Which two devices are the two common types of pressure control devices?

Which two devices are the two common types of pressure control devices?

• A. Pressure relief valve and Pressure governor
• B. Pressure relief valve and Vacuum gauge
• C. Thermometer and Barometer
• D. Pressure governor and Gauge glass

Answer: (A)

Controlling pressure in a system relies on devices that either prevent overpressure or actively regulate the pressure during operation. The two common pressure control devices are the pressure relief valve, which opens automatically when pressure hits a preset limit to vent fluid and protect the system, and the pressure governor, which maintains the desired pressure by adjusting flow or supply accordingly. The other options are measurement tools or indicators rather than control devices: a vacuum gauge measures low or negative pressure, a thermometer and barometer measure temperature and atmospheric pressure, and a gauge glass shows liquid level. This combination of safety and regulation functions explains why relief valve plus governor is the correct pairing.

Controlling pressure in a system relies on devices that either prevent overpressure or actively regulate the pressure during operation. The two common pressure control devices are the pressure relief valve, which opens automatically when pressure hits a preset limit to vent fluid and protect the system, and the pressure governor, which maintains the desired pressure by adjusting flow or supply accordingly. The other options are measurement tools or indicators rather than control devices: a vacuum gauge measures low or negative pressure, a thermometer and barometer measure temperature and atmospheric pressure, and a gauge glass shows liquid level. This combination of safety and regulation functions explains why relief valve plus governor is the correct pairing.