Which component provides manual control when the automatic regulator fails by bypassing the automatic regulation path?

• A. Bypass valve
• B. Unloading valve
• C. Make-up valve
• D. Gland seal regulating station

Answer: (A)

Providing manual control when the automatic regulator fails is achieved by a bypass valve, which creates a direct manual path that bypasses the automatic regulation circuitry. When the automatic regulator is out of service, you can open this bypass to set the controlled variable (flow or pressure) manually, ensuring the system continues to operate.

The other components serve different functions and do not offer a direct manual bypass of the regulator: the unloading valve is used to reduce load in the system under certain conditions, not to bypass the regulator; the make-up valve adds water to maintain proper levels, not to override regulation; the gland seal regulating station controls the supply of gland steam, which is unrelated to bypassing the automatic control path.