Boiler Accessories a Complete And Authoritative Treatise On the Various Access
Boiler Accessories a Complete And Authoritative Treatise On the Various Access
Tative20treatise20on20the20various20accessori
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The valve shown in Fig. 36 gets its name from the globular shape of the casing which encloses the valve. Extending across this whole casing is a substantial diaphragm, the central portion BOILER ACCESSORIES 37 of which is in a plane parallel with the length of the pipe. The open- ing is cut in this portion, horizontal in the figure, through which steam or other fluid may pass when the valve is opened. When the valve is closed, a cap is forced down to close its opening. The rim around the openin...g is known as the valve-seat. The valve-cap is operated by a spindle, which passes through the bonnet of the valve and is mounted at the upper end by a small wheel or handle. To prevent the escape of steam around this spindle, a stuffing-box is provided. The valve- cap may or may not rotate as the spindle turns; usually it does not. The valve shown in Fig. 36 is the ordi- nary globe valve known to the trade as the "Competition" valve. It is the cheapest valve of the type, and is not satisfactory where absolutely tight work is required.
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