🔍 Key Concepts

• Function of a small orifice in a diaphragm chamber of a pressure‑control valve • Difference between a flow restriction and a one‑way (check) device • How changing the rate of pressure change affects valve or diaphragm movement

💭 Think About

• Look at where point H is located: does fluid pass freely through it, or is it restricted, and in which direction? • If pressure on one side of the diaphragm changes suddenly, what does a tiny hole at H do to the speed of that pressure change on the other side? • Which option best describes a device whose main job is to slow down motion or pressure changes, rather than stop reverse flow or raise pressure?

✅ Before You Answer

• Confirm that H is a small passage in the diaphragm area, not a spring‑loaded or moving element. • Decide whether H allows flow in both directions, just more slowly, or if it blocks one direction like a check valve. • Match that behavior to the choice that describes a controlled, gradual pressure change rather than simple pressure reduction or injection.