Document ByonNxKe77QNDMMaZ7R9kz0OE

BACK PRESSURE VALVES... No. 13) illustrsted -- Klipfel Cup Due back pressure and relief valve cuts site required to half that of other types. Very Urge capacity with closer, cnaiter-free regulation. Closes tight with minimum blow down. For maximum inlet pressures 80 to 500 lbs. according to site. Other types avail able. GET BULLETIN 648. Coll Var Supply Houm or See CteeilRed Phone Ofrectorie* far Waerasf Kllpfft Agent. Ateboma llllnoti MtlMVlt Ohio llrmlngboia CMap St. louts Ctnctnaoit Asltwna Indiana toftttt City Clovotmd Noikvlllo Phoanla C-oat-llle Californio Iweflunnpcfll Son frondteo loultiono tiling* N* Tori on..-- ...... - CJ.uv.eii, to* Angola* Now Orisons Swffolo Colored* Msuschiutti Now York Rr^V. Portland Watkkngton Spokoao Osnvsf Florida fompo So>on MlcMgon Ooffoll Ponnoylvoftlo Sootilo Now Moabo PUlibvfgti Wluontln AlbvqvsiM PhllodoJpMa Mllwoukoo Ooerglo WmMU Norik Corolla* Tsaos Conotfo Allonto Dellot Montreal VALVES, I N C. HAMIITON, OHIO ONE CONTROL DOES T HE JOB OF TWO Morcoid OA-400 Sarias pfgttU/. Controls Incorporels a nngt hour don lubo which actuals* (wo |n(ja pendonlly adjustable Morcoid mao not oparstod mercury twitches *a Accomplish various circuit ooara. Ilona. For exemplo: OA-400 t. Cloae one alarm circuit at hlah preaeure and another at low preeeuro with both clrculit open over operating range. 2. As an eloctrlcal Interlock to open one circuit aa pressure risoa above and the second circuit aa the pressure drops below operating range, 3. To provide Iwe-stago control by opening or closing one drcult on a rise In pressure end the tocond circuit on a further rlso In preseure. Equipped with calibrated dial end outside adjustment--Ranges 0*30 psl to 300-8300 pel--The Morcoid Avallabta with magnet operated mercury swltchee Exotoskm-Proof or are not enacted by harmful offsets r Wtatitaforoot Housing ot duet, dirt, or corrosion--your easurence ol millions of operations. Write for Bulletin SP THE MERCOID CORPORATION :ago ... iiunois, u.s a. Play it Safe with NATIONAL SEAMLESS With pressures and temperatures con stantly increasing, plant engineers every where are putting their complete confi- ' t US'! " `~ and'Tubes. AAnd for gg<ood reason. life of a modern steam plant hinges on the dependability of its high pressure steam lines. And there is no more dependable power piping than NATIONAL Seamless --the famous "Walls Without Welds" that give you the extra margin of safety that only Seamless provides. U'S'S National Seamless has never been surpassed for power plant service, even under the severest operating condi tions. Pierced from solid billets of steel. National Seamless Pipe and Tubes have the strength, uniformity, and de pendability of solid forgings. Each length is an homogeneous steel cylinder with uniform wall strength throughout. National Seamless is.designed to re main structurally sound under high tem peratures and intense pressures. If you're planning the building of a new plant or repiping a present installation, remember to "play it safe" and specify National Seamless Pipe,and Tubes for longer, safer, more dependable, more economical service. Further Information ahaul Na tional Seamless Plpo sad Tube* for power plant* 1* offered In Uw following free booklet*: Bulletin Kumbar I* -- concern* Bulletin Number 1 o -- technical data on htfb-pressura power plaat piping. tl Wltliam Penn-Plica, PltU^ burgh SO, Fenneyivanla. MAflONAt TU8B OlVIltON, UNITID STATES STICl CORPORATION, PITTSBURGH, PA. (TiAfog SpddoftfoiJ wianm-sorm srcEi ermroir. m tuuiuo, ntmt mu etutitviou * nmo tutu nm emir (Cunn. r rott U S'S NATIONAL Seamless PIPE AND TUBES UNITED S ES S 304 POWER OECEM8EI W POWER OECEMBER 1953 307