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Term Definition
Pressure Feed. In spray painting equipment, fluid flow caused by application of air or hydraulic pressure to paint.  
Pressure Gauge. 1. A gauge for measuring the pressure exerted by a liquid or a gas. 2. A device to measure the pressure of an explosive.  
Pressure Head. Force caused by the weight of a column or body of fluids; expressed in feet, inches or psi.  
Pressure Head. The amount of force created by a depth of one foot of water.  
Pressure Limiter. Device which remains closed until a certain pressure is reached and then opens and releases fluid to another part of system or breaks an electric circuit.  
Pressure Motor Control. High or low-pressure control connected into the electrical circuit and used to start and stop motor; it is activated by demand for refrigeration or for safety.  
Pressure Pot. see Pressure Feed Paint Tank.  
Pressure Rcing Valve. A valve which maintains fluid pressure uniformly on its outlet side as long as pressure on the inlet side is at or above a design pressure.  
Pressure Regulator, Evaporator. see Evaporator Pressure Regulator.  
Pressure Regulator. Automatic valve located between a compressor and evaporator outlet that is responsive to its own inlet pressure or to the evaporator or refrigerator temperature; it throttles the vapor flow when necessary to prevent the evaporator pressure from falling below a selected value.  
Pressure Regulator. A valve which controls water pressure in the supply line.  
Pressure Switch. An electric switch that is activated by a rise or drop in air or fluid pressure.  
Pressure Water Valve. Device used to control water flow; it is responsive to head pressure of refrigerating system.  
Pressure, Absolute. see Absolute Pressure.  
Pressure, Atmospheric. see Atmospheric Pressure.  
Pressure, Back. see Back Pressure.  
Pressure, Gauge. see Gauge Pressure.  
Pressure, Operating. Pressure at which a system is operating.  
Pressure, Suction. Pressure in low-pressure side of a refrigerating system.  
Pressure. Energy impact on a unit area; force or thrust on a surface.  
Pressure-Heat Diagram. Graph of refrigerant pressure, heat, and temperature properties; see Molliers diagram.  
Pressure-Operated Altitude Valve (POA Valve). Device which maintains a constant low-side pressure independent of altitude of operation.  
Pressure-Sensitive Adhesive. An adhesive that will adhere to a surface at room temperature by briefly applied pressure alone.  
Pressure-Treated Lumber. Lumber that has been impregnated with chemicals under pressure, for the purpose of retarding either decay or fire.  
Prestressed Beam. A horizontal structural member which has had a load applied to it to increase its effectiveness in resisting working loads.  
Prestressed Concrete Institute (PCI). 175 West Jackson Boulevard., Chicago, Illinois 60604, (312) 786-0300.  
Prestressed Concrete. Concrete in which the steel is stretched and anchored to compress the concrete.  
Prestressing. Applying compressive stress to a concrete structural member to increase its strength.  
Pretax Income. Net income or profit shown on income and expense statement before dction for Federal Taxes.  
Pretensioning. A method by which the design tensile force is applied to the steel reinforcing before the concrete is set.  

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