PRODUCT DATA SHEET 687 SIDE EXIT PRV The Lee Company’s new 687 Side Exit PRV is the latest addition to Lee’s line of field proven Pressure Relief Valves. This new valve is ideally suited for hydraulic applications where a fast opening safety relief valve is needed to prevent system damage from pressure spikes. Offered with or without an integral safety screen, the 687 PRV is available in a range of minimum cracking pressures from 400 to 3600 psid. Each Lee Pressure Relief Valve is 100% tested and inspected to ensure reliable, consistent ■ Cracking Pressures from 400 to 3600 psid ■ Inlet Safety Screen Available ■ Designed for System Proof Pressures up to 4500 psi ■ Weighs Only 39 Grams ■ Endurance Tested to 100,000 Cycles Minimum Nominal System Pressure: up to 3000 psi System Proof Pressure: 4500 psi maximum Nominal Weight: 38 grams (unscreened) 39 grams (screened) Valve performance on MIL-PRF-83282 or MIL-PRF-5606 at 85° F +/- 15° F The Lee Company • 2 Pettipaug Road, PO Box 424, Westbrook, Connecticut 06498-0424 Tel: 860-399-6281 • Fax: 860-399-7037 • [email protected] • www.theleeco.com

LEE LOHM LAWS 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...