Document emRD65pkX2dBV8e1MGO6QVy4

Hoffman Specialty Co. Specialties NO. 7 HOFFMAN MODULATING VALVE To Specify By Name: Furnish and install on the supply end of each radiator, a No. 7 Hoffman Adjustable Modulating Valve, equipped with Jenkins Disk and Rotary Sleeve. To Specify By Description: Furnish and install on the supply end of each radiator a Y" rotary sleeve, graduated, leakless, valve, made of best steam metal, rough body, finished trimmings, nickel plated all over, and equipped with lever handle, Jenkins disk and union. Valve to be fitted with dials indicating port area and fractional control. Also furnished with Wood Wheel Handle, Lock Shield with Removable Key and Extension Stems and Handles. All Marks exposed 15 Marks exposed 10 Marks exposed 5 Marks exposed 200 sq. ft. 150 sq. ft. 100 sq. ft. 50 sq. ft. 310 Hoffman Specialty Co. Specialties No. 10 The No. 10 Hoff man Vapor Valve positively distinguishes between air, steam and water, freely venting the air no matter whether this air is hot or cold but instantly closing against the pressue of steam. It also closes tight against water leak age when water comes against the valve but opens wide for the free passage of air at' pres sure less than one pound and opens its -ft" post the instant the water drops away from it at pressure of 5 pounds or less. It is automatic, non-adjustable and dependable in all the functions it is designed to meet. List Price, $25.00 The No. 11 Hoffman Vapor - Valve operates the same as the No. 10 Vapor Valve except that it is provided with a vacuum valve, as shown, which pre vents the return of air to .the system when once vented. List Price, $28.00 No. 11 The Hoffman Differential Loop is a safety device. Automatic, Non-Adjustable, made entirely of metal without moving parts or mechanical device of any kind. On a properly designed installation it should never function. It is the watchman of the water line always on guard and makes vapor heating safe because it insures a constant unvarying boiler water line by maintaining a fixed pressure differential of 10 oz. between the main steam line and the return air line of the "Vapor Heating System" when the boiler pressure is above 10 oz. No cracked boiler sections--where the Hoffman Differential Loop is used. The sectional cut clearly shows the mechanical construction of the Differential Loop. v 311