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Lee Springs COMPRESSION SPRINGS: LITE PRESSURETM SERIES
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Lee Spring

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Click here for Compression Stock Spring Tolerances and Engineering Notes.

Lite Pressure™ Compression Springs
Our Lite Pressure™ Compression Springs offer
the size you need without the added pressure.


This new Lite Pressure™ Series has been developed so that, for a given length and diameter (outside or inside), there would exist a series of springs that had lower spring rates or workable load ratings than what is currently offered by the existing Lee Spring Standard Series compression springs.

WHY "PRESSURE"?:
• Pressure is described as a force which is exerted over a surface area. In regards to compression springs, the pressure exerted as the result of a specific deflection can be more technically described as force over a flat surface with a circular perimeter (the Nominal Hole in which the spring is being used).
• The term "Lite Pressure™ " is used to describe a series of springs designed to be utilized where relatively low forces are required for a given diameter.

HOW PRESSURE RATING FOR LP SERIES WOULD BE USED:
• The pressure rating assigned to each item of the Lite Pressure™ series is a selection parameter to assist in meeting qualitative requirements or quantitative requirements.
• Each series is offered in a range from 1 to 5 psi pressure ratings, 1.5 to 5.5 psi or 5 to 15 psi pressure ratings.

POTENTIAL APPLICATIONS:
• LP series springs are ideal for many fluid power applications such as relief valves, check valves or pistons
• Other miscellaneous applications could include motor brushes, contacts, displays, syringes, toys, dispensers and many more

MATERIAL:
• LP series springs are offered ONLY in Type 316 Stainless Steel so as to provide a design that can meet requirements in various diverse applications that call for:
      • Improved corrosion resistance
      • Enhanced cleanliness
      • Moderately elevated temperatures

RELATIONSHIP TO FLUID PRESSURE:
The pressure ratings used for Lite Pressure™ Series springs have no direct relationship with "pressure" as traditionally used in the fluid power industry, although indirectly the pressure ratings are conceptually equivalent. Fluid pressure would be the result of a spring force acting over the specific area exposed to the fluid and would depend on other application components such as the valve face or the piston head

PRESSURE CALCULATION EXAMPLE:
Catalogue spring LP 014E 05 S316 has the following characteristics:
      Nominal Hole: 0.375 inch
      Free Length: 1.000 inch
      Solid Height: 0.143 inch
      Spring Rate: 0.161 lbs/inch

• The maximum recommended pressure for this spring will occur when the spring is at 80% of maximum available deflection (it is not generally recommended to use a compression spring all the way down to solid height).
• The maximum available deflection is the difference between the Free Length (1.000) and the Solid Height (0.143) or 1.000 - 0.143 = 0.857 inch.
• 80% of that would be 0.857 x 80% = 0.686 inch.
• The calculated load at this deflection would be the deflection (0.686) times the Spring Rate (0.161) or 0.686 inch x 0.161 lbs/inch = 0.110 lbs.
• The surface area over the Nominal Hole diameter (0.375) would be pi (pi) times the diameter squared divided by four or pi (pi) x (0.375²) / 4 = 0.110 in².
• The resultant pressure would then be determined by dividing the calculated load by the surface area or 0.110 lbs / 0.110 in² = 1 lb/in² (psi).

Material

Type 316 Stainless Steel

Finish
Passivated per ASTM A967
Ultrasonically cleaned

Tolerances on Spring Rate - ± 10%

Tolerances on Outside Diameter (for LP Series only):
0.201" - 0.300" ± 0.008"
0.301" - 0.500" ± 0.010"
0.501" - 0.850" ± 0.020"
0.851" - 1.125" ± 0.025"
1.126" - 1.460" ± 0.030"
1.461" - 1.625" ± 0.040"
1.688" - 1.937" ± 0.055"
1.938" - 2.375" ± 0.070"
2.376" - 2.875" ± 0.090"



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