Relief Valve Failure

relief valve
safety valve: a valve in a container in which pressure can build up (as a steam boiler); it opens automatically when the pressure reaches a dangerous level
Used at the discharge of a positive displacement pump. An adjustable, spring-loaded valve opens when a preset pressure is reached. Used to prevent excessive pressure buildup that could damage the pump or motor.
The relief valve (RV) is a type of valve used to control or limit the pressure in a system or vessel which can build up by a process upset, instrument or equipment failure, or fire.

failure
Lack of success in passing an examination or test
an act that fails; "his failure to pass the test"
lack of success; "he felt that his entire life had been a failure"; "that year there was a crop failure"
Lack of success
An unsuccessful person, enterprise, or thing
an event that does not accomplish its intended purpose; "the surprise party was a complete failure"