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| Ram |
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A single-acting cylinder with a single diameter plunger rather than a piston and rod. The plunger in a ram-type cylinder.
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| Receiver |
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Head of a scanner that monitors the infrared signals transmitted by the transmitter head.
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| Reciprocation |
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Back-and-forth straight line motion or oscillation.
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| Recoverable heat |
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Heat energy from combustion that is actually recovered to do useful work.
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| Recovery |
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1. Product recovery: An expression of the amount of product (nominal or actual) that can be
manufactured from a given input of raw material.
2. Logging recovery: The volume or weight of logs that can be harvested from a given volume of
standing timber.
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| Recovery boiler |
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A boiler that recovers process chemicals for re-use and creates process steam with the heat it generates.
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| Refractory lining |
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A lining, usually of ceramic, capable of resisting and maintaining high temperatures.
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| Regenerative circuit |
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A piping arrangement for a differential type cylinder in which discharge fluid from the rod end combines with pump delivery to be directed into the head end.
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| Relative humidity |
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Ratio of the amount of water vapour present in the air to that which the air would hold at saturation at the same temperature. It is usually considered on the basis of the weight of the vapour but, for accuracy, should be considered on the basis of vapour pressures.
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| Relief valve |
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A pressure operated valve which by-passes pump delivery to the reservoir, limiting system pressure to a predetermined maximum value.
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| Replenish |
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To add fluid to maintain a full hydraulic system.
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| Reserve margin |
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The amount by which the utility's total electric power capacity exceeds maximum electric demand.
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| Residues (Biomass) |
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Byproducts from processing all forms of biomass that have significant energy potential. Because these residues are already collected at the point of processing, they can be convenient and relatively inexpensive sources of biomass for energy.
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| Resin |
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An ingredient of coatings which acts as a binder and gives the coating physical properties such as hardness and durability.
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| Resolution |
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The smallest unit used for taking measurements from a scanner or the encoder.
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| Restriction |
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A reduced cross-sectional area in a line or passage which produces a pressure drop.
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| Return line |
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A line used to carry exhaust fluid from the actuator back to sump.
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| Return on investment (ROI) |
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The interest rate at which the net present value of a project is zero. Multiple values are possible.
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| Reversing valve |
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A four-way directional valve used to reverse a double-acting cylinder or reversible motor.
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| Roller |
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A cylindrical body movable about its longitudinal axis.
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| Rotary actuator |
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A device for converting hydraulic energy into rotary motion - a hydraulic motor.
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| RPM |
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Revolutions per minute.
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| RTD |
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A temperature measuring device that measures the change in electrical resistance to determine temperature (resistive thermal device).
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| Rung |
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An element of the PLC ladder logic program. Each rung looks at input signals and turns output signals on or off. The program runs by scanning the ladder logic, testing the input points and the instructions on each rung, and turning the output points on or off.
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