100 Series
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CIRCLE SEAL CONTROLS, INC. Features & Benefits Low pressure • Lightweight check valve for pressures to 25 psig. Ultra-sensitive • Unique design allows flow with minimum pressure differential. Cracking pressure is 4" H2O maximum. Positive sealing • Unique knife-edge on the poppet positions snugly to provide zero sealing even with extremely low pressure. Zero leakage • Compact, easy installation. Efficient, inline design reduces size and weight. The valve can be mounted in any position. Note: Proper filtration is recommended to prevent damage to sealing surfaces. How it Works Open Full flow passages offer minimum restriction to flow. Spring is completely removed from flow path Closed As the inlet supply pressure decreases, a light spring closes the poppet, positioning the knife-edge automatically in line of contact sealing against the o-ring. The impression of the knife edge is limited by a metal-to-metal seat, which carries the reverse pressure load and serves to prevent sticking of the o-ring. Circle Seal Controls 2301 Wardlow Circle • Corona, CA 92880 Phone (951) 270-6200 • Fax (951) 270-6201 www.circle-seal.com

Pipe, Female Size A Dia. B Hex C Flow Curve O-RING MATERIAL &- TEMPERATURE RANGE 19 Buna N, -40° F to +250° F 32 Viton®, -20° F to +400° F MATERIAL A Aluminum B Brass T 303 stainless steel1 T1 316 stainless steel CONNECTIONS—INLET/OUTLET P Female pipe, NPT VALVE SIZE 1 '/s' 2 A" 3 3/s" 4 A" 6 %" t Not available for PED applications. Please consult Circle Seal Controls or your local distributor for information on special connections, o-rings, operating pressures, reseal pressures and temperature ranges. Repair Kits In normal service, the only part(s) which may require replacement...