KATA VALVE PLUB VALVE NPS 2"~24"
Plug valves are valves 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, sothat fluid can flow
through the plug when the valve is open. Plug valves are simple and
Plug valves are valves 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 simple and often economical.
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. 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.
he simplest and most common general type of plug valve is a 2-port
valve with two positions: open to allow flow, and shut (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 quarter-turn valve. There is often a mechanism limiting motion of the handle to a
quarter turn, but not in glass stopcocks.
Slightly conically tapered metal (often brass) plug valves are often used as simple shut-off valves in household
natural gas lines.
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 ports together. The
flow-directing possibilities in multi-port plug valves are similar
to the possibilities in corresponding multi-portball valves 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 the one side to either of
the two ports on the other side.
Stopcocks used in laboratory glassware 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 asTeflon. 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 Laboratory glassware) often with stopcock grease in between. Special glass stopcocks
are made for vacuum applications, such as in use with vacuum manifolds. 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
|Size: NPS 1/2"-24"|
|Pressure: Class 150-1500|
|Material:1/2"-2": A105,LF2,F11,F22,F5,F304,F316,F 304L ,F 316L
2"-36":WCB,LCB,WC6,WC9,C12,C5,CF8,CF3,CF 3M ,CF 8M|
|Design & Manufacture Std.: API 600,BS 1414,ASME B16.34|
|Face to Face Std.: API 6D,ASME B16.10,DIN 3202,BS2080|
|End Connection Std.: ASME B16.11,ASME B 1.20.1 ,ASME B16.5, ASME B16.47,DIN2543-2551|
|Test Standard: ISO5208,API 600,BS 6755|
|Structure Type: Rising Stem and Wedge Single Disc|
|Operated Way: Handwheel, Bevel Gear, Pneumatic, Electric|