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| Preservation district
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Zoning designation covering a sensitive environmental area, parkland, scenic area or historic district, and placing especially strict limitations on private landowners' and nonowners' freedom to change the essential character of sites within the district. |
| Preservative
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Chemical that protects from deterioration, rot or infestation of materials, such as wood. Copper napthenate and pentachlorophenol are commonly used as preservative for wood that is exposed to such conditions. |
| Press brake
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A mechanical device used to form sheet metal into desired shapes and profiles. |
| Pressed brick
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Brick that is molded under pressure, causing it to be uniform and strong. |
| Pressure
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(1) Force exerted upon an opposing body. (2) Compression; squeezing. (3) A condition of distress. |
| Pressure balance valve
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Valve which keeps hot and cold water at the proper temperature and pressure by use of a diaphragm inside the faucet which reacts to increase or decrease the flow to keep it constant. |
| Pressure balancing
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The process of neutralizing pressure differences within a home. |
| Pressure drop
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The loss in static pressure of a fluid (liquid or gas) in a system due to friction from obstructions in pipes, from valves, fittings, regulators, burners, etc, or by a breech or rupture of the system. Pressurization Testing. |
| Pressure gas welding
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Oxyfuel welding process, which can be used in automated welding operations, which heats the surface to the proper temperature and then fuses the parts under sufficient pressure, without use of filler metal. |
| Pressure gauge
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Apparatus to measure the amount of pressure exerted by fluids and gas and are used in systems that have dynamic operating characteristics so that changes must be monitored. |
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