🔍 Key Concepts

• Relationship between orifice size and rate of flow in a small passage • How a diaphragm chamber fills/empties through a restricted opening • Difference between a device that changes final pressure versus one that affects timing or direction of pressure changes

💭 Think About

• Look at where point H is located: which two spaces is that small passage connecting, and what will flow through it when inlet pressure is applied? • If the passage at H were made larger or smaller, what would change first: the final pressure in chamber I, the direction of flow, or how fast the pressure in chamber I changes? • Imagine the air (or fluid) supply is turned on suddenly—what role would that tiny hole play in how quickly the diaphragm can move?

✅ Before You Answer

• Trace the flow path from INLET (II) to the space above the diaphragm (I) and see how H controls that path. • Decide whether H can actually block reverse flow like a check valve, or if it simply restricts flow in both directions. • Ask yourself: does H mainly determine pressure level, direction of flow, or the speed of diaphragm movement over time?