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136:(closed) to stop flow. Ports are openings in the valve body through which fluid can enter or leave. The plug in this kind of valve has one passageway going through it. The ports are typically at opposite ends of the body; therefore, the plug is rotated a fourth of a full turn to change from open to shut positions. This makes this kind of plug valve a
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or corresponding multi-port valves with a rotor. An additional possibility in plug valves is to have one port on one side of the plug valve and two ports on the other side, with two diagonal and parallel fluid pathways inside the plug. In this case, the plug can be rotated 180° to connect the port on
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When the plug is conically tapered, the stem/handle is typically attached to the larger diameter end of the plug. Plug valves usually do not have bonnets but often have the end of the plug with the handle exposed or mostly exposed to the outside. In such cases, there is usually not much of a stem.
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It is also possible for a plug valve to have more than two ports. In a 3-way plug valve, flow from one port could be directed to either the second or third port. A 3-way plug valve could also be designed to shift flow between ports 1 and 2, 2 and 3, or 1 and 3, and possibly even connect all three
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with cylindrical or conically tapered "plugs" which can be rotated inside the valve body to control flow through the valve. The plugs in plug valves have one or more hollow passageways going sideways through the plug, so that fluid can flow through the plug when the valve is open. Plug valves are
171:. The plugs can be made of a similar plastic or glass. When the plug is made of glass, the handle and plug are fused together in one piece out of glass. When glass is used for both the stopcock body and the plug, the contacting surfaces between them are special ground glass surfaces (see
183:. Stopcock grease is always used in high vacuum applications to make the stopcock air-tight. Also if the plug valve is "locked" from being in the open or closed position for an extended amount of time lubricant can be added through the greaser with the valve in service.
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The stem and handle often come in one piece, often a simple, approximately L-shaped handle attached to the end of the plug. The other end of the plug is often exposed to the outside of the valve too, but with a mechanism that retains the plug in the body.
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are typically forms of conically tapered plug valves. When fused with the glassware, the valve bodies are made of glass. Otherwise, they can be made of an inert plastic such as
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ports together. The flow-directing possibilities in multi-port plug valves are similar to the possibilities in corresponding multi-port
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140:. There is often a mechanism limiting motion of the handle to a quarter turn, but not in glass stopcocks.
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American
Petroleum Institute Standards: API 6D "Pipeline Valves"; API STD 599 "Metal Plug Valves"
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The simplest and most common general type of plug valve is a 2-port valve with two positions:
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175:) often with stopcock grease in between. Special glass stopcocks are made for
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147:) plug valves are often used as simple shut-off valves in household
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the one side to either of the two ports on the other side.
46:but its sources remain unclear because it lacks
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179:applications, such as in use with vacuum
77:Learn how and when to remove this message
143:Slightly conically tapered metal (often
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269:Nehete, Hemant (2020-04-20).
249:Plastic pressure pipe systems
109:simple and often economical.
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272:Basic Piping Engineering
120:Handwheel operated plug
32:This article includes a
61:more precise citations.
275:. Walnut Publication.
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16:Subclass of stopcocks
239:Mass flow controller
173:Laboratory glassware
165:laboratory glassware
132:to allow flow, and
163:Stopcocks used in
138:quarter-turn valve
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93:Super duplex plug
34:list of references
282:978-93-89744-69-9
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67:February 2015
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53:Please help
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234:Globe valve
204:Check valve
157:ball valves
149:natural gas
102:Plug valves
59:introducing
256:References
229:Gate valve
194:Ball valve
181:manifolds
318:Category
187:See also
151:lines.
55:improve
324:Valves
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177:vacuum
169:Teflon
106:valves
145:brass
122:valve
95:valve
40:, or
277:ISBN
134:shut
130:open
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