Gas Fitter Practice Test

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When should a relief valve on a regulator operate?

  1. When the system pressure falls below the regulator set point

  2. When it senses pressure at 4 times the regulator set point

  3. When there is excessive pressure in the supply piping

  4. When the inlet pressure drops below set point

The correct answer is: When there is excessive pressure in the supply piping

The relief valve on a regulator is designed to protect the system from excessive pressure buildup. It operates in situations where the pressure in the supply piping exceeds safe limits, which can occur due to factors such as thermal expansion, blockages, or other system malfunctions. When the relief valve activates, it releases excess pressure to prevent damage to the system components, ensuring safe operation. While other choices pertain to pressure levels in relation to the regulator's set point, they don't accurately reflect the function of the relief valve, which is specifically intended to address conditions of excess pressure rather than low pressure scenarios or conditions within regular operating parameters.

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