Refrigeration Plant Operator B Practice Test 2026 - Free Refrigeration Exam Questions and Study Guide

Question: 1 / 400

What is a king valve?

A filter in the refrigerant line

A liquid line stop valve

A king valve is accurately described as a liquid line stop valve, serving a crucial function in refrigeration systems. Its primary purpose is to control the flow of refrigerant within the liquid line, allowing operators to isolate specific sections of the system for maintenance or repair while still maintaining the overall integrity of the refrigeration cycle.

When the king valve is closed, it prevents refrigerant from passing through the section of the line downstream, which is particularly important when replacing components like a receiver or a drier. This capability allows for safe servicing without the risk of refrigerant escaping or the potential for system contamination.

Understanding the role of a king valve is essential for effective maintenance and operation of refrigeration systems, ensuring that technicians can work safely and efficiently without losing refrigerant or compromising system performance.

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A safety valve for the compressor

A type of expansion valve

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