Integral two-stage regulators shall NOT incorporate which feature in the high-pressure regulator portion?

Integral two-stage regulators are designed to efficiently reduce high inlet pressures to lower outlet pressures while maintaining performance and safety. The high-pressure regulator portion of these devices typically manages the initial pressure reduction.

One important characteristic of high-pressure regulators is that they do not incorporate a pressure relief valve. This is because the function of a pressure relief valve is to vent excess pressure, which is unnecessary in this stage of pressure regulation since the design aims to control and stabilize pressure within pre-established limits. If there were a pressure relief valve in the high-pressure section, it could lead to overpressure situations, thereby compromising the regulated flow and safety of the system.

The features typically present in high-pressure regulators include automatic shutoff, which helps prevent gas from being released if the regulator fails, as well as manual control for operators to adjust gas flow intentionally. Additionally, a bypass line may be included to allow for service on the system without completely shutting down operations.

In summary, the absence of a pressure relief valve in the high-pressure regulator is central to the design and functioning of integral two-stage regulators, as it ensures safety and effective pressure management in propane gas systems.