PRECISION MICROHYDRAULICS PRODUCT DATA SHEET The Lee Company’s new 375 HD PRI, Hi-Damped Pressure Relief Insert, has been designed for applications where stability is a must. Dual dampening chambers provide an extremely stable relief flow over various flow rates and pressure combinations. It features a rugged 440C Poppet and Seat for durability and long life. Available in forward and reverse relief flow directions, the 375 HD PRI offers a range of cracking pressures for 3000, 4000 and 5000 psi systems with system peak pressures up to 6750 psi. Each relief valve is 100% tested and inspected to ensure reliable, consistent performance. ■ Extremely stable relief flow over various flow rates and pressure combinations ■ Durable 440C Poppet and Seat ■ Designed for system pressures up to 5000 psi ■ Weighs only 21 grams ■ Endurance tested to 100,000 cycles minimum Finish: AH CRES Parts Passivated. Pins are prewaxed. Do not degrease. Do not lubricate. * The Lohm is a measure of flow resistance. Additional information can be found at www. TheLeeCo. com. The Lee Company • 2 Pettipaug Road, PO Box 424, Westbrook, Connecticut 06498-0424 Tel: 860-399-6281 • Fax: 860-399-7037 • www.theleeco.com

LOHM 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...