MINI REGULATOR, MINI REGULATOR DRAIN CHECK & MINI DRAIN CHECK MDC or MRDC Gray Outlet Brown Outlet Green Outlet Portable irrigation systems to eliminate crop wash out from partially pressurized sprinklers during system start up and shut down. For systems in which pressure ranges are excessive, the Nelson Mini Regulator provides uniform flow and distribution at each sprinkler through pressure regulation. Choose from 20, 30, 35, 40, 45, or 50 PSI (1.4, 2.1, 2.4, 2.8, 3.1 or 3.4 BAR) nominal pressures. Mini Regulator Drain Check (MRDC) To eliminate sprinkler drizzle during shut down and start up and for pressure regulation use the Nelson Mini Regulator Drain Check. Choose from 20, 30, 35, 40, 45, or 50 PSI (1.4, 2.1, 2.4, 2.8, 3.1 or 3.4 BAR) nominal pressures. Mini Drain Check (MDC) The MDC is a check valve only that opens 2-5 PSI (.14-.35 BAR) below the nominal pressure rating. Available in 20 and 35 PSI (1.4-2.4 BAR) options. Ideal when a check feature only is needed or when it is necessary to operate sprinklers at different pressures that best suit environmental conditions. Overhead cooling of apples and other crops to prevent drainage of the system in between frequent on / off cycles of the irrigation system. With adequate pressure, the MR and MRDC regulate to design pressure but the MDC is open fully and does not regulate. (flow not regulated) (flow not regulated) (flow not regulated) Greenhouse irrigation systems where sprinkler dripping or drainage after shut down cannot be tolerated. With low pressure, the MR is open, the MRDC and MDC are closed to draining. With no pressure, the MR is open, the MRDC and MDC are closed to draining. Systems where pressure gains or losses are high due to uneven topography or high friction loss in pipes to ensure high uniformity and even flow of all sprinklers in a system. Nelson Irrigation Corp. 848 Airport Rd. Walla Walla, WA 99362-2271 USA Tel: 509.525.7660 Fax: 509.525.7907 E-mail: [email protected] Web site: www.nelsonirrigation.com

CONNECTION OPTIONS OUTLET PRESSURE PSI MRDC PERFORMANCE GRAPH 1/2" MNPT X MALE ACME THD 1/2” FNPT inlet 1/2" FNPT X MALE ACME THD 1/2" MNPT X MALE ACME THD Acme outlet 1/2" FNPT X MALE ACME THD Pressure Options Shown: 30, 40, 50 PSI (20, 35 and 45 PSI options also available.) Recommended Flow Range: 0.15 GPM to 5 GPM Maximum Inlet Pressure: 150 PSI MinimumX 1/2" MNPT THDPressure: 5 PSI above regulator pressure Inlet 1/2" ACME HOLD BACK ELEVATION 35 ft. 44 ft. 67 ft. HOW IT WORKS: The MRDC is a normally closed device. The check will not open until a 1/2" MNPT minimum inlet 1/2" FNPT X 1/2" MNPT...