Document ZnqBZy1Z8zXBDbewX6v20Mn3L

Controls and Instruments Spence Engineering Company, Inc. 28 Grant Street, Walden, N. Y. 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 1wiredrawing. 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 fhe SPENCE Safety Pilot is connected to the low side. Should the secondary valve fail, this Pilot will assume control ofthe primary; thereby effecting a one-stage reduction from primary to final delivery pressure. -- By adding a SPENCE Solenoid Pilot any SPENCE Regulator may be cut on and off electrically. A Spence Type E2T100 Temperature Regulator re duces and modulates the steam pressure to a heater with great sensitivity. Very small changes in temperature at the thermostat produce sufficient variation in pressure to rapidly adjust the rate of heat transfer as needed. This Temperature Regu lator is actually a Pressure Regulator which is being re set in a positive, step action by small variations in tem perature at the sensitive thermostat. It is unaf fected by varying initial pressure and guaranteed to shut off tight when the de mand has ceased. 1268 Specify SPENCE Type E2T100 for accurate and highly efficient control on all types of heaters. Controls and Instruments Sterling, Inc. 3738 North Holton Street Milwaukee 12, Wisconsin vFJl Heating and Temperature Control Products Distributed through leading Heating and Plumbing Wholesalers Sales Representatives in Principal Cities HEATING SPECIALTIES Thermostatic Traps: sizes 34 in., 24 in-> Tin.; max. pressure 15, 65, 100, 125 psi; Angle, Straightway, Corner, Vertical Body Styles. Float and Thermostatic Traps: sizes 24 in. to 2 in.; max. pressures 15, 100 psi. Strainers: max. pressure 125 psi; Cast Iron Sizes 24 in. to 2 in.; Brass Sizes % in. to 1 in. Also Vents, Radiator Valves, Boiler Return Traps. Illustrated at right is the compact, sturdy 24 in. 69B F & T Trap, which like all other Sterlco traps has a bellows type thermostat and replaceable seats and valve members. CONDENSATION and VACUUM PUMPS 4100 and 4200Series (illustrated): neat, convenient unit with either steel or cast iron tank. Dual voltage ca pacitor type motor and carbon type rotary seal--for all jobs up to 14,000 sq ft EDR, 20 psi. 3500 Series: heavy duty units with pedestal 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 under ground or in wet locations. 2000 to 20,000 sq ft, 20 or 30 psi. Vacuum Pumps: Type V, 2500 and 5000 sq ft, 20 psi. Type S, 10,000 to 40,000 sq ft, 20 to 40 psi. TEMPERATURE CONTROL VALVES No. 120 Thermotrol (illustrated): self-contained individ ual radiator temperature control for steam or hot water. Easily installed in place of manual radiator valve with out wiring or other external connections. Tank Tem perature Controls: self-powered modulating control valves for fluid heaters and process equipment. Sizes: 24 in., 34 in-, 24 in., 1 in., 134 in., 124 in * 2 in. 1269