GLOBE VALVES DEFINITION BASIC AND TUTORIALS


A globe valve is a multiturn valve in which closure is achieved by means of a disk or plug that seals or stops the fluid on a seat generally parallel to the line flow.



Recommended
● For throttling service or flow regulation
● For frequent operations
● For positive shutoff of gases or air
● Where some resistance to flow is acceptable

Applications
● General service, liquids, vapors, gases, corrosives, slurries

Advantages
● Efficient throttling with minimum wire drawing or disk or seat erosion
● Short disk travel and fewer turns to operate, saving time and wear on stem and bonnet
● Accurate flow control
● Available in multiports

Disadvantages
● High pressure drop
● Relatively high cost


Variations
● Standard, Y pattern, angle, three-way

Materials
● Body: bronze, all iron, cast iron, forged steel, Monel, cast steel, stainless steel, plastics
● Trim: various

Special Installation and Maintenance Instructions
● Install so pressure is under disk, except in high-temperature steam service.
● Lubricate on strict schedule.
● Flush foreign matter off seat by opening valve slightly.
● Correct packing leaks immediately by tightening the packing nut.

Ordering Specifications
● Type of end connection
● Type of disk
● Type of seat
● Type of stem assembly
● Type of bonnet assembly
● Pressure rating
● Temperature rating


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2 comments:

Anonymous said...

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