PRECISION MICROHYDRAULICS PRODUCT HIGH PRESSURE 500 PILOT OPERATED CHEK® The Lee Company’s new High Pressure 500 Pilot Operated Chek is the latest addition to Lee’s line of miniature check valves. This valve acts like a normal check valve until pressure is applied to the pilot port, which then allows flow in the direction that would normally be blocked. This new valve is ideal for high pressure hydraulic applications with system pressures up to 5000 psi. The maximum restriction when piloted open is only 60 Lohms. The High Pressure 500 Pilot Operated Chek is available in forward and reverse free flow configurations, and the metal components are constructed entirely of stainless steel for durability and long life. Nominal weight is just 49 grams. Each Chek is 100% tested and inspected to ensure reliable, consistent performance. Designed for System Pressures up to 5000 psi 60 Lohms maximum when Piloted Open Weighs Only 49 grams 100% Tested and Inspected Endurance Tested to 500,000 Cycles 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 PDS 144 5/17

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...