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A VALVE THAT WILL INTEREST EVERY POWER ENGINEER I':' i;-. 1. ' The DAVIS No. 265 HIGH PRESSURE RELIEF VALVE iit1 t. v.fri ;X *. ' ! ') I' y`1 . USES.'-'O) For turbine relief on bleeder sys tem. (2) For protection of ony boiler room or process equipment by relief to atmosphere. (3) For relief of high pressure lines to low pres sure lines ot predetermined pressure. (4) For use in plants corrying multiple boiler pressures to protect lower pressure systems. ADVANTAGES. -^Multiple springs result in less spring accumulation . . . less build-up for maximum relief . . . less blowdown to close. Compact design with springs at sides reduces headroom requirements. Center adjusting screw available for quick, easy change of pres sure setting. BUILT TO MEET YOUR REQUIREMENTS. Offered in sixes from 4" to 3ff' in semi-steel or steel with bronze or stainless steel trim. Test lever and hold-open device available when desired. Dctoiled in formation on request. DAVIS REGULATOR CO. Boprunlstlm to' AH Principal Cilia* 2540 S. WASHTENAW AVE., CHICAGO 8. ILL 116 (SSb) tested *t 310 psi. about 50% above A It maximum net head, iC1#p * FundawntoU at Hydraulic Opororoni, oy G Forrest Drake, IF^J ward Governor Co. The problem 4 speed control ol prime movers it cm sidered briefly. Various speed-eon^ devices and servomechanisms are 4 scribed, end the choice ol ceniri(uf|| ball-head and hydraulic servoi cussed. Included are typical corabh* lions of these elements plus necesto) stabilizing devices. Application el 4. draulic governors to various prime roe era it described as are some unusual % siallaltons, such as aircrafl-proptlfe and wind-turbino control. NCIIl pep^ Hydraulic Circuits of Industrial Prana Contrail, by H Ziebolt, Askania R(p lator Co. Calls attention to the iarity between the problems ol tool tad process hydraulic controls. Analyte are given ol basic amplifiers, transits^ stability, basic design features, icrni translators for different variables, t> mote controls, program controls, fate locks and safety features. NCIH papa Fundamental Aspects of Cavltotha by Hunter /louse, Iowa Institute of Rf draulic Research. State University 4 lewa. Cavitation--the tendency al flowing liquid to vaporize in cooes d low pressure--is discussed as a bid phenomenon of fluid mechanics. ,Tb relationship of cavitation research b various fields--fluid machinery, supe aonica, underwater ballistics, and by draulic structures--la described, to phasize both the general nature of Ai problem and the advantage of cooper ative endeavor. NCIH paper. Cavifotien la Centrifuge) Pumps, R M Watson, Worthington Pump i Mach Corp. Cavitation in centrifap pumps has long been a matter ol cet cem to manufacturers and users of tod equipment Erosion of pump element* noisy and unstable performance hi* been studied to determine: (1) limhhl conditions of operation for which can ful design ean produce o pump frees cavitation (2) nature of cavitation is ol materials best suited to wUhstt its destructive effects. Particular attention Is given to A* many factors that cause what might k called premature cavitation, such ** local surface defects due to casting dr partures from ideal shapes, entrap conditions causing a flow pattern sf anticipated, leakage jet past we*d*| rings from discharge to suction, nonuniform flow in the impeller caotk * P-O1 W- ER January if* How to CHOOSE a STEAM TRAP This 40 page book tells how to select the right size of trap for: unit heaters, header drips, coils submerged or in still air, mains, autoclaves, water heaters, special equipment and many others. Tells how to determine lift of a trap: what are best trapping prac tices and accepted theories; gives operational and maintenance facts and tips. Part of the HOW TO SAVE SCARCE FITTINGS use Super~Silvertops and save 7 fittings per trap You can save as many as seven pipe fittings per trap by using Anderson Super-Siivcrtops. These dependable time-tested, inverted bucket steam traps conserve hard-to-get fittings and save up to <50 minutes of installation time on every trap. Guided bucket design with all connections made at the head of the trap arc responsible for these savings--savings obtained without the use of cored passages and split (pierced) gaskets. Send for your copy of the book "How To Choose A Steam Trap" --it's helpful, valuable, shows the way to savings and docs not obligate you in aoy way. THE V. D. ANDERSON COMPANY 1934 Weal 96lh Street Cleveland 2, Ohio 8raaosaaTOai)P / ^ Q'jJBAra tramps *OW|R January 1940 tit