Parameter
|
Type
|
Description
|
---|---|---|
Fluid Pressure
|
Real (psi). Used in Cp calculation.
|
The fluid pressure differential across the valve in psi. It is equal to the upstream fluid pressure minus the downstream fluid pressure. The range is commonly from 0 to 9000.
|
Allowable Leakage
|
Real (inches cubed/minute). Used in Cq calculation.
|
The amount of fluid that is permitted to escape in inches cubed/minute refers to the allowable leaking when operating at the maximum rated gallons per minute. The range is commonly from 0.005 to 0.1.
|
Viscosity (xE-8)
|
Real (Lb Min/Sq In * E-8). Used in Cv calculation.
|
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.
|
Filter Size
|
Real (microns). Used in Cn calculation.
|
The system filter size in microns.
|
# Particles/Hr/GPM
|
Real (N10). Used in Cn calculation.
|
The number of particles (mg) under 10 micron per hour per GPM (N10). For more information, see Particle Quantities.
|
Flow Rate - Actual
|
Real (Gallons/Minute). Used in Cw calculation.
|
The actual flow in gallons/minute.
|
Rated Flow Rate
|
Real (Gallons/Minute). Used in Cn and Cw calculations.
|
The maximum rated flow in gallons/minute.
|
Surface Finish
|
Real (microinches). Used in Cf calculation.
|
Required only for the Poppet subcategory.
The surface finish in micro inches. Common values range from 0 to 100.
|
Seat Stress Ratio
|
Real (lb/sq in). Used in Cs calculation.
|
Required only for the Poppet subcategory.
The apparent seat stress is found by actual measurement or design specifications. Common values range from 1.0 to 1.5. It can be calculated by: Where: • SS = The seat stress. • PS = The fluid pressure. • DS = The diameter of the seat exposed to fluid pressure PS. • DM = The mean land width diameter. • LW = The land area width. |
Mean Diameter
|
Real (in). Used in Cdt calculation.
|
Required only for the Poppet subcategory.
The mean diameter of the poppet seat. Typical values range from 0 to 2 inches.
|
Land Width
|
Real (in). Used in Csw calculation.
|
Required only for the Poppet subcategory.
The land width of the poppet seat. The valid range is 0 to 0.6. Typical values range from 0.05 to 0.38.
|
Friction Coefficient
|
Real. Used in Cu calculation
|
Required only for the Sliding Action Valve, Spool subcategory.
The value to use for the friction coefficient. For more information, see Friction Coefficients.
|
Spool Clearance
|
Real (microinches). Used in Cb calculation.
|
Required only for the Sliding Action Valves, Spools subcategory.
The spool to sleeve clearance in microinches. Common values range from 400 to 1600.
|
Spool Diameter
|
Real (in). Used in Cds calculation.
|
Required only for the Sliding Action Valves, Spools subcategory.
The diameter of spool. Common values range from 1.0 to 3.4.
|
Cycles/Hour
|
Real
|
The number of cycles per hour. This value is required to convert failure ratings from failures per cycle to failures per hour.
|
[Derating Parameters]
|
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For more information, see Derating Parameters.
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