product data sheet LEE 250 PRI® The Lee Company’s new 250 PRI pressure relief valve is the latest addition to Lee’s line of miniature pressure relief valve inserts. This new valve is ideally suited for low flow hydraulic applications where a miniature, light weight pressure relief valve is needed. The 250 PRI is only 1.1 inches long and weighs only 4.5 grams. A Lee Safety Screen is incorporated at the inlet of the valve for protection. Available in forward and reverse relief flow configurations, the 250 PRI is available in a wide range of standard cracking pressures from 80 to 3600 psid, and is constructed entirely of stainless steel for durability and long life. Each 250 PRI is 100% tested and inspected to ensure reliable, consistent performance. ■ Cracking Pressures Available from 80 to 3600 psid ■ Weighs only 4.5 grams ■ Lee Safety Screen Included for Added Protection ■ 100% Tested and Inspected ■ Endurance Tested to 100,000 Cycles Minimum Finish: All CRES Parts Passivated. Pins are prewaxed. Do not degrease. Do not lubricate. Valve performance on MIL-PRF-83282 or MIL-PRF-5606 at 85°F ±15°F * The Lohm is a measure of flow resistance. Additional information can be found on the reverse side or at www.TheLeeCo.com The lee company, 2 pettipaug rd., p.o. box 424, Westbrook, ct 06498-0424 PDS 113 6/11 Tel: 860-399-6281 Fax, Order Entry: 860-399-7058 Fax, Technical Information: 860-399-7037 Web: www.TheLeeCo.com

LOHMS LAWS (liquids) Every engineer will be interested in our simple system of defining the fluid resistance of Lee hydraulic components. Just as the OHM is used in the electrical industry, we find that we can use a liquid OHM or "Lohm" to good advantage on all hydraulic computations. When using the Lohm system, you can forget about coefficients of discharge and dimensional tolerances on drilled holes. These factors are automatically compensated for in the Lohm calculations, and confirmed by testing each component to establish flow tolerances. The resistance to flow of any fluid control component...