Globe Valve (Stop Valve)
A globe valve is a type of valve used for regulating flow in a pipeline, consisting of a movable
disk-type element and a stationary ring seat in a generally spherical body.
Globe valves are named for their spherical body shape with the two halves of the body being
separated by an internal baffle. This has an opening that forms a seat onto which a movable plug
can be screwed in to close (or shut) the valve. The plug is also called a disc or disk. In globe valves,
the plug is connected to a stem which is operated by screw action in manual valves. Typically,
automated valves use sliding stems. Automated globe valves have a smooth stem rather than
threaded and are opened and closed by an actuator assembly. When a globe valve is manually
operated, the stem is turned by a handwheel.
Although globe valves in the past had the spherical bodies which gave them their name, many
modern globe valves do not have much of a spherical shape. However, the term globe valve is still
often used for valves that have such an internal mechanism. In plumbing, valves with such a
mechanism are also often called stop valves since they don't have the global appearance, but the
term stop valve may refer to valves which are used to stop flow even when they have other
mechanisms or designs.
Globe valves are used for applications requiring throttling and frequent operation. For example,
globe valves or valves with a similar mechanism may be used as sampling valves, which are
normally shut except when liquid samples are being taken. Since the baffle restricts flow, they're
not recommended where full, unobstructed flow is required.
Main parameter of the globe valve
|
ANSI Globe valve |
Class 150LB-2500LB SIZE 1/2"~16" |
|
DIN Globe valve |
DN50-DN300, PN16~PN40 |
|
JIS Globe valve |
DN50-DN300 10K~40K |
|
BS Globe valve |
DN50 -DN300, PN16~PN40 |
|
Material |
WCB,LCB,WC6,WC9,C12,C5,CF8,CF3,CF3M,CF8M,A105,LF2,F11,F22,F5,F304,F316,F304L,F316L,A105,LF2,F11,F22,F5,F304,F316,F304L,F316L |
|
Design & Manufacture Std |
API600,API 6D,ASME B16.34, JISB2071, JISB2073,JISB2083, BS 1873,BS1414 |
|
Face to Face Std |
ASME B16.10,DIN 3202,BS2080, API 6D, JISB2002 |
|
End Connection Std |
ASME B16.11,ASME B1.20.1,ASME B16.5, DIN2543-2550 ,JISB2212-JISB2214 |
|
Test Standard |
ISO5208,BS 6755, API598,API 6D,JISB2003 |
|
Operated Type |
Handwheel,Bevel Gear,Pneumatic,Electric |
Materials
Typically globe valves are made of metallic alloys, although some synthetic materials are available.
These materials are chosen based on pressure, temperature, controlled media properties.
Corrosive and/or erosive process streams may require a compromise in material selection or
exotic alloys or body coatings to minimize these material interactions and extend the life of the
valve or valve trim components. Typically, carbon steel alloys are specified for noncorrosive
applications. Other alloys such as Hastelloy, Monel, Inconel and others are available.
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