Hydraulics Glossary: W

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A glossary of the key terms you may encounter when working with hydraulic systems. Introducing the letter '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.
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.
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). 
A wheel motor, also known as a wheel hub motor, wheel hub drive, hub motor or in-wheel motor is incorporated into the hub of a wheel and drives it directly.
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.
A hose containing wires to give added strength, increased dimensional stability; crush resistance.
The transfer of power from one state to another. The movement of weight over a specified distance.
The maximum pressure to which a hose will be subjected, including momentary surges in pressure, which can occur during service.

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