Document Ra4nmVwaYq2Kp4M6bjg9jnq6E

Specialties Donnelly Systems Co. 9 Murray Street New York, N. Y. Temperature Control by Fractional Damper Regulators and Fractional Distribution Valves. Impulse Check Valves, Thermo-Differential Valves, and other Specialties for One and Two-Pipe Systems, Vacuum Return Line Systems, Gravity and Forced Hot Water Circulation Systems. The practical and theoretical experience of 37 years has developed the Donnelly Sys tems and the Donnelly Speci alties. orifice being such that a complete discharge of the air and water is at all times effected and a constant differ ence in pressure be tween the branch steam and return lines of one-half pound is always maintained. The general theory of design and con trol of the steam circulation in all Don nelly Systems is based upon the recog nized principle that in small systems there are, for short runs and for a limited number of automatic return valve de vices, no appreciable differences or losses in pressure. In other words, small sys tems have always proved simpler and more satisfactory in operation than larger- systems. Therefore all Donnelly gravity and vacuum return line plants are divided into groups of convenient and restricted size. The former are provided with a Thermo-Float Air Valve and the latter with a Thermo-Differential Valve for each group. The early recognition of this principle led to the design of the Impulse Check Valve, which is used at the return out lets of all radiators and coils in all Donnelly Systems, preventing any water or steam from entering the radiator from the return piping. It is an Automatic Needle Valve, the size of the orifice through the seat being properly proportioned to the pipe size and to the rated capacity of the valve. The normal operation of the valve is .the same in all systems, the weight over area of the - disc and the size of the The entire operative mechanism of the Im pulse Valve is enclosed in a heavy removable tube which is inserted in a standard valve body and the valves are guaranteed for five years. The Thermo-Differential Valve, 'used in Vacuum Return Line- Systems is conr structed as shown. It is made with a standard safety valve body and has a restricted seat which is proportioned to the capacity of the valve. The tfalve disc is provided with an impact surface,, as in the Impulse Valve, and with a cup-shaped portion for -holding the weights, together with- a central-. ro<J which acts as a guide for the vaporizing fluid thermostat. The opening in the bottom of the valve is. intended as a cleanout and should be provided with a nipple and cap. A small leakage open ing is provided in the seat so that the system will drain when shut down. A Thermo-Differential Valve is , in stalled in each branch return so that no water, air or steam can pass into the main return without being properly regu lated in pressure and flow. We will be glad to furnish catalogs or leaflets completely describing our speci alties and their applications. ._ 302 Specialties Excelso Specialty Works 119 Clinton Street Buffalo, N. Y. Excelso Indirect Water Heater, Fire Pot Generators, Rotary Hack Saw Tools The Excelso Water Heater consists of a heavy copper coil heating ! element fitted in a cast jiron shell by means "of patented ground joint connections. All parts are interchange able and easily acces sible. Connected on the outside of steam or vapor boilers the Ex- , celso elminates the fire I pot coil and insures a ! constant supply of 1 domestic hot water all during the heating season at an even temperature. The Excelso method generating do mestic water is so satisfactory and the expense so trifling that boiler manufac turers are providing special tappings in their boilers and heating engineers gen erally are recommending its use. The Excelso Heater can be p* easily connected below the water line of any steam or vapor heating boiler in any new or old installation. Also used fori heating water or other Shotas Excelso connected to round type of steam or vapor boiler. The storage tank may be located either liquids with live steam up to 25 pounds. in basement or any fioo* above. Typical Installation of Steam or Vapor | Boiler Dimensions--Price List--Capacities Size of Heater 11 12 13 14 15 Length, in. 10J4 14 11 Vi 15 19i4 Diameter, in. 5 5 614 6l/i 6}4 Shell openings 1" 1" 154" 154"' 154" Coil openings 54" 54" 1" 1" Weight, lbs. 17 23 31 39 46 List Price $30 $40 $50 $60 $70 Heating Water Below Water Line of Steam or Vapor Boilers Size of Heater 11 12 13 14 15 Tank Capacity 30 45 60 90 120 Temperature rise 100 degrees in 3 hrs. Heating Water With Live Steam Size of Heater 11 12 13 14 15 Tank Capacity 50 75 100 150 200 Temp, rise 100-3 hrs.-5 lbs. pres. Instructions for Ordering Heaters -Many tanks are installed too small and heaters should always be ordered to correspond with work required and not size of tank. Also make liberal allow ance if circulating system is used. Excelso Rotary Hack Saw Tool Boilers may be easily and quickly tapped by means of the Excelso Rotary Hack Saw Tool. Each-Tool cuts . holes for either 1", 1J4" or 154" pipe tap. Price, $7.50 net, includ Hack Saw Blade ing 6 blades, 2 of . each size. Excelso Fire Pot Generator Pot Generator fits any type hot water ` boiler or hot air fur nace and is so de signed as to be en tirely above fire. 1 Note that the shell' i of the Excelso is connected below sjp the water line and . that the boiling water from the steam or - vapor boiler flows down through the heater and heats the domestic water which circulates up through the coPPer coil. View Made in two sizes-' and in both cast iron and brass. Size No. 1: Up to 40 gal. capacity. Size No. 2. Over 40 gal. capacity. 303