What is TRUE of pressure/vacuum valves?

Question 1 / 270705eccef9cbacbc34ba4d45c12

Question 1 of 270705eccef9cbacbc34ba4d45c12

Question 1 of 27070

What is TRUE of pressure/vacuum valves?

🔍 Key Concepts

• Pressure/vacuum (P/V) valves purpose on cargo tanks • Relationship between P/V valves and P/V breakers in the venting system • Standard maintenance and inspection expectations for safety devices

💭 Think About

• Think about what normally causes small pressure changes in a closed cargo tank and how the system handles them. • Consider which device should act first in normal operation: the P/V valve or the P/V breaker? Why would that order be safer? • Ask yourself whether safety‑critical valves on cargo tanks are typically left alone or kept in reliable condition by routine care.

✅ Before You Answer

• Verify which component is intended to handle routine, small volume breathing of the tank atmosphere. • Confirm that the set points for P/V valves are arranged so they act before any backup or emergency devices. • Remember that industry practice and regulations generally require regular inspection and cleaning of critical safety valves—check which options reflect that.

Question 1 of 27070

What is TRUE of pressure/vacuum valves?

They are designed to provide for the flow of small volumes of tank atmospheres caused by thermal variations in a cargo tank.

They should operate in advance of the pressure/vacuum breakers.

They should be kept in good working order by regular inspection and cleaning.

All of the above.

Question 1 / 270705eccef9cbacbc34ba4d45c12

Question 1 of 270705eccef9cbacbc34ba4d45c12

What is TRUE of pressure/vacuum valves?

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Question 1 of 27070

What is TRUE of pressure/vacuum valves?