HVAC Journeyman Practice Exam 2025 - Free HVAC Practice Questions and Study Guide

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What is the purpose of a blow-off valve in a gas system?

To relieve excess pressure

The primary function of a blow-off valve in a gas system is to relieve excess pressure. This is crucial for maintaining system safety and integrity. When the pressure within the gas system exceeds a predetermined level, the blow-off valve activates to vent the excess gas. This helps to prevent potential hazards such as leaks, ruptures, or explosions that could occur if the pressure remains too high. By allowing controlled release of gas, the blow-off valve ensures that the system operates within safe pressure limits.

In contrast, distributing gas evenly is typically managed by other components such as regulators and manifolds, while measuring gas temperature is an entirely different function handled by temperature sensors. Enhancing gas flow rate involves several design elements of piping and pressure regulation rather than the specific function of a blow-off valve.

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To distribute gas evenly

To measure gas temperature

To enhance gas flow rate

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