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C. A Dunham Co. Specialties, Healing 1 Trap No. i 2 Trap No. 8 No. 1. All Patterns Tapping Capacity 100 sq. ft. Rd*. No. 2. All Patterns Tapping )4"i Capacity 350 sq. ft. Rad. No. 3. All Patterns Tapping Capacity 800 sq. ft. Rad. No. 4. Angle and Straightway Tapping Capacity 1500 sq. ft. Rad. No. 5. Angle and Straightway Tapping 1Capacity 3000 sq. ft. Rad. 3 Trap No. 8 DUNHAM FLOAT AND THERMOJ STATIC TRAP 5 Trap No. 6 These traps handle large volumes of water and sudden calls for maximum duty. They open automatically for water and air and close for steam. They are suitable on either gravity or vacuum heating systems. The water is handled by the Boat operated valve which is so constructed that the opening is always sealed with water with no opportunity for steam leakage. The air is handled by the thermostatic valve. They combine the Dunham Thermostatic Principle with the float. They automatically open for air and water and close for steam. This trap adjusts itself slowly like a thermometer to the temperature con ditions present and permits a continuous flow, at a rate within its capacity limits, to keep the heaters free from air and water, without waste of steam. They may be applied to any type or make of cast iron or pipe coil blast heater. They are unsurpassed for dripping low-pressure steam mains and risers, vento heaters, unit heaters, blast coils, domestic hot water heaters, dry kilns, milk condensers, evaporators, paper machines and any industrial heater in which low-pressure steam (not exceeding 10 lbs. gauge)'is used as a heating medium. This type of. trap not only drains the heater of its water of condensation but automatically releases the air, thus obtaining as nearly 100 per cent heating efficiency as may be obtainable, which results in the operation of the equipment at its maximum potential output. In many industrial processes, it is desirable to operate on a vacuum, a condition that is fulty met in this type of trap. Typical connections using Thermostatic and Float Trap on a Verito Healer Size Pipe Connection. Capacity. In. Direct Raaiation. Sq. Ft. No. 22 No. 23 No. 16 No. 17 No. 18 No. 19 No. 20 V* l V* .1 114 l'/2 2 3,000 4,000 ' 6,000 7,000 9,000 11,000 16,000 448 C. A. Dunham Co. Specialties, Heating Dunham Pressure Reducing Valve Made only in standard weight for a pres sure range of 125 lb. down on high side, to 10 lb. and atmosphere. on low side, in straight and expanded outlet patterns. Dunham Vacuum Pump Governor ' Used on steam driven vacuum pumps to control vacuum in vacuum return lines. Made in all sizes from H to 2 in., inclusive. Dunham Damper Control The Dunham Diaphragm Damper Regulator .controls the steam pressure in ounces. It operates check and draft damper with chains. Dunham Air Eliminator Used in connection with the Dunham Home Heating System for venting the air from the system. Two types. Capacities respectively 2000 and 6000 sq. ft. radiation. Dunham Oil Separator Made in all sizes from 1)4 to 6 in. Flanged connections. Dunham Strainer Has a large brass screen basket for "catching and holding the dirt; easily ac cessible for cleaning and at once commends itself for this purpose. Made in all sizes from ^ to 6 in. Dunham Air Line Valve The principle of operation is identical, and design similar, to the Dunham Radi ator Trap. Its efficiency is high, and ser vice in connection with air line systems invaluable. Can be furnished with either )4 or M-in. radiator connection. Air piping is required in connection with its use. . It must not be subjected to steam pressures exceeding 10 lb. gage. able in making old one-pipe heating .sys tems more efficient. It is. easily and eco nomically installed, and insures the quick removal of air from the radiators. The Dunham Home Heating System This is specially for the home or small building. It uses steam at very low, pres sure. Steam is admitted into the radiator by the Dunham Packless Radiator Valve, where it is retained by the Dunham Radi ator Trap until it has given off its heat, when, as water, it passes through the trap together with the air, and back to the boiler through the return piping. The air is released by the Dunham Air Eliminator, and the water returns naturally to the boiler. The design is such that a partial vacuum can be obtained on receding fire, with water continuing boiling. Hot water pattern radiators with top inlet connec tions are required. The end of each steam main is vented through a Dunham Trap into the return piping, and is dripped through wet or dry drip pipe directly back to the boiler return header. The Dunham Return System This System differs from the Home Heating System in that it makes use of the Dunham Return Trap in place of -the Dunham Air Eliminator, which introduces the added feature of a positive automatic return of water to the boiler when it is desired.to raise the steam pressure. The feature of a positive return under varying steam pressures makes this Dun ham System particularly adaptable to apartment houses, small hotels and me dium size commercial buildings, schoolsand churches. This System makes possible the modernizing of old one-pipe and two-pipe gravity systems, and eliminates the sput tering, leaking air valves which are such trouble makers in these old heating jobs. Dunham Air Line System This is a one-pipe steam system using a Dunham. Air Line Valve on each radi ator, with a system of air line piping which may discharge the air by gravity, or be attached to an air line Vacuum Pump. This system is particularly adapt The Dunham Vacuum System Simplicity is the key note of Dunham design. There is the system of steam mains and piping to supply all radiation,, and the return piping to carry away the air and water of condensation by means of a vacuum pump. Steam may be sup- lied direct from boiler, or through a Dun am Reducing Valve, where boiler pres sure is too high for direct service. Or ex haust steam may be-used, supplemented by live steam through a Reducing Valve. Bulletins Bulletins of standard architectural size with detailed information covering each System, and all products, including roughing-in dimensions, will be furnished on request. 449