What is the function of a valve? 6.1

• Used to start, stop, restrict, or control the flow

• Drain fluids and liquids from the system

What type of valve requires the hand wheel or motor to complete several revolutions to open or close the valve? 6.1

• Quater-turn valve

• Multi-turn valve

Which of the following are common multi-turn valves used in Saudi plants? 6.1

• Gate/Globe/Diaphragm

• Gate/Globe/NRCV Check valve

What is the function of a gate valve? 6.1

• Used for isolation purposes

• Used as a control valve

What type of valve is used for isolation? 6.1

• Gate valve

• Control valve

What type of valves are classified as control valves? 6.1

• Gate valve/Globe valve

• Globe/Diaphragm valve

What is the function of control valves? 6.1

• Valve is used to start or stop flow and throttle-control amount of flow

• Valve is used stop flow and throttle-control amount of flow

What type of valve operates much faster to close than multi-turn valves? 6.1

• Control valve

• Quarter-turn valve

What type of valve permits flow in one direction only? 6.1

• Non-return valve

• Quarter-turn valve

What is the function of a NRV valve? 6.1

• Non-return valve permits flow in two directions

• valve permits flow in one direction only