Canadian engineer . Concrete i:i2:3 wall cols., cu. yds. at $ 195Concrete in floor inc. beams, girders and slab^, 550 cu. yds. $4-30 Foms for coumn?, 6,300 sq. ft. at 12c 756 Forms for floors, inc. beams, girders and slabs, 30,600 sq. ft., gc 2,754 Haunches, 80 sq. ft., $ 80 Steel reinforcing (cost inc. placing), 63 tons at $37 2,331 Bethlehem steel cols., 54 tons at $ 2,430 Erecting, 32 tons at $ 160 Brickwork, 20 M, at $ 360 Windows, 2,700 sq. ft. at 810 $12,616 404 THE CANADIAN ENGINEERA NEW HYDRAULIC VALVE. Volume A new type of hydraulic valve h
Canadian engineer . Concrete i:i2:3 wall cols., cu. yds. at $ 195Concrete in floor inc. beams, girders and slab^, 550 cu. yds. $4-30 Foms for coumn?, 6,300 sq. ft. at 12c 756 Forms for floors, inc. beams, girders and slabs, 30,600 sq. ft., gc 2,754 Haunches, 80 sq. ft., $ 80 Steel reinforcing (cost inc. placing), 63 tons at $37 2,331 Bethlehem steel cols., 54 tons at $ 2,430 Erecting, 32 tons at $ 160 Brickwork, 20 M, at $ 360 Windows, 2,700 sq. ft. at 810 $12,616 404 THE CANADIAN ENGINEERA NEW HYDRAULIC VALVE. Volume A new type of hydraulic valve has recently been installedin the Ontario Power Company power house at NiagaraFalls. The valve was designed and the principle patented Vmj/eV Fig. 2 illustrates a 48-inch valve of this type installedat the Ontario Power Company, Niagara Falls. Two ofthese are placed on the exciter penstocks there. Thesevalves are to be operated by electrical control from the powerhouse. They have already been placed in operation and. DETAIL op\« Fig. 1.—Section Through Valve. by Mr. R. D. Johnson, the hydraulic engineer of the powercompany. Fig. i shows the section through the valve. Thec:)mmon type of sluice valve now in use works very well forlow pressure and small dimensions. Such a valve is operatedby hand wheel or spindle fitted with appropriate larger types of gate valves under high pressures, areusually fitted with a by-pass and may be operated eitherhydraulically or by electric motors. The gate valve, how-ever, for high pressure and large diameters is very difficultto operate. Mr. Johnson designed this new type of piston valve toget over these difficulties. The operation of this valve isdue to the difference of pressures causd by the changes invelocity of the water in the valve case. The valve, it willbe noted, is composed of an enlarged and contracted sectionof pipe following each other closely. Inside the enlargedsection is placed a stationary plunger, or bobbin, wi
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