Purpose of throttle valves?

• A. Regulate amount of flow
• B. Start/stop flow
• C. Block reverse flow
• D. Release pressure

Answer: (A)

Throttle valves regulate the flow by constricting the passage and allowing you to adjust the opening size. By turning or actuating the valve, you create a controlled resistance that creates a desired flow rate downstream, which is essential for matching process requirements and managing system pressures. They aren’t used to start or stop flow (that’s handled by fully open/closed valves), nor to block reverse flow (that’s a check valve’s job), nor to release pressure (that’s a relief valve’s role). So the primary purpose is to control how much fluid moves through the system.