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By R. R. Lee
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PLUG VALVE FLOW PATTERNS Figure 2-5. Lubricated plug valve. ) Instrument Valves 29 Butterfly Valves Figure 2-6 depicts two basic body styles of butterfly valves; the wafer style and the full-lug. Butterfly valves are mounted between flanges. It is the most popular throttling device. More detail on butterfly valves follows later in this chapter. __. _ _ J Figure 2-6. Butterfly valves. ) Stem Variations Figure 2-7 illustrates the various stem variations. The descriptions of the variations are important as they will appear in standard valve terminology.
3-way Fisher mixing valve with pneumatic diaphragm actuator. B. Fisher butterfly control valve, with piston operator, pneumatic positioner for throttling service. C. Fisher control valve, pneumatic diaphragm actuator. Valves for Instrument Outlets All instrument outlets for pressure measurement, vents, drains, and sampling applications require a valve that will withstand the pressure and strain of the process line. Fi~gure 2-17 illustrates a Vogt Class 800 gate valve with an extended end, which has more strength than the traditional valve and nipple concept.
Behind the control panels are thousands of feet of tubing and wire that connect the gauges to each other and often to a computer. Microprocessor-based electronics is changing that. Computers, televisions, calculators and much of the controls industry now rely on the silicon chip. The tiny integrated circuit has eliminated the need for miles of wiring, making possible smaller and more powerful computers. 2 Instrument Valves Uses for Valves Primitive man used a plug in a bamboo pipe as a valve to serve his needs.