Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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What is the proper usage of a gate valve in a pipeline?

It can be partially opened
It should be regularly adjusted
It is used only when fully opened or fully closed
It is never used

The correct answer is: It is used only when fully opened or fully closed

A gate valve is specifically designed for on/off control of fluid flow in a pipeline, making it most effective when fully opened or fully closed. Unlike other types of valves, such as globe valves or ball valves, a gate valve is not suitable for throttling service or for regulating flow. This means that its operation is optimized in two states: either completely allowing the flow or completely stopping it. Partial opening can lead to erosion of the gate and cause it to malfunction, affecting its sealing capability. The proper use of a gate valve is critical for maintaining system integrity and performance, as improper usage can not only damage the valve but also lead to leaks and reduced efficiency in the pipeline system. Therefore, the emphasis on its operation being limited to fully open or fully closed conditions highlights the specific mechanical purpose of gate valves, which is to provide a straight-line flow with minimal pressure drop when opened.