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Controls and Instruments Spence Engineering Company, Inc. 28 Grant Street, Walden, N. Y. Regulators for the accurate control of Pressure, Temperature, Differential, Back Pressure and Liquid Level; also Pump Gov ernors, Electrically Controlled Regulators, Desuperheaters and Strainers. The SPENCE Type ED-W27 TwoStage Pressure Reducing Station is de signed to serve a heating system depend ably, at low cost and with utmost safety. The primary is a pilot operated. Type ED Pressure Regulator. SECO Metal trim affords guaranteed resistance to wiredrawing. The secondary is a direct operated, Type W27 Valve, simply con structed, yet engineered for long trouble- free, heating duty. Note that the Diaphragm of the SPENCE Safety Pilot is connected to the low side. Should the secondary valve fail, this Pilot will assume control of the primary; thereby effecting a one-stage reduction from primary to final dehvery pressure. A Spence Type E2T100 Temperature Regulator reduces the steam pressure in addition to accurately modulating the hi flow as required to control the temperature. No separate reducing valve is necessary. By adding a SPENCE Solenoid Pilot any SPENCE Regula tor may be cut on and off electrically. 4- The Spence design provides a self-op erated, pilot controlled regulator en tirely packless in construction and guaranteed to shut tight. SECO Metal seats and discs will not be cut by the wire-drawing action of steam. Spence thermal elements are not injured by overheating Pilot Type T100 is weight-loaded for heaters requiring not more than iu P pressure. Pilot Type T150 is spnng-_ for pressures up to 50 psi. Either . be used on a storage or instantan _ heater in combination with a mam v selected to suit the initial steam c tions. 1486 Controls and Instruments Sterling, Inc. 3738 North Holton Street, Milwaukee 12, Wisconsin Heating and Temperature Control Products Distributed through leading Heating and Plumbing Wholesalers Sales Representatives in Principal Cities CONDENSATION and VACUUM PUMPS 4100 and 4200 Series (illustrated): neat, convenient unit with either steel or cast iron tank. Dual voltage capacitor type motor and carbon type rotary seal--for all jobs up to 15,000 sq ft EDR, 20 psi. 3500 Series: heavy duty units with pedes tal mounted steel tank for a wide range of jobs--2000 to 65,000 sq ft, up to 150 psi. 3700 Series: with heavy cast iron tank for installation underground or in wet locations. 2000 to 20,000 sq ft, 20 or 30 psi. Vacuum Pumps: Tvpe V, 2500 and 5000sq ft, 20 psi. Type S,`10,000 to 40,000 sq ft, 20 to 40 psi. Series 150-E TEMPERATURE CON TROL VALVES Self-powered, modulating control valves --applicable to any process involving heating and cooling by means of water, oil, steam or other fluids. Sturdy bellows --sealed valve with stainless steel trim and monel bellows. Armored capillary tube. Extremely compact--MOUNTS and OPERATES in ANY POSITION. Sizes: 3^ in., in., 1 in. Max. pressure: 125 psi. Direct or reverse acting. Series 117-A: Dependable action for larger capacities. Sensitive thermostat bellows operates a pilot valve--steam supply pressure is used for smooth posi tive operation. Sizes: in., 2 in. Max. pressure: 125 psi. Direct acting only. FLOAT and THERMOSTATIC TRAPS Used wherever it is desired to prevent now of steam, but to permit passage of sir and water ... on unit heaters, large radiators and convectors, water heaters, steam main drips and other types of equipment where steam is used. CornPact, rugged, easy to service. Bellows rnermostat vents air, float valve has Plenty of capacity for large amounts of ondensate. Sizes:in., 1 in., in., !} In-, 2 in. Max. pressures: 15, 100 psi. Also Strainers, Radiator Valves, Boiler Return Traps. THERMOTROLS Self-contained individual radiator tem perature controls for steam or hot water. Simple to install! Eliminate overheating, save fuel. Maintain even temperature for comfort and health. Sizes: Yi in., J4 in., 1 in. Body styles: Angle, Straightway, Comer. THERMOSTATIC TRAPS: Keep radi ators clear of condensate without wast ing steam. Dependable bellows thermo stat, sturdy bronze bodies and covers, replaceable seats. Sizes: Yi in., in., 1 in. Max. pressures: 15, 65, 100,125 psi. Body styles: Angle, Straightway, Corner, Ver tical. 1487