Glossary and index of fluid power principles and components

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W

WAFER VALVE
A two way valve that may be opened or closed to block the flow of fluid in a passage. Normally manually operated, but may be automated, especially for larger sizes. Normally designed so that when open, the opening of the passage is only restricted by the thickness of the wafer. There will be some pressure loss. See GATE VALVE, GLOBE VALVE and NEEDLE VALVE.

WATER GLYCOL FLUID
A hydraulic fluid that is comprised of a mix of distilled or other pure water and glycol to form a fluid that has enough lubricity to function as a fluid power fluid, but is relatively fire-resistant, i.e., will not support combustion.

WATT'S LAW
States that when one amp. of current flow through a device with one volt voltage drop, one watt of power is dissipated in the form of heat(P = I x E).

WEATHERING
The surface deterioration of a hose cover during outdoor exposure, as shown by checking, cracking, crazing, and chalking.

WIPER RING
A rubber or other synthetic seal that is fitted around a moving shaft to form a low pressure seal. Normally used to prevent fluid from entering the sealed volume.

WIRE REINFORCED
A hose containing wires to give added strength, increased dimensional stability; crush resitance. See reinforcement.
 
WORK
The transfer of power from one state to another. The movement of weight over a specified distance.

WORKING PRESSURE
The maximum pressure to which a hose will be subjected, including momentary surges in pressure, which can occur during service.

WRAPPED CURE
A vulcanizing process using a tensioned wrapper, usually of fabric, to apply external pressure.