What is pressure?

pressure test

Glossary “pressure test” Definition:
Procedure for testing the entire cooling system for leaks. Or, a test to tell if the A/T is experiencing internal leakage or requires adjustment to the linkage or vacuum modulator. May also refer to the pressure applied to an evaporative emission system to check for leaks. This would be used to perform an evaporative system integrity test.

pressure tester

Glossary “pressure tester” Definition:
Device used to pressure test the cooling system and pressure cap. Can also refer to any piece of equipment that is used to externally apply a pressure to a system, for the purpose of testing its integrity.

pressure relief valve

Glossary “pressure relief valve” Definition:
1). A valve held closed by a spring or other means, which automatically relieves pressure in excess of its setting. 2). Carburetor fuel bowl vent operated by vapor pressure from evaporated fuel. 3). AIR system valve that functions to relieve pump-output pressure that exceeds a predetermined amount. 4). Valve in an engine oil pump having a calibrated spring working against a moveable plunger or ball to regulate maximum oil pressure.