A device that is used to divert water at the intersections of roofs or at the intersection of a roof and chimney.
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PODBIELNIAK EXTRACTOR
A solventextraction device in which centrifugal action enhances liquid-liquid contact and increases resultant separation efficiency.
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PNEUMATIC CONTROLLER
A device for the mechanical movement of another device (such as a valve stem) whose action is controlled by variations in pneumatic pressure connected to the controller.
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PNPN DIODE
A semiconductor device consisting of four alternate layers of p-type and n-type semiconductor material, with terminal connections to the two outer layers. Also known as npnp diode.
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PLUG CUTTER
A device for boring out short dowels or plugs from wood that exactly match standard drill sizes.
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PLATE-TYPE EXCHANGER
Heat-exchange device similar to a plate-and-frame filter press; fluids flow between the frame-held plates, transferring heat between them.
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PLASTICORDER
Laboratory device used to predict the performance of a plastic material by measurement of temperature, viscosity, and shear-rate relationships. Also known as plastigraph.
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PITOT-VENTURI FLOW ELEMENT
Liquid-flow measurement device in which a pair of concentric venturi elements replaces the pitot-tube probe.
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PISTON VISCOMETER
A device for the measurement of viscosity by the timed fall of a piston through the liquid being tested.
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PIPE CUTTER
A hand tool consisting of a clamplike device with three cutting wheels which are forced inward by screw pressure to cut into a pipe as the tool is rotated around the pipe circumference.
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PILOT WIRE REGULATOR
Automatic device for controlling adjustable gains or losses associated with transmission circuits to compensate for transmission changes caused by temperature variations, the control usually depending upon the resistance of a conductor or pilot wire having substantially the same temperature conditions as the conductors of the circuits being regulated.
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