Article Needle Valves (104db90)

A. There will be one handle wheel, as shown in figure, assembled with stem of valve and this handle wheel is used to open and close the needle valve. 2. A Z-body globe valve is illustrated in Figure 9. Butterfly valves control the flow of steam with a disk which turns on a diametrical axis inside a pipe, or by two semicircular plates hinged on a common spindle, permitting flow in only one direction.The valves are operated by a pilot medium under pressure, usually compressed air but also oil, water or steam.Describe where a globe valve would be used as compared

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