🔍 Key Concepts

• Remote valve operation using chains or reach rods • How an endless chain and chain wheel allow operation from a distance • Why chain operation is used when a valve is out of normal reach

💭 Think About

• Picture standing on deck at the operating position: which direction is the chain hanging, and where must the valve body be located relative to you? • Ask yourself: does an endless chain normally run horizontally like a bicycle chain, or vertically from overhead down to you? • Think about maintenance and access: which valve location would make sense to operate by chain rather than directly by hand?

✅ Before You Answer

• Verify which options describe a valve that is beyond normal hand reach from the deck position. • Check which direction (above, across, below) is most logically served by a hanging endless chain and wheel on the stem. • Eliminate any option that would make a simple handwheel or reach rod more practical than a chain-operated arrangement.