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Glossary of Terms - All Terms

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Glossary Subsets

UL (Underwriter Laboratories)

An independent lab which certifies not only safety but function of electrical devices used in the U.S.A.

Unload

To release flow to prevent pressure being imposed on the system or a portion of the system.

Uninteruptabile Power Supply (UPS)

• A device to insure a constant power to critical circuits such as computer banks, or hospital lighting.
• Very susceptible to spikes and surges.

Unloading Valve

A valve which bypasses flow to tank when a set pressure is maintained on its pilot port.