: We are helping our friend find definitions needed for : school and are having problems.: Please help…..: 1 Recirculation main : 2 Recirculation valve : 3 Recirculation pump : 4 Direct siphonage : 5 Vent stack : 6 Stack vent: any assistance would be greatly appreciated.Here is some useful information I have found while surfing the net.Atlantic Group, Inc. P.O. Box 218630 Houston, Texas 77218-8630 Phone: (281) 578-0366 / Fax: (281) 578-0368 Booth #: 520mailto:[email protected] Recirculation Valves protect centrifugal pumps from damage that may occur during low-flow operations. When the system demand drops below a predetermined flow rate, the modulating bypass in the Automatic Recirculation Valve opens and maintains the pump minimum flow rate. This rate is maintained even if the flow through the main valve is completely shut off. Applications include boiler feed and cooling water plants, Petrochemical and Cyrogenic applications, Potable Water Supply, Water Injection, Shipping, Booster Pumps, and many other procession applications. Special features include simplistic design, direct-acting modulating bypass, and compact self-contained design.Sizes range from 1 inch to 24 inches, including ANSI Class 150 thru 2500 lb.http://turbolab.tamu.edu/pcorppg/pc1187.html
