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Absolute pressure |
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Definition
The addition of gauge pressure and atmospheric pressure. Usually indicated as psia.
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Term |
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Atmospheric pressure |
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Definition
Pressure exerted by the weight of the atmosphere. Decreases as the elevation above sea level increases (14.7 psi / 407” water column at sea level).
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Term |
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By-pass |
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Definition
A central calibrated orifice used on selected flow regulator models to maximize flow at low pressure.
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Dynamic Pressure |
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Definition
Refers to the pressure level (psi) when there is an actual flow.
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Term |
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EPAct 1992 |
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Definition
The Energy Policy and Conservation Act of 1975 (EPCA) amended by the Energy Policy Act of 1992 (EPAct 92) created the Energy Conservation Program for Consumer Products covering (among other products) faucets and showers.
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Term |
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Flow regulator |
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Definition
Pressure compensating flow regulators maintain a constant flow rate regardless of variations in line pressure. Precise flow control improves system performance and in the case of plumbing systems provides comfort of use at low pressure as well as water and energy saving at high pressure.
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Term |
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Flow restrictor |
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Definition
Refers to a fixed orifice. A restrictor produces higher flow at higher pressure (excess flow) and lower flow at lower pressure (insufficient flow).
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Flow tolerance |
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Definition
Refers to the deviation from Nominal Flow of a pressure compensating flow regulator tolerated across the pressure range once the threshold pressure is reached. In general the flow tolerance is +/-10%.
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Term |
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Gauge pressure |
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Definition
Pressure read on a pressure gauge. Measures only the amount of pressure above (or below) the atmospheric pressure. Pressure values given in this website are gauge pressures (psig).
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Hysteresis |
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Definition
Refers to the changes in a performance curve, for instance the headloss curve (psid) of a spring loaded check valve, when plotted against increasing or decreasing flow (gpm).
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Term |
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Medium |
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Definition
Refers to the fluid used in the application. NEOPERL flow regulators and check valves are designed for clear water applications (check valves are also functional in air applications).
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Term |
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Nominal Flow |
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Definition
Refers to the target flow rate of a regulator. Flow regulators can meet specific performance requirements such as an upper flow rate limit (Ex: 2.5 gpm max for shower applications).
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Term |
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Pressure differential |
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Definition
Refers to the difference of pressure between the inlet and outlet of a valve or system.
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Regulator |
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Definition
See “Flow regulator”
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Restrictor |
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Definition
See “Flow restrictor”
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Static pressure |
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Definition
Refers to the pressure level (psi) when there is no flow.
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Term |
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Threshold pressure |
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Definition
Refers to the pressure at which the flow regulator effectively begins controlling the flow. Standard regulators begin controlling at 15 psi. Special models (low pressure flow regulators) can begin controlling as early as 3 psi.
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Water conservation |
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Definition
The adoption of the Energy Policy and Conservation Act (EPACT ‘92) resulted in statutory requirements with respect to plumbing products (A112.18.1M) being included in the Code of Federal Regulations (CFR) and monitored by the Department of Energy (DOE).
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Working conditions |
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Definition
Refers to the usual parameters of the application such as medium, pressure range and temperature range.
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