Engine 2014: Engineering Safety

1. A Valve bodies, discs, spindles, and seats must all be made of bronze or a corrosion resistant material.
2. B Pressure-vacuum valves for cargo tanks shall not be less than 2 inches nominal pipe size.
3. C Where springs are employed to actuate the valve discs, the  springs are to be either plated or fabricated of a corrosion resistant material.
4. D The design and construction of the valves is such that they must be removed for overhauling, insuring there will be no  vent blockage which could occur during a repair period.

Tip: press A-D to answer