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Healing Systems vaires. Air The Dole Valve Company Main office* and Factory: 1933 Carroll Avenue, Chicago 12, 111. THE ALL STAR LINE AIR AND VACUUM VALVES Selecting the right vent for a particular purpose is your assurance of the utmost efficiency and economy from one pipe steam heating systems. The Dole line covers every venting need and offers a complete choice for every purpose. Dole No. 1A Vari-Vent AirValve Modem gas, oil or stoker fired one pipe steam sys tems require QUICK vent ing. This radiator valve lets air escape twice as fast as ordinary valves and balances the flow of steam at the first "breath" of boiler pressure. Adjust able vari-vent feature gets air out of those "far away" radiators as quickly as those close to the boiler. Dole No. IB Vari-Vent Air Valve Balances the flow of steam to convectors, either cast iron or copper, of automatical ly fired systems. Dole No. 1C Quick Vent Float Valve Vents mains and speeds flow of steam to radiaators of automatically fired systems. Extra large venting port. Dole No. 3 Air Valve Vents radiators of . hand fired gravity steam heat ing systems. Double shell construction provides separate passages for air and condensation--extra large float defeats spitting or water leakage. Com plete venting assured at pressures up to 10 lbs. Dole No. 2B Vari-Vent Vacuum Valve Adjustable radiator valve for " vacuumizing" and balancing gravity steam heating systems. Patented Dole bellows vacuum seal locks out air after it'has been once | expelled from the sys tem. Easily adjusted vari-vent feature assists in equalizing steam flow to all radiators. Dole No. 5 Quick Vent Float Valve Vents steam mains on hand fired systems. Positive seal against water. Dole No. 4 Quick Vent Valve For quick venting mains that end 18 in. or more above, the boiler water line. Dole No. 103 Vacuum Valve For venting convectors, ceiling radiators and pipe coils of "vacuumized" gravity steam systems. Dole No. 6B Vacuum Valve Vents the mains of "vacuumized" one pipe steam systems. Pre vents the return of air. Closes against water. Dole No. 1933 Air Valve Low cost valve for venting radiators of hand fired systems. Large float pro vides a seal, against con densation to stop spitting. Dole No. 14 Key Valve Low cost venting device for con cealed radiators and convectors of hot water heating systems. Protects panel fronts from rusty water stain. Write The Dole Valve Company for complete catalog and handy selector chart which indicates the Dole Air or Vacuum Valve most suited for a particular need. 1082 Heating Systems Steam Systems Specialties C. A. Dunham Company Administrative and General Offices 450 E. Ohio Street, Chicago 11, 111. Factories: Marshalltown, Iowa; Michigan City, Ind.; Toronto. Canada; London, England - TORONTO 4,1523 Davenport Road. LONDON, Morden Road. S.W.19 THE DUNHAM DIFFERENTIAL HEATING SYSTEM The system is a simple two-pipe system in which all the essentials of circu lation, distribution and control are co-ordinated. Control of the temperature of the steam is accomplished by controlling the pressure or vacuum of the steam in the supply piping and radiators to balance exactly the heat input with building-heat-loss. VAPOR AND VACUUM HEATING SPECIALTIES 'Dunham Thermostatic Radiator Trap for Operating Pressures up to 15 Lb Gage Bronze body and cap. Thermostatic element phosphor bronze. Valve and valve seat cuprous alloys. Thermostatic elements interchangeable in covers without gages. Covers _ and disc assemblies interchangeable " L) i with standard traps. Size No. Size Conn. Inches Pat tern Cap.* Net Sq Ft Wgt EDR Lb Dimensions. Inches A BD IB 7C. VVii AP. AP. 200 iy 3>4 i% 236 400 2V4 334 334 3B y AP. 700 I't, 3% i'/. 334 Fig. SS56 Ratings are based upon lb conden sation per sq ft of equivalent direct radia tion per hour and a 1H lb pressure dif ferential. 740 SERIES DUNHAM RADIATOR VALVE (Spring Packed) Designed for low pressure steam heating service. Bodies are brass castings, rough finish. The valves are equipped with heavily constructed brass union nuts and nipples. All pipe threads and tappings are carefully machined and checked to standard gages. Non-rising stem, requires less than one turn of handle to open the valve fully. Dial shows direction and amount of opening. Heavy bronze spring keeps a constant pressure on a special graphited asbestos composition ring to maintain a tight seal around the valve stem. Fig. SSS4A Type Catalog Number Net Wgt Lb Dimensions. Inches Angle sw RH-LH A B C Type . Catalog Number Net Wgt Lb Dimensions. Inches Angle SW RH-LH A B C 740 SWI >/?A 741 SWI <AS 1% l'/4 740 SWIP/4A 2'/. i'/. 3'/, 741 SWIP/4S 3'/. 3'/t 3'/2 m 3% 742 SWI </2R 742 SWIP/4R 743 SWI VzL 743 SWIP/4L 740 SWI Vh 740 SWIPAA 741 SWI %S 1% m 742 SWI %R 2`34 1% 3'A 741 SWI PAS 4% 742 swiiWr 4y. 3% i'/. m 743 SWI %L 743 SWIlViL 740 SWI 1A 741 SWI IS 2</t 742 SWI IR 743 SWI 1L ft 740 SWI 2A 2% 336 126 3y8 j 741 8 742 SWI 2S SWI 2R 6'/, 7 743 SWI 2L Note: Dimensions for straightway and comer patterns upon request. 1083 4% 2V, 4'/.