product data sheet 281 ZERO LEAK PRI® The Lee Company's new 281 Zero Leak ■ PRI (Pressure Relief Insert) is the latest addition to Lee's line of miniature ■ pressure relief valves. This new valve is ideal for thermal relief and low flow hydraulic pressure relief applications ■ where zero leakage is needed. ■ The cracking pressure is preset at the factory with capabilities ranging from ■ 800 psid up to 4700 psid. Typical flow ■ rates range from a few mL's per minute for thermal relief applications, and up to 0.5 GPM for low flow pressure relief applications. Each Zero Leak PRI is 100% tested and inspected to ensure reliable, consistent performance. Please contact your local Lee Sales Engineer for assistance in solving your zero leak relief valve needs. Cracking Pressure from 800 - 4700 psid Zero Leakage in a One Minute Test; One Drop Per Hour Maximum Weighs only 6 grams Working Temperature from -65°F to +275°F 100% Tested and Inspected Endurance Tested to 100,000 Cycles Minimum Finish: All CRES Parts Passivated. The Lohm is a measure of flow resistance. Additional information Pins are prewaxed. Do not degrease. Do not lubricate. can be found on the reverse side and at www.TheLeeCo.com. The lee company, 2 pettipaug rd., p.o. box 424, Westbrook, ct 06498-0424 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...