have?

Accepted Answer

The zone has been operating at reduced water pressure and flow for three days, potentially inadequate to control a fire — a full investigation and system test is required

Answer

No impact — a half-open valve still allows some water to flow during a fire

Answer

The valve was probably half-open intentionally for pressure balancing

Answer

This is a minor issue requiring only a logbook note