🔍 Key Concepts

• Gate valve design and purpose in piping systems • Difference between on/off isolation valves and throttling/control valves • Effects of partially open gate valves on the valve seat and flow characteristics

💭 Think About

• Think about what the internal gate (disc) looks like and how it moves inside the valve body. Is it shaped for smooth control of flow, or mainly to stop/start flow? • Consider what can happen to the sealing surfaces and flow pattern if a gate valve is left partially open for long periods. • Look at the answer choices and ask: which one describes the primary intended service of a gate valve, not a special or rare case?

✅ Before You Answer

• Verify which type of valve (gate vs globe vs needle) is typically used to throttle flow in marine piping. • Confirm how manufacturers recommend operating a gate valve to avoid damage and erosion to the disc and seats. • Eliminate any options that describe a use that is too specialized (only one type of fluid or one mounting orientation) unless you know that is a standard requirement.