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Home arrow Testing arrow Pressure Decay
Pressure Decay PDF Print E-mail

VGAGE specializes in application experience related to combining testing and gaging into a single machine. VGAGE is experianced in bringing you the ultimate in gaging and leak detection solutions, along with technically sound engineering, run-off and service support.

Pressure decay testing instruments are very useful for checking components that have relatively small volumes. The component is pressurized with air and the differential pressure transducer monitors the pressure for negative changes. Any pressure drop indicates a leak. The test is very fast, a matter of seconds, and is therefore popular in high-volume industries such as automotive components, castings, medical devices and consumer goods.

Gauge pressure decay - tests a component filled with air to a regulated pressure. This is achieved via the fill valve, which is opened until the test component is filled with air pressure supplied from the regulator. Then the fill valve is closed to isolate the pressure between the valve and the component. Leak detection occurs when the initial component test pressure changes over a period of time. The pressure change is monitored, calculated and then displayed in millibars. After the gauge pressure decay testing period the vent valve is operated to allow the test pressure to exhaust to atmosphere.

Accurate leak detection has a great impact on the safety and reliability of a product.  Reliable leak detection reduces cost by decreasing the number of warranty repairs and liability claims. Successful leak detection can protect against the loss of costly materials.
A leak detection instrument measures the amount of fluid, air or gas that it will pass under a given set of conditions.

That’s why it’s important to state both the leak rates and operating conditions for proper leak detection. Leak rate is often expressed as a product of pressure and volume per unit time.A true leak would not occur if the conditions were the same either side of the crack or hole, i.e. the gas or liquid would only diffuse through. Thus for a leak to occur, there must be a driving force.


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