Kodiyath at 09:18, 18 January 2013

2013-01-18T09:18:26Z

← Older revision		Revision as of 03:18, 18 January 2013
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	The stem serves as a connector from the actuator to the inside of the valve and transmits this actuation force. Stems are either smooth for actuator controlled valves or threaded for manual valves. The smooth stems are surrounded by packing material to prevent leaking material from the valve. This packing is a wearable material and will have to be replaced during maintenance. With a smooth stem the ends are threaded to allow connection to the plug and the actuator. The stem must not only withstand a large amount of compression force during valve closure, but also have high tensile strength during valve opening. In addition, the stem must be very straight, or have low run out, in order to ensure good valve closure. This minimum run out also minimizes wear of the packing contained in the bonnet, which provides the seal against leakage. The stem may be provided with a shroud over the packing nut to prevent foreign bodies entering the packing material, which would accelerate wear.		The stem serves as a connector from the actuator to the inside of the valve and transmits this actuation force. Stems are either smooth for actuator controlled valves or threaded for manual valves. The smooth stems are surrounded by packing material to prevent leaking material from the valve. This packing is a wearable material and will have to be replaced during maintenance. With a smooth stem the ends are threaded to allow connection to the plug and the actuator. The stem must not only withstand a large amount of compression force during valve closure, but also have high tensile strength during valve opening. In addition, the stem must be very straight, or have low run out, in order to ensure good valve closure. This minimum run out also minimizes wear of the packing contained in the bonnet, which provides the seal against leakage. The stem may be provided with a shroud over the packing nut to prevent foreign bodies entering the packing material, which would accelerate wear.

	====Cage====		===Cage===
	The cage is part of the valve that surrounds the plug and is located inside the body of the valve. Typically, the cage is one of the greatest determiners of flow within the valve. As the plug is moved more of the openings in the cage are exposed and flow is increased and vice versa. The design and layout of the openings can have a large effect on flow of material . Cages are also used to guide the plug to the seat of the valve for a good shutoff, substituting the guiding from the bonnet.		The cage is part of the valve that surrounds the plug and is located inside the body of the valve. Typically, the cage is one of the greatest determiners of flow within the valve. As the plug is moved more of the openings in the cage are exposed and flow is increased and vice versa. The design and layout of the openings can have a large effect on flow of material . Cages are also used to guide the plug to the seat of the valve for a good shutoff, substituting the guiding from the bonnet.

Kodiyath at 09:17, 18 January 2013

2013-01-18T09:17:32Z

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 [[Category:Valves]]{{Knoppen}}
-<noinclude><!------------------------------------------------
+[[File:Globe valve.gif|thumb|right|Globe Valves]]
-* READ THIS FIRST
+[[File:Globe valve1.jpg|thumb|right|Globe Valves]]
-* Only edit this page if you can improve the content.
+'''Globe Valves''' are [[Valves]] used for regulating flow in a pipeline, consisting of a movable disk-type element and a stationary ring seat in a generally spherical body.
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+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 using a hand wheel in [[Manual Valves]]. Typically, automated globe valves use smooth stems rather than threaded and are opened and closed by an actuator assembly.
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-* Please start editing this page after the /noinclude
+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.
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+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.

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Globe Valves - Revision history

Kodiyath at 09:18, 18 January 2013

Kodiyath at 09:17, 18 January 2013

Admin: Created page with "Category:Valves{{Knoppen}}