Which component is a small opening that controls flow rate in a pipe?

Which component is a small opening that controls flow rate in a pipe?

• A. Orifice
• B. Vent
• C. Drain
• D. Caps

Answer: (A)

Controlling flow in a pipe often relies on introducing a small restriction that sets how much fluid can pass for a given pressure difference. An orifice is exactly that—a small opening that creates a controlled restriction. Because the bore is fixed, it meters flow by the pressure drop across the opening, and the flow rate depends mainly on the opening size and the pressure difference, with no moving parts involved. This is why it’s used as a simple way to throttle or meter flow. The other options don’t regulate flow through the pipe in the same way: a vent releases air or gas to the atmosphere, a drain removes liquid from a system, and caps seal an opening to stop flow.

Controlling flow in a pipe often relies on introducing a small restriction that sets how much fluid can pass for a given pressure difference. An orifice is exactly that—a small opening that creates a controlled restriction. Because the bore is fixed, it meters flow by the pressure drop across the opening, and the flow rate depends mainly on the opening size and the pressure difference, with no moving parts involved. This is why it’s used as a simple way to throttle or meter flow. The other options don’t regulate flow through the pipe in the same way: a vent releases air or gas to the atmosphere, a drain removes liquid from a system, and caps seal an opening to stop flow.