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Selection of Valve Electric Actuator Models

Selection of Valve Electric Actuator Models

Sep 26,2022

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Working Principles, Structures and Applications of Globe Valves


1. The working principle of globe valves


Globe valves are a form of forced-seal valve. The valve stem is used to raise the valve head, changing the distance between the valve disc and the valve seat to open and close the valve control. Globe valves are used in the chemical industry for a variety of cut-off class valves. Globe valves are mostly used in manufacturing for controlling water, steam, compressed air, and other pipelines, however they should not be utilized for viscosity-sensitive, easy-to-crystallize materials.


2. The design of globe valves


The structure of globe valves is more complex, but the actual operation is simple and effortless; stainless steel globe valves have a compact structure, the shape of the most obvious features, the top of the valve with a hand wheel and stem, the middle with a thread and stuffing box sealing section; stainless steel globe valves have a compact structure, the shape of the most obvious features, the top of the valve with a hand wheel and stem, the middle with a thread and stuffing box sealing section.


3. Globe valves' employ safety precautions


In order to manage the valve's operation, the height of the valve stem exposed to the bonnet is the most common technique to determine the opening and shutting state of globe valves in use. There may be gaps in the section of the valve stem that connects to the bonnet, which might lead to media leakage, which packing seals can help to prevent. Because the stem threads of tiny globe valves are placed in the valve body, they are used more often and are in touch with the medium for a longer amount of time, making them more vulnerable to medium corrosion.


The globe valves are fitted with the fluid flow direction in mind, making sure that the line fluid flows low in and high out, i.e. from the bottom up through the seat aperture. The goal of this installation is to minimize fluid resistance in the valve body, which will lower the valve opening and closing force, as well as to protect the valve stem and stuffing box from touching the medium when the valve is closed, which will reduce damage and leakage. The following precautions apply to globe valves.


(1) Before opening a globe valve, inspect it for leaks to ensure that it is free of leakage flaws and that the stuffing box is free of leakage defects.

(2) If the stem of a globe valve cannot be opened by hand, a special F-wrench can be used instead; however, if the F-wrench is still unable to open the valve, do not use an extension spanner to push the valve open and close, as this may damage the valve or result in a safety hazard.

(3) Condensate should be removed before opening stainless steel globe valves in medium pressure steam lines, and the pipeline should be warmed with steam, with the preheating pressure set between 0.2 and 0.3 MPA.


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