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C. A. Dunham Company Heating Systems fj"^ties DUNHAM HEATING SPECIALTIES Radiator Traps For all types of low pressure steam heat ing systems up to 15 lb gage. Dunham design assures freedom from clogging; thorough draining of radiators by grav ity; minimum wear on parts. Body and cover of cast bronze; disc of Monel metal. Round, slightly raised valve seat minimizes depositing of incrustrants. Size 1E 2E 3C Pattern AP SW RH LH VS AP SW AP Tapping K' 1' Cap. Sq Ft EDR 200 400 700 Thermostatic Steam Traps Operate in response to pressure caused by partial vaporization of liquid within thermostatic disc. Permanent adjustment for correct operation built into trap at factory. Body, cover, union nut and nipple are brass. Valve and seat are special heat-treated stainless steel. Spherical valve is swiv eled to insure tight seating without causing localized stresses on disc. Ex ceptionally large valve opening permits ready passage of water or dirt. For 5 to 100 pounds working pressure-- Made in in., | in. and 1 in. sizes, for capacities from 125 to 1780 lb Cond./hr. * Ratings are based on K lb condensation per sq ft of EDR per hour and a \x/i lb pressure differential. Radiator Trap, No. IB, tE, SC Thermostatic Steam Trap, Type THIA Float and Thermostatic Traps Especially adaptable for service as a drip-trap for drip ping ends of steam mains, unit heaters and all types of heat exchangers. Capable of handling large amounts of air and water. Float is made of copper. Float valve and seat are Monel metal. Body can be removed for inspec tion of working parts without disturbing piping con nections. Operating pressures up to 15 psi gage. Sizes: X in., 1 in., IX in., IX in., and 2 in.; respective capaci ties: 800, 2000, 4800, 9600 and 20,000 EDR at X lb condensate per sq ft per hr. with 2 lb pressure differ ential. Series 31 closed float traps available in same capacities. Float and Thermostatic Trap, Series SO Inverted Bucket Traps Inverted Bucket Trap, Types OB, OBS For venting air and draining water from high pressure steam lines, heat exchangers, sterilizers and processing equipment. Traps increase heat transmission efficiency and hold equipment capacity to a maximum. Body and cover of high tensile iron castings. Valve and seat (renewable and interchangeable) are special hardened, corrosion-resistant steel. Sheet copper bucket. Capacities range from 400 lb to 5600 lb of condensate per hour. Operating Pressures: 20 to 150 lb gage. Sizes: Type OBS X anc* % in. Type OB X 4o IX in. inclusive. 1384 C. A. Dunham Company Heating Systems lS^l,,es DUNHAM HEATING SPECIALTIES Valves "Oriflex" Valves Self-contained, adjustable orifice valves, packless bellows-type for proportioning steam supply to each radi ator. Valve need not be disconnected to make adjustments. Merely remove handle, insert key on adjustment stem and turn orifice to desired setting. Sizes: and 1 in. "Oriflex" Valve, Type 175 Packless Valve, TypetVfi Packless Valves For all types of low pressure steam heating systems. Body and bonnet are brass castings. Heavily contructed brass union nuts and nipples. Phosphor-bronze bellows sealing member gives maximum resilience and wear; prevents leakage; Keeps steam, water and dirt from clog ging and corroding spindle nut and screw. Non-rising stem. Heat resistant composition handle. Sizes: to 11 in. inclusive. Spring Packed Valves For low pressure steam heating services. Body is brass casting, rough finish. Heavily constructed br$ss union nuts and nipples. Non-rising stem. Valve opens fully on less than one turn--dial shows direction and amount of opening. Heavy spring keeps constant pressure on special graphite asbestos composition packing to maintain tight seal around valve stem. Sizes: 1 to 2 in. inclusive. DUNHAM PUMPS Spring Packed Radiator Valves, Type 740 Vacuum Pumps Furnished as single (Type VR) or duplex (Type VRD) units. Separate accumulator tank avail- id able for handling low returns. Each pump has own control panel wired through to motor. Pumps efficiently maintain desired vacuum range on return lines and deliver condensate direct ![to low pressure^ boiler. Selector switch on panel permits pump to Type VR, Model B Pump, for capacities operate on fully automatic, con- /rom *5.000 to 65,000 EDR. tinuous, or float control. Type VR, Model C Pump, far capacities up to tO,000 EDR. Condensation Pumps Complete, compact assemblies for automatically returning conden sate to boilers for gravity heating systems or steam process equip ment. Also manufactured as Boiler Feed Pump. Type CHV--Single and Duplex-- 3450 rpm for pressures up to 20 lb. Capacities 2,000 to 10,000 EDR. Single Condensation Single Condensation Pump, Type CH (CHH) Low priced pump. Type CH--Model D, Single and Pump, Type CHV Duplex--1750 rpm for pressures 50 lb and lower. Capacities 2,000 to 50,000 EDR. Rugged pump for heavy duty applica- tions. Type CHH--Model D, Single and Duplex--3450 rpm for higher pressures up to 70 lb. Capacities 2,000 to 50,000 EDR. Rugged pump for heavy duty applications. 1385