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| Open center circuit |
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One in which pump delivery flows freely through the system and back to the reservoir in neutral.
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| Open center valve |
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One in which all ports are interconnected and open to each other in the center or neutral position.
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| Orifice |
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A restriction, the length of which is small in respect to its cross-sectional dimensions.
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| Oxygenate |
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An oxygenate is a compound which contains oxygen in its molecular structure. Ethanol and biodiesel act as oxygenates when they are blended with conventional fuels. Oxygenated fuel improves combustion efficiency and reduces tailpipe emissions of CO.
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