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422 Heating System' < JENKINS BROS. 100 Park Avenue, New York 17, N. Y. Bridgeport, Conn.; Boston, Philadelphia, Chicago, San Francisco, Atlanta DO YOU HAVE THIS HELPER? FOUR TYPES OF INDEXES LEAD QUICKLY TO DATA NEEDEO Four-way indexing--General, Alphabetical, Fig. No., and Sec tional--leads the reader instantly to the Information desired, from any point of reference ... pattern, metal, number, or function. VALVE SPECIFICATIONS UST ADVANTAGES AND MAJOR USES Every Jenkins Valve in every group,--Bronze, Iron, Cast Steel, and Stainless Steel--is fully ni trated and described in detail, with an explanation of its prin cipal advantages and uses. HELPFUL INSTRUCTIONS FOR CHOOSING AND USING VALVES Thirteen pages of basic informa tion,--"Fundamentals of Valve Design and Application"--serve as a guide in selecting the correct type of valve, and provide instruc tions for their proper installation and maintenance to assure maxi mum service life. For clear, complete, easy-lo-find data on valves and bow to select and use them, reach for this latest Jenkins Catalog. USEFUL TABLES AND REFERENCE OATA TO HTN FAVOR Of ENGINEERS In the 23 pages of the "Engineer ing Data" section, Catalog No. 56 provides a compilation of useful required tables, charts, and codes --the information wanted by the men who plan piping layouts .. andspecify valves. From cover to cover this 296 page general catalog of Jenkins Valves was designed to give specifiers and buyers all the data they want.. . and FAST. It's the book to reach for FIRST when you need valves or valve information. Write for your copy. Beating Systems - sp Ysircs 423 JAS. P. MARSH CORPORATION Marsh Instrument and Valve Co. (Canada) Ltd., 8407 103rd St., Edmonton, Alberta. Dept. .5, Skokie, Illinois r Branches in Principal Cities Houston Branch Plant: 1121 Rothweli St., Sect. 15, Houston, Texas. Marsh products include: Pressure, Vacuum and Compound Gages; Dial Thermom eters; Steam Traps; Vents; Packiess Radiator Valves and Radiator Traps; Refrig eration Water Regulators; Refrigeration Testing Instruments; Solenoid Valves; Needle Throttling Valves. Radiator Traps--Equipped with the famous Marsh phosphor bronze diaphragm charged with volatile fluid. Extremely rugged, but so sensitive it closes tight on steam and opens instantly to pas3 condensate and air at only a few degrees below closing temperature. Highly efficient on pressures from below atmos pheric up to 25 psi. Other traps available for pressures up to 125 psi. Pressure Ganges and Dial Thermometers--The respected Marsh line covers every requirement for pressure, compound, altitude gauges, ther-altimeters and dial thermometers. Marsh instruments are the product of nearly a century of experience. Sizes, ranges and case styles for all needs. Marsh Radiator Trap and Packless Valve. Both are available in full range of patterns. Packiess Radiator Valves--rNot just packles.jn name; the ingenious Marsh annular mechanical seal does away with packing of any kind. Valves close on less than one turn. For either steam or hot water. Maximum water pressure, 125 psi. Float and Thermostatic Traps--De signed for complete removal of air and condensate from steam mains, branches and risers. Condensate discharged through float operated valve at bottom; air through vent in top. Wide range of pres* sure and capacity ratings. One., of the many float and thermostatic traps is illus trated. Line also includes float traps. Marsh Float and Thermostatic Trap. Refrigeration Valves--Recent addition to the Marsh tine of water regulating valves is the Type 56 pressure actuated regulator illustrated. It is adjustable for both Refrigerant 12 and 22--adjustable from 60 to 270 psi--by simply twisting handy knurled cap on bottom. Although small and compact for installation in tight quarters, it has ample capacity for wide range of applications. Other Marsh Water Regulators, both temperature and pressure actuated, for practically every cooling or heating application. Marsh Type 56 Regulator, made in sizes of % in., K in., H in* and 1 in. Other types available. Inverted Bucket Traps--Marsh quality and performance in a trap for applica tions where the inverted bucket type is indicated. .. Marsh Inverted Bucket Trap. Air Vents--Automatically remove air and gases from tanks, coils or piping, liquid pump systems, and other similar applications. Float holds valve tightly closed when system is filled. Opens only when air aceummulates. Has vacuum check which prevents return of air. Type illustrated is for working pressures up to 125 psi. Other types, including float and thermostatic types,for low pressure. Solenoid Valves--Bodies made from solid bar stock. Packiess, smooth-operat ing, tight seating valves with coils that withstand frost and moisture. Ask for catalog The comprehensive Marsh line is merely high-lighted here. Ask for catalog infor mation covering your specific needs. Marsh Solenoid Stop Valve. Di rect acting and pilot operated valves which cover a broad range of require ments.