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    Hydraulics Glossary – O

    A circular seal made from synthetic material.

    A hydraulic system in which the flow of the pump has a free-flow passageway through the system and back to the reservoir, while in the neutral condition.

    One in which all ports are interconnected and open to each other in the centre or neutral position. Open centre hydraulic valves are the same as the tandem centre, except that in the neutral position all lines are connected back to the reservoir. The primary use of this system is to prevent “shock” loading when the valve is placed in neutral. This takes pressure off the hydraulic motor. This system is used in situations where the operating device needs to be moved by hand.

    A circuit in which there is no complete path for electrical current flow.

    The maximum pressure that a system or component will experience during operation at the maximum expected fluid pressure.

    An opening or passageway which can have tapered edges.

    The output of a hydraulic pump (gallons per minute, or GPM) is related directly to its operating speed. The pressure of a hydraulic pump is determined by its manufactured capabilities.

    A spool or other device that is controlled by a torque motor or smaller spool.

    The absorption of oxygen into fluid and the plating of the oxygen/fluid mixture onto metal surfaces.

    Substance added in small quantities to petroleum products to increase its oxidation resistance.

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    This is a system generated translation and as such will not be fully accurate. We are not responsible for incorrect or inaccurate translations and will not be held responsible for any damage or issues that may result from using this service.