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Advantages and disadvantages of globe valves

Mar 24, 2020

Advantages

In the process of opening and closing, because the disc friction between the valve body sealing surface is smaller than the gate valve, so wear resistance. The opening height is generally only 1/4 of the diameter of the seat channel and is therefore much smaller than the gate valve. Usually there is only one sealing surface on the valve body and disc, so the manufacturing process is better and easy to maintain. the performance of the globe valve, mainly play the role of cutting off the pipeline medium. Compared with the gate valve, the adjustment performance is better, the opening height is small, the closing time is short, the manufacture and maintenance are convenient, the sealing surface is not easy to wear, scratch, the sealing performance is better and the service life is long; the valve body structure design of the globe valve is more zigzag, so the flow resistance is large and the energy consumption is large; suitable for steam, oil and other media, not suitable for high viscosity, with particles, easy coking, easy precipitation medium. Medium and high pressure globe valve, large caliber globe valve can adopt balanced structure, the extension product of globe valve-throttle valve, by changing the cross section of the channel to control the pressure and flow rate of the medium, except for the opening and closing parts using streamline conical, most of the other are the same as the globe valve. At the opening of the globe valve, when the opening height of the disc is 25%~30% of the nominal diameter, the flow rate has reached the maximum, indicating that the valve has reached the fully open position. So the full open position of the globe valve should be determined by the stroke of the disc.

1. Structure is simple, manufacturing and maintenance is more convenient.

2. Work travel is small, opening and closing time is short. 

3.Small friction between sealing surfaces long life.


Disadvantages

1. The fluid resistance is large, the force required when opening and closing is large. 

2. Is not suitable for medium with particles, high viscosity and easy coking. 

3. Poor performance of  regulation.