Page 111 - Facility Piping Systems Handbook for Industrial, Commercial, and Healthcare Facilities
P. 111
PIPING
PIPING 2.61
FIGURE 2.30 Typical needle valve.
PLUG VALVES
A plug valve, shown in Fig. 2.31, is a quarter-turn valve that uses a tapered cylindrical plug
that fits a body seat of corresponding shape. When the port in the plug is aligned with the
body opening, flow is permitted in a way similar to a ball valve. A one-quarter (90°) turn
operates the valve from opened to closed and vice versa.
FIGURE 2.31 Typical plug valve.
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