Model 108-3 (Fueling Service) Model 108-3 Back Pressure / Check Valve Global performance. Personal touch. TOLL FREE 1.888.628.8258 phone: (918)627.1942 fax: (918)622.8916 7400 East 42nd Place, Tulsa, OK 74145 email: [email protected] website: www.controlvalves.com SERIES FEATURES Pressure Sustaining: Prevents inlet pressure from dropping below a predetermined minimum Automatic closure on pressure reversal Operates over a wide flow range Set pressure is adjustable with single screw Quick opening and adjustable closing speed Can be maintained without removal from the line Factory tested and can be pre-set to your requirements Model 108-3 SCHEMATIC OPERATION The normally closed, spring-loaded pilot, sensing upstream pressure, responds to changes in pressure and causes the main valve to do the same. The net result is a constant modulating action of the pilot and main valve to hold the upstream pressure constant. The pilot system is equipped with a closing speed control that fines tunes the valve response to the system variables. If downstream pressure becomes greater than upstream pressure, the valve will close to prevent reverse flow. COMPONENTS The Model 108-3 consists of the following components, arranged as shown on the schematic diagram: 1.) Model 65 Basic Valve 2.) Model 1330 Pressure Relief Pilot 3.) Model 126 Ejector 4.) Model 141-3 Flow Control Valve ( closing speed control) 5.) Model 141-1 Check Valve 6.) Model 123 Inline Strainer 7.) Model 155L Visual Indicator ( optional) SIZING Pressure sustaining valves should be limited to a maximum velocity of 25 ft/sec. Definitive sizing information can be found in the OCV Catalog, Series 108 section and Engineering section Performance Charts. Consult factory for assistance or visit our site, www.controlvalves.com, for our fueling spec program, ValveMaster Fuels. RECOMMENDED INSTALLATION Install the valve with adequate space above and around the valve to facilitate servicing. Refer to the Dimension Table. Valve should be installed with the bonnet (cover) at the top, particularly 8" and larger valves, and any valve with a limit switch. Shut-off valves should be installed upstream and downstream of the control valve. These are used to isolate the valve during start-up and maintenance. REVISED 1/12/11 SIZE 1 1/4", 1 1/2" 2" 2 1/2" 3" 4" 6" 8" 10" 12" 14" 16" 24" FLOW@25FT/SEC GPM 115-160 260 375 575 1000 2250 3900 6125 8750 10600 13750 31250 MAX. PRESSURE END CONNECTIONS DUCTILE IRON STEEL/STN STL ALUMINUM Threaded 640 psi 640 psi 285 psi Grooved 300 psi 300 psi 200 psi 150# Flanged 250 psi 285 psi 285 psi 300# Flanged 640 psi 740 psi --- The Model 108-3 has a wide range of applications: anywhere a system must be protected from pressures that are too high (relief) or too low (sustaining) and reverse flow must be prevented. Typical examples include: Pump systems Fuel distribution systems
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