Which of the following statements concerning...

🔍 Key Concepts

• Steam pressure reducing valve purpose and operation – what they do to high-pressure steam before it goes to users • Thermal expansion and condensate – what happens inside steam lines/valves when they are first opened or heated • Routine safety and maintenance practices – what is realistic and required versus unsafe or impractical procedures

💭 Think About

• Think about what must be done to any steam component before putting it under pressure so it is not damaged by water hammer or thermal shock. • Consider whether throttling a valve downstream of an automatic pressure-reducing valve helps it control pressure, or can interfere with its operation. • Ask yourself if any steam safety/relief device is truly “absolutely reliable” and whether regulations and good practice assume that.

✅ Before You Answer

• Verify which action deals with condensate removal and gradual heating of the valve body and internals. • Check whether downstream throttling of an automatic pressure control device is normally recommended or discouraged in steam systems. • Eliminate any option that suggests no maintenance or unrealistic testing frequency that doesn’t align with normal engineering practice and safety culture.

Which of the following statements concerning the operation of steam pressure reducing valves is correct?

Reducing station relief valves must be lifted by hand at least once a watch.

The cut out valve at the outlet of the reducing valve should be throttled when in operation.

Reducing valves should be warmed-up and drained before they are adjusted.

Reducing valves are absolutely reliable and require no routine maintenance.

🔍 Key Concepts

💭 Think About

✅ Before You Answer