Document QJpezXmnKrzgGvvn1zyN8Y1VE

For positive control, use this STRONG single-seated, pilot-controlled valve! Simple design, extra-heavy construction make STRONG'# Type **C" regulating valve give trouble* Tree regulation. Seml*ateel for pressures to 250 psi, 450 F.; cast steel to 600 psf, 7S0* F. With AnunvMclIf seat and disc, this valve automatically adjusts tlscH to control the flow of steam, air or gas required to maintain reduced pressure. Write us about your pressure reducing problem or request our complete steam specialties Catalog 68-X. TYPE Featurei Internal trolnsr, Anum* MelIt teat and dlu. Olrect *j>. erofed, ef ealra heavy iwnMtMl, Hilt valve li iwll. oble far privrti It t!5 pit, S00* F. TYPE "K" *Trada Mark Il*. U. 8. PU OS, STRONG, CARLISLE & HAMMOND COMPANY =; " wui >,d Cloveland I j, obis t Ahus.mi'i m Mart TECHNICAL BfDtfj _ " The author then discusses areas where changes or cIom will poy off. APC Paper, m, / Trends In Combustion end IftomTl perotwte Control, By P $ '* Bailey Meter Co. Since World War II the desul steam power plants has ednat*?? phenomenal pace in an effort ta kfl down the cost of power genembJS spite of increased eon of pUnt, supervision. The design chsages y have had aa important bearing oar lation of the steam generator s'rs i lows: 1. A substantial increase la cp with a corresponding Increase b end complexity of th fuel equipment 2. Increased steam temperature a corresponding need for closer persture regulation over a wider range. 3. Use of the reheat cycle which ut, a second temperature control ly likewise requiring close regulation o substantial load range. . 4. Adoption of centralized control one, two or more beUer-turblae wen^ which requires Improved control tod supervisory equipment and better do! sign of tbe supervisory statico, to imjs prove operator efficiency end miainih1 operating errors. The principal functions of s soluble eatomatie control system for regulating a modern high-capacity, hlgh-prtuorr and high-temperature steam generalor' are as follows: 1. To supply the comet amount o( fuel and air to the furnace to release heat in accordance with the load del mand. ' 2. To feed water to the boiler In it cordanca with steam demand. Thif-h, an important phase of regulation but. will not be covered In this pop*1 *1** we are dealing principally with iht release and control of the heat supplf3. To avoid any controllable I* due to excess air or Incomplete com bustion by proper iuel-alr prepaid**' ing. A related requirement It piovww against explosive atmospheres h furnace end maintaining proper fora**' pressures. .. 4. To distribute tbe heat releted the furnace to the evaporating sod1* superheating sections of the boiler l* * proper relationship to produce the^Jj quired quantity of steam at the deso*0 pressure and temperature. , 5. To arrange the instrumented? control equipment for most effieK POWER WMEMSf* l,U ] JfiUTOMATIC answer to felFIED TEMPERATURE fGULATION PROBLEMS... I.AMMSOH CONTROL (tam isnd? Ves! Thai is what happens at the hs-Coming Fibcrglfti plant ot Anderson, South yftlins. Here, temperature and humidity condj. {^ throughout the entire plant arc controlled jftjohnson. Kpie Orrier centrifugal refrigeration machine, Ckjcfa furnishes the chilled water for cooling in ^flection with the air conditioning, is under the jntrol of o Johnson T.1000 Single-Pen Wecord-O- 'j, fn addition to acting ss an accurate tempera* fffufre controller, this instrument also insures that a ffigntinuous'record of the temperature of the chilled 'ater is always available for reference. This is im portant, where industrial processes ore dependent upoo'the space conditions. In the forming and ^pishing rooms, apace temperatures are maintained imprecise levels by Johnson T-800 Master and JOT Submaster Thermostats which operate iphnson Valves and Damper Operators. ^Finishing rooms, offices, cafeteria, shops, brat udrcftm, kitchen and locker rooms are controlled v.iyJohnson Individual Room Thermostats. All of tho ^Johnson apparatus, engineered for the most exactj^'.tog results, is combined into a complete Planned* f^for-the-Purpose, lnstalled-for-thePurposc Control ''System. Another outstanding example of the adop tability of Johnson Control! -K-.Whether your plant calls for the solution of >,'^intricate temperature and humidity control prob'^nu or merely the simple application of a ainglo ^controller, call a Johnson engineer from a nearby `.'Branch Office and get the benefit ofover 60 years of ^experience offered by tbe only nationwide orgnni* $&*tioa.devied exclusively to manufacturing, planr uing and installing automatic temperature and air ^conditioning control systems. JOHNSON SERVICE > COMPANY, Milwaukee2,Wisconsin, Direct Branch i? Offices in Principal Cities. Oweru-Condng Rbergto* Corp., Anderton, .South Carolina. Lockwood* Oreana Engineer*, Inc, ordiltoet* o"d englnaar*. New York and Sportonburg, S. C.j Carrier Corporation1* Atlanta Office, clr conditioning controetor*. Temperature* In manidactuHeg and ether area* ore centrelted by 4ehe t*400 terirt Deem Therma*at(, mi ( which It Rhown above. hem centrel panel ol letl, o Jehncen T.SOO Tlntmcilct ceatrel* the daw* petm tempevolvre el eb leaving the eb wsther fer the dr cendMIeelee wall lervlng preccttlng ore*. Above, o Jobnton T-1000 ftecord-O-Slol ragulota* ond record* the tempererature of Ibe chilled woler leaving Iho Carrier centrifugal refrigeration machine. JOHNSON e&t/bnux/itc SetnjteteUttfcG ttftd APPLICATION INSTAUAftON SINCI ISSJ CONTROL SEPTEMBER 1953 i Ki i y i!i;