Water Distribution Level 4 Practice Exam 2025 – The Complete Guide to Mastering Your Certification!

Question: 1 / 400

How do compression type dry barrel hydrants open?

By turning a valve in the base

Against the flow of water in the show of the hydrant

Compression type dry barrel hydrants operate by opening against the flow of water in the barrel. This design allows for the hydrant to be drained, preventing water from being trapped in the barrel when not in use, which helps avoid freezing in cold climates.

When the operating nut is turned, it raises a valve that is located inside the hydrant against the pressure of the water coming from the supply line. The mechanism is specifically constructed to ensure that the valve remains closed until the handle is turned, effectively sealing the water in the upper section of the hydrant and ensuring that it does not leak during non-use.

This approach is vital for maintaining the functionality and safety of the hydrant system, particularly in areas prone to freezing temperatures, as it ensures that the hydrant can be used when required without freezing water causing potential damage.

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By a hand-activated lever

They automatically open when water flows

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