Entering Seals
The following table describes the part parameters required for seals. This includes the following subcategories:
• Seal, Dynamic Spring
• Seal, Static, Gasket
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Parameter
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Type
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Description
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|---|---|---|
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Meyer Hardness
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Real (psi). Used in Ch calculation.
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The Meyer Hardness factor in pounds per square inch (psi). Young's modulus is equivalent to Meyer's hardness for rigid material. Meyer’s hardness can be calculated using the following equation:  Where: • Pf = The load applied to the sample in pounds (lbs). • Din = The diameter of indentation of sample in inches (in). |
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Contact Pressure
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Real (psi). Used in Ch calculation.
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The minimum contact pressure in psi. For ranges for common seal materials, see Contact Pressure Values. You can also calculate the minimum contact pressure using the following equation:  Where: • C = The contact pressure in psi. • FC = The force compressing seals in lbs. • ASC = The area of seals in square inches. |
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Surface Finish
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Real (microinches). Used in Cf calculation.
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The surface finish in micro inches. Common values range from 0 to 100.
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# Particles/Hr/GPM
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Real (N10). Used in Cn calculation.
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The number of particles (mg) under 10 micron per hour per GPM (N10). For more information, see Particle Quantities.
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Allowable Leakage
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Real (inches cubed/minute/Max Rated GPM). Used in Cq calculation.
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The allowable leakage in inches cubed/minute/Max Rated GPM. The range is commonly from 0.005 to 0.1.
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Actual PV
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Real. Used in Cpv calculation.
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Required only for the Seal, Dynamic Spring subcategory.
The pressure-velocity coefficient factor of the actual seal operation. The pressure velocity (PV) can be calculated using the following equation:  Where: • DP = The pressure differential across seal face in psi. • b = The seal balance; ratio of hydraulic closing area to seal face area. • Fsp = The seal spring load in lbs. • A0 = The seal face area in inches squared. • Vm = The velocity at the seal mean diameter in ft/min. |
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Rated PV
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Real. Used in Cpv calculation.
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Required only for the Seal, Dynamic Spring subcategory.
The pressure-velocity coefficient factor of the original design. This indicates the effect of wear from seal face pressure and fluid velocity. For the equation, see the previous description.
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Inner Seal Diameter
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Real (in). Used in Cdl calculation.
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Required only for the Seal, Static, Gasket subcategory.
The diameter of the inner seal in inches. Common values range from 0 to 2.
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Fluid Pressure
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Real (psi). Used in Cp calculation.
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Required only for the Seal, Static, Gasket subcategory.
The fluid pressure in psi. Range is commonly from 0 to 9000.
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Filter Size
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Real (microns). Used in Cn calculation.
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The system filter size in microns.
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Viscosity (xE-8)
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Real (Lb Min/Sq In * E-8). Used in Cv calculation.
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The viscosity of the fluid. Entered values are multiplied by 1E-8 to obtain actual viscosity. Fluid viscosity changes with temperature. For more information, see Viscosity.
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Temperature Rise
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Real (Degrees C). Used in Ct calculation.
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The temperature rise from the ambient subassembly temperature to this component. The temperature rise plus the ambient temperature is equal to the operating temperature of the device.
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Rated Temperature
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Real (Degrees C). Used in Ct calculation.
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The maximum temperature rating specified by the manufacturer or the maximum design temperature. For more information, see Rated Temperatures.
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Rated Flow Rate
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Real (Gallons/Minute). Used in Cn calculation.
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The maximum rated flow in gallons/minute.
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[Derating Parameters]
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For more information, see Derating Parameters.
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