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Heating Systems Specialities Yarnall-Waring Company Manufacturers of Steam Specialties 133 Mermaid Ave., Philadelphia 18, Pa. YARWAY IMPUL! Construction--Made entirely of bar stock. Only one moving part, valve (F). For pressures to 400 lb, body and bonnet of cold rolled steel, cadmium plated; cap of tobin bronze, valve and seat of heat treated stainless steel. For 600 lb, trap is all stainless steel. Operation--At low condensate tempera tures, bypass through control chamber (K) and center orifice of valve reduces chamber pressure and valve opens. At high temperature, condensate-vaporizes in (K), increased volume builds up pres sure and valve closes. Light Weight--Need no support--f in. trap weighs only If lb. 2 in. trap weighs 8f lb. Small Size--| in. trap 2f in. long--2 in. trap, 4f in. long. Will not air bind.--Require no priming. Insure quick heating. Low Price--Often cheaper than repairing old traps. Factory set for all pressures to 400 lb (or 600 lb) without change of valve or seat. ' Send for descriptive bulletin T-1740. YARWAY FINE-SI STEAM TRAPS List Prices, Weights and Dimensions No. 60 Series--to 400 lb; 120 Series--to 600 lb Size Trap Weight Length Complete Pounds Inches H" Nos. 6U or 12<* K" Nos. 61 or 121 r Nos. 63 or 123 \VA' Noa. 64 or 124 IH" Nos. 66 or 126 V Nos. 67 or 127 $15.00 22.00 31.00 48.00 68.00 90.00 \'A 2 2H 4 m 8X 2H 3 SH 3K 4X *x STRAINERS Yarway Fine-Screen Strainers offer l>etter protection against rust, scale and dirt for all steam equipment. Made in ten standard sizes from K in. to 3 in. Cadmium plated bodies. High grade Monel wovcn-wire screens. Many thousands in use. Write for Bulletin S-202. EXPANSION JOINTS All-steel welded construction; light but strong. Chromium covered sliding sleeves. Cylinder guide and stuffing box integral, assuring perfect alignment. In ternal limit stops. Gun-pakt and Glandpakt types: Gun-pakt (illustrated) fitted with screw guns which permit addition 1376 of plastic packing while joint is under pressure. Sizes 2 in. to 24 in., single end or double end, flanged or weld ing ends; 150, 300 and 400 lb pres sures. Choice of leading utilities and industrial firms. Send for Bulletin EJ-1912. Heating Systems Valves, Air The Dole Valve Company Main Offices and Factory: 1933 CaiTOll Avenue, Chicago 12, 111. WATER MIXERS CPV /? THE ALL STAR LINE j THERMOSTATIC AIR CONTROL AIR AND VACUUM ' ----- VALVES "DOLE THERMOSTATIC AIR CONTROL" FOR FORCED WARM AIR HEATING SYSTEMS PROVIDES INDIVIDUAL ROOM TEMPERATURE CONTROL Operates thermostatically from room air temperature. Extremely Sensitive: Modulates output to meet heat requirements. Completely self-contained; no wires to run--no bulbs to locate--simple to install. Replaces standard forced warm air registers. Simple setting of the thermo-dial assures room temperature as desired--corrects many unsatistory heating installations. Materially improves any forced warm air system. An automatic balancer. A fully automatic zone control for every room. Dole Air Controls are available in two sizes and will fit the following stackhead openings: 10" will fit- 10* x 4* 10* x 5* 10* x 6* 12* will fit-- 12* x 4* 12* x 5* 12* x 6* With an adapter 12* will fit-- 14" x 4* 14* x 5" 14* x 6* An adapter is available for baseboard installation of these Controls. DOLE AIR AND VACUUM VALVES The Dole line covers every venting need on one pipe steam and hot water heating systems and offers a complete choice for every purpose. DOLE WATER MIXERS Dole Water Mixers provide safer, tempered domestic hot water on all tankless heater and storage tank installations. Available in 3 sizes, H in* % in*, and 1 in. 1377 ! ;i .(