Oilers/Plant Tenders (HHC) Civil Service Practice Exam 2026 - Free Oilers & Plant Tenders Practice Questions and Study Guide

In the context of ammonia refrigeration systems, particularly when dealing with large horizontal compressors, it is essential to ensure proper maintenance and control of the oil flow. The presence of a shut-off valve in the feed line serves a critical function: it allows for the safe and efficient management of oil supply to the compressor.

When maintenance is required or if there are operational issues, having a valve that can shut off the oil flow is vital for preventing leaks and accidents. It also ensures that service technicians can isolate the oil supply without affecting the entire system, thereby enhancing safety during maintenance procedures.

While the other options like filters, automatic feeders, and pressure gauges are important components in their own rights, their roles are more about either monitoring or ensuring the quality and quantity of oil rather than providing a mechanism to control the flow of oil during routine functions or maintenance. Thus, the inclusion of a shut-off valve is particularly crucial in a gravity feed line feeding oil to a refrigeration compressor.